纳米技术在建筑涂料中的应用及发展前景

介绍了纳米技术在建筑涂料中的应用现状,对常用于改性建筑涂料的纳米材料进行了论述,叙述了纳米材料在建筑涂料中的应用成果,指出了纳米技术在建筑涂料应用中存在的问题,重点针对改性建筑涂料安全性进行了深入研究,同时对纳米技术在建筑涂料中的发展前景进行了展望。     

水泥助磨剂的应用研究现状与展望

阐述了水泥助磨剂在水泥粉磨过程中的主要作用，对现有助磨剂进行了分类，对助磨剂在粉磨过程中的作用机理研究进行了阐述，对我国水泥助磨剂的研究应用现状进行了总结，对今后的研究方向进行了展望。     

纳米材料在功能纺织品中的应用

本文对纳米材料在纺织品中的抗紫外、抗菌、抗静电功能进行了介绍,并对其在功能纺织品中的应用前景进行了展望。     

牙膏中的活性原料综述

本文对牙膏中的一些活性原料进行了综述。对阳离子表面活性剂、摩擦剂、酶及各种维生素在牙膏中的作用进行了研究。     

高分子材料在药品包装中的应用

本文对高分子材料在药品包装中的应用进行了阐述,并对高分子材料在药品包装中的应用前景进行了简单预测。     

涂料中进行“重金属”测试使用的标准分类

主要介绍了有关重金属测试的涂料标准,并按"可溶性"重金属含量和总含量测试,涂料和颜填料中的重金属测试进行了标准分类,介绍了涂料中进行产品认证所使用的检测标准。最后对标准中的测试方法进行了总结。     

固体吸附制冷系统中的气液回热

对固体吸附制冷系统中的气液回热进行了研究,对回热量在吸附制冷系统中的影响进行了理论分析,并通过试验验证了气液回热对系统产生的积极影响.     

膜分离技术用于废水中金属的分离和回收

废水中的金属元素是污染环境的主要因素之一,对废水中的金属元素进行分离回收可以充分利用资源,减少污染。通过膜分离技术进行二次金属资源的回收和水的回用处理已有大量研究,并在工程实践中获得效益。综述了几种常见的膜分离技术,分析了各种技术在金属分离及回收中的适用条件和局限性,并对膜分离技术在金属废水资源化中的应用前景及发展进行了展望。     

回转炉在催化剂制备中的应用

本文对回转炉在催化剂工业化制备过程中的应用进行了探讨,并对其中的关键技术进行了详细分析,并对其在催化剂制备中的扩展应用和发展方向给出了建议。     

膜技术在油田采出水处理中的应用

综合介绍了膜技术在我国油田采出水处理中的应用,重点介绍了微滤、超滤和纳滤技术在油田采出水处理中的应用,并对油田采出水水质的特点和膜技术目前存在的不足进行介绍,对未来膜技术在油田采出水处理中的应用进行了展望。     

硒化镉量子点的二氧化硅包覆

将油溶性、单分散、高荧光强度的CdSe荧光纳米晶用Stber方法成功地制备了SiO2包覆的荧光纳米晶,包覆后的纳米晶在水中和醇中有良好的溶解性,具有非常好的化学稳定性。SiO2包覆后的纳米晶也具有较强的荧光特性。..     

Synthesis and Color Evolution of Silica-Coated Hematite Nanoparticles

The aim of this communication is to investigate the color evolution of silica-coated hematite nanoparticles versus treating temperature. The silica-coated hematite nanoparticles were prepared by first suspending commercial hematite nanoparticles in an ammonia–water–2-propanol system, and then depositing amorphous nano-SiO₂ onto the surface of hematite nanoparticles using the Stöber method. The silica-coated nanoparticles were dripped onto biscuits and heat treated at various temperatures. The color changes of heat treated samples were determined by the CIE L ^* a ^* b ^* parameters, and the possible mechanism of color evolution was discussed.     

Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process

Described herein is the synthesis of individually silica-coated silver nanoparticles using a reverse micelle method followed by hydrolysis and condensation of tetraethoxysilane (TEOS). The size of a silica-coated silver nanoparticle can be controlled by changing the reaction time and the concentration of TEOS. By maintaining the size of a silver nanoparticle as a core particle at around 7 nm, the size of a silica-coated silver nanoparticle increased from 13 to 28 nm as the reaction time increased from 1 to 9 h due to an increase in silica thickness. The size of silica-coated silver nanoparticles also increased from 15 to 22 nm as the TEOS concentration increased from 7.8 to 40 mM. The size of a silica-coated silver nanoparticle can be accurately predicted using the rate of the hydrolysis reaction for TEOS. Neither the dispersion nor the film of silica-coated silver nanoparticles exhibited any peak shifting during surface plasmon resonance (SPR) at around 410 nm, whereas, without silica coating, the SPR peak of Ag film shifted to 466 nm.     

