Rheo-optical study of colloidal crystals

Literature Information

Publication Date 2002-04-22
DOI 10.1039/B109963A
Impact Factor 3.676
Authors

Tsuneo Okubo, Hiroshi Kimura, Tohru Hatta, Takaharu Kawai


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Abstract

The relationship between rheological (macroscopic) and optical (microscopic) properties has been measured simultaneously for the colloidal crystals of silica spheres in exhaustively deionized aqueous suspensions. Shear stress of colloidal crystals increases linearly as strain increases, which supports the fact that the colloidal crystals are elastic. In the range of large strains, the crystals show the yielding and flow resulting in a constant value of shear stress irrespective of strain. The intersphere spacing estimated from the peak wavelength is insensitive to the small strain applied, however, it decreases approaching a constant value when the strain further increases. These results support the fact that the crystals are deformed slightly but keep their original form of single crystals by the shear at small strains. However, the sliding of the lattice planes may occur accompanied with the deformation of the electric double layer from spherical to flame-like. Furthermore, partial melt of the crystal structure occurs when the shear rate is high enough, which is confirmed from a decrease in the peak intensity in the reflection spectra.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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