Electrodeposited Ni fabricated by LIGA or UV-LIGA, particularly suitable for micro-devices as a structural material. Mechanical properties of materials play an important role in micro-devices design, simulation and the actual use. In this paper, by the use of conventional mechanical testing machine and self-built micro-tensile platform, through a method of uniaxial tensile test, we measured mechanical properties of the UV-LIGA Ni thin films deposited with a current density of 20mA/cm2. The results of three test methods showed a consistent change - and Young's modulus dramatically reduced while strength significantly increased, indicating that UV-LIGA Ni has significantly different mechanical properties comparing with bulk Ni. Through X-ray diffraction spectrum analysis (XRD), we measured the preferred orientation and grain size of the specimen, by field emission scanning electron microscope (SEM), we observed the surface morphology and tensile fracture surface of the specimen, and preliminarily analyzed the causes of change in mechanical properties of UV-LIGA Ni. The test results provide an important frame of reference for the design and simulation of the micro-devices.

In view of the advantages of cellulose and its various applications, how to obtain cellulose from biomass and make it into a configuration that fits the target application scenario is of great importance. Firstly, the extraction methods of cellulose were summarized, including acid-alkali, ozonolysis, ionic liquids, deep eutectic solvents, organic solvent, and steam explosion. The pros and cons of these extraction methods were compared and analyzed. Secondly, the preparation methods of fibrous membranes were elaborated, including electrospinning, melt spinning and wet spinning. The electrospinning, a simple and cheap technique, is considered to be a commonly used method. More importantly, nanoscale fibers with high specific surface areas can be fabricated by this method and are expected to provide significant contributions to many properties and make a positive impact on the applications. In addition, these recent and excellent applications of fibrous membranes in substance separation, fabrics, photoelectricity and medicine were overviewed. Finally, the perspectives and challenges in cellulose extraction, fibrous membrane preparation and application were outlined.

Tea tree essential oil was coated with Tween 80 as surfactant to form an emulsion. Chitosan was used for the substrate and O/W chitosan-based tea tree essential oil emulsive film was prepared with cast method. Scanning electron microscopy, infrared spectroscopy, etc. were used to characterize the film’s structural feature and performance. The results showed that tea tree essential oil in chitosan solution was coated by Tween 80 to form a stable O/W emulsion casting solution. The particles of tea tree essential oil were in spherical form with a diameter of about 1μm in the film. The results of performance test indicated that the the addition of tea tree essential oil greatly enhanced antibacterial effect of chitosan film. Film had good conformability, water absorption, permeability and antibacterial property so that it is expected to be a new type of medical material in the future.

Novel aluminum-doped zinc oxide (AZO) film has excellent optical properties and low cost, and is expected to replace the mature indium-doped tin oxide (ITO) film. This paper mainly describes the structure and optoelectronic properties of AZO thin films, and focuses on the preparation processes and application fields of the thin films. Finally, the future industrialization of AZO thin films is projected.

A series of AlxGa1-xN films grown on sapphire were measured applying Spectroscopic Ellipsometry. The films thickness and optical constants in 245-1000 nm range are obtained by fitting. And Al composition is calculated by Effective-Medium-Approximation (EMA) model. With Al composition increasing, the refractive index n decreases, absorption edge shifts to shorter wavelength. The results are in good agreement with that of transmission spectrum.

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This paper developed a new type technique of material which was used to plant grass and stabilize sands in desertification region.Take the OP-10,Vomit 20 and Vomit 80 to emulsify the discard vegetable oil,which can decompose completely,then carry on a hydrophobicity-modification towards the native soil from desertification region, in the end,mix with the grass seed for making into a stabilizing sands and planting grass material based on hydrophobicity-modified soil particles.According to the analyse of humidity evaporation, planting grass in the synthetic climate box, microstructure,thermoanalysis,aperture-aperture capacity to that material, the results show it has the function of ventilation and water retention and also performs well in the test of planting grass in the synthetic climate box which can imitate surroundings of the desert。The best proportion is that the hydrophobic component is 1:20 （mL∕mL） to water and 3:20 （mL∕g） to soil.

