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Surface anchoring stabilized high strength disclinations in smectic C phase of a schiff‐base liquid crystal
Author(s) -
Zhang QiZhen,
Cui Li,
Yin XiaoYing
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040220932
Subject(s) - liquid crystal , chemistry , differential scanning calorimetry , schiff base , disclination , crystallography , phase (matter) , anchoring , molecule , hydrogen bond , optical microscope , substrate (aquarium) , scanning electron microscope , optics , materials science , organic chemistry , composite material , physics , oceanography , structural engineering , geology , thermodynamics , engineering
The observation of disclination cores of high strength S= −2, −3, −4, −5, −6, −7, −8 in a smectic C phase of Schiff‐base type liquid crystal (LC) is reported. The results of polarizing optical microscope (POM), differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD) prove that the sample exhibits smectic C phase. It is suggested that the formation of the high strength disclination is mainly ascribed to the stronger anchoring of LC molecules on the substrate due to the formation of hydrogen bonds between the pendent hydroxyl of the LC molecule and the substrate.