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Ballal D, Asthagiri D, Parambathu AV, Venkataraman P, Fouad WA, Cox KR, Chapman WG. Erratum: “Isolating the non-polar contributions to the intermolecular potential for water-alkane interactions” [J. Chem. Phys. 141, 064905 (2014)]. J Chem Phys 2016. [DOI: 10.1063/1.4962733] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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52
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Bansal A, Asthagiri D, Cox KR, Chapman WG. Structure and thermodynamics of a mixture of patchy and spherical colloids: A multi-body association theory with complete reference fluid information. J Chem Phys 2016; 145:074904. [DOI: 10.1063/1.4960985] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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53
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Haghmoradi A, Wang L, Chapman WG. A new equation of state for associating Lennard–Jones fluids with two sites: small bond angle. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1197430] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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54
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Haghmoradi A, Wang L, Chapman WG. A density functional theory for colloids with two multiple bonding associating sites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:244009. [PMID: 27115237 DOI: 10.1088/0953-8984/28/24/244009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Wertheim's multi-density formalism is extended for patchy colloidal fluids with two multiple bonding patches. The theory is developed as a density functional theory to predict the properties of an associating inhomogeneous fluid. The equation of state developed for this fluid depends on the size of the patch, and includes formation of cyclic, branched and linear clusters of associated species. The theory predicts the density profile and the fractions of colloids in different bonding states versus the distance from one wall as a function of bulk density and temperature. The predictions from our theory are compared with previous results for a confined fluid with four single bonding association sites. Also, comparison between the present theory and Monte Carlo simulation indicates a good agreement.
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Saeger AR, Johnson JK, Chapman WG, Henderson D. Cavity correlation and bridge functions at high density and near the critical point: a test of second-order Percus–Yevick theory. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1177662] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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56
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Asthagiri D, Ballal D, Venkataraman P, Fouad WA, Cox KR, Chapman WG. Response to “Comment on ‘Isolating the non-polar contributions to the intermolecular potential for water-alkane interactions”’ [J. Chem. Phys. 144, 137101 (2016)]. J Chem Phys 2016; 144:137102. [DOI: 10.1063/1.4944979] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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57
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Fouad WA, Wang L, Haghmoradi A, Asthagiri D, Chapman WG. Understanding the Thermodynamics of Hydrogen Bonding in Alcohol-Containing Mixtures: Cross-Association. J Phys Chem B 2016; 120:3388-402. [DOI: 10.1021/acs.jpcb.5b12375] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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58
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Fouad WA, Wang L, Haghmoradi A, Gupta SK, Chapman WG. Understanding the Thermodynamics of Hydrogen Bonding in Alcohol-Containing Mixtures: Self Association. J Phys Chem B 2015; 119:14086-101. [DOI: 10.1021/acs.jpcb.5b08285] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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59
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Fouad WA, Song KY, Chapman WG. Experimental Measurements and Molecular Modeling of the Hydrate Equilibrium as a Function of Water Content for Pressures up to 40 MPa. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02240] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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60
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Fouad WA, Yarrison M, Song KY, Cox KR, Chapman WG. High pressure measurements and molecular modeling of the water content of acid gas containing mixtures. AIChE J 2015. [DOI: 10.1002/aic.14885] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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61
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Ballal D, Chapman WG. Competition between Intra- and Intermolecular Association of Chain Molecules with Water-like Solvent. J Phys Chem B 2015; 119:6792-802. [PMID: 25955880 DOI: 10.1021/acs.jpcb.5b00766] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluid properties and phase behavior of systems such as glycol ethers, carboxylic acids, and proteins are affected by the competition between intra- and intermolecular hydrogen bonding. Here we study this competition by extending Wertheim's first-order thermodynamic perturbation theory to include intramolecular hydrogen bonding in chain molecules in the presence of an explicit water-like solvent. The theory derived here is found to be in good agreement with molecular simulation. It is shown that intramolecular association is most important for shorter chains at low temperature, low density, and high chain concentration. The theory is also extended into a density functional theory formalism to study the effect of intramolecular association on the structuring of the different segments of the molecules close to a hydrophobic surface. Intramolecular association is found to be enhanced close to the surface, with the total density of the system having the most effect on structuring close to the surface.
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Ballal D, Venkataraman P, Fouad WA, Cox KR, Chapman WG. Isolating the non-polar contributions to the intermolecular potential for water-alkane interactions. J Chem Phys 2014; 141:064905. [DOI: 10.1063/1.4892341] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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63
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Marshall BD, Chapman WG. Thermodynamic perturbation theory for self-assembling mixtures of divalent single patch colloids. SOFT MATTER 2014; 10:5168-5176. [PMID: 24910981 DOI: 10.1039/c4sm00586d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work we extend Wertheim's thermodynamic perturbation theory (TPT) to binary mixtures (species A and species B) of patchy colloids were each species has a single patch which can bond a maximum of twice (divalent). Colloids are treated as hard spheres with a directional conical association site. We restrict the system such that only patches between unlike species share attractions; meaning there are AB attractions but no AA or BB attractions. The theory is derived in Wertheim's two density formalism for one site associating fluids. Since the patches are doubly bondable, associated chains, of all chain lengths, as well as 4-mer rings consisting of two species A and two species B colloids are accounted for. With the restriction of only AB attractions, triatomic rings of doubly bonded colloids, which dominate in the corresponding pure component case, cannot form. The theory is shown to be in good agreement with Monte Carlo simulation data for the structure and thermodynamics of these patchy colloid mixtures as a function of temperature, density, patch size and composition. It is shown that 4-mer rings dominate at low temperature, inhibiting the polymerization of the mixture into long chains. Mixtures of this type have been recently synthesized by researchers. This work provides the first theory capable of accurately modeling these mixtures.
