Crystallisation of sodium dodecyl sulfate–water micellar solutions with structurally similar additives: counterion variation

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Title: Crystallisation of sodium dodecyl sulfate–water micellar solutions with structurally similar additives: counterion variation
Authors: Miller, RM
Cabral, J
Robles, E
Brooks, N
Ces, O
Item Type: Journal Article
Abstract: The effects of a series of structurally similar sodium dodecyl sulfate (SDS) additives on the crystallisation of SDS–water micellar solutions were investigated using a combination of differential scanning calorimetry, dynamic light scattering, optical microscopy and inductively coupled plasma optical emission spectroscopy. Seven different counterions were chosen from groups 1 and 2 of the periodic table to replace the sodium on SDS: LDS, (SDS), KDS, RbDS, CsDS, Mg(DS)2, Ca(DS)2 and Sr(DS)2. Two representative temperature profiles were employed – linear cooling ramps at rate of 0.5 °C min−1 to determine near-equilibrium kinetics and transitions and isothermal holds at 6 °C to elucidate morphological changes. Crystallisation of the reference solution 20% SDS–H2O with 0.25, 1.0 and 2.5% additive was generally promoted or inhibited even at the lowest concentrations. Melting points however remained largely unchanged, suggesting that the additives predominantly had a kinetic rather than thermodynamic effect. ICP-OES measurements for the solutions containing 1% additive indicated that most of the additives were integrated into the SDS crystals which was reflected by morphological changes, including the formation of hexagonal and oval shaped crystals. Our results both quantify and provide a morphological insight into the effect of a series of additives on the crystallisation of micellar SDS solutions, which can readily form due to preferential Na exchange.
Issue Date: 14-Nov-2018
Date of Acceptance: 1-Aug-2018
URI: http://hdl.handle.net/10044/1/62974
DOI: https://dx.doi.org/10.1039/c8ce00452h
ISSN: 1466-8033
Publisher: Royal Society of Chemistry
Start Page: 6834
End Page: 6843
Journal / Book Title: CrystEngComm
Volume: 20
Issue: 42
Copyright Statement: © The Royal Society of Chemistry 2018. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/)
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Crystallography
Chemistry
AQUEOUS-SOLUTIONS
CRYSTAL PHASES
SURFACE-TENSION
ALKYL SULFATES
NUCLEATION
DIHYDRATE
SYSTEM
STABILIZATION
DISSOLUTION
HYDROLYSIS
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
0302 Inorganic Chemistry
Inorganic & Nuclear Chemistry
Publication Status: Accepted
Online Publication Date: 2018-10-15
Appears in Collections:Faculty of Engineering
Chemistry
Biological and Biophysical Chemistry
Chemical Engineering
Faculty of Natural Sciences



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