In this thesis, the measurement results of ferromagnetic resonance of nickel iron alloy yttrium iron garnet (NiFe-YIG) granular thin films are given in order to study the mechanism of linewidth broadening in the films. The 50 nm thickness of NiFe-YIG granular thin films was prepared by RF magnetron sputtering on silicon subtrate. The out of plane angle ferromagnetic resonance was mainly measured. The linewidth was separated by combining the theories of Gilbert damping, two-magnon scattering (short-range defect excitation) and mosaic effect (long-range defect excitation). It can be found that data of linewidth and field angle are consistent with the theory. When the YIG content is low, the linewidth is mainly composed of Gilbert damping and two-magnon damping linewidth. With the increase of YIG content, the linewidth broadening effect caused by two-magnon scattering and mosaic effect increases, and the relevant basic parameters and defect information are obtained.

Cellulose has the characteristics of renewable, degradable, environmental, pollution-free, etc. Using celluloses as raw materials, the prepared cellulose-based membrane material shows excellent properties of separation, adsorption, conduction, magnetic and stimulus-response, and is widely used in separation, conduction, packaging, adsorption, and other research fields. In this paper, the application of cellulosic materials in the fields of separation film, conductive film, packaging film, and adsorption film was reviewed, and its future development trend was prospected.

Ordered porous carbon membrane materials (OPCM) were prepared by using mesoporous molecule sieves SBA-15 as template and polyimide as precursor via a combined process involving the blending, membrane-forming, pyrolysis and template removal steps. The thermal stability of precursor, functional groups on membrane surface, structural morphology and microstructure were respectively characterized by the techniques of thermogravimetric analysis, infrared spectroscopy, electron microscopy and X-ray diffraction. The microstructure and morphology of membranes before and after SBA-15 removal, as well as the gas separation performance of OPCM, were investigated. Results have shown that the gas separation factors significantly exceed the Knudsen diffusion, when the OPCM was fabricated under the condition of pyrolysis temperature of 650 ℃ and the content of SBA-15 of 1%.

A series of lithium-ion sieve precursor membrane with different amounts of spinel-type manganese oxide (Li1.6Mn1.6O4) were prepared by the phase-inversion process. The membrane was treated with HCl solution to extract lithium, resulting in the lithium-ion sieve membrane. The structure and properties of the prepared lithium-ion sieve precursor membranes were characterized by means of SEM, XRD and adsorption experiments. Adsorption experiments show that adsorption capacity of membrane-type adsorbents increase with the amount of Li1.6Mn1.6O4 from 5% up to 15%. Further increasing the amount of Li1.6Mn1.6O4, the adsorption capacity of membrane-type adsorbents decreases. It indicates that the optimal content of Li1.6Mn1.6O4 embedded into the PVDF polymer matrix is 15% with the maximums adsorption capacity of 6.98(102mg/cm2).

A novel photoresponsive SP-COOH/PAN fiber material for regulating humidity was prepared by physically doping N-carboxyspiropyran (SP-COOH) with polyacrylonitrile (PAN) and electrospinning technique. The wettability and surrounding humidity of electrospun films could be reversibly adjusted by alternating UV-visible light irradiation due to the photoisomerization of spiropyran molecule. Under UV light irradiation, spiro C-O bond would be broken and SP-COOH molecules exhibited a colored polar ring-opened status, which were easy to form electrostatic attraction with water molecules. Whereas under visible light irradiation, the spiro C-O bond reunited, presenting a colorless, non-polar ring-closed molecule that was less attracted to water molecules. Such polarity transition could reversibly manipulate the wettability of the material surface and then be applied to regulating surrounding humidity. The results show that the variation range of the wettability of the fiber material under the ultraviolet-visible alternating irradiation had a positive relationship with the range of humidity adjustment, and they both became larger as the doping amount of SP-COOH increased. When the doping amount of SP-COOH was 4%, the wettability of the material surface could only change about 3.6° and the range of humidity adjustment was about ± 2.2%. However, the wettability of the material surface could change about 16.0 ° and the range of humidity adjustment was about ± 6% when the doping amount of SP-COOH was 10%. In addition, electrospinning technology was versatile, easy-to-operate and applicable to large-scale surfaces, which was advantageous for the application of such film materials in actual life.

Proanthocyanidins (OPC) extracted from natural plants was used as free radical trapping agent and blended with polyvinyl alcohol (PVA). The PVA/OPC composite films were produced by solution casting. The thermodynamic stability of the composite films was measured by using differential scanning calorimetry (DSC) and thermogravimetric analyser (TGA). The properties of UV shielding and light transmission were investigated using double-beam UV-Vis spectrophotometer (UV-Vis). And the crystalline properties were characterized using small angle X-ray scattering (SAXS). The results show that the addition of OPC inhibited the crystallization of PVA, the thermal stability and the melt processing window of the composite films were effectively improved by adding 1.0%-2.0% OPC. And the PVA/OPC composites films exhibited excellent mechanical properties, light transmittance and UV shielding properties.

