Preparation of Tunable Colloidal Crystals Based on Temperature-sensitive Hydrogel

Chem. J. Chinese Universities

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Preparation of Tunable Colloidal Crystals Based on Temperature-sensitive Hydrogel

ZHENG Da, SUN Li-Guo, XIE Zhuo-Ying, XIONG Gui-Rong, XU Hua, GU Zhong-Ze*

State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China

Received:2007-11-02 Revised:1900-01-01 Online:2008-03-10 Published:2008-03-10
Contact: GU Zhong-Ze

Abstract

Abstract: Wet type colloidal crystals were fabricated on the temperature-sensitive hydrogel PNIPAAm by dip-coating method. Optical properties of the colloidal crystals were controlled by taking advantage of the water-releasing effect of PNIPAAm. It is found that monodisperse spheres could form ordered three-dimensional structure on the surface of PNIPAAm by lifting hydrogel-coated substrate from latex suspension. The colloidal crystal on hydrogel exhibited a sharp reflection peak originating from the diffraction of light. By raising the temperature over 34 ℃, phase transition occurred for PNIPAAm. Accompanying with the phase transition, water in PNIPAAm was released to the colloidal crystal, which diluted the concentration of the spheres and increased the interparticle distance. As a result, the reflection peak shifted to the long wavelength side. Such a change can be recovered by decreasing the temperature.

Key words: Temperature-sensitive hydrogel, Colloidal crystal, Photonic crystal

CLC Number:

O631

TrendMD:

ZHENG Da, SUN Li-Guo, XIE Zhuo-Ying, XIONG Gui-Rong, XU Hua, GU Zhong-Ze*. Preparation of Tunable Colloidal Crystals Based on Temperature-sensitive Hydrogel[J]. Chem. J. Chinese Universities, doi: .

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Preparation of Tunable Colloidal Crystals Based on Temperature-sensitive Hydrogel

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