Contact angles and the equilibrium spreading pressures of liquids on hydrophobic solids

Fowkes, Frederick M.; McCarthy, D. C.; Mostafa, Mohamed A.

doi:10.1016/0021-9797(80)90508-1

Cited by 141 publications

(60 citation statements)

References 25 publications

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“…Wetting liquids used for contact angle measurements were distilled water and MI, which were suggested by Owens and Wendt (12). The surface free energies of coating films were estimated by Fowkes's theory using the contact angle data (12,13). Total surface free energies and their polar and dispersion components were calculated by Fowkes's equation as follows, where p and d are the polar and dispersion components of each surface free energy, θ c is the contact angle, and γ SV and γ LV are the interfacial tensions at the solid-vapor and liquid-vapor interfaces, respectively.…”

Section: Characterization Of Coating Filmsmentioning

confidence: 99%

Preparation of Water-Repellent Glass by Sol–Gel Process Using Perfluoroalkylsilane and Tetraethoxysilane

Jeong

Kim

Lee

et al. 2001

Journal of Colloid and Interface Science

123

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Section: Characterization Of Coating Filmsmentioning

confidence: 99%

Preparation of Water-Repellent Glass by Sol–Gel Process Using Perfluoroalkylsilane and Tetraethoxysilane

Jeong

Kim

Lee

et al. 2001

Journal of Colloid and Interface Science

123

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“…5 The apparent work of adhesion (W ap ) is assumed as a combination of two components named Lifishitz-van der Waals (W ap-LW ) and acid-base (W ap-AB ). 15 The W ap-LW component is due to London or dispersion forces across the interface and also includes Keesom and Debye forces. The W ap-AB component is due to specific chemical interactions across solid-liquid interface, where hydrogen bonding is considered.…”

Section: Introductionmentioning

confidence: 99%

Effects of kraft pulping on the interfacial properties of Eucalyptus pulp fibres

Fardim¹,

Durán²

2005

J. Braz. Chem. Soc.

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Os efeitos da polpação kraft nas propriedades interfaciais da polpa de eucalipto brasileiro foram investigados usando titulação com polieletrólito (PT) e medidas de ângulo de contato. Mudanças na composição química da superfície foram avaliadas por espectrometria de reflexão total atenuada no infravermelho (FTIR-ATR), combinada com análise de componentes principais (PCA). O aumento do álcali ativo na polpação provocou a remoção de lignina da superfície, de acordo com FTIR-ATR e PCA. A carga superficial diminuiu enquanto a energia superficial e trabalho de adesão com a água (W ap ) aumentaram. O componente ácido-base (W ap-AB ) foi indentificado como o causador do aumento em W ap . Nossos resultados sugeriram que a remoção de lignina superficial combinada com a exposição de carbohidratos e mobilidade superficial de extrativos são as principais causas das modificações nas propriedades interfaciais geradas pela polpação kraft. A contribuição das propriedades superficiais no desenvolvimento de seqüências de branqueamento e novos produtos de polpa também foram discutidos.The effects of kraft pulping on the interfacial properties of eucalypt pulp fibres were investigated using polyelectrolyte titration (PT) and contact angle measurements. Changes on surface composition were assessed by FTIR-ATR spectrometry combined with principal component analysis (PCA). Surface lignin was removed by increase in active alkali in pulping as indicated by FTIR-ATR and PCA. In parallel, the surface charge decreased while the surface energy and work of adhesion with water (W ap ) increased. The acid-base component (W ap-AB ) explained the increase of W ap . Our results suggested that the removal of surface lignin, exposure of carbohydrates and surface mobility of extractives are the main contributors to modifications of interfacial properties by kraft pulping. The role of interfacial properties on development of bleaching sequences and new pulp products was also briefly discussed.

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“…The most widely used two components surface energy theory is due to Fowkes [10][11][12]. It suggests that the surface energy of a solid is a summation of two components, viz.…”

Section: Fowkes Approachmentioning

confidence: 99%

“…The Fowkes [10][11][12] and van Oss acid-base [13][14][15] approaches were followed for calculating the surface energy of solids. The Fowkes approach calculates the polar and non-polar dispersive components of surface energy.…”

Section: Surface E Nergetic Structure O F P Yrite After Tribo-chargingmentioning

confidence: 99%

Characterising Electron Transfer Mechanism in Tribo-Electrification of Pyrite Through Contact Angle Measurements

Dwari¹,

Rao²

2008

TOMPJ

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Abstract:Coal beneficiation by tribo-electrostatic method depends on tribo-charging attributes of coal and ash forming minerals. The tribo-electrification behaviour of pyrite mineral contacted with different materials has been investigated through charge measurements and the charge acquisition is probed through surface energy calculations from liquid contact angle data. Liquid contact angle on pyrite powder after tribo-electrification is determined by Krüss tensiometer using Washburn's equation. The sample holder in tensiometer is specially fabricated with different materials serving the purpose of tribo-electrification and contact angle measurement. The acid and base parameters of pyrite surface determined with van Oss acid-base approach using liquid contact angle data after tribo-electrification with different materials revealed the charging phenomena and electron transfer mechanism. The results showed an explicit correlation between the charge generated by pyrite powder and surface acceptor (acid)-donor (base) electronic state underlying the work functions of contacting surfaces. Thus a method for characterising the changes in surface energetic structure of solids during contact electrification in terms of surface acid-base parameters has been illustrated for the first time.

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Contact angles and the equilibrium spreading pressures of liquids on hydrophobic solids

Cited by 141 publications

References 25 publications

Preparation of Water-Repellent Glass by Sol–Gel Process Using Perfluoroalkylsilane and Tetraethoxysilane

Preparation of Water-Repellent Glass by Sol–Gel Process Using Perfluoroalkylsilane and Tetraethoxysilane

Effects of kraft pulping on the interfacial properties of Eucalyptus pulp fibres

Characterising Electron Transfer Mechanism in Tribo-Electrification of Pyrite Through Contact Angle Measurements

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