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.
This work was focused on the fabrication of a stable O/W Pickering emulsion by using cellulose-rich composites that prepared by selectively oxidation with sodium periodate firstly, and followed by grafting dodecylamine to the 2,3-dialdehyde cellulose particles. The structure and properties of the modified cellulose microparticles were characterized, and the performance for the stabilization of O/W...
Highly efficient and reusable photocatalysts that enable photodegradation of pollutants under visible light is the key in waste water treatment with impacts on environment and sustainable development. In this article, we report the preparation and application of a novel core–shell photocatalyst of bismuth vanadate@polydopamine (BiVO4@PDA). The optical absorption property and microstructure of the...
The development of metal-free photoinduced electron transfer-atom transfer radical polymerization (PET-ATRP) in Pickering emulsion by cellulose nanocrystals (CNCs) has successfully investigated. In the presence of ethyl 2-bromoisobutyrate (initiator) and triethylamine (additives), Eosin Y (photocatalyst) can effectively achieve the controllable polymerization of methyl methacrylate utilize CNCs as...
Electrospun nanofibers obtained from cellulose acetate before (CA) and after (DCA) deacetylation were used as electrolyte membranes in dye-sensitized solar cells. As holders of the active components of the device and compared to the reference system, the CA and DCA membranes increased the average device efficiency by as much as 14%. The membranes enhanced the charge transfer at the counter electrode...
The origins of the unique properties of natural fibres have remained largely unresolved because of the complex interrelations between structural hierarchy, chirality and bound water. In this paper, analysis of the melting endotherms for bleached hardwood pulps indicates that the amount of non-freezing bound water (0.21 g/g) is roughly half of the amount of freezing bound water (0.42 g/g). We link...
Predictive models for simulation of drug release from tablets containing lignin as excipient were developed in this work. Two predictive models including Artificial Neural Network (ANN) and hybrid ANN-Kriging were developed to simulate the tablet dissolution. Measured data was collected on the release rate of aspirin tablets prepared by dry granulation via roll compaction followed by milling and tableting...
In this work, nanofibrillated suspensions of bacterial cellulose (BC) were produced via microfluidization. The effects of the size of the openings of the microfluidizer chamber and ultrasonication on the nanofibril properties were evaluated. The results of the X-ray diffraction analysis indicated a considerable reduction in BC crystallinity (86–65%) and crystallite size (5.8–4.0 nm) after microfluidization...
The present study has been carried out to consider the effect of acetylation conditions and type of bleached pulps [Kraft and SO2–ethanol–water (SEW) pulps] on the properties of obtained cellulose acetates (CA) and their films. The acetylation reaction in the absence of solvent was performed by using acetic anhydride and iodine as a catalyst. The efficiency of acetylation and the degree of substitution,...
Protein-modified scaffolds have ability to provide biological functionality due to the similarity in structure of natural extracellular matrix (NECM) in tissues. In this paper, soy protein was selected to modify bacterial cellulose (BC) electrospun nanofiber scaffold prepared by fabricating BC nanofiber via electrospinning followed by ultrasound-induced self-assembly method. The modified nanofiber...
In this study, cotton fabrics were reported to be typically functionalized by loading silver nanowires (AgNW) on the surface of the polydopamine modified cotton fabric. Firstly, AgNW were prepared by a polyol method and then a polydopamine-modified cotton fabric was prepared by being immersed in AgNW dispersion by the dip-coating method. The resulting silver nanowire/polydopamine/cotton-based nanocomposites...
The chemical composition of wood depends on many factors, including plant growth conditions. Among the many dangerous elements it was decided in this study to select arsenic in various forms: As(III), As(V) and cacodylic acid (DMAA), as well as various concentrations and mutual combinations. The experiment was conducted on 1-year old elm seedlings planted in pots with an addition of Knop medium and...
Mixtures of cellulose nanofiber and protein have gained attention as a material having potential application such as bio-plastics and biopolymer based packaging film. Herein, an efficient protocol for the formation of kafirin protein thin film plasticized with PEG-300 and reinforced with 0.5% TEMPO-oxidized CNF was developed. In this regards cellulose nanofibers were prepared using a high-pressure...
The aim of this study was to improve the dispersion of microfibrillated cellulose (MFC) in starch matrix. For this, a kind of urea-modified microfibrillated cellulose (U-MFC) was prepared with microwave-aided method from MFC and urea. The introduction of the carbamate group in MFC was confirmed by Fourier transform infrared spectroscopy and nitrogen content analysis. A better one of the modified fillers,...
We report a green chemical–physical approach for extracting cellulose nanocrystals (CNCs), using a two-step collaborative process combining solvothermal pretreatment and mechanical exfoliation. This method avoids the use of large volumes of sulfuric acid. The structure, morphology, size distribution, zeta potential, crystallinity, and thermal stability of the CNCs are characterized by Fourier-transform...
A novel finishing agent, N,N-dimethyl-octadecyl phosphate acrylamide (NDOPA), was synthesized with octadecanol, phosphorous acid, formaldehyde and acrylamide, and applied to cotton fabrics by ultraviolet curing to endow cotton fabrics with superhydrophobicity and flame retardancy. Results showed that NDOPA could be grafted onto cotton fabrics through C–O–C covalent bonds during the ultraviolet curing...
Fabrication of superhydrophobic cotton fabrics commonly suffers from disadvantages such as extensive usage of toxic and expensive fluorinated adhesives, tedious and time-consuming treatment processes, poor durability and compromised mechanical properties. Herein, this work offers a one-step approach for fabricating eco-friendly, fluorine-free, flexible and robust functional cotton fabrics by immersion...
The primary objective of this study was to investigate the synergistic effects of K2CO3 and steam reforming in the gasification process of woody biomass for hydrogen production. The experiment was carried out in a fixed-bed reactor with a continuous feeding system to investigate the effect of steam to biomass (S/B) molar ratio (0–0.4), K2CO3 loading amount (0–10 wt%) and reaction temperature (650–850 °C)...
Cationized fibers and other kinds of chemically modified fibers impart many advantages in papermaking, but unfeasibly long reaction times are necessary to attain acceptable degrees of substitution, due to the low reactivity of bleached kraft pulps. In this work, different aqueous pretreatments were tested in order to activate cellulose towards a 60 min-long etherification with a quaternary ammonium...
A large amount of salt has been used in reactive dyeing of cotton. In this study, the reduction in the amount of salt used in reactive dyeing of cotton fabric after the sericin application by different methods was investigated in detailed. The effects of different cross-links (citric acid and butane tetracarboxylic acid) for the bonding of the sericin to the cotton fabric were also investigated. The...
The effective separation of hemicelluloses and cellulose is the prerequisite for creating high-value products using wood wastes. In this study, a novel process including mechanical pre-beating, microwave-assisted formic acid (MAFA) extraction, and bleaching treatment was developed for producing high-purity cellulose from the pulp fibers of hardwood waste. Most hemicelluloses and lignin were simultaneously...
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.