1
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Gotzias A, Tocci E, Sapalidis A. Solvent-Assisted Graphene Exfoliation from Graphite Using Umbrella Sampling Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:18437-18446. [PMID: 38051657 DOI: 10.1021/acs.langmuir.3c02692] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
We employed molecular dynamics (MD) simulations coupled with umbrella sampling to explore the thermodynamics governing the exfoliation of a single graphene layer from a graphitic substrate in five different solvents such as dimethylacetamide (DMA), N-methyl-2-pyrrolidone (NMP), dimethyl sulfoxide (DMSO), cyclohexane (CHX), and water. The substrate was modeled as a stack of three identical graphene layers with the graphene sheet undergoing exfoliation positioned on top of this stack. The initial configurations for each umbrella simulation were generated through steered MD simulations carried out along two distinct coordinates: one parallel and the other perpendicular to the graphene layers. Our analyses revealed a uniform wetting behavior for both the nanosheet and the graphitic substrate in all of the tested solvents. Consistent with experimental observations, the steered simulations confirmed that exfoliation is more favorable along the parallel direction than along the perpendicular one. All non-water solvents exhibit comparable effectiveness in the exfoliation of graphene. The calculated free energies of these solvents in parallel exfoliation consistently fell within the range of 90-100 kJ/mol/nm2. In perpendicular exfoliation, however, the corresponding energies converge to lower values. This difference is attributed to the nonequilibrium nature of the perpendicular exfoliation, primarily caused by the great steering velocity of the graphene sheet immediately after detachment from the substrate. This rapid motion of the nanosheet along the perpendicular coordinate results in an elevated system energy and heating.
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Affiliation(s)
- Anastasios Gotzias
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens 153 10, Greece
| | - Elena Tocci
- Institute on Membrane Technology, National Research Council, University of Calabria, Rende 87030, Italy
| | - Andreas Sapalidis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens 153 10, Greece
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2
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Gu S, Zhang L, de Campo L, O'Dell LA, Wang D, Wang G, Kong L. Lyotropic Liquid Crystal (LLC)-Templated Nanofiltration Membranes by Precisely Administering LLC/Substrate Interfacial Structure. MEMBRANES 2023; 13:549. [PMID: 37367753 DOI: 10.3390/membranes13060549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 05/20/2023] [Accepted: 05/23/2023] [Indexed: 06/28/2023]
Abstract
Mesoporous materials based on lyotropic liquid crystal templates with precisely defined and flexible nanostructures offer an alluring solution to the age-old challenge of water scarcity. In contrast, polyamide (PA)-based thin-film composite (TFC) membranes have long been hailed as the state of the art in desalination. They grapple with a common trade-off between permeability and selectivity. However, the tides are turning as these novel materials, with pore sizes ranging from 0.2 to 5 nm, take center stage as highly coveted active layers in TFC membranes. With the ability to regulate water transport and influence the formation of the active layer, the middle porous substrate of TFC membranes becomes an essential player in unlocking their true potential. This review delves deep into the recent advancements in fabricating active layers using lyotropic liquid crystal templates on porous substrates. It meticulously analyzes the retention of the liquid crystal phase structure, explores the membrane fabrication processes, and evaluates the water filtration performance. Additionally, it presents an exhaustive comparison between the effects of substrates on both polyamide and lyotropic liquid crystal template top layer-based TFC membranes, covering crucial aspects such as surface pore structures, hydrophilicity, and heterogeneity. To push the boundaries even further, the review explores a diverse array of promising strategies for surface modification and interlayer introduction, all aimed at achieving an ideal substrate surface design. Moreover, it delves into the realm of cutting-edge techniques for detecting and unraveling the intricate interfacial structures between the lyotropic liquid crystal and the substrate. This review is a passport to unravel the enigmatic world of lyotropic liquid crystal-templated TFC membranes and their transformative role in global water challenges.
