Littérature scientifique sur le sujet « Derivati cellulosa »
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Articles de revues sur le sujet "Derivati cellulosa"
Demirdogen, Ruken Esra, Tuncay Yeşilkaynak, Tetyana Tishakova et Fatih Mehmet Emen. « Antibacterial Cellulose Acetate Microfibers Containing Pyridine Derivative Complexes ». Chemistry & ; Chemical Technology 15, no 2 (15 mai 2021) : 217–25. http://dx.doi.org/10.23939/chcht15.02.217.
Texte intégralKawamura, Kaito, Takatsugu Abera et Hiroshi Nonaka. « Extrusion Molding of Cellulosic Fibers Using Cellulose Derivative ». JAPAN TAPPI JOURNAL 72, no 3 (2018) : 321–27. http://dx.doi.org/10.2524/jtappij.72.321.
Texte intégralShaikh, Hamid M., Arfat Anis, Anesh Manjaly Poulose, Saeed M. Al-Zahrani, Niyaz Ahamad Madhar, Abdullah Alhamidi, Saleh Husam Aldeligan et Faisal S. Alsubaie. « Synthesis and Characterization of Cellulose Triacetate Obtained from Date Palm (Phoenix dactylifera L.) Trunk Mesh-Derived Cellulose ». Molecules 27, no 4 (21 février 2022) : 1434. http://dx.doi.org/10.3390/molecules27041434.
Texte intégralCorreia, Daniela M., Erlantz Lizundia, Rafaela M. Meira, Mikel Rincón-Iglesias et Senentxu Lanceros-Méndez. « Cellulose Nanocrystal and Water-Soluble Cellulose Derivative Based Electromechanical Bending Actuators ». Materials 13, no 10 (15 mai 2020) : 2294. http://dx.doi.org/10.3390/ma13102294.
Texte intégralNechifor, Aurelia Cristina, Andreia Pîrțac, Paul Constantin Albu, Alexandra Raluca Grosu, Florina Dumitru, Ioana Alina Dimulescu (Nica), Ovidiu Oprea, Dumitru Pașcu, Gheorghe Nechifor et Simona Gabriela Bungău. « Recuperative Amino Acids Separation through Cellulose Derivative Membranes with Microporous Polypropylene Fiber Matrix ». Membranes 11, no 6 (5 juin 2021) : 429. http://dx.doi.org/10.3390/membranes11060429.
Texte intégralSoto-Salcido, L. A., I. Anugwom, L. Ballinas-Casarrubias, M. Mänttäri et M. Kallioinen. « NADES-based fractionation of biomass to produce raw material for the preparation of cellulose acetates ». Cellulose 27, no 12 (29 mai 2020) : 6831–48. http://dx.doi.org/10.1007/s10570-020-03251-1.
Texte intégralDanilevicius, Almantas, Justina Dobiliene, Christoph Wutz et Jolanta Liesiene. « Phenoxyhydroxypropylhydroxyethylcellulose—new amphiphilic cellulose derivative ». Cellulose 14, no 4 (3 janvier 2007) : 321–29. http://dx.doi.org/10.1007/s10570-006-9105-9.
Texte intégralZhou, Xuesong, et Yong Huang. « Cellulose derivative-based cholesteric networks ». Journal of Applied Polymer Science 96, no 5 (2005) : 1648–53. http://dx.doi.org/10.1002/app.21617.
Texte intégralSimon, Mathilde, René Fulchiron et Fabrice Gouanvé. « Water Sorption and Mechanical Properties of Cellulosic Derivative Fibers ». Polymers 14, no 14 (12 juillet 2022) : 2836. http://dx.doi.org/10.3390/polym14142836.
Texte intégralPutri, Margaretha Efa, Anis Yohana Chaerunisaa et Marline Abdassah. « Cellulose Nanocrystals Preparation as Pharmaceuticals Excipient : a Review ». Indonesian Journal of Pharmaceutics 2, no 2 (4 mars 2020) : 42. http://dx.doi.org/10.24198/idjp.v2i2.26422.
Texte intégralThèses sur le sujet "Derivati cellulosa"
De, Matos Fernandes Susana. « Novel materialsbased in chitosan, its derivates and cellulose fibers ». Pau, 2010. http://www.theses.fr/2010PAUU3010.
