PMID- 31421457
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20190911
LR  - 20190911
IS  - 1873-3727 (Electronic)
IS  - 0001-8686 (Linking)
VI  - 272
DP  - 2019 Oct
TI  - Surface anchoring of nematic liquid crystal on swollen polymer brush studied by 
      surface forces measurement.
PG  - 101997
LID - S0001-8686(19)30114-9 [pii]
LID - 10.1016/j.cis.2019.101997 [doi]
AB  - Surface anchoring plays a fundamental role in controlling the molecular alignment 
      of a bulk liquid crystal (LC). It has been previously shown that the pretilt 
      angle of a nematic liquid crystal (NLC) can be controlled by changing the 
      grafting density of a liquid crystalline polymer, 
      poly(6-(4-methoxy-azobenzene-4'-oxy) hexyl methacrylate) (PMMAZO). In this study, 
      the thickness of the swollen PMMAZO brush was measured by employing the surface 
      forces apparatus (SFA). NLC 4-cyano-4'-pentylbiphenyl (5CB) and toluene were used 
      as the solvents. It was shown that both 5CB and toluene were good solvents for 
      PMMAZO. The repulsive force in 5CB appeared at D(0) = 98.2 +/- 4.6 nm for high 
      grafting density (HD) surfaces, and at 32.1 +/- 4.5 nm for the low grafting density 
      (LD) surfaces. These results indicated that the PMMAZO molecules extended nearly 
      perpendicular to the HD surfaces, while they laid on the substrate for the LD 
      surfaces. The interaction between 5CB and the mesogenic group of PMMAZO was 
      stronger than that for toluene. These results could support the expected surface 
      anchoring mechanism of 5CB by the PMMAZO brush.
CI  - Copyright (c) 2019 Elsevier B.V. All rights reserved.
FAU - Yanagimachi, Takuya
AU  - Yanagimachi T
AD  - Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 
      60637, USA; Advanced Institute for Materials Research (AIMR), Tohoku University, 
      Sendai, Miyagi 980-8577, Japan; Industry Creation Hatchery Center (NICHe), Tohoku 
      University, Sendai, Miyagi 980-8577, Japan.
FAU - Li, Xiao
AU  - Li X
AD  - Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 
      60637, USA; Center for Molecular Engineering, Argonne National Laboratory, 
      Lemont, IL 60439, USA.
FAU - Nealey, Paul F
AU  - Nealey PF
AD  - Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 
      60637, USA; Center for Molecular Engineering, Argonne National Laboratory, 
      Lemont, IL 60439, USA. Electronic address: nealey@uchicago.edu.
FAU - Kurihara, Kazue
AU  - Kurihara K
AD  - Industry Creation Hatchery Center (NICHe), Tohoku University, Sendai, Miyagi 
      980-8577, Japan; Institute of Multidisciplinary Research for Advanced Materials 
      (IMRAM), Tohoku University, Sendai, Miyagi 980-8577, Japan. Electronic address: 
      kurihara@tagen.tohoku.ac.jp.
LA  - eng
PT  - Letter
DEP - 20190731
PL  - Netherlands
TA  - Adv Colloid Interface Sci
JT  - Advances in colloid and interface science
JID - 8706645
SB  - IM
OTO - NOTNLM
OT  - 5CB
OT  - FECO
OT  - Liquid crystalline polymer brush
OT  - Surface anchoring
OT  - Surface forces measurement
OT  - Toluene
EDAT- 2019/08/20 06:00
MHDA- 2019/08/20 06:01
CRDT- 2019/08/18 06:00
PHST- 2019/03/29 00:00 [received]
PHST- 2019/07/08 00:00 [revised]
PHST- 2019/07/30 00:00 [accepted]
PHST- 2019/08/20 06:00 [pubmed]
PHST- 2019/08/20 06:01 [medline]
PHST- 2019/08/18 06:00 [entrez]
AID - S0001-8686(19)30114-9 [pii]
AID - 10.1016/j.cis.2019.101997 [doi]
PST - ppublish
SO  - Adv Colloid Interface Sci. 2019 Oct;272:101997. doi: 10.1016/j.cis.2019.101997. 
      Epub 2019 Jul 31.