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  • Focuses & Concerns (The Project of Chongqing Press Fund in 2021)
    GAO Yunhe, LI Ke, LIU Huang, ZHOU Chengshang
    Jorunal of Functional Materials. 2022, 53(6): 6006-6013.
    Metal hydride hydrogen compression technology has the advantages of good safety, no moving parts, and the ability to use low-grade waste heat. However, this technology has high requirements for the hydrogen sorption plateau pressure, plateau slope, hysteresis of hydrogen storage alloys. In this paper, the influence of the addition of alloying elements on the hydrogen compression properties of BCC structure vanadium-based alloys is studied. The V75Ti20M5 (M=V, Ti, Cr or Zr) hydrogen compression alloys were prepared by the arc melting method, using volume adsorption method to determinate the PCT curve and kinetic properties, and the plateau slope, hysteresis effect, hydrogen compression ratio and hydrogen reaction rate of the alloy PCT curve were obtained by calculation to compare the hydrogen compression properties of alloys. The results show that the reversible hydrogen storage capacity of V75Ti20Cr5 alloy is 1.05 wt%. Compared with V75Ti25 alloy, the hydrogen compression rate is significantly improved, and V75Ti20Zr5 significantly reduces the reversible hydrogen storage, hydrogen compression ratio and hydrogen compression rate of the alloy.
  • Focuses & Concerns (The Project of Chongqing Press Fund in 2021)
    WANG Cong, WANG Weiqiang, DONG Xufeng, QI Min
    Jorunal of Functional Materials. 2022, 53(6): 6014-6018.
    Micro arc oxidation of metals and alloys (MAO) involves the interaction between electrolyte and alloy surface at high plasma temperature. In this process, the formation of porous layer on alloy surface is not only closely related to electrolyte composition, but also plays an important role in coating structure and electrical properties. In this paper, MAO of binary Ti Al alloys with different Al content is carried out by adding 0.15 M KOH and 0.1 M Na2B4O7 electrolyte The effect of alloy composition on coating structure in micro arc oxidation process was investigated. Scanning electron microscope (SEM) and 3D laser confocal microscope analyzed the morphology and oxide accumulation thickness of the coating, and contact angle tester measured the hydrophilic properties of MAO coating. The results showed that with the increase of matrix Al content, the MAO process was more intense, which would promote the uniform formation of the coating, increase the hole size, oxide accumulation and voltage value. The coatings show good hydrophilicity, and the increase of Al content makes the coating more uniform, resulting in better hydrophilicity.
  • Research & Development
    LI Guanda, WANG Bo, XIE Hui, WANG Xi, GE Xiyun
    Journal of Functional Materials. 2022, 53(5): 5104-5111.
    Light-aggregate porous concrete can be applied to traffic noise control because of its light weight, porosity and good weather resistance. This experiment developed a new light-aggregate porous concrete using fly-ash cenospheres, namely solid wastes from thermal power plants, as aggregate and cement as cementitious material. It could be applied to the sound absorption material of the road noise barrier. Impacts of two factors, namely molding pressure and aggregate-to-cement ratio, on the acoustic performance were investigated through experimental characterization. Horoshenkov & Swift model was also used to inverse calculate the tortuosity and flow resistance of the material to investigate the effect of molding conditions on them. The results show that with the increase of pressure, the first peak frequency of sound absorption of the specimen shifts to low frequency and the absorption coefficient at the peak decreases. With the rise of aggregate-to-cement ratio, the peak frequency of sound absorption shifts to high frequency, and the absorption coefficient at the peak increases. The calculation results of the inverse computation show that the fitting degree R2>0.8, which is credible. Under the condition of 0.9 aggregate-to-cement ratio, the forming pressure is positively correlated with the tortuosity and flow resistance. While under the forming pressure of 0.2 MPa, the aggregate-to-cement ratio is negatively correlated with the curvature factor.
  • Focuses & Concerns(The Project of Chongqing Press Fund in 2021)
    LU Huiying, SUN Qiaoyang, GAO Xinyu, WEN Tianpeng, XU Jingxiao, LIU Tao
    Jorunal of Functional Materials. 2022, 53(7): 7001-7005.
