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Matching the nano- to the meso-scale: measuring deposit–surface interactions with atomic force microscopy and micromanipulation

Akhtar, N.; Bowen, J.; Asteriadou, K.; Robbins, P. T.; Zhang, Z. and Fryer, P. J. (2010). Matching the nano- to the meso-scale: measuring deposit–surface interactions with atomic force microscopy and micromanipulation. Food and Bioproducts Processing, 88(4) pp. 341–348.

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Many researchers have studied the effects of changing the surface on fouling and cleaning. In biofouling the 'Baier curve' is a well-known result which relates adhesion to surface energy, and papers on the effect of changing surface energy to food fouling can be found more than 40 years ago. Recently the use of modified surfaces, at least at a research level, has been widespread. Here two different ways of studying surface-deposit interactions have been compared. Atomic force microscopy (AFM) is a method for probing interactions at a molecular level, and can measure (for example) the interaction between substrate and surfaces at a nm-scale. At a μm-mm level, we have developed a micromanipulation tool that can measure the force required to remove the deposit; the measure incorporates both surface and bulk deformation effects. The two methods have been compared by studying a range of model soils: toothpaste, as an example of a soil that can be removed by fluid flow alone, and confectionery soils. Removal has been studied from glass, stainless steel and fluorinated surfaces as examples of the sort of surfaces that can be found in practice. AFM measurements were made by using functionalized tips in force mode. The two types of probe give similar results, although the rheology of the soil affects the measurement from the micromanipulation probe under some circumstances. The data suggests that either method could be used to test candidate surfaces.

Item Type: Journal Item
Copyright Holders: 2010 The Institution of Chemical Engineers
ISSN: 0960-3085
Extra Information: Special Issue on Fouling and cleaning in food processing 2010
Keywords: fouling; cleaning; food processing; toothpaste; confectionary products; surfaces; AFM; micromanipulation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 43190
Depositing User: James Bowen
Date Deposited: 15 Jun 2015 10:16
Last Modified: 08 Dec 2018 06:31
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