Measurement of the azimuthal anchoring energy of liquid crystals in contact with oligo(ethylene glycol)-terminated self-assembled monolayers supported on obliquely deposited gold films

Langmuir : the ACS Journal of Surfaces and Colloids
Brian H ClareNicholas L Abbott

Abstract

We report measurements of the orientations and azimuthal anchoring energies of the nematic liquid crystal 4-cyano-4'-pentylbiphenyl (5CB) on polycrystalline gold films that are deposited from a vapor at an oblique angle of incidence and subsequently decorated with organized monolayers of oligomers of ethylene glycol. Whereas the gold films covered with monolayers presenting tetra(ethylene glycol) (EG4) lead to orientations of 5CB that are perpendicular to the plane of incidence of the gold, monolayers presenting tri(ethylene glycol) (EG3) direct 5CB to orient parallel to the plane of incidence of the gold during deposition of the gold film. We also measure the azimuthal anchoring energy of the 5CB to be smaller on the surfaces presenting EG3 (3.2 +/- 0.8 microJ/m2) as compared to EG4 (5.5 +/- 0.9 microJ/m2). These measurements, when combined with other results presented in this paper, are consistent with a physical model in which the orientation and anchoring energies of LCs on these surfaces are influenced by both (i) short-range interactions of 5CB with organized oligomers of ethylene glycol at these surfaces and (ii) long-range interactions of 5CB with the nanometer-scale topography of the obliquely deposited films. For surf...Continue Reading

References

Nov 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·V K Gupta, N L Abbott
Mar 5, 2002·Nature Biotechnology·Benjamin T HousemanMilan Mrksich
Jun 6, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·L T ThieghiD T Balogh
Jul 13, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Shinichiro OkaTadashi Akahane
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Luis A Tercero EspinozaNicholas L Abbott
Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Brian H Clare, Nicholas L Abbott

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Citations

Apr 2, 2010·ACS Applied Materials & Interfaces·Aaron M LoweNicholas L Abbott
May 9, 2012·Chemistry of Materials : a Publication of the American Chemical Society·Aaron M Lowe, Nicholas L Abbott
Nov 19, 2011·Journal of the American Chemical Society·Yiqun Bai, Nicholas L Abbott
Nov 26, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Yiqun Bai, Nicholas L Abbott
Jun 29, 2011·The Analyst·Vera Joanne Aliño, Kun-Lin Yang
Oct 21, 2014·Physical Chemistry Chemical Physics : PCCP·Takao IshidaMasa-aki Haga
Jan 26, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Daniel S MillerNicholas L Abbott
Sep 26, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Paul D I FletcherVesselin N Paunov
Apr 20, 2016·Journal of the American Chemical Society·Jeffrey J SchwartzPaul S Weiss
Nov 20, 2009·The Journal of Physical Chemistry. B·Kevin CritchleyStephen D Evans
Dec 11, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Siok Lian LaiKun-Lin Yang
Aug 23, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Brian H ClareNicholas L Abbott

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