Fuel cells have potential application in the areas of transportation, stationary and distributed power generation, and portable power sources. In response to environment pollution and limited natural resources, new alternative energy conversion mode has been developed in fuel cells. However, traditional proton conducting materials, such as inorganic acid and organic molecule, generally have low temperature conductivity, high humidity dependence, ambiguously structure-property relationship. The development of fuel cell has been seriously limited because of these deficiencies. Metal-organic framework materials (MOFs) are a new kind of porous crystalline materials with many advantages such as designable structure, modifiable skeleton, large specific surface area and adjustable porosity. Owing to these excellent properties, MOFs show outstanding performance and potential application in the field of proton conduction. In this review, the research progress of high performance proton conduction of MOFs is discussed. Two conduction mechanisms as Grotthuss and Vehicle are introduced. The Grotthuss mechanism is based on the proton transferring process. Hydrogen network has been fabricated through water molecule and provides as pathway to transfer proton. Whereas, the Vehicular mechanism should be ascribed to self-diffusive transport of proton carrier molecules. According to the operating conditions, proton-conducting MOFs can be divided into two types. One works under humidity condition. Proton conduction MOFs based on oxalic acid, carboxylic acid, phosphonic and sulfonic acid have been systematically described. Several strategies can be exploited such as modifying MOFs with functional groups. The high conductivity could be obtained. The other part employs at anhydrous environment. Organic heterocyclic compounds containing nitrogen are loaded into the MOFs channel. The conductivity and work temperature could be improved through this method. Finally, the current issues of high proton conduction MOFs materials is summarized and discussed. The future development is also prospected. This review will provide reference for the design and synthesis of proton conduction MOFs materials with excellent performance.

Anti-freezing additive is a kind of admixture which has the function of removing snow and ice in the asphalt pavement instead of the mineral aggregate with different particle size in the asphalt mixture. Domestic similar products fall short of slow release performance, and generally lack of long-term effect. In order to enhance the sustained release effect of anticoagulant ice cream, in this experiment, the technology of pesticide and chemical fertilizer coating were used. The conditions of coating method, dilution ratio, particle size of large salt and curing temperature were studied, and the following conclusions were drawn: large grain salt with particle size of 4.75-9.5 mm, the dilution ratio between epoxy resin and cyclohexanone of 4∶1, epoxy resin of 30% as curing agent, and curing at 100 ℃. The solution was not add modified salt storage carrier but particle surface was coated with a layer of modified storage carrier. The anticoagulant ice agent prepared under these conditions had a good sustained release effect.

A colorless and transparent crosslinked polymer film with high elastic state is quickly prepared by polyethylene glycol 2000 diacrylate (PEGDA-2000) and N-vinyl-2-pyrrolidone (NVP) onto POSS-SH via click reaction using UV initiator. The polymer film has certain absorbability for some solvents, and its absorbability rate are calculated. Its thermal stability T_d5% reaches 300 ℃. The polymer is a hydrophobic and oil-philic film with better stability and durability in neutral and acidic environments. The critical point of oil flux of the hydrophobic and oil-philic composite press cloth appears at 17 s, at which the average oil flux before the critical point of oil-water mixture is 15 651 L/(m²·h), and the separation efficiency reaches 96%.

Water-soluble photocrosslinked poly(vinyl alcohol), N-methyl-4(4'-formylstyryl) pyridinium methosulfate acetal (SbQ-PVA) solution was coated onto silver nanowire (AgNW) films to form SbQ-PVA/AgNW composite films by a simple solution process. The optical-electrical properties and morphology of AgNW films with different surface densities before and after coating with SbQ-PVA were analyzed, and the mechanical as well as environmental stability of the AgNW films were compared with that of the SbQ-PVA/AgNW composite films. The results show that the SbQ-PVA coating does not affect the electrical conductivity of the silver nanowire network and also enhances the optical properties, resulting in a high transmittance of about 90% for composite films with sheet resistance as low as about 20 Ω/sq. Meanwhile, the mechanical stability of the SbQ-PVA/AgNW composite films is significantly enhanced, with the resistance value changing by only 1% in 5 000 bending cycle tests, and it can withstand the scratching of 3B pencil. The SbQ-PVA also brings excellent environmental stability to the composite films, which can maintain the resistance and morphology stability for 4 months in atmospheric environment, and it can also be well resisted to the corrosion of acid, alkali, and salt solutions. In addition, the SbQ-PVA/AgNW composite films are able to remain stable in deionized water ultrasonication, and this feature can be utilized with a photomask for one-step patterning of silver nanowire films. SbQ-PVA/AgNW composite films with high photovoltaic performance and stability offer new possibilities to realize high-quality flexible transparent electrodes in a simple, environmentally friendly and efficient way.

As exotic states of quantum matter, topological insulators have been widely used in the field of next-generation electronic and optoelectronic devices. Due to the co-existence of metal surface states and a narrow gap of 0.3 eV, ultrafast charge transport capability and infrared light absorption capability are both observed in Bi₂Se₃, making it a research hotpot for new optoelectronic devices. In this paper, Bi₂Se₃ thin films were electrochemically deposited on ITO substrates in an acidic electrolyte solution by the potentiostat deposition method. The growth conditions of Bi₂Se₃ thin films were determined by the control variable method as pH 0.2-0.8, deposition potential -0.15 V vs. Ag/AgCl, and deposition time 1 h. Meanwhile, the structure and morphology of Bi₂Se₃ thin films were studied by field emission transmission electron microscopy, X-ray diffractometer, and other characterization techniques. Finally, the photoresponse characteristic of Bi₂Se₃ thin films was studied, and the influence of the annealing process on its photoelectric characteristic was investigated. The test results show that the annealed Bi₂Se₃ thin film has good photoelectric performance in the near-infrared band. The responsivity and specific detectivity are about 6.3×10^-5 A/W and 2.9×10⁶ cmHz^0.5/W, respectively.

The mechanical properties of ETFE foils after aging in natural environment are the basis for long-term performance evaluation of ETFE structures. In this paper, the aging ETFE foils were selected to carry out the micro-morphology experiments and macro-mechanical tests. The standard values of mechanical parameters were analyzed based on statistical methods. The micro results show that the rough surface morphology and dense cross-section wrinkles existed and that the grain size increased by 7.8%. The breaking strength, yield stress and elastic modulus of aging ETFE foils decreased significantly. The standard values of the yield stress and elastic modulus were 11.73 MPa and 703.2 MPa, which reduced by 14.9% and 13.5%. In general, these results are critical for accurately evaluating long-term performance of ETFE structures.

Sulfonated polysulfone is a excellent material for the preparation of hydrophilic membrane. In this paper sulfonated monomers 3,3’-disulfonated- 4,4’-dichlo- rodiphenyl sulfone (SDCDPS) was firstly prepared using 4,4’-dischlorodiphenyl sulfone (DCDPS) as raw material, and the best sulphonated conditions was determined. The molar ratio of SO3/DCDPS was 3.5, reaction temperature 110 °C and reaction time 20 h. A series of different sulfonation degree of sulfonated polysulfone membrane material were synthesized via nucleophilic polycondensation reaction using SDCDPS as monomer. Its structure had been characterized by Infrared spectroscopy and nuclear magnetic resonance spectroscopy. The thermal analysis experiments showed that the polymer material had a higher molecular weight and thermal stability.

Cellulose nanocrystals (CNCs) is a natural polymer material with renewable and degradable properties. In this current study, based on the outstanding physical properties of graphene oxide (GO), CNCs-GO highly ordered layered structures are prepared by vacuum filtration method to improve the mechanical strength and hydrophobic properties of CNCs films. The experimental results show that when the mass fraction of graphene is 4%, the tensile strength of CNCs-GO layered film reaches a maximum of 204.4 MPa, which is 58.8% higher than that of the original CNCs film. The elastic modulus of layered films increases first and then decreases with the increase of GO mass fraction. The accuracy of mechanical test results is verified by analyzing the microstructure and dynamic thermo-mechanical properties of layered films. The contact angles of CNCs films and CNCs-GO layered films are measured, and it is found that the hydrophobic properties of the layered films are significantly improved due to the interaction between the hydrogen bond network of CNCs and the free hydroxyl groups on the GO surface.

