化学镀银在复合粉体中的应用及研究进展

介绍了复合粉体化学镀银的原理和特点。分析了粉体的类型、粉体的预处理工艺、化学镀液成分及操作条件如温度、pH等因素对化学镀银的影响。综述了镀银粉体在导电填料、吸波材料和电子元件方面的应用和研究现状,并提出了粉体化学镀银目前存在的问题和未来的发展趋势。     

铁路客车上水消毒工艺探析

结合铁路客车上水的特点，比较分析了当前常用的几种消毒工艺的优缺点，并指出臭氧、紫外线、载银树脂消毒工艺在未来的铁路客车上水消毒中有很大的应用市场。进一步阐述了各消毒工艺的设备及特点。     

环氧乙烷银催化剂研究现状及技术进展

介绍了环氧乙烷银催化剂技术研究现状,从催化剂载体、制备工艺等方面概述了我国环氧乙烷银催化剂技术研究进展,指出其今后的发展建议.     

无银明胶全息干版制备技术

简要介绍了无银明胶全息干版的成像机理、工艺设计及底层实验技术，提出了该产品在图像制备阶段的基本工艺。     

淀粉降解还原分离锰银氧化矿工艺研究

研究了淀粉降解预处理还原分离锰银氧化矿工艺原理及主要影响因素,当以vMn:vH2SO4:v(C6H10O5)n:vH2O=1:1.8 b:16.66 a:30配料时,锰浸出率达95.93%,银的浸出损失率＜2%;浸锰渣采用氰化法提银,1 t渣用氰化钠1 kg、浸出时间3 h时,银浸出率94.15%;浸锰-氰化两步浸出银的回收率大于92.27%,锰与银被有效分离;分离工艺具有免焙烧、原矿适用面广、淀粉用量少、分离成本低等特点,具有较好的实际应用价值.     

电子工业用银包铜粉的制备现状及其应用

综述了制备银包铜粉各种方法的制备工艺及银包铜粉性能的研究现状,这些方法包括置换法、化学还原法、置换与化学沉积复合法及熔融雾化法。介绍了铜粉的预处理方法。列出了某单位采用置换与化学沉积复合技术制备的7种不同银含量的片状银包铜粉的技术指标。指出了银包铜粉的用途及其应用前景。     

富平银沟遗址部分陶瓷碗类的造型规格及装饰制作

以传统陶瓷工艺技术的研究成果,结合长期的陶瓷艺术设计、实际制作和现行的技艺规则及生活习尚,对银沟遗址出土陶瓷标本中部分特征较强的碗类器物在时代判断、制作工艺、造型装饰、规格使用等方面的成因加以分析研究。从而得出了这部分陶瓷的烧制技术特点、装饰艺术及美学风格及它在整个中国陶瓷史上的作用和地位。     

无氰电沉积银技术探究

文章概述了无氰电沉积银技术的发展历史和研究现状,通过对现有无氰电沉积银体系的介绍,指出了无氰镀银工艺的前景及研究方向。     

载银树脂制备过程中银的行为的研究

主要研究了载银树脂的制备工艺及静态吸附过程中银的行为。本文通过静态吸附实验,对载银树脂制备过程中引入添加剂锌或铜条件下的工艺条件,吸附性能,反应动力学、热力学进行了探讨。分阶段进行吸附工艺:选用001×7树脂作为载体,温度为25℃,溶液浓度为0.020 mol/L,吸附至平衡;选用锌或铜为添加剂,换取吸附溶液,通过对时间、温度及添加剂浓度的影响,分析银吸附及解吸行为,并为选择较佳的工艺条件和参数做理论基础。     

铜基无氰电刷镀银研究

探讨了铜基无氰电刷镀银的基本原理和施镀工艺。详细介绍了电刷镀银设备、特点、应用以及手工除油、化学除油、电净、活化、浸银、刷镀银液的配制等前处理,防银变色处理、电解钝化、镀层性能检验、退镀、补镀、注意事项等后处理工艺。     

Controlled Layer-by-Layer Formation of Ultrathin Oxide Films on Silver Island Films for Surface-Enhanced Raman Scattering Measurement

