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You XM, Vlasov AY, Anton L, Masters AJ. Isotropic and nematic phases of the hard spheroid fluid: a virial approach. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:061706. [PMID: 23005113 DOI: 10.1103/physreve.85.061706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Indexed: 06/01/2023]
Abstract
We use a high level virial expansion to investigate the properties of the isotropic and nematic phases of the hard spheroid fluid. We use the Monte Carlo techniques described previously to calculate the virial coefficients up to seventh order and we represent the dependence of these coefficients on particle orientations via a spherical harmonic expansion. The expansion coefficients are determined using Lebedev quadrature which carries out the angular integration required exactly. For fairly spherical spheroids (1/3<a/b<3, where a and b are the semiaxes of the spheroid) the virial expansion appears to be convergent in both the isotropic and nematic phases up to high density. For more aspherical particles, the predictions varied in a more erratic fashion upon increasing the number of virials. The use of a finite angular basis set to represent the orientationally dependent virial coefficients could be a contributory cause to this.
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Affiliation(s)
- X-M You
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, United Kingdom
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Tarazona P, Cuesta J, Martínez-Ratón Y. Density Functional Theories of Hard Particle Systems. THEORY AND SIMULATION OF HARD-SPHERE FLUIDS AND RELATED SYSTEMS 2008. [DOI: 10.1007/978-3-540-78767-9_7] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Franco-Melgar M, Haslam AJ, Jackson G. A generalisation of the Onsager trial-function approach: describing nematic liquid crystals with an algebraic equation of state. Mol Phys 2008. [DOI: 10.1080/00268970801926958] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Affiliation(s)
- Udai P. Singh
- a Department of Chemistry , Boston College , Chestnut Hill , Massachusetts , 02167 , U.S.A
- b Department of Physics , Raja Harpal Singh Degree College , Singramau , Jaunpur , 222175 , India
| | - Udayan Mohanty
- a Department of Chemistry , Boston College , Chestnut Hill , Massachusetts , 02167 , U.S.A
| | - Suresh K. Sinha
- c Department of Physics , L. S. College, Bihar University , Muzaffarpur , 842001 , India
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Allen MP, Evans GT, Frenkel D, Mulder BM. Hard Convex Body Fluids. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141458.ch1] [Citation(s) in RCA: 174] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Chick LA, Viney C. Transitions to Ordered Phases in Systems Containing Rodlike Particles: I. A New Continuum Monte Carlo Approach. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259308028789] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Christopher Viney
- b Center for Bioengineering, University of Washington , Seattle , WA , 98195
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Murat M, Kantor Y. Elasticity of a system with noncentral potentials. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:031124. [PMID: 17025611 DOI: 10.1103/physreve.74.031124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2006] [Indexed: 05/12/2023]
Abstract
We derive expressions for determination of the stress and the elastic constants in systems composed of particles interacting via noncentral two-body potentials as thermal averages of products of first and second partial derivatives of the interparticle potentials and components of the interparticle separation vectors. These results are adapted to hard potentials, where the stress and the elastic constants are expressed as thermal averages of the components of normals to contact surfaces between the particles and components of vectors separating their centers. The averages require knowledge of the simultaneous contact probabilities of two pairs of particles. We apply the expressions to particles for which a contact function can be defined, and demonstrate the feasibility of the method by computing the stress and the elastic constants of a two-dimensional system of hard ellipses using Monte Carlo simulations.
