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Chen Q, Zheng J. Self-assembly and structures of nanoscale double emulsion droplets through coarse-grained molecular dynamics simulations. SOFT MATTER 2023; 19:7731-7743. [PMID: 37789812 DOI: 10.1039/d3sm00656e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Examples of self-assembled multiple emulsion droplets on the nanometre scale are very rare. In this work, we use coarse-grained (CG) molecular dynamics simulations to study the self-assembly of ternary mixtures consisting of water, n-heptane, and nonionic surfactant tetraethylene glycol monododecyl ether (C12E4). The water volume fractions studied are 1%, 3%, and 5%, respectively. Various nanoscale emulsions are obtained in a spontaneous process. When the water/surfactant volume ratio vm/s = 1.0/1.0, the obtained emulsion droplets are identified as oil-in-water-in-oil (O/W/O) double types, consisting of an oil core, an inner surfactant layer, a water layer, and an outer surfactant layer. The water molecules are distributed around the hydrophilic ends of the surfactants, while the hydrophobic ends of the surfactants wrap the oil cores and penetrate into the oil bulk. Hydrogen-bond interactions among water and the hydrophilic ends of the surfactants form cross-links that stabilize the double emulsion droplets. The sizes of all the oil cores inside the droplets are <6 nm in diameter, even with the highest water volume fraction of 5%. Both the concentration of free water molecules on the order of 10-6 mol/cm3 and the favourable energy change during emulsion formation indicate that the emulsion droplets are thermodynamically stable. In contrast, for vm/s = 1.0/5.5, no double emulsion but a simple water-in-oil emulsion was observed, with morphologies evolving from oblate to bicontinuous phases with an increase in the water volume fraction from 1% to 5%. Our coarse-grained molecular dynamics simulations provide valuable insight for the preparation of nanoscale double emulsions and the characterization of their structures.
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Affiliation(s)
- Qiubo Chen
- Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore.
| | - Jianwei Zheng
- Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore.
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2
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Bjørnestad VA, Li X, Tribet C, Lund R, Cascella M. Micelle kinetics of photoswitchable surfactants: Self-assembly pathways and relaxation mechanisms. J Colloid Interface Sci 2023; 646:883-899. [PMID: 37235934 DOI: 10.1016/j.jcis.2023.05.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/19/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023]
Abstract
HYPOTHESIS A key question in the kinetics of surfactant self-assembly is whether exchange of unimers or fusion/fission of entire micelles is the dominant pathway. In this study, an isomerizable surfactant is used to explore fundamental out-of-equilibrium kinetics and mechanisms for growth and dissolution of micelles. EXPERIMENTS The kinetics of cationic surfactant 4-butyl-4'-(3-trimethylammoniumpropoxy)-phenylazobenzene was studied using molecular dynamics simulations. The fusion and exchange processes were investigated using umbrella sampling. Equilibrium states were validated by comparison with small-angle X-ray scattering data. The photo-isomerization event was simulated by modifying the torsion potential of the photo-responsive group to emulate the trans-to-cis transition. FINDINGS Micelle growth is dominated by unimer exchange processes, whereas, depending on the conditions, dissolution can occur both through fission and unimer expulsion. Fusion barriers increase steeply with the aggregation number making this an unlikely pathway to equilibrium for micelles of sizes that fit with the experimental data. The barriers for unimer expulsion remain constant and are much lower for unimer insertion, making exchange more likely at high aggregation. When simulating photo-conversion events, both fission and a large degree of unimer expulsion can occur depending on the extent of the out-of-equilibrium stress that is put on the system.
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Affiliation(s)
- Victoria Ariel Bjørnestad
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, Sem Sælands vei 26, Oslo, 0371, Norway
| | - Xinmeng Li
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, Sem Sælands vei 26, Oslo, 0371, Norway
| | - Christophe Tribet
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, Paris, 75005, France
| | - Reidar Lund
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, Sem Sælands vei 26, Oslo, 0371, Norway.
| | - Michele Cascella
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, Sem Sælands vei 26, Oslo, 0371, Norway.
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3
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Anderson RL, Gunn DSD, Taddese T, Lavagnini E, Warren PB, Bray DJ. Phase Behavior of Alkyl Ethoxylate Surfactants in a Dissipative Particle Dynamics Model. J Phys Chem B 2023; 127:1674-1687. [PMID: 36786752 PMCID: PMC9969514 DOI: 10.1021/acs.jpcb.2c08834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
We present a dissipative particle dynamics (DPD) model capable of capturing the liquid state phase behavior of nonionic surfactants from the alkyl ethoxylate (CnEm) family. The model is based upon our recent work [Anderson et al. J. Chem. Phys. 2017, 147, 094503] but adopts tighter control of the molecular structure by setting the bond angles with guidance from molecular dynamics simulations. Changes to the geometry of the surfactants were shown to have little effect on the predicted micelle properties of sampled surfactants, or the water-octanol partition coefficients of small molecules, when compared to the original work. With these modifications the model is capable of reproducing the binary water-surfactant phase behavior of nine surfactants (C8E4, C8E5, C8E6, C10E4, C10E6, C10E8, C12E6, C12E8, and C12E12) with a good degree of accuracy.
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4
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Mehebub Rahaman S, Chakraborty M, Mandal T, Kundu S, Dhibar S, Kumar D, Ibrahim SM, Chakravarty M, Saha B. Mechanically tuned lanthanum carbonate nanorods in water-in-oil microemulsion scaffolds. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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5
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Carro N, Mejía A. Prediction of Micellar Thermodynamics of Nonionic Surfactants Based on the Square Gradient Theory. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:14527-14539. [PMID: 36394511 DOI: 10.1021/acs.langmuir.2c00830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
A geometry-dependent contribution based on the square gradient theory of van der Waals is proposed as a predictive modification of the interfacial energy contribution for the micellar thermodynamic theory. The model has an analytic prediction for the spherical and cylindrical geometries. For ellipsoidal geometry, a simple yet physically meaningful approximation is proposed. The critical micelle concentration (CMC) and the surface tension isotherm under the new contribution are compared with the classical theory. The modified model describes qualitatively the available experimental data and the surface isotherm, showing an improvement in the predictions of the CMC.
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Affiliation(s)
- Nicolás Carro
- Departamento de Ingeniería Química, Universidad de Concepción, Concepción4030000, Chile
| | - Andrés Mejía
- Departamento de Ingeniería Química, Universidad de Concepción, Concepción4030000, Chile
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6
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Mochizuki K. The packing parameter of bare surfactant does not necessarily indicate morphological changes. J Colloid Interface Sci 2022; 631:17-21. [DOI: 10.1016/j.jcis.2022.10.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 11/11/2022]
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7
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Molecular dynamics and network analysis reveal the contrasting roles of polar solutes within organic phase amphiphile aggregation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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8
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Molecular dynamics simulation reveals the reliability of Brij-58 nanomicellar drug delivery systems for flurbiprofen. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Peroukidis SD, Stott IP, Mavrantzas VG. Coarse-Grained Model Incorporating Short- and Long-Range Effective Potentials for the Fast Simulation of Micelle Formation in Solutions of Ionic Surfactants. J Phys Chem B 2022; 126:5555-5569. [PMID: 35838193 DOI: 10.1021/acs.jpcb.2c02751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A coarse-grained model comprising short- and long-range effective potentials, parametrized with the iterative Boltzmann inversion (IBI) method, is presented for capturing micelle formation in aqueous solutions of ionic surfactants using as a model system sodium dodecyl sulfate (SDS). In the coarse-grained (CG) model, each SDS molecule is represented as a sequence of four beads while each water molecule is modeled as a single bead. The proposed CG scheme involves ten potential energy functions: four of them describe bonded interactions and control the distribution functions of intramolecular degrees of freedom (bond lengths, valence angles, and dihedrals) along an SDS molecule while the other six account for intermolecular interactions between pairs of SDS and water beads and control the radial distribution functions. The nonbonded effective potentials between coarse-grained SDS molecules extend up to about 12 nm and capture structural and morphological features of the micellar solution both at short and long distances. The long-range component of these potentials, in particular, captures correlations between surfactant molecules belonging to different micelles and is essential to describe ordering associated with micelle formation. A new strategy is introduced for determining the effective potentials through IBI by using information (target distribution functions) extracted from independent atomistic simulations of a micellar reference system (a salt-free SDS solution at total surfactant concentration cT equal to 103 mM, temperature T equal to 300 K, and pressure P equal to 1 atm) obtained through a multiscale approach described in an earlier study. It employs several optimization steps for bonded and nonbonded interactions and a gradual parametrization of the short- and long-range components of the latter, followed by reparametrization of the bonded ones. The proposed CG model can reproduce remarkably accurately the microstructure and morphology of the reference system within only a few hours of computational time. It is therefore very promising for future studies of structural and morphological behavior of various liquid surfactant formulations.
