Effect of roughness as determined by atomic force microscopy on the wetting properties of PTFE thin films

Miller, Jan D.; Veeramasuneni, S.; Drelich, Jaroslaw; Yalamanchili, M.R.; Yamauchi, Goro

doi:10.1002/pen.10580

Cited by 243 publications

(149 citation statements)

References 20 publications

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“…Although currently superhydrophobic surfaces are inspired by biological specimens, [80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97] the early research was inspired by the practical need to enhance coating repellency of water and snow. 98,99 These days, superhydrophobic coatings are manufactured by chemical, physical and/or mechanical modifications of both organic and inorganic materials. 69,[100][101][102][103][104][105][106][107][108][109][110][111][112][113] The opposite term of superhydrophobic is superhydrophilic, defined in the previous contribution.…”

Section: 78mentioning

confidence: 99%

“…One of the first companies, if not the first one, working on commercial superhydrophobic coatings was NTT in Japan, where one of us had the privilege to work with in the middle of 1990s. 98,99 Their spray that contained polytetrafluroethylene particles and a binder was specifically designed for antennas and other transmission systems, particularly located at a high elevation, to reduce the accumulation of snow (Figure 7). …”

Section: Self-cleaning (Superhydrophobic) Product Coatingsmentioning

confidence: 99%

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Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Drelich

Marmur

2014

Surface Innovations

156

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The terms superhydrophobicity and superhydrophilicity were introduced not very long ago, in 1996 and 2000, respectively.The former is used to describe exceptionally weak and the latter used to indicate strong interactions of materials and IntroductionAfter more than two centuries of research, capillarity and wetting phenomena still remain popular topics of investigation in many modern surface chemistry laboratories. Curiosity and fascination with rain droplets splashing in a puddle, water droplets decorating flowers, leaves of plants and fruits after rain or watering and colorful soap bubbles shaped at the end of wheat straw have never been stronger and go beyond scientific laboratories. Colorful images of liquid droplets and puddles, illustrating their behavior on a variety of surfaces, thrive in professional journals, popular magazines and Internet. However, terms such as wetting, spreading and contact angle are still puzzling to the layman and beginner researcher. To facilitate

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Section: 78mentioning

confidence: 99%

Section: Self-cleaning (Superhydrophobic) Product Coatingsmentioning

confidence: 99%

Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Drelich

Marmur

2014

Surface Innovations

156

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“…With sufficient sensitivity in the spring deflection sensor, the tip can reveal surface profiles with nanometer scale resolution. 22 Three kinds of operation modes (contact, noncontact, and tapping) can be applied to different materials. AFM offers unique features: high magnification with high resolution, minimal sample preparation, and the ability to detect atomicscale defects and obtain two-dimensional or three-dimensional images of the sample from a single data collection.…”

Section: Introductionmentioning

confidence: 99%

Porcelain Refinishing with Two Different Polishing Systems after Orthodontic Debonding

Karan

Toroğlu

2008

The Angle Orthodontist

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Objective:To compare the effects of two polishing systems on the surface roughness of three types of porcelain after orthodontic debonding. Materials and Methods: A total of 90 porcelain discs were fabricated from feldspathic (n ϭ 30), leucite-based (n ϭ 30) or lithia disilicate-based (n ϭ 30) ceramics. Ten samples in each group served as the control and received no surface treatment. The remaining 60 samples in three of the porcelain groups were bonded with lower incisor brackets and debonded using a testing machine in shear mode at a rate of 1 mm/minute crosshead speed. After debonding, the remaining adhesive resin was removed with a tungsten carbide bur. Then, two experimental subgroups (10 each) in each porcelain group were treated as follows: in the first subgroup, porcelain polishing wheel and polishing paste were applied, whereas in the second, polishing was performed using a series of Sof-Lex discs. The average surface roughness (Ra) of the all samples was evaluated using SPM/AFM (surface probe microscope/atomic force microscope). Data were statistically analyzed by analysis of variance for each porcelain material and polishing method. Results: The polishing techniques affected surface roughness significantly. There were significant differences between the groups; higher Ra values were obtained with the use of porcelain polishing wheel and polishing paste (P Ͻ .001). Conclusion:The application of Sof-Lex discs can produce smoother porcelain surfaces than porcelain polishing wheel and polishing paste.

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“…Estudos mostraram que o aumento da rugosidade na superfície de um polímero após o recobrimento por plasma pode ser resultado da diferença das taxas de erosão, causada pelo bombardeamento de íons, entre as regiões amorfas e cristalinas do polímero [20] . Mais recentemente, foi demonstrado que a rugosidade da superfície de filmes depositados por plasma contribuíram para a obtenção de filmes ultra-hidrofóbicos [21][22][23] .…”

Section: Resultsunclassified

Redução da hidrofilicidade de filmes biodegradáveis à base de amido por meio de polimerização por plasma

et al. 2004

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Resumo: Devido ao baixo custo de produção e excelente biodegradabilidade, o amido constitui-se em matéria-prima promissora para a produção de plásticos biodegradáveis. No entanto, a grande hidrofilicidade dos filmes à base de amido representa uma séria limitação tecnológica à sua comercialização, uma vez que as propriedades dos filmes são afetadas pela variação da umidade relativa do ar durante a sua estocagem ou o seu uso. Neste trabalho, filmes de amido termoplástico foram recobertos com uma fina camada protetora polimérica gerada por intermédio da tecnologia de plasma frio. 1-Buteno e 1,3-butadieno foram utilizados como monômeros para a polimerização por plasma. Os filmes recobertos apresentaram uma redução de até 80% na absorção de água e aumento do ângulo de contato em relação à água. Estes resultados indicaram uma redução significativa na natureza hidrofílica do material à base de amido após o recobrimento. Palavras-chave: Amido termoplástico, deposição por plasma, microscopia de força atômica, hidrofilicidade. Reduction of Hydrophilicity of Biodegradable Starch-Based Films by Plasma PolymerizationAbstract: Due to low cost and excellent biodegradability, the use of starch as a raw material for bioplastic production is growing in interest. However, the properties of starch-based materials are affected by relative humidity during their use and storage due to their hydrophilic character. In this work, thermoplastic cornstarch films were coated by cold plasma technology with a protective thin layer in order to reduce water sensitivity. 1-Butene and 1,3-butadiene were used as monomers for plasma polymerization. Coated films presented a reduction of water absorption up to 80% an increase in contact angle related to water. These results indicated that the coating process reduced significantly the hydrophilic nature of the starch-based materials.

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Effect of roughness as determined by atomic force microscopy on the wetting properties of PTFE thin films

Cited by 243 publications

References 20 publications

Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Porcelain Refinishing with Two Different Polishing Systems after Orthodontic Debonding

Redução da hidrofilicidade de filmes biodegradáveis à base de amido por meio de polimerização por plasma

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