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Affiliation(s)
- Michael Murat
- School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
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Hołyst R, Poniewierski A. Comparative study of the nematic phase-isotropic phase transition in systems of uniaxial hard cores. Mol Phys 2006. [DOI: 10.1080/00268978900102211] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- R. Hołyst
- a Institute of Physical Chemistry of the Polish Academy of Sciences , Kasprzaaka 44/52, 01-224 , Warsaw , Poland
| | - A. Poniewierski
- a Institute of Physical Chemistry of the Polish Academy of Sciences , Kasprzaaka 44/52, 01-224 , Warsaw , Poland
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Jose PP, Bagchi B. In search of temporal power laws in the orientational relaxation near isotropic–nematic phase transition in model nematogens. J Chem Phys 2004; 120:11256-66. [PMID: 15268154 DOI: 10.1063/1.1742942] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recent Kerr relaxation experiments by Gottke et al. have revealed the existence of a pronounced temporal power law decay in the orientational relaxation near the isotropic-nematic phase transition (INPT) of nematogens of rather small aspect ratio, kappa (kappa approximately 3-4). We have carried out very long (50 ns) molecular dynamics simulations of model (Gay-Berne) prolate ellipsoids with aspect ratio 3 in order to investigate the origin of this power law. The model chosen is known to undergo an isotropic to nematic phase transition for a range of density and temperature. The distance dependence of the calculated angular pair correlation function correctly shows the emergence of a long range correlation as the INPT is approached along the density axis. In the vicinity of INPT, the single particle second rank orientational time correlation function exhibits power law decay, (t(-alpha)) with exponent alpha approximately 2/3. More importantly, we find the sudden appearance of a pronounced power-law decay in the collective part of the second rank orientational time correlation function at short times when the density is very close to the transition density. The power law has an exponent close to unity, that is, the correlation function decays almost linearly with time. At long times, the decay is exponential-like, as predicted by Landau-de Gennes mean field theory. Since Kerr relaxation experiments measure the time derivative of the collective second rank orientational pair correlation function, the simulations recover the near independence of the signal on time observed in experiments. In order to capture the microscopic essence of the dynamics of pseudonematic domains inside the isotropic phase, we introduce and calculate a dynamic orientational pair correlation function (DOPCF) obtained from the coefficients in the expansion of the distinct part of orientational van Hove time correlation function in terms of spherical harmonics. The DOPCF exhibits power law relaxation when the pair separation length is below certain critical length. The orientational relaxation of a local director, defined in terms of the sum of unit vectors of all the ellipsoidal molecules, is also found to show slow power law relaxation over a long time scale. These results have been interpreted in terms of a newly developed mode coupling theory of orientational dynamics near the INPT. In the present case, the difference between the single particle and the collective orientational relaxation is huge which can be explained by the frequency dependence of the memory kernel, calculated from the mode coupling theory. The relationship of this power law with the one observed in a supercooled liquid near its glass transition temperature is explored.
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Affiliation(s)
- Prasanth P Jose
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
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de Miguel E, Martín del Río E. The isotropic–nematic transition in hard Gaussian overlap fluids. J Chem Phys 2001. [DOI: 10.1063/1.1411991] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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McGrother SC, Williamson DC, Jackson G. A re‐examination of the phase diagram of hard spherocylinders. J Chem Phys 1996. [DOI: 10.1063/1.471343] [Citation(s) in RCA: 307] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Regan MJ, Bienenstock A. Phase separation in sputtered amorphous metal-germanium alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12170-12186. [PMID: 9977986 DOI: 10.1103/physrevb.51.12170] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xu H. A density functional study of nematic-smectic A-solid transitions of parallel hard spherocylinders. Mol Phys 1992. [DOI: 10.1080/00268979200102461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Cuesta JA, Tejero CF, Baus M. Isotropic-nematic transition of D-dimensional hard convex bodies within the effective-liquid approach. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:7395-7412. [PMID: 9906812 DOI: 10.1103/physreva.45.7395] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Ferreira PG, Perera A, Moreau M, Telo da Gama MM. The hard ellipse liquid: An integral equation study. J Chem Phys 1991. [DOI: 10.1063/1.461385] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Cuesta JA, Tejero CF, Xu H, Baus M. Effective-liquid approach to the generalized Onsager theories of the isotropic-nematic transition of hard convex bodies. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:5306-5309. [PMID: 9906584 DOI: 10.1103/physreva.44.5306] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Ram J, Singh Y. Density-functional theory of the nematic phase: Results for a system of hard ellipsoids of revolution. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:3718-3731. [PMID: 9906389 DOI: 10.1103/physreva.44.3718] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lo W, Pelcovits RA. Nonlocal elasticity theory of polymeric liquid crystals. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:4756-4763. [PMID: 9904584 DOI: 10.1103/physreva.42.4756] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Tjipto‐Margo B, Evans GT. The Onsager theory of the isotropic–nematic liquid crystal transition: Incorporation of the higher virial coefficients. J Chem Phys 1990. [DOI: 10.1063/1.458758] [Citation(s) in RCA: 92] [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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Cuesta JA, Frenkel D. Monte Carlo simulation of two-dimensional hard ellipses. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:2126-2136. [PMID: 9904261 DOI: 10.1103/physreva.42.2126] [Citation(s) in RCA: 91] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Singer SJ, Mumaugh R. Monte Carlo study of fluid–plastic crystal coexistence in hard dumbbells. J Chem Phys 1990. [DOI: 10.1063/1.459139] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Poniewierski A, Holyst R. Density-functional theory for systems of hard rods. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 41:6871-6880. [PMID: 9903102 DOI: 10.1103/physreva.41.6871] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Somoza AM, Tarazona P. Density functional approximation for hard‐body liquid crystals. J Chem Phys 1989. [DOI: 10.1063/1.457487] [Citation(s) in RCA: 103] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Cuesta JA, Tejero CF, Baus M. Isotropic-nematic transition of hard ellipses. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:6498-6506. [PMID: 9901252 DOI: 10.1103/physreva.39.6498] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Singh Y, Singh UP. Density-functional theory of the flexoelectric effect in nematic liquids. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:4254-4262. [PMID: 9901756 DOI: 10.1103/physreva.39.4254] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Marko JF. First-order phase transitions in the hard-ellipsoid fluid from variationally optimized direct pair correlations. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:2050-2062. [PMID: 9901458 DOI: 10.1103/physreva.39.2050] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Marko JF. Exact pair correlations in a one-dimensional fluid of hard cores with orientational and translational degrees of freedom. PHYSICAL REVIEW LETTERS 1989; 62:543-546. [PMID: 10040262 DOI: 10.1103/physrevlett.62.543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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McMullen WE. Molecular theory of the isotropic-nematic interface: Hard spherocylinders. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:6384-6395. [PMID: 9900398 DOI: 10.1103/physreva.38.6384] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Perera A, Patey GN, Weis JJ. Density functional theory applied to the isotropic–nematic transition in model liquid crystals. J Chem Phys 1988. [DOI: 10.1063/1.455319] [Citation(s) in RCA: 76] [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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Lee S. The Onsager‐type theory for nematic ordering of finite‐length hard ellipsoids. J Chem Phys 1988. [DOI: 10.1063/1.455332] [Citation(s) in RCA: 135] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Singh UP, Mohanty U, Singh Y. Molecular theory for freezing transition of hard ellipsoid and hard dumbbell molecules. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:4377-4380. [PMID: 9900900 DOI: 10.1103/physreva.38.4377] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Colot JL, Wu XG, Xu H, Baus M. Density-functional, Landau, and Onsager theories of the isotropic-nematic transition of hard ellipsoids. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:2022-2036. [PMID: 9900602 DOI: 10.1103/physreva.38.2022] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Mahato MC, Lakshmi MR, Pandit R, Krishnamurthy HR. Liquid-mesophase-solid transitions: Systematics of a density-wave theory. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:1049-1064. [PMID: 9900468 DOI: 10.1103/physreva.38.1049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Smithline SJ, Rick SW, Haymet ADJ. Density functional theory of freezing for molecular liquids. J Chem Phys 1988. [DOI: 10.1063/1.454074] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Marko JF. Accurate calculation of isotropic-plastic and isotropic-nematic transitions in the hard-ellipsoid fluid. PHYSICAL REVIEW LETTERS 1988; 60:325-328. [PMID: 10038513 DOI: 10.1103/physrevlett.60.325] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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McMullen WE, Oxtoby DW. Erratum: A density functional approach to freezing transitions in molecular fluids: Dipolar hard spheres [J. Chem. Phys. 86, 4146 (1987)]. J Chem Phys 1988. [DOI: 10.1063/1.454776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Baus M, Colot JL, Wu XG, Xu H. Finite-density Onsager-type theory for the isotropic-nematic transition of hard ellipsoids. PHYSICAL REVIEW LETTERS 1987; 59:2184-2187. [PMID: 10035446 DOI: 10.1103/physrevlett.59.2184] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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McMullen WE, Oxtoby DW. A density functional approach to freezing transitions in molecular fluids: Dipolar hard spheres. J Chem Phys 1987. [DOI: 10.1063/1.451925] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Singh K, Singh Y. Density-functional theory of curvature elasticity in nematic liquids. II. Effect of long-range dispersion interactions. PHYSICAL REVIEW. A, GENERAL PHYSICS 1986; 34:548-561. [PMID: 9897282 DOI: 10.1103/physreva.34.548] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Singh Y, Singh K. Density-functional theory of curvature elasticity in nematic liquids. I. PHYSICAL REVIEW. A, GENERAL PHYSICS 1986; 33:3481-3492. [PMID: 9897060 DOI: 10.1103/physreva.33.3481] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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