By Richard Pashley, Marilyn Karaman
Utilized Colloid and floor Chemistry is a large creation to this interdisciplinary box. Taking a really utilized procedure, with functions drawn from a variety of industries, this e-book will meet the calls for of the scholar at present operating within the field.The textual content contains keynote sections written through working towards business study scientists, bringing to the reader a wealth of genuine commercial examples. those examples variety from water remedy via to soil administration in addition to examples taken from the coatings and photographic industries. to assist accessibility, the various extra challenging mathematical derivations are separated from the most textual content, allowing them to be refrained from as required.With conscientiously dependent chapters, beginning with studying targets, and containing educational questions with solutions and explanatory notes, this article is important for undergraduates taking a primary direction on colloid and floor chemistry. This ebook may also be appropriate to postgraduates and execs, who want an up to date account of the topic.
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Additional info for Applied Colloid and Surface Chemistry
THE KELVIN EQUATION 25 where re is the equilibrium radius of the (spherical) meniscus. Thus, it follows that the change in chemical potential of the liquid must be given by Dm l = Vm DP = 2gVm re which, combining with the earlier equation for the change in chemical potential of the vapour gives the result P 2gVm Dm v = m v - m 0 = RT lnÊ ˆ = Dm l = Ë P0 ¯ re which on re-arrangement gives the Kelvin equation for spherical menisci: P 2gVm RT lnÊ ˆ = Ë P0 ¯ re P 1 1 or, in general: RT lnÊ ˆ = gVm Ê + ˆ Ë P0 ¯ Ë R1 R2 ¯ This relationship gives some interesting and useful predictions for the behaviour of curved interfaces.
The degree of hysteresis observed is a measure of both surface roughness and surface chemical heterogeneity. Industrial Report Photographic-quality printing Modern photographic-quality inkjet papers have a surface coating comprising either a thin polymer film or a fine porous layer. In either case the material is formed using a high-speed coating process. This process requires careful control to obtain the necessary uniformity together with Continued 34 SURFACE TENSION AND WETTING low manufacturing costs.
Both advancing (qA) and receding (qR) angles will be measured in order to estimate the degree of hysteresis in each case. Use the values of both qA and qR, as well as the average, to produce several Zisman plots. Experimental details Contact angle measurement The contact angles can be measured by observing the TPL through a microscope that has a rotating eyepiece and cross-hairs. The eyepiece is used to measure the angle of the cross-hairs on a protractor scale. By tilting the microscope slightly the reflected image of the liquid droplet can also be observed and the double-angle (2q) can be measured, which increases the accuracy.
Applied Colloid and Surface Chemistry by Richard Pashley, Marilyn Karaman