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Affiliation(s)
- Senlin Gu
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Liangliang Zhang
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Liliana de Campo
- Australian Centre for Neutron Scattering, Australia Nuclear Science and Technology Organization (ANSTO), Sydney, NSW 2234, Australia
| | - Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Dong Wang
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Guang Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- Spallation Neutron Source Science Centre, Dongguan 523803, China
| | - Lingxue Kong
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
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3
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Moosavi SS, Zolghadr AR. Structural Transitions of Anionic, Cationic, and Nonionic Surfactant Solutions Confined between Amorphous SiO 2 Slabs: Molecular Dynamics Simulations. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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4
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Molecular Dynamics Simulation and Cryo-Electron Microscopy Investigation of AOT Surfactant Structure at the Hydrated Mica Surface. MINERALS 2022. [DOI: 10.3390/min12040479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Structural properties of the anionic surfactant dioctyl sodium sulfosuccinate (AOT or Aerosol-OT) adsorbed on the mica surface were investigated by molecular dynamics simulation, including the effect of surface loading in the presence of monovalent and divalent cations. The simulations confirmed recent neutron reflectivity experiments that revealed the binding of anionic surfactant to the negatively charged surface via adsorbed cations. At low loading, cylindrical micelles formed on the surface, with sulfate head groups bound to the surface by water molecules or adsorbed cations. Cation bridging was observed in the presence of weakly hydrating monovalent cations, while sulfate groups interacted with strongly hydrating divalent cations through water bridges. The adsorbed micelle structure was confirmed experimentally with cryogenic electronic microscopy, which revealed micelles approximately 2 nm in diameter at the basal surface. At higher AOT loading, the simulations reveal adsorbed bilayers with similar surface binding mechanisms. Adsorbed micelles were slightly thicker (2.2–3.0 nm) than the corresponding bilayers (2.0–2.4 nm). Upon heating the low loading systems from 300 K to 350 K, the adsorbed micelles transformed to a more planar configuration resembling bilayers. The driving force for this transition is an increase in the number of sulfate head groups interacting directly with adsorbed cations.
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5
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Nag A, Hayakawa T, Minase M, Ogawa M. Organophilic Clay with Useful Whiteness. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2979-2985. [PMID: 35196014 DOI: 10.1021/acs.langmuir.1c03467] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
An organophilic clay was obtained by the intercalation of dioctadecyldimethylammonium ions into the interlayer space of a purified bentonite. The organophilic clay was characterized by its excellent whiteness, which originated from the used purified bentonite with a low content of colored impurities, suitable for its practical application in paints, cosmetics, polymer additives, etc. The dioctadecyldimethylammonium-bentonite clay was applied as a support to accommodate polyaromatic molecules to afford luminescent hybrids with high luminescence efficiency, showing its usefulness as a component of photofunctional hybrid materials.
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Affiliation(s)
- Aniruddha Nag
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, 555 Moo 1 Payupnai, Wangchan, Rayong 21210, Thailand
| | - Takayuki Hayakawa
- Laboratory of Applied Clay Technology, Hojun Co., Ltd., An-naka, Gunma 379-0133, Japan
| | - Makoto Minase
- Laboratory of Applied Clay Technology, Hojun Co., Ltd., An-naka, Gunma 379-0133, Japan
| | - Makoto Ogawa
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, 555 Moo 1 Payupnai, Wangchan, Rayong 21210, Thailand
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6
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Gong X, Shuai L, Beingessner RL, Yamazaki T, Shen J, Kuehne M, Jones K, Fenniri H, Strano MS. Size Selective Corona Interactions from Self-Assembled Rosette and Single-Walled Carbon Nanotubes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2104951. [PMID: 35060337 DOI: 10.1002/smll.202104951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 11/24/2021] [Indexed: 06/14/2023]
Abstract
Nanoparticle corona phases, especially those surrounding anisotropic particles, are central to determining their catalytic, molecular recognition, and interfacial properties. It remains a longstanding challenge to chemically synthesize and control such phases at the nanoparticle surface. In this work, the supramolecular chemistry of rosette nanotubes (RNTs), well-defined hierarchically self-assembled nanostructures formed from heteroaromatic bicyclic bases, is used to create molecularly precise and continuous corona phases on single-walled carbon nanotubes (SWCNTs). These RNT-SWCNT (RS) complexes exhibit the lowest solvent-exposed surface area (147.8 ± 60 m-1 ) measured to date due to its regular structure. Through Raman spectroscopy, molecular-scale control of the free volume is also observed between the two annular structures and the effects of confined water. SWCNT photoluminescence (PL) within the RNT is also modulated considerably as a function of their diameter and chirality, especially for the (11, 1) species, where a PL increase compared to other species can be attributed to their chiral angle and the RNT's inward facing electron densities. In summary, RNT chemistry is extended to the problem of chemically defining both the exterior and interior corona interfaces of an encapsulated particle, thereby opening the door to precision control of core-shell nanoparticle interfaces.
