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Penfold J, Thomas RK. Neutron reflection and the thermodynamics of the air-water interface. Phys Chem Chem Phys 2022; 24:8553-8577. [PMID: 35352746 DOI: 10.1039/d2cp00053a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By means of isotopic substitution, measurements of the neutron reflectivity (NR) from a flat water surface generally give model independent measurements of the amount of a chosen solute at the surface irrespective of whether the layer is a mixture or whether there is any aggregation in the bulk solution. Previously, adsorption at air-water interfaces has been determined by applying the Gibbs equation to surface tension (ST) measurements, which requires assumptions about the composition of the surface and about the activity of the solute in the bulk, which, in turn, means that in practice the surface is assumed to consist of the pure solute or of a mixture of pure solutes, and that the activity of the solute in the bulk solution is known. The use of NR in combination with ST-Gibbs measurements makes it possible to (i) avoid these assumptions and hence understand several patterns of ST behaviour previously considered to be anomalous and (ii) to start to analyse quantitatively the behaviour of mixed surfactants both below and above the critical micelle concentration. These two developments in our understanding of the thermodynamics of the air-water interface are described with recent examples.
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Affiliation(s)
- Jeffrey Penfold
- ISIS Facility, Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxon, UK. .,Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK
| | - Robert K Thomas
- Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK
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2
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Wang X, Zhang J, Xu Z, Rao C, Pi L, Fu Y, Dong Y, Shen C, Yao L, Xiong C. Synthesis and application of recyclable
core‐shell
structure microspheres
MCTS‐g‐AT
in detection of Hg(
II
) in aquatic products. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaoqing Wang
- School of Biological and Chemical Engineering Zhejiang University of Science and Technology Hangzhou PR China
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
| | - Jing Zhang
- School of Biological and Chemical Engineering Zhejiang University of Science and Technology Hangzhou PR China
| | - Zimeng Xu
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
| | - Chen Rao
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
| | - Leilei Pi
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
| | - Yaqin Fu
- Key laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education Zhejiang Sci‐Tech University Hangzhou PR China
| | - Yubing Dong
- Key laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education Zhejiang Sci‐Tech University Hangzhou PR China
| | - Chen Shen
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
| | - Lanying Yao
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
| | - Chunhua Xiong
- Department of Applied Chemistry Zhejiang Gongshang University Hangzhou PR China
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3
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Soboleva OA, Tsarkova LA. Surface Properties of Aqueous Solutions of Mixtures of Sodium Dodecyl Sulphate and Linalool under Equilibrium and Dynamic Conditions. COLLOID JOURNAL 2020. [DOI: 10.1134/s1061933x20040146] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Saaka Y, Allen DT, Luangwitchajaroen Y, Shao Y, Campbell RA, Lorenz CD, Lawrence MJ. Towards optimised drug delivery: structure and composition of testosterone enanthate in sodium dodecyl sulfate monolayers. SOFT MATTER 2018; 14:3135-3150. [PMID: 29629469 DOI: 10.1039/c7sm01893b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Surface tension and specular neutron reflectivity measurements have been used, for the first time to systematically study both the interfacial structure and composition of monolayers of the soluble surfactant, sodium dodecyl sulfate containing a low-dose, poorly water soluble drug, testosterone enanthate. Modelling of the specular neutron reflectivity data suggests that the hydrophobic testosterone enanthate was adsorbed in the C12 hydrophobic tail region of the surfactant monolayer, regardless of the concentration of surfactant at the interface and whether or not additional drug was added to the interface. The location of the hydrophobic drug in the tail region of the surfactant monolayer is supported by the results of classical, large-scale molecular dynamics simulations. The thickness of the surfactant monolayer obtained, in the presence and absence of drug, using molecular dynamics simulations was in good agreement with the corresponding values obtained from the specular neutron reflectivity measurements. The stoichiometry of surfactant:drug at the air-water interface at sodium dodecyl sulfate concentrations above the critical micelle concentration was determined from specular neutron reflectivity measurements to be approximately 3 : 1, and remained constant after the spreading of further testosterone enanthate at the interface. Significantly, this stoichiometry was the same as that obtained in the micelles from bulk solubilisation studies. Important insights into the preferred location of drug in surfactant monolayers at the air-water interface as well as its effect on the structure of the monolayer have been obtained from our combined use of experimental and simulation techniques.
