Imperial College London
Alternate

Professor Oscar Ces

Faculty of Natural Sciences, Department of Chemistry

Head of Department, August von Hofmann Chair of Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 3754o.ces Website

 
 
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Location

 

G04AMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Miller:2018:10.1039/c8ce00452h,
author = {Miller, RM and Cabral, J and Robles, E and Brooks, N and Ces, O},
doi = {10.1039/c8ce00452h},
journal = {CrystEngComm},
pages = {6834--6843},
title = {Crystallisation of sodium dodecyl sulfate–water micellar solutions with structurally similar additives: counterion variation},
url = {http://dx.doi.org/10.1039/c8ce00452h},
volume = {20},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 profileswere 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.
AU  - Miller,RM
AU  - Cabral,J
AU  - Robles,E
AU  - Brooks,N
AU  - Ces,O
DO  - 10.1039/c8ce00452h
EP  - 6843
PY  - 2018///
SN  - 1466-8033
SP  - 6834
TI  - Crystallisation of sodium dodecyl sulfate–water micellar solutions with structurally similar additives: counterion variation
T2  - CrystEngComm
UR  - http://dx.doi.org/10.1039/c8ce00452h
UR  - http://hdl.handle.net/10044/1/62974
VL  - 20
ER  -
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