scholarly journals The Design and Investigation of Nanocomposites Containing Dimeric Nematogens and Liquid Crystal Gold Nanoparticles with Plasmonic Properties Showing a Nematic-Nematic Phase Transition (Nu-Nx/Ntb)

Materials ◽  
2014 ◽  
Vol 7 (5) ◽  
pp. 3494-3511 ◽  
Author(s):  
Maria-Gabriela Tamba ◽  
Chih Yu ◽  
Bai Tang ◽  
Christopher Welch ◽  
Alexandra Kohlmeier ◽  
...  
Keyword(s):  
Phase Transition ◽  
Gold Nanoparticles ◽  
Liquid Crystal ◽  
Nematic Phase

scholarly journals Hydrophobic gold nanoparticles via silane conjugation: chemically and thermally robust nanoparticles as dopants for nematic liquid crystals

2013 ◽  
Vol 371 (1988) ◽  
pp. 20120256 ◽  
Author(s):  
Javad Mirzaei ◽  
Martin Urbanski ◽  
Heinz-S. Kitzerow ◽  
Torsten Hegmann
Keyword(s):  
Phase Transition ◽  
Gold Nanoparticles ◽  
Optical Properties ◽  
Liquid Crystal ◽  
Threshold Voltage ◽  
Nematic Phase ◽  
Dielectric Anisotropy ◽  
Smectic A ◽  
Gold Nps ◽  
First Time

We examine for the first time how chemically and thermally stable gold nanoparticles (NPs), prepared by a silane conjugation approach, affect both the thermal and the electro-optical properties of a nematic liquid crystal (LC), when doped at concentrations ranging from 0.25 to 7.5 wt%. We find that the octadecylsilane-conjugated gold NPs stabilize both the enantiotropic nematic and the monotropic smectic-A phases of the LC host with a maximum stabilization of 2 ° C for the nematic and 3.5 ° C for the smectic-A phases for the mixture containing 1 wt% of the silanized particles. The same mixture shows the lowest values for the Fréedericksz transition threshold voltage and the highest value for the dielectric anisotropy. Generally, all NP-containing mixtures, except mixtures with NP concentrations exceeding 5 wt%, reduce the threshold voltage, increase the dielectric anisotropy and reduce both rise and decay time; the latter particularly at temperatures at least 10 ° C below the isotropic–nematic phase transition on cooling.

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

Nematic-nematic phase transition in the liquid crystal dimer CBC9CB and its mixtures with 5CB: A high-resolution adiabatic scanning calorimetric study

2011 ◽  
Vol 84 (4) ◽  
Author(s):  
Chandra Shekhar Pati Tripathi ◽  
Patricia Losada-Pérez ◽  
Christ Glorieux ◽  
Alexandra Kohlmeier ◽  
Maria-Gabriela Tamba ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
High Resolution ◽  
Nematic Phase ◽  
Calorimetric Study

Prediction of the density–pressure–temperature behavior in the isotropic–nematic phase transition of MBBA liquid crystal

2020 ◽  
Author(s):  
E. García-Sánchez ◽  
L. H. Mendoza-Huizar ◽  
F. J. Martínez-Ruíz ◽  
J. R. Pasilla-Díaz ◽  
L. O. Solís-Sánchez ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Temperature Behavior

Isotropic-to-Nematic Phase Transition in a Liquid-Crystal Droplet

Langmuir ◽  
2008 ◽  
Vol 24 (2) ◽  
pp. 541-546 ◽  
Author(s):  
Xuemei Chen ◽  
Benjamin D. Hamlington ◽  
Amy Q. Shen
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Liquid Crystal Droplet

scholarly journals Miscibility studies of two twist-bend nematic liquid crystal dimers with different average molecular curvatures. A comparison between experimental data and predictions of a Landau mean-field theory for the NTB–N phase transition

2016 ◽  
Vol 18 (6) ◽  
pp. 4394-4404 ◽  
Author(s):  
D. O. López ◽  
B. Robles-Hernández ◽  
J. Salud ◽  
M. R. de la Fuente ◽  
N. Sebastián ◽  
...  
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Mean Field Theory ◽  
Mean Field ◽  
Landau Model ◽  
First Order ◽  
Miscibility Studies

We have developed a Landau model that predicts a first order twist-bend nematic–nematic phase transition.

Critical behavior at the isotropic-to-nematic phase transition in a bent-core liquid crystal

2006 ◽  
Vol 73 (3) ◽  
Author(s):  
D. Wiant ◽  
S. Stojadinovic ◽  
K. Neupane ◽  
S. Sharma ◽  
K. Fodor-Csorba ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Critical Behavior ◽  
Nematic Phase

Effects of the preparing condition of a polymer-stabilised liquid crystal with a smectic-A−chiral nematic phase transition on its properties

2009 ◽  
Vol 36 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Guohui Pan ◽  
Yubo Cao ◽  
Renwei Guo ◽  
Huicong Cheng ◽  
Zhou Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Smectic A ◽  
Chiral Nematic
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