私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯(lián)系方式
  • 通信地址:天津市衛(wèi)津路南開大學高分子化學研究所蒙民偉樓417
  • 郵編:300071
  • 電話:022-23509794
  • 傳真:
  • Email:wqzhang@nankai.edu.cn
當前位置:> 首頁 > 論文著作 > 正文
Synthesis of Hierarchical Hollow Silica Microspheres Containing Surface Nanoparticles Employing the Quasi-Hard Template of Poly(4-vinylpyridine) Microspheres
作者:Su, Yang; Yan, Rui; Dan, Meihan; 等.
關鍵字:Poly(4-vinylpyridine) Microspheres
論文來源:期刊
具體來源:LANGMUIR
發(fā)表時間:2011年

pubs.acs.org/doi/abs/10.1021/la2014573

A facile method of preparing hierarchical hollow silica microspheres containing surface silica nanoparticles (HHSMs) through the sol–gel process of tetraethylorthosilicate employing a quasi-hard template of non-cross-linking poly(4-vinylpyridine) microspheres is proposed. The quasi-hard template contains the inherent catalyst of the basic pyridine group, and a few of the polymer chains can escape from the template matrix into the aqueous phase, which initiates the sol–gel process spontaneously both on the surface of the template used to prepare the hollow silica shell and in the aqueous phase to produce the surface silica nanoparticles. By tuning the weight ratio of the silica precursor to the quasi-hard template, HHSMs with a size of about 180 nm and a shell thickness ranging from 14 to 32 nm and surface silica nanoparticles ranging from 17 to 36 nm are produced initially through the deposition of surface silica nanoparticles onto the silica shell, followed by template removal either by calcination or solvent extraction. The synthesized HHSMs are characterized, and a possible mechanism for the synthesis of HHSMs is proposed.

主站蜘蛛池模板: 大理市| 中阳县| 连平县| 马关县| 东至县| 修武县| 隆昌县| 桂阳县| 双牌县| 永嘉县| 建宁县| 濮阳市| 珲春市| 九台市| 视频| 清徐县| 于田县| 四子王旗| 河南省| 奉化市| 武威市| 马龙县| 枣阳市| 营口市| 读书| 高陵县| 浙江省| 观塘区| 开鲁县| 郸城县| 芮城县| 呼和浩特市| 台湾省| 西青区| 南召县| 贺兰县| 沐川县| 铜梁县| 蓬安县| 临沂市| 宣汉县|