Aggregation of tetrameric acids in aqueous media studied by small-angle neutron scattering

被引:12
|
作者
Simon, Sebastien [1 ]
Knudsen, Kenneth D. [2 ]
Nordgard, Erland [1 ]
Reisen, Christian [1 ]
Sjoblom, Johan [1 ]
机构
[1] Norwegian Univ Sci & Technol, NTNU, Dept Chem Engn, Ugelstad Lab, N-7491 Trondheim, Norway
[2] Inst Energy Technol, IFE, N-2007 Kjeller, Norway
关键词
Tetrameric acids; ARN; Naphthenic acids; Calcium naphthenate deposits; Micelles; SANS; C-80 ISOPRENOID TETRAACIDS; SODIUM DODECYL-SULFATE; NAPHTHENIC ACIDS; LIGHT-SCATTERING; PHYSICAL-PROPERTIES; MODEL COMPOUNDS; DEPOSITION; CALCIUM; SYSTEMS;
D O I
10.1016/j.jcis.2012.12.012
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This article presents the characterization of two self-associated structures, a C-80-tetraacid (also known as ARN), which is an aliphatic molecule present in crude oil and responsible for the formation of deposits, and BP-10, a molecule designed to model the properties of the C-80-tetraacid. These molecules have four carboxylic functions at the end of four interconnected hydrocarbon chains and can be dissolved in aqueous solution and in basic media. In this paper we have used small-angle neutron scattering (SANS) as the main method to study the tetrameric acids in solution. SANS measurements show that the two molecules (in sodium form) exhibit very different types of aggregation properties in aqueous solution. More specifically, Na4BP-10 forms nanometer-sized micelles with an aggregation-number close to 5 (at concentrations above the critical micellar concentration) in both 20 mM NaCL and 0.9 wt.% 1-butanol media. On the contrary fully ionised C-80-TA forms very large structures in pure D2O and NaCl 20 mM, so large that their exact dimensions could not be determined by SANS. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码:277 / 283
页数:7
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