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  • 1
    Electronic Resource
    Electronic Resource
    Nucleation in liquid crystals and liquid crystal polymers (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2168-2171 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A nematic mixture that undergoes a first-order phase transition to an ordered state is considered. The dynamics of the phase separation in terms of a theory based on a time-dependent Landau–Ginzburg equation is described. The laws of growth and dissolution for isotropic and anisotropic droplets are discussed. An example is given for a bidisperse and a polydisperse (liquid crystal polymer) sample. The possibility of spinodal decomposition in these systems is also explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459888
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  • 2
    Electronic Resource
    Electronic Resource
    Theory of growth rate of nucleating droplets (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1796-1800 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The growth law for spherical droplets during a first order phase transition is derived and shown to fulfill a variational procedure. This permits the use of simple trial functions for the interfacial profiles in calculating the critical radius, the growth rate, and the surface tension. Results agree with previous theories for conserved and nonconserved order parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465296
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  • 3
    Electronic Resource
    Electronic Resource
    Conformational properties for linear nematic and cholesteric polymers in the bend elastic chain model (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1708-1715 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The chain conformation of a liquid crystal polymer will be modified at the isotropic–anisotropic phase transition. Numerical results for the end-to-end distance 〈R2〉 and the radius of gyration 〈S2〉 of the polymer are presented using the bend elastic chain to model the polymer and including anisotropic mean field interactions. Anisotropy of conformation is calculated in nematics in the direction of preferred orientation as given by the component 〈R2z〉. In cholesterics, anisotropy occurs perpendicular to the director as well and 〈R2x〉≠〈R2y〉. The conformation is studied as a function of temperature, degree of polymerization, and persistence length. In cholesterics, a modification of the conformation is also found at those values of parameters (temperature, molecular weight) for which the pitch diverges and changes sign.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466598
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of chain length and degree of substitution on the cholesteric pitch: theoretical considerations (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 3812-3814 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00040a031
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  • 5
    Electronic Resource
    Electronic Resource
    Rigid diffusion paths in droplet growth (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 12250-12255 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theory for growth of a single droplet of the new stable phase during a first-order phase transition is developed. In the early stage, growth occurs through particle diffusion inhibited by the surface pressure of the spherical droplet. As the droplet grows, the surface curvature diminishes and a transition to rapid propagation of the concentration front occurs. Results are given for the initial and asymptotic droplet distribution function and for the single droplet growth law. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479163
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  • 6
    Electronic Resource
    Electronic Resource
    Elastic constants of semirigid liquid–crystal polymers (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6556-6559 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Frank elastic constants of a polymer liquid crystal are calculated. The effects of chain flexibility and screened orientational interactions are considered. A quadratic dependence in the chain length is shown to occur under certain conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452398
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  • 7
    Electronic Resource
    Electronic Resource
    Induced orientational order in liquid layers (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 2228-2231 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A density functional approach has been used to study the effect of an orientation dependent substrate potential on a simple fluid of linear particles with weak anisotropy. Within a model potential, it can be shown that orientational order can be induced within the range of the substrate interaction near the freezing temperature. This is superimposed on the usual density variation at the surface and can cause an unusual negative temperature variation of the surface tension. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475603
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  • 8
    Electronic Resource
    Electronic Resource
    Screening in semirigid polymer systems (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 899-903 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An expression for screening of the effective monomer interactions in semirigid polymer systems is developed. Anisotropic interactions dependent on monomer orientation are taken into account in an expansion of the bare potential in spherical harmonics. Using the method of Gaussian random fields previously applied to simple flexible polymers, the equation for the screened potential is given as an expansion in the density correlation functions of the effective chain. The effect of the polymer interactions on the persistence length and end-to-end distance of worm-like chains is calculated and shown to be small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449505
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  • 9
    Electronic Resource
    Electronic Resource
    Persistent diffusion in nanopores (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 4982-4988 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Brownian dynamics are used to relate the time dependent concentration of particles constrained in a pore to the observed flux and to study the flow induced by wall effects. The joint probability for a particle is calculated, not only to be at a certain position but with a given velocity as well. The persistence of the velocity direction and the resulting coupling between position and velocity alter the particle dynamics. In constrained geometries, transport though the pore is enhanced. With time, an average particle velocity flow field is set up along with the initial slow evolution by diffusion. For reflecting boundary conditions on the wall, the increase of the density along the walls causes particles to flow toward the center of the pore. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1338478
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  • 10
    Electronic Resource
    Electronic Resource
    Mesomorphic polymer solutions (1986)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 7 (1986), S. 587-587 
    Details
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450498
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