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Affiliation(s)
- Stavros D Peroukidis
- Department of Chemical Engineering, University of Patras and FORTH-ICE/HT, GR 26504, Patras, Greece
| | - Ian P Stott
- Unilever Research and Development Port Sunlight, Bebington CH63 3JW, United Kingdom
| | - Vlasis G Mavrantzas
- Department of Chemical Engineering, University of Patras and FORTH-ICE/HT, GR 26504, Patras, Greece.,Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland
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10
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Arkhipov VP, Arkhipov RV, Petrova EV, Filippov A. Abnormal diffusion behavior and aggregation of oxyethylated alkylphenols in aqueous solutions near their cloud point. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Navarro-Aquino D, Medeiros M. Molecular simulation of pentaethylene glycol monooctyl ether micelles in water. Prediction of the micellization Gibbs energy. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Duran T, Costa A, Gupta A, Xu X, Zhang H, Burgess D, Chaudhuri B. Coarse-Grained Molecular Dynamics Simulations of Paclitaxel-Loaded Polymeric Micelles. Mol Pharm 2022; 19:1117-1134. [PMID: 35243863 DOI: 10.1021/acs.molpharmaceut.1c00800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A continuous manufacturing technology based on coaxial turbulent jet in coflow was previously developed to produce paclitaxel-loaded polymeric micelles. Herein, coarse-grained molecular dynamics (CG-MD) simulations were implemented to better understand the effect of the material attributes (i.e., the drug-polymer ratio and the ethanol concentration) and process parameters (i.e., temperature) on the self-assembly process of polymeric micelles as well as to provide molecular details on micelle instability. An all-atom (AA) poly (ethylene glycol)-poly (lactic acid) (PEG-PLA) polymer model was developed as the reference for parameterizing a coarse-grained (CG) model, and the AA polymer model was further validated with experimental glass transition temperature (Tg). The model transferability was verified by comparing structural properties between the AA and CG models. The CG model was further validated with experimental data, including micelle particle size measurements and drug encapsulation efficiency. Furthermore, the encapsulation of paclitaxel into the polymeric micelles was included in the simulations, taking into consideration the interactions between the paclitaxel and the polymers. The results from various points of view demonstrated a strong dependence of the shape of the micelles on the drug encapsulation, with micelles transitioning from spherical to ellipsoidal structures with an increasing paclitaxel amount. Simulation data were also used to identify the critical aggregation number (i.e., the number of polymer and drug molecules required for transition from one shape to another). Improved micellar structural stability was found with a larger micellar size and less solvent accessibility. Lastly, an evaluation was performed on the micellar dissociation free energy using a steered molecular dynamics simulation over a range of temperatures and ethanol concentrations. These simulations revealed that at higher ethanol and temperature conditions, micelles become destabilized, resulting in greater paclitaxel release. The increased drug release was determined to originate from the solvation of the hydrophobic core, which promoted micellar swelling and an associated reduction in hydrophobic interactions, leading to a loosely packed micellar structure.
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Affiliation(s)
- Tibo Duran
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Antonio Costa
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Anand Gupta
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Xiaoming Xu
- Office of Testing and Research, Office of Pharmaceutical Quality, U.S. Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Hailing Zhang
- Office of Lifecycle Drug Product, Office of Pharmaceutical Quality, U.S. Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Diane Burgess
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Bodhisattwa Chaudhuri
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06269, United States.,Institute of Materials Sciences (IMS), University of Connecticut, Storrs, Connecticut 06269, United States.,Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
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13
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Elahi A, Bidault X, Chaudhuri S. Temperature-Transferable Coarse-Grained Model for Poly(propylene oxide) to Study Thermo-Responsive Behavior of Triblock Copolymers. J Phys Chem B 2022; 126:292-307. [PMID: 34982567 DOI: 10.1021/acs.jpcb.1c06318] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Thermo-responsive behavior of ethylene oxide (EO)-propylene oxide (PO) copolymers makes them suitable for many potential applications. Reproducing the origins of the tunable properties of EO-PO copolymers using coarse-grained (CG) models such as the MARTINI force field is critically important for building a better understanding of their behavior. In the present work, we have investigated the effects of coarse-graining on the water-polymer interaction across a temperature range. We compared the performance of different all-atom force fields to find the most appropriate one for the purpose of PO block parameterization in the MARTINI platform. We parameterized a CG temperature-dependent PO model based on the reproduction of the atomistic free energy of transfer of propylene oxide trimer from octane to water over a range of temperatures (20-60 °C) and compared the atomistic bond and angle distributions. Then, we used the model to study the effects of EO/PO ratio, molecular weight, and concentration on the thermo-responsive behavior of EO-PO copolymers in water. The results show an excellent agreement with experiments in different areas. Our temperature-dependent model reproduces (1) micellar phase above critical micelle temperature (CMT) and unimer phase below CMT for different Pluronics (a class of EO-PO triblock copolymers) spanning many EO/PO ratios and molecular weights; (2) spherical-to-rodlike micellar shape transition for Pluronics with 60 wt % of PO content or more; (3) diffusion coefficients for Pluronics with high PO content (P104 Pluronic with a PO mass of 3500 g mol-1) across a broad range of temperatures; and (4) micelle core size and micelle diameter similar to experimental results. Overall, our model improves the temperature sensitivity of EO-PO copolymers of existing models significantly, particularly for copolymers that are dominated by PO agents.
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Affiliation(s)
- Arash Elahi
- Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Xavier Bidault
- Department of Civil, Materials, and Environmental Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Santanu Chaudhuri
- Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States.,Department of Civil, Materials, and Environmental Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
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14
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Bhat A, Harris MT, Jaeger VW. Structural Insights into Self-Assembled Aerosol-OT Aggregates in Aqueous Media Using Atomistic Molecular Dynamics. J Phys Chem B 2021; 125:13789-13803. [PMID: 34898216 DOI: 10.1021/acs.jpcb.1c07136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In water, the surfactant dioctyl sulfosuccinate (Aerosol-OT or AOT) exhibits diverse aggregate structures, ranging from micelles to lamella. An atomic-level understanding, however, of the formation and structure of these aggregates is lacking. Herein, using atomistic molecular dynamics (MD) with microsecond-long simulations, self-assembly of AOT in water is studied for concentrations of 1, 7.2, and 20 wt % at 293 K and for 7.2 wt % at 353 K. Assembly proceeds through stepwise association and dissociation of single AOT molecules, and the fusion and fission of AOT clusters. At 293 K, AOT self-assembles into either (i) spherical micelles (1 wt %), (ii) biphasic systems consisting of rod-like and prolate spheroidal micelles (7.2 wt %), or (iii) bilayers (20 wt %). We hypothesize that the observed rod-like structure is a precursor to lamellar microdomains found experimentally in biphasic dispersions. Increasing temperature to 353 K at 7.2 wt % results in a system consisting of prolate micelles but no rod-like micelles. Simulated phase behavior agrees with previously published experimental observations. Individual aggregates formed during self-assembly are identified using graph theory. Structural metrics of these aggregates like the radius of gyration, shape anisotropy, and prolateness are presented. Trends in structural metrics quantitatively reflect how shapes and sizes of AOT aggregates vary with surfactant concentration and temperature. These simulations provide deeper insight into open questions in the scientific community and demonstrate a method to generate physics-based micelle structures that can be used to rationalize experimental observations.
