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You searched for subject:(Poliacrilamida Teses ). One record found.

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1. Meiriane Cristina Faria Soares. Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono.

Degree: 2011, Universidade Federal de Minas Gerais

Fluids prepared with water, polyacrylamide (PAM) and carbon nanotubes (CNT) were studied viscosity and light scattering measurements. A previous characterization of PAM and CNT materials was also carried out. The carbon nanotube has a multi-walled structure, functionalized with 5% mass of acidic groups (MWCNT-COOH). Moreover, the CNT sample presents high purity (>95%), and diameter ranging from 5 to 10 nm. The polyacrylamides were characterized by NMR, CHN, TG, DSC, DLS1 and viscosity. Two fluid systems were investigated, one of them using commercial and the other one synthesized PAM. The difference between these two systems is the PAM characteristics. A commercial PAM, which is a copolymer of polyacrylamide containing 1 % acrylic acid (CPAM) and wM= 3.84 x 106 g.mol-1, was used at the concentration of 3 g.L-1 to produce the first set of fluids. The synthetic polyacrylamide (SPAM), Mw = 2.97 x 104 g.mol-1, was used to prepare dispersions in a concentration of 50 g.L-1. In both systems, the concentration of carbon nanotubes ranging from 0 to 1 % m/m (CNT/PAM). A decrease in the viscosity and an increase in the diffusion coefficient were observed for both fluids, as a function of CNT concentration . This can be explained by the reduction of the sizes of the polymeric coil (decrease in gyration radius) with increasing concentration of CNT. The results obtained from viscosity and light scattering showed a change of behavior at 0.2 m/m % of CNT for both systems, with different PAM. An abrupt decrease of viscosity and increase in diffusion coefficient was observed around this concentration. This may be consequence of the carbon nanotubes connecting polymeric coils, leading to group behavior in the diluted polymer concentration regime

Nesse trabalho foi realizado um estudo de fluidos preparados com água, poliacrilamida (PAM) e nanotubos de carbono (NTC) através de medidas de viscosidade e espalhamento de luz. Um estudo prévio de caracterização de ambos os materiais também foi realizado. O nanotubo de carbono utilizado possui paredes múltiplas e é funcionalizado com grupos ácidos (MWCNT-COOH). O NTC foi caracterizado quanto às suas propriedades térmicas e morfológicas, e apresentou uma alta pureza, um diâmetro que varia de 5 a 10 nm e aproximadamente 5% de funcionalização. As poliacrilamidas foram caracterizadas através de RMN, CHN, TG, DSC, espalhamento de luz e viscosidade. Dois sistemas fluidos foram investigados, um comercial e outro sintetizado. A diferença entre esses dois sistemas está na PAM utilizada. No preparo do sistema comercial contendo uma concentração fixa de 3 g.L-1 de PAM, utilizou-se uma PAM comercial que é um copolímero de poliacrilamida e 1% de ácido acrílico (CPAM) de massa molecular 3,84 x 106 g.mol-1. Já no sistema sintetizado,tr a concentração estudada foi de 50 g.L-1 da poliacrilamida sintetizada (SPAM) de massa molecular 2,97 x 104 g.mol-1. Ambos os sistemas foram preparados com quantidades de nanotubos variando de 0 a 1% m/m (NTC/PAM). Para ambos os sistemas observou-se uma diminuição da…

Advisors/Committee Members: Glaura Goulart Silva, Glaura Goulart Silva, Maria Elisa Scarpelli R e Silva, Fabiano Vargas Pereira.

Subjects/Keywords: Química Teses.  ; Físico-química Teses.  ; Nanotubos de carbono Teses.  ; Poliacrilamida Teses ; Polímeros  Teses.  

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APA (6th Edition):

Soares, M. C. F. (2011). Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono. (Thesis). Universidade Federal de Minas Gerais. Retrieved from http://hdl.handle.net/1843/SFSA-8YBNUU

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):

Soares, Meiriane Cristina Faria. “Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono.” 2011. Thesis, Universidade Federal de Minas Gerais. Accessed February 27, 2021. http://hdl.handle.net/1843/SFSA-8YBNUU.

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

MLA Handbook (7th Edition):

Soares, Meiriane Cristina Faria. “Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono.” 2011. Web. 27 Feb 2021.

Vancouver:

Soares MCF. Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono. [Internet] [Thesis]. Universidade Federal de Minas Gerais; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1843/SFSA-8YBNUU.

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

Council of Science Editors:

Soares MCF. Fluidos aquosos baseados em poliacrilamida e nanotubos de carbono. [Thesis]. Universidade Federal de Minas Gerais; 2011. Available from: http://hdl.handle.net/1843/SFSA-8YBNUU

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

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