Banca de QUALIFICAÇÃO: MAKEZIA MAYARA DA COSTA FREITAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAKEZIA MAYARA DA COSTA FREITAS
DATA : 28/08/2017
HORA: 14:30
LOCAL: SALA DE AULA DO NUPEG
TÍTULO:

"REVERSE MICELINE FORMATION STUDY IN NON-IONOTIC TENSIONIC SYSTEMS / ORGANIC SOLVENTS"

PALAVRAS-CHAVES:

Reverse Micelle, Non-ionic Surfactant, Apolar Solvent, SAXS, c.m.c.

PÁGINAS: 70
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Unlike studies about the formation of direct micelles, which can be evaluated with simple techniques such as conductivity and surface tension, it is difficult to obtain good and reproducible data when it comes to the formation of reverse micelles. In recent decades, reverse micelles have been systematically used as templates for the synthesis of nanomaterials, due to their ability to self-aggregate in diverse structures, passing these characteristics to the desired material. Therefore, the present work had the objective of studying the variation of carbonic solvent length, the degree of ethoxylation of the surfactants and the temperature in the formation of reverse micelles, with respect to the structural characteristics and cmc. Low angle X-ray scattering, and non-ionic ethoxylated nonylphthalic type non-ionic linear and non-ionic organic solvents both commercially obtained were chosen. A wide range of solvent-surfactant combinations were analyzed, the main results show that increasing the ethoxylation degree of the surfactant causes a decrease in c.m. The maximum dimensions of the micellar aggregates followed an increase both with the positive variation of the degree of surface ethoxylation and with the increase of the carbonic chain of the solvents. The carbon chain length of the surfactant and the temperature. As regards the formats acquired by the aggregates, there was a predominance of flat structure variation, passing through a solid and spherical hollow spherical structure in a decreasing scale of concentration of surfactant in the system.

 

MEMBROS DA BANCA:
Presidente - 1308273 - EDUARDO LINS DE BARROS NETO
Externo à Instituição - RICARDO PAULO FONSECA MELO - UFERSA
Externo ao Programa - 1801769 - SHIRLLE KATIA DA SILVA NUNES