Fe_3O_4的制备及表面修饰

Fe_3O_4磁性纳米粒子由于其具有较高的磁性、良好的生物相容性、较低的毒性及简单的制备条件等优点,成为应用最为广泛的一种磁性纳米材料。文章主要介绍了Fe_3O_4磁性纳米粒子的主要合成方法,及利用无机材料、有机小分子材料和高分子材料对Fe_3O_4磁性纳米粒子的修饰方法。     

聚合物基复合介电材料

聚合物基复合介电材料是介电材料的一种,是指以有机聚合物为基体,将具有高介电常数或易极化的微纳米尺寸的无机颗粒或其它有机物作为填充物复合而成,还兼备聚合物的粘结性、韧性、易加工性,在多领域具有广泛应用。其研究与应用的关键是材料合成路线的设计与性能的有机结合,聚合物基体与表面修饰无机颗粒界面的良好作用,使其具有优良的介电特性。本文介绍了几种类型的聚合物基复合介电材料的填料颗粒,概述了各种类型的聚合物基复合介电材料的研究状况并展望了未来的发展趋势。     

磁性纳米颗粒表面功能化修饰及其在污水处理中的应用进展

磁性纳米颗粒具有高比表面积、高表面能和高磁响应等特性，其作为磁性吸附剂载体在污水处理中有着巨大的应用潜力，但目前的制备工艺及成本尚难以达到污水处理工业化应用要求。在总结磁性纳米吸附材料改性方法的基础上，综述了功能化磁性纳米颗粒在去除含重金属、有机污染物、无机污染物等污水中的应用研究进展，并对未来的磁性纳米吸附材料研究方向提出了若干建议。     

磁性Fe3O4@SiO2@N3多层纳米复合粒子的制备

采用部分还原法制备Fe_3O_4磁性纳米颗粒(MNP),通过反相微乳液法在磁性Fe_3O_4纳米颗粒表面包覆SiO_2且其表面由叠氮(-N3)基团进行修饰,制备了一种新Fe_3O_4@SiO_2@N3复合材料。TEM和IR对材料形态结构及包覆情况的分析,显示SiO_2包覆在Fe_3O_4表面,形成尺寸约为50 nm,硅球结构清晰较为均匀,单分散性好的复合结构。其与3-叠氮丙基三乙氧基硅烷接枝叠氮基团,形成尺寸为70 nm左右的三层复合结构。该复合材料具有良好的分散性,可作为合成磁性纳米应用材料的中间体。     

聚合物磁性纳米微球的研究综述

聚合物磁性纳米微球不仅具有无机的磁性,又兼具有机表面的可修饰性,是一种很有前途的载体材料。本文对聚合物磁性纳米微球近年来在生化分离、催化、医学、环境等领域的应用进行了综述,并对其未来的研究进行了展望。     

无机炭黑（粉煤灰）在橡胶中的应用研究

<正>无机炭黑是以优质电厂粉煤灰为基础材料,以改性高分子材料为成核剂,并通过碱性偶联剂、酸性偶联剂、复合偶联剂对微珠进行表面改性、微细化处理、离子分离、表面修饰、喷雾干燥处理等多种工艺复合而成,为半合成、微纳米级硅铝氧化物粉末状材料或干法造粒的小颗粒材料。无机炭黑呈多孔蜂窝状圆球体     

Fe_3O_4磁性纳米颗粒表面功能化改性及在油气田开发领域中的应用

对国内外Fe_3O_4磁性纳米颗粒的表面改性方法及其油气田开发领域应用现状进行了系统调研,按照其表面功能化改性材料划分为无机材料改性、有机小分子材料改性、有机高分子材料改性。功能化改性后Fe_3O_4磁性纳米颗粒在油气田开发领域中应用时包括在提高采收率、污水处理、石油机械保护等方面,具有良好的应用前景。并对其在油气田开发领域应用发展进行了展望,指出开发出具备特异性功能的磁性纳米颗粒,进一步改善其表面性质、负载功能基团的吸附量和稳定性,降低生产成本是该领域的主要研究方向。     

