LbL‐coated microcapsules as systems for encapsulation of optical brightening agent

Wiley - Tập 127 Số 3 - Trang 1609-1614 - 2013
Jasaswini Tripathy1, Ashok M. Raichur2,1
1Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
2Department of Chemical Technology, University of Johannesburg, Doomfontein 2028, South Africa

Tóm tắt

AbstractWe report the encapsulation of optical brightening agent (OBA) into hollow microcapsules prepared by the controlled Layer‐ by‐Layer (LbL) self‐assembly process, achieved by the sequential adsorption of oppositely charged polyelectrolytes using negatively charged silica template. Loading takes place by spontaneous deposition method which was proved by confocal laser scanning microscopy (CLSM) using rhodamine 6G (Rd6G) as a fluorescent probe. The loading of the OBA into the microcapsules was found to be dependent on the feeding concentration, pH of the medium, and loading temperature. The encapsulation efficiency of OBA decreased on increasing feeding concentration. Maximum loading was observed at pH 4 and amount of OBA loaded decreased with increase in pH. The loaded OBA was released in a sustained manner for 8 h. No degradation of the OBA was observed during the process of encapsulation and release. Polyelectrolyte capsules potentially offer an innovative way of encapsulating large amounts of active materials for a variety of applications. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Wiley

Tập 127 Số 3

1609-1614

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