PHASE ORDERING IN MIXTURES OF LIQUID CRYSTALS AND NANOPARTICLES

被引：4

作者：

Rozic, Brigita ^{[1
]}

Jagodic, Marko ^{[2
]}

Gyergyek, Saso ^{[1
]}

Lahajnar, Gojmir ^{[1
]}

Popa-Nita, Vlad ^{[3
]}

Jaglicic, Zvonko ^{[2
]}

Drofenik, Mihael ^{[1
]}

Kutnjak, Zdravko ^{[1
]}

Kralj, Samo ^{[1
,4
]}

机构：

[1] Jozef Stefan Inst, Jamova 39, Ljubljana 1000, Slovenia

[2] Inst Math Phys & Mech, Ljubljana 1000, Slovenia

[3] Univ Bucharest, Fac Phys, Bucharest 077125, Romania

[4] Univ Maribor, Fac Nat Sci & Math, Maribor 2000, Slovenia

来源：

METASTABLE SYSTEMS UNDER PRESSURE | 2010年

关键词：

liquid crystals; nanoparticles; mixtures; structural ordering; magnetoelectircs; CARBON NANOTUBES; ALIGNMENT; SUSPENSIONS;

D O I：

10.1007/978-90-481-3408-3_9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have studied the coupling interaction between liquid crystal (LC) molecules and nanoparticles (NPs) in LC+NPs mixtures. Using a simple phenomenological approach, possible structures of the coupling term are derived for strongly anisotropic NPs. The coupling terms include (i) an interaction term promoting the mutual ordering of the LC molecules and the NPs, and (ii) the Flory-Huggins-type term enforcing the phase separation. Both contributions exhibit the same scaling dependence on the diameter of the NPs. However, these terms only exist for a finite degree of nematic LC ordering. The magnetic response due to the LC-NPs coupling is probed experimentally for a mixture of weakly anisotropic magnetic NPs and a ferroelectric LC. A finite coupling effect was observed in the ferroelectric LC phase, suggesting such systems can be used as soft magnetoelectrics.

引用

页码：125 / +

页数：3

共 21 条

[1]

[Anonymous], 1989, The theory of polymer dynamics

[2] Nanoparticle polymer composites: Where two small worlds meet [J].

Balazs, Anna C. ;

Emrick, Todd ;

Russell, Thomas P. .

SCIENCE, 2006, 314 (5802) :1107-1110

[3] THEORY OF MAGNETIC SUSPENSIONS IN LIQUID CRYSTALS [J].

BROCHARD, F ;

GENNES, PGD .

JOURNAL DE PHYSIQUE, 1970, 31 (07) :691-&

[4] ORIENTATION OF A SOLID PARTICLE EMBEDDED IN A MONODOMAIN NEMATIC LIQUID-CRYSTAL [J].

BURYLOV, SV ;

RAIKHER, YL .

PHYSICAL REVIEW E, 1994, 50 (01) :358-367

[5] GROWTH AND SINTERING OF FULLERENE NANOTUBES [J].

COLBERT, DT ;

ZHANG, J ;

MCCLURE, SM ;

NIKOLAEV, P ;

CHEN, Z ;

HAFNER, JH ;

OWENS, DW ;

KOTULA, PG ;

CARTER, CB ;

WEAVER, JH ;

RINZLER, AG ;

SMALLEY, RE .

SCIENCE, 1994, 266 (5188) :1218-1222

[6]

de Gennes P. G., 1993, The Physics of Liquid Crystals, V2nd ed

[7] Liquid crystal-carbon nanotube dispersions [J].

Dierking, I ;

Scalia, G ;

Morales, P .

JOURNAL OF APPLIED PHYSICS, 2005, 97 (04)

[8]

DOI M, 1981, J POLYM SCI POL PHYS, V19, P229, DOI 10.1002/pol.1981.180190205

[9] THE PRODUCTION AND STRUCTURE OF PYROLYTIC CARBON NANOTUBES (PCNTS) [J].

ENDO, M ;

TAKEUCHI, K ;

IGARASHI, S ;

KOBORI, K ;

SHIRAISHI, M ;

KROTO, HW .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1993, 54 (12) :1841-1848

[10] PHASE EQUILIBRIA IN SOLUTIONS OF ROD-LIKE PARTICLES [J].

FLORY, PJ .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1956, 234 (1196) :73-89

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