MoO3纳米带自组装合成MoS2微球

以MoO3纳米带为前驱体,四丁基溴化铵为表面活性剂,通过水热途径成功合成了MoS2花状微球。用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对产物的结构及形貌进行表征和分析。结果表明:MoS2花状微球由带状结构组成,其直径大约为4μm。     

聚苯乙烯/无机粒子(核/壳)复合微球的制备与研究进展

综述了近年来国内外聚苯乙烯(PS)/无机粒子(核/壳)复合微球的制备方法,如化学沉积法、静电自组装法和化学镀法等,简述了PS/无机粒子(核/壳)复合微球的优异性能及其应用,展望了PS/无机粒子(核/壳)复合微球的发展前景。     

SiO2/TiO2核壳结构微球的制备及其光散射特性研究

采用液相沉积法成功制备了SiO₂/TiO₂核壳结构微球,研究反应温度、（NH₄）₂TiF₆溶液浓度对微球形貌、晶型以及壳层厚度的影响,并测试其光散射特性。研究发现:随着反应温度的升高,SiO₂/TiO₂核壳结构微球的表面包覆程度、壳层TiO₂结晶程度逐渐提高;改变（NH₄）₂TiF₆溶液浓度,可制备出不同壳层厚度的核壳结构微球;SiO₂/TiO₂核壳结构微球和SiO₂微球相比,其光散射能力显著增强,且光散射能力随着壳层厚度的增加而逐渐加强。     

核壳结构SiO_2/SnO_2纳米复合微粒的合成与表征

文章从TEOS出发,先水解制备了纳米二氧化硅微粒,再以五水四氯化锡为锡源,碳酸铵为沉淀剂,通过控制反应条件,用共沉淀法在二氧化硅表面包覆上一层锡化物层,经600℃煅烧2 h后形成了具有核壳结构的SiO2/SnO2纳米复合微粒,并用透射电镜、激光粒度仪、FTIR等手段对其形貌、结构、组成进行了表征。结果表明：形成的核壳结构SiO2/SnO2纳米复合微粒是以二氧化硅为核,氧化锡为壳,内核直径约为120 nm,壳层厚度为8～18 nm;氧化锡基本以成膜包覆为主,伴有部分氧化锡自身成核团聚。     

Au-SiO2复合纳米微球的制备与表征

采用溶胶-凝胶法制备SiO2纳米微球,以KH-550为粘结剂,利用简单的化学还原法,成功制备出Au-SiO2复合纳米微球,并通过扫描电子显微镜,透射电子显微镜,X射线衍射仪,紫外-可见分光光度计和多功能成像光电子能谱仪对其进行表征.结果表明,Au-SiO2复合纳米微球粒径约130 ～ 160 nm,且颗粒较均匀、分散性较好.样品中金纳米粒子均匀分散于SiO2纳米微球表面,粒径约4～9 nm,具有良好的面心立方结构,晶型良好,且Au物种主要以零价金属态存在.     

无机-有机核壳结构纳米复合粒子研究进展

采用耦合剂、LBL等技术,通过模板反应、乳液聚合等制备了无机-有机核壳结构纳米粒子。结果表明,无机纳米粒子能均匀分散在有机体中,或包覆于有机物的外层,有效防止了纳米粒子的团聚;该类材料不仅具有核、壳两类材料的性能,也具有某些独特的性能,其在光、电、磁及光催化等领域具有良好的应用前景,应加强该类材料的制备和应用技术研究,挖掘其潜在价值。     

核壳结构复合微球研究进展

核壳结构复合微球通常由中心核和包覆在外部的壳组成,其特殊的结构使其实现了材料的多功能化.本文综述了核壳型复合材料的研究进展及在相关领域的应用,着重介绍了四类别该材料在制备过程中壳/核的设计与调控以及对相关制备方法的评述.最后结合本课题组的工作对该类材料的未来发展做了展望.     

Fe3O4/P(St-CBA)核壳磁性复合微球的制备及性质

运用分散聚合法制备出Fe     

核壳结构聚合物/金属复合微球的合成及应用研究进展

核壳结构复合微球的制备可实现粒子性能的设计和优化,尤其是以聚合物微球为核、金属层为壳的半有机半无机结构球形材料,成为近年来导电微球领域的研究热点。本文综述了磁控溅射法、溶胶凝胶法、原位还原法、层层自组装法和紫外辐照法等核壳结构聚合物/金属复合微球的主要制备方法及各自的优缺点。介绍了该类微球在诸如各向异性导电膜（ACF）、污水处理、吸波材料和表面增强拉曼散射（SERS）等具体领域的应用情况,并对其今后的发展进行了展望。     