Diabetes, a metabolic disease, can lead to vascular dysfunction and severe wound infection owing to the hyperglycemia in patients, which causes the wounds of diabetic patients prone to pathogenic bacterial infection, leading to the wound difficult to heal. To solve this problem, in this study, a NIR laser/glucose dual-responsive poly(lactic-co-glycolic acid) film (PLGA/Ag₂S@LM-GOx) was constructed based on Ag₂S/liquid metal compound and glucose oxidase (GOx) for efficiently eliminating pathogenic bacteria and relieve wound infection. The characterization results of XRD, SEM, EDS and BCA protein detection and analysis proved the successful preparation of Ag₂S@LM compound and PLGA/Ag₂S@LM-GOx thin films. The PL spectrum results indicated that compared with the Ag₂S, the photoexcited electron-hole pairs separation efficiency of the Ag₂S@LM compound is significantly improved. The photothermal experimental results demonstrated that PLGA/Ag₂S@LM-GOx can effectively generated heat under NIR irradiation. Subsequently, photodynamic/chemodynamic results demonstrated that PLGA/Ag₂S@LM-GOx can generate reactive oxygen species (ROS) under NIR irradiation and glucose environments by NIR laser/glucose dual-responsed, which have the potential to cause oxidative stress to bacteria. Antibacterial experiments showed that the PLGA/Ag₂S@LM-GOx film can effectively eliminate Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), proving that PLGA/Ag₂S@LM-GOx thin film possesses NIR laser/glucose dual-responsed synergistic bactericidal ability. This research not only provides a new method and experimental support for the treatment of wound infection in diabetic patients, but also provides a new idea for designing the novel thin film materials.

Supramolecular liquid crystalline polymeric complexes have been obtained by the formation of intermolecular hydrogen bonds between the benzoic acid (6OBA) and the pyridyl moieties (6SzMA). After mixing with 20 wt% crosslinking agent (C6H), polymer membranes with regularly ordered channels are obtained by in-situ photopolymerization under planar alignment condition. The polymer membrane could be applied for anhydrous proton conduction since the regularly ordered hydrogen-bonding channels are beneficial for the transportation of protons. Furthermore, the proton conductivities could be significantly enhanced by introducing H₃PO₄. The hydrogen bonds, liquid crystalline properties, microstructure and anhydrous proton conductivities of the functional membranes are characterized by FT-IR, POM, TGA, DSC, 2D-SAXS, high-resolution TEM and EIS. The results show that the formation of hydrogen bonds between 6OBA and 6SzMA molecules induces smectic phase, and the addition of the crosslinking agent has no significant effect on the liquid crystalline phase. After polymerization, the layered structure is fixed and the regularly arranged nano-scale ordered channels are obtained. The proton conduction is along the hydrogen bonding networks, achieving 7.1×10^-9 S/cm at 170 ℃ under anhydrous condition. H₃PO₄ is induced into the membrane to improve the proton conduction. 6SzMA is protonated by H₃PO₄ and new hydrogen bonding networks are formed, which facilitates the transportation of the protons. The sufficient proton source and the enhanced hydrogen bonding networks make the conductivity significantly improve by over 4 orders of magnitude, reaching 3.2 × 10^-4 S/cm at 170 ℃.

Silicon based lithium niobate (LiNbO₃) single crystal heterogeneous integrated thin films were prepared using chemical mechanical polishing. The film states at different stages of the film preparation process were studied. The surface morphology and elemental content changes of single crystal LiNbO₃ were characterized using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Large area periodic polarization of LiNbO₃ thin films was achieved using high-pressure polarization device. The results indicate that combined with the grinding progresses, the surface roughness of the sample gradually decreases. After completing the final polishing process, the root mean square roughness of the sample surface basically reaches the initial sample level, and the polishing process may lead to the loss of Li, but it can be repaired through subsequent processes. The impurity elements introduced during the grinding process will gradually be removed as the process progresses, ultimately obtaining high-quality silicon based LiNbO₃ single crystal films, and using a high-pressure polarization device to polarize LiNbO₃ thin film, a period strip domain reversal was obtained. This study is of great significance for the manufacturing of high-performance sensor components based on LiNbO₃.

Graphene, a novel two-dimensional atomic crystal consisting of a single layer of carbon atoms, has stimulated extensive studies due to its fascinating physical properties such as high transparency, high intrinsic electron mobility, large specific surface area, high thermal conductivity, supreme mechanical strength and excellent flexibility. The unique structure and excellent properties of graphene make it great potential in many fields such as strain sensor and wearable electronic devices. Graphene film, as an important form of graphene materials, can fully demonstrate the excellent properties of graphene. Anovel strain sensing film based on graphene/ polymeremulsion was prepared by spray coating method, which can be integrated with the object to be detected. The effects of spraying quantity of graphene and the thickness of emulsionon the microstructure, electrical conductivity and strain sensing properties of graphene/polymeremulsion composite films were studied.

