TITLE

Microscopic theory of anchoring transitions at the surfaces of pure liquid crystals and their mixtures. II. The effect of surface adsorption

AUTHOR(S)
Teixeira, P. I. C.; Sluckin, T. J.
PUB. DATE
July 1992
SOURCE
Journal of Chemical Physics;7/15/1992, Vol. 97 Issue 2, p1510
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have extended our theory of anchoring transitions to take into account adsorption at the interface between a nematic–non-nematic binary mixture and a solid aligning substrate. This was achieved by decoupling adsorption and anchoring and treating the former in the context of the Cahn theory of wetting, while the latter was studied using our previous anchoring theory. For ease of calculation, we mapped the relevant portion of the phase diagram of the mixture onto that of a (isotropic) regular solution. The anchoring angle has been calculated over the whole concentration range, in the partial wetting regime, and in the near saturation region, in the complete wetting regime. For realistic values of the molecular parameters, anchoring transitions have been found which exhibit a degree of temperature independence (‘universality’) akin to that observed experimentally. Ways of developing a fully consistent theory of anchoring transitions are also briefly discussed.
ACCESSION #
7639622

 

Related Articles

  • Electrochirally controlled bistable surface switching in nematic liquid crystals. Barberi, R.; Durand, G. // Applied Physics Letters;6/24/1991, Vol. 58 Issue 25, p2907 

    Presents an electrically controlled bistable surface switching for nematic liquid crystals in cells with the usual display geometry. Control of the surface bistability by means of an electrochiral effect; Doping of a nematic with chiral ions.

  • The role of adsorbed alkali metal atoms in the enhancement of surface reactivity: A scanning.... Gorelik, D.; Aloni, S. // Journal of Chemical Physics;6/15/1998, Vol. 108 Issue 23, p9877 

    Examines the nature of the initial adsorption state of potassium (K) on silicon surface. Use of atomically resolved surface photovoltage imaging and tunneling barrier imaging with a scanning microscope; Growth of K islands; Function of K islands; Enhancement of chemical reactivity upon K...

  • Characterization of the cylindrical cavities of Anopore and Nuclepore membranes. Crawford, G. P.; Steele, L. M.; Ondris-Crawford, R.; Iannacchione, G. S.; Yeager, C. J.; Doane, J. W.; Finotello, D. // Journal of Chemical Physics;5/15/1992, Vol. 96 Issue 10, p7788 

    The microscopic properties of the inner surface of the cavities of Anopore and Nuclepore membranes are investigated with scanning electron microscopy (SEM), nitrogen adsorption isotherms, and deuterium nuclear magnetic resonance (2H-NMR). Useful information about the cavity orientation and...

  • Adsorption of 3-pyrroline on Si(100) from first principles. Romero, Aldo H.; Sbraccia, Carlo; Silvestrelli, Pier Luigi // Journal of Chemical Physics;5/22/2004, Vol. 120 Issue 20, p9745 

    The chemisorption of 3-pyrroline (C4H7N) on Si(100) is studied from first principles. Three different structures can be realized for which, depending on the temperature, the chemisorption process is facile (for two of them it is essentially barrierless); among these configurations the most...

  • A new approach for patterning epiclon-based polyimide precursor films using a lyotropic liquid crystal template. Cosutchi, Andreea; Hulubei, Camelia; Stoica, Iuliana; Ioan, Silvia // Journal of Polymer Research;Nov2011, Vol. 18 Issue 6, p2389 

    Blends of hydroxypropyl cellulose (HPC) in lyotropic phase have been prepared with a new epiclon-based poly(amic acid) (PAA) in different ratios. The detailed surface morphology of the PAA/HPC films was examined by polarized light microscopy (PLM) and atomic force microscopy (AFM). Besides the...

  • Spontaneous radial liquid crystals alignment on curved polymeric surfaces. De Sio, Luciano; Tabiryan, Nelson; Bunning, Timothy // Applied Physics Letters;6/2/2014, Vol. 104 Issue 22, p1 

    We report on the fabrication and characterization of curved periodic microstructures formed through the controlled phase separation of a liquid crystal and a polymerizing matrix comprising self-aligned liquid crystal. Imaging through a "Fresnel like" structure imparts an intensity profile onto a...

  • Dissociation mechanism of 2-propanol on a Si(111)-(7×7) surface studied by scanning tunneling microscopy. Tanaka, Ken-ichi; Nomoto, Yuka; Xie, Zhao-Xiong // Journal of Chemical Physics;3/1/2004, Vol. 120 Issue 9, p4486 

    Adsorption of 2-propanol, (CH[sub 3])[sub 2]CHOH, on a Si(111)-7×7 surface was studied by scanning tunneling microscopy. (CH[sub 3])[sub 2]CHOH adsorbs equally on the faulted and unfaulted half unit cells by forming Si–OCH(CH[sub 3])[sub 2] and Si–H on an adatom and rest atom...

  • Initial stage of the adsorption of fluorofullerene molecules on Si surface. Oreshkin, A.; Bakhtizin, R.; Murugan, P.; Kumar, V.; Fukui, N.; Hashizume, T.; Sakurai, T. // JETP Letters;Dec2010, Vol. 92 Issue 7, p449 

    Spatially resolved images of an individual CF fluorofullerene molecule on Si(100) − 2 × 1 surface have been obtained using scanning tunneling microscopy. Scanning tunneling microscopy results and ab initio calculations show that the fluorofullerene molecules interact with the Si(100)...

  • Maleic anhydride adsorption on silicon (001). Miotto, R.; Ferraz, A. C.; Srivastava, G. P. // Journal of Chemical Physics;8/15/2005, Vol. 123 Issue 7, p074709 

    The adsorption of maleic anhydride on the Si(001) surface has been investigated using the first-principles pseudopotential formalism. Our total-energy calculations suggest that maleic anhydride (C2H2–C2O3) adsorbs preferentially through a [2+2] cycloaddition of the C==C bond ([2+2]) with...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics