The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Cellulose diacetate (CA) was successfully dissolved in N-methylmorpholine N-oxide aqueous solution (NMMO·H2O). The CA degraded little during the dissolving process and the homogenous CA/NMMO·H2O solutions were obtained even when the concentration was up to 18%. From the rheological behavior of the CA/NMMO·H2O solution, it was found that the viscosity of the solution was lower than that of lyocell...
Cellulose nanocrystals (CNCs) have attracted considerable attention as nanofillers to enhance the crystallization of poly(lactic acid) (PLA) and to improve the mechanical properties of the composites. There are two challenges: the inferior thermostability of CNCs and the compatibility of CNCs and polymeric matrix. Poly(ethylene glycol) epoxide, a compatibilizer and carrier, was grafted on CNC surfaces...
The pretreatment of renewable resources is the first step to make them metabolically available for microorganisms for generation of value-added products by fermentation. In this research, barley husk (BH) and oat husk (OH) were used as renewable resources to study the optimization of dilute acid pretreatment conditions by using Response Surface Methodology (RSM). Temperature (T, 110–130 °C), solid-to-liquid...
This work aims at the development and characterisation of bio-based active bi-layer films by solvent casting and electrospinning in order to be used for setting up active packaging solutions. Ethyl cellulose was used as the main material for the production of a layer on microfibrillated cellulose (MFC) films. This layer was formed with and without the incorporation of cinnamaldehyde (CNMA) which was...
In this research, cotton fabrics were selectively oxidized by periodate to produce aldehyde groups at C2 and C3 positions. Their changes in physico-chemical properties such as crystallinity, surface morphology, tensile strength, iodine sorption value and aldehyde group content were determined by different analytic methods. It was concluded that the periodate oxidization could decrease the crystallinity,...
Consumer concerns about synthetic additives is increasing and it can be interesting to apply natural antioxidants with antimicrobial properties. Developing a packing material composed by a natural polymer, such as bacterial nanocellulose membrane (BNCm) loaded with nisin may be applied as a method to keep food quality and to inhibit growth of microbial contaminants. For this reason, the aim of this...
High content of oil aerosols exist in the ambient air. In this study, the kapok fiber was studied for removing oil aerosols due to its oleophilic property and large lumen. The influence of the kapok fiber on filtration performance of air filter papers against the di-(2-ethyl hexyl) sebacate (DEHS) oil aerosols was analyzed. Firstly, different contents of kapok fibers were blended with hardwood fibers...
The nanoscale hygromechanical behavior of lignin is presented in this work. Three atomic force microscopy experimental methods were used to correlate moisture sorption of lignin to its mechanical behavior. First, sorption isotherms were established using cantilever mass sensing and subsequently predicted using the Guggenheim–Anderson–de Boer model. The sorption isotherms of lignin particles followed...
The first triple-functional polyoxometalate Cs10.6[H2.4GeNb13O41] (CsGeNb) was evaluated for its catalytic activity in production of methyl levulinate (ML) from biomass substrates in methanol. Higher conversion of cellulose (86.0%) and higher yield of ML (53.0%) were obtained under optimized reaction conditions of 0.1 g of cellulose, 0.04 mmol of catalyst, and 6 mL of methanol at 165 °C for 10 h,...
Cellulosic fibers are usually finished with flame retardant via repeated pad-dry-cure processes. The present contribution reports a simple, facile, and one-pot chemical treatment process to access durable flame retardant lyocell fibers by directly immersing the fibers into the solution of a flame retardant ester of 2,2-ethanolamine diphosphoric acid (EADP) and urea for a certain time without using...
Water pollution with toxic dyes threatens human health world-wide. Herein, we prepared an effective adsorbent hydrogel for removing toxic cationic crystal violet (CV) dye from its aqueous solutions using biodegradable polymers such as; xanthan gum (XG) and poly (N-vinyl imidazole) (PVI). The structure and morphology of the prepared XG/PVI hydrogel and CV loaded hydrogel were characterized by FTIR,...
Hybrid materials (HMs) based on a combination of bacterial cellulose (BC) and hydroxyapatite (HA) have demonstrated promising capabilities, especially for bone repair. The insertion of strontium into a BC/HA matrix has a role in the body related to bone remodeling. This study aimed to obtain HMs containing BC/HA doped with strontium ions (Sr2+) by two routes of synthesis, differing in the way strontium...
In the present study, we report novel sheet-like cellulose nanocrystal–zinc oxide nanohybrids (CNC–ZnO) by using a one-step hydrothermal method. Various concentrations of Zn2+ ions were functionalized in CNC surface and a possible mechanism for the formation of CNC–ZnO nanohybrids with hexagonal sheet-like structure converted to the flower-like structure was also presented. Additionally, the sheet-like...
This work focused on an eco-friendly and facile method to produce lignocellulose nanofibrils (LCNFs) by the one-step grinding of original poplar wood. An array of detailed characterizations were performed to elucidate the effect of the residual lignin (22.1, 14.1, 8.2, 2.0, 0.4 and 0.2%) on the properties of LCNFs and its films. The LCNFs were rather sensitive to ultraviolet absorption, low-viscosity...
In this work, a fixed amount of acrylamide and different amounts of acrylic acid were grafted on carboxymethyl cellulose (CMC) to get a nanosized gel with enhanced adsorption capacity. Successful grafting was demonstrated by FTIR and XRD analysis. By increasing the concentration of the grafting reactants, the average particle size of the prepared gels was reduced according to TEM and particle size...
The acetylation behavior of xylan and cellulose in kraft pulp (KP) was investigated. Heteronuclear single quantum coherence-nuclear magnetic resonance (HSQC-NMR) spectroscopy was used to identify the positions at which the hydroxyl groups of polysaccharides were acetylated. X-ray diffraction analysis was used to determine the acetylation of cellulose in the crystal region. It was found that only xylan...
Cellulose nanocrystal (CNC) composite coatings may impart many benefits in packaging, electronic, optical, etc. applications, however, large-scale cellulose coating production is a major engineering challenge. A versatile roll-to-roll reverse gravure process for the manufacture of cellulose nanocrystal-poly(vinyl alcohol) (CNC–PVA) coatings on a flexible polymer substrate was investigated in the present...
A novel and environmentally-friendly strategy for integrated bio-treatment (namely the biodesizing and bioscouring) of grey cotton in one-step to degrade and/or remove impurities was constructed on the basis of catalytic reactions from mixed enzymes, by employing reverse microemulsion in supercritical carbon dioxide fluid (SCF-CO2) media as an alternative to heavily polluting wet-chemical processes...
Chemically crosslinked cellulose hydrogels have wide applications in agriculture and biomedicine, but most crosslinking methods involve potentially toxic crosslinking chemistries or lack significant control over the final modulus of the material. To overcome these challenges, carboxymethyl cellulose (CMC) hydrogels were synthesized utilizing thiol-ene click chemistry. CMC was functionalized with norbornene...
Superhydrophobic material involves the fabrication of appropriate roughness and low surface energy. Studies concerning enhancing the attachment between substrates and low surface energy material have been reported. Hence, it might also be feasible to make low surface energy material as an interface binder to enhance the attachment. In our work, the simple dip-coating method was used to fabricate polybenzoxazine...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.