纳米SiO2/MF复合微球的制备与性能研究

采用沉淀聚合法由纳米SiO₂、三聚氰胺、甲醛共聚制备了纳米SiO₂/三聚氰胺甲醛(MF)复合微球,通过光学显微镜和扫描电子显微镜观测以及热重分析和上清液中SiO₂的含量测定研究了反应时间、反应温度、催化剂以及纳米SiO₂粒径对复合微球外观及性能的影响。结果表明,最佳反应条件为：反应时间4 h,反应温度80℃,采用硝酸为催化剂。随着纳米SiO₂粒径的增大,纳米SiO₂/MF复合微球的粒径逐渐变小。纳米SiO₂可显著增强MF微球的热稳定性,扩大其在木材复合材料和其他行业的应用范围。     

单分散PSt/SiO_2杂化材料微球的制备及表征

以硅酸乙酯和丙烯酸反应制备了硅酸乙酯-丙烯酸单体,再将其和苯乙烯通过无皂乳液法共聚制备了单分散PSt/SiO2杂化材料微球。用FTIR、SEM、EDS、TG-DSC等对杂化材料微球进行了表征。结果表明有机组分和无机组分间以Si-O-C键相连接成交联结构,杂化材料只有一个玻璃化转变温度120℃,杂化材料微球粒径均一、大小约为300nm,单分散性的杂化材料微球乳液在室温下蒸发很容易自组装成有序的结构。     

载穿心莲内酯核-壳型Ca-Alg/pNIPAM微球的制备及性能

针对穿心莲内酯(AND)口服给药存在药物苦极问题,拟制备一种有效掩蔽药物苦味且能实现药物控释的微球载体。以海藻酸钠(Na-Alg)和N-异丙基丙烯酰胺(NIPAM)为制备材料,采用静电液滴偶联单体聚合工艺制备了核-壳型AND/Ca-Alg/pNIPAM微球。采用扫描电微观测、红外光谱分析、溶胀实验和体外释药实验等表征微球结构与性能。结果表明:与Ca-Alg微球相比,Ca-Alg/pNIPAM微球具有清晰的核-壳结构;微球平衡溶胀率在32—36℃突降14.6%;微球在模拟胃液中2 h内药物累积释放率低于10%,而在模拟肠液中6—8 h即达到释放平衡且释药动力学符合Reter-Peppas模型。核-壳结构使Ca-Alg/pNIPAM微球在高效负载药物的同时掩蔽了药物苦味,并赋予微球温度/pH双重响应特性,实现了药物肠靶向释放。     

核壳型纳米SiO2/含氟聚丙烯酸酯复合乳液的合成与表征

采用原位乳液聚合法,在可聚合阴离子乳化剂/非离子乳化剂复配体系下,以γ-甲基丙烯酰氧丙基三甲氧基硅烷(KH-570)改性的纳米SiO2、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、丙烯酸(AA)等为核相组成,以MMA、BA及甲基丙烯酸十二氟庚酯(DFMA)为壳相单体,合成纳米SiO2/含氟聚丙烯酸酯复合乳液.考察了纳...     

Synthesis and characterization of Au/TiO2 core-shell structure nanoparticles

Au/TiO₂ core-shell structure nanoparticles were synthesized by sol-gel process, and the morphology and crystallinity of TiO₂ shell were investigated by TEM and UV-vis absorption spectrometer. Au/TiO₂ core-shell structure nanoparticles could be prepared by the hydrolysis of TOAA (titanium oxide acethylacetonate) in gold sol ethanol solution with water. The thickness of TiO₂ shell on the surface of gold particles was about 1 nm. To investigate the crystallinity of TiO, shell, UV light with 254 nm and radioactive ray of⁶⁰Co were irradiated on the TiO₂-coated gold sol ethanol solution. The surface plasmon band of gold nanoparticles appeared only when the radioactive ray was irradiated on the TiO₂-coated gold sol ethanol solution. From these results, it was found that the TiO, shell was amorphous and the MUA (mercaptoundecanoic acid) layer on the Au particle for its dispersion in ethanol did not act as an obstacle to disturb the movement of electrons onto the surface of Au particles.     

