纳米TiO2表面无机/有机复合改性研究

用液相沉积法对纳米TiO2进行了表面无机/有机复合改性.用XRD、FT-IR进行了包覆膜结构表征,用TEM观察改性后颗粒的形态.测量了有机包覆量对改性样品亲油性的影响.结果表明,液相沉积并经105℃烘干得到的Al2O3膜为非晶态结构,煅烧后才能晶化;有机膜可以在无机膜上生成,其最大包覆量约为7%,且与包覆温度无关;复合包覆后纳米颗粒外形不变,分散性提高;有机包覆量对纳米TiO2的亲油性有非线性影响,包覆量为1.2%时其亲油性最好.     

高速气流冲击法制备陶瓷-金属复合粉体

为了改善陶瓷粉体的分散性差、易团聚等缺点,同时赋予陶瓷颗粒新的表面特性,形成满足特定需求的陶瓷复合粉体,对比分析近几十年来广泛应用的粉体颗粒表面包覆改性技术,包括物理气相沉积包覆法、化学气相沉积包覆法、液相化学法、机械改性法等,重点对高速气流冲击改性的设备和原理进行详细论述,指出高速气流冲击改性技术在制备核-壳型复合颗粒时具有成本低、工艺简单、包覆膜致密均匀、对环境危害小等优点,更加适合于制备陶瓷-金属复合粉体。     

纳米氧化锌表面包覆改性及其表征

采用液相沉积法对纳米氧化锌进行表面包覆SiO2和SiO2/Al2O3改性,并用XRD、TEM、TG-DSC对其表面结构进行了表征,借助Zeta电位测定仪、静态沉降实验等分析手段考察了改性前后纳米氧化锌在水体系中的分散稳定性.结果表明,在ZnO表面形成的包覆物是以非晶态形式存在的,通过表面包覆SiO2和SiO2/Al2O3改性后明显提高了氧化锌的表面羟基含量,有效改变了氧化锌的等电点,显著提高了纳米氧化锌在水中的分散稳定性.     

纳米颗粒包覆方法的研究进展及其应用

综述了近年来国内外对纳米颗粒进行表面改性所采用的包覆方法,包括固相法和沉淀法、溶胶-凝胶法、化学镀法、聚合物包裹法等液相化学法。主要从包覆机理、表征方法、包覆方法及应用进行综述,指出了这些包覆方法的技术关键及优缺点,重点介绍了溶胶-凝胶包覆方法及其应用。并展望了包覆技术的发展前景。     

高岭土/钛白复合粉体的制备与表征

借助粉体表面改性的原理及液相化学沉积的包覆工艺,以高岭士为核,利用四氯化钛水解在其表面包覆－层纳米二氧化钛制成高岭土复合钛白,并用TEM、XRD等手段进行了表征。结果表明：复合粉体包覆效果良好800℃煅烧后包覆层二氧化钛主要为锐钛矿型结构,并开始向金红石型转化。     

纳米陶瓷微粒表面改性研究进展

介绍了纳米陶瓷微粒表面改性的常用方法,包括表面活性剂改性法、包覆改性法、酯化反应法、偶联剂法、表面接枝改性法等,以及这些改性方法的适用范围和改性工艺,指出了纳米陶瓷微粒表面改性的意义和应用前景.     

日本材料表面改质改性技术现状：—赴日技术考察报告

本文介绍了日本材料表面改质改性技术现状,该技术的分类、用途及各种工艺方法,如热喷涂、化学气相沉积、物理气相沉积、接合法、表面合金化、溅射法、气相法、液相法、离子注入法等。     

铁基软磁复合材料的SiO2包覆研究进展

软磁复合材料在诸多领域有着重要的应用，随着技术的发展，对软磁复合材料的性能要求也在不断提高中。为了满足在高频率和高功率工况下的应用需求，需要开发低损耗、高磁导率的软磁复合材料。SiO₂作为绝缘包覆介质具有高电阻率和高热稳定性，能够通过多种方法包覆在磁粉颗粒上，因此在新型软磁复合材料开发领域得到广泛的应用。总结了溶胶凝胶法、化学液相沉积法、反相微乳法、化学气相沉积法、双层包覆法和改性树脂包覆法在铁基软磁复合材料的SiO₂绝缘包覆上的应用，归纳了上述各绝缘包覆方法的特点，并按其特点进行了分类，指出了当前SiO₂绝缘包覆面临的一些问题，并对未来绝缘包覆方法的发展进行了展望。     