    Using ZrO2, MgO and trace TiO2 as raw materials, MgO partially stabilized ZrO2 solid electrolyte (MgO-PSZ) was synthesized by a solid-state method. XRD, SEM, densification, electrical properties and thermal shock resistance of the synthetic samples were analyzed to investigate the influence of TiO2 doping content on their properties. The results show that when the TiO2 content is 0.4 mol%, the densification reaches 95.13%. The content of tetragonal phase and cubic phase in the samples first increases and then decreases with the increase of TiO2 content, up to about 48%. When the TiO2 doping content is 0.2 mol%, the ionic conductivity of the sample reaches the maximum, and the conductivity was 4.71×10-3 S/cm at 950 ℃. When the TiO2 content is 0.4 mol%, the maximum residual strength after thermal shock resistance is 1400 MPa.
  • Focuses & Concerns(The Project of Chongqing Press Fund in 2021)
    FANG Wenhang, QI Pengfei, XU Yan, LI Ning, QIU Biwei
    Jorunal of Functional Materials. 2022, 53(9): 9001-9007.
    Based on ionic bond and covalent bond double crosslinking, using NBR as matrix and DCP as initiator, a hybrid cross-linked NBR with high performance and repair efficiency was prepared by blending AMPS and different contents of ZnO or CuO. The effects of content and types for metal oxide on the structure and properties of crosslinked NBR were investigated. The results show that the sulfonic groups on AMPS form ionic bonds with metal ions, and DCP leads to covalent crosslinking of NBR. With the increase of metal oxide content, the crosslinking density increases and tensile strength of hybrid crosslinking NBR increases nearly 4 times. The ionic bond with lower bond energy breaks preferentially and dissipates energy, which increases the elongation at break nearly 3 times. The activation energy of ionic bond formed by copper ion and sulfonic group is greater than that of zinc ion, so it is more effective to improve the toughness of rubber. The reversibility of ionic bond endows rubber with self-healing ability, and the longer the waiting time, the higher the self-healing efficiency.
  • Focuses & Concerns (The Project of Chongqing Press Fund in 2021)
    YU Pengfei, WANG Jian, LEI Ming
    Jorunal of Functional Materials. 2022, 53(8): 8001-8008.
    Photocatalysis is considered as an ideal wastewater treatment technology because it can directly use solar energy, degrade almost all organic pollutants, reduce heavy metal ions and mild reaction conditions. On the basis of solvothermal synthesis of graphene/C3N4, noble metal Pt was loaded on the surface of C3N4 at lower temperature using water as the reducing agents, and Pt/graphene/C3N4 composite photocatalysts with 0D-2D-2D structure was obtained. The structure of Pt/graphene/C3N4 was analyzed by XRD, TEM, BET, XPS, Raman and PL technologies, and their photocatalytic performance for the degradation of RhB and the reduction of Cr(Ⅵ) under visible light irradiation were evaluated. The synergistic effect of Pt and graphene can not only promote the separation and transmission of the photogenerated charges and increase the specific surface area, but also maximize the utilization of Pt atoms and enhance its catalytic performance. Therefore, Pt/graphene/C3N4 composites showed excellent photocatalytic performance. Among all composites, Pt0.5/G3/C3N4 with the loading of 0.5wt% Pt and 3wt% graphene exhibited optimum photocatalytic performance. The degradation rate for RhB with an initial concentration of 40 μmol/L achieved 97% after 60 min reaction. The corresponding apparent first-order reaction rate was 0.0562 /min, which was 12.5 and 3.2 times higher than that of C3N4 and G3/C3N4. Meanwhile, Cr(Ⅵ) with an initial concentration of 20 mg/L can be reduced by 94% after 80 min reaction. The corresponding apparent first-order reaction rate was 0.0119 /min, which was 14.7 and 2.4 times higher than that of C3N4 and G3/C3N4.
  • Review & Advance
    LI Lingbo, LIU Chenhui, MA Zhiyu, SHI Ying, DING Xu, LI Yalun, LI Yiyao
    Jorunal of Functional Materials. 2022, 53(8): 8059-8066.