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Affiliation(s)
- Xun Gong
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 66, Cambridge, MA, 02139, USA
| | - Liang Shuai
- National Institute for Nanotechnology and Department of Chemistry, University of Alberta, 11421 Saskatchewan Drive, Edmonton, Alberta, T6G2M9, Canada
| | - Rachel L Beingessner
- National Institute for Nanotechnology and Department of Chemistry, University of Alberta, 11421 Saskatchewan Drive, Edmonton, Alberta, T6G2M9, Canada
| | - Takeshi Yamazaki
- National Institute for Nanotechnology and Department of Chemistry, University of Alberta, 11421 Saskatchewan Drive, Edmonton, Alberta, T6G2M9, Canada
| | - Jianliang Shen
- Wenzhou Institute, University of Chinese Academy of Sciences, No.16 Xinsan Road, Hi-tech Industry Park, Wenzhou, Zhejiang, 325000, China
| | - Matthias Kuehne
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 66, Cambridge, MA, 02139, USA
| | - Kelvin Jones
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 66, Cambridge, MA, 02139, USA
| | - Hicham Fenniri
- Department of Chemical Engineering, Department of Bioengineering, Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA, 02115-5000, USA
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 66, Cambridge, MA, 02139, USA
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7
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Esteban-Arranz A, Pérez-Cadenas M, Muñoz-Andrés V, Guerrero-Ruiz A. Evaluation of graphenic and graphitic materials on the adsorption of Triton X-100 from aqueous solution. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 284:117161. [PMID: 33901979 DOI: 10.1016/j.envpol.2021.117161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 09/03/2020] [Accepted: 04/13/2021] [Indexed: 06/12/2023]
Abstract
Presently, graphenic nanomaterials are being studied as candidates for wastewater pollutant removal. In this study, two graphite oxides produced from natural graphite with different grain sizes (325 and 10 mesh), their respective reduced graphene oxides and one reduced graphene oxide with nitrogen functional groups were synthesized and tested to remove a surfactant model substrate, Triton X-100, from an aqueous solution. Kinetic experiments were carried out and adjusted to pseudo-first order equation, pseudo-second order equation, Elovich, Chain-Clayton and intra-particle diffusion models. Reduced graphene oxides displayed an instantaneous adsorption due to their accessible and hydrophobic surfaces, while graphite oxides hindered the TX100 adsorption rate due to their highly superficial oxygen content. Results from the adsorption isotherms showed that the Sips model perfectly described the TX100 adsorption behavior of these materials. Higher adsorption capacities were developed with reduced graphene oxides, being maximum for the material produced from the lower graphite grain size (qe = 3.55·10-6 mol/m2), which could be explained by a higher surface area (600 m2/g), a lower amount of superficial oxygen (O/C = 0.04) and a more defected structure (ID/IG = 0.85). Additionally, three commercial high surface area graphites in the range of 100-500 m2/g were evaluated for comparison purposes. In this case, better adsorption results were obtained with a more graphitic material, HSAG100 (qe = 1.72·10-6 mol/m2). However, the best experimental results of this study were obtained using synthesized graphenic materials.
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Affiliation(s)
- Adrián Esteban-Arranz
- Department of Inorganic and Technical Chemistry, National University of Distance Education (UNED), Senda Del Rey 9, 28040, Madrid, Spain.
| | - María Pérez-Cadenas
- Department of Inorganic and Technical Chemistry, National University of Distance Education (UNED), Senda Del Rey 9, 28040, Madrid, Spain.
| | - Vicenta Muñoz-Andrés
- Department of Inorganic and Technical Chemistry, National University of Distance Education (UNED), Senda Del Rey 9, 28040, Madrid, Spain.
| | - Antonio Guerrero-Ruiz
- Department of Inorganic and Technical Chemistry, National University of Distance Education (UNED), Senda Del Rey 9, 28040, Madrid, Spain.
