Structural Characterizations of Charged Colloidal Crystals

DOI:10.15011/ijmsa.32.320205
Int. J. Microgravity Sci. Appl. 2015p320205
Author
C. KAKIHARA, A. TOYOTAMA, T. OKUZONO, J. YAMANAKA, K. ITO,T. SHINOHARA, M. TANIGAWA and I.S. SOGAMI
Organization
Faculty of Pharmaceutical Sciences, Nagoya City University, Faculty of Engineering, Toyama University, Gofuku, Toyama City, Faculty of Science, Kyoto Sangyo University
Abstract
We examined influences of the particle volume fraction φ and effective charge number Zeff on the crystal structures of charged colloids, by means of the reflection spectroscopy and Kikuchi-Kossel diffraction measurements. We employed dilute salt-free aqueous dispersions of charged polystyrene (PS) particles (the diameter d = 110 to 120 nm; Zeff = about 1300) and colloidal silica (d = 120 nm, Zeff = about 550). The PS colloids had the BCC structure at φ ≤ 0.01 and exhibited the structural phase transition into the FCC lattice on increasing φ. The silica colloids, which had lower Zeff, took the BCC structures at all φs examined (φ≤ 0.04).
Keyword(s)
charged colloidal crystal, BCC-FCC phase transition, reflection spectroscopy.
PDF
Download

Received 31 Dec. 2014, accepted 10 Mar. 2015, published 31 Apr. 2015

© The Japan Society of Microgravity Applicaiton

この投稿文は次の言語で読めます: Japanese

ページ先頭に戻る