超细粉体表面包覆技术研究进展

表面包覆技术可以有效解决超细粉体稳定性低及分散性差等缺点,并通过复合赋予其新的物理、化学等特殊功能。本文以固相包覆法、液相包覆法、气相包覆法分别较详细论述了当前超细粉体表面包覆技术的研究进展,并对常用的表面包覆方法进行了介绍。     

粉体包覆技术的研究进展

随着新材料研究的快速发展,对超细粉体提出了更高的要求,表面改性可以给超细粉体带来许多新的特性,其中粉体的包覆技术就是表面改性技术之一.综述了粉体包覆技术的包覆机理,对粉体的包覆技术通过固相、液相和气相进行分类,并概述了每大类的主要技术及其机理和应用.     

铝粉的表面改性

铝粉的表面改性是功能铝粉生产中非常重要的工艺。本文中综合铝粉改性的手段及改性后铝粉的功能,介绍了铝粉表面改性常用的几种方法,包括机械化学改性、氧化改性、表面化学改性、胶囊改性、包覆改性和沉淀改性等。     

Surface Modification on Biodegradable Magnesium Alloys as Orthopedic Implant Materials to Improve the Bio-adaptability:A Review

Magnesium(Mg) and its alloys as a novel kind of biodegradable material have attracted much fundamental research and valuable exploration to develop its clinical application. Mg alloys degrade too fast at the early stage after implantation, thus commonly leading to some problems such as osteolysis, early fast mechanical loss, hydric bubble aggregation, gap formation between the implants and the tissue. Surface modification is one of the effective methods to control the degradation property of Mg alloys to adapt to the need of organism. Some coatings with bioactive elements have been developed, especially for the micro-arc oxidation coating, which has high adhesion strength and can be added with Ca, P, and Sr elements. Chemical deposition coating including bio-mimetic deposition coating, electro-deposition coating and chemical conversion coating can provide good anticorrosion property as well as better bioactivity with higher Ca and P content in the coating. From the biodegradation study, it can be seen that surface coating protected the Mg alloys at the early stage providing the Mg alloy substrate with lower degradation rate. The biocompatibility study showed that the surface modification could provide the cell and tissue stable and weak alkaline surface micro-environment adapting to the cell adhesion and tissue growth.The surface modification also decreased the mechanical loss at the early stage adapting to the loadbearing requirement at this stage. From the interface strength between Mg alloys implants and the surrounding tissue study, it can be seen that the surface modification improved the bio-adhesion of Mg alloys with the surrounding tissue, which is believed to be contributed to the tissue adaptability of the surface modification. Therefore, the surface modification adapts the biodegradable magnesium alloys to the need of biodegradation, biocompatibility and mechanical loss property. For the different clinical application, different surface modification methods can be provided to adapt to the clinical requirements for the Mg alloy implants.     

等离子喷涂-物理气相沉积Si/莫来石/Yb2SiO5环境障涂层

采用等离子喷涂-物理气相沉积技术(PS-PVD)在SiC/SiC复合材料表面依次制备了Si(底层)、3Al₂O₃-2SiO₂ (中间层)、Yb₂SiO₅(面层)环境障涂层(EBC)。利用扫描电子显微镜(SEM)观察分析EBC涂层表面与界面的微观形貌, X射线衍射仪对喷涂过程中易非晶化的莫来石涂层进行物相分析, 研究了喷涂粉末与高温等离子体的相互作用并探讨了EBC涂层的沉积机制。结果表明：通过PS-PVD技术可制备出低孔隙率、高致密界面的EBC涂层。通过观察EBC涂层表面, Si涂层表面无裂纹, 而莫来石和Yb₂SiO₅涂层表面均发现有微裂纹, 其中莫来石涂层表面的裂纹尺度大于Yb₂SiO₅涂层。三层结构的致密EBC涂层以液相沉积为主, 同时伴随有气、固沉积。在Yb₂SiO₅涂层沉积过程中, 液相沉积导致涂层为致密的层状结构, 蒸发后气相在等离子焰流中及基体表面发生均匀形核和非均匀形核导致涂层中出现大量的纳米晶粒, 而微熔粒子和溅射粒子则形成涂层中亚微米、微米晶粒。     

