Surfactant with polyoxyethylene group

For nonionic surfactants with polyoxyethylene solubilizing groups, the HLB may be calculated from the formula... 

Nonionic the surfactant has no groups with charge such as, for example, monoglycerides of long-chain fatty acids or polyoxyethylenated alkylphenols. 

CnSOC-CyFNa (nonionic-anionic) system. In order to avoid the complex structure and function of polyoxyethylene group.in a common nonionic surfactant (e.g. TX100), we use octylmethyl sulfoxide as a partner in the pair system to study the molecular interactions. The surface tension of the surfactants solutions (with and without adding salt) are shown in fig.6 and 7. The surface properties of 1 1 CgSOC-CyFNa system with adding salt (from Fig.6) are shown in Table 7. 

The HLB system used above does not take into consideration the temperature effects. Upon heating, an O/W emulsion prepared with nonionic surfactants inverts to a W/O emulsion because the hydrogen bondings in the polyoxyethylene groups are broken, and the HLB value of the surfactant becomes smaller. The higher the... 

A combination of SLS and DLS methods was used to investigate the behavior of nonionic micellar solutions in the vicinity of their cloud point. It had been known for many years that at a high temperature the micellar solutions of polyoxyethylene-alkyl ether surfactants (QEOm) separate into two isotropic phases. The solutions become opalescent with the approach of the cloud point, and several different explanations of this phenomenon were proposed. Corti and Degiorgio measured the temperature dependence of D pp and (Ig), and found that they can be described as a result of critical phase separation, connected with intermicellar attraction and long-range fluctuations in the local micellar concentration. Far from the cloud point, the micelles of nonionic surfactants with a large number of ethoxy-groups (m 30) may behave as hard spheres. ... 

Triton X-100 and X-114 are industrial p-rcrr-octylphenol polyoxyethylene surfactants with about 9.2 and 7.5 ethylene oxide groups per molecule respectively. They are used in biochemical studies because of their ability to disrupt biological membranes without denaturing integral membrane proteins [ 119]. TX-100 [ 120] forms an H1 phase between 37 and 63% surfactant from 0 to... 

Polyoxyethylene (POE) nonionic surfactants with the same hydrophobic group and an average of 7-30 OE units, exhibit adsorption efficiencies that follow an approximately linear relationship of the form... 

Surfactants are usually determined as a group of compovmds, so that sophisticated chromatographic procedures are not needed. Ion-pair formation between both anionic and cationic surfactants with polar dyes, such as methylene blue and brom-ocresol purple, respectively, with or without subsequent inline solvent extraction has been assessed using spectrophotometric or spectrofluorimetric detection as shown in Table 1. Polyoxyethylene and amine ethoxylate-based nonionic surfactants in environmental waters have been determined by spectrophotometry following polar interactions with chromogenic agents, and by CL detection in the presence of sensitizers, respectively. 

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