Determine apparent shell density for evaluation of hollow silica nanoparticle
Determine apparent shell density for evaluation of hollow silica nanoparticle
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DOI：
10.1016/j.colsurfa.2012.04.019
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
C. Takai;Hideo Watanabe;Takuya Asai;M. Fuji
中科院分区：
文献类型：
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作者：
C. Takai;Hideo Watanabe;Takuya Asai;M. Fuji
为了最大限度地发挥中空纳米粒子的优异性能，确定壳的物理性能非常重要，因为它直接影响最终产品的功能。在本研究中，使用聚苯乙烯（PS）珠模板，基于溶胶-凝胶反应制备了具有不同壳结构的空心二氧化硅纳米颗粒（HSNP）。作为物理性质，表观壳密度由比表面积和壳厚度确定。获得的HSNPs分为三种类型：(A)二氧化硅壳厚度相对较薄，并且在壳中清楚地识别出堆积颗粒的球形形状；(B)二氧化硅壳厚度与A型相似，但堆积颗粒的形状被识别为半圆形；(C)二氧化硅壳厚度较厚，并且在壳中看不到堆积颗粒，这由悬浮液pH和反应时间控制。 A、B、C型的表观壳密度在1.4-2.2g/cm3之间，并随着pH值和/或反应时间的增加而增加。这对于设计空心二氧化硅纳米粒子来说一定是有用的技术。
To maximize excellent property of hollow nanoparticles, it is important to determine physical property of shell because it directly affects functionality of the final product. In this study, hollow silica nanoparticles (HSNPs) with different shell structure were prepared based on sol–gel reaction using polystyrene (PS) beads template. As physical property, apparent shell density was determined using specific surface area and shell thickness. The obtained HSNPs were categorized into three types of (A) thickness of silica shell is relatively thin and spherical shape of the stacked particulates is clearly identified in the shell, (B) thickness of silica shell is similarly thin to type A, but shape of the stacked particulates is identified as half-round shape, and (C) thickness of silica shell is thick and the stacked particulates are not recognized in the shell, which were controlled by suspension pH and reaction time. Apparent shell density of types A, B, C appeared in the 1.4–2.2g/cm3and it increased with increase in pH and/or reaction time. This must be useful technique to design hollow silica nanoparticles.