Applied Surfactants: Principles and Applications - download pdf or read online

By Tharwat F. Tadros

ISBN-10: 3527306293

ISBN-13: 9783527306299

Whereas at present to be had titles both concentrate on the fundamentals or on very particular subtopics, this article meets the necessity for a finished survey of surfactants and their homes, with a powerful emphasis on purposes and their correlation to the basics.

the writer covers their category, actual homes, section habit, adsorption, results - akin to wetting, spreading and adhesion - in addition to commercial functions in own care and cosmetics, prescribed drugs, agrochemicals and nutrients items.

Professor Tadros is a widely known professional concerning surfactants, with a lot adventure in colloid technological know-how. the following, he makes use of his business adventure to shut the distance among basics of surfactants and their relevance and functions in perform.

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Additional resources for Applied Surfactants: Principles and Applications

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The basic raw materials are glucose and fatty alcohols (which may be derived from vegetable oils) and hence these surfactants are sometimes referred to as ‘‘environmentally friendly’’. e. a total of 8 OH groups). 1–3. The properties of APG surfactants depend upon the alkyl chain length and the average degree of polymerisation. APG surfactants have good solubility in water and high cloud points (> 100  C). They are stable in neutral and alkaline solutions but are unstable in strong acid solutions.

Micelles and surfactant ions (molecules) are thought to co-exist, the concentration of the latter changing very slightly as more surfactant is dissolved. However, the self-association of an amphiphile occurs in a stepwise manner with one monomer added to the aggregate at a time. For a long-chain amphiphile, the association is strongly cooperative up to a certain micelle size where counteracting factors became increasingly important. c. Indeed, Adam [7] and Hartley [8] first suggested that micelles are spherical and have the following properties: (1) the association unit is spherical with a radius approximately equal to the length of the hydrocarbon chain; (2) the micelle contains about 50–100 monomeric units – the aggregation number generally increases with increasing alkyl chain length; (3) with ionic surfactants, most counter ions are bound to the micelle surface, thus significantly reducing the mobility from the value expected from a micelle with non-counterion bonding; (4) micellization occurs over a narrow concentration range due to the high association number of surfactant micelles; (5) the interior of the surfactant micelle has essentially the properties as a liquid hydrocarbon.

The kinetic aspects) as well as the equilibrium aspects whereby the laws of thermodynamics may be applied to obtain the free energy, enthalpy and entropy of micellization. Below a brief description of both aspects will be given and this will be followed by a picture of the driving force for micelle formation. , nS Ð Sn ð2:6Þ Hartley [8] envisaged a dynamic equilibrium whereby surface active agent molecules are constantly leaving and entering, from solution, the micelles. The same applies to the counter ions with ionic surfactants, which can exchange between the micelle surface and bulk solution.

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Applied Surfactants: Principles and Applications by Tharwat F. Tadros

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