UV-triggered encapsulation and release from polyelectrolyte microcapsules decorated with photoacid generators

被引:31
作者
Koo, Hye Young [2 ]
Lee, Ha-Jin [1 ]
Kim, Jun Kyung [2 ]
Choi, Won San [1 ,3 ]
机构
[1] Korea Basic Sci Inst KBSI, Jeonju Ctr, Jeonju 561756, South Korea
[2] Korea Inst Sci & Technol KIST, Bongdong Eup 565902, Jeollabuk Do, South Korea
[3] Chungnam Natl Univ, GRAST, Taejon 305764, South Korea
基金
新加坡国家研究基金会;
关键词
CAPSULES; MULTILAYERS; NANORODS; FILMS;
D O I
10.1039/b924282a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In the present study, a versatile layer-by-layer technique using polyelectrolyte multilayers (PEMs) was used to prepare microcapsules with walls containing photoacid generators (PAGs), which made them optically addressable. By exposure to UV light with a wavelength of 254 nm, the PAGs within the capsule walls were activated, which caused the release of protons from the capsules. This release of protons caused a decrease in the pH of the capsule solution, which then triggered a swelling of the microcapsules. The resulting microcapsules could be opened and closed via alternate repetition of exposure to UV light and washing with neutral water. Prolonged exposure led to a breakage of the capsules, which promoted a rapid release of the entrapped substances.
引用
收藏
页码:3932 / 3937
页数:6
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