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Affiliation(s)
- Yussif Saaka
- Institute of Pharmaceutical Sciences, Faculty of Life Sciences and Medicine, King's College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, UK
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5
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Chat OA, Nazir N, Bhat PA, Hassan PA, Aswal VK, Dar AA. Aggregation and Rheological Behavior of the Lavender Oil-Pluronic P123 Microemulsions in Water-Ethanol Mixed Solvents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1010-1019. [PMID: 29155597 DOI: 10.1021/acs.langmuir.7b02845] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The effect of lavender oil on aggregation characteristics of P123 in aqueous-ethanolic solutions is investigated systematically by DLS, SANS, and rheology. The solubilization capacity of the P123 based formulations toward Lavender oil increased by increasing P123 concentration. The study unveiled the importance of the short chain alcohol-ethanol, as solubilization enhancer. The apparent hydrodynamic radius (Rh) increased significantly with an increase in lavender oil concentration up to maximum oil solubilization capacity of the copolymer at a particular ethanol concentration. DLS measurements on 5, 10, and 15 wt% P123 in the presence of 25% ethanol revealed the presence of large-sized micellar clusters in addition to the oil swollen micelles. The core size (RC), radius of hard sphere (RHS), and aggregation number (N) obtained from SANS profiles showed considerable enhancement with the addition of lavender oil confirming penetration of oil inside the copolymer. Rheological studies showed that viscosity also increased significantly with the addition of lavender oil near the maximum loading limit of the P123 concentration. Quite interestingly, the sol-gel transition temperature displayed a strong dependence on both P123 as well as oil concentration and decreased almost linearly by increasing oil concentration. This study demonstrates the use of a biocompatible and temperature sensitive self-assembled P123 based formulation for lavender oil solubilization that can be beneficial in the cosmetic industry wherein controlled release of fragrances and so forth is demanded.
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Affiliation(s)
- Oyais Ahmad Chat
- Physical Chemistry Division. Department of Chemistry, University of Kashmir , Srinagar-190006, Jammu and Kashmir, India
- Department of Chemistry, Government Degree College Pulwama-192301, Jammu and Kashmir, India
| | - Nighat Nazir
- Department of Chemistry, Islamia College of Science and Commerce , Hawal, Srinagar-190002, Jammu and Kashmir, India
| | - Parvaiz Ahmad Bhat
- Physical Chemistry Division. Department of Chemistry, University of Kashmir , Srinagar-190006, Jammu and Kashmir, India
- Department of Chemistry, Government Degree College Pulwama-192301, Jammu and Kashmir, India
| | | | | | - Aijaz Ahmad Dar
- Physical Chemistry Division. Department of Chemistry, University of Kashmir , Srinagar-190006, Jammu and Kashmir, India
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6
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Allen DT, Damestani N, Saaka Y, Lawrence MJ, Lorenz CD. Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface. Phys Chem Chem Phys 2018. [DOI: 10.1039/c7cp07611h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The encapsulation of testosterone enanthate into a sodium dodecyl sulphate monolayer.
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Affiliation(s)
- Daniel T. Allen
- Biological Physics & Soft Matter Group
- Department of Physics
- King's College London
- London WC2R 2LS
- UK
| | - Nikou Damestani
- Biological Physics & Soft Matter Group
- Department of Physics
- King's College London
- London WC2R 2LS
- UK
| | - Yussif Saaka
- Pharmaceutical Biophysics Group
- Institute of Pharmaceutical Science
- King's College London
- London SE1 9NH
- UK
| | - M. Jayne Lawrence
- Division of Pharmacy and Optometry
- School of Health Sciences
- The University of Manchester
- Manchester M13 9PT
- UK
| | - Christian D. Lorenz
- Biological Physics & Soft Matter Group
- Department of Physics
- King's College London
- London WC2R 2LS
- UK
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7
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Penfold J, Thomas R, Bradbury R, Tucker I, Petkov J, Jones C, Webster J. Probing the surface of aqueous surfactant-perfume mixed solutions during perfume evaporation. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.01.082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Tang X, Zou W, Koenig PH, McConaughy SD, Weaver MR, Eike DM, Schmidt MJ, Larson RG. Multiscale Modeling of the Effects of Salt and Perfume Raw Materials on the Rheological Properties of Commercial Threadlike Micellar Solutions. J Phys Chem B 2017; 121:2468-2485. [DOI: 10.1021/acs.jpcb.7b00257] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xueming Tang
- Department
of Chemical Engineering, University of Michigan, 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States