精氨酸修饰的磁性纳米基因载体的研究

采用多层修饰方法制备出精氨酸修饰的磁性纳米基因载体,对样品进行了粒度分析、Zeta电位分析、耐酸性能、生物相容性、体外细胞转染性能研究。结果显示,精氨酸修饰的磁性纳米颗粒均匀,分散性好,大多呈圆球型,平均粒径为15 nm,粒径范围10~20 nm,其Zeta电位为+29.3 mV;多层修饰的纳米磁粒在pH 2.0的酸中具有很好的耐酸性能,而未处理的纳米粒子在酸溶液中发生了溶解。MTT实验结果显示,纳米颗粒与细胞有良好的生物相容性;体外细胞转染的结果表明,精氨酸修饰的纳米磁粒能介导pEGFP-N1质粒转染HepG2细胞,并在细胞中表达绿色荧光蛋白。因此,精氨酸修饰的磁性纳米颗粒作为一种新型非病毒基因载体具有介导核酸类生物大分子的应用价值。     

磁性氧化铁纳米颗粒的研究进展

磁性纳米颗粒是一种多功能性材料,在医学、催化和磁记录材料等领域有着广泛的应用。本文综述了磁性氧化铁纳米颗粒的制备方法,包括共沉淀法、热分解法、微乳液法、水热合成法;改性途径,包括表面活性剂改性、有机聚合物包覆,和硅、碳、金等无机材料包覆的研究现状和最新研究成果,并对其以后的发展方向进行了展望。     

磁性高分子复合微球的研究进展

磁性高分子复合微球是粒径在纳米级至微米级,通过适当方法使有机高分子与无机磁性物质复合起来形成的具有一定磁性及特殊结构的微球。磁性高分子复合微球兼具高分子材料的功能特性和无机纳米粒子的磁响应性,可以在外加磁场作用下快速方便的分离。因此,磁性高分子微球作为一种新型的复合功能材料,在生物化学、靶向药物、化学工业、分离工程、水处理等诸多领域显示出了广泛的应用前景。本论文主要综述了磁性高分子复合微球的制备方法和应用领域,并对前景和存在的问题进行了分析和展望。     

Preparation of Magnetic Carbon Nanotubes (Mag-CNTs) for Biomedical and Biotechnological Applications

Carbon nanotubes (CNTs) have been widely studied for their potential applications in many fields from nanotechnology to biomedicine. The preparation of magnetic CNTs (Mag-CNTs) opens new avenues in nanobiotechnology and biomedical applications as a consequence of their multiple properties embedded within the same moiety. Several preparation techniques have been developed during the last few years to obtain magnetic CNTs: grafting or filling nanotubes with magnetic ferrofluids or attachment of magnetic nanoparticles to CNTs or their polymeric coating. These strategies allow the generation of novel versatile systems that can be employed in many biotechnological or biomedical fields. Here, we review and discuss the most recent papers dealing with the preparation of magnetic CNTs and their application in biomedical and biotechnological fields.     

Preparation of novel CNSL‐based urethane polyol via nonisocyanate route: Curing with melamine‐formaldehyde resin and structure–property relationship

In this study, we report preparation of a novel cashew nut shell liquid (CNSL)‐based polyol bearing urethane groups. The urethane group in the polyol was induced via isocyanate free route from the reaction of cyclic carbonate with primary amine. The polyol was characterized by determination of hydroxyl number, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and so forth. The polyol was then used as coating component and cured with hexamethoxy methylene melamine (HMMM). Another CNSL‐based polyol without urethane moiety from our earlier reported work was used for preparation of coating for comparative study to determine the effect of urethane group on the coating properties. The coating formulations based on these two polyols were cured with variable amounts of HMMM hardener to optimize coating properties. All the coatings were evaluated for mechanical properties such as adhesion, flexibility, pencil and scratch hardness, impact resistance, pull‐off, and adhesion. The optimized coatings were also evaluated for chemical and thermal properties. It was observed that the urethane containing polyol resulted in better adhesion to the metal substrate at higher quantity of HMMM hardener compared to the other polyol providing significant improvement in various coating properties. The final coating properties were also compared with the acrylic polyurethane coatings. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41391.     

有机硅涂层材料的研制与应用

简要介绍了有机硅涂层材料的分类、特性、制备工艺以及应用,并展望了有机硅涂层材料的发展趋势。     

Preparation of water-soluble magnetic nanoparticles with controllable silica coating

This work provides a general method for preparing monodisperse,water-soluble and paramagnetic magnetic nanoparticles which are easy to be modified.Firstly,magnetic silica with core-shell structure was prepared according to a previous work.Then,the magnetic silica was treated with alkali solution to afford magnetic nanoparticles.With the increase of calcination temperature for the preparation of magnetic silica,the crystallinity and the magnetic responsibility of magnetic silica strengthened,meanwhile,the corresponding magnetic nanoparticles kept monodisperse without any aggregation.The magnetic nanoparticles are comprised of cobalt ferrite and a silica coating.The silica coating on the cobalt ferrite facilitates the magnetic nanoparticles well-dissolved and monodisperse in water,and easily modified.     