碳纳米管表面包覆方法的研究进展

在碳纳米管表面包覆纳米级功能层已成为近年来改善碳纳米管性能的重要研究方向。文章综述了碳纳米管表面包覆的四种常用方法：化学镀法、原位液相合成法、气相沉积法和碳热还原法,简要分析了这四种方法的工艺特征及适用范围,并对下一步的研究方向进行了展望。     

硅灰石表面无机改性及其在聚丙烯中的应用

采用非均匀成核法,通过在硅灰石表面包覆硅酸铝对硅灰石进行了无机改性。扫描电镜（SEM）和X射线衍射（XRD）等测试表明,无机改性硅灰石颗粒表面粗糙,包覆着许多纳米硅酸铝粒子;通过BET比表面积分析仪测定,比表面积提高200%以上;红外光谱（FT-IR）测试表明,无机改性后硅灰石表面羟基增多;白度测试表明,无机改性硅灰石...     

SOME PRINCIPLES FOR UNDERSTANDING SURFACE MODIFICATION OF METALS BY GLOW DISCHARGE PROCESSES

An overview of the new technologies available for surface modification is presented with an emphasis on metals. Basic principles of various processes such as chemical and physical vapor deposition are described and the role of cold plasma in these techniques is outlined. Plasma species and reactions in the plasma are discussed in view of their importance in the coating process. Plasma carburizing, nitriding and bonding are described, as well as other plasma assisted methods for deposition of protective coatings- sputtering, reactive evaporation and ion-plating.     

Fabrication of discontinuous surface patterns within microfluidic channels using photodefinable vapor-based polymer coatings

In this report, we introduce a surface modification method for the fabrication of discontinuous surface patterns within microfluidic systems. The method is based on chemical vapor deposition (CVD) of a photodefinable coating, poly(4-benzoyl-p-xylylene-co-p-xylylene), onto the luminal surface of a microfluidic device followed by a photopatterning step to initiate spatially controlled surface binding. During photopatterning, light-reactive groups of the CVD polymer spontaneously react with molecules adjunct to the surface, such as poly(ethylene oxide). We demonstrate the potential of these reactive polymers for surface modification by preventing nonspecific protein adsorption on different substrates including silicon and poly(dimethylsiloxane) as measured by fluorescence microscopy. More importantly, three-dimensional patterns have successfully been created within polymer-based microfluidic channels, establishing spatially controlled, bioinert surfaces. The herein reported surface modification method addresses a critical challenge with respect to surface engineering of microfluidic devices, namely, the fabrication of discontinuous patterns within microchannels.     

低温沉积陶瓷涂层技术的研究进展

对当前低温沉积陶瓷涂层的技术进行了综述,包括液相沉积法、溶胶-凝胶法等,并分析了各种低温沉积技术的优缺点,展望了低温沉积技术的发展前景.     

One‐Step Assembly of a Biomimetic Biopolymer Coating for Particle Surface Engineering

Advances in material design and applications are highly dependent on the development of particle surface engineering strategies. However, few universal methods can functionalize particles of different compositions, sizes, shapes, and structures. The amyloid‐like lysozyme assembly‐mediated surface functionalization of inorganic, polymeric or metal micro/nanoparticles in a unique amyloid‐like phase‐transition buffer containing lysozyme are described. The rapid formation of a robust nanoscale phase‐transitioned lysozyme (PTL) coating on the particle surfaces presents strong interfacial binding to resist mechanical and chemical peeling under harsh conditions and versatile surface functional groups to support various sequential surface chemical derivatizations, such as radical living graft polymerization, the electroless deposition of metals, biomineralization, and the facile synthesis of Janus particles and metal/protein capsules. Being distinct from other methods, the preparation of this pure protein coating under biocompatible conditions (e.g., neutral pH and nontoxic reagents) provides a reliable opportunity to directly modify living cell surfaces without affecting their biological activity. The PTL coating arms yeasts with a functional shell to protect their adhered body against foreign enzymatic digestion. The PTL coating further supports the surface immobilization of living yeasts for heterogeneous microbial reactions and the sequential surface chemical derivatization of the cell surfaces, e.g., radical living graft polymerization.