Fabrication of Silica Shell Photonic Crystals through Flexible Core Templates.
Fabrication of Silica Shell Photonic Crystals through Flexible Core Templates.
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DOI：
10.1021/cm901666b
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发表时间：
2009-10-13
影响因子：
8.6
通讯作者：
Asher, Sanford A.
中科院分区：
文献类型：
--
作者：
Wang, Luling;Asher, Sanford A.
我们将非常小的二氧化硅颗粒附着在分散聚合合成的柔性单分散聚n -异丙基丙烯酰胺（PNIPAm）核颗粒上。在24℃下，通过四乙氧基硅烷的水解和缩合，将这些二氧化硅颗粒附着在部分膨胀的PNIPAm颗粒上。所得到的二氧化硅颗粒功能化的PNIPAm核心颗粒随着温度的循环表现出可逆的膨胀和收缩。当溶剂蒸发时，这些粒子形成紧密排列的光子晶体；当纯PNIPAm干核颗粒闭合时，核收缩形成硅壳。通过煅烧去除PNIPAm核心，留下由本质上纯粹的连续二氧化硅壳组成的PC。这些硅壳光子晶体可以衍射~310 nm的紫外光。紧密排列的颗粒间隙是连续的，很容易被水填充。相反，二氧化硅外壳是不透水的，因为制造它们的过程导致了一个连续的没有孔的二氧化硅外壳。
We attached very small silica particles onto flexible monodisperse poly (N-isopropylacrylamide, PNIPAm) core particles synthesized by dispersion polymerization. These silica particles were attached to the partially swollen PNIPAm particles by the hydrolysis and condensation of tetraethoxysilane at 24 °C. The resulting silica particle-functionalized PNIPAm core particles show reversible swelling and shrinking as the temperature is cycled. These particles form close-packed-array photonic crystals as the solvent evaporates; the cores shrink to form a silica shell around the pure PNIPAm dry core particles as they close pack. The PNIPAm cores were removed by calcination, leaving a PC composed of essentially pure continuous silica shells. These silica shell photonic crystals Bragg diffract UV light at ~310 nm. The close packed particle interstices are continuous and are easily filled by water. In contrast, the silica shells are impervious to water because the process of making them results in a continuous shell of silica without holes.
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影响因子：
8.6
作者：
Caruso, F;Caruso, RA;Möhwald, H
通讯作者：
Möhwald, H
DOI：
10.1023/a:1018565428355
发表时间：
1997-08-15
期刊：
JOURNAL OF MATERIALS SCIENCE LETTERS
影响因子：
--
作者：
Bamnolker, H;Nitzan, B;Margel, S
通讯作者：
Margel, S
影响因子：
8.6
作者：
Holland, BT;Blanford, CF;Stein, A
通讯作者：
Stein, A
影响因子：
3.3
作者：
Lyon, LA;Debord, JD;Serpe, MJ
通讯作者：
Serpe, MJ
影响因子：
8.6
作者：
Caruso, RA;Susha, A;Caruso, F
通讯作者：
Caruso, F