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HuiGangWANG PingCHEN XiaoMingZHENG 《中国化学快报》2004,15(4):478-481
Hollow polysiloxane particles with diameters between 1.40 and 1.60 micrometres were fabricated by consecutive cocondensation of methyltrimethoxysilane and diphenyldimethoxysilane monomers onto polydiphenylsiloxane,subsequently removing the templated polydiphenylsiloxane by exposure to solvents.TEM and AFM measurement reveal that there are obvious hollow sphere structures for the polysiloxane microsphere particles.The hollow spheres are envisioned to have applications in areas ranging from dye-industry,catalysis,pharmaceutics to materials science. 相似文献
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以胶质碳球为模板、六亚甲基四胺为沉淀剂,在乙醇中溶剂热反应,再经500℃煅烧6 h制备了NiO空心球。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)和低温氮吸附-脱附,对NiO的结构和形貌进行了表征。结果表明溶剂热反应时间是制备完整NiO空心球的关键因素,溶剂热反应12 h,再经空气中煅烧,可制得形貌均一的NiO空心球。所得产物是由NiO纳米粒子组装而成的具有多孔结构的空心球。同时,本文对NiO空心球结构的形成过程和可能机理进行了分析和讨论。 相似文献
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采用模板法在水热条件下合成了掺La的NiO多孔空心球。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电子显微镜(TEM)和X射线能谱(EDS)对其结构和形貌进行了表征。采用循环伏安、恒流充放电技术对其电化学性能进行了测试,研究结果表明,La掺杂对NiO空心球的粒径、壳层厚度和电化学性能均有显著影响,当La掺杂量为1.30mol%时,掺杂后NiO的单电极比电容达到205 F.g-1,比未掺杂的提高了50%,并且表现出良好的循环稳定性和可逆性。 相似文献
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Huifang Xu Wei Wei Chengliang Zhang Shujiang Ding Xiaozhong Qu Dr. Jiguang Liu Dr. Yunfeng Lu Prof. Zhenzhong Yang Prof. 《化学:亚洲杂志》2007,2(7):828-836
This report presents a facile approach for the low‐temperature synthesis of crystalline inorganic‐oxide composite hollow spheres by employing the bulk controlled synthesis of inorganic‐oxide nanocrystals with polymer spheres as templates. The sulfonated polystyrene gel layer can adsorb the target precursor and induce inorganic nanocrystals to grow on the template in situ. The crystalline phase and morphology of the composite shell is tunable. By simply adjusting the acidity of the titania sol, crystalline titania composite hollow spheres with tunable crystalline phases of anatase, rutile, or a mixture of both were achieved. The approach is general and has been extended to synthesize the representative perovskite oxide (barium and strontium titanate) composite hollow spheres. The traditional thermal treatment for crystallite transformation is not required, thus intact shells can be guaranteed. The combination of oxide properties such as high refractive index, high dielectric constant, and catalytic ability with the cavity of the hollow spheres is promising for applications such as opacifiers, photonic crystals, high‐κ‐gate dielectrics, and photocatalysis. 相似文献
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中空球是壳层结构材料的一个重要分支。与实心球相比较,中空球具有更多特殊和优异的物理及化学性质,例如具有较小的密度、较大的比表面积以及较好的稳定性和表面渗透性,其中无机中空球较有机中空球还具有耐高温、抗老化等优点。因此,近些年来无机中空球备受人们的关注,广泛应用于催化、电池、医药等众多领域。本文结合本课题组在无机氧化物中空球领域的研究和前人的工作,总结了近5年来制备无机中空球的研究进展。将无机中空球的壳层材料分为五大类,包括:无机氧化物、硫化物及硒化物、金属单质、复合物和其他无机材料。将制备方法分成四大类:硬模板法、软模板法、牺牲模板法和无模板法,对每一大类又进一步细分,并且指出了各种方法的优缺点。同时归纳了无机中空球几个重要的应用领域,如药物、电池、气体传感器和光催化领域。最后在此基础上简要展望了无机中空球的研究前景。 相似文献
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XianYunXU XiaoGuangLI 《中国化学快报》2003,14(7):759-762
NanocrystaUine MoS2 with hollow spherical morphology has been prepared by the hydrothermal method. The products are characterized by means of X-ray powder diffraction,transmission electron microscopy and high-resolution transmission electron microscopy. The experimental results give the evidence that the sample is consists of hollow spheres 400~600nm in diameter, and there is much whisker on the surface of MoS2 hollow sphere. 相似文献
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CaCO3 hollow spheres were prepared easily in anion surfactants (sodium dodecylbenzenesulfonate (SDBS)) and aspartic (Asp) acid binary-additive system by using an easy rapid agitation method. The as-prepared products were characterized with scanning electron microscopy (SEM), FT-IR and X-ray diffraction. The results suggested that the CaCO3 hollow spheres have diameters ranging from 1 to 2 μm, and their wall is constituted of many nano-particles. Moreover, the possible formation mechanism of the hollow spherical structure was proposed. 相似文献
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Wenbo Sheng Wei Li Bin Li Cuihua Li Yisheng Xu Xuhong Guo Feng Zhou Xin Jia 《Macromolecular rapid communications》2015,36(18):1640-1645
A thermo‐controlled pesticide release system composed of poly(2‐(dimethylamino)ethyl methacrylate) (PDMAEMA) thin film grafted polydopamine (PDA) (PDMAEMA‐g‐PDA) microcapsules is reported. SiO2 microparticles are used as a template to prepare PDA‐coated SiO2 microparticles. The thermally‐responsive PDMAEMA thin films are grafted on PDA surfaces using a metal‐free surface‐initiated photopolymerization approach without adding any photoinitiator or photosensitizer under UV light irradiation. The subsequent acid etching yields PDMAEMA‐g‐PDA hollow microcapsules. PDMAEMA‐g‐PDA microcapsules exhibit well‐controlled release of avermectin (Av). The results show that the loading ability of PDMAEMA‐g‐PDA microcapsules of Av is up to 52.7% (w/w). The release kinetics of Av demonstrate that Av@PDMAEMA‐g‐PDA microcapsules exhibit temperature‐controlled release performance. This work is significant for controlled release systems. This simple design is expected to be used in various applications, such as in controlled drug release and agriculture‐related fields.
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