Fechar
Metadados

@PhDThesis{Corcuera:2016:FiDLNa,
               author = "Corcuera, Valerie Cecile",
                title = "Filmes de DLC com nanocristais de diamante para 
                         aplica{\c{c}}{\~o}es espaciais",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2016",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2016-05-17",
             keywords = "Diamond Like-Carbon (DLC), nano part{\'{\i}}culas de diamante, 
                         filmes finos, nanodiamond particles, thin films.",
             abstract = "Devido {\`a} tend{\^e}ncia de aglomera{\c{c}}{\~a}o o 
                         desenvolvimento na funcionaliza{\c{c}}{\~a}o e posterior 
                         dispers{\~a}o do p{\'o} de nanodiamante (ND) produzido por 
                         detona{\c{c}}{\~a}o pode se tornar um desafio. O p{\'o} do ND 
                         foi purificado por meio de tratamento t{\'e}rmico e dois tipos de 
                         funcionaliza{\c{c}}{\~o}es foram alcan{\c{c}}adas ND-COOH e 
                         ND-H. A purifica{\c{c}}{\~a}o e as funcionaliza{\c{c}}{\~o}es 
                         foram alcan{\c{c}}adas com sucesso e foram verificadas por TGA e 
                         FT-IR. A an{\'a}lise de AFM mostrou que o tratamento t{\'e}rmico 
                         de oxida{\c{c}}{\~a}o que fornece a funcionaliza{\c{c}}{\~a}o 
                         do ND-COOH reduz os aglomerados em cerca de 74\% do tamanho 
                         original. O tamanho m{\'e}dio dos aglomerados do ND-COOH conforme 
                         medido por dispers{\~a}o din{\^a}mica de luz foi 
                         substancialmente reduzido em 95\% do tamanho original ap{\'o}s a 
                         funcionaliza{\c{c}}{\~a}o e desagrega{\c{c}}{\~a}o 
                         mec{\^a}nica do p{\'o} em meio l{\'{\i}}quido. A estabilidade 
                         da dispers{\~a}o do ND em solvente polar tetrahidrofurano 
                         aumentou consideravelmente apresentando um potencial zeta de -31 
                         mV. Esta tese contemplou o desenvolvimento de uma nova metodologia 
                         para a dispers{\~a}o dos aglomerados de nanodiamante (ND) em meio 
                         l{\'{\i}}quido. Filmes de carbono tipo diamante (DLC - 
                         Diamond-Like Carbon) contendo nano part{\'{\i}}culas de diamante 
                         foram depositados sobre amostras planas de liga de tit{\^a}nio 
                         Ti6Al4V pela t{\'e}cnica de DC pulsada PECVD (Plasma Enhanced 
                         Chemical Vapor Deposition). Solu{\c{c}}{\~o}es precursoras para 
                         deposi{\c{c}}{\~a}o de filme de DLC foram preparadas. Filmes de 
                         DLC e DLC-ND foram produzidos a partir de diferentes solventes de 
                         natureza polar e apolar e as suas propriedades foram avaliadas. 
                         An{\'a}lises comparativas de perfilometria, coeficiente de 
                         atrito, espectroscopia de espalhamento Raman foram abordadas. As 
                         an{\'a}lises de MEV e AFM revelaram a presen{\c{c}}a do ND no 
                         filme. ABSTRACT: Due to agglomeration tendency the development of 
                         functionalization and subsequent dispersion of detonation 
                         nanodiamond (ND) powder can become a challenge. ND powder was 
                         purified by heat treatment and two types of functionalizations 
                         were achieved ND-H and ND-COOH. Purification and 
                         functionalizations were successfully achieved and were verified by 
                         TGA and FT-IR. AFM analysis showed that the thermal oxidation 
                         treatment which provides ND-COOH functionalization reduces the 
                         agglomerates in about 74\% of the original size. The average size 
                         of ND-COOH agglomerates as measured by dynamic light scattering 
                         has been significantly reduced by 95\% of its original size after 
                         functionalization and mechanical shearing of the powder in a 
                         liquid medium. The stability of ND dispersion in polar solvent 
                         tetrahydrofuran increased considerably having a zeta potential of 
                         -31 mV. Development of a new method for the dispersion of 
                         agglomerated nano diamond (ND) in a liquid medium was included in 
                         this thesis. Diamond-Like Carbon (DLC) films with nano diamand 
                         particles were deposited on flat samples of titanium alloy Ti6Al4V 
                         by pulsed DC Plasma Enhanced Chemical Vapor Deposition (PECVD). 
                         Precursor solutions for DLC films deposition were presented. DLC 
                         and DLC-ND films were produced from different polar and nonpolar 
                         solvents and their properties were evaluated. Comparative analyzes 
                         profilometry, friction coefficient, Raman spectroscopy have been 
                         addressed. SEM and AFM analysis revealed the presence of ND in the 
                         film.",
            committee = "Trava-Airoldi, Vladimir Jesus (presidente/orientador) and Del 
                         Bosco, Edson and Machado, Jo{\~a}o Paulo Barros and Moro, 
                         Jo{\~a}o Roberto and Leite, Douglas Marcel Gon{\c{c}}alves",
           copyholder = "SID/SCD",
         englishtitle = "DLC films with diamond nanocrystals for space applications",
             language = "pt",
                pages = "106",
                  ibi = "8JMKD3MGP3W34P/3LTSK98",
                  url = "http://urlib.net/rep/8JMKD3MGP3W34P/3LTSK98",
           targetfile = "publicacao.pdf",
        urlaccessdate = "25 nov. 2020"
}


Fechar