共查询到20条相似文献,搜索用时 312 毫秒
1.
磁性微纳米材料的功能化及其在食物样品前处理中的应用进展 总被引:1,自引:0,他引:1
磁性固相萃取是当前对复杂样品中痕量目标物进行有效分离富集的热门技术,功能化磁性微纳米粒子是该技术应用中的关键材料。本文综述了各种已报道的功能化磁性微纳米材料,总结了包括表面嫁接有机小分子、表面包覆碳或无机氧化物、表面嫁接或包覆聚合物、载体表面或孔道内负载磁性纳米粒子、载体骨架内掺入磁性纳米粒子、物理共混法制备磁性功能材料在内的6种功能化方法,并对功能化磁性微纳米材料在食物样品前处理中的应用进行了简要评述。 相似文献
2.
3.
4.
碳纳米管和石墨烯是碳纳米材料的典型代表,其纳米尺度赋予了其优异的光、电、热以及机械性能。然而,这些碳纳米材料间存在较强的范德华力,导致其溶解性差,后续加工处理困难。为提高碳纳米材料的溶解性,通常利用聚合物或其它小分子物质对其进行修饰。而利用刺激响应性聚合物或化合物功能化碳纳米材料,不仅可以提高其溶解性,还可以赋予其环境刺激响应功能。本文主要综述了近年来利用温度、pH、光以及CO2响应聚合物或小分子化合物对碳纳米管和石墨烯进行共价键、非共价键修饰并赋予其环境刺激响应特性的方法、功能和相关应用,展望了修饰得到的纳米碳杂化材料的应用前景及下一步发展方向。 相似文献
5.
6.
7.
本文围绕近年来基于配位聚合物的纳米材料可控合成的研究工作,包括配合物纳米材料和以其为前体制备各种氧化物、硫化物等半导体材料和磁性材料。总结了配合物纳米材料的制备主要有液相法、微乳法、扩散法、界面反应法、水热/溶剂热法、高温裂解法等及应用方面的研究进展,并展望了配合物纳米材料今后可能的发展方向。 相似文献
8.
9.
无机纳米材料的合成是纳米科学发展的前提和基础之一。区别于传统的高温湿化学合成法,光化学方法在无机纳米材料的合成中表现出许多优点,并在近年来受到了广泛关注。本文分三个部分综述了近年来光化学方法在无机纳米材料合成中的应用,具体包括贵金属纳米材料的光化学合成与负载,半导体纳米材料的光化学合成以及表面等离子体共振诱导的各向异性金属纳米晶合成。最后,在总结光化学方法在无机纳米材料合成中体现出的优势及目前研究仍存在不足的基础上,我们对其未来可能的发展方向进行了展望。 相似文献
10.
11.
讲述了单糖与苯硼酸间的酯化反应过程及影响因素,举例说明了此类反应在化学和生物学中的应用,拓展了有机化学教学中关于单糖化合物的应用介绍,引导学生提升对化学和生物学交叉领域学习和研究的兴趣。 相似文献
12.
Kosheli Thapa Magar George Frimpong Boafo Xiaotong Li Zhongjian Chen Wei He 《中国化学快报》2022,33(2):587-596
Biological drugs are attracting tremendous attention in disease treatment. However, their application is significantly limited by their inherent properties, such as high hydrophilicity, poor membranepermeability, low stability, and larger size. Liposome-based drug delivery systems are emerging as promising tools to improve their delivery, owing to their ability to reduce toxicity, improve bioavailability,and enhance the therapeutic efficacy of the drug by optimizing delivery to the specific targ... 相似文献
13.
Chitosan (CS) is a natural polymer with a positive charge, a deacetylated derivative of chitin. Chitosan nanostructures (nano-CS) have received increasing interest due to their potential applications and remarkable properties. They offer advantages in stomatology due to their excellent biocompatibility, their antibacterial properties, and their biodegradability. Nano-CSs can be applied as drug carriers for soft tissue diseases, bone tissue engineering and dental hard tissue remineralization; furthermore, they have been used in endodontics due to their antibacterial properties; and, finally, nano-CS can improve the adhesion and mechanical properties of dental-restorative materials due to their physical blend and chemical combinations. In this review, recent developments in the application of nano-CS for stomatology are summarized, with an emphasis on nano-CS’s performance characteristics in different application fields. Moreover, the challenges posed by and the future trends in its application are assessed. 相似文献
14.
15.
16.
Sol-Gel Coatings on Metals 总被引:4,自引:0,他引:4
Massimo Guglielmi 《Journal of Sol-Gel Science and Technology》1997,8(1-3):443-449
Sol-gel derived films can be deposited on metals to improve their resistance to oxidation and corrosion or to modify their
surface properties. However, practical applications are limited by problems intrinsic to sol-gel processing or specific of
coating/metal systems.
Coatings aimed to improve oxidation and wet corrosion resistance have been the most studied. The results published in the
literature show that sol-gel coatings may offer good protection against oxidation. More difficult is to achieve a protection
against wet corrosion.
An important aspect of the application of the sol-gel method for coating metallic objects is also the deposition technique. 相似文献
17.
Hendrikus C. L. Abbenhuis 《Angewandte Chemie (International ed. in English)》1999,38(8):1058-1060
Beyond mere convenience: In large-scale industrial processes for alkene polymerization the essentially homogeneous metallocene/activator catalyst systems are heterogenized (example shown) to improve polymer properties. New mesoporous and organic catalyst supports and their application in this field of catalysis are described. 相似文献
18.
19.
André de Villiers Phillipus Alberts Andreas G.J. Tredoux Hélène H. Nieuwoudt 《Analytica chimica acta》2012
Analytical chemistry is playing an ever-increasingly important role in the global wine industry. Chemical analysis of wine is essential in ensuring product safety and conformity to regulatory laws governing the international market, as well as understanding the fundamental aspects of grape and wine production to improve manufacturing processes. Within this field, advanced instrumental analysis methods have been exploited more extensively in recent years. Important advances in instrumental analytical techniques have also found application in the wine industry. This review aims to highlight the most important developments in the field of instrumental wine and grape analysis in the African context. The focus of this overview is specifically on the application of advanced instrumental techniques, including spectroscopic and chromatographic methods. Recent developments in wine and grape analysis and their application in the African context are highlighted, and future trends are discussed in terms of their potential contribution to the industry. 相似文献
20.
元素部分是无机化学教学中的难点.笔者结合自己的教学实践和教学对象,根据元素化学教学内容的特点,从问题的设定,过程中的实施、效果与评价,多媒体辅助等几方面论述了元素化学教学的实施过程与方法.经验表明,该方法能提高学生的各项能力,充分调动学生的主动性与积极性,有助于元素化学教学质量的提高. 相似文献