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8
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Wolanin J, Barré L, Dalmazzone C, Bauer D. Investigation of the adsorption of a mixture of two anionic surfactants, AOT and SDBS, on silica at ambient temperature. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.126098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Shen H, Zou X, Yang H, Zhong W, Wang Y, Wang S, Deng M. Adsorption of Organic Molecules and Surfactants on Graphene: A Coarse-Grained Study. J Phys Chem A 2021; 125:700-711. [PMID: 33432811 DOI: 10.1021/acs.jpca.0c11111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The research studies on the adsorption of surfactants on graphene help us to know how to use surfactants to exfoliate graphene from graphite or functionalize the graphene surface. Among them, molecular dynamics (MD) simulation has been widely used to investigate the adsorption of organic molecules and surfactants on graphene. In particular, coarse-grained (CG) MD simulation greatly improves the computational efficiency by simplifying the complexity of the studied systems, allowing us to explore the structure and dynamics of complex systems on larger spatial scales and longer time scales. However, an accurate prediction of the adsorption of surfactants on graphene is required by optimizing the interaction between surfactants and graphene, which is often overlooked by some CG models. In this work, we found that an accurate prediction of the adsorption enthalpies of organic molecules on graphene can be achieved by optimizing the interactions between organic molecules and benzene. Meanwhile, we simulated the adsorption of a surfactant on single-layer and double-layer graphene nanosheets, respectively. Our results revealed that increasing the temperature would favor the interactions between hydrophilic groups of surfactants. In addition, we discovered that the surfactant prefers to be adsorbed on the inner surfaces of double-layer graphene compared with the outer surfaces, and this is owing to the dehydration in the middle of double-layer graphene, which is beneficial to the hydrophilic interactions between surfactant molecules inside the double-layer graphene.
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Affiliation(s)
- Hujun Shen
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Xuefeng Zou
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Hengxiu Yang
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Wenhui Zhong
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Yu Wang
- School of Chemistry and Materials Sciences, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Shuiyi Wang
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
| | - Mingsen Deng
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology, Guizhou Education University, No. 115, Gaoxin Road, Guiyang, Guizhou 550018, P. R. China
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10
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Khodaparast S, Marcos J, Sharratt WN, Tyagi G, Cabral JT. Surface-Induced Crystallization of Sodium Dodecyl Sulfate (SDS) Micellar Solutions in Confinement. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:230-239. [PMID: 33347298 DOI: 10.1021/acs.langmuir.0c02821] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We investigate the role of confinement on the onset of crystallization in subcooled micellar solutions of sodium dodecyl sulfate (SDS), examining the impact of sample volume, substrate surface energy, and surface roughness. Using small angle neutron scattering (SANS) and dynamic light scattering (DLS), we measure the crystallization temperature upon cooling and the metastable zone width (MSZW) for bulk 10-30 wt% SDS solutions. We then introduce a microdroplet approach to quantify the impact of surface free energy (18-65 mN/m) and substrate roughness (Rα ≃ 0-60 μm) on the kinetics of surface-induced crystallization through measurements of induction time (ti) under isothermal conditions. While ti is found to decrease exponentially with decreasing temperature (increasing subcooling) for all tested surfaces, increasing the surface energy could cause a significant further reduction of up to ∼40 fold. For substrates with the lowest surface energy and longest ti, microscale surface roughness is found to enhance crystal nucleation, in particular for Rα ≥ 10 μm. Finally, we demonstrate that tuning the surface energy and microscopic roughness can be effective routes to promote or delay nucleation in bulk-like volumes, thus greatly impacting the stability of surfactant solutions at lower temperatures.
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Affiliation(s)
- Sepideh Khodaparast
- School of Mechanical Engineering, University of Leeds, LS2 9JT Leeds, United Kingdom
| | - Julius Marcos
- Department of Chemical Engineering, Imperial College London, SW7 2AZ London, United Kingdom
| | - William N Sharratt
- Department of Chemical Engineering, Imperial College London, SW7 2AZ London, United Kingdom
| | - Gunjan Tyagi
- Department of Chemical Engineering, Imperial College London, SW7 2AZ London, United Kingdom
| | - João T Cabral
- Department of Chemical Engineering, Imperial College London, SW7 2AZ London, United Kingdom
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11
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Klebes J, Finnigan S, Bray DJ, Anderson RL, Swope WC, Johnston MA, Conchuir BO. The Role of Chemical Heterogeneity in Surfactant Adsorption at Solid-Liquid Interfaces. J Chem Theory Comput 2020; 16:7135-7147. [PMID: 33081471 DOI: 10.1021/acs.jctc.0c00759] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Chemical heterogeneity of solid surfaces disrupts the adsorption of surfactants from the bulk liquid. While its presence can hinder the performance of some formulations, bespoke chemical patterning could potentially facilitate controlled adsorption for nanolithography applications. Although some computational studies have investigated the impact of regularly patterned surfaces on surfactant adsorption, in reality, many interesting surfaces are expected to be stochastically disordered and this is an area unexplored via simulations. In this paper, we describe a new algorithm for the generation of randomly disordered chemically heterogeneous surfaces and use it to explore the adsorption behavior of four model nonionic surfactants. Using novel analysis methods, we interrogate both the global surface coverage (adsorption isotherm) and behavior in localized regions. We observe that trends in adsorption characteristics as surfactant size, head/tail ratio, and surface topology are varied and connect these to underlying physical mechanisms. We believe that our methods and approach will prove useful to researchers seeking to tailor surface patterns to calibrate nonionic surfactant adsorption.
