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Organization of amphiphiles: V. In situ fluorescence probing of the adsorbed layers of polyoxyethylated alkyl phenols at silica–water interfaces by Pramila K Misra; Bijay Kumar Mishra; P Somasundaran is a Chemistry article available to read on EtoBox.

What is Organization of amphiphiles: V. In situ fluorescence probing of the adsorbed layers of polyoxyethylated alkyl phenols at silica–water interfaces about?

The sensitivity of the pyrene monomer emission spectrum to the polarity of a medium has been exploited to probe the adsorbed layer of a series of polyoxyethylated alkyl phenols on silica surface. Both the hydrophobicity and hydrophilicity of the surfactants are found to control the adsorption of the surfactants at the silica-water interface. In a series of surfactants having the same hydrophobic chain length but with different hydrophilic chain lengths, the presence of a smaller number of hydrophilic oxyethylene units leads to a conspicuous increase in adsorption density in the premicellar region compared to surfactants having a larger number of oxyethylene units. This has been attributed to the formation of small aggregates (hemimicelles) on the silica surface in the former. The formation of the aggregates gets support from the emission characteristics of pyrene. The number of surfactants constituting different aggregates has been determined.

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Author

Pramila K Misra; Bijay Kumar Mishra; P Somasundaran

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2003

Language

EN

Field

Chemistry (Physical Sciences)