环氧基聚合物分散液晶膜的制备及其性能研究

采用聚合相分离方法制备环氧树脂基PDLC膜.通过对液晶含量、固化温度和时间等条件进行优化,研究上述条件对PDLC膜性能的影响;使用UV-Vis、AFM、SEM等方法对聚合物的物理特性和PDLC膜的光电性质做了深入探讨.PDLC膜在传感器、光电开关、光栅以及新型分析仪器元器件等方面具有广阔的应用前景.     

Recent progress in the synthesis,characterization and photocatalytic application of energy conversion over single metal atoms decorated graphitic carbon nitride

Single-atom catalysts have attracted much attention because of their exceptional high activity, eminent atomic utilization, and good selectivity, exhibiting diverse performance in a wide range of energy conversion. However, with the decrease in particle size and sudden increase of surface energy, ultra-small particles may gather together to form nanoclusters and cannot maintain atomic scattering. Protecting catalytic sites requires normalizing and controlling the interaction between single atoms and substrates. Graphitic carbon-nitride, g-C₃N_4, with a unique two-dimensional (2D) structural unit and excellent stability, exhibits a controllable electronic structure that capable to be a support for the atomically dispersed metal atoms. Mainly, g-C₃N₄ contains many nitrogen atoms that are periodically detached and can attribute energetic positions for efficient constituents, primarily for single atoms. This review article introduced the synthetic approaches of single metal atoms (SMA) anchored g-C₃N₄, including synchronization atmosphere, electronic structures of SMA, and the latest characterizations towards their physiochemical applications. Solar energy conversion, including water splitting for H₂-production and CO₂-reduction using SMAs anchored g-C₃N₄, and the role of SMA in catalytic mechanism over the SMA modified g-C₃N₄ were discussed, along with the challenges and opportunities for further research into high-efficiency SMA-modified g-C₃N₄ photocatalysts. This review is estimated to explain the essentials and massive potential of SMAs anchored g-C₃N₄.     

低速常压逆转乳化法制备阳离子分散松香胶

以低速常压逆转乳化法制备了阳离子分散松香胶,对乳化剂的选择和用量、乳化温度、转相温度、搅拌速度、加料速度和稳定剂等进行了研究,测定了松香胶的粒径和电荷,并探讨了阳离子分散松香胶对纸浆Zeta电位的影响.     

In situ synthesis of highly dispersed VO2(M) nanoparticles on glass surface for energy efficient smart windows

Thermochromic VO₂-based smart windows are considered as a highly promising building envelope to reduce building energy consumption. However, the inherent unsatisfactory optical performance hindered its practical applications and nanocomposite films are testified to be the most promising strategy addressing this issue, while uniformly dispersing nanoparticles is often a challenge. Herein, a facile in situ method was proposed to directly fabricate highly dispersed VO₂ nanoparticles (HD-VN) on a glass surface from the VOC₂O₄·xH₂O aqueous solution to achieve the high-optical performance VO₂ film (HD-VN film). The forming mechanism of HD-VN was fully elucidated and HD-VN was generated via the sintering process from the irregular VO₂ particles derived from the decomposition of polyvinyl pyrrolidone (PVP). The HD-VN film showed excellent luminous transmittance (T_lum) of 72.5% and solar energy modulation efficiency (ΔT_sol) of 10.1%, the former was attributed to the reduced refractive index which led to a reduced reflectance of HD-VN film, and the latter was ascribed to the localized surface plasmon resonance (LSPR) behavior of the HD-VN. The simple and cost-efficient synthesis strategy would promote the application of VO₂ film in energy-efficient glazing, and also shed light on the structures’ design applied to the field of optics, catalysts, and sensors.     

Microstructure Design Strategy for Molecularly Dispersed Cobalt Phthalocyanine and Efficient Mass Transport in CO2 Electroreduction

Cobalt phthalocyanine (CoPc) has attracted particular interest owing to its excellent activity during the electrochemical CO₂ conversion to CO. However, the efficient utilization of CoPc at industrially relevant current densities is still a challenge owing to its nonconductive property, agglomeration, and unfavorable conductive substrate design. Here, a microstructure design strategy for dispersing CoPc molecules on a carbon substrate for efficient CO₂ transport during CO₂ electrolysis is proposed and demonstrated. The highly dispersed CoPc is loaded on a macroporous hollow nanocarbon sheet to act as the catalyst (CoPc/CS). The unique interconnected and macroporous structure of the carbon sheet forms a large specific surface area to anchor CoPc with high dispersion and simultaneously boosts the mass transport of reactants in the catalyst layer, significantly improving the electrochemical performance. By employing a zero-gap flow cell, the designed catalyst can mediate CO₂ to CO with a high full-cell energy efficiency of 57% at 200 mA cm⁻².