In this paper, the first principle method based on density functional theory is used to calculate the electronic structure, magnetic moment, and charge density and differential charge density of the thin film growth system whose epitaxial relation is CoSi (001)//MgO (001). The results show that when the lattice constants a and b of CoSi crystal are set as 0 .84224 nm and C =0.28135 nm, the energy of the system is the lowest and the most stable equilibrium state is reached. It can be seen from the spin polarization band diagram, total electron state density and fractal density that the guide band bottom and valence band top of the CoSi epitaxial film overlap significantly, thus showing the gold property and producing obvious spin cracking phenomenon near the Fermi level. The valence band top is mainly composed of THE 3d⁷ state electrons of Co, while the conduction band bottom is mainly composed of the 3p state electrons of Si. At the same time, it can be seen from the state density that the phenomenon of pseudo energy gap is generated. The Co-3d state electrons not only mainly contribute to the state density, but also are speculated to be the main factor for the magnetic generation of the film. According to the calculated Mulliken charge and charge density, electrons are transferred from Si to Co, and Co ACTS as the electron acceptor, forming an anti-bonding state between Co and Si, and forming a covalent bond structure between Co and Si. The CoSi under this epitaxial relationship is ferromagnetic and the total magnetic moment is 0.52 μB.

Polyphenylene sulfide (PPS) mesh-based polysulfone (PSF)-zirconia (ZrO₂) composite separator, as a new type of high-performance alkaline water electrolysis hydrogen production separator, has the advantages of good mechanical properties, low area resistance and high chemical stability. The composite separator was prepared by preheating compression molding and phase inversion precipitation techniques. The effects of the content of PSF, ZrO₂ nanoparticles and polyvinylpyrrolidone (PVP) in the casting solution on the performance of the separator were investigated. The performance of composite separator (Named PPZS) and commercial Zirfon UTP 500 separator were analyzed and compared. The results show that the PPZS composite separator has a tensile strength of 36.36 MPa, an area resistance of 0.21 Ω·cm², and a bubble point pressure of 0.268 MPa, which exhibit excellent comprehensive performance in alkaline water electrolysis for hydrogen production.

Starch is a natural polymer material composed of α-glucose molecules with a wide range of sources, and mainly in the roots and stems of plants. It is inexpensive, renewable and biodegradable. The preparation of natural degradable plastic films from starch is of great significance to solve the problem of environmental pollution. Compared with starch-based materials, synthetic thermoplastic polymers such as polyethylene, polypropylene and polystyrene have disadvantages such as irritating odor, non-biodegradable and polluting the environment. Biodegradable thermoplastic materials made from starch have become a hot research topic for researchers. In this paper the structure and properties of starch is described, together with the plasticization methods, the ways to improve the barrier and mechanical properties of thermoplastic starch. Also the research progress and the outlook of thermoplastic starch-based materials are summarize.

A series of poly (phthalazinone ether sulfone ) containing pendant phenyl groups (PPES-P) were synthesized from 4-(3-phenyl-4-hydroxyphenyl)-2,3-phthalazin-1-one, 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one and 4,4'-dichlorodiphenyl sulfone. Sulfonated poly (phthalazinone ether sulfone) containing pendant phenyl groups (SPPES-P) were prepared from PPES-P with concentrated sulfuric acid as the sulfonating agent. The ion exchange capacity(IEC) of SPPES-P was obtained by titration method and theoretical calculation. The chemical structure of PPES-P and SPPES-P were characterized with 1H-NMR and FI-IR. SPPES-P proton exchange membranes with different IEC values were prepared. SPPES-P membranes exhibited moderate water uptake and low swelling. SPPES-P membranes showed high oxidative stability and low methanol permeability. The methanol permeability values of SPPES-P membranes ranged from 7.34×10-8 cm2?s-1 to 1.2×10-7 cm2?s-1, which were much lower than that of Nafion117 membrane (1.04×10-6 cm2?s-1) under the same test condition. The proton conductivities of SPPES-P membranes increased with the increase of IEC and temperature. The proton conductivity of SPPES-P100 membrane reached 1.4×10-2 S?cm-1 at 95 oC.