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Affiliation(s)
- Anuradha Bhat
- Division of Environmental and Ecological Engineering, Purdue University, Potter Engineering Center, 500 Central Drive, West Lafayette, Indiana 47907, United States
| | - Michael T Harris
- Davidson School of Chemical Engineering, Purdue University, Forney Hall of Chemical Engineering 1060, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Vance W Jaeger
- Department of Chemical Engineering, University of Louisville, Ernst Hall, Room 312, 216 Eastern Parkway, Louisville, Kentucky 40292, United States
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15
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Janni DS, Rajput G, Pandya N, Subramanyam G, Varade D. Interfacial properties of novel surfactants based on maleic and succinic acid for potential application in personal care. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Urata S, Kuo AT, Murofushi H. Self-assembly of the cationic surfactant n-hexadecyl-trimethylammonium chloride in methyltrimethoxysilane aqueous solution: classical and reactive molecular dynamics simulations. Phys Chem Chem Phys 2021; 23:14486-14495. [PMID: 34184007 DOI: 10.1039/d1cp01462e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A flexible aerogel polymerized from methyltrimethoxysilane (MTMS) shows great promise as a high-performance insulator owing to its substantially low thermal conductivity and mechanical flexibility, attributed to its porous microstructure and organic-inorganic hybridization, respectively, which promote its industrial applications. Conventionally, the cationic surfactant n-hexadecyltrimethylammonium chloride (CTAC) is utilized to experimentally control the nanoscale microstructure and, consequently, the flexibility of the MTMS aerogel; however, the mechanism through which CTAC prevents MTMS aggregation in the solution is not yet fully understood. This study unravels the role of CTAC in preventing MTMS aggregation in aqueous solution using both classical and reactive molecular dynamics simulations. We found that CTAC molecules can form self-aggregates even when the polymerization of MTMS progresses and then the MTMS-derived oligomer turns to be hydrophobic in aqueous solution. In summary, the self-assemblies of CTAC disperse among the MTMS associations and effectively prevent MTMS clustering, and this is considered as the key mechanism underlying the formation of a flexible microstructure of the hybrid aerogel.
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Affiliation(s)
- Shingo Urata
- Innovative Technology Laboratories, AGC Inc., 1-1 Suehiro-cho, Tsurumi-ku, Yokohama, Japan.
| | - An-Tsung Kuo
- Materials Integration Laboratories, AGC Inc., Japan
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17
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Alessandri R, Grünewald F, Marrink SJ. The Martini Model in Materials Science. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2008635. [PMID: 33956373 DOI: 10.1002/adma.202008635] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/15/2021] [Indexed: 06/12/2023]
Abstract
The Martini model, a coarse-grained force field initially developed with biomolecular simulations in mind, has found an increasing number of applications in the field of soft materials science. The model's underlying building block principle does not pose restrictions on its application beyond biomolecular systems. Here, the main applications to date of the Martini model in materials science are highlighted, and a perspective for the future developments in this field is given, particularly in light of recent developments such as the new version of the model, Martini 3.
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Affiliation(s)
- Riccardo Alessandri
- Zernike Institute for Advanced Materials and Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, Groningen, 9747AG, The Netherlands
| | - Fabian Grünewald
- Zernike Institute for Advanced Materials and Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, Groningen, 9747AG, The Netherlands
| | - Siewert J Marrink
- Zernike Institute for Advanced Materials and Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, Groningen, 9747AG, The Netherlands
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18
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Crespo EA, Vega LF, Pérez-Sánchez G, Coutinho JAP. Unveiling the phase behavior of C iE j non-ionic surfactants in water through coarse-grained molecular dynamics simulations. SOFT MATTER 2021; 17:5183-5196. [PMID: 33942825 DOI: 10.1039/d1sm00362c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Poly(oxyethylene) alkyl ethers, usually denoted by CiEj surfactants, exhibit a rich phase behavior in water, self-assembling to form a variety of 3-D structures with a controllable morphology that find multiple applications across different industrial segments. Hence, being able to describe and understand the effect of molecular structure on the phase behavior of these systems is highly relevant for the efficient design of new materials and their applications. Considering the promising results obtained over the last decade using the MARTINI model to describe ethylene-oxide containing compounds, an extensive assessment of the ability of such a model to describe the phase behavior of CiEj in water was carried out and results are presented here. Given the overall poor temperature transferability of the MARTINI model, mostly due to the lack of an accurate representation of hydrogen bonding, simulations were carried out at a single temperature of 333 K, where most phases are expected to occur according to experiments. Different chain lengths of both the hydrophobic and hydrophilic moieties, spanning a wide range of hydrophilic-lipophilic balance values, were investigated and the phase diagrams of various CiEj surfactants explored over a wide concentration range. The model was able to satisfactorily describe the effect of surfactant structure and concentration on mesophase formation. The stability and dimensions of the obtained phases, and the prediction of some unique features such as the characterization of a singular lamellar phase are presented. The results obtained in this work highlight both the predictive ability and the transferability of the MARTINI forcefield in the description of such systems. Moreover, the model was shown to provide adequate descriptions of the micellar phase in terms of micelle dimensions, critical micelle concentration, and average aggregation number.
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Affiliation(s)
- Emanuel A Crespo
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-1933, Aveiro, Portugal.
| | - Lourdes F Vega
- Chemical Engineering Department and Research and Innovation Center on CO2 and H2 (RICH Center), Khalifa University of Science and Technology, P. O. Box 127788, Abu Dhabi, United Arab Emirates
| | - Germán Pérez-Sánchez
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-1933, Aveiro, Portugal.
| | - João A P Coutinho
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-1933, Aveiro, Portugal.
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19
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Kumar V, Sai GM, Verma R, Mitchell-Koch KR, Ray D, Aswal VK, Thareja P, Kuperkar K, Bahadur P. Tuning Cationic Micelle Properties with an Antioxidant Additive: A Molecular Perspective. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4611-4621. [PMID: 33843215 PMCID: PMC8895413 DOI: 10.1021/acs.langmuir.1c00290] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In this work, we characterize the micellization and morphology transition induced in aqueous cetyltrimethylammonium bromide (CTAB) solution by the addition of the antioxidant propyl gallate (PG) using tensiometry, rheology, and small-angle neutron scattering (SANS) techniques combined with the molecular dynamics (MD) simulation approach. The adsorption of CTAB at the air-water interface in the presence of varying [PG] revealed a progressive decrease in the critical micelle concentration (CMC), while the changes in different interfacial parameters indicated enhancement of the hydrophobicity induced by PG in the CTAB micellar system. The dynamic rheology behavior indicated an increase in the flow viscosity (η) as a function of [PG]. Moreover, the rheological components (storage modulus, G', and loss modulus, G″) depicted the viscoelastic features. SANS measurements depicted the existence of ellipsoidal micelles with varying sizes and aggregation number (Nagg) as a function of [PG] and temperature. Computational simulation performed using density functional theory (DFT) calculations and molecular dynamics (MD) provided an insight into the atomic composition of the examined system. The molecular electrostatic potential (MEP) analysis depicted a close proximity of CTAB, i.e., emphasized favorable interactions between the quaternary nitrogen of CTAB and the hydroxyl group of the PG monomer, further validated by the two-dimensional nuclear Overhauser enhancement spectroscopy (2D-NOESY), which showed the penetration of PG inside the CTAB micelles. In addition, various dynamic properties, viz., the radial distribution function (RDF), the radius of gyration (Rg), and solvent-accessible surface area (SASA), showed a significant microstructural evolution of the ellipsoidal micelles in the examined CTAB-PG system, where the changes in the micellar morphology with a more elongated hydrophobic chain and the increased Rg and SASA values indicated the notable intercalation of PG in the CTAB micelles.
