Drying dissipative structures of Chinese black ink on a cover glass and in a dish

Okubo, Tsuneo; Kimura, Hiroshi; Kojima, Toshinori; Hayakawa, Fumihiro; Shibata, Tetsuichi; Kimura, Kouji

doi:10.1007/s00396-004-1077-4

Cited by 65 publications

(15 citation statements)

References 22 publications

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“…Recently, whole processes of the convectional patterns have been studied experimentally [14][15][16][17][18][19][20][21]. These convectional patterns were observed often in the intermediate and even final step of the drying patterns [11][12][13][14][15][16][17][18][19], which supports the cooperation of the five processes, wetting, evaporation, convection, sedimentation, and solidification during the course of dryness.…”

Section: Introductionmentioning

confidence: 80%

Drying dissipative patterns of aqueous solution of poly(methacrylic acid) and its salt neutralized half

Okubo¹,

Hagiwara

Kitano

et al. 2015

Colloid Polym Sci

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Drying patterns of poly(methacrylic acid) (HPMA) and its salt neutralized half with sodium hydroxide (NaHPMA) were studied on a cover glass, a watch glass, and a glass dish. The patterns of HPMA and NaHPMA are compared with the previous observation of sodium salt of poly(methacrylic acid), NaPMA (Okubo et al. Colloid Polym Sci 287:1155-1165, 2009). HPMA and especially NaHPMA are hygroscopic, and only the macroscopic patterns were observed. However, microscopic patterns were not observed clearly especially for NaHPMA in the room atmosphere. The hygroscopy of the dried films was in the order NaPMA < HPMA < NaHPMA. Broad rings of HPMA formed only at the outside edge irrespective of polymer concentration. Simplified laurel crown-like patterns appeared on a cover glass, which supports the strong solute-substrate affinity. On the other hand, the broad ring size of NaHPMA decreased sharply at the lower polymer concentrations than the critical concentration, m*. The results of NaHPMA support that both the inter-solutes and solute-substrate affinity are rather weak, and the pattern size was determined with the excluded volume effects. Sharpness parameter, S, of the broad rings was in the order HPMA > NaHPMA > NaPMA.

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Section: Introductionmentioning

confidence: 80%

Drying dissipative patterns of aqueous solution of poly(methacrylic acid) and its salt neutralized half

Okubo¹,

Hagiwara

Kitano

et al. 2015

Colloid Polym Sci

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“…5.4, B). The spoke-line patterns with cell convections were observed formerly for the membranes of Chinese black ink on the surface of water by Terada et al [9][10][11][12]44 We call this n-Decyltrimethylammonium bromide 12TMAB…”

Section: Convectional Patternsmentioning

confidence: 97%

“…The convectional patterns, especially Terada cells, were observed directly in the initial course of drying of the Chinese black ink in a glass dish, 12 100% ethanol suspensions of colloidal silica spheres, 13 a cup of miso soup, 14 coffee, 15 black tea, 16 and colloidal crystals of poly (methyl methacrylate) (PMMA) spheres. 45,46 For the 100% ethanol suspensions of colloidal silica spheres, Terada celletype convectional flow was observed clearly with the naked eye, and the convectional patterns changed dynamically toward the sedimentary patterns with time.…”

Section: Convectional Patternsmentioning

confidence: 99%

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Drying Patterns of Dispersions and Solutions

Okubo¹

2015

Colloidal Organization

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“…Recently, whole processes of the convectional patterns have been clarified experimentally [9][10][11][12][13]. Theoretical studies of the convectional patterns have been reported mainly using Navier-Stokes equations [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Drying dissipative structures of thermo-sensitive gel spheres of poly(N-isopropylacrylamide). Influence of degree of cross-linking of the gels

Okubo¹,

Suzuki

Tsuchida

2012

Colloid Polym Sci

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Drying dissipative patterns of de-ionized suspensions (colloidal crystal state above the critical concentrations of crystallization) of the thermo-sensitive gels of poly (N-isopropylacrylamide) with degrees of cross-linking of and pNIPAm(200-2)) were observed at 20°C and 45°C on a cover glass, a watch glass, and a Petri glass dish. The broad rings were observed, and their size decreased as micro-gel concentration decreased. Formation of the monodispersed agglomerated particles and their ordered arrays were observed. Microscopic drying structures of (a) flickering ordered spoke-lines, (b) ordered rings, (c) net structure, and (d) lattice-like ordered structures of the agglomerated particles are observed. The net and lattice structures formed more favorably at high degrees of cross-linking, at high concentrations of the gels, and/or high temperatures. By the addition of sodium chloride, very large dendrite-like and net structures of the large agglomerated particles formed at 20°C and 45°C, respectively. Importance of the cooperated convectional flow of the agglomerated particles during the drying processes is supported for the ordered array formation. The role of the electrical double layers around the agglomerated particles and the interaction of the particles with the substrate surfaces during dryness are also important for the ordering. The microscopic drying patterns of gel spheres were different from those of linear type polymers and also from typical colloidal spheres, though the macroscopic patterns of gel system such as broad ring formation at the edges of the dried film were similar to other two systems.

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Drying dissipative structures of Chinese black ink on a cover glass and in a dish

Cited by 65 publications

References 22 publications

Drying dissipative patterns of aqueous solution of poly(methacrylic acid) and its salt neutralized half

Drying dissipative patterns of aqueous solution of poly(methacrylic acid) and its salt neutralized half

Drying Patterns of Dispersions and Solutions

Drying dissipative structures of thermo-sensitive gel spheres of poly(N-isopropylacrylamide). Influence of degree of cross-linking of the gels

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