Methods for the controlled deposition of ultrathin metal oxide layers onto silver island films for surface-enhanced Raman scattering (SERS) measurements are reported. Two related deposition techniques are explored for thin film growth: a surface sol-gel method and atomic layer deposition. Both methods exhibit excellent control of the deposited film thickness to atomic level precision while conformally coating the complex structures found in silver island films. Coating of metal oxide films onto silver substrates provides a method for monitoring the distance dependence of SERS enhancements and offers a platform for exploring adsorption and interaction of analytes on dielectric surfaces. Analysis of the distance dependence of the Raman signal with increasing film thickness yields estimated silver particle sizes that are in agreement with microscopy, which is consistent with the layer-by-layer growth mechanism of uniform metal oxide films on the silver substrate. These methods can be easily extended to grow a variety of laminar or mixed metal oxide films for the exploration of interfacial phenomena.     

Preparation and characterization of silver nanocomposite textile

Nanostructured silver films of different thicknesses were deposited on surfaces of polypropylene nonwovens by magnetron sputter coating to obtain antibacterial and electrical conductive properties. The surface morphology of nanostructured silver films was investigated by atomic force microscopy (AFM). The antibacterial properties of the nonwovens coated with relatively thinner films were evaluated using the shake flask test. The conductivity of the nonwovens coated with relatively thicker films was examined using an ohm-meter. The results of the antibacterial test revealed that the antibacterial performance improved gradually as the film thickness increased from 0.5 to 3 nm. It is believed that the total amount of silver ions released from the coating was increased along with the increase in film thickness. As sputtering time prolonged, the grain sizes of the silver particles were increased and the coating became more compact. The results of the electrical conductivity test showed that the increased film thickness led to the improved electrical conductivity when the film was relatively thicker. The AFM images clearly revealed the change in surface morphology formed by sputter coating. The growth and coverage of the coating layer contributed to the improvement in its antibacterial and conductive properties.     

Electroless silver deposition on Si(100) substrate based on the seed layer of silver itself

A new method for silver electroless deposition on Si(100) wafer, based on the silver itself as the seed layer, was developed. The seed layer was first deposited onto the etched wafer surface in an acidic solution of 0.005 mol l⁻¹ AgNO₃+0.06 mol l⁻¹ HF. Then the silver thin film was electrolessly deposited upon the seed layer in the electroless bath of AgNO₃+NH₃+acetic acid+NH₂NH₂ (pH 10.2). The NH₂NH₂ was taken as the reducing agent. The morphology of the seed layer and the silver film were characterized by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray analysis (EDX). The experimental results indicated that the seed layer showed excellent catalytic function for silver electroless deposition.     

Enhanced cycleability of LiMn2O4 cathodes by atomic layer deposition of nanosized-thin Al2O3 coatings

This report is the first effort to use atomic layer deposition method for deposition of nanosized-thin and highly conformal Al(2)O(3) coatings onto LiMn(2)O(4) cathodes with precise thickness-control at atomic scale. The coated cathodes exhibit significantly enhanced cycleability than bare cathodes, as the dense ALD coating protects the cathode material from severe dissolution.     

Application of Conducting Polymer Layer for Measurement of Ag Nanoparticle Concentration Using Surface Plasmon Resonance

An application of polypyrrole and polypyrrole–chitosan were presented to measure the concentration of silver ion and silver nanoparticles using surface plasmon resonance sensor. These results were compared to those for atomic absorption spectroscopy method. The sensing layers were prepared using an electrodeposition on gold layer with the sensor limitation at about 1mg/L, and well correlated to prior atomic absorption spectroscopy results. The sensor with a polypyrrole-chitosan layer was more sensitive and accurate than the sensor with just a polypyrrole layer.     

Mechanical and antimicrobial properties of multilayer films with a polyethylene/silver nanocomposite layer

A layer of a polyethylene–silver nanoparticles composite was deposited on a five layer barrier film structure. Different methods were used for the nanocomposite layer deposition: laminating, casting, and spraying over the multilayer structure. For the casting and spraying methods, the silver nanoparticles were previously dispersed in the polymer solution, with the assistance of ultrasound energy. The effect of silver nanoparticles and deposition method on the barrier, mechanical, and optical properties of the multilayer films was evaluated. The efficiency of silver ion release from the PE‐Silver nanocomposite deposited on the multilayer films and their antimicrobial characteristics were investigated and discussed. The silver ion release and biocide effect of the multilayer films was found to be dependant on the silver nanoparticle content and on the deposition method used. The observed results could be helpful in the design of industrial films for packaging. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Surface Modification of Titania Nanoparticles Using Ultrathin Ceramic Films

