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Hybrid inorganic–organic treatments, based on amide-amine polymers (PAAs), against thermal oxidation have been prepared on paper dating back to eighteenth century. The polymeric sols are obtained by step-growth Michael addition polymerization and functionalized with siloxane network by sol–gel method. Five types of samples have been prepared changing the molar ratios among the reagents and their concentration...
We report a ‘one-pot’ synthetic approach for TEMPO (2,2,6,6-tetramethyl-piperidin-1-oxyl) oxidized cellulose nanofibrils (TOCN) surface amidation by coupling up to 70% of superficial carboxylic units in TOCN with long alkyl chain primary amines (dodecylamine and octadecylamine) using TBTU [O-(1H-benzotriazol-1-yl)-N,N,N’,N’-tetramethyluronium tetrafluoroborate] uronium salt as coupling agent. Raw...
In the present study, cellulose-lignin beads were prepared using pretreated dissolving grade-pulp and extracted from birch wood hydrotropic lignin as starting materials. The preparation involved dissolution of both polymers in environmentally friendly 7% NaOH/12% urea aqueous solution, shaping the solution into beads and subsequent regeneration. Lignin content in the beads varied from 0 to 40%. The...
Nano zinc oxide (ZnO) was applied on bleached jute fabric to impart fire retardant finish. Nano zinc oxide was prepared from aqueous Zinc acetate by co-precipitation method in the presence of NaOH followed by calcination at 600 °C. It was then applied on the jute fabric using an aqueous solution of Potassium Methyl Siliconate as dispersing media by pad-dry method. Among different dosages of nano ZnO...
In this study, chitosan–metal oxide composites (CS–MO) were prepared for graphene oxide (GO) removal from aqueous solutions. The results showed that the GO coagulation on CS–MO was dependent on pH and ionic strength. The maximum GO removal capacities reached 442.5 mg/g on CS–Al2O3, 425.0 mg/g on CS–ZnO and 421.2 mg/g on CS–MgO, respectively, showing a huge advantage in the efficient elimination of...
Cellulose hydrogel, fabricated from cellulose solution in an LiOH/urea aqueous system at low temperature, was successfully applied for in situ synthesis of Fe2O3 nanoparticles to obtain hybrid magnetic nanomaterials. The microporous structure of cellulose hydrogel at wet state provided reaction chambers to synthesize the Fe2O3 nanoparticles. The structure and properties of the magnetic cellulose/Fe...
Water-based spinning dopes composed of enzymatically fibrillated pulp (EFP), poly(vinyl alcohol) and glutaraldehyde crosslinker were successfully spun into monofilaments. Specimens containing EFP concentrations of 50 and 60 wt% were obtained utilising a customised spinning system based on a syringe pump. Monofilaments exhibited high stiffness, good strength and low strain; maximum tensile values were...
This study discusses the possibility of in situ photoreduction of Ag+-ions on the surface of titania nanotubes (TNTs) deposited on the cotton and cotton/PET fabrics in the presence of amino acid alanine and methyl alcohol. TNTs were synthetized by hydrothermal method. The proposed interaction between titania, alanine and Ag+-ions was based on the results obtained by FTIR measurements. In order to...
In this study, flax fibers were oxidized in order to improve the interfacial adhesion of cellulosic fibrils to a TiO2 coating. The TiO2 coating was created on the flax fiber by a Sol–Gel dip-coating technique. The effect of cellulose oxidation and the consequent TiO2 grafting was studied on cellulose crystalline structures using X-ray diffraction. X-ray photoelectron spectroscopy was used to compare...
Wastewater has long been a highly important insurmountable problem in the textile industry. Since the rapid development of antimicrobial silver nanoparticle (AgNP)-coated textiles in the recent several decades, AgNP-containing wastewater produced in the finishing process has gradually posed a greater threat to the ecological environment than that by traditional organic dyes because of the former’s...
Aqueous nanogels are notoriously difficult to dewater. An example of such a gel is that of a suspension of micro nanofibrillated cellulose, in which water is both bound to the fibrillar surface and held within the interfibril matrix. We demonstrate a phenomenon in which dewatering of nanocellulose based gel-like suspensions can be induced by adding a colloidal particulate component, which itself can...
The grafting of arginine and glutamic acid on cellulose (through an intermediary step of chlorination) allows improving uranyl sorption of the biopolymer. The sorbents (Arg-Cell and Glu-Cell) were characterized by elemental analysis, FTIR spectrometry, XRD, SEM-EDX analysis and TGA. The sorption efficiency increases with pH; this can be attributed to the deprotonation of carboxylic acid and amine...
This study investigated cellulose production and microstructure variation from six Komagataeibacter strains (ATCC 53524, ATCC 10245, ATCC 23769, ATCC 700178, NBRC 13693 and KTH 5655). Strain KTH 5655 produced the highest cellulose yields (10.39 g/l) after 9 days cultivation. Nuclear magnetic resonance spectroscopy and X-ray diffraction revealed that strain ATCC 23769 synthesised cellulose with the...
The thermal degradations of small samples of different used cotton fabrics and of cellulose, in comparison, in a thermogravimetric balance are considered under non-oxidative (100% N $$_{2}$$ 2 ) or oxidative (20% O $$_{2}$$ 2 , 80% N $$_{2}$$ 2 ) atmospheres and for different temperature ramps (5–50 K min $$^{-1}$$ - 1 ). The associated kinetic parameters...
Studies of cellulose aging and yellowing that involved a 1,4-dimethyl 3-keto β-d-glucoside (compound 1) model of oxidized cellulose led to a hemi-hydrated crystal of title compound 2 (1,6-dihydroxy-3,8-bis-hydoxymethyl-5,10-dimethoxy-4,9-dioxa-tricyclo [5,3,1,1,2,6] dodecane-11,12-dione). The same compound 2 was isolated in low yield from “real-world” oxidized and aged cellulosic pulp. Formation of...
Interest in nanocellulose-based coatings for packaging applications has been growing due to their excellent oil and gas barrier properties combined with their sustainable, recyclable, biodegradable, and non-toxic nature. Coating of nanocellulose materials such as microfibrillated cellulose (MFC) on paper/paperboard is challenging compared to traditional paper coating materials due to excessively high...
The agglomeration of cellulosic materials upon drying, often called hornification, causes a reduction of water retention, among other undesired effects. It is one of the main issues in industrial cellulose processing, especially with regard to nanocelluloses. As a consequence, high transportation and storage costs arise since nanocelluloses need to remain in aqueous suspensions unless trade-offs in...
Nanocellulose is a lightweight material with strong mechanical strength, inexpensive production costs and safe handling compared to synthetic nanoparticles. Thanks to the high specific surface area, broad possibility of surface modification and high mechanical strength, nanocellulose has emerged as a new class of biobased adsorbent with promising potential application in environmental remediation...
The impact of the size of the charged group on the properties of alkoxylated NFC was studied by two chloroalkyl acid reagents. It was found that the employment of the larger 2-chloropropionic acid reagent leads to improved properties, e.g. higher fraction of nano-sized materials, and significantly better redispersion as compared to when the smaller monochloroacetic acid was employed. The differences...
In this work, we prepared phosphorylated pulp with a phosphorous content of 1.23 mmol/g by adding an aqueous solution of NH4H2PO4 and urea to softwood pulp sheets followed by drying and curing with hot air and obtained cellulose nanofibers (CNFs) with a uniform width of 3–4 nm in approximately 100% gravimetric yield by high-pressure homogenization of the phosphorylated pulp slurry. After phosphorylation,...
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