TY - JOUR
T1 - Silica coating of Zn2Al/4-hydroxy-3-methoxybenzoic acid nanocomposites via seeded polymerization technique
AU - El-Toni, Ahmed Mohamed
AU - Yin, Shu
AU - Sato, Tsugio
N1 - Funding Information:
This research was partially supported by the Ministry of Education, Culture, Sports, Science and Technology, a Grant-in-Aid for the COE project (Giant Molecules and Complex Systems 2004).
PY - 2005/1/15
Y1 - 2005/1/15
N2 - 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 (Zn 2Al-LDHs) by coprecipiation reaction. But deintercalation of organic molecules from Zn2 Al-LDHs, by the anion exchange reaction with carbonate ion, was observed. Therefore, Zn 2Al-LDH/4-hydroxy-3-methoxybenzoic acid is directly coated with silica by means of polymerization technique based on the Stöber method. Silica coating effectively depress the deintercalation of 4-hydroxy-3-methoxybenzoic acid from Zn2Al-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.
AB - 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 (Zn 2Al-LDHs) by coprecipiation reaction. But deintercalation of organic molecules from Zn2 Al-LDHs, by the anion exchange reaction with carbonate ion, was observed. Therefore, Zn 2Al-LDH/4-hydroxy-3-methoxybenzoic acid is directly coated with silica by means of polymerization technique based on the Stöber method. Silica coating effectively depress the deintercalation of 4-hydroxy-3-methoxybenzoic acid from Zn2Al-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.
KW - Coating
KW - Composites materials
KW - Optical properties
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U2 - 10.1016/j.matchemphys.2004.08.029
DO - 10.1016/j.matchemphys.2004.08.029
M3 - Article
AN - SCOPUS:7544243084
VL - 89
SP - 154
EP - 158
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
IS - 1
ER -