Silica coating of Zn2Al/4-hydroxy-3-methoxybenzoic acid nanocomposites via seeded polymerization technique

被引：20

作者：

El-Toni, AM ^{[1
]}

Yin, S ^{[1
]}

Sato, T ^{[1
]}

机构：

[1] Tohoku Univ, IMRAM, Sendai, Miyagi 9808577, Japan

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2005年 / 89卷 / 01期

关键词：

composites materials; coating; optical properties;

D O I：

10.1016/j.matchemphys.2004.08.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Organic ultraviolet (UV) rays absorbents have been used as sunscreen materials, but may pose a safety problem when used at high concentration. In order to prevent direct contact of organic UV-rays absorbent to the human skin a typical organic UV-absorbent, 4-hydroxy3-methoxybenzoic acid (HMBA) was intercalated into Zn2Al layered double hydroxide (Zn2Al-LDHs) by coprecipiation reaction. But deintercalation of organic molecules from Zn2Al-LDHs, by the anion exchange reaction with carbonate ion, was observed. Therefore, Zn(2)AILDH/4-hydroxy-3-methoxybenzoic acid is directly coated with silica by means of polymerization technique based on the Stober method. Silica coating effectively depress the deintercalation of 4-hydroxy-3-methoxybenzoic acid from Zn(2)AI-LDHs. The amorphous silica is confirmed by X-ray diffraction, scanning electron microscope and FT-IR. The deintercalation behavior as well as UV-shielding properties is investigated for coated particles. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：154 / 158

页数：5

共 23 条

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