Seminário

Surfactant Synergy: Understanding interactions for enhanced performance

Sala 8.2.19, Ciências ULisboa

Por Gunjan Tyagi (Department of Chemical Engineering, Imperial College London, United Kingdom).

Surfactants play a pivotal role in a wide array of industrial and scientific applications, spanning from pharmaceutical formulations and agrochemicals to cosmetics. Their versatile properties are highly dependent on their ability to interact synergistically, either with each other or with other chemical components, to achieve desired performance outcomes. The talk will explore the fundamental principles and applications of surfactant synergy and performance, shedding light on the intricate interplay between surfactant molecules and their cooperative effects. In our study we examined the interactions between a model anionic and amphoteric surfactant pair in aqueous solution as a function of composition, at floating and fixed pH, employing a combination of experimental and theoretical approaches. An extensive series of pure and mixed ratios of sodium dodecyl sulfate (SDS) and N,N-dimethyldodecylamine N-oxide (DDAO) were investigated for various interaction parameters at fixed and floating pH. Reduction of pH however induced the formation of precipitate depending upon the molar ratio of mixed surfactant solutions. Overall, our findings demonstrate a pronounced synergistic interaction between SDS and DDAO, arising from diminished electrostatic and steric repulsions and enhanced lateral surfactant packing. The findings contribute to the evaluation of mixed surfactant performance and underlying mechanisms, which is essential for the development of efficient and effective surfactant formulations, which requires the selection of synergistic surfactant pairs and the optimization of their composition ratio to achieve the desired functionality. In parallel, our research also addresses the pressing need for effective cleaning and disinfection strategies in the context of the COVID-19 pandemic. A novel approach involving light-induced conformational changes in photo-surfactants (PS) is presented. These PS, mimicking common surfactants like CTAB, exhibit potential antimicrobial/viral potential. Such light-activated surfactants with enhanced performance can pave the way for the next generation of smart anti-microbial cleaning formulations, with profound health and well-being benefits.

11h00-12h00
CFTC - Centro de Física Teórica e Computacional
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A major vehicle to bring together the national Physical Chemistry community.

Seminário do Laboratório de Instrumentação e Física Experimental de Partículas, por Pedro Cruz (Northeastern University).

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Por Giosuè Muratore (DM Ciências ULisboa e CMAFcIO).

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Por Pedro Duarte (DM Ciências ULisboa, CMAFcIO).

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As candidaturas encontram-se encerradas. Obrigada aos quase 80 candidatos/as!

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Seminários Doutorais no âmbito da disciplina de Projeto de Investigação (Doutoramento em Ciências do Mar).

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Por Maria Manuel Torres (DM Ciências ULisboa e CMAFcIO).

Seminário do Centro de Matemática, Aplicações Fundamentais e Investigação Operacional, por Baptiste Claustre (aluno ENS Lyon, estagiário CMAFcIO).

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Por: Jorge Buescu (DM Ciências ULisboa e CMAFcIO).

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Um evento organizado no âmbito da Ação COST EURO-MIC, de cujo Comitê de Gestão Elisabete Silva, líder do Bioactive and Multifunctional Materials Lab do BioISI, faz parte.

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Por Jean-Baptiste Casteras (DM Ciências ULisboa e CMAFcIO).

Chegou a hora: os participantes do Programa Ser Cientista vão apresentar os projetos que desenvolveram ao longo de uma semana, acompanhados por docentes e investigadores de CIÊNCIAS. E todos podem assistir!

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Extended enrolement date until July 12th.

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Um evento de reunião da comunidade nacional nas diversas vertentes da informática, com a ambição de ser o fórum de eleição para a divulgação, discussão e reconhecimento de trabalhos científicos.

Are you ready for this year's edition?

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Investigação Ecológica ao Serviço da Conservação

A leading venue for presenting and discussing the latest research, industrial practice and innovations in dependable and secure computing.