Solvation of nonionic poly(ethylene oxide) surfactant Brij 35 in organic and aqueous-organic solvents

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:594

Article

Cerar, Jure¹  Jamnik, Andrej¹  Szilagyi, Istvan²  Tomsic, Matija¹ 

[1] Univ Ljubljana, Fac Chem & Chem Technol, Vecna Pot 113, SI-1000 Ljubljana, Slovenia

[2] Univ Szeged, Interdisciplinary Excellence Ctr, Dept Phys Chem & Mat Sci, MTA SZTE Lendulet Biocolloids Res Grp, H-6720 Szeged, Hungary

关键词: SWAXS;    Complemented-system approach;    Molecular dynamics;    Organic solvents;    Alcohol;    PEO surfactant;    Self-diffusion coefficients;    Ethanol;    Butanol;    Hexanol;   

DOI  :  10.1016/j.jcis.2021.02.113

来源: Elsevier

【 摘 要 】

Hypothesis: By combining the experimental small- and wide-angle x-ray scattering (SWAXS) method with molecular dynamics simulations and the theoretical 'complemented-system approach' it is possible to obtain detailed information about the intra- and inter-molecular structure and dynamics of the solvation and hydration of the surfactant in organic and mixed solvents, e.g., of the nonionic surfactant Brij 35 (C12E23) in alcohols and aqueous alcohol-rich ternary systems. This first application of the complemented-system approach to the surfactant system will promote the use of this powerful methodology that is based on experimental and calculated SWAXS data in studies of colloidal systems. By applying high-performance computing systems, such an approach is readily available for studies in the colloidal domain. Experiments: SWAXS experiments and MD simulations were performed for binary Brij 35/alcohol and ternary Brij 35/water/alcohol systems with ethanol, n-butanol and n-hexanol as the organic solvent component at 25 degrees C. Findings: We confirmed the presence of solvated Brij 35 monomers in the studied organic media, revealed their preferential hydration and discussed their structural and dynamic features at the intraand inter-molecular levels. Anisotropic effective surfactant molecular conformations were found. The influence of the hydrophobicity of the organic solvent on the hydration phenomena of surfactant molecules was explained. (C) 2021 Elsevier Inc. All rights reserved.

【 授权许可】

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