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Hendrikse RL, Bayly AE, Jimack PK, Lai X. Using Raman Spectroscopy and Molecular Dynamics to Study Conformation Changes of Sodium Lauryl Ether Sulfate Molecules. J Phys Chem B 2023; 127:4676-4686. [PMID: 37192532 DOI: 10.1021/acs.jpcb.3c02022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A study using both Raman spectroscopy and molecular dynamics (MD) simulations was carried out for alkyl ethoxysulfate (AES) surfactants at various concentrations in solution. Direct comparison between experiment and simulation shows that the conformational changes observed in MD are in good agreement with those obtained via Raman spectroscopy. We show that there is an increase in the relative number of trans conformations with increasing concentration and illustrate the relationship between phase structure and molecular conformation, which is often speculated but difficult to confirm. Our results open up the possibility of applying MD to other surfactants, with the aim of analyzing conformational behavior, which can typically be difficult to study experimentally using spectroscopy methods, due to large numbers of vibrational modes present in large complex molecules.
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Affiliation(s)
- Rachel L Hendrikse
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
- EPSRC Centre for Doctoral Training in Fluid Dynamics at Leeds, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Andrew E Bayly
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Peter K Jimack
- EPSRC Centre for Doctoral Training in Fluid Dynamics at Leeds, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Xiaojun Lai
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
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Cosby J, Starck P, Littlewood D, Mykhaylyk OO, Ryan AJ. Co-assembly and Structure of Sodium Dodecylsulfate and other n-Alkyl Sulfates in Glycerol: n-Alkyl Sulfate-Glycerol Crystal Phase. J Colloid Interface Sci 2021; 596:442-454. [PMID: 33852984 DOI: 10.1016/j.jcis.2021.03.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS Following the observation of a microfibrillar phase in sodium dodecylsulfate (SDS)-glycerol mixtures, it is hypothesized that this phase is a crystalline structure containing SDS and glycerol, where the interaction between sulfate and glycerol layers mediates the co-assembly, which also could be universal for similar systems formed by n-alkyl sulfate homologues. Experiment. n-alkyl sulfate glycerol solutions were studied using a combination of optical microscopy, small- and wide-angle X-ray scattering (SAXS/WAXS). Time-resolved SAXS was employed to determine the phase formation in SDS-glycerol-water mixtures. FINDINGS The microfibrillar crystalline phase was reproduced in even-chained n-alkyl sulfates with a chain length between 12 and 18 carbon atoms, where the phase lamellar period increased uniformly with the alkyl chain length. Reconstruction of electron density profiles from the diffraction patterns allowed the lamellar structural motif of the phase, the glycerol location and stoichiometry to be determined. When SDS-glycerol-water mixtures with water concentration below 6 wt% are isothermally solidified at 20 °C, SDS-glycerol crystals and/or anhydrous SDS form, where the former is inhibited by the latter at higher water concentrations. The learnings from the SDS-glycerol phase formation allows new gels to be created, utilising the glycerol-sulfate motif generating microfibrils. This expands the knowledge of the applicable formulation space for SDS-water containing mixtures.
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Affiliation(s)
- James Cosby
- Department of Chemistry, The University of Sheffield, Sheffield S3 7HF, UK
| | - Pierre Starck
- Unilever Research Port Sunlight, Quarry Road East, Bebington, Wirral CH63 3JW, UK
| | - Dave Littlewood
- Unilever Research Port Sunlight, Quarry Road East, Bebington, Wirral CH63 3JW, UK
| | | | - Anthony J Ryan
- Department of Chemistry, The University of Sheffield, Sheffield S3 7HF, UK
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Tyagi G, Seddon D, Khodaparast S, Sharratt WN, Robles ES, Cabral JT. Tensiometry and FTIR study of the synergy in mixed SDS:DDAO surfactant solutions at varying pH. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126414] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Smith AJ, Alcock SG, Davidson LS, Emmins JH, Hiller Bardsley JC, Holloway P, Malfois M, Marshall AR, Pizzey CL, Rogers SE, Shebanova O, Snow T, Sutter JP, Williams EP, Terrill NJ. I22: SAXS/WAXS beamline at Diamond Light Source - an overview of 10 years operation. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:939-947. [PMID: 33950002 PMCID: PMC8127364 DOI: 10.1107/s1600577521002113] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 02/23/2021] [Indexed: 05/04/2023]
Abstract
Beamline I22 at Diamond Light Source is dedicated to the study of soft-matter systems from both biological and materials science. The beamline can operate in the range 3.7 keV to 22 keV for transmission SAXS and 14 keV to 20 keV for microfocus SAXS with beam sizes of 240 µm × 60 µm [full width half-maximum (FWHM) horizontal (H) × vertical (V)] at the sample for the main beamline, and approximately 10 µm × 10 µm for the dedicated microfocusing platform. There is a versatile sample platform for accommodating a range of facilities and user-developed sample environments. The high brilliance of the insertion device source on I22 allows structural investigation of materials under extreme environments (for example, fluid flow at high pressures and temperatures). I22 provides reliable access to millisecond data acquisition timescales, essential to understanding kinetic processes such as protein folding or structural evolution in polymers and colloids.