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64
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Tavakkoli M, Taghikhani V, Pishvaie MR, Masihi M, Panuganti SR, Chapman WG. Investigation of Oil–Asphaltene Slurry Rheological Behavior. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.834421] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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65
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Marshall BD, Haghmoradi A, Chapman WG. Resummed thermodynamic perturbation theory for bond cooperativity in associating fluids with small bond angles: Effects of steric hindrance and ring formation. J Chem Phys 2014; 140:164101. [DOI: 10.1063/1.4871307] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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66
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Agrawal A, Yun T, Pesek SL, Chapman WG, Verduzco R. Shape-responsive liquid crystal elastomer bilayers. SOFT MATTER 2014; 10:1411-5. [PMID: 24651367 DOI: 10.1039/c3sm51654g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Monodomain liquid crystal elastomers (LCEs) are shape-responsive materials, but shape changes are typically limited to simple uniaxial extensions or contractions. Here, we demonstrate that complex surface patterns and shape changes, including patterned wrinkles, helical twisting, and reversible folding, can be achieved in LCE-polystyrene (PS) bilayers. LCE-PS bilayer shape changes are achieved in response to simple temperature changes and can be controlled through various material parameters including overall aspect ratio and LCE and polystyrene film thicknesses. Deposition of a patterned PS film on top of an LCE enables the preparation of an elastomer that reversibly twists and a folding leaf-like elastomer, which opens and closes in response to temperature changes. The phenomena are captured through finite element simulations, in quantitative agreement with experiments.
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Marshall BD, Chapman WG. Resummed thermodynamic perturbation theory for bond cooperativity in associating fluids. J Chem Phys 2013; 139:214106. [DOI: 10.1063/1.4834637] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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68
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Marshall BD, Chapman WG, Telo da Gama MM. Classical density functional theory for associating fluids in orienting external fields. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:060301. [PMID: 24483368 DOI: 10.1103/physreve.88.060301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2013] [Indexed: 06/03/2023]
Abstract
We develop a classical density functional theory (DFT) for two-site associating fluids in spatially homogeneous external fields which exhibit orientational inhomogeneities. The Helmholtz free-energy functional is obtained using Wertheim's thermodynamic perturbation theory and the orientational distribution function is obtained using DFT in the canonical ensemble. It is shown that an orientating field significantly enhances association by ordering the molecules, thereby reducing the entropic penalty of association. It is also shown that association enhances the orientational order for fixed field strength.
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Agrawal A, Chipara AC, Shamoo Y, Patra PK, Carey BJ, Ajayan PM, Chapman WG, Verduzco R. Dynamic self-stiffening in liquid crystal elastomers. Nat Commun 2013; 4:1739. [PMID: 23612280 PMCID: PMC3648875 DOI: 10.1038/ncomms2772] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Accepted: 03/19/2013] [Indexed: 11/25/2022] Open
Abstract
Biological tissues have the remarkable ability to remodel and repair in response to disease, injury, and mechanical stresses. Synthetic materials lack the complexity of biological tissues, and man-made materials which respond to external stresses through a permanent increase in stiffness are uncommon. Here, we report that polydomain nematic liquid crystal elastomers increase in stiffness by up to 90% when subjected to a low-amplitude (5%), repetitive (dynamic) compression. Elastomer stiffening is influenced by liquid crystal content, the presence of a nematic liquid crystal phase and the use of a dynamic as opposed to static deformation. Through rheological and X-ray diffraction measurements, stiffening can be attributed to a nematic director which rotates in response to dynamic compression. Stiffening under dynamic compression has not been previously observed in liquid crystal elastomers and may be useful for the development of self-healing materials or for the development of biocompatible, adaptive materials for tissue replacement.
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70
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Ballal D, Chapman WG. Hydrophobic and hydrophilic interactions in aqueous mixtures of alcohols at a hydrophobic surface. J Chem Phys 2013; 139:114706. [DOI: 10.1063/1.4821604] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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71
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Marshall BD, Chapman WG. Molecular theory for self assembling mixtures of patchy colloids and colloids with spherically symmetric attractions: The single patch case. J Chem Phys 2013; 139:104904. [DOI: 10.1063/1.4820417] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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72
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Gong K, Marshall BD, Chapman WG. Modeling lower critical solution temperature behavior of associating polymer brushes with classical density functional theory. J Chem Phys 2013; 139:094904. [DOI: 10.1063/1.4819957] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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73
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Marshall BD, Chapman WG. Erratum: “Molecular theory for the phase equilibria and cluster distribution of associating fluids with small bond angles” [J. Chem. Phys. 139, 054902 (2013)]. J Chem Phys 2013. [DOI: 10.1063/1.4819262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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74
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Marshall BD, Chapman WG. Molecular theory for the phase equilibria and cluster distribution of associating fluids with small bond angles. J Chem Phys 2013; 139:054902. [DOI: 10.1063/1.4816665] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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75
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Panuganti SR, Vargas FM, Chapman WG. Property Scaling Relations for Nonpolar Hydrocarbons. Ind Eng Chem Res 2013. [DOI: 10.1021/ie303012n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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