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| ROMBALDO,CARLA F.S.; LISBOA,ANTONIO C.L.; MENDEZ,MANOEL O.A.; COUTINHO,APARECIDO R.. |
| Jute fiber is the second most common natural cellulose fiber worldwide, especially in recent years, due to its excellent physical, chemical and structural properties. The objective of this paper was to investigate: the thermal degradation of in natura jute fiber, and the production and characterization of the generated activated carbon. The production consisted of carbonization of the jute fiber and activation with steam. During the activation step the amorphous carbon produced in the initial carbonization step reacted with oxidizing gas, forming new pores and opening closed pores, which enhanced the adsorptive capacity of the activated carbon. N2 gas adsorption at 77K was used in order to evaluate the effect of the carbonization and activation steps. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activation; Adsorption; Carbonization; Jute fiber; Thermogravimetry. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402137 |
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| MELO,Calionara Waleska Barbosa de; Bandeira,Matheus de Jesus; MACIEL,Leonardo Fonseca; BISPO,Eliete da Silva; SOUZA,Carolina Oliveira de; SOARES,Sérgio Eduardo. |
| Abstract The objective of the present study was to characterize the physicochemical composition and to quantify the fatty acids of chocolates produced from different cocoa varieties (Theobroma cacao L.) cultivated in the Southern Region of Bahia. Nine samples of monovarietal chocolates were evaluated, according to their physical, thermal and fatty acid profile. The results were subjected to tests of variance and multivariate statistics. The chocolates PH16 and TSH1188 presented higher melting point. It was possible to identify a linear correlation between the fat content of the chocolates and the break force parameter. The chocolates showed higher concentration of saturated fatty acids, mainly palmitic acid (16:0) and stearic acid (18:0), followed by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Monovarietal chocolate; Cocoa solids; Thermogravimetry. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612020000200326 |
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| Cuadros, Javier; Michalski, Joseph R.; Dekov, Vesselin; Bishop, Janice; Fiore, Saverio; Dyar, M. Darby. |
| Seafloor hydrothermal sites generate abundant Mg- and Fe-rich clays. These clays are structurally and compositionally interesting because these environments are characterized by large, dynamic temperature and chemical gradients in their deposition environment, which promote the formation of chemically and structurally complex clays, including interstratified phases. The system is also interesting as a proxy for the study of the large Mg- and Fe-rich phyllosilicate deposits on Mars, which are broadly characterized as smectitic clay of hydrothermal, volcanic or sedimentary origin. Thirty submarine samples and four terrestrial ones, for comparison, were studied by means of X-ray diffraction (XRD), thermogravimetry (TG), mid-IR and Mössbauer spectroscopies and... |
| Tipo: Text |
Palavras-chave: Interstratified clays; Martian clays; Submarine hydrothermal sites; Thermogravimetry; XRD. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00160/27131/25329.pdf |
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| SANTOS,Orquídea Vasconcelos dos; GONÇALVES,Bruno Santos; MACÊDO,Christine da Silva; CONCEIÇÃO,Leyvison Rafael Vieira da; COSTA,Carlos Emmerson Ferreira; MONTEIRO JÚNIOR,Ozéias Vieira; SOUZA,Amanda Larissa Garça de; LANNES,Suzana Caetano da Silva. |
| Abstract The objective of this research was to evaluate the quality parameters and the chromatographic, thermogravimetric, and spectroscopic profile of Patauá oil (Oenocarpus bataua). All analyses were performed according to the Recommended Practices of the American Oil Chemists’ Society (AOCS). The parameters obtained indicate conservation quality standards in accordance with Brazilian legislation. The fatty acid profile shows a predominance of ω-9, ω-6, and ω-3 fatty acids. The thermogravimetric behavior and differential analysis indicated good stability upon gradual temperature increase and the presence of endothermic and exothermic peaks characteristic of thermal and oxidative decomposition at high temperatures only. The spectroscopic profile evidenced... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oil; Patauá; Thermogravimetry; Infrared. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019005018101 |
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| SANTOS,Orquidea Vasconcelos; CORREA,Nádia Cristina Fernandes; CARVALHO JUNIOR,Raul; COSTA,Carlos Emmerson Ferreira da; MORAES,Jaqueline de Fátima Cabral; LANNES,Suzana Caetano da Silva. |
| Abstract These researches aimed determine the quality parameters, the nutritional profile, and the thermogravimetric and oxidative behavior of Muruci (Byrsonima crassifolia L .) oil obtained by supercritical CO2 extraction. The results showed an average oil yield of 5.50%. The acidity and peroxide values show good quality and conservation standards, according to the Brazilian legislation. The fatty acid profile indicates a predominance of unsaturated fatty acids with levels above 60%, highlighting the presence of fatty acids omega-6 and omega-9. The thermogravimetric curves showed oil stability at temperatures around 200 °C and exothermic peaks characteristic of mass loss close to 250 °C. The data of oxidative induction time determined by the Rancimat... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Muruci oil; Thermogravimetry. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000100172 |
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| Silva,Joanda Paolla Raimundo e; Reis,Malu Maria Lucas dos; Santana,Cleildo Pereira; Medeiros,Ana Cláudia Dantas de; Alves,Harley da Silva. |
| Tacinga inamoena (K. Schum.) N.P. Taylor & Stuppy, also known as quipá, is a native cactus of the Caatinga used in traditional medicine to treat urethral infections and inflammation. This study aimed to determine the physicochemical characteristics of vegetal drug obtained from the roots of T. inamoena. Analytical techniques and phytochemical tests were used, such as thermal analysis, qualitative and semiquantitative determination of secondary metabolites and spectroscopy at the infrared region. The powder of the vegetal drug met the parameters established by the Brazilian Pharmacopoeia, except for compressibility, which was low. On the thermogravimetric curve, three events related to the mass loss were verified, which correlate with the vegetal drug... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cactaceae; Quality control; Herbal medicine; Secondary metabolites; Thermogravimetry. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100602 |
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