Surface modification of titania nanoparticles was achieved by coating them with ultrathin alumina films using atomic layer deposition. The coating process was performed in a fluidized bed reactor at low pressure and under mechanical vibration. Films were deposited using self-limiting, sequential surface reactions of trimethylaluminum and water. The composition of alumina-coated particles was verified using infrared spectroscopy. The deposited films had an average growth rate of 0.2 nm/coating cycle and were highly uniform and conformal as demonstrated by transmission electron microscopy and X-ray spectroscopy. Deposited alumina films were amorphous as verified through X-ray diffraction and high-resolution electron microscopy. The coating process did not promote particle sintering as validated via particle size and surface area analysis.     

Surface Engineering Strategies to Enhance the In Situ Performance of Medical Devices Including Atomic Scale Engineering

Decades of intense scientific research investigations clearly suggest that only a subset of a large number of metals, ceramics, polymers, composites, and nanomaterials are suitable as biomaterials for a growing number of biomedical devices and biomedical uses. However, biomaterials are prone to microbial infection due to Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), Staphylococcus epidermidis (S. epidermidis), hepatitis, tuberculosis, human immunodeficiency virus (HIV), and many more. Hence, a range of surface engineering strategies are devised in order to achieve desired biocompatibility and antimicrobial performance in situ. Surface engineering strategies are a group of techniques that alter or modify the surface properties of the material in order to obtain a product with desired functionalities. There are two categories of surface engineering methods: conventional surface engineering methods (such as coating, bioactive coating, plasma spray coating, hydrothermal, lithography, shot peening, and electrophoretic deposition) and emerging surface engineering methods (laser treatment, robot laser treatment, electrospinning, electrospray, additive manufacturing, and radio frequency magnetron sputtering technique). Atomic-scale engineering, such as chemical vapor deposition, atomic layer etching, plasma immersion ion deposition, and atomic layer deposition, is a subsection of emerging technology that has demonstrated improved control and flexibility at finer length scales than compared to the conventional methods. With the advancements in technologies and the demand for even better control of biomaterial surfaces, research efforts in recent years are aimed at the atomic scale and molecular scale while incorporating functional agents in order to elicit optimal in situ performance. The functional agents include synthetic materials (monolithic ZnO, quaternary ammonium salts, silver nano-clusters, titanium dioxide, and graphene) and natural materials (chitosan, totarol, botanical extracts, and nisin). This review highlights the various strategies of surface engineering of biomaterial including their functional mechanism, applications, and shortcomings. Additionally, this review article emphasizes atomic scale engineering of biomaterials for fabricating antimicrobial biomaterials and explores their challenges.     

金刚石微粉表面镀覆技术研究进展

金刚石微粉表面镀覆能够提高其热稳定性、增强其对金属的润湿性和改善表面物理性能,对金刚石微粉的性能提高具有重要意义。综述了适用于金刚石微粉表面镀覆技术的化学镀、溶胶凝胶镀及原子层沉积镀等方法,总结了每种方法的原理、优缺点及研究进展,最后对金刚石微粉表面镀覆进行了展望。     

Layer‐by‐layer modification of porous polybenzoxazine with silver nanoparticles for enhanced CO2 storage

Polybenzoxazine (PBZ) xerogels have been synthesized via quasi solventless method and coated with silver nanoparticles using the layer‐by‐layer (LbL) deposition method. After coating, the samples were carbonized at 800 °C to obtain high surface area porous carbon materials to be used for CO₂ storage. Evidences of the successful LbL deposition of the coating was provided by ultraviolet–visible and attenuated total reflection–Fourier transform infrared spectroscopy and the silver nanoparticles top layer was confirmed by scanning electron microscopy–energy‐dispersive X‐ray spectroscopy, transmission electron microscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy. Results showed that the samples coated with silver nanoparticles displayed an increased CO₂ capacity from 3.02 to 3.39 mmol g^?1 when compared with the plain carbon PBZ. The LbL method for the modification of the pore surface in porous PBZ is simple and allows the facile tuning of the inner PBZ pore's surface chemistry with metallic nanoparticles that could be enhanced CO₂ storage capacity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45097.