Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.167801
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Funding
- Korean Research Foundation [KRF-2007-357-C00034]
- U. S. DOE Office of Basic Energy Science [DE-FG02-01ER45934]
- Office of Naval Research [N00014-05-0404]
- National Science Foundation [DMR-0804111]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0804111] Funding Source: National Science Foundation
- National Research Foundation of Korea [2007-357-C00034] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The spatial and temperature dependence of the surface-induced orientational order parameter S(z,T) was determined in the isotropic phase. An optical fiber was immersed in a thin liquid crystal layer and the retardation was measured as a function of the fiber's height above the surface, from which the model-independent S(z,T) was deduced with resolution less than or similar to 2 nm. It was found that (i) S(z=0)less than or similar to 0.12 close to the nematic transition temperature, (ii) the susceptibility is mean-field-like, and (iii) S(z,T) deviates significantly from exponential spatial decay. The results are discussed in terms of a nonlocal potential.
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