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Affiliation(s)
- Jason Klebes
- IBM Research Europe, The Hartree Centre, Daresbury, Warrington WA4 4AD, United Kingdom.,School of Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Sophie Finnigan
- IBM Research Europe, The Hartree Centre, Daresbury, Warrington WA4 4AD, United Kingdom.,Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Wood Lane, London W12 0BZ, United Kingdom
| | - David J Bray
- The Hartree Centre, STFC Daresbury Laboratory, Warrington WA4 4AD, United Kingdom
| | - Richard L Anderson
- The Hartree Centre, STFC Daresbury Laboratory, Warrington WA4 4AD, United Kingdom
| | - William C Swope
- IBM Almaden Research Center, San Jose, California 95120, United States
| | | | - Breanndan O Conchuir
- IBM Research Europe, The Hartree Centre, Daresbury, Warrington WA4 4AD, United Kingdom
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12
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Reciprocal effects of multi-walled carbon nanotubes and oppositely charged surfactants in bulk water and at interfaces. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125296] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Yoon J, Ulissi ZW. Capturing Structural Transitions in Surfactant Adsorption Isotherms at Solid/Solution Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:819-826. [PMID: 31891511 DOI: 10.1021/acs.langmuir.9b02235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although adsorption isotherms of surfactants are critical in determining the relationship between interfacial properties and structures of surfactants, providing quantitative predictions of the isotherms remains challenging. This is especially true for adsorption at hard interfaces such as on two-dimensional (2D) layered materials or on nanoparticles where simulation techniques developed for fluid-fluid interfaces that dynamically change surface properties by adjusting unit cells do not apply. In this work, we predict nonideal adsorption at a solid-solution interface with a molecular thermodynamic theory (MTT) model that utilizes molecular dynamics (MD) simulations for the determination of free-energy parameters in the MTT. Furthermore, the MD/MTT model provides atomistic insights into the nonideal behavior of surfactants by capturing structural phases of the surfactants at the interface. Our approach captures structural transitions from the ideal state at low concentrations and then to the critical surface aggregation concentration (CSAC) and finally through the critical micelle concentration (CMC). We validate our model against the original MTT model by comparing predicted adsorption isotherms of a simplified surfactant system from both approaches. We further substantiate the applicability of our model in complex systems by providing adsorption isotherms in an aqueous sodium dodecyl sulfate (SDS)-graphene system, in good agreement with the experimental observations of the CSAC for the same system.
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Affiliation(s)
- Junwoong Yoon
- Department of Chemical Engineering , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
| | - Zachary W Ulissi
- Department of Chemical Engineering , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
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14
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Silva MET, Duvoisin S, Oliveira RL, Banhos EF, Souza AQL, Albuquerque PM. Biosurfactant production of Piper hispidum endophytic fungi. J Appl Microbiol 2019; 130:561-569. [PMID: 31340085 DOI: 10.1111/jam.14398] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 06/29/2019] [Accepted: 07/11/2019] [Indexed: 11/30/2022]
Abstract
AIMS To evaluate the production of biosurfactants by fungi isolated from the Amazonian species Piper hispidum (Piperaceae), and to determine the physico-chemical properties of the crude biosurfactant obtained from the most promising fungi. METHODS AND RESULTS A total of 117 endophytic fungi were isolated, and 50 were used to verify the production of biosurfactants. Of these, eight presented positive results in the drop collapse test, and emulsification index ranging from 20 to 78%. The most promising fungi, Ph III 23L and Ph II 22S (identified as Aspergillus niger and Glomerella cingulata, respectively) were recultivated for extraction and analysis of the biosurfactant's physico-chemical characteristics. The cultivation broth that presented the greatest decrease in surface tension (36%) was that of the A. niger, which reduced it from 68·0 to 44·0 mN m-1 . The lowest critical micellar concentration value was found for the same endophyte (14·93 mg ml-1 ). CONCLUSIONS Endophytes of P. hispidum proved to be interesting producers of biosurfactants and presented promising physico-chemical characteristics for applications in diverse industrial sectors. SIGNIFICANCE AND IMPACT OF THE STUDY Piper hispidum endophytic fungi can be used as a new source of biosurfactants, as these molecules present a significant market due to their wide industrial applications.
