Read e-book online Colloids and Interfaces with Surfactants and Polymers PDF

By James Goodwin

ISBN-10: 0470518812

ISBN-13: 9780470518816

From blood to exploit, pumice to gelatine, such a lot scientists have interaction with colloids each day with none genuine wisdom in their nature. construction at the luck of the 1st version, Colloids and Interfaces with Surfactants and Polymers moment variation is a uncomplicated, non-technical advent to colloids and interfaces.Includes:Many useful examples of colloid and interface scienceAn greater part on fluorescence microscopy, a usual procedure in organic platforms for the optical imaging of mobile structuresA new part on phenomenology (the precept of time/temperature superposition), which allows the experimentalist to increase the frequency variety in their rheological instrumentsNew details on sedimentation and methods for the keep an eye on of sedimentation, that's severe in lots of dispersions of industrial importanceFresh remedies of conventional theoretical themes just like the electric double-layer, colloidal interactions, wetting habit and light-weight scattering, in addition to more moderen advances in polymer technology, statistical mechanics and using neutronsIn-depth discussions of time-honored concepts with arithmetic utilized in a straight-forward manner so quantitative descriptions of colloid and interface homes might be derivedColloids and Interfaces with Surfactants and Polymers moment variation explains the entire basic ideas of colloids and interfaces in addition to detailing a few of the extra complicated elements that can be precious in particular purposes. meant for undergraduate and graduate classes in colloids and tender fabrics, the booklet can also be suitable to these within the chemical, coatings, cosmetics, ceramics, nutrition, pharmaceutical and oil industries.For Powerpoint slides of the entire figures within the e-book, please see the trainer better half web site at http://bcs.wiley.com/he-bcs/Books?action=index&bcsId=5121&itemId=0470518804

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The first thing to note is that the trimethylammonium head group is larger than a carboxylic acid group, but is it twice as big? – well, perhaps not. Hence the second feature that we should consider is that the group is positively charged. Like charges repel, and this acts to reduce the packing density. Let us consider the charge in more detail. e. 36 nm2 of surface. This gives a measure of the surface charge density, σ s , of ∼45 µC cm−2 . Experiments with solids, such as silver iodide, or oxides, such as titanium dioxide, yield surface charge densities in the range 1–15 µC cm−2 , so this clearly would be a very highly charged surface.

The slope of the surface tension–log(concentration) curve increases steadily as the surfactant concentration is increased. This tells us that the relative adsorption of the C16 TAB is increasing as more is added to SURFACTANTS 25 the water. However, at the cmc there is an abrupt change in slope and what then occurs is that the surface tension changes very little with more concentrated solutions. What we find here is that above the cmc, where the surface is closely packed, there are small aggregates of surfactant molecules in solution.

The robustness of the stability against aggregation of many colloids of biological origin is due to the presence of proteinaceous macromolecules on their surfaces. As an example, we have to look no further than the stabilization of the fatty acid droplets in milk which are stabilized by casein. We often add polymers which will adsorb on particles for this purpose. However, Nature has provided a very effective mechanism for keeping particles apart by three components. Only part of the macromolecule adsorbs, that is, is attached.

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Colloids and Interfaces with Surfactants and Polymers by James Goodwin


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