Texte intégralThe purpose of this study was to develop new materials based on chitosan and its derivatives and cellulose, in the form of nanofibres or paper sheet. . Chitosan samples were then used to prepare transparent nanocomposite films based on different chitosan (CH) matrices (two chitosans with different DPs and corresponding water-soluble derivatives) and nanofibrillated cellulose (NFC) and bacterial cellulose (BC). The films obtained were shown to be highly transparent, displayed better mechanical properties than the corresponding unfilled chitosan films and showed increased thermal stability. Another approach involved the coating of E. Globulus based paper sheets with chitosan and two different chitosan derivatives, a fluorescent and a water-soluble derivative, on a pilot-size press machine. First, a fluorescent chitosan derivative was deposited layer-by-layer onto conventional paper sheets and its distribution was assessed. The results showed that the surface distribution was highly homogeneous and the penetration of chitosan within the paper pores ceased after a three-layer deposit, beyond coating only produced an increase in its overall thickness and film-forming aptitude. Then, the effect of chitosan and chitosan quaternization on the final properties of chitosan-coated papers was investigated. In general, both chitosan and water-soluble chitosan coatings had a positive impact on the final properties of the coated papers. Finally, chitin and chitosan were converted into viscous polyols through a simple oxypropylation reaction, with the aim of valorizing the less noble fractions or by-products of these valuable renewable resources
Ecker, Felix F. « Entwicklung schmelzextrudierter Arzneiformen auf Basis von Ether- und Ester-Derivaten der Cellulose / ». Berlin : Logos-Verl, 2001. http://www.gbv.de/dms/bs/toc/325417393.pdf.
Texte intégralPetzold, Matthias [Verfasser], Cordt [Akademischer Betreuer] Zollfrank, Volker [Gutachter] Sieber et Cordt [Gutachter] Zollfrank. « Bioinspirierte Catechol-Derivate der Cellulose / Matthias Petzold ; Gutachter : Volker Sieber, Cordt Zollfrank ; Betreuer : Cordt Zollfrank ». München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1162621168/34.
Texte intégralPetzold, Matthias [Verfasser], Cordt [Akademischer Betreuer] Zollfrank, Volker [Gutachter] Sieber et Cordt [Gutachter] Zollfrank. « Bioinspirierte Catechol-Derivate der Cellulose / Matthias Petzold ; Gutachter : Volker Sieber, Cordt Zollfrank ; Betreuer : Cordt Zollfrank ». München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/1235023265/34.
Texte intégralCandido, Rafael Garcia. « Utilização da celulose de resíduos lignocelulósicos para obtenção de produtos de alto valor agregado ». Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/97/97131/tde-22082013-161627/.
Texte intégralAs a consequence of sugarcane increased production in recent years, there was an increased of residues generation from this process, being the straw and bagasse the main ones. The production potential of these wastes represents around 14% of the processed sugarcane mass. Cellulose is the main constituent of these materials and may give rise to other materials by derivatization reactions. Among the most important derivatives of cellulose, are ethers and esters of cellulose. Cellulose can also be fragmented in order to use its monomer, the glucose. The present work aims at extracting the cellulose from sugarcane straw and bagasse to use it in the production of two derivatives, cellulose acetate and carboxymethylcellulose and to fragment it into glucose for studying the enzymatic hydrolysis, which is a required step for ethanol cellulosic production. For this, it was tested two pathways of cellulose obtaining, the acid route and the alkaline route. At the end of each stage of the process, the materials were characterized chemically in order to elucidate what occurred in each step. After finishing both processes, the material was subjected to reactions of acetylation and carboxymethylation. The cellulose derivates were characterized physically for its degree of substitution and for FTIR. The cellulose acetate was utilized to produce membranes through two different methods, the solvent evaporation and the phase inversion. The membranes were characterized for MEV, DMA and permeability test. They were also tested for cooper ions removal. All materials produced at both pathways were hydrolyzed enzymatically for the enzymes Celluclast 1.5L and ?-glucosidase. In all cases, the final material presented high level of cellulose (about 90,0%) and low level of lignin (low than 4,0%). The alkaline route can be considered the one which achieved the best results, since it was in this pathway that the lowest cellulose lost occurred. The cellulose acetates presented a degree of substitution 3, in other words, they are triacetates, ideal for membrane production. Nevertheless, the presence of lignin, even in low amount, did not allow producing membranes with high mechanic resistance. In general, the membranes were able to remove about 15,0% of cooper ions in a aqueous solution. Between the methods carried out, the phase inversion was the one which produced membranes with the best properties. In relation to carboxymethylcellulose, it was obtained CMCs with different characteristics and, once more, the lignin interfered in the process. The more lignin content before CMC production, the less degree of substitution obtained. In the reactions of enzymatic hydrolysis, the highest cellulose purity proportioned the highest glucose concentrations in the hidrolysates, and it was reached conversion values around 85,00%.