    As a new and efficient heating preparation technology, microwave has been widely used in the field of material preparation due to its advantages of cleanness, high efficiency, low energy consumption, high yield and good selectivity. TiO2 has attracted great attention in the degradation of pollutants in the environment due to its high catalytic activity, non-toxicity and stable chemical and physical properties. The application of microwave heating technology in the preparation of TiO2 photocatalyst can reduce the heat treatment time, the cost, and effectively the agglomeration of TiO2 materials, resulting in more uniform products. In this paper, five preparation methods of TiO2 photocatalyst assisted by microwave in recent years, microwave hydrothermal method, microwave sol-gel method, microwave liquid phase deposition method, microwave drying method, and microwave microemulsion method were reviewed, and as well as its application in photocatalytic degradation of organic pollutants. The purpose is to provide reference for promoting the application and development of microwave heating technology in the field of TiO2 photocatalyst.
  • Review & Advance
    FAN Jingyi, MA Xun, LI Wei, LIU Ping, WANG Jingjing, WANG Haibin, LU Xuhua
    Jorunal of Functional Materials. 2022, 53(7): 7027-7039.
    Titanium alloys were widely used in the biomedical field due to its suitable elastic modulus, high strength, good corrosion resistance and other characteristics. However, titanium alloys have poor wear resistance, fatigue resistance, biocompatibility, and antibacterial properties, which have a great impact on the service life of the device and the success rate of implants. Therefore, this study mainly introduces the surface modification technology to improve the wear resistance, fatigue resistance, biocompatibility and antibacterial properties of titanium alloys, and look forward to its possible future development directions.
  • Jorunal of Functional Materials. 2022, 53(8): 0.
  • Review & Advance
    YANG Yuanlin, LI Ying, CHEN Lijia, NIU Lianbin
    Jorunal of Functional Materials. 2022, 53(7): 7040-7057.
    Organic-inorganic hybrid perovskite solar cells (PSCs) have rapidly emerged following the silicon-based solar cell. At present, photoelectric conversion efficiency (PCE) of PSCs has reached 25.5%, which is considered to be the promising new type solar cell. The top electrode is an important part of PSCs .This paper mainly expounds the research progress of top electrode materials for PSCs, and summarizes the interface regulation and modification treatment of metal electrode and carbon electrode. The advantages and challenges of metal and carbon for top elelctrode and the application of the top electrode materials in low manufacturing cost and long-term stability of perovskite solar cells were proposed.
  • Focuses & Concerns(The Project of Chongqing Press Fund in 2021)
    CHEN Yizhao, LIU Cunsheng, CHENG Weixiang, LI Yuezhu, HUANG Xingwen, CUI Shuaifu, LIU Haohua, SHU Xugang, LIAO Songyi, MIN Yonggang
    Jorunal of Functional Materials. 2022, 53(9): 9025-9034.
    MXene (Ti3C2Tx) is a new two-dimensional transition metal carbide/nitride discovered in 2011. It has attracted much attention in the field of battery in recent years because of its unique graphene-like layered structure, good metal conductivity, excellent hydrophilicity and adjustable layer spacing. This paper mainly summarizes the relatively mature synthesis strategies and preparation methods of MXene (Ti3C2Tx) and its composites, and prospects the application research progress of Ti3C2Tx composites in the field of batteries, hoping to provide scientific and theoretical reference for the preparation of high-performance MXene electrode materials and their application in ion batteries.
  • Focuses & Concerns (The Project of Chongqing Press Fund in 2021)
    GUO Binglin, GAO Yihao, LI Yongyue, MI Changhua, LYU Xiaojun, LI Meicheng
    Jorunal of Functional Materials. 2022, 53(10): 10001-10007.
    The integrated photovoltaic-storage device can convert solar energy into chemical energy for direct storage to achieve the direct use of solar energy. Improving the total energy conversion efficiency is a major research focus. A low internal resistance composite material that is in-situ grown nickel hydroxide nanosheets on reduced graphene oxide (rGO) was prepared for the cathode of supercapacitor and the integrated photovoltaic-storage device was assembled. The discharge specific capacitance of the composite electrode is 1586.4 F/g at 2 A/g and even 1108 F/g at 50 A/g, and the retention rate is as high as 70.0%. The discharge specific capacitance of the nickel hydroxide electrode is 622.8 F/g at 2 A/g and even 304 F/g at 50 A/g, and the retention rate is 48.8%. In addition, the coulombic efficiency of composite electrode is 96.5%, while that of nickel hydroxide electrode is only 48.4% at 2 A/g. Compared with the nickel hydroxide, the composite material has a larger electrode electrolyte interface, which is conducive to the rapid exchange of electrons and protons at the interface. Meanwhile, the electrons can be exported quickly in the charging-discharging process by rGO in electrode, which reduces the internal resistance of the device. The total energy conversion efficiency of 14.21% was obtained by using composite materials in integrated photovoltaic-storage device. It is expected to provide a new direction for the design of energy storage materials for the integrated photovoltaic-storage device.