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Affiliation(s)
- A. J. Smith
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - S. G. Alcock
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - L. S. Davidson
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - J. H. Emmins
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - J. C. Hiller Bardsley
- King’s College London, Guy’s Campus, Great Maze Pond, London SE1 1UL, United Kingdom
| | - P. Holloway
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - M. Malfois
- ALBA Synchrotron, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Barcelona, Spain
| | - A. R. Marshall
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - C. L. Pizzey
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - S. E. Rogers
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - O. Shebanova
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - T. Snow
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - J. P. Sutter
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - E. P. Williams
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - N. J. Terrill
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
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Khodaparast S, Sharratt WN, Tyagi G, Dalgliesh RM, Robles ESJ, Cabral JT. Pure and mixed aqueous micellar solutions of Sodium Dodecyl sulfate (SDS) and Dimethyldodecyl Amine Oxide (DDAO): Role of temperature and composition. J Colloid Interface Sci 2021; 582:1116-1127. [PMID: 32942067 DOI: 10.1016/j.jcis.2020.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 05/22/2020] [Accepted: 08/02/2020] [Indexed: 11/26/2022]
Abstract
Aqueous mixtures of anionic and nonionic/cationic surfactants can form non-trivial self-assemblies in solution and exhibit macroscopic responses. Here, we investigate the micellar phase of pure and mixed aqueous solutions of Sodium Dodecyl Sulfate (SDS) and Dimethyldodecyl Amine Oxide (DDAO) using a combination of Small Angle Neutron Scattering (SANS), Fourier-Transform Infrared Spectroscopy (FTIR) and rheological measurements. We examine the effect of temperature (0-60 °C), on the 20 wt% SDS micellar solutions with varying DDAO (⩽5 wt%), and seek to correlate micellar structure with zero-shear solution viscosity. SANS establishes the formation of prolate ellipsoidal micelles in aqueous solutions of pure SDS, DDAO and SDS/DDAO mixtures, whose axial ratio is found to increase upon cooling. Elongation of the ellipsoidal micelles of pure SDS is also induced by the introduction of the non-anionic DDAO, which effectively reduces the repulsive interactions between the anionic SDS head-groups. In FTIR measurements, the formation of elongated mixed ellipsoidal micelles is confirmed by the increase of ordering in the hydrocarbon chain tails and interaction between surfactant head-groups. We find that the zero-shear viscosity of the mixed surfactant solutions increases exponentially with decreasing temperature and increasing DDAO content. Significantly, a master curve for solution viscosity can be obtained in terms of micellar aspect ratio, subsuming the effects of both temperature and DDAO composition in the experimental range investigated. The intrinsic viscosity of mixed micellar solutions is significantly larger than the analytical and numerical predictions for Brownian suspensions of ellipsoidal colloids, highlighting the need to consider interactions of soft micelles under shear, especially at high concentrations.
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Affiliation(s)
- Sepideh Khodaparast
- Chemical Engineering Department, Imperial College London, SW7 2AZ London, United Kingdom; School of Mechanical Engineering, University of Leeds, LS2 9JT Leeds, United Kingdom.
| | - William N Sharratt
- Chemical Engineering Department, Imperial College London, SW7 2AZ London, United Kingdom
| | - Gunjan Tyagi
- Chemical Engineering Department, Imperial College London, SW7 2AZ London, United Kingdom
| | - Robert M Dalgliesh
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, OX11 0QX Didcot, United Kingdom
| | - Eric S J Robles
- The Procter & Gamble Company, Newcastle Innovation Centre, NE12 9TS Newcastle-Upon-Tyne, United Kingdom
| | - João T Cabral
- Chemical Engineering Department, Imperial College London, SW7 2AZ London, United Kingdom.
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Synthesis and characterization of choline–fatty-acid-based ionic liquids: A new biocompatible surfactant. J Colloid Interface Sci 2019; 551:72-80. [DOI: 10.1016/j.jcis.2019.04.095] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/26/2019] [Accepted: 04/30/2019] [Indexed: 11/23/2022]
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Fan Y, Wang Y. Applications of small-angle X-ray scattering/small-angle neutron scattering and cryogenic transmission electron microscopy to understand self-assembly of surfactants. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.02.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Summerton E, Bettiol J, Jones C, Britton MM, Bakalis S. Understanding the Crystallization Process in Detergent Formulations in the Absence and Presence of Agitation. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b02975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Emily Summerton
- School of Chemical Engineering, University of Birmingham, Edgbaston, B15 2TT, United Kingdom
| | - Jeanluc Bettiol
- Procter and Gamble Brussels Innovation Center, Temselaan 100, 1853, Strombeek Bever, Brussels, Belgium
| | - Christopher Jones
- Procter and Gamble Brussels Innovation Center, Temselaan 100, 1853, Strombeek Bever, Brussels, Belgium
| | - Melanie M. Britton
- School of Chemistry, University of Birmingham, Edgbaston, B15 2TT, United Kingdom
| | - Serafim Bakalis
- School of Chemical Engineering, University of Birmingham, Edgbaston, B15 2TT, United Kingdom
- Department of Chemical and Environmental Engineering, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
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