Atomic force microscopy study of surface topography of films of cholesteric oligomer- and polymer-based mixtures with photovariable helix pitch

被引：19

作者：

Bobrovsky, Alexey ^{[1
]}

Sinitsyna, Olga ^{[1
]}

Abramchuk, Sergei ^{[1
]}

Yaminsky, Igor ^{[1
]}

Shibaev, Valery ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119991, Russia

来源：

PHYSICAL REVIEW E | 2013年 / 87卷 / 01期

关键词：

LIQUID-CRYSTALLINE POLYMERS; COPOLYMERS; PHASE; PHOTOISOMERIZATION; NANOPARTICLES; SYSTEMS; LAYERS; COLOR;

D O I：

10.1103/PhysRevE.87.012503

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The surface topography of glass-forming polymers and oligomer cholesteric systems with a phototunable helix pitch was studied. For this purpose several mixtures based on nematic polyacrylate and cholesteric cyclosiloxanes doped with chiral-photochromic dopant were prepared and investigated. The molecules of chiral-photochromic dopant consist of isosorbide chiral moiety and cinnamic C=C double bonds capable of E-Z photoisomerizing. UV irradiation of the planarly oriented films of mixtures leads to dopant photoisomerization and changes of its helical twisting power. During this process irreversible changes of helix pitch values take place, which allows one to obtain the same cholesteric systems with different helix pitch values. The films of the annealed mixtures were studied by atomic force microscopy and transmission electron microscopy. The correlations between the features of surface topography and helix pitch of cholesteric supramolecular structure were found and discussed. DOI: 10.1103/PhysRevE.87.012503

引用

页数：9

共 49 条

[1] Color selectivity lent to a cholesteric liquid crystal by monitoring interface-induced deformations [J].

Agez, Gonzague ;

Bitar, Rajaa ;

Mitov, Michel .

SOFT MATTER, 2011, 7 (06) :2841-2847

[2] Realization of submicrometer structures by a confocal system on azopolymer films containing photoluminescent chromophores [J].

Ambrosio, A. ;

Camposeo, A. ;

Carella, A. ;

Borbone, F. ;

Pisignano, D. ;

Roviello, A. ;

Maddalena, P. .

JOURNAL OF APPLIED PHYSICS, 2010, 107 (08)

[3] Recent Advances in Colloidal and Interfacial Phenomena Involving Liquid Crystals [J].

Bai, Yiqun ;

Abbott, Nicholas L. .

LANGMUIR, 2011, 27 (10) :5719-5738

[4]

Belyakov V.A., 1992, Diffraction optics of complex-structured periodic media

[5] Cholesteric liquid crystal self-organization of gold nanoparticles [J].

Bitar, Rajaa ;

Agez, Gonzague ;

Mitov, Michel .

SOFT MATTER, 2011, 7 (18) :8198-8206

[6] Cholesteric mixture containing chiral-photochromic and diarylethene dopants as novel material with dual photochromism [J].

Bobrovsky, A ;

Boiko, N ;

Shibaev, VP ;

Zavarzin, I ;

Kalik, M ;

Krayushkin, M .

POLYMERS FOR ADVANCED TECHNOLOGIES, 2002, 13 (08) :595-600

[7] New chiral photochromic menthone-containing homopolymers and copolymers-synthesis, phase behaviour and photo-optical properties [J].

Bobrovsky, AY ;

Boiko, NI ;

Shibaev, VP .

LIQUID CRYSTALS, 1999, 26 (12) :1749-1765

[8] Phase diagrams and optical properties of new menthyl-containing LC copolymers forming chiral mesophases [J].

Bobrovsky, AY ;

Boiko, NI ;

Shibaev, VP .

LIQUID CRYSTALS, 1998, 24 (04) :489-500

[9] Photochromism in mixtures of liquid crystalline chiral copolymers with a photosensitive chiral dopant [J].

Bobrovsky, AY ;

Boiko, NI ;

Shibaev, VP .

LIQUID CRYSTALS, 1998, 25 (06) :679-687

[10] Photosensitive cholesteric polymers with azobenzene-containing chiral groups and mixtures of cholesteric copolymer with chiral-photochromic dopants [J].

Bobrovsky, AY ;

Boiko, NI ;

Shibaev, VP .

LIQUID CRYSTALS, 2001, 28 (06) :919-931

← 1 2 3 4 5 →