  • Jorunal of Functional Materials. 2022, 53(6): 0.
  • Review & Advance
    LUO Yanrong, LU Chunlan, YANG Dongxu, ZHANG Xiaolin
    Jorunal of Functional Materials. 2022, 53(8): 8054-8058.
    In recent years, hydrogels, a common polymer material, have been widely used in biomedicine, especially in tissue regeneration and drug delivery because of their unique three-dimensional structure, good biocompatibility, biodegradability and non-toxic properties. Hydrogel is a kind of cross-linked network material formed by swelling of hydrophilic polymers after water expansion. It has high water content, elasticity, softness, mechanical strength and porosity, and is suitable for loading drugs and cells. Polysaccharides are nontoxic, biocompatible, and exhibit many unique physicochemical properties. They are used in hydrogel drug delivery systems. Based on 5 kinds of common natural polymer materials, this paper introduces the research progress of polysaccharide hydrogels at home and abroad. The preparation methods, properties and clinical applications were reviewed, in order to provide a basis for future research on biomimetic hydrogels with complete performance and widely used in clinical treatment.
  • Review & Advance
    LIU Gaoshang, LIU Chengbao, CHEN Feng, QIAN Junchao, QIU Yongbin, MENG Xianrong, CHEN Zhigang
    Jorunal of Functional Materials. 2022, 53(8): 8078-8084.
    With the interconnection of all things realizing, the demand amount for green, sustainable and high stability energy storage materials is increasing. Biomass-derived carbon has attracted more attention due to its rich pore structure, large specific surface area, environmental friendliness and considerable economic value. In this paper, the structure and synthesis methods of biomass-derived carbon were introduced, and the research status of biomass-derived carbon electrode materials was summarized. The new development trend and new challenges of biomass-derived carbon electrode materials were put forward, which provided ideas for future rational design of biomass-derived carbon energy storage materials.
  • Jorunal of Functional Materials. 2022, 53(7): 0.
  • Review & Advance
    FU Yutian, LI Hui, LIANG Jinglong, ZHANG Sheng, LI Haotian
    Jorunal of Functional Materials. 2022, 53(9): 9073-9079.
    This paper presents the classification of different soft magnetic materials, and briefly introduces their related properties and application fields. On this basis, the different preparation methods of iron-based soft magnetic materials are summarized, and the main research methods for improving soft magnetic properties are briefly profiled. Finally, the characteristics of different process technologies are briefly generalized and prospects are made.
  • Review & Advance
    ZHANG Gaozhan, WANG Yuxuan, YANG Jun, ZHANG Jian, KOU Bin, DING Qingjun
    Jorunal of Functional Materials. 2022, 53(8): 8036-8044.
    Chloride ion erosion is one of the main reasons for shortening the service life of concrete in marine and saline environment. Aggregate, as the largest raw material in concrete in volume proportion, is the main factor affecting the transport of chloride ion in concrete. In order to meet the demands of environmental protection and sustainable development, artificial lightweight aggregate and recycled aggregate have been widely used in concrete structures. Owing to the porous nature of lightweight aggregate and the complex interfacial transition zone of recycled aggregate, the chloride transport behavior in concrete prepared with these aggregates is obviously differ from those made with traditional aggregate. Therefore, it is particularly important to study the influence of aggregate on the transport behavior of chloride ions in concrete. This paper reviews the influence of aggregate on the chloride ion transport behavior, and summarizes the influence mechanisms of aggregate on the chloride ion transport t macro- and meso-scale. Finally, the existing problems in the current research were analyzed and the research prospects on chloride ion transport were presented.
  • Focuses & Concerns (The Project of Chongqing Press Fund in 2021)
    LIU Xiangjun, YANG Changqiao, REN Huiping, YANG Jichun, JIN Zili
    Jorunal of Functional Materials. 2022, 53(8): 8024-8030.
