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

Paper ID Volume ID Publish Year Pages File Format Full-Text
19146 43046 2010 8 PDF Available
Title
Matching the nano- to the meso-scale: Measuring deposit–surface interactions with atomic force microscopy and micromanipulation
Abstract

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.

Research highlights▶ Micromanipulation and atomic force microscopy have been compared as ways of studying how deposits adhere to surfaces. ▶ For a range of deposits and surfaces, the two methods show similar results. ▶ For most systems, fluorinated surfaces show the least adhesion. ▶ However, ‘turkish delight’, an agar-based deposit, is most adhesive to a fluorinated surface.

Keywords
Fouling; Cleaning; Food processing; Toothpaste; Confectionary products; Surfaces; AFM; Micromanipulation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 88, Issue 4, December 2010, Pages 341–348
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us