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Affiliation(s)
- Vinod Kumar
- Department of Chemistry, Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat-395 007, Gujarat, INDIA
| | - Geetha M Sai
- Department of Chemical Engineering, Indian Institute of Technology (IIT), Gandhinagar 382 355, Gujarat, INDIA
| | - Rajni Verma
- Department of Chemistry, Wichita State University (WSU), Wichita, Kansas 67260-0051, USA
| | - Katie R. Mitchell-Koch
- Department of Chemistry, Wichita State University (WSU), Wichita, Kansas 67260-0051, USA
| | - Debes Ray
- Solid State Physics Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, INDIA
| | - Vinod Kumar Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, INDIA
| | - Prachi Thareja
- Department of Chemical Engineering, Indian Institute of Technology (IIT), Gandhinagar 382 355, Gujarat, INDIA
| | - Ketan Kuperkar
- Department of Chemistry, Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat-395 007, Gujarat, INDIA
| | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University (VNSGU), Udhana-Magdalla road, Surat 395 007, Gujarat, INDIA
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20
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Guruge AG, Warren DB, Benameur H, Pouton CW, Chalmers DK. Aqueous phase behavior of the PEO-containing non-ionic surfactant C 12E 6: A molecular dynamics simulation study. J Colloid Interface Sci 2021; 588:257-268. [PMID: 33388586 DOI: 10.1016/j.jcis.2020.12.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 12/09/2020] [Accepted: 12/10/2020] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS Non-ionic surfactants containing polyethylene oxide (PEO) chains are widely used in drug formulations, cosmetics, paints, textiles and detergents. High quality molecular dynamics models for PEO surfactants can give us detailed, atomic-scale information about the behavior of surfactant/water mixtures. SIMULATIONS We used two molecular dynamics force fields (FFs), 2016H66 and 53A6DBW, to model the simple non-ionic PEO surfactant, hexaoxyethylene dodecyl ether (C12E6). We investigated surfactant/water mixtures that span the phase diagram of starting from randomly distributed arrangements. In some cases, we also started with prebuilt, approximate models. The simulations results were compared with the experimentally observed phase behavior. FINDINGS Overall, this study shows that the spontaneous self-assembly of PEO non-ionic surfactants into different colloidal structures can be accurately modeled with MD simulations using the 2016H66 FF although transitions to well-formed hexagonal phase are slow. Of the two FFs investigated, the 2016H66 FF better reproduces the experimental phase behavior across all regions of the C12E6/water phase diagram.
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Affiliation(s)
- Amali G Guruge
- Medicinal Chemistry Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Dallas B Warren
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Hassan Benameur
- Oral Drug Delivery Innovation, Chemical Division, Lonza, Strasbourg, France
| | - Colin W Pouton
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - David K Chalmers
- Medicinal Chemistry Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia.
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21
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Sadeghi MS, Moghbeli MR, Goddard WA. Self‐assembly mechanism of PEG‐
b
‐PCL and PEG‐
b
‐PBO‐
b
‐PCL amphiphilic copolymer micelles in aqueous solution from coarse grain modeling. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20200864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Maryam S. Sadeghi
- Smart Polymers and Nanocomposites Research Group, School of Chemical Engineering Iran University of Science and Technology Tehran Iran
| | - Mohammad Reza Moghbeli
- Smart Polymers and Nanocomposites Research Group, School of Chemical Engineering Iran University of Science and Technology Tehran Iran
| | - William A. Goddard
- Materials and Process Simulation Center (MSC) California Institute of Technology Pasadena California USA
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22
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Ma J, Song X, Peng B, Zhao T, Luo J, Shi R, Zhao S, Liu H. Multiscale molecular dynamics simulation study of polyoxyethylated alcohols self-assembly in emulsion systems. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116252] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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23
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Ghermezcheshme H, Makki H, Mohseni M, Ebrahimi M. Hydrophilic dangling chain interfacial segregation in polyurethane networks at aqueous interfaces and its underlying mechanisms: molecular dynamics simulations. Phys Chem Chem Phys 2020; 22:26351-26363. [PMID: 33179637 DOI: 10.1039/d0cp04244g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Polymer networks with hydrophilic dangling chains are ideal candidates for many submerged applications, e.g., protein non-adhesive coatings with non-fouling behavior. The dangling chains segregate from the polymer network towards the water and form a brush-like structure at the interface. Several factors such as the polymer network structure, dangling chain length, and water/dangling chain interaction may all affect the interfacial performance of the polymer. Therefore, we employed a Martini based coarse-grained (CG) molecular dynamics (MD) simulation to elucidate the influences of the abovementioned parameters on dangling chain interfacial segregation. We built up several polyurethane (PU) networks based on poly(tetra methylene glycol) (PTMG), as a macrodiol, and methoxy poly(ethylene glycol) (mPEG), as a dangling chain, with varying molecular weights. We found out that the macrodiol/dangling chain length ratio considerably smaller than one impedes the migration of dangling chains towards the water interface, while the dangling chain hydrophilicity and length determine the polymer interfacial layer density/thickness. Then, we artificially changed the dangling chain affinity to water from an intermediate to a very attractive water/dangling chain interaction. We justified that a brush-like structure forms in two consecutive steps: first, a longitudinal, and then a lateral migration of dangling chains in water. The latter step results in a uniform interfacial layer over the polymer interface that mainly occurs in the case of the attractive water/dangling chain interaction.
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Affiliation(s)
- Hassan Ghermezcheshme
- Department of Polymer and Color Engineering, Amirkabir University of Technology, 424 Hafez Ave., Tehran, Iran.
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24
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Zhou J, Ranjith PG. Self-assembly and viscosity changes of binary surfactant solutions: A molecular dynamics study. J Colloid Interface Sci 2020; 585:250-257. [PMID: 33285463 DOI: 10.1016/j.jcis.2020.11.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 11/15/2022]
Abstract
HYPOTHESIS Structure and self-assembly of surfactants in the solution shows a fundamental influence on its viscosity. Through molecular simulations using Martini force field, synergistic effects in aggregation as well as the viscosity changes of a binary ionic surfactant system can be modelled. Simulations: Coarse-grained molecular dynamics simulations are performed to model the SDS/CAPB binary surfactant solution, and both equilibrium and non-equilibrium methods are used to calculate the viscosity of the equilibrated micellar systems. FINDINGS Our simulation results indicate that the new version of the Martini force field can provide more reasonable self-assembly of surfactant, both single and binary system. Synergistic effects in micelle formation for SDS/CAPB have been successfully reproduced, that is, the formation of cylindrical micelles or even wormlike micelles at a lower concentration when compared with the pure system. Meanwhile, both equilibrium and non-equilibrium methods provide quantitatively comparable viscosity for each system. For pure micellar system, the viscosity linearly increases with the total concentration. Nevertheless, our simulation fails to capture the viscosity enhancement of the solution in corresponding with the formation of rodlike or wormlike micelles, and a full parameter optimization of force field is still necessary.
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Affiliation(s)
- Jun Zhou
- Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia
| | - P G Ranjith
- Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia.
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25
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Gouveia JD, Pérez-Sánchez G, Santos SM, Carvalho AP, Gomes JR, Jorge M. Mesoscale model of the synthesis of periodic mesoporous benzene-silica. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Das S, Khabaz F, Nguyen Q, Bonnecaze RT. Molecular Dynamics Simulations of Aqueous Nonionic Surfactants on a Carbonate Surface. J Phys Chem B 2020; 124:8158-8166. [PMID: 32794772 DOI: 10.1021/acs.jpcb.0c03997] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interactions and structure of secondary alcohol ethoxylates with 15 and 40 ethoxylate units in water near a calcite surface are studied. It is found that water binds preferentially to the calcite surface. Prediction of the free-energy landscape for surfactant molecules shows that single-surfactant molecules do not adsorb because they cannot get close enough to the surface because of the water layer for attractive ethoxylate-calcite or dispersion interactions to be significant. Micelles can adsorb onto the surface even with the intervening water layer because of the integrative effect of the attractive interactions of all the surfactant molecules. Adsorption is found to increase because of the closer proximity of the micelles to the surface due to a weakened water layer at higher temperatures. The free-energy well and barrier values are used to estimate surface to bulk partition coefficients for different surfactants and temperatures, and qualitative agreement is found with experimental observations. The combined effect of surfactant-water and surfactant-solid interactions is found to be responsible for an increased adsorption for nonionic surfactants as the system approaches the cloud point.
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Affiliation(s)
- Soumik Das
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Fardin Khabaz
- Department of Polymer Engineering, The University of Akron, Akron, Ohio 44325-0301, United States.,Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-0301, United States
| | - Quoc Nguyen
- Hildebrand Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Roger T Bonnecaze
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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27
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28
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Improved coarse-grain model to unravel the phase behavior of 1-alkyl-3-methylimidazolium-based ionic liquids through molecular dynamics simulations. J Colloid Interface Sci 2020; 574:324-336. [DOI: 10.1016/j.jcis.2020.04.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 04/14/2020] [Accepted: 04/16/2020] [Indexed: 01/06/2023]
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29
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Carrer M, Škrbić T, Bore SL, Milano G, Cascella M, Giacometti A. Can Polarity-Inverted Surfactants Self-Assemble in Nonpolar Solvents? J Phys Chem B 2020; 124:6448-6458. [PMID: 32618191 PMCID: PMC8009519 DOI: 10.1021/acs.jpcb.0c04842] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
We investigate the
self-assembly process of a surfactant with inverted
polarity in water and cyclohexane using both all-atom and coarse-grained
hybrid particle-field molecular dynamics simulations. Unlike conventional
surfactants, the molecule under study, proposed in a recent experiment,
is formed by a rigid and compact hydrophobic adamantane moiety, and
a long and floppy triethylene glycol tail. In water, we report the
formation of stable inverted micelles with the adamantane heads grouping
together into a hydrophobic core and the tails forming hydrogen bonds
with water. By contrast, microsecond simulations do not provide evidence
of stable micelle formation in cyclohexane. Validating the computational
results by comparison with experimental diffusion constant and small-angle
X-ray scattering intensity, we show that at laboratory thermodynamic
conditions the mixture resides in the supercritical region of the
phase diagram, where aggregated and free surfactant states coexist
in solution. Our simulations also provide indications as to how to
escape this region to produce thermodynamically stable micellar aggregates.
