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Pontifical Catholic University of Rio de Janeiro

1. WENNDY STEFFANNÍA PANTOJA ROMERO. [en] LANGMUIR FILMS OF FATTY ACID MONOESTERS OF GLYCEROL.

Degree: 2019, Pontifical Catholic University of Rio de Janeiro

[pt] Ésteres de glicerol derivados de ácidos graxos são surfactantes não iônicos com aplicação como lubrificantes, agentes anti-estáticos, auxiliares de processamento, plastificantes, anti-espumas, agentes de dispersão e de outras aplicações que requerem atividade bifuncional. Os monoésteres de glicerol derivados de ácidos graxos naturais, tais como ácido octanóico (C menos 8), decanóico (C menos 10) e octadecanóico (C menos 18), foram sintetizados e caracterizados por técnicas de infravermelho e ressonância magnética nuclear de hidrogênio e carbono 13. Eles foram espalhados sobre uma subfase aquosa formando filmes de Langmuir em uma cuba de teflon. As propriedades interfaciais destes surfactantes foram investigadas na interface ar-água. Desta forma, foi também possível avaliar a isoterma de Langmuir Pi-A e as propriedades mecânicas das monocamadas através do módulo de compressão (Cs elevado a potencia negativa 1). As monocamadas mostraram um comportamento na fase de líquido expandido confirmado pelo módulo de compressão de 10 a 70 mN/m e na fase de líquido condensado confirmado pelo módulo de compressão de 70 a 175 mN/m. Por meio da espectroscopia de reflexão-absorção de infravermelho com fotomodulação (PM-IRRAS) e a microscopia no ângulo de Brewster (BAM) foi avaliada a organização dos filmes de Langmuir dos surfactantes. A elasticidade superficial dilatacional (E) dos filmes adsorvidos foram analisadas pelo método da gota pendente em um goniômetro.

[en] Fatty acid glycerol esters are non-ionic surfactants with application as lubricants, antistatic agents, processing aids, plasticizers, defoamers, dispersion aids and other applications requiring bifunctional activities. Monoesters of glycerol based on natural fatty acids such as octanoic acid (C less 8), decanoic acid (C less 10) and octadecanoic acid (C less 18), were synthesized and characterized by infrared and hydrogen nuclear magnetic resonance and carbon 13 nuclear magnetic resonance techniques. They were spread over the water subphase forming Langmuir films in a Teflon trough. The interfacial properties of these surfactants at the air/water interface have been investigated. Thus it was also possible to evaluate the Langmuir Pi-A isotherm and mechanical properties of the monolayers by calculating the compression modulus (Cs elevated to negative power 1). The monolayers showed a behavior in the expanded liquid phase, confirmed by the compression modulus between 10 and 70 mN/m and a behavior in the condensed liquid phase confirmed by the compression modulus between 70 and 175 mN/m. Through photomodulated-infrared reflection-absorption spectroscopy (PM-IRRAS) and Brewster angle microscopy (BAM) was evaluated organization of Langmuir films of surfactants. The surface dilatational elasticity (E) of the adsorbed films were analyzed by the pendant drop method with a goniometer apparatus.

Advisors/Committee Members: ANDRE SILVA PIMENTEL.

Subjects/Keywords: [pt] PROPRIEDADES MECANICAS; [en] MECHANICAL PROPERTIES; [pt] SURFACTANTES NAO IONICOS; [en] NON-IONIC SURFACTANTS; [pt] SURFACTANTES BIODEGRADAVEIS; [en] BIODEGRADABLE SURFACTANTS; [pt] FISICO-QUIMICA DE INTERFACES; [en] PHYSICAL CHEMISTRY OF INTERFACES; [pt] MODULO DE COMPRESSAO; [en] COMPRESSIONAL MODULUS; [pt] ESPECTROSCOPIA DE REFLEXAO-ADSORCAO NO INFRAVERMELHO; [en] INFRARED REFLECTION-ADSORPTION SPECTROSCOPY; [pt] MONOCAMADAS; [en] MONOLAYERS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

ROMERO, W. S. P. (2019). [en] LANGMUIR FILMS OF FATTY ACID MONOESTERS OF GLYCEROL. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36991

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

ROMERO, WENNDY STEFFANNÍA PANTOJA. “[en] LANGMUIR FILMS OF FATTY ACID MONOESTERS OF GLYCEROL.” 2019. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed August 09, 2020. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36991.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

ROMERO, WENNDY STEFFANNÍA PANTOJA. “[en] LANGMUIR FILMS OF FATTY ACID MONOESTERS OF GLYCEROL.” 2019. Web. 09 Aug 2020.

Vancouver:

ROMERO WSP. [en] LANGMUIR FILMS OF FATTY ACID MONOESTERS OF GLYCEROL. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. [cited 2020 Aug 09]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36991.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

ROMERO WSP. [en] LANGMUIR FILMS OF FATTY ACID MONOESTERS OF GLYCEROL. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36991

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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