At present, the development of renewable energy has become an important part of the global sustainable energy strategy. Hydrogen is the cleanest energy in the world and is considered to be the most promising alternative energy. Industrial hydrogen production contains a large number of impurities. Therefore, the purification of hydrogen is an indispensable part of the use of hydrogen energy. Palladium and its alloy membranes are the most common materials for hydrogen separation, but they are too expensive and insufficient in yield. We need to find new hydrogen separation membranes with excellent performance. It is found that the hydrogen permeability coefficient of V/Nb and its alloy membranes is much larger than that of Pd, and the cost is lower than that of Pd metal, which is the best hydrogen separation membrane material to replace Pd metal. At present, there are many studies on V/Nb-based alloy membranes. This paper introduces the principle of hydrogen permeation of alloy membranes, the preparation methods of hydrogen separation membranes and their advantages and disadvantages, as well as the research status of V/Nb-based alloys in recent years, and looks forward to the future research and development trend of hydrogen separation membranes.

In this research, surface modification of CNC was carried out to improve the interfacial bonding between CNC and keratin. The aldehyde group was introduced into CNC by sodium periodate oxidation method. Aldehyde group was introduced into CNC to react with amino group on keratin, thus establishing crosslinking bonds between CNC and keratin. The enhanced interfacial interaction between filler and matrix resulted from chemical bonding between DCNC and keratin molecules also played an important role in improving the performance of the nanocomposites, which led to a more effective stress transfer at the interface. The drug release profiles of the obtained DCNC/keratin composites were also investigated. It was found that the pure keratin film showed a burst release of the loaded drug, which was not suitable for use as drug carrier. However, DCNC/keratin composites showed a sustained release of drug, which could be an ideal drug carrier to be used as wound healing patch.

In order to ensure the normal operation and safety at work of electronic equipment, the research on thermal management of electronic components has continued increasing in recent years. Graphite film produced with polyimide (PI) as the substrate is an important thermal conductivity material, and its thermal conductivity can be improved through doping modification. Compared with solid thermal conductive filler, ionic liquid has better compatibility with polyimide matrix, and has been commonly used in gas separation membrane, colorless polyimide (CPI) and other applications. This article used 4, 4′-diaminobenzoylanilide (DABA) and 3, 3′, 4, 4′-biphenyltetracarboxylic dianhydride (BPDA) as monomers, and modified PI films by using 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide(IL) that had the characteristic of multiple hydrogen bond sites. Then, high thermal conductivity graphite film was prepared by graphitization. The research results show that when the IL content is 5.0 wt%, the grain size of the graphite film is 78.417 nm, the degree of graphitization reaches 88%, and the thermal conductivity reaches 770 W/mK, which is 1.53 times that of the pure PI cornerstone ink film.

A perovskite solar cell absorbing layer CH₃NH₃PbI₃ thin film was prepared using a one-step spin coating method. Urea was added during the preparation of the absorbing layer, and the effect of urea doping on the phase structure and microstructure of CH₃NH₃PbI₃ thin films was studied, as well as on the photoelectric performance of perovskite solar cells assembled. The samples were characterized by XRD, SEM, UV-Vis, PL and J-V curves. The results showed that the addition of appropriate amount of urea increased the crystallinity of CH₃NH₃PbI₃ film, improved its orientation and coverage, and reduced the number of pores and cracks. When the doping amount of urea was 10 mol%, the grain size of the film was the most uniform and the crystallization performance was the best. All CH₃NH₃PbI₃ thin films have absorption edges around 780 nm and a bandgap width of 1.5 eV. The addition of appropriate amount of urea improved the absorbance and emission peak intensity of CH₃NH₃PbI₃ film. With the increase of urea doping amount, the absorbance and emission peak intensity of CH₃NH₃PbI₃ film first increased and then decreased. When the doping amount of urea was 10 mol%, the absorption property of CH₃NH₃PbI₃ film was the best, and the emission peak intensity was the highest. 30 perovskite solar cells were assembled using CH₃NH₃PbI₃ thin films with different levels of urea doping, and the J-V curves were tested. When the doping amount of urea was 10 mol%, the cell had the best photoelectric performance, and its solar-cell efficiency reached the maximum of 20.61%. The above analysis shows that the optimal doping amount of urea is 10 mol%.

Using carboxymethyl cellulose sodium and polyethylene glycol as raw materials, a porous network structure was formed through cross-linking and gel, and a pH responsive gel membrane was prepared. The sample obtained antibacterial properties by soaked in tannic acid solution, and the microstructure, swelling properties, in vitro drug release, antioxidant properties, and antibacterial properties of the antibacterial membrane were characterized. The results show that the prepared antibacterial membrane has a good porous structure. The carboxyl group on carboxymethyl cellulose sodium endows the antibacterial membrane with certain pH responsiveness, which makes it exhibit anisotropic swelling and drug release in vitro at different pH values. After drug loading, the antioxidant capacity of the sample increases to 91.33%, and the antibacterial rate against Escherichia coli and Staphylococcus aureus reaches more than 90%. This antibacterial film has great application prospects in drug sustained-release dressings and other fields.

