Super water-repellent poly(alkylpyrrole) films having environmental stability

Kurogi, Kazutomo; Yan, Hu; Mayama, Hiroyuki; Tsujii, Kaoru

doi:10.1016/j.jcis.2006.07.052

Cited by 50 publications

(33 citation statements)

References 33 publications

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“…However, it has been clarified recently that the fractal is also fruitful in material designs. For instance, fractal surface structures emerge super-water repellency [8][9][10][11][12][13][14] and super oil-repellency [15]. The super water-repellent fractal structure is spontaneously formed on the surfaces of alkylketene dimer (AKD) and triglycerides waxes [8][9][10][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Characterization and structural investigation of fractal porous-silica over an extremely wide scale range of pore size

Ono

Mayama

Furó

et al. 2009

Journal of Colloid and Interface Science

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We have succeeded in creating Menger sponge-like fractal body, i.e., porous-silica samples with Menger sponge-like fractal geometries, by a novel template method utilizing template particles of alkylketene dimer (AKD) and a sol-gel synthesis of tetramethyl orthosilicate (TMOS). We report here the first experimental results on characterization and structural investigations of the fractal porous-silica samples prepared with various conditions such as calcination temperature and packing condition of the template particles. In order to characterize the fractal porous-silica samples, pore volume distribution, porosity and specific surface area were measured over an extremely wide scale from 1 nm to 100 m by means of mercury porosimetry, 1 H NMR cryoporometry, and nitrogen gas adsorption experiments together with direct evaluations of cross-sectional fractal dimension D cs , size limits of D cs . We have found that the pore volume distribution and specific surface area of the fractal porous-silica samples can be discussed in terms of different fractal porous structures at different scale regions.

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Section: Introductionmentioning

confidence: 99%

Characterization and structural investigation of fractal porous-silica over an extremely wide scale range of pore size

Ono

Mayama

Furó

et al. 2009

Journal of Colloid and Interface Science

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“…8 The excellent liquid-repellency is simply caused by the 'needle'-like morphology or fractal structure of the film surface. 7 The films have been mainly studied from the viewpoint of the liquid-repellency and its relevant properties. Poly(alkylpyrrole), however, can be considered as a kind of conductive polymers based on the nature of the molecular structure.…”

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confidence: 99%

“…6 The films were extensively studied in terms of water or oil-repellencies. [6][7][8] The surface structures of the films have mathematically fractal dimension of 2.2, based on analysis by a box-counting method.6,7 Such kind of solid surfaces with fractal structure interestingly influenced the cell cultures, which may provide potential biological applications. …”

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confidence: 99%

“…[6][7][8] The polymer films show super water-repellency, 6,7 and those coated with fluorinated compound by a facile way have very high oil-repellency. 8 The excellent liquid-repellency is simply caused by the 'needle'-like morphology or fractal structure of the film surface.…”

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confidence: 99%

“…[6][7][8] The surface structures of the films have mathematically fractal dimension of 2.2, based on analysis by a box-counting method. 6,7 Such kind of solid surfaces with fractal structure interestingly influenced the cell cultures, which may provide potential biological applications. 9 Ones can easily consider this polymer as a kind of conductive polymers simply because the polymer chains are the same with that of well-known conductive polymer of polypyrrole.…”

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Poly(1-n-octadecylpyrrole) Films with ‘Needle’-like Morphology

Yan

Hattori

Fujisato

et al. 2007

Polym J

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Electrochemical polymerization can provide conductive polymer films with various morphologies according to the reaction conditions. Therefore, the electrochemical polymerization was extensively studied using various kinds of monomers.1 Recently conductive polymers with unique shapes or their films with unique morphologies attract much attention due to their unique physical properties.2,3 Polypyrrole microtubes form during such electrochemical polymerization. 4 The formed microtubes show unique properties, such as incandescence and extremely high thermal stability of the tube-shape. 5Very recently, poly(alkylpyrrole) films with unique morphology were synthesized using a two-electrode electrochemical cell. [6][7][8] The polymer films show super water-repellency, 6,7 and those coated with fluorinated compound by a facile way have very high oil-repellency. 8 The excellent liquid-repellency is simply caused by the 'needle'-like morphology or fractal structure of the film surface. 7 The films have been mainly studied from the viewpoint of the liquid-repellency and its relevant properties. Poly(alkylpyrrole), however, can be considered as a kind of conductive polymers based on the nature of the molecular structure. Herein we report the synthesis of the polymer films using a three-electrode electrochemical cell, focusing on the optimum applied potential against reference electrode, Ag/AgCl. We also report electrochemical and electrical properties of thus-synthesized polymer films, and discuss the formation process of the 'needle'-like morphology.The poly(1-n-octadecylpyrrole) films were synthesized using three-electrode setup, in which indium-tin oxide (ITO) glass, platinum net, and Ag/AgCl were used as a working, counter, and reference electrode, respectively. The typical synthetic procedure was as follows: An acetonitrile solution of 1-n-octadecylpyrrole (5 mmol dm À3 ) and sodium p-toluenesulfonate (0.5 mmol dm À3 ) was electrochemically polymerized in a three-electrode cell at 9,000 mV vs. Ag/AgCl for 1 h. The polymer films were washed with acetonitrile and distilled water, and finally dried in vacuum overnight. The dried films were used for scanning electron microscopic (SEM), cyclic voltagramic (CV), and electrical conductivity measurements.SEM images of the films were obtained after gold-sputtering. CV curves were recorded using the films as a working electrode in an acetonitrile solution of sodium p-toluenesulfonate (0.5 mmol dm À3 ). Electrical conductivity of the films was measured by a conventional four-point technique.The poly(1-n-octadecylpyrrole) films were previously synthesized in a two-electrode cell. 6 The films were extensively studied in terms of water or oil-repellencies. [6][7][8] The surface structures of the films have mathematically fractal dimension of 2.2, based on analysis by a box-counting method.6,7 Such kind of solid surfaces with fractal structure interestingly influenced the cell cultures, which may provide potential biological applications. 9Ones can easily consider this polymer as a ki...

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