Nonlinear Refractive Index and Thermal Diffusivity Measurements Near the Reentrant Isotropic – Discotic Nematic Phase Transition

2008 ◽  
Vol 494 (1) ◽  
pp. 187-194
Author(s):  
N. M. Kimura ◽  
P. A. Santoro ◽  
S. L. Gómez ◽  
A. J. Palangana
Keyword(s):  
Phase Transition ◽  
Refractive Index ◽  
Thermal Diffusivity ◽  
Nonlinear Refractive Index ◽  
Nematic Phase ◽  
Diffusivity Measurements

Refractive index measurements in a reentrant discotic nematic–biaxial nematic phase transition

2018 ◽  
Vol 91 (8) ◽  
pp. 833-839 ◽  
Author(s):  
W.S. Braga ◽  
D.D. Luders ◽  
O.R. Santos ◽  
A.R. Sampaio ◽  
N.M. Kimura ◽  
...  
Keyword(s):  
Phase Transition ◽  
Refractive Index ◽  
Nematic Phase ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

Thermal diffusivity measurements in a lyotropic discotic nematic phase

2007 ◽  
Vol 370 (2) ◽  
pp. 173-176 ◽  
Author(s):  
N.M. Kimura ◽  
A. de Campos ◽  
P.A. Santoro ◽  
M. Simões ◽  
S.L. Gómez ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Nematic Phase ◽  
Diffusivity Measurements

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

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.

Polar and nonpolar orderings in the electrically induced isotropic-nematic phase transition

2008 ◽  
Vol 78 (4) ◽  
Author(s):  
Mingxia Gu ◽  
Sergij V. Shiyanovskii ◽  
Oleg D. Lavrentovich
Keyword(s):  
Phase Transition ◽  
Nematic Phase
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