A novel thermo-induced self-healing polyurethane film material was developed. Polyethylene glycol (PEG-600) and tolylene 2,4-diisocyanate (TDI) were employed to construct the polymer main chain, and 2-furanmethanamine (FMA) and N,N’-(4,4’-methylenediphenyl) dimaleimide (BMI) were used to introduce the Diels-Alder (DA) bonds into the polymer as pedant groups. The film showed satisfactory transparency at 550 nm (transmittance 82.0% with 0.47 mm thickness). Crack on the film surface can be completely healed in 5 min at 120 ℃. And 84.7% of its original mechanical strength can be recovered.

To measure the heat flow signal of the high temperature aeronautics and astronautics irregular surface, a flexible atomic layer thermopile heat flow sensor was proposed. MgO thin films with inclined texture were grown by inclined substrate deposition technique, and thermoelectric YBa₂Cu₃O_7-δ thin films were successfully epitaxial grown by metal-organic chemical vapor deposition technique. Its thermoelectric performance was tested by pulsed laser, and the response time reached 196 ns.

With the advantages of negative electron affinity energy, high thermal conductivity and extreme chemical inertness, diamond thin films have attracted much attention as field emission materials. This paper reviewed the classification of diamond films, introduced the negative electron affinity properties of hydrogenated diamond films, analyzed the factors affecting the field emission characteristics of diamond films, listed the optimization direction of field emission characteristics, and summarized the performance of field emission cathode obtained by diamond films combined with other materials reported in the literature. It is of great significance to analyze and improve field emission performance of diamond thin film devices.

When polymer materials contact with blood, thrombus is formed on the surface of the material, and the requirements of anticoagulation cannot be met. Heparin or heparin-like substances can be immobilized on the polymer materials by appropriate methods to improve the antithrombogenicity of the materials. In this paper, the methods for improving the blood compatibility of polymer materials were summarized, and the characteristics and strengths of heparinized/heparin-like polymer membrane materials were described. The paper focused on the introduction of the research progress of the heparinized/heparin-like anticoagulant polymer membrane materials on its preparation and production methods, and the further research direction of heparin-like polymer membrane materials was prospected.

The plasma electrolytic oxidation coatings (PEO coatings) with corrosion protection and insulation properties were prepared on copper alloy by aluminate electrolyte system. The microstructure and structural composition of the PEO coatings were characterized by scanning electron microscope (SEM), X-ray energy dispersive spectrometer (EDS) and X-ray diffrotometer (XRD). The corrosion protection of the PEO coatings were evaluated by electrochemical and salt spray corrosion test. The leakage current and voltage of the PEO coatings under AC and DC conditions were measured by puncture tester. The results show the PEO coatings on copper alloy surface tends to grow outward in form of electrolyte deposition. As the oxidation voltage increased, more of the copper alloys were oxidized, and the PEO coatings was thicker. The corrosion current density decreased by 3 orders of magnitude compared with copper substrate, and no obvious corrosion products were found after 732 h neutral salt spray test. The breakdown voltage in DC and AC modes were increased to 750V and 600V respectively. The PEO coatings prepared in high voltage had higher growth rate and showed excellent corrosion resistance and insulation performance.

The separator is a crucial component in lithium batteries. Commercially available polyolefin separators often suffer from poor electrolyte wettability and high-temperature shrinkage, which limits their suitability for the development of high-performance lithium batteries. In this study, a cellulose/polyacrylamide (d-CA/PAM) composite separator was prepared by in situ polymerization of acrylamide in a cellulose acetate (CA) solution, followed by synchronous phase separation and deacetylation. The d-CA/PAM separator exhibits high porosity (77.9%), excellent electrolyte uptake (273.0%), outstanding thermal stability (no shrinkage at 200 ℃), and a high ionic conductivity (1.51 mS/cm). The lithium metal batteries assembled with the d-CA/PAM separator demonstrate superior performance compared to polyolefin separators, showing a higher initial capacity (150.1 mAh/g vs. 143.0 mAh/g) and better cycling stability (capacity retention after 100 cycles 94.3% vs. 92.0%).