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- Tohru Okuzono, Masaru Kobayashi, Masao Doi
- Physical review. E, Statistical, nonlinear, and…
- 2009

Drying processes of polymer solutions on a solid substrate enclosed by bank are studied in the slow limit of the solvent evaporation. A simple model is proposed to examine the final shape of the film after drying. Analytical expressions of the final shape in terms of the initial parameters are obtained. It is shown that the craterlike and basinlike shapes… (More)

- Tadashi Kajiya, Wataru Kobayashi, Tohru Okuzono, Masao Doi
- The journal of physical chemistry. B
- 2009

We studied how the addition of surfactants alters the drying and film formation processes of polymer solution droplets with contact lines strongly fixed by bank structures. We found that even if the amount of surfactant is quite small, it drastically changes the final profile of the polymer film from a ringlike profile to a flat profile. This property is… (More)

- Tohru Okuzono, Kin'ya Ozawa, Masao Doi
- Physical review letters
- 2006

A simple model is proposed for the skin formation in the evaporation process of a polymer solution at a free surface. In this model the skin is regarded as a gel phase formed near the free surface, and the dynamics is described by a diffusion equation for the polymer concentration with moving boundaries. The equation is solved both analytically and… (More)

- Akiko Toyotama, Tohru Okuzono, Junpei Yamanaka
- Scientific reports
- 2016

Crystallization of colloids has extensively been studied for past few decades as models to study phase transition in general. Recently, complex crystal structures in multi-component colloids, including alloy and eutectic structures, have attracted considerable attention. However, the fabrication of 2D area-filling colloidal eutectics has not been reported… (More)

- Koki Yoshizawa, Akiko Toyotama, Tohru Okuzono, Junpei Yamanaka
- Soft matter
- 2014

Uniformly shaped, charged colloidal particles dispersed in water form ordered "crystal" structures when the interaction between the particles is sufficiently strong. Herein, we report the behavior of "impurity" particles, whose sizes and/or charge numbers are different from those of the bulk, on addition to the charged colloidal crystals. These impurities… (More)

- Yuki Nakamura, Manami Okachi, Akiko Toyotama, Tohru Okuzono, Junpei Yamanaka
- Langmuir : the ACS journal of surfaces and…
- 2015

We report on the controlled clustering of oppositely charged colloidal particles by the adsorption of ionic surfactants, which tunes charge numbers Z of particles. In particular, we studied the heteroclustering of submicron-sized polystyrene (PS) and silica particles, both of which are negatively charged, in the presence of cetylpyridinium chloride (CPC), a… (More)

- Tohru Okuzono, Takao Ohta
- Physical review. E, Statistical, nonlinear, and…
- 2003

A model of phase separation of chemically reactive ternary mixtures is constructed. In this model, spatially periodic structures that coherently propagate at a constant speed emerge through a Hopf bifurcation at a finite wave number. It is shown by computer simulations that both lamellar and hexagonal structures undergo a coherent propagating motion in two… (More)

- Singo Sugiura, Tohru Okuzono, Takao Ohta
- Physical review. E, Statistical, nonlinear, and…
- 2002

We investigate the effect of temporal modulation on the spatiotemporal patterns produced by phase separation in chemically reactive ternary mixtures. The temporal modulation is introduced by making one of the reaction rates periodic in time. Our main concern is the stability of traveling waves, which appear above a Hopf-type bifurcation at a finite wave… (More)

- Tohru Okuzono, Takao Ohta
- Physical review. E, Statistical, nonlinear, and…
- 2001

An alternative model of phase-separating reactive mixtures is proposed. In this model both phase separation and chemical reactions simultaneously take place and a traveling coherent structure can be formed through a Hopf bifurcation at a finite wave number. Numerical simulations show that, depending on the parameters, either lamellar or hexagonal structures… (More)

- Koki Yoshizawa, Tohru Okuzono, Tsuyoshi Koga, Tomohiro Taniji, Junpei Yamanaka
- Langmuir : the ACS journal of surfaces and…
- 2011

We examine the spatial distribution of fluorescent-labeled charged polystyrene (PS) particles (particle volume fraction ϕ = 0.0001 and 0.001, diameter d = 183 and 333 nm) added to colloidal crystals of charged silica particles (ϕ = ϕ(s) = 0.035-0.05, d = 118 nm). At ϕ(s) = 0.05, the PS particles were almost randomly distributed in the volume-filling… (More)