    In view of the current research status that the experimental methods to study the effect of solute rare earth on the mechanical properties of steel has not achieved satisfactory results, in this paper, a system research was carried out by means of simulation calculation, and first-principles calculation method based on density functional theory was used to reveal the solid solution mechanism of Ce atoms in α-Fe by solvation energy, geometric structure, electronic structure, and Bader charge. And the mechanical properties of Fe-Ce doped system were calculated in detail. The calculation results of the solvation energy show that Ce can occupy the α-Fe matrix by replacing Fe atoms. In Fe-Ce doped system, Ce atoms lose electrons, resulting in a reduction in the radius of Ce atoms and a polarization effect, which is conducive to the solid solution of Ce in Fe. The calculation results of the mechanical properties of pure Fe and Fe-Ce doped system show that Ce doping reduces the incompressibility, shear strain resistance, rigidity, and Vickers hardness of the system, but improves the toughness and workability of the system. Ce doping leads to a decrease in the strength of the metallic bond of the system, which is the main reason for the decrease in the incompressibility, rigidity and hardness of Fe-Ce doped system. On the other hand, the doping of Ce increases the density of the electron cloud in the system, which is conducive to the improvement of the toughness of the doped system.
  • Focuses & Concerns (The Project of Chongqing Press Fund in 2021)
    ZHANG Yubin, BAO Shihui, ZHANG Cong
    Jorunal of Functional Materials. 2022, 53(8): 8031-8035.
    The adsorption function of pervious concrete for heavy metal ions in water has received increasing attention, but the lack of its own mechanical properties and low adsorption efficiency are the main bottlenecks that limit its mechanical and environmental functions in a wider range of use scenarios. In this paper, GO ultra-high performance pervious concrete was prepared by introducing graphene oxide (GO), and its adsorption performance on divalent lead ions (Pb2+) in aqueous solution was investigated. It was found that GO ultra-high performance pervious concrete was able to have more than 95% removal rate of Pb2+ from the solution while ensuring excellent mechanical properties and permeability. The solution pH has a significant effect on the adsorption performance of GO ultra-high performance pervious concrete, and its adsorption effect is the best when pH=4. The adsorption of GO ultra-high performance pervious concrete was found to increase with the increase of Pb2+ concentration in the solution, but the adsorption rate showed a trend of increasing firstly and then decreasing, and the adsorption rate reached the peak when the initial concentration of Pb2+ was 50 mg/L. The parameter fitting analysis revealed that the adsorption process of GO ultra-high performance pervious concrete on Pb2+ in solution was more consistent with the Freundlich model, and the Freundlich model could be used to describe the adsorption isotherm of GO ultra-high performance pervious concrete on Pb2+.
  • Research & Development
    HAN Ying, ZHENG Bohan, ZHONG Zhiiyong
    Jorunal of Functional Materials. 2022, 53(6): 6130-6136.
    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.
  • Jorunal of Functional Materials. 2022, 53(9): 0.
  • Focuses & Concerns(The Project of Chongqing Press Fund in 2021)
    HE Yan, WANG Youqiang, MO Jun, ZHAO Tao, ZHU Yuling, LI Mengjie
    Jorunal of Functional Materials. 2022, 53(7): 7013-7018.
    Fe3O4 nanoparticles were prepared by chemical co-precipitation method, and the particles were surface treated with citric acid and oleic acid. Through field transmission electron microscope, Fourier infrared spectrometer, UV-visible spectrophotometer test and four-ball friction and wear tester, the size and morphology, surface functional groups, dispersion stability and tribological properties of modified nanoparticles were evaluated respectively. Scanning electron microscope and optical microscope were used to analyze the morphology of wear scars. The modified nanoparticles are spherical and contain a small amount of square particles. Among them, the average particle size of the citric acid modified particles is (9.6±0.19)nm, and the average particle size of the particles modified by citric acid and oleic acid is 9.8±0.16 nm. The infrared spectrum shows that the active agent is successfully coated on the surface of the particles. The absorbance of the magnetic fluid does not change much within 30 hours and tends to be stable, with good dispersion stability. Under a certain concentration of magnetic fluid lubrication, it exhibits excellent anti-friction and anti-wear properties. Among them, 0.3% magnetic fluid has the best anti-friction and anti-wear performance. The friction coefficient is reduced by 22.68%, and the wear scar diameter is reduced by up to 13.7%. Through the synergy of the formation of adsorption film, deposition repair, micro-bearing and micro-cutting, a certain concentration of magnetic fluid can effectively improve the anti-wear and anti-wear properties of glycerin, and the type of surfactant has an impact on the friction performance of glycerin-based magnetic fluid.