环氧基POSS改性环氧树脂的研制与性能研究

以苯基三乙氧基硅烷(PTES)和β-3,4-环氧环己基乙基三甲氧基硅烷(A186)为原料,甲醇、乙醇混合溶液为溶剂,酸性条件下水解制得含有Si—H键的环氧基低聚倍半硅氧烷(EP-POSS),通过傅里叶红外光谱(FT-IR)、核磁共振氢谱(¹H NMR)、核磁共振硅谱(²⁹Si NMR)等手段对其结构进行表征。用制备的EP-POSS对环氧树脂进行改性,分析了EP-POSS用量对树脂涂层附着力、耐冲击性、疏水性、耐热稳定性的影响。结果表明:当EP-POSS加入量为5%时,环氧树脂涂层附着力达到1级,耐冲击性达到50 cm,对水的接触角为90°,热稳定性大幅提升。     

乙基纤维素在中药制剂中的应用

乙基纤维素具有优良的疏水性、黏性和化学稳定性,在中药制剂中的应用主要是作为薄膜包衣材料、骨架和载体等起到缓/控释作用。通过针对乙基纤维素包衣液处方组成优化,制备缓释囊材,用于骨架黏合材料方面应用研究的阐述,为今后中药缓控释制剂的进一步开发研究提供参考。     

水泥基渗透结晶型防水涂料力学性能的试验研究

水泥基渗透结晶型防水涂料是一种新型防水涂料,在混凝土中可以形成不溶于水的结晶体,填塞毛细孔道,使混凝土致密、防水,提高混凝土的耐久性。本研究通过正交试验配制水泥基渗透结晶型防水涂料,研究了不同的材料组成对其力学性能的影响,从而为水泥基渗透结晶型防水涂料的研究开发以及产品的优化提供理论依据。     

New fluorinated acrylic polymers for improving weatherability of building stone materials

Acrylic polymers are widely used for their suitability to be shaped in different molecular structures. However, while very appropriate for many applications, these materials are characterized by a limited outdoor stability. In order to improve this last characteristic while maintaining the simple and flexible synthetic route, a study was performed based on the preparation of fluorinated polymers from acrylic monomers where several H-atoms in different positions were replaced with F-atoms. The structure design was aimed to optimize (e.g. minimize) the fluorine content of the final material while obtaining improved chemical and photochemical stability, good filmability and limited permeability to condensed water. The preparation of polymers of methacrylates derived from partially fluorinated alcohol by free radical mechanism is described. The fluorine content and distribution in the macromolecules is modulated by selecting different monomers and by copolymerization with nonfluorinated acrylates or vinylethers. The selection of the comonomers and their relative content in the polymer allows to control the glass transition temperature and the filmability as well as the protection efficiency of the coating. Polymers derived from more complex monomers such as -trifluoromethyl-methylacrylate are also described. The suitability of these new materials for protective coating of stones is tested by evaluating their stability to different chemical and physical agents and their selective permeability to water vapour vs. condensed water.     

Spray-coated SnO2 electron transport layer with high uniformity for planar perovskite solar cells

SnO₂ has been proven to be an effective electron transport layer(ETL)material for perovskite solar cells(PSCs)owing to its excellent electrical and optical properties.Here,we introduce a viable spray coating method for the preparation of SnO2 films.Then,we employ a SnO₂ film prepared using the spray coating method as an ETL for PSCs.The PSC based on the spray-coated SnO₂ ETL achieves a power conversion efficiency of 17.78%,which is comparable to that of PSCs based on conventional spin-coated SnO₂ films.The large-area SnO₂ films prepared by spray coating exhibit good repeatability for device performance.This study shows that SnO₂ films prepared by spray coating can be applied as ETLs for stable and high-efficiency PSCs.Because the proposed method involves low material consumption,it enables the low-cost and large-scale production of PSCs.     

吗啉催化剂的研制

吗啉是具有重要用途的精细化工产品之一,已广泛应用于农药、医药、橡胶、涂料等行业。当前吗啉的生产工艺是以二甘醇法（DEG法）为主,该工艺存在的的主要问题就是催化剂的活性不高,本文研究和评价了以沉淀法制备二甘醇法工艺生产吗啉的催化剂。