Magnetic Properties of Nickel–Zinc Ferrite Toroids Prepared from Nanoparticles

Toroids comprised of silica-coated 10 nm diameter nickel–zinc (Ni–Fe) ferrite nanoparticles (Ni_0.5Zn_0.5Fe₂O₄) have been fabricated by careful control of both the coating process and subsequent densification by viscous sintering. A narrow processing window is identified between a maximum temperature at which the nanoparticles coarsen, losing their super-paramagnetic properties, and a lower temperature required for viscous flow densification. Key to the successful fabrication was drying and cold isostatic pressing of the silica-coated nanoparticles; other routes invariably led to cracking during either drying or sintering. The super-paramagnetic blocking temperature, the coercive field, and remanent magnetization could all be controlled over a wide range by varying the thickness of the silica coating from 1 to 15 nm. The dipole–dipole coupling distance is estimated to be 4 nm. The high-frequency (1–500 MHz) properties were sensitive to the sintering temperature as well as the thickness of the silica coating. Toroids sintered at 1000°C or less exhibited no high-frequency magnetic losses and their permeability decreased with increasing temperature, suggesting that the permeability was controlled by thermally activated magnetization relaxation.     

Preparation of Core/Shell CaO@SiO2-SO3H as a Novel and Recyclable Nanocatalyst for One-Pot Synthesize of Dihydropyrano[2,3-c]Pyrazoles and Tetrahydrobenzo[b]Pyrans

Silicon - The core/shell CaO@SiO2-SO3H nanoparticles were prepared by stabilizing of sulfonic acid on the surface of silica-coated CaO nanoparticles. The structure of CaO@SiO2-SO3H was...     

Oleic Acid Protects Endothelial Cells from Silica-Coated Superparamagnetic Iron Oxide Nanoparticles (SPIONs)-Induced Oxidative Stress and Cell Death

Superparamagnetic iron oxide nanoparticles (SPIONs) have great potential for use in medicine, but they may cause side effects due to oxidative stress. In our study, we investigated the effects of silica-coated SPIONs on endothelial cells and whether oleic acid (OA) can protect the cells from their harmful effects. We used viability assays, flow cytometry, infrared spectroscopy, fluorescence microscopy, and transmission electron microscopy. Our results show that silica-coated SPIONs are internalized by endothelial cells, where they increase the amount of reactive oxygen species (ROS) and cause cell death. Exposure to silica-coated SPIONs induced accumulation of lipid droplets (LD) that was not dependent on diacylglycerol acyltransferase (DGAT)-mediated LD biogenesis, suggesting that silica-coated SPIONs suppress LD degradation. Addition of exogenous OA promoted LD biogenesis and reduced SPION-dependent increases in oxidative stress and cell death. However, exogenous OA protected cells from SPION-induced cell damage even in the presence of DGAT inhibitors, implying that LDs are not required for the protective effect of exogenous OA. The molecular phenotype of the cells determined by Fourier transform infrared spectroscopy confirmed the destructive effect of silica-coated SPIONs and the ameliorative role of OA in the case of oxidative stress. Thus, exogenous OA protects endothelial cells from SPION-induced oxidative stress and cell death independent of its incorporation into triglycerides.     

Magnetic Ru Nanocatalysts for Sustainable Hydrogenation of CO2 Gas to Formic Acid

Catalysis Letters - We performed the Ru nanoparticles encapsulation using silica-coated carbon-cobalt nanostructure (with and without amine functionality). The physicochemical properties of the...     

Facile recycling approach for waste minimization of silica-coated magnetite nanoparticles synthesis

The negative environmental impacts of industrial activity have been felt day-to-day, encouraging global actions to reduce the waste generation of harmful and persistent pollutants. Microemulsion synthesis of silica-coated iron oxide magnetic nanoparticles offers a high potential for several applications; however the process generates hazardous wastes that are difficult to treat and dispose of. In this study, cyclohexane and methanol were separated using phase decantation, distillation, and temperature reduction. The recovered solvents were reused in the same synthesis more than 20 times and the recovered surfactant IGEPAL® CO-520 was reused twice, suggesting the method applied has potential for continuous recycling.     

Sulfonic Acid-Functionalized Silica-Coated Magnetic Nanoparticles as a Reusable Catalyst for the Preparation of Pyrrolidinone Derivatives Under Eco-Friendly Conditions

Silicon - The surface of silica-coated CoFe2O4 magnetic nanoparticles (CoFe2O4@SiO2), which is resistant to the oxidation due to silicone coating, was functionalized using chlorosulfonic acid and...     

A rapid method for the preparation of silica-coated ZrO2 nanoparticles by microwave irradiation

A novel synthesis of silica-coated ZrO₂ nanoparticles is reported based on microwave irradiation (MW) method. The synthesis of silica-coated ZrO₂ nanoparticles was realized by a rapid uniform hydrolysis and subsequent copolymerization of the precursor tetraethoxysilane (TEOS) on ZrO₂ surface. One of the advantages of this MW irradiation method is the very short coating time and uniform heating in comparison to the conventional ones, allowing the synthesis of uniformly coated ZrO₂ nanoparticles with silica. The XPS analysis revealed the shifts in binding energies for Zr 3d5/2 and Zr 3d3/2 peaks after coating confirming the formation of silica layer on the surface of ZrO₂ nanoparticles. Characteristic silica peaks were observed in the FTIR spectra of coated nanoparticles. The shift in the isoelectric point measured by dynamic light scattering method was indicator of silica coverage of the ZrO₂ surface. The coatings formed at 70 °C were thin and uniform and extended up to 2 nm from the ZrO₂ surface as confirmed by the HR-TEM images.