Citation: Yong Qiang He, Xiao Dong Wang, Jian Ying Wang, Yan Feng, Yong Qiang Zhao, Xiu Dong You. PAM-PAA microgel inverse opal photonic crystal and pH response[J]. Chinese Chemical Letters, ;2007, 18(11): 1395-1398. doi: 10.1016/j.cclet.2007.09.010 shu

PAM-PAA microgel inverse opal photonic crystal and pH response

a School of Science, Tianjin University, Tianjin 300072, China;
b Insititute of Medical Equipment, Academy of Military Medical Sciences, Tianjin 300161, China

Received Date: 31 May 2007

Fund Project: The authors are thankful to those who in the Analytic Center of Tianjin University for SEM tests.This work is financially supported by the National Natural Science Foundation of China (No.50473044).

The colloidal crystal template or opal with a closed-packed face-centered cubic (fcc) lattice was prepared from monodisperse polystyrene (PS) spheres by vertical sedimentation. The template provided void space for infiltration of monomer precursor composed of acrylate acid, acrylamide and ammonium persulfate, as well as microgel from the subsequent copolymerization. The sample was immersed in dimethylbenzene for completely removing PS spheres to form PAM inverse opal hydrogels (IOH_PAM) or PAM/PAA inverse opal hydrogels (IOH_PAM/PAA) photonic crystals. The PS spheres were replaced by air spheres, which interconnected each other through the windows. The study of responses to pH show that there are two peaks for both IOH_PAM and IOH_PAM/PAA films, but the IOH_PAM/PAA peaks shift to higher pH, and the peaks are independent with the AA content.
- Photonic crystal,
- pH response,
- PAM/PAA,
- Opal,
- Inverse opal hydrogel
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