TY - JOUR
T1 - Evidence for the zigzag model of the smectic-C phase in the liquid crystal 4-butoxyphenylester 4-decyloxybenzoic acid (4OP10OB)
T2 - A high-resolution x-ray study
AU - Keller, Edward N.
AU - Nachaliel, Ehud
AU - Davidov, Dan
AU - Böffel, Christine
PY - 1986
Y1 - 1986
N2 - We report, for the first time to our knowledge, on high-resolution x-ray scattering measurements of the liquid crystal 4-butoxyphenylester 4-decyloxybenzoic acid (4OP10OB) with emphasis on the smectic-C phase and the smectic-A to smectic-C phase transition. From angular scans in reciprocal space we found that the smectic-C layer planes undergo a continuous tilt p with respect to temperature that can be described either by a Landau-type mean-field theory (which includes a sixth-order term in p) or by a simple scaling form: p[(Tc-T)/Tc]0.44, where Tc is the smectic-Asmectic-C transition temperature. Simultaneous measurements of the lattice spacing in the smectic-C phase suggest that the molecules do not behave like rigid rods. We found that the diamagnetic part of the molecule strongly couples to the magnetic field and tilts independently of the aliphatic end chains. The end chains are melted and thus maintain an almost-temperature-independent contact angle to the layer planes. Our measurements are consistent with the zigzag model of Bartolino, Doucet, and Durand.
AB - We report, for the first time to our knowledge, on high-resolution x-ray scattering measurements of the liquid crystal 4-butoxyphenylester 4-decyloxybenzoic acid (4OP10OB) with emphasis on the smectic-C phase and the smectic-A to smectic-C phase transition. From angular scans in reciprocal space we found that the smectic-C layer planes undergo a continuous tilt p with respect to temperature that can be described either by a Landau-type mean-field theory (which includes a sixth-order term in p) or by a simple scaling form: p[(Tc-T)/Tc]0.44, where Tc is the smectic-Asmectic-C transition temperature. Simultaneous measurements of the lattice spacing in the smectic-C phase suggest that the molecules do not behave like rigid rods. We found that the diamagnetic part of the molecule strongly couples to the magnetic field and tilts independently of the aliphatic end chains. The end chains are melted and thus maintain an almost-temperature-independent contact angle to the layer planes. Our measurements are consistent with the zigzag model of Bartolino, Doucet, and Durand.
UR - http://www.scopus.com/inward/record.url?scp=0000630658&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.34.4363
DO - 10.1103/PhysRevA.34.4363
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0000630658
SN - 1050-2947
VL - 34
SP - 4363
EP - 4369
JO - Physical Review A
JF - Physical Review A
IS - 5
ER -