| | - Weizhong Zou
- Department
of Chemical Engineering, University of Michigan, 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States
| | - Peter H. Koenig
- Modeling and Simulation, The Procter & Gamble Company, 8611 Beckett Road, West Chester, Ohio 45069, United States
| | - Shawn D. McConaughy
- Personal Cleansing, Research & Development, The Procter & Gamble Company, Sharonville, Ohio 45241, United States
| | - Mike R. Weaver
- Analytic Sciences, The Procter & Gamble Company, Mason, Ohio 45040, United States
| | - David M. Eike
- Modeling and Simulation, The Procter & Gamble Company, 8611 Beckett Road, West Chester, Ohio 45069, United States
| | - Michael J. Schmidt
- Modeling and Simulation, The Procter & Gamble Company, 8611 Beckett Road, West Chester, Ohio 45069, United States
| | - Ronald G. Larson
- Department
of Chemical Engineering, University of Michigan, 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States
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9
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Bradbury R, Penfold J, Thomas RK, Tucker IM, Petkov JT, Jones C. Manipulating perfume delivery to the interface using polymer–surfactant interactions. J Colloid Interface Sci 2016; 466:220-6. [DOI: 10.1016/j.jcis.2015.12.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 12/19/2015] [Accepted: 12/21/2015] [Indexed: 10/22/2022]
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10
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Fan Y, Tang H, Strand R, Wang Y. Modulation of partition and localization of perfume molecules in sodium dodecyl sulfate micelles. SOFT MATTER 2016; 12:219-227. [PMID: 26458054 DOI: 10.1039/c5sm02145f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The influence of perfume molecules on the self-assembly of the anionic surfactant sodium dodecyl sulfate (SDS) and their localization in SDS micelles have been investigated by ζ potential, small angle X-ray scattering (SAXS), one- and two-dimensional NMR and isothermal titration microcalorimetry (ITC). A broad range of perfume molecules varying in octanol/water partition coefficients P are employed. The results indicate that the surface charge, size and aggregation number of the SDS micelles strongly depend on the hydrophobicity/hydrophilicity degree of perfume molecules. Three distinct regions along the log P values are identified. Hydrophilic perfumes (log P < 2.0) partially incorporate into the SDS micelles and do not lead to micelle swelling, whereas hydrophobic perfumes (log P > 3.5) are solubilized close to the end of the hydrophobic chains in the SDS micelles and enlarge the micelles with higher ζ potential and a larger aggregation number. The incorporated fraction and micelle properties show increasing tendency for the perfumes in the intermediate log P region (2.0 < log P < 3.5). Besides, the molecular conformation of perfume molecules also affects these properties. The perfumes with a linear chain structure or an aromatic group can penetrate into the palisade layer and closely pack with the SDS molecules. Furthermore, the thermodynamic parameters obtained from ITC show that the binding of the perfumes in the intermediate log P region is more spontaneous than those in the other two log P regions, and the micellization of SDS with the perfumes is driven by entropy.
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Affiliation(s)
- Yaxun Fan
- Key Laboratory of Colloid and Interface Science, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - Haiqiu Tang
- Procter & Gamble Technology (Beijing) Co. Ltd, Beijing 101312, P. R. China.
| | - Ross Strand
- Procter & Gamble Technology (Beijing) Co. Ltd, Beijing 101312, P. R. China.
| | - Yilin Wang
- Key Laboratory of Colloid and Interface Science, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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11
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Bradbury R, Penfold J, Thomas RK, Tucker IM, Petkov JT, Jones C. Enhanced perfume surface delivery to interfaces using surfactant surface multilayer structures. J Colloid Interface Sci 2016; 461:352-358. [DOI: 10.1016/j.jcis.2015.09.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 09/17/2015] [Accepted: 09/18/2015] [Indexed: 10/23/2022]
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12
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Lee BH. Thermodynamic Study on the Solubilization of p-Halogenated Phenol Derivatives in TTAB Solution. APPLIED CHEMISTRY FOR ENGINEERING 2014. [DOI: 10.14478/ace.2013.1084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Bradbury R, Penfold J, Thomas RK, Tucker IM, Petkov JT, Jones C. The impact of alkyl sulfate surfactant geometry and electrolyte on the co-adsorption of anionic surfactants with model perfumes at the air–solution interface. J Colloid Interface Sci 2013; 403:84-90. [DOI: 10.1016/j.jcis.2013.04.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 04/18/2013] [Accepted: 04/20/2013] [Indexed: 11/15/2022]
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