Characteristics of silica-coated TiO2 and its UV absorption for sunscreen cosmetic applications
Characteristics of silica-coated TiO2 and its UV absorption for sunscreen cosmetic applications
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DOI：
10.1002/sia.2313
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发表时间：
2006-04-01
影响因子：
1.7
通讯作者：
Stevens, R
中科院分区：
文献类型：
--
作者：
Jaroenworaluck, A;Sunsaneeyametha, W;Stevens, R
纳米TiO2作为无机紫外线吸收剂广泛用于防晒化妆品中，可使光学透明膜应用于人体皮肤。已知TiO 2以三种晶体形式存在：金红石、板钛矿和金红石。金红石相通常用作防晒化妆品中的组分，因为其具有较高的紫外线吸收。可以将表面涂层添加到纳米TiO2以通过不同的光衍射机制增强其UV吸收。为此目的，在这项研究中，二氧化硅包覆的纳米二氧化钛。以钛酸四异丙酯（TIPT）为前驱体，采用水解法合成了纳米二氧化钛。煅烧过程后，纳米TiO2形成，随后其表面改性的涂层与正硅酸乙酯（TEOS）作为二氧化硅的来源。将相同的涂覆方法应用于纳米级商业TiO 2，以比较表面特性。通过透射电子显微镜（TEM）和能量色散分析（EDS）分别对所得到的包覆TiO2粉末进行了检查和分析。紫外可见光谱被用来研究涂层和未涂层的二氧化钛的差异和有效性。版权所有（C）2006约翰威利父子有限公司
Nanosized TiO2 is used extensively in sunscreen cosmetics as an inorganic UV absorber that can allow an optically transparent film to be applied to human skin. TiO2 is known to exist in three crystal forms: anatase, brookite and rutile. The rutile phase is generally used as a component in sunscreen cosmetics because of its higher UV absorption. A surface coating can be added to nanosized TiO2 to enhance its UV absorption by a different light diffraction mechanism. Silica-coated nanosized TiO2 is examined in this study for this purpose. The nanosized TiO2 has been synthesized using hydrolysis of tetra-isopropylorthotitanate (TIPT) as a precursor. After a calcination process, nanosized TiO2 was formed and subsequently its surface modified by coating with tetraethoxysilane (TEOS) as the source of the silica. The same coating method was applied to nanosized commercial TiO2, to compare the surface characteristics. The resulting powders of coated TiO2 were examined by transmission electron microscopy (TEM) and analyzed by energy dispersive analysis (EDS), respectively. UV-vis spectroscopy was used to study the differences and effectiveness of the coated and uncoated TiO2. Copyright (C) 2006 John Wiley & Sons, Ltd.