Browsing by Subject "Cel·lulosa"
Now showing items 1-20 of 65
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A novel enzymatic approach to nanocrystalline cellulose preparation
(2018-06-01)
Article
Open AccessIn 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. ... -
Aplicaciones de materiales fibrosos moldeados procedentes de reciclaje: caso: trasdosados en rehabilitación de edificios
(Universitat Politècnica de Catalunya, 2014-12)
Master thesis
Open AccessLa 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
Open AccessThis 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
Open AccessThis 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, ... -
Cellulose nanofiber nanocomposite pervaporation membranes for ethanol recovery
(American Chemical Society, 2021-01-12)
Article
Open AccessIn 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
Open AccessWhen 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
Open AccessThe 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)
Bachelor thesis
Restricted access - author's decision
Covenantee: 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
Open AccessA 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
Open AccessA 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
Open AccessCellulose 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
Open AccessA 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)
Master thesis
Restricted access - author's decisionLa 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)
Bachelor thesis
Open AccessEl 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)
Conference lecture
Restricted access - publisher's policyIn 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 ... -
Diseño de costes de una empresa industrial productora de pasta de celulosa
(Universitat Politècnica de Catalunya, 2020-06)
Bachelor thesis
Restricted access - confidentiality agreement
Covenantee: Universidad de Buenos Aires -
Effect of surface charge on surface-initiated atom transfer radical polymerization from cellulose nanocrystals in aqueous media
(2016-04-11)
Article
Open AccessCellulose nanocrystals (CNCs) with different charge densities were utilized to examine the role of electrostatic interactions on surface-initiated atom transfer radical polymerization (SI-ATRP) in aqueous media. To this ... -
Effects of hydrothermal aging on the water uptake and tensile properties of PHB/flax fabric biocomposites
(2017-06-12)
Article
Open AccessThis research analyses the effect of hydrothermal aging on the water uptake and mechanical performance of biocomposites based on a polyhydroxyalkanoate matrix and flax fibre reinforcement in the form of nonwoven (NW) ... -
Electrochemical insights on the hydrophobicity of cellulose substrates imparted by the enzymatically-oxidized gallates with increasing alkyl chain length
(2015-06-09)
Article
Open AccessIn this work, we studied the influence of the alkyl chain length in enzymatically-oxidized gallates on the development of hydrophobicity on paper-based materials, and further correlated the obtained effect to the redox ... -
Elucidating the chemical nature of laccase-modified alkyl gallates
(2020-06-12)
Article
Open AccessIn the first part of the present work, relevant findings concerning the laccase (Lacc) activation of alkyl gallates, and its implementation in developing hydrophobic properties on cellulose-based substrates are reported. ...
