A new biodegradable nanocomposite was obtained from layer-by-layer (LBL) technique using highly deacetylated chitosan and eucalyptus wood cellulose nanowhiskers (CNWs). Hydrogen bonds electrostatic interactions between the negatively charged sulfate groups on whisker surface ammonium of were driving forces for growth multilayered films. The film followed by UV−vis spectroscopy through maximum value absorption band at 194 nm showed deposition 14.7 mg·m−2 polymer in each cycle. Scanning...

Bio-based nanocomposites were obtained through covalent linkage between cellulose nanocrystals (CNCs) and the natural polymer chitosan (CH). The CNCs first functionalized with methyl adipoyl chloride (MAC) reactive end groups on surface of reacted amino CH biopolymer in an aqueous medium. resulting characterized using FTIR, TEM, XRD, elemental analyses. Characterization showed that up to 8% hydroxyl substituted by MAC residue. was confirmed FTIR spectroscopy. demonstrated a significant...

Cellulose at the nanoparticle scale has been studied as a reinforcement for biodegradable matrices to improve film properties. The goal investigate properties of starch/gelatin/cellulose nanocrystals (CNC) films. Eleven treatments were considered using RCCD (rotatable central composite design), in addition four control treatments. For each assay, following dependent variables measured: water vapor permeability (WVP), thickness, opacity and mechanical microstructure thermal films also...

Hydrogels have been studied as promising materials in different biomedical applications such cell culture tissue engineering or wound healing. In this work, we synthesized nanocellulose-alginate hydrogels containing cellulose nanocrystals, TEMPO-oxidized nanocrystals (CNCTs), nanofibers (CNFTs). The were freeze-dried and named gels. nanocelluloses the gels characterized by techniques Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission (TEM),...

Abstract: Bionanocomposites films of cassava starch plasticized with sucrose and inverted sugar reinforced by cellulose nanocrystals (CNCs) were prepared solution casting method incorporating 0.1 to 5 wt% eucalyptus CNCs. The characterized using transmission electron microscopy, whereas the bionanocomposites properties studied Fourier transform infrared spectroscopy, tensile measurements, water solubility, swelling behavior, activity ( a w ). resistance (solubility behavior) nanocomposites...

Abstract Bionanocomposites based on polyhydroxybutyrate (PHB) and cellulose nanowhiskers (CNWs) were prepared by dispersing CNWs in poly(ethylene glycol) (PEG) plasticizer subsequently incorporating the CNWs/PEG suspensions matrix. The thermal properties of nanocomposites indicate an enlargement processing window comparison to neat PHB. showed a remarkable increase strain level (50 times related PHB), without significant loss tensile strength with incorporation small concentrations final...

ABSTRACT Electrospun nanocomposites of poly(ε‐caprolactone) (PCL) incorporated with PCL‐grafted cellulose nanocrystals (PCL ‐g‐ CNC) were produced. PCL chains grafted from (CNC) surface by ring‐opening polymerization. Grafting was confirmed infrared spectroscopy (FTIR) and thermogravimetric analyses (TGA). The resulting CNC then into a matrix at various loadings. Homogeneous nanofibers average diameter decreasing the addition observed scanning electron microscopy (SEM). domains visualized...

ABSTRACT About 85–90% of the market for new materials in biodegradable packaging is served by various blends and composites containing starch some portion. In an attempt to satisfy increasing consumer demand, innovative are being developed. This includes concept active packaging, which, addition protecting, interacts with packaged product. this context, flexible films have been prepared from poly(butylene adipate‐co‐terephthalate), thermoplastic (TPS), cellulose nanowhiskers (CNW) at...

Layer-by-layer (LBL) assembly was used to combine crystalline rod-like nanoparticles obtained from a vegetable source, cellulose nanowhiskers (CNWs), with collagen, the main component of skin and connective tissue found exclusively in animals. The film growth multilayered collagen/CNW monitored by UV-Vis spectroscopy ellipsometry measurements, whereas morphology surface roughness were characterized SEM AFM. spectra showed deposition same amount 5 mg m−2, each dipping cycle. Ellipsometry data...

Interactions between uncharged polymers and cationic surfactants are considered weaker than interactions with the anionic analogues. This work describes binding occurring methylcellulose (MC) surfactant DTAB in aqueous medium. In absence of salt, MC–DTAB exhibits a maximum hydrodynamic radius, Rh,slow, increase concentration. Otherwise, presence salt system shows only linear Rh,slow. CAC is lower CMC, which taken as an evidence neutral polymer that induces aggregation process. Static light...

Chitosan solutions and cellulose nanocrystal suspensions were used to produce highly stable aqueous dispersions of multi-walled carbon nanotubes (MWCNTs). The different MWCNT dispersions, presenting positive negative charges, prepare multilayered hybrid thin films through electrostatic layer-by-layer (LBL) self-assembly. MWCNTs are well dispersed homogeneously distributed on each layer chitosan nanocrystals the films. densely packed in multilayer, forming a random network. surface LBL film...

Biosorption of Pb2+ ions from aqueous solution onto Luffa cylindrica sponge as adsorbent (LCSA) was investigated in batch adsorption system. LCSA characterized by X-ray diffraction analysis technique (XRD), Scanning Electron Microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), Fourier Transform Infrared spectrometer (FTIR), particle size dispersion, zeta potential, thermogravimetric (TGA), and Brunauer-Emmett-Teller (BET) surface area analyzer. The sorption subjected to...

Nitrilotriacetic acid functionalized Adansonia digitata (NFAD) biosