Exploració per tema "Cel·lulosa"
Ara es mostren els items 1-20 de 87
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A novel enzymatic approach to nanocrystalline cellulose preparation
(2018-06-01)
Article
Accés obertIn this work, conditions for an enzymatic pretreatment prior to NCC isolation from cotton linter were assessed. Different cellulase doses and reaction times were studied within an experimental design and NCC were obtained. ... -
Advanced overview of bacterial nanocellulose manufacturing for novel applications. Analysis of biosynthesis, chemical treatments, processing, and properties
(Universitat Politècnica de Catalunya, 2022-10-25)
Projecte Final de Màster Oficial
Accés obertThe manipulation, assembly, and control of matter at the nanometer scale enable the fabrication of nanomaterials that could revolutionize the industry and impact our society. Various bacterial species such as K. xylinus ... -
Aplicaciones de materiales fibrosos moldeados procedentes de reciclaje: caso: trasdosados en rehabilitación de edificios
(Universitat Politècnica de Catalunya, 2014-12)
Projecte Final de Màster Oficial
Accés obertLa investigación que se planteará a continuación se enfocará en el estudio de una propuesta de trasdosado de fibras prensadas y conformadas para que se simplifique e industrialice los actuales procesos en rehabilitación ... -
Assessment of chemical and mechanical behavior of bamboo pulp and nanofibrillated cellulose exposed to alkaline environments
(2019-08-27)
Article
Accés obertThis study was performed to study the effects of the cement paste composition (calcium aluminate cement—CAC and a geopolymer in comparison to Portland cement—OPC) on bamboo pulp and nanofibrillated cellulose (NFC). The ... -
Bacterial cellulose matrices to develop enzymatically active paper
(2020-01-31)
Article
Accés obertThis work studies the suitability of bacterial cellulose (BC) matrices to prepare enzymatically active nanocomposites, in a framework of more environmentally friendly methodologies. After BC production and purification, ... -
Breve estado del arte de la celulosa bacteriana y sus aplicaciones
(OmniaScience, 2024-01)
Comunicació de congrés
Accés obertLa celulosa es un biopolímero, el cual constituye la pared celular de las plantas, junto con la lignina y la hemicelulosa. La celulosa también puede ser producida por microorganismo, tales como bacterias. Esta celulosa, ... -
Cellulose nanofiber nanocomposite pervaporation membranes for ethanol recovery
(American Chemical Society, 2021-01-12)
Article
Accés obertIn spite of the growing interest to exploit nanocellulose in membranes for water purification, reverse osmosis, packaging, and other applications, examples of nanocellulose-containing membranes for pervaporation are rather ... -
Challenges in synthesis and analysis of asymmetrically grafted cellulose nanocrystals via atom transfer radical polymerization
(2021-06-01)
Article
Accés obertWhen cellulose nanocrystals (CNCs) are isolated from cellulose microfibrils, the parallel arrangement of the cellulose chains in the crystalline domains is retained so that all reducing end-groups (REGs) point to one ... -
Characterization of composite biofilms of wheat gluten and cellulose acetate phthalate
(2004-06)
Article
Accés obertThe objective of this research was to develop and characterize composite biofilms produced using wheat gluten and cellulose acetate phthalate. Biofilms act as barriers to moisture and oxygen diffusion through the film. The ... -
Chemical modification of cellulose for electrospinning applications
(Universitat Politècnica de Catalunya / Tallinna Tehnikaülikool (Tallin University of Technology), 2013)
Treball Final de Grau
Accés restringit per decisió de l'autor
Realitzat a/amb: Tallinna TehnikaülikoolThe aim of the thesis is to develop technology for producing cellulose fatty acid esters that later will be used to produce fibrous materials by means of electrospinning. Main material of the study is cellulose-stearate ... -
Comparative evaluation of the action of two different endoglucanases. Part I: on a fully bleached, commercial acid sulfite dissolving pulp
(2015-04-19)
Article
Accés obertA fully bleached commercial acid dissolving pulp was treated with two endoglucanases, one obtained from Paenibacillus barcinonensis (B) and the other one produced from Cerrena unicolor (F) with the intention to improve ... -
Comparative evaluation of the action of two different endoglucanases. Part II: on a biobleached acid sulphite pulp
(2015-04-30)
Article
Accés obertA TCF sulphite pulp, bleached at the laboratory scale with a laccase–violuric acid system and complemented with a pressurized hydrogen peroxide stage, was treated with two endoglucanases, one obtained from Paenibacillus ... -
Composites of cellulose nanocrystals in combination with either cellulose nanofibril or carboxymethylcellulose as functional packaging films
(Elsevier, 2022-06-30)
Article
Accés obertCellulose nanocrystals (CNC) were mixed with either cellulose nanofibril (CNF) or carboxymethylcellulose (CMC) in variable proportions (0/100, 20/80, 40/60, 50/50, 60/40, 80/20 and 100/0) to obtain cast films with acceptable ... -
Conferring antioxidant capacity to cellulose based materials by using enzymatically-modified products
(2015-05-30)
Article
Accés obertA new, industrially feasible method for conferring cellulosic substrates antioxidant properties by using enzymatic products was developed. The method allows cellulose surfaces such as those of paper sheets to be conferred ... -
Desarrollo de mortero con agregado a base de celulosa de papel
(Universitat Politècnica de Catalunya, 2019-05-17)
Projecte Final de Màster Oficial
Accés restringit per decisió de l'autorLa presente investigación busca innovar entorno a los métodos constructivos y su aplicación de manera sostenible. La investigación se enfoca en la adición de la pulpa de celulosa de papel reciclado en el mortero, sirviendo ... -
Desenvolupament de mètodes analítics per la mesura de concentració de nanopartícules en aigua
(Universitat Politècnica de Catalunya, 2019-05-20)
Treball Final de Grau
Accés obertEl treball va adreçat a posar a punt 3 mètodes d'anàlisi (UV, turbidimetria i digestió i anàlisi) per la determinació de la concentració de suspensions de nanopartícules en aigua. S'assajaran sistemes d'interès formats per ... -
Developing antioxidant capacity to cellulose-based materials by using enzymatically-modified products
(2015)
Comunicació de congrés
Accés restringit per política de l'editorialIn the present work various laccases (Lac) and different phenolic compounds potentially possessing antioxidant action were used in an enzymatic reaction to prepare several functionalization solutions (FS), which were then ... -
Development of advanced and multifunctional biomaterials from two- or three-dimensional structures of cellulose
(2023-05-17)
Comunicació de congrés
Accés obert -
Diseño de costes de una empresa industrial productora de pasta de celulosa
(Universitat Politècnica de Catalunya, 2020-06)
Treball Final de Grau
Accés restringit per acord de confidencialitat
Realitzat a/amb: Universidad de Buenos Aires -
Disseny i prototipatge d'una línia de productes sostenibles basats en cel·lulosa
(Universitat Politècnica de Catalunya, 2023-10)
Treball Final de Grau
Accés obertL'objecte principal d'aquest projecte és el paper. Aquest material es tracta, primer de tot, des de la banda teòrica: explorant en quin punt es troba la indústria paperera i analitzant les oportunitats i amenaces que rep ...