Banca de DEFESA: PAMELA SANTOS TERCEIRO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PAMELA SANTOS TERCEIRO
DATE: 01/03/2024
TIME: 14:00
LOCAL: Auditório do IF/ https://meet.google.com/mee-qbip-syr
TITLE:

NONLINEAR PROPERTIES OF NANOSTRUCTURED MATERIALS

KEY WORDS:

Liquid crystals. Carbon quantum dots. Nonlinear optical properties. Solvents. Z-scan

PAGES: 162
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUBÁREA: Física da Matéria Condensada
SPECIALTY: Prop. Óticas e Espectrosc. da Mat. Condens; Outras Inter. da Mat. com Rad. e Part.
SUMMARY:

This study is dedicated to investigating the thermo-optical and nonlinear response of complex fluids such as liquid crystals, carbon quantum dots, and dyes in various solvents. Using the time-resolved z-scan technique, we explore the impact of adding carbon quantum dots derived from dansyl chloride (CD-DsCl) on the nonlinear refractive coefficient in planar liquid crystal samples. In the study of CD-DsCl addition in liquid crystals, we analyze the dependence of the nonlinear optical response on temperature, especially near the smectic-A to nematic and nematic to isotropic phase transitions. We also investigate the effects of an external electric field on these samples. Our preliminary results indicate that liquid crystal samples doped with carbon quantum dots may exhibit an enhanced nonlinear optical response, depending on the intensity of the applied external field. This study contributes to the understanding of nonlinear optical phenomena in liquid crystal systems doped with carbon quantum dots. We also investigate the effect of solvents on the nonlinear optical properties of the tautomeric forms of methyl orange through experimental approaches. Our results show that in the presence of different solvents, methyl orange exhibits a negative nonlinear optical behavior, and a red shift in its linear absorption is observed as the solvent polarity increases. This work contributes to advancing the understanding of the basic physics of organic compounds.

This study is dedicated to investigating the thermo-optical and nonlinear response of complex fluids such as liquid crystals, carbon quantum dots, and dyes in various solvents. Using the time-resolved z-scan technique, we explore the impact of adding carbon quantum dots derived from dansyl chloride (CD-DsCl) on the nonlinear refractive coefficient in planar liquid crystal samples. In the study of CD-DsCl addition in liquid crystals, we analyze the dependence of the nonlinear optical response on temperature, especially near the smectic-A to nematic and nematic to isotropic phase transitions. We also investigate the effects of an external electric field on these samples. Our preliminary results indicate that liquid crystal samples doped with carbon quantum dots may exhibit an enhanced nonlinear optical response, depending on the intensity of the applied external field. This study contributes to the understanding of nonlinear optical phenomena in liquid crystal systems doped with carbon quantum dots. We also investigate the effect of solvents on the nonlinear optical properties of the tautomeric forms of methyl orange through experimental approaches. Our results show that in the presence of different solvents, methyl orange exhibits a negative nonlinear optical behavior, and a red shift in its linear absorption is observed as the solvent polarity increases. This work contributes to advancing the understanding of the basic physics of organic compounds.

 

COMMITTEE MEMBERS:
Interno(a) - 1695829 - ANDRE DE LIMA MOURA
Interno(a) - 2458049 - ITALO MARCOS NUNES DE OLIVEIRA
Externo(a) ao Programa - 3826221 - LIDIANE MARIA OMENA DA SILVA LEAO - nullPresidente - 2621034 - MARIA SOCORRO SEIXAS PEREIRA
Externo(a) ao Programa - 1120709 - MARIA TEREZA DE ARAUJO - UFALExterno(a) à Instituição - SARAH ISABEL PINTO MONTEIRO DO NASCIMENTO ALVES - UNIFESP