核壳结构Fe_3O_4@TiO_2磁性纳米复合材料的制备及性能表征

利用热分解油酸铁复合物得到油相Fe_3O_4磁性纳米粒子,以冰醋酸、钛酸四异丙酯和乙醇组成混合溶液,采用水热仿生合成法制备Fe_3O_4@TiO_2核壳结构磁性纳米复合材料。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、热重分析(TGA)及振动样品磁强计(VSM)对材料的形貌、结构、磁学性能等进行了分析表征。结果表明,TiO_2在Fe_3O_4颗粒表面进行了有效的包覆,形成了良好的包覆层,产品分散性好、结晶度高、形态稳定、磁性良好,为其在环境保护、生物、光催化等诸多领域的潜在应用提供了有利条件。     

核壳结构Fe_3O_4@TiO_2磁性纳米复合材料的制备及性能表征

利用热分解油酸铁复合物得到油相Fe_3O_4磁性纳米粒子,以冰醋酸、钛酸四异丙酯和乙醇组成混合溶液,采用水热仿生合成法制备Fe_3O_4@TiO_2核壳结构磁性纳米复合材料。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、热重分析(TGA)及振动样品磁强计(VSM)对材料的形貌、结构、磁学性能等进行了分析表征。结果表明,TiO_2在Fe_3O_4颗粒表面进行了有效的包覆,形成了良好的包覆层,产品分散性好、结晶度高、形态稳定、磁性良好,为其在环境保护、生物、光催化等诸多领域的潜在应用提供了有利条件。     

fnSiO2@mSiO2核壳粒子的制备及表征

本文将掺杂有三元荧光共振能量转移染料对的SiO2纳米核引入介孔SiO2球形粒子中,形成在单一波长激发下能产生多色荧光发射的核壳结构。产物通过TEM、XRD、BET等方法进行了表征。结果表明:成功制备得到以荧光纳米粒子为核,介孔SiO2为壳层的核壳粒子(fnSiO2@mSiO2),介孔孔径为2.5nm。     

PS/TiO2核壳型微球和空心TiO2微球有序排列的制备

利用纳米级二氧化钛（TiO₂）溶胶微粒与聚苯乙烯（PS）胶体颗粒的混合悬浮液,以垂直共沉积的方法制备了核壳型PS/TiO₂微球的有序排列。当利用煅烧的方法去除PS胶粒晶体模板后,可以形成空心TiO₂微球的三维有序排列。考察了混合悬浮液中两种胶体颗粒的体积比（PS∶TiO₂=R）对空心TiO₂微球有序排列形成的影响。实验结果表明,合适的R值（6∶1）对于空心微球有序排列的形成至关重要。与此同时,浸渍填充法对照实验的结果表明,煅烧过程中TiO₂纳米颗粒晶型转化引起的收缩是造成TiO₂空心球产生的主要原因。     

Synthesis and characterization of dialdehyde cellulose/amino-functionalized MCM-41 core-shell microspheres as a new eco-friendly flame-retardant nanocomposite

Using proper flame-retardant materials when constructing buildings or fabricating devices is the most important fire safety guidelines. The halogen and phosphorus-based compounds are among the most effective flame retardants. However, most of these compounds are recognized to have a harmful effect on human body and the environment during combustion. In this context, we designed and synthesized a new eco-friendly flame-retardant nanocomposite by combining dialdehyde cellulose (DAC) and amino-functionalized mesoporous silica MCM-41 (N-M41). Spherical N-M41 nanoparticles have been successfully prepared in one-pot reaction using tetraethyl orthosilicate and (3-aminopropyl)triethoxysilane (APTES), and then coated with different amounts of DAC through Schiff base reaction between the carbonyl group of DAC and NH₂ of APTES. The resulted DAC@N-M41 nanocomposite was characterized by XRD, Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, differential thermal analysis (DTA) and thermogravimetry analysis (TGA). TEM micrographs revealed that this nanocomposite was made up of core-shell nanospheres structure with narrow size distribution (ca. 140 nm). DTA and TGA analysis revelated that the presence of silica within the nanocomposite can effectively increase the char yield, decrease the heat release, and improve the fire performance of the prepared nanocomposite. A mechanism of the reduction in flammability of this nanocomposite has been proposed.     

Synthesis and characterization of microspheres composed of SnO2 nanoparticles processed via a chemical route

SnO₂ microspheres were synthesized by a chemical route, heating the mixed Sn²⁺ and sulfuric acid solution in the presence of pressurized oxygen at 900 °C in a designed calorimetric pump. Phase analysis was carried out by X-ray diffraction (XRD) and the results confirmed the SnO₂ microspheres as a single-phase tetragonal structure. Scanning electron microscopy (SEM) images indicated that these microspheres with average diameters of 0.9 μm were composed of SnO₂ nanoparticles with a diameter of about 4.7 nm and a crystallite size of 3.7 nm, as observed by transmission electron microscope (TEM) and calculated by Scherrer's equation from diffractograms, respectively. The formation mechanism of microspheres composed of SnO₂ nanoparticles and the influence of changes in processing are proposed and explained.