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Affiliation(s)
- Manuel Carrer
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Tatjana Škrbić
- Department of Physics and Institute for Fundamental Science, University of Oregon, Eugene, Oregon 97403, United States.,Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia,Campus Scientifico, Edificio Alfa, via Torino 155, 30170 Venezia Mestre, Italy
| | - Sigbjørn Løland Bore
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Giuseppe Milano
- Department of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, 992-8510 Yamagata-ken, Japan.,Dipartimento di Chimica e Biologia, Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Michele Cascella
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Achille Giacometti
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia,Campus Scientifico, Edificio Alfa, via Torino 155, 30170 Venezia Mestre, Italy.,European Centre for Living Technology (ECLT) Ca' Bottacin, 3911 Dorsoduro, Calle Crosera, 30123 Venice, Italy
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30
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Conchuir BO, Gardner K, Jordan KE, Bray DJ, Anderson RL, Johnston MA, Swope WC, Harrison A, Sheehy DR, Peters TJ. Efficient Algorithm for the Topological Characterization of Worm-like and Branched Micelle Structures from Simulations. J Chem Theory Comput 2020; 16:4588-4598. [DOI: 10.1021/acs.jctc.0c00311] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
| | - Kirk Gardner
- Department of Computer Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Kirk E. Jordan
- IBM T. J. Watson Research, Cambridge, Massachusetts 02142, United States
| | - David J. Bray
- The Hartree Centre, STFC Daresbury Laboratory, Warrington WA4 4AD, U.K
| | | | | | - William C. Swope
- IBM Almaden Research Center, San Jose, California 95120, United States
| | - Alex Harrison
- IBM Research Europe, The Hartree Centre, Daresbury WA4 4AD, U.K
| | - Donald R. Sheehy
- Department of Computer Science, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Thomas J. Peters
- Department of Computer Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
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31
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Lavagnini E, Cook JL, Warren PB, Williamson MJ, Hunter CA. A Surface Site Interaction Point Method for Dissipative Particle Dynamics Parametrization: Application to Alkyl Ethoxylate Surfactant Self-Assembly. J Phys Chem B 2020; 124:5047-5055. [PMID: 32510951 PMCID: PMC7309324 DOI: 10.1021/acs.jpcb.0c01895] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
![]()
Dissipative
particle dynamics (DPD) is a coarse-grained approach
to the simulation of large supramolecular systems, but one limitation
has been that the parameters required to describe the noncovalent
interactions between beads are not readily accessible. A first-principles
computational method has been developed so that bead interaction parameters
can be calculated directly from ab initio gas-phase
molecular electrostatic potential surfaces of the molecular fragments
that represent the beads. A footprinting algorithm converts the molecular
electrostatic potential surfaces into a discrete set of surface site
interaction points (SSIPs), and these SSIPs are used in the SSIMPLE
(surface site interaction model for the properties of liquids at equilibrium)
algorithm to calculate the free energies of transfer of one bead into
a solution of any other bead. The bead transfer free energies are
then converted into the required DPD interaction parameters for all
pairwise combinations of different beads. The reliability of the parameters
was demonstrated using DPD simulations of a range of alkyl ethoxylate
surfactants. The simulations reproduce the experimentally determined
values of the critical micelle concentration and mean aggregation
number well for all 22 surfactants studied.
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Affiliation(s)
- Ennio Lavagnini
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Joanne L Cook
- Unilever R&D Port Sunlight, Quarry Road East, Bebington CH63 3JW, U.K
| | - Patrick B Warren
- Unilever R&D Port Sunlight, Quarry Road East, Bebington CH63 3JW, U.K.,The Hartree Centre, STFC Daresbury Laboratory, Warrington WA4 4AD, U.K
| | - Mark J Williamson
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Christopher A Hunter
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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32
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Abstract
:
Micellar chemistry is gaining considerable interest among organic chemists because these
reactions are carried out in environmentally benign solvents like water. Owing to the exhaustive use
of toxic solvents in carrying out the different chemical reactions, there is a pressing need for alternative
approaches either environmental friendly or having minimum impact on the environment. In this
article, we aim to discuss the various aspects of micellar chemistry viz-a-viz its role in guiding the
chemical reactions. Micelles help to drive various kinds of organic reactions including oxidations,
reductions, carbon-carbon bond formation, carbon-heteroatom bond formation, multi-component reactions,
Pd-coupling reaction, olefin metathesis reaction, Morita-Baylis-Hillman reaction, etc. in water.
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Affiliation(s)
- Bilal A. Bhat
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Sanatnagar, Srinagar 190005, India
| | - Bashir A. Shairgojray
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Sanatnagar, Srinagar 190005, India
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33
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de Souza RM, Ratochinski RH, Karttunen M, Dias LG. Self-Assembly of Phosphocholine Derivatives Using the ELBA Coarse-Grained Model: Micelles, Bicelles, and Reverse Micelles. J Chem Inf Model 2020; 60:522-536. [PMID: 31714768 DOI: 10.1021/acs.jcim.9b00790] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The ELBA coarse-grained force field was originally developed for lipids, and its water model is described as a single-site Lennard-Jones particle with electrostatics modeled by an embedded point-dipole, while other molecules in this force field have a three (or four)-to-one mapping scheme. Here, ELBA was applied to investigate the self-assembly processes of dodecyl-phosphocholine (DPC) micelle, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine/1,2-dihexaoyl-sn-glycero-3-phosphocholine (DPPC/DHPC) bicelles, and DPPC/cyclohexane/water reverse micelles through coarse-grained molecular dynamics (MD) simulations. New parameters were obtained using a simplex algorithm-based calibration procedure to determine the Lennard-Jones parameters for cyclohexane, dodecane, and cyclohexane-dodecane cross-interactions. Density, self-diffusion coefficient, surface tension, and mixture excess volume were found to be in fair agreement with experimental data. These new parameters were used in the simulations, and the obtained structures were analyzed for shape, size, volume, and surface area. Except for the shape of DPC micelles, all other properties match well with available experimental data and all-atom simulations. Remarkably, in agreement with experiments the rodlike shape of the DPPC reverse micelle is well described by ELBA, while all-atom data in the literature predicts a disclike shape. To further check the consistency of the force field in reproducing the correct shapes of reverse micelles, additional simulations were performed doubling the system size. Two distinct reverse micelles were obtained both presenting the rodlike shape and correct aggregation number.