  • Review & Advance
    LIANG Ying, QU Junhao, ZHANG Miao, ZHOU Peng, LI Wangnan, LIANG Guijie
    Journal of Functional Materials. 2022, 53(4): 4075-4087.
    Recently, nickel oxide (NiOx) has been using as a promissing hole transport layer (HTL) in perovskite solar cells (PSCs), due to its low cost, high hole mobility, good chemical stability and low- temperature processability. And the trans perovskite solar cells prepared by NiOx HTL are showing great market application prospects. The preparation and optimization of NiOx HTL are critical to the performance of the photovoltaic devices. Therefore, in this paper, the preparation process and research progress of NiOx thin films in PSCs are systematically introduced. Then the effects of post-treatment methods such as O2-plasma, ultraviolet, and surface passivation on the defect state, surface chemical state and material work function of NiOx thin films are emphatically analyzed. The progress of doping (like transition metal, alkali metal, rare earth element doping and element co-doping) on the optical and electrical properties of NiOx thin films and the optoelectronic properties of devices are summarized in detail. Furthermore, the future development directions of NiOx-based PSCs are prospected.
  • Review & Advance
    ZHAN Danya, YU Qiongfen, LI Ming, FAN Jie, CHEN Jie, LI Yinning, LI Aimin, ZHU Rong, WANG Yunfeng
    Jorunal of Functional Materials. 2022, 53(9): 9061-9072.
    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.
  • Review & Advance
    TANG Ting, ZHANG Weili, GAO Ning, WEN Yi, LI Sulan, LI Youbing
    Jorunal of Functional Materials. 2022, 53(9): 9035-9041.
    As a new material, phase change energy storage materials have irreplaceable advantages and application value in building energy conservation and ecological sustainability. The commonly used solid and liquid phase change materials, due to the problem of easy leakage of solid and liquid phase change materials to a certain extent, restrict the development and application of phase change composites. Aiming at the low temperature solid liquid phase change material encapsulation technology, this paper introduces the low temperature phase change latent heat storage material and its phase transformation in packaging technology research status quo. The porous mineral adsorption phase change material, such as diatomite, expanded vermiculite and expanded perlite, and porous carbon based phase change composites based on expanded graphite were given priority to, as well as the preparation of aerogel phase change composite material technology. The load capacity, thermal performance and thermal conductivity of phase change composites are introduced. On this basis, the future research direction of solid and liquid phase variable composites is proposed, in order to provide some reference for the application and promotion of solid and liquid phase variable composites.
  • Research & Development
    HAO Xinli, ZHAO Jingzhe, LI Linyi, CHANG Shuoshuo, LI Lufeng
    Jorunal of Functional Materials. 2022, 53(9): 9115-9121.
    Rhodamine B is an important dye pollutant that needs to be removed. Researchers have been interested in developing and implementing various nanomaterials to degrade Rhodamine B from water. Birnessite-MnO2 nanomaterial with a two dimensional layered structure has been widely used in degrading rhodamine B. In this paper, birnessite-MnO2 nanoflowers were synthesized by self-decomposition reaction of potassium permanganate in 90 ℃ under acidic condition. The as-prepared samples were characterized by X-ray powder diffraction and field emission scanning electron microscopy. Sodium oleate was added to synthesize the samples with different size and the mechanism is also discussed. As the amount of sodium oleat increasing, the size of the sample obtained was smaller. The size of the as-prepared samples ranged from 50 to 800 nm. The degradation Rhodamine B property of the samples obtained was discussed. The samples synthesized were used to degrade Rhodamine B in acidic condition without light source added. The size of the sample and pH value were discussed to evaluate degradation property of the birnessite-MnO2 nanoflower. The results show that the smaller the sample size, the better the degradation performance. When pH value was below 4, the birnessite-MnO2 nanoflower had the best degradation property, and the degradation rate of Rhodamine B could reach 92.4%. After five cycles of degradation, the RhB degradation was above 85%.