Novel biobased materials from fungal hyphae and cellulose fibers have been proposed to address the increasing demand for natural in personal protective equipment (PPE). Materials containing commercially available kraft (KF), laboratory-made highly fibrillated hemp (HF) (FF) obtained fruiting bodies of lignicolous basidiomycetes growing nature were prepared using paper production techniques evaluated their mechanical air permeability properties. SEM microscopy revealed network structure...

New insight on the conversion of amorphous calcium phosphate (ACP) to nano-sized alpha tricalcium (α-TCP) provides a faster pathway bone cements. In this work, synthesized ACP powders were treated with either water or ethanol, dried, crystallized between 700 and 800 °C, then cooled at different cooling rates. Particle size was measured in scanning electron microscope, but crystallite calculated by Rietveld analysis. Phase composition bonding powder assessed x-ray diffraction...

Cellulose nanocrystals (CNCs) have generated increasing attention in the past few years as potential sources of innovative bionanomaterials. This study focuses on an alternative method nanocellulose particle preparation, using ammonium persulfate, and compares this to existing techniques. Nanoparticles were prepared 4 different methods: thermocatalytic method, TEMPO oxidation, acid hydrolysis oxidation with persulfate. With persulfate grinding time oxidised cellulose is reduced drastically...

Abstract Bleached birch kraft pulp (BKP, Södra Cell AB, Sweden) and unmodified bacterial cellulose (BC) pellicles, biosynthesized by the bacterium Komagataeibacter rhaeticus , were converted to nanofibers via ammonium persulfate (APS) oxidation. Fiber dimensions investigated in an atomic force microscope, crystallite size was calculated Rietveld analysis. Saos-2 osteosarcoma cell line served assess vitro cytocompatibility of biocomposite films. Results showed that individual with average...

This work is focused on the phase transformation from amorphous calcium phosphate (ACP) to nanostructured hydroxyapatite (HA) or tricalcium (TCP). Amorphous phosphates with Ca/P molar ratio near 1.67 and 1.5 were synthesized by wet-chemical precipitation method treated ethanol. Upon thermal treatment, ACP clusters about 50 nm create a HA TCP. The highlights of this research: precipitate treatment ethanol provided pure α-TCP that was found be stable up 1000 °C. obtained precursor using also...

Wood-based nanoparticles fabricated by different optimized methods – acid hydrolysis, thermocatalytic destruction and TEMPO catalysed oxidation show the potential to improve physical-mechanical biological properties of polymer-matrix biocomposites. In this work, influence obtained on chitosan-matrix biocomposite was investigated. The results showed that wood-based are promising constituents

In this work properties of potential brushite (CaHPO4•2H2O) and hydroxyapatite (Ca10(PO4)6(OH)2) compound cements are investigated. Calcium dihydrogenphosphate monohydrate (MCPM) α-tricalcium phosphate (α-TCP) were the starting materials for investigated cements. Setting time is controlled by adding setting retarder – citrate ions initially unreactive filler - monetite (CaHPO4). Some compositions obtained contain both hydroxyapatite. However a substantial amount was present even if it not...

In this work, unmodified bacterial cellulose pellicles, biosynthesized by the bacterium Komagataeibacter rhaeticus, bleached birch Kraft pulp (Södra Cell AB, Sweden) and bark supplied plywood industry (JSC Latvijas Finieris, Latvia), were used to obtain nanoparticles. The results showed that nanoparticles fabricated ammonium persulfate oxidation method, an alternative method developed at Latvian State Institute of Wood Chemistry, are promising constituents for producing nanopaper. Cellulose...

Nano-sized pure α-tricalcium phosphate (α-TCP) fabricated by a novel synthesis approach shows great potential for faster transformation into calcium-deficient hydroxyapatite (CDHA) than conventionally prepared α-TCP. In this work, amorphous tricalcium precursors were precipitated and treated with solvent (water or ethanol), dried (freeze-dried oven-dried) before heating at 775 °C. Nanosized α-TCP powders investigated their phase composition crystallinity, particle shape size, reactivity...

For reinforcing of paper, nanoparticle gels from black alder, birch and pine bark were obtained. Non-extracted that extracted in biorefinery used. producing nanoparticles, the materials destructed using thermocatalytic destruction method then dispersed water medium a ball mill. At sufficient concentration, gel-like dispersions obtained, which contained nanoparticles with size ~300 nm. The effect on properties paper sheets was investigated by introducing dissolved furnish covering both sides...

In this work, unmodified bacterial cellulose pellicles, biosynthesized by the bacterium Komagataeibacter rhaeticus, bleached birch Kraft pulp (Södra Cell AB, Sweden) and bark supplied plywood industry (JSC Latvijas Finieris, Latvia), were used to obtain nanoparticles. The results showed that nanoparticles fabricated ammonium persulfate oxidation method, an alternative method developed at Latvian State Institute of Wood Chemistry, are promising constituents for producing nanopaper. Cellulose...