Understanding adhesion: A means for preventing fouling

Oliveira, Rosário

doi:10.1016/s0894-1777(96)00134-3

Cited by 165 publications

(106 citation statements)

References 25 publications

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“…surface charge and hydrophobicity [23]. Moreover, ionic strength determines the thickness of the electrical double layer which has a direct influence on electrostatic interactions established in the adhesion events [24]. Thus, it is expected that artificial saliva, which has a high ionic strength, influences adhesion to oral surfaces, lowering the electrostatic repulsion.…”

Section: Discussionmentioning

confidence: 99%

Adhesion of Candida albicans and Candida dubliniensis to acrylic and hydroxyapatite

Henriques

Azeredo

Oliveira

2004

Colloids and Surfaces B: Biointerfaces

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The aim of this work was to compare the ability of strains of Candida albicans and Candida dubliniensis to adhere to acrylic and hydroxyapatite (HAP). In order to interpret the adhesion results, the surface properties of cells and materials were determined. Surface tension components (polar and apolar) and hydrophobicity were calculated through contact angle measurement and the elemental composition was determined by X-ray photoelectron spectroscopy (XPS). The results showed no significant differences in the number of adhered cells of both species to acrylic and hydroxyapatite. This was corroborated by the similarities in their surface properties and elemental composition. For both species, the adhesion to acrylic increased in the presence of artificial saliva due to the increase in the electron-donor capacity of this material. In the absence of artificial saliva, the number of adhered cells to HAP was greater than to acrylic, on account of the higher number of electron-donor groups of HAP. Hydrophobicity played a minor role in the adhesion process of both candidal species. Conversely, Lewis acid-base interactions seamed to govern this phenomenon.

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Section: Discussionmentioning

confidence: 99%

Adhesion of Candida albicans and Candida dubliniensis to acrylic and hydroxyapatite

Henriques

Azeredo

Oliveira

2004

Colloids and Surfaces B: Biointerfaces

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“…Van der Waals attractions and electrostatic double layer repulsion which is depending on the size, geometry and weight of the formed molecules (Oliveira 1997). In the deposition process, the attractive Van der Waals forces even for bigger and heavier molecules (e.g.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Surface inorganic scale formation in oil and gas industry: As adhesion and deposition processes

Vazirian

Charpentier

Penna

et al. 2016

Journal of Petroleum Science and Engineering

102

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Scale formation on surfaces can normally be divided into two distinct processes: a "deposition process" which refers to the process of heterogeneous nucleation and growth at the asperities of the surface and an "adhesion process" which refers to the sticking of preexisting crystals, which have nucleated in the bulk solution, and which build up as a layer on the surface. It has been presented in this paper that the surface scale formation rate is more dominantly controlled by the "deposition process" rather than the "adhesion process"; however, the level of agitation could have inverse effects on one process to another. Only a small amount of research has been done to understand the differences of the kinetics of each of these processes. The presented work represents an experimental study of scaling tests to assess the effect of hydrodynamic conditions, using Rotating Cylinder Electrode (RCE), in a complex scaling environment, particularly supersaturated with barium/strontium sulphate and calcium carbonate, on the stainless steel substrate coated with a wide range of different industrial coatings.In addition, the effect of the surface energy and surface roughness on both processes has been studied. The paper provides data that will assist in the understanding of the controlling parameters in scale formation in different conditions, and also describes what characteristics of the surface can make it a good anti-scale surface for inorganic scale; however, the results have showed that merely one parameter cannot assure a surface as a good antifouling surface.

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“…This might be by design or due to eccentricity inherent within the system, as in the case of fluid film lubrication [3]. The surfaces involved may also feature additional complicating factors in the form of random surface asperities or welldefined surface patterning, which can occur either naturally or as a consequence or indeed requirement of a particular manufacturing process [4]. Manufactured functional surfaces arise across a broad swathe of engineering applications and have particular relevance with respect to lubricant friction problems [5], where regular surface patterning is being used increasingly to improve the performance of tribological components [6].…”

Section: Introductionmentioning

confidence: 99%

Eddy genesis and manipulation in plane laminar shear flow

et al. 2009

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Eddy formation and presence in a plane laminar shear flow configuration consisting of two infinitely long plates orientated parallel to each other is investigated theoretically. The upper plate, which is planar, drives the flow; the lower one has a sinusoidal profile and is fixed. The governing equations are solved via a full finite element formulation for the general case and semi-analytically at the Stokes flow limit. The effects of varying geometry (involving changes in the mean plate separation or the amplitude and wavelength of the lower plate) and inertia are explored separately. For Stokes flow and varying geometry, excellent agreement between the two methods of solution is found. Of particular interest with regard to the flow structure is the importance of the clearance that exists between the upper plate and the tops of the corrugations forming the lower one. When the clearance is large, an eddy is only present at sufficiently large amplitudes or small wavelengths. 1However, as the plate clearance is reduced, a critical value is found which triggers the formation of an eddy in an otherwise fully attached flow for any finite amplitude and arbitrarily large wavelength. This is a precursor to the primary eddy to be expected in the lid-driven cavity flow which is formed in the limit of zero clearance between the plates.The influence of the flow driving mechanism is assessed by comparison with corresponding solutions for the case of gravity-driven fluid films flowing over an undulating substrate.When inertia is present, the flow generally becomes asymmetrical. However, it is found that for large mean plate separations the flow local to the lower plate becomes effectively decoupled from the inertia dominated overlying flow if the wavelength of the lower plate is sufficiently small. In such cases the local flow retains its symmetry. A local Reynolds number based on the wavelength is shown to be useful in characterising these large-gap flows. As the mean plate separation is reduced, the form of the asymmetry caused by inertia changes, and becomes strongly dependent on the plate separation. For lower plate wavelengths which do not exhibit a kinematically induced secondary eddy, an inertially induced secondary eddy can be created if the mean plate separation is sufficiently small and the global Reynolds number sufficiently large.

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Understanding adhesion: A means for preventing fouling

Cited by 165 publications

References 25 publications

Adhesion of Candida albicans and Candida dubliniensis to acrylic and hydroxyapatite

Adhesion of Candida albicans and Candida dubliniensis to acrylic and hydroxyapatite

Surface inorganic scale formation in oil and gas industry: As adhesion and deposition processes

Eddy genesis and manipulation in plane laminar shear flow

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