Effect of spreading pressure on surface free energy determinations by means of contact angle measurements

Busscher, Henk J.; Pelt, A. W. J. van; Jong, H. P. de; Arends, J

doi:10.1016/0021-9797(83)90067-x

Cited by 149 publications

(65 citation statements)

References 14 publications

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“…The mean value was used to calculate surface tension of the bacterial isolates. Polar and non-polar components of the surface tension were calculated by using a geometric mean approach and Young's equation (2,3,12):…”

Section: Methodsmentioning

confidence: 99%

Hydrophobicity of the cells of fast- and slow-growing bacteria isolated from a grassland soil.

Kasahara

Morisaki

Hattori

1993

J. Gen. Appl. Microbiol.

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The cell surface tension of 250 strains of bacteria isolated from grassland soil was examined by measuring the contact angle of a liquid droplet on the cell layer. The values of the contact angle of aqueous 0.1 M NaCI solution and a-bromonaphthalene on the cell layer were used to calculate the polar and non-polar components of surface tension for the isolates.The polar component of the "slow-growing" isolates was smaller than that of the "fast-growing" isolates.On the other hand, no difference could be observed in the non-polar component between the fast-and slow-growing isolates.These results indicate that slow-growing isolates have more hydrophobic cell surface than fast-growing isolates.

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Section: Methodsmentioning

confidence: 99%

Hydrophobicity of the cells of fast- and slow-growing bacteria isolated from a grassland soil.

Kasahara

Morisaki

Hattori

1993

J. Gen. Appl. Microbiol.

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“…This is an intrinsic property that depends on the type of bonding at the interface. The true work of adhesion can be determined by contact angle measurements [3][4][5][6][7] and atomistic simulations [8] . Contamination can affect the true work of adhesion [7,9].…”

Section: Definition Of Adhesion and Delaminationmentioning

confidence: 99%

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Chen¹,

Bull²

2010

J. Phys. D: Appl. Phys.

124

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The fundamental property which often dictates the performance of a coating is its adhesion to the substrate and thus there are many techniques to measure adhesion. The choice of methods is dependent on many factors such as the mechanical properties of the coating and substrate, the interface properties, the microstructure of the coating/substrate system, residual stress, coating thickness and the intended application. Most tests aim to introduce a stable interfacial crack and make it propagate under controlled conditions and model this process to determine adhesion. The corresponding models are either stress analysis-based or energy-based. With the advent of miniature systems and very thin functional coatings, there is a need for characterization of adhesion at small length scales and some specific tests have been developed which are not appropriate for thicker coatings. Among these, indentation and scratch methods have the widest range of applicability but it is necessary to analyse the failure mechanisms before choosing an appropriate model to extract adhesion parameters. This paper reviews the main quantitative adhesion tests for coatings and highlights the tests which can be used to assess submicrometre coatings and thin films. The paper also highlights the modelling and analysis methods necessary to extract reliable adhesion properties illustrating this with examples for submicrometre coatings on silicon and architectural glass.

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“…They were fluorethylenepropylene copolymer (FEP) (Fluorplast, Raamsdonkveer, The Netherlands (ys = 20 mJ m-2), cellulose acetate (Hawe Neos Dental, Gentilino, Switzerland) (ys = 58 mJ m-2) and glass (microscope slides, Menzel, FRG) (ys = 109 mJ m-2). For details of the determination of surface free energy of solid surfaces see Busscher et al (1983).…”

Section: H Pratt-terpstra a N D Othersmentioning

confidence: 99%

Adhesion of Oral Streptococci from a Flowing Suspension to Uncoated and Albumin-coated Surfaces

Pratt-Terpstra

Weerkamp²,

Busscher³

1987

Microbiology

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A flow cell system was developed which allowed the study of bacterial adhesion to solid substrata at well-defined shear rates. In addition, the system enabled the solid surfaces to be coated with a proteinaceous film under exactly the same shear conditions. In this flow cell system, adhesion of three strains of oral streptococci from a phosphate-buffered solution onto three different substrata was studied as a function of time in the absence and presence of a bovine serum albumin (BSA) coating at a shear rate of 21 s-'. To obtain a wide range in surface free energies (y) representative strains (Yb 38-1 17 mJ m-2) and solid substrata (y, 20-109 mJ m-') were selected. The number of bacteria adhering was counted microscopically. In the absence of a BSA coating a linear relation was found between the number of bacteria adhering at saturation (nb.,) and the calculated interfacial free energy of adhesion (AFadh) for each of the three strains. In the presence of a BSA coating the number of bacteria adhering was greatly decreased in all cases. However, despite the presence of the BSA coating there was still a linear relation between the number of bacteria adhering at saturation and the interfacial free energy of adhesion, calculated on the basis of the surface free energy of the uncoated substrata. It can be concluded that the bare, uncoated substratum still influenced bacterial adhesion in spite of the marked influence of a BSA coating.

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Effect of spreading pressure on surface free energy determinations by means of contact angle measurements

Cited by 149 publications

References 14 publications

Hydrophobicity of the cells of fast- and slow-growing bacteria isolated from a grassland soil.

Hydrophobicity of the cells of fast- and slow-growing bacteria isolated from a grassland soil.

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Adhesion of Oral Streptococci from a Flowing Suspension to Uncoated and Albumin-coated Surfaces

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