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Affiliation(s)
- M E T Silva
- Graduate Program in Biodiversity and Biotechnology - Bionorte, University of Amazonas State, Manaus, Amazonas, Brazil
| | - S Duvoisin
- Laboratory of Chemistry Applied and Technology, School of Technology, University of Amazonas State, Manaus, Amazonas, Brazil
| | - R L Oliveira
- Laboratory of Chemistry Applied and Technology, School of Technology, University of Amazonas State, Manaus, Amazonas, Brazil
| | - E F Banhos
- Education Sciences Institute, Para West Federal University, Santarém, Pará, Brazil
| | - A Q L Souza
- Graduate Program in Biodiversity and Biotechnology - Bionorte, University of Amazonas State, Manaus, Amazonas, Brazil.,Graduate Program in Biotechnology and Amazon Natural Resources, University of Amazonas State, Manaus, Amazonas, Brazil.,Faculty of Agricultural Sciences, Federal University of Amazonas, Manaus, Amazonas, Brazil
| | - P M Albuquerque
- Graduate Program in Biodiversity and Biotechnology - Bionorte, University of Amazonas State, Manaus, Amazonas, Brazil.,Laboratory of Chemistry Applied and Technology, School of Technology, University of Amazonas State, Manaus, Amazonas, Brazil.,Graduate Program in Biotechnology and Amazon Natural Resources, University of Amazonas State, Manaus, Amazonas, Brazil
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15
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Chowdhury S, Rakshit A, Acharjee A, Saha B. Novel Amphiphiles and Their Applications for Different Purposes with Special Emphasis on Polymeric Surfactants. ChemistrySelect 2019. [DOI: 10.1002/slct.201901160] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Suman Chowdhury
- Homogeneous Catalysis LaboratoryDepartment Of ChemistryThe University Of Burdwan, Golapbag, Burdwan, Pin - 713104 West Bengal India
| | - Atanu Rakshit
- Homogeneous Catalysis LaboratoryDepartment Of ChemistryThe University Of Burdwan, Golapbag, Burdwan, Pin - 713104 West Bengal India
| | - Animesh Acharjee
- Homogeneous Catalysis LaboratoryDepartment Of ChemistryThe University Of Burdwan, Golapbag, Burdwan, Pin - 713104 West Bengal India
| | - Bidyut Saha
- Homogeneous Catalysis LaboratoryDepartment Of ChemistryThe University Of Burdwan, Golapbag, Burdwan, Pin - 713104 West Bengal India
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Zhou P, Hou J, Yan Y, Wang J, Chen W. Effect of Aggregation and Adsorption Behavior on the Flow Resistance of Surfactant Fluid on Smooth and Rough Surfaces: A Many-Body Dissipative Particle Dynamics Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8110-8120. [PMID: 31075000 DOI: 10.1021/acs.langmuir.8b04278] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
To study the effect of surfactant on the resistance of wall-bound flow, the adsorption and aggregation behaviors of surfactant fluid on both smooth and groove-patterned rough surface are investigated through many-body dissipative particle dynamics (MDPD) simulation. The MDPD models of surfactants were carefully parametrized and have been validated to be able to simulate the aggregation and adsorption behavior of surfactants. The simulation results show that the surfactant in laminar flow can only increase the flow resistance on the smooth surface. On the rough surface, surfactant with strong adsorption performance on the channel wall shows a drag reduction effect at moderate concentration. The surfactant with weak adsorption properties can enhance the flow resistance, which is even more significant than that of those surfactants with no adsorption capacity. Although heating (high temperature) can generally reduce the viscosity and flow resistance of surfactant fluid, it would cause a poor drag reduction efficiency. It may arise from the destruction of the adsorption layer and the interruption of the fluid/boundary interface. Surfactant adsorption can tune the roughness of the fluid boundary on either the smooth or rough surface in a different manner, which turns out to be highly correlated to the change in flow resistance. Compared with the adsorption layer, surfactant in the bulk fluid makes a greater contribution to enhancing the flow resistance as the concentration rises. This study is expected to be helpful in guiding the application of surfactants on the micro- and nanoscale such as lab-on-a-chip nanodevices and EOR in a low-permeability porous medium.
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Allen FJ, Truscott CL, Gutfreund P, Welbourn RJL, Clarke SM. Potassium, Calcium, and Magnesium Bridging of AOT to Mica at Constant Ionic Strength. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5753-5761. [PMID: 30950624 DOI: 10.1021/acs.langmuir.9b00533] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The bridging effect of a series of common cations between the anionic mica surface and the AOT anion has been studied in a condition of constant ionic strength and surfactant concentration. It was found that sodium ions did not show any bridging effect in this system; however, calcium, magnesium, and potassium all caused adsorption of the organic to the mica surface. The concentrations at which bridging occurred was probed, revealing that only a very low bridging cation concentration was required for binding. The bridged layer stability was also investigated, and the interaction was shown to be a weak one, with the bound layer in equilibrium with the species in the bulk and easily removed. Even maintaining ionic strength and bridging ion concentration was not sufficient to retain the layer when the free organic in solution was removed.
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Affiliation(s)
- Finian J Allen
- Department of Chemistry and BP Institute , University of Cambridge , Cambridge , Cambs CB2 1EW , U.K
| | - Chris L Truscott
- Department of Chemistry and BP Institute , University of Cambridge , Cambridge , Cambs CB2 1EW , U.K
| | - Philipp Gutfreund
- Institut Laue Langevin , 71 avenue des Martyrs , Grenoble 38000 , France
| | - Rebecca J L Welbourn
- ISIS Pulsed Neutron Facility, Rutherford Appleton Laboratory , Harwell Science and Innovation Campus, STFC , Didcot , Oxon OX11 0QX , U.K
| | - Stuart M Clarke
- Department of Chemistry and BP Institute , University of Cambridge , Cambridge , Cambs CB2 1EW , U.K
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Chia CL, Alloway RM, Jephson I, Clarke SM, Filip SV, Siperstein FR, Avendaño C. Competitive Adsorption of a Multifunctional Amine and Phenol Surfactant with Ethanol on Hematite from Nonaqueous Solution. J Phys Chem B 2019; 123:1375-1383. [PMID: 30667225 DOI: 10.1021/acs.jpcb.8b09704] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Surfactants, which contain phenol and amine groups, are commonly used in industries to protect metallic surfaces, and their efficiency depends strongly on factors such as pressure and temperature, solvent properties, and the presence of other surfactants in the system. In this work, we present a molecular simulation study of the competitive adsorption between a multifunctional phenol and amine surfactant model and ethanol at the oil/solid interface formed between iso-octane and a model hematite (α-Fe2O3) slab. We show that the surfactant strongly adsorbs at the iso-octane/hematite interface in the absence of ethanol at moderate temperatures. As the concentration of ethanol is increased, the ethanol molecules compete effectively for the adsorption sites on the iron oxide surface. This competition drives the surfactant molecules to remain in the bulk solution, while ethanol forms ordered and strongly coordinated layers at the oil/solid interface, despite the well-known complete miscibility of ethanol in iso-octane in bulk under standard conditions. Potential of mean force calculations show that the free energy of adsorption of the surfactant is approximately two times larger than that for a single ethanol molecule, but the simulations also reveal that a single surfactant chain needs to displace up to five ethanol molecules to adsorb onto the surface. The end result is more favorable ethanol adsorption which agrees with the experimental analysis of similar oil/iron oxide systems also reported in this work.
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Affiliation(s)
- Chung-Lim Chia
- School of Chemical Engineering and Analytical Science , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
| | - Richard M Alloway
- Department of Chemistry and BP Institute , Cambridge University , Cambridge CB2 1EW , U.K
| | - Izaak Jephson
- Department of Chemistry and BP Institute , Cambridge University , Cambridge CB2 1EW , U.K
| | - Stuart M Clarke
- Department of Chemistry and BP Institute , Cambridge University , Cambridge CB2 1EW , U.K
| | - Sorin V Filip
- BP Formulated Products Technology, Research and Innovation, Technology Centre , Whitchurch Hill, Pangbourne, Berkshire RG8 7QR , U.K
| | - Flor R Siperstein
- School of Chemical Engineering and Analytical Science , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
| | - Carlos Avendaño
- School of Chemical Engineering and Analytical Science , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
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Khedr A, Striolo A. DPD Parameters Estimation for Simultaneously Simulating Water–Oil Interfaces and Aqueous Nonionic Surfactants. J Chem Theory Comput 2018; 14:6460-6471. [DOI: 10.1021/acs.jctc.8b00476] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Abeer Khedr
- Chemical Engineering Department, University College London, London, United Kingdom
| | - Alberto Striolo
- Chemical Engineering Department, University College London, London, United Kingdom
