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- W2077302267 endingPage "129" @default.
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- W2077302267 abstract "The apparent molal volumes, VΦ, of poly(oxyethylene) dodecyl ethers, C12En (n = 6, 9.0, 14.8, 19.2, and 23.9), and poly(ethylene glycol) (PEG) oligomers with various degrees of polymerization were determined at 298.15 K as a function of pressure up to 160 MPa. The isothermal apparent molal compressibility, κΦ = −(ϱVΦϱP)T′→T, decreases with an increase in oxyethylene (OE) chain length of nonionic surfactant and PEG. The decreasing values of κΦ, therefore, correspond to a reduction in the hydrophobicity of the solute. The apparent molal volume assigned for one OE group, VΦ(OE), was taken as the slope in a linear plot of VΦ vs OE chain length at various pressures. The value of VΦ(OE) for both surfactant and PEG are almost constant or increase slightly with increasing pressure. The decreasing VΦ of micellar surfactant with pressure is attributable to the contraction of the hydrophobic core of a micelle. The hydrophilic region of a micelle is resistant to compression." @default.
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- W2077302267 date "1980-01-01" @default.
- W2077302267 modified "2023-09-24" @default.
- W2077302267 title "Effect of pressure on apparent molal volumes of nonionic surfactants in aqueous solutions" @default.
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- W2077302267 doi "https://doi.org/10.1016/0021-9797(80)90129-0" @default.
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