Preparation of Thermo-sensitive Nano Capsules by Using AOT Reverse Micellar Method

• Published in: Funtai Kogakkaishi Vol. 44; no. 9; pp. 658 - 663
• Main Authors: Kiyoyama, Shiro, Minamihata, Kosuke, Shiomori, Koichiro, Yoshizawa, Hidekazu, Yoshida, Masahiro, Hatate, Yasuo
• Format: Journal Article
• Language: English
• Published: The Society of Powder Technology, Japan 2007
• Subjects: AOT reverse micelle; In-situ polymerization; Nano capsule; Palladium release property; Thermo-sensitive
• ISSN: 0386-6157; 1883-7239
• DOI: 10.4164/sptj.44.658

We report on the preparation of thermo-sensitive nano capsules using AOT reverse micellar method. Poly-N-isopropyl acryl amide that is thermo-sensitive material was prepared by AOT reverse micellar method, and we coat it by in-situ polymerization of divinylbenzene. Effect of preparation conditions on the nano capsule morphology, encapsulation efficiency of core meterial and release characteristics for temperature alteration were investigated. The morphology of nano capsules was globular shape and their diameter was affected by AOT concentration and divinylbenzene concentration. The encapsulation efficiency of core material was affected by the AOT concentration, the polymerization time of poly-n-isopropyl acryl amide and the DVB concentration. The encapsulation efficiency of core material was well correlated to the encapsulation efficiency of water. The release characteristic of core material from the thermo-sensitive nano capsules was significant over the phase transition temperature of poly-n-isopropyl acryl amide. These results confirm that the preparation method of thermo-sensitive nano capsules described in the present study is a novel and effective preparation method of nano capsules.