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Affiliation(s)
- R M de Souza
- Department of Chemistry , The University of Western Ontario , London , Ontario , Canada N6A 3K7.,Departamento de Química, FFCLRP , Universidade de São Paulo , Avenida Bandeirantes 3900 , 14040-901 Ribeirão Preto , SP , Brazil.,The Center for Advanced Materials and Biomaterials Research , The University of Western Ontario , London , Ontario , Canada N6K 3K7
| | - R H Ratochinski
- Departamento de Química, FFCLRP , Universidade de São Paulo , Avenida Bandeirantes 3900 , 14040-901 Ribeirão Preto , SP , Brazil
| | - Mikko Karttunen
- Department of Chemistry , The University of Western Ontario , London , Ontario , Canada N6A 3K7.,The Center for Advanced Materials and Biomaterials Research , The University of Western Ontario , London , Ontario , Canada N6K 3K7.,Department of Applied Mathematics , The University of Western Ontario , London , Ontario , Canada N6A 5B7
| | - L G Dias
- Departamento de Química, FFCLRP , Universidade de São Paulo , Avenida Bandeirantes 3900 , 14040-901 Ribeirão Preto , SP , Brazil
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34
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Anogiannakis SD, Petris PC, Theodorou DN. Promising Route for the Development of a Computational Framework for Self-Assembly and Phase Behavior Prediction of Ionic Surfactants Using MARTINI. J Phys Chem B 2019; 124:556-567. [DOI: 10.1021/acs.jpcb.9b09915] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Stefanos D. Anogiannakis
- School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
| | - Panagiotis C. Petris
- School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
| | - Doros N. Theodorou
- School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
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35
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Larsson J, Sanchez-Fernandez A, Mahmoudi N, Barnsley LC, Wahlgren M, Nylander T, Ulvenlund S. Effect of the Anomeric Configuration on the Micellization of Hexadecylmaltoside Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13904-13914. [PMID: 31566987 DOI: 10.1021/acs.langmuir.9b01960] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The self-assembly of the two anomeric forms of n-hexadecyl-d-maltopyranoside (denoted α-C16G2 and β-C16G2) has been studied in dilute aqueous solution by means of surface tension measurements, scattering methods (dynamic light scattering, static light scattering, and small-angle X-ray and neutron scattering), and cryo-transmission electron microscopy at different surfactant concentrations and temperatures. Surface tension measurements demonstrate differences in the surfactant adsorption at the air-water interface, where α-C16G2 shows a lower CMC than β-C16G2. Similarly, micelle morphology was found to profoundly depend on anomerism. β-C16G2 preferentially forms very elongated micelles with large persistence lengths, whereas α-C16G2 assembles into smaller micelles for which the structure varies with concentration and temperature. The differences between the two surfactant anomers in terms of self-assembly can be attributed to the interaction between neighboring headgroups. Specifically, β-C16G2 allows for a closer packing in the palisade layer, hence reducing the micelle curvature and promoting the formation of more elongated micelles. Strong intermolecular headgroup interactions may also account for the observed rigidity of the micelles.
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Affiliation(s)
| | | | - Najet Mahmoudi
- ISIS Neutron and Muon Source, Science & Technology Facilities Council , Rutherford Appleton Laboratory , Chilton OX11 0QX , U.K
| | - Lester C Barnsley
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ) , Forschungszentrum Jülich GmbH , Lichtenbergstr. 1 , 85748 Garching , Germany
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36
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Talley Edwards A, Javidialesaadi A, Weigandt KM, Stan G, Eads CD. Structure and Dynamics of Spherical and Rodlike Alkyl Ethoxylate Surfactant Micelles Investigated Using NMR Relaxation and Atomistic Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13880-13892. [PMID: 31573205 PMCID: PMC10552554 DOI: 10.1021/acs.langmuir.9b01345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Predicting and controlling the properties of amphiphile aggregate mixtures require understanding the arrangements and dynamics of the constituent molecules. To explore these topics, we study molecular arrangements and dynamics in alkyl ethoxylate nonionic surfactant micelles by combining NMR relaxation measurements with large-scale atomistic molecular dynamics simulations. We calculate parameters that determine relaxation rates directly from simulated trajectories, without introducing specific functional forms to describe the dynamics. NMR relaxation rates, which depend on relative motions of interacting atom pairs, are influenced by wide distributions of dynamic time scales. We find that relative motions of neighboring atom pairs are rapid and liquidlike but are subject to structural constraints imposed by micelle morphology. Relative motions of distant atom pairs are slower than nearby atom pairs because changes in distances and angles are smaller when the moving atoms are further apart. Large numbers of atom pairs undergoing these slow relative motions contribute to predominantly negative cross-relaxation rates. For spherical micelles, but not for cylindrical micelles, cross-relaxation rates are positive only for surfactant tail atoms connected to the hydrophilic headgroup. This effect is related to the lower packing density of these atoms at the hydrophilic-hydrophobic boundary in spherical vs cylindrical arrangements, with correspondingly rapid and less constrained motion of atoms at the boundary.
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Affiliation(s)
- Allison Talley Edwards
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
- Corporate Research & Development, The Procter & Gamble Company, Mason, Ohio 45040, United States
| | | | - Katie M. Weigandt
- National Institute of Standards and Technology, 100 Bureau Drive, MS 6102, Gaithersburg, Maryland 20899, United States
| | - George Stan
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Charles D. Eads
- Corporate Research & Development, The Procter & Gamble Company, Mason, Ohio 45040, United States
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37
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Mysona JA, McCormick AV, Morse DC. Simulation of diblock copolymer surfactants. I. Micelle free energies. Phys Rev E 2019; 100:012602. [PMID: 31499857 DOI: 10.1103/physreve.100.012602] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Indexed: 06/10/2023]
Abstract
Semigrand hybrid Monte Carlo simulations are used to measure equilibrium properties of micelles formed in a simple bead-spring model of asymmetric A-B diblock copolymer surfactant molecules in an A homopolymer solvent, over a range of values of surfactant solubility. Simulations are used to accurately measure the free energy of formation of micellar clusters as a function of aggregation number over a wide range of values, and to characterize the crossover from spherical to rodlike micelle shape with increasing aggregation number. Dynamical properties of the same model are considered in an accompanying paper [Phys. Rev. E 100, 012603 (2019)10.1103/PhysRevE.100.012603].
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Affiliation(s)
- Joshua A Mysona
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, USA
| | - Alon V McCormick
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, USA
| | - David C Morse
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, USA
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38
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Mysona JA, McCormick AV, Morse DC. Simulation of diblock copolymer surfactants. II. Micelle kinetics. Phys Rev E 2019; 100:012603. [PMID: 31499829 DOI: 10.1103/physreve.100.012603] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Indexed: 06/10/2023]
Abstract
Molecular dynamics (MD) simulations are used to measure dynamical properties of a simple bead-spring model of A-B diblock copolymer molecules, and to characterize rates and mechanisms of several dynamical processes. Dynamical properties are analyzed within the context of a kinetic population model that allows for both stepwise insertion and expulsion of individual free molecules and occasional fission and fusion of micelles. Kinetic coefficients for stepwise processes and micelle fission have been extracted from MD simulations of individual micelles. Insertion of a free surfactant molecule into a preexisting micelle is shown to be a completely diffusion-controlled process for the model studied here. Estimates are given for rates of rare events that create and destroy entire micelles by competing mechanisms involving stepwise association and dissociation or fission and fusion. Both mechanisms are shown to be relevant over the range of parameters studied here, with association and dissociation dominating in systems with more soluble surfactants and fission and fusion dominating in systems with less soluble surfactants.
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Affiliation(s)
- Joshua A Mysona
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, USA
| | - Alon V McCormick
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, USA
| | - David C Morse
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, USA
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39
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Raschke S, Heuer A. Non-equilibrium effects of micelle formation as studied by a minimum particle-based model. J Chem Phys 2019; 150:204903. [DOI: 10.1063/1.5086618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- Simon Raschke
- Westfälische Wilhelms-Universität Münster, Institut für Physikalische Chemie, Corrensstraße 28/30, 48149 Münster, Germany
| | - Andreas Heuer
- Westfälische Wilhelms-Universität Münster, Institut für Physikalische Chemie, Corrensstraße 28/30, 48149 Münster, Germany
- Center for Multiscale Theory and Computation (CMTC), Corrensstr. 40, D-48149 Münster, Germany
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40
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Brega V, Scaletti F, Zhang X, Wang LS, Li P, Xu Q, Rotello VM, Thomas SW. Polymer Amphiphiles for Photoregulated Anticancer Drug Delivery. ACS APPLIED MATERIALS & INTERFACES 2019; 11:2814-2820. [PMID: 30582802 PMCID: PMC6623983 DOI: 10.1021/acsami.8b18099] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
We report the synthesis of amphiphilic polymers featuring lipophilic stearyl chains and hydrophilic poly(ethylene glycol) polymers that are connected through singlet oxygen-cleavable alkoxyanthracene linkers. These amphiphilic polymers assembled in water to form micelles with diameters of ∼20 nm. Reaction of the alkoxyanthracene linkers with light and O2 cleaved the ether C-O bonds, resulting in formation of the corresponding 9,10-anthraquinone derivatives and concomitant disruption of the micelles. These micelles were loaded with the chemotherapeutic agent doxorubicin, which was efficiently released upon photo-oxidation. The drug-loaded reactive micelles were effective at killing cancer cells in vitro upon irradiation at 365 nm, functioning through both doxorubicin release and photodynamic mechanisms.
