Investigation on Colloidal Crystals Fabricated by Rapid Self-assembly of Monodispersed Cross-linked Carboxy-modified Polymer Microspheres

Abstract

Abstract: By means of vertical deposit method on several kinds of substrates, mondispersed cross-linked-carboxy modified polymer microspheres were self assembled into colloidal crystals rapidly in the temperature range of 20_70 ℃. The colloidal crystals fabricated by the polymer microspheres with different diameters show different stop-bands due to the Bragg diffraction. The relationship between the stop-band of colloidal crystals and the diameters of polymer microspheres were investigated by using UV-Vis spectra. Experiments had proved that the stop band red-shefted with increasing the diameters of the polymer microspheres, while blue-shifted with the increasing of the incidence angle. It was studied that the effects of pH value and other factors on the self-assembly of these polymer microspheres by SEM and AFM. We found that the polymer microspheres could form colloidal crystals in a broad range of pH value from³.0 to 13.0, which was mainly based on the fact that the microspheres can change their surface properties by turning carboxy groups to their corresponding ions at different pH values. The property of these microspheres could manipulate the interactions among themselves in the self-assembly procedure, leading to the above results.

Key words: Carboxy-modified polymer microsphere, Vertical deposition method, Rapid self-assembly, Colloidal crystal

CLC Number:

O631

TrendMD:

CHEN Zhi-Min, CHEN Xin, ZHANG Kai, CUI Tie-Yu, CUI Zhan-Chen, YANG Bai . Investigation on Colloidal Crystals Fabricated by Rapid Self-assembly of Monodispersed Cross-linked Carboxy-modified Polymer Microspheres[J]. Chem. J. Chinese Universities, 2004, 25(3): 560.

References

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