Cittadini, Anna Maria Roberta. « Development and characterization of regenerated cellulose membranes : from a biopolymer derivative to a microfiltration product ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/24999/.
Texte intégralChiba, Ryotaro. « Ion-mediated Control of Supramolecular Structure and Optical Properties of a Liquid-crystalline Cellulose Derivative ». Kyoto University, 2009. http://hdl.handle.net/2433/123980.
Texte intégral0048
新制・課程博士
博士(農学)
甲第14668号
農博第1750号
新制||農||968(附属図書館)
学位論文||H21||N4441(農学部図書室)
UT51-2009-D380
京都大学大学院農学研究科森林科学専攻
(主査)教授 西尾 嘉之, 教授 中坪 文明, 教授 木村 恒久
学位規則第4条第1項該当
Rohowsky, Juta. « Synthese und Charakterisierung neuartiger Cellulosederivate und deren Einsatz als Verkapselungsmaterialien ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-169486.
Texte intégralHildenbrand, Claudia. « Nanostructured carbons from cellulose-derivative-based aerogels for electrochemical energy storage and conversion : evaluation as EDLC electrode material ». Paris, ENMP, 2010. http://pastel.archives-ouvertes.fr/pastel-00547497.
Texte intégralNanostructured carbons are widely used in electrochemical energy storage and conversion devices, e. G. As electrode material for fuel cells, batteries, or still EDLCs (Electric Double Layer Capacitor). The carbon structure and surface chemistry are crucial parameters and consequently need to be adjusted to the specific application's requirements. This PhD thesis has aimed at developing a new family of nanostructured carbons: aerogels from renewable organic sol-gel precursors, i. E. Pyrolyzed cellulose-acetate-based aerogels. Sol-gel synthesis parameters and drying conditions of the organic gel, as well as pyrolysis parameters (particularly the influence of the sol composition, the type of catalyst used in the sol-gel synthesis step, pyrolysis temperature, and atmosphere) have been varied systematically in order to generate a broad range of structurally different cellulose-acetate-based carbonaceous aerogels. Further, cellulose-acetate-based carbon aerogels have been exposed to different post-treatments (e. G. Introduction of oxygen and nitrogen-containing surface functional groups) to create cellulose-acetate-based carbon aerogels with different surface chemistries. Finally, the performance of these cellulose-acetate-based carbon aerogels has been analyzed as EDLC electrode material
Klein, Manuela Poletto. « Imobilização de β-galactosidase para obtenção de produtos lácteos com baixo teor de lactose ». reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/24803.
Texte intégralβ-galactosidase (E.C 3.2.1.23) is the most widely used enzymes in the food industry and its employed in the lactose hydrolysis process. In this study, two methodologies were used to test their immobilization. In the first, the enzyme was immobilized by adsorption in one silica based hybrid material that contains a cationic organic group covalently linked. The efficiency of immobilization showed a decrease of 74 to 53% by increasing the protein load applied to the support. The low thermo stability of the immobilized enzyme and the probable weak interactions involved in their adsorption, could explain the decrease in enzyme activity observed in the successive batch hydrolysis of lactose. In the first run, the degree of lactose hydrolysis was 90.9% and, at the end of the last run (4th), the enzyme was able to convert only 13% of the substrate. The second methodology used was the covalent immobilization of the enzyme on a cellulose/ionic liquid film, modified with a polyamine and activated using glutaraldehyde. The presence of a polyamine was confirmed by infrared analysis. After immobilization, the enzyme retained 60% of its initial activity. Highly efficient lactose conversion was achieved in a batch process at 7ºC and 35ºC and was possible to reuse the immobilized enzyme in 16 repeated cycles, at 7ºC, without any drastic decrease in enzyme activity. Km value for the immobilized enzyme in silica based hybrid material was 9.17 mM and for the enzyme immobilized in the film of cellulose/ionic liquid was 11.22 mM, both showing an increase compared with the Km value for free enzyme (1.25 mM), due to the difficulty of access of the substrate to the active sites of the enzyme. The immobilized enzyme did not show any changes in the optimal pH and temperature when compared to the free enzyme in both methods tested.
Chapitres de livres sur le sujet "Derivati cellulosa"
Onofrei, Mihaela Dorina, Adina Maria Dobos et Silvia Ioan. « Processes in Cellulose Derivative Structures ». Dans Nanocellulose Polymer Nanocomposites, 355–91. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118872246.ch14.
Texte intégral« cellulose derivative ». Dans The Fairchild Books Dictionary of Textiles. Fairchild Books, 2021. http://dx.doi.org/10.5040/9781501365072.2803.
Texte intégralChristensen, B. E., B. T. Stokke et O. Smidsrød. « Xanthan—The natural water soluble cellulose derivative ». Dans Cellulose and Cellulose Derivatives, 265–78. Elsevier, 1995. http://dx.doi.org/10.1533/9781845698539.4.265.
Texte intégralJames, S. G., J. Schatzle, V. Tsakalos, E. Peuvrel-Disdier et P. Navard. « Flow-induced structures in isotropic and anisotropic cellulose derivative blends ». Dans Cellulose and Cellulose Derivatives, 393–400. Elsevier, 1995. http://dx.doi.org/10.1533/9781845698539.5.393.
Texte intégral« Electro-optical Properties of Cellulose Derivative Composites ». Dans Polysaccharides, 1143–60. CRC Press, 2004. http://dx.doi.org/10.1201/9781420030822-51.
Texte intégralFigueirinhas, J., P. Almeida et M. Godinho. « Electro-optical Properties of Cellulose Derivative Composites ». Dans Polysaccharides. CRC Press, 2004. http://dx.doi.org/10.1201/9781420030822.ch47.
Texte intégralVshivkov, Sergey, et Elena Rusinova. « Phase Transitions and Structure of Liquid Crystalline Cellulose Ether Solutions in a Magnetic Field and in Its Absence ». Dans Liquid Crystals [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101451.
Texte intégralMuratore, Florencia, María L. Goñi, Luis Serrano, Jalel Labidi, Silvia Barbosa et Raquel Martini. « Development of Bioactive Paper by Capsaicin Derivative Grafting Onto Cellulose ». Dans Biopolymer Grafting : Synthesis and Properties, 199–233. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-323-48104-5.00005-6.
Texte intégralAdelani Alabi, Kazeem, Rasheed Adewale Adigun, Ibrahim Olasegun Abdulsalami et Mariam Dasola Adeoye. « Furfural : A Versatile Derivative of Furan for the Synthesis of Various Useful Chemicals ». Dans Furan Derivatives - Recent Advances and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.100303.
Texte intégral« Carbonyl Dyes and Pigments ». Dans Colour Chemistry, 99–132. 2e éd. The Royal Society of Chemistry, 2014. http://dx.doi.org/10.1039/bk9781849733281-00099.
Texte intégralActes de conférences sur le sujet "Derivati cellulosa"
Guan, Wenchao, Gang Ke, Changyu Tang et Yifeng Liu. « Study on Lubrication Properties of Carboxymethyl Cellulose as a Novel Additive in Water-Based Stock ». Dans World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64250.
Texte intégralMiyagawa, Atsushi, Maria Carmelita Z. Kasuya, Kenichi Hatanaka et Koji Matsuoka. « SYNTHESIS OF POLYACRYLAMIDE CARRYING GLOBOTRIOSE DERIVATIVE FOR IMMOBILIZATION ON CELLULOSE MATERIALS ». Dans XXIst International Carbohydrate Symposium 2002. TheScientificWorld Ltd, 2002. http://dx.doi.org/10.1100/tsw.2002.624.
Texte intégralBen, Wang, Liu yanjie et Dai chuanbo. « REVIEW ON THE REGENERATION, DERIVATION AND DEGRADATION OF CELLULOSE IN IONIC LIQUID SYSTEM ». Dans International Conference on New Materials and Intelligent Manufacturing. Volkson Press, 2018. http://dx.doi.org/10.26480/icnmim.01.2018.58.61.
Texte intégralKIM, HONGHYUN, YEOUNSOO KIM, KWINAM PARK, SEOK-HEUNG JANG, SEOUNMOON LEE et JINWON PARK. « THE SEPARATION OF MODIFIED CELLULASE WITH POLYALKYLENE OXIEDE DERIVATE USING REACTIVE AQUEOUS TWO PHASE SYSTEM ». Dans Proceedings of the 4th International Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702623_0148.
Texte intégralKarlovits, Igor. « Lignocellulosic bio-refinery downstream products in future packaging applications ». Dans 10th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design,, 2020. http://dx.doi.org/10.24867/grid-2020-p2.
Texte intégral