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Affiliation(s)
- Valentina Brega
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford MA 02155, United States
| | - Federica Scaletti
- Department of Chemistry, University of Massachusetts Amherst, 710 Nt. Pleasant Street, Amherst MA 01003, United States
| | - Xianzhi Zhang
- Department of Chemistry, University of Massachusetts Amherst, 710 Nt. Pleasant Street, Amherst MA 01003, United States
| | - Li-Sheng Wang
- Department of Chemistry, University of Massachusetts Amherst, 710 Nt. Pleasant Street, Amherst MA 01003, United States
| | - Prudence Li
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford MA 02155, United States
| | - Qiaobing Xu
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford MA 02155, United States
| | - Vincent M. Rotello
- Department of Chemistry, University of Massachusetts Amherst, 710 Nt. Pleasant Street, Amherst MA 01003, United States
| | - Samuel W. Thomas
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford MA 02155, United States
- Corresponding Author: (S.W.T.)
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41
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Saini A, Saha A, Viñas C, Teixidor F. The key to controlling the morphologies of quantum nanocrystals: spherical carborane ligands. Chem Commun (Camb) 2019; 55:9817-9820. [DOI: 10.1039/c9cc03941d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carboranyl ligands with different functional moieties have been used to obtain different morphologies in the quantum regime using a colloidal route.
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Affiliation(s)
- Abhishek Saini
- Institut de Ciencia de Materials de Barcelona
- Bellaterra
- Spain
| | - Arpita Saha
- Institut de Ciencia de Materials de Barcelona
- Bellaterra
- Spain
| | - Clara Viñas
- Institut de Ciencia de Materials de Barcelona
- Bellaterra
- Spain
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42
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Custer GS, Xu H, Matysiak S, Das P. How Hydrophobic Hydration Destabilizes Surfactant Micelles at Low Temperature: A Coarse-Grained Simulation Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12590-12599. [PMID: 30247911 DOI: 10.1021/acs.langmuir.8b01994] [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
Micelles are self-assembled aggregates of amphiphilic surfactant molecules that are important in a variety of applications, including drug delivery, detergency, and catalysis. It is known that the micellization process is driven by the same physiochemical forces that drive protein folding, aggregation, and biological membrane self-assembly. Nevertheless, the molecular details of how micelle stability changes in water at low temperature are not fully clear. We develop and use a coarse-grained model to investigate how the interplay between nonionic surfactants and the surrounding water at the nanoscale affects the stability of micelles at high and low temperatures. Simulations of preformed C12E5 micelles in explicit water at a range of temperatures reveal the existence of two distinct surfactant conformations within the micelle, a bent structure and an extended structure, the latter being more prevalent at low temperature. Favorable interactions of the surfactant with more ordered solvation water stabilizes the extended configuration, allowing nanoscale wetting of the dry, hydrophobic core of the micelle, leading to the micelle breaking. Taken together, our coarse-grained simulations unravel how energetic and structural changes of the surfactant and the surrounding water destabilize micelles at low temperature, which is a direct consequence of the weakened hydrophobicity. Our approach thus provides an effective mean for extracting the molecular-level changes during hydrophobicity-driven destabilization of molecular self-assembly, which is important in a wide range of fields, including biology, polymer science, and nanotechnology.
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Affiliation(s)
| | | | | | - Payel Das
- IBM Thomas J. Watson Research Center , Yorktown Heights, New York 10598 , United States
- Department of Applied Physics and Applied Mathematics , Columbia University , New York 10027 , United States
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43
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Zhao L, Tu Y, Fang H, Hamley IW, Wang Z. Self-Assembled Micellar Structures of Lipopeptides with Variable Number of Attached Lipid Chains Revealed by Atomistic Molecular Dynamics Simulations. J Phys Chem B 2018; 122:9605-9615. [PMID: 30253107 DOI: 10.1021/acs.jpcb.8b07877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We present atomistic molecular dynamics simulation study of the self-assembly behavior of toll-like agonist lipopeptides (Pam nCSK4) in aqueous solutions. The variable number of hexadecyl lipid chains ( n = 1, 2, 3) per molecule has been experimentally suggested to have remarkable influence on their self-assembled nanostructures. Starting from preassembled spherical or bilayer configurations, the aggregates of lipopeptides, PamCSK4 and Pam2CSK4, which contain peptide sequences CSK4 linked to either mono- or dilipid chains (Pam), evolve into spherical-like micelles within 30 ns, whereas the self-assembled structure of trilipidated lipopeptides, Pam3CSK4, relaxes much slower and reaches an equilibrium state of flattened wormlike micelle with a bilayer packing structure. The geometric shapes and sizes, namely the gyration radii of spherical micelles and thickness of the flattened wormlike micelle, are found to be in good agreement with experimental measurements, which effectively validates the simulation models and employed force fields. Detailed analyses of molecular packing reveal that these self-assembled nanostructures all consist of a hydrophobic core constructed of lipid chains, a transitional layer, and a hydrophilic interfacial layer composed of peptide sequences. The average area per peptide head at the interfaces is found to be nearly constant for all micellar structures studied. The packing parameter of the lipopeptide molecules thus increases with the increase of the number of linked lipid chains, giving rise to the distinct micellar shape transition from spherical-like to flattened wormlike geometry with bilayer stacking, which is qualitatively different from the shape transitions of surfactant micelles induced by variation of concentration or salt type. To facilitate the close-packing of the lipid chains in the hydrophobic core, the lipopeptide molecules typically take the bent conformation with average tilt angles between the peptide sequences and the lipid chains ranging from 110° to 140°. This consequently affects the orientation angles of the lipid chains with respect to the radial or normal direction of the spherical-like or flattened wormlike micelles. In addition, the secondary structures of the peptides may also be altered by the number of lipid chains to which they are linked and the resultant micellar structures. Our simulation results on the microscopic structural features of the lipopeptide nanostructures may provide potential insights into their bioactivities and contribute to the design of bioactive medicines or drug carriers. The force fields built for these lipopeptides and the geometric packing discussions could also be adopted for simulating and understanding the self-assembly behavior of other bioactive amiphiphiles with similar chemical compositions.
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Affiliation(s)
- Liang Zhao
- College of Physical Science and Technology , Yangzhou University , Yangzhou , Jiangsu 225009 , China
| | - Yusong Tu
- College of Physical Science and Technology , Yangzhou University , Yangzhou , Jiangsu 225009 , China
| | - Haiping Fang
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
| | - Ian W Hamley
- Department of Chemistry , University of Reading , Whiteknights, Reading RG6 6AD , United Kingdom
| | - Zuowei Wang
- School of Mathematical, Physical and Computational Sciences , University of Reading , Whiteknights, Reading RG6 6AX , United Kingdom
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44
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Qu G, Guan Q, Sun H, Lin M, Cai Y, Pan Y, Li J, Niu R. Molecular dynamics study of salt effects on micellization of N-dodecyl-N,N-dimethyl-3-ammonio-1-propane-sulfonate. J DISPER SCI TECHNOL 2018. [DOI: 10.1080/01932691.2017.1385485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Guangmiao Qu
- School of Chemical Engineering and Materials Science, Nanjing Polytechnic Institute, Nanjing, Jiangsu Province, China
- Provincial Key Laboratory of Oil & Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, Heilongjiang Province, China
| | - Qi Guan
- School of Chemical Engineering and Materials Science, Nanjing Polytechnic Institute, Nanjing, Jiangsu Province, China
| | - Haiyan Sun
- School of Chemical Engineering and Materials Science, Nanjing Polytechnic Institute, Nanjing, Jiangsu Province, China
| | - Musen Lin
- School of Chemical Engineering and Materials Science, Nanjing Polytechnic Institute, Nanjing, Jiangsu Province, China
| | - Yuan Cai
- School of Chemical Engineering and Materials Science, Nanjing Polytechnic Institute, Nanjing, Jiangsu Province, China
| | - Yong Pan
- School of Chemical Engineering and Materials Science, Nanjing Polytechnic Institute, Nanjing, Jiangsu Province, China
| | - Jie Li
- Provincial Key Laboratory of Oil & Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, Heilongjiang Province, China
| | - Ruixia Niu
- Provincial Key Laboratory of Oil & Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, Heilongjiang Province, China
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45
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Kolli HB, de Nicola A, Bore SL, Schäfer K, Diezemann G, Gauss J, Kawakatsu T, Lu ZY, Zhu YL, Milano G, Cascella M. Hybrid Particle-Field Molecular Dynamics Simulations of Charged Amphiphiles in an Aqueous Environment. J Chem Theory Comput 2018; 14:4928-4937. [DOI: 10.1021/acs.jctc.8b00466] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hima Bindu Kolli
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O.