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Algoul ST, Sengupta S, Bui TT, Velarde L. Tuning the Surface Ordering of Self-Assembled Ionic Surfactants on Semiconducting Single-Walled Carbon Nanotubes: Concentration, Tube Diameter, and Counterions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9279-9288. [PMID: 30008207 DOI: 10.1021/acs.langmuir.8b01813] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report direct spectroscopic measurements of the macromolecular organization of ionic surfactants on the surface of semiconducting single-walled carbon nanotubes (SWCNTs) within solution-processed thin films. By using vibrational sum frequency generation (VSFG) spectroscopy, sensitive measurements of interfacial surfactant ordering were obtained as a function of surfactant concentration for sodium dodecyl sulfate (SDS)-encapsulated (6,5) and (7,6) SWCNTs with and without excess electrolytes. Anionic surfactants are known to effectively stabilize SWCNTs. The current models suggest a strong influence of the dispersion conditions on the surfactant interfacial macromolecular organization and self-assembly. Direct experimental probes of such an organization using nanotubes of specific chirality are needed to validate the existing models. We found that as the bulk SDS concentration increases near the surfactant critical micelle concentration, the interfacial ordering increased, approaching the formation of cylindrical-like micelles with the nanotube at the core. At the higher surfactant concentrations measured here, the (6,5) SWCNTs produced more ordered structures relative to those with the (7,6) SWCNTs. The relatively larger-diameter (7,6) chiral tubes support enhanced van der Waals (vdW) interactions between the tube carbon surface and the surfactant methylene chain groups that likely increase the density of gauche defects. A new effect arises when the precursor solution is exposed to a small concentration of divalent Ca2+ counterions. We postulate that a salt-bridging configuration on such highly curved surfaces decreases the ordering of interfacial surfactant molecules, resulting in compact, disordered structures. However, this phenomenon was not observed with excess Na+ ions at the same ionic strength. Instead, a modest increase in surfactant ordering was observed with the excess monovalent electrolyte. These results provide new insights for thin film solution processing of vdW nanomaterials and demonstrate that VSFG is a sensitive probe of surfactant organization on nanostructures.
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Affiliation(s)
- Soha T Algoul
- Department of Chemistry , University at Buffalo, State University of New York , Buffalo , New York 14260-3000 , United States
| | - Sanghamitra Sengupta
- Department of Chemistry , University at Buffalo, State University of New York , Buffalo , New York 14260-3000 , United States
| | - Thomas T Bui
- Department of Chemistry , University at Buffalo, State University of New York , Buffalo , New York 14260-3000 , United States
| | - Luis Velarde
- Department of Chemistry , University at Buffalo, State University of New York , Buffalo , New York 14260-3000 , United States
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Zhou P, Hou J, Yan Y, Wang J. The effect of surfactant adsorption on surface wettability and flow resistance in slit nanopore: A molecular dynamics study. J Colloid Interface Sci 2018; 513:379-388. [DOI: 10.1016/j.jcis.2017.11.045] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 11/14/2017] [Accepted: 11/15/2017] [Indexed: 11/25/2022]
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Allen FJ, Griffin LR, Alloway RM, Gutfreund P, Lee SY, Truscott CL, Welbourn RJL, Wood MH, Clarke SM. An Anionic Surfactant on an Anionic Substrate: Monovalent Cation Binding. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7881-7888. [PMID: 28731354 DOI: 10.1021/acs.langmuir.7b01837] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Neutron reflectometry has been used to study the adsorption of the anionic surfactant bis(2-ethylhexyl) sulfosuccinate cesium salt on the anionic surface of mica. Evidence of significant adsorption is reported. The adsorption is reversible and changes little with pH. This unexpected adsorption behavior of an anionic molecule on an anionic surface is discussed in terms of recent models for surfactant adsorption such as cation bridging, where adsorption has been reported with the divalent ion calcium but not previously observed with monovalent ions.
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Affiliation(s)
- Finian J Allen
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
| | - Lucy R Griffin
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
| | - Richard M Alloway
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
| | | | - Seung Yeon Lee
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
| | - Chris L Truscott
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
| | - Rebecca J L Welbourn
- ISIS Pulsed Neutron Facility, Harwell Science and Innovation Campus, STFC, Rutherford Appleton Laboratory , Didcot, Oxon OX11 0QX, United Kingdom
| | - Mary H Wood
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
| | - Stuart M Clarke
- Department of Chemistry and BP Institute, University of Cambridge , Cambridge CB2 1EW, United Kingdom
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