Box 1033, Blindern, 0315 Oslo, Norway
| | - Antonio de Nicola
- Department of Organic Materials Science, Yamagata University, 4-3-16 Jonan Yonezawa, Yamagata-ken 992-8510, Japan
| | - Sigbjørn Løland Bore
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O.
Box 1033, Blindern, 0315 Oslo, Norway
| | - Ken Schäfer
- Institut für
Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Gregor Diezemann
- Institut für
Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Jürgen Gauss
- Institut für
Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Toshihiro Kawakatsu
- Department of Physics, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Zhong-Yuan Lu
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - You-Liang Zhu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Giuseppe Milano
- Department of Organic Materials Science, Yamagata University, 4-3-16 Jonan Yonezawa, Yamagata-ken 992-8510, Japan
| | - Michele Cascella
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O.
Box 1033, Blindern, 0315 Oslo, Norway
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46
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Grunewald F, Rossi G, de Vries AH, Marrink SJ, Monticelli L. Transferable MARTINI Model of Poly(ethylene Oxide). J Phys Chem B 2018; 122:7436-7449. [PMID: 29966087 DOI: 10.1021/acs.jpcb.8b04760] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Motivated by the deficiencies of the previous MARTINI models of poly(ethylene oxide) (PEO), we present a new model featuring a high degree of transferability. The model is parametrized on (a) a set of 8 free energies of transfer of dimethoxyethane (PEO dimer) from water to solvents of varying polarity; (b) the radius of gyration in water at high dilution; and (c) matching angle and dihedral distributions from atomistic simulations. We demonstrate that our model behaves well in five different areas of application: (1) it produces accurate densities and phase behavior or small PEO oligomers and water mixtures; (2) it yields chain dimensions in good agreement with the experiment in three different solvents (water, diglyme, and benzene) over a broad range of molecular weights (∼1.2 kg/mol to 21 kg/mol); (3) it reproduces qualitatively the structural features of lipid bilayers containing PEGylated lipids in the brush and mushroom regime; (4) it is able to reproduce the phase behavior of several PEO-based nonionic surfactants in water; and (5) it can be combined with the existing MARTINI PS to model PS-PEO block copolymers. Overall, the new PEO model outperforms previous models and features a high degree of transferability.
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Affiliation(s)
- Fabian Grunewald
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials , University of Groningen , Groningen , The Netherlands
| | - Giulia Rossi
- Physics Department , University of Genoa , via Dodecaneso 33 , 16146 Genoa , Italy
| | - Alex H de Vries
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials , University of Groningen , Groningen , The Netherlands
| | - Siewert J Marrink
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials , University of Groningen , Groningen , The Netherlands
| | - Luca Monticelli
- Molecular Microbiology and Structural Biochemistry, UMR 5086 , CNRS and University of Lyon , Lyon , France
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47
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Wang L, Haghmoradi A, Liu J, Xi S, Hirasaki GJ, Miller CA, Chapman WG. Modeling micelle formation and interfacial properties with iSAFT classical density functional theory. J Chem Phys 2018; 146:124705. [PMID: 28388160 DOI: 10.1063/1.4978503] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Surfactants reduce the interfacial tension between phases, making them an important additive in a number of industrial and commercial applications from enhanced oil recovery to personal care products (e.g., shampoo and detergents). To help obtain a better understanding of the dependence of surfactantproperties on molecular structure, a classical density functional theory, also known as interfacial statistical associating fluid theory, has been applied to study the effects of surfactant architecture on micelle formation and interfacial properties for model nonionic surfactant/water/oil systems. In this approach, hydrogen bonding is explicitly included. To minimize the free energy, the system minimizes interactions between hydrophobic components and hydrophilic components with water molecules hydrating the surfactant head group. The theory predicts micellar structure, effects of surfactant architecture on critical micelle concentration, aggregation number, and interfacial tension isotherm of surfactant/water systems in qualitative agreement with experimental data. Furthermore, this model is applied to study swollen micelles and reverse swollen micelles that are necessary to understand the formation of a middle-phase microemulsion.
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Affiliation(s)
- Le Wang
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
| | - Amin Haghmoradi
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
| | - Jinlu Liu
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
| | - Shun Xi
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
| | - George J Hirasaki
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
| | - Clarence A Miller
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
| | - Walter G Chapman
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005, USA
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48
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Herrera MG, Pizzuto M, Lonez C, Rott K, Hütten A, Sewald N, Ruysschaert JM, Dodero VI. Large supramolecular structures of 33-mer gliadin peptide activate toll-like receptors in macrophages. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2018; 14:1417-1427. [DOI: 10.1016/j.nano.2018.04.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 03/23/2018] [Accepted: 04/16/2018] [Indexed: 02/08/2023]
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49
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Moths B, Witten TA. Engineering single-polymer micelle shape using nonuniform spontaneous surface curvature. Phys Rev E 2018; 97:032505. [PMID: 29776184 DOI: 10.1103/physreve.97.032505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Indexed: 11/07/2022]
Abstract
Conventional micelles, composed of simple amphiphiles, exhibit only a few standard morphologies, each characterized by its mean surface curvature set by the amphiphiles. Here we demonstrate a rational design scheme to construct micelles of more general shape from polymeric amphiphiles. We replace the many amphiphiles of a conventional micelle by a single flexible, linear, block copolymer chain containing two incompatible species arranged in multiple alternating segments. With suitable segment lengths, the chain exhibits a condensed spherical configuration in solution, similar to conventional micelles. Our design scheme posits that further shapes are attained by altering the segment lengths. As a first study of the power of this scheme, we demonstrate the capacity to produce long-lived micelles of horseshoe form using conventional bead-spring simulations in two dimensions. Modest changes in the segment lengths produce smooth changes in the micelle's shape and stability.
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Affiliation(s)
- Brian Moths
- Department of Physics and James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T A Witten
- Department of Physics and James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA
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50
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Vuorte M, Määttä J, Sammalkorpi M. Simulations Study of Single-Component and Mixed n-Alkyl-PEG Micelles. J Phys Chem B 2018; 122:4851-4860. [PMID: 29664641 PMCID: PMC6150674 DOI: 10.1021/acs.jpcb.8b00398] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/26/2018] [Indexed: 11/29/2022]
Abstract
Here, we study one-component and mixed n-alkyl-poly(ethylene glycol) (C mE n) micelles with varying poly(ethylene glycol) (PEG) chain lengths n using coarse-grained molecular simulations. These nonionic alkyl-PEG surfactants and their aggregates are widely used in bio and chemical technology. As expected, the simulations show that increasing the PEG chain length decreases the alkyl-PEG micelle core diameter and the aggregation number but also enhances PEG chain penetration to the core region and spreads the micelle corona. Both the core and corona density are heavily dependent on the PEG chain length and decrease with increasing PEG length. Furthermore, we find that the alkyl-PEG surfactants exhibit two distinct micellization modes: surfactants with short PEG chains as their hydrophilic heads aggregate with the PEG heads relatively extended. Their aggregation number and the PEG corona density are dictated by the core carbon density. For longer PEG chains, the PEG sterics, that is, the volume occupied by the PEG head group, becomes the critical factor limiting the aggregation. Finally, simulations of binary mixtures of alkyl-PEGs of two different PEG chain lengths show that even in the absence of core-freezing, the surfactants prefer the aggregate size of their single-component solutions with the segregation propelled via enthalpic contributions. The findings, especially as they provide a handle on the density and the density profile of the aggregates, raise attention to effective packing shape as a design factor of micellar systems, for example, drug transport, solubilization, or partitioning.
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Affiliation(s)
- Maisa Vuorte
- Department of Chemistry and Materials
Science, School of Chemical Engineering, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
| | - Jukka Määttä
- Department of Chemistry and Materials
Science, School of Chemical Engineering, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
| | - Maria Sammalkorpi
- Department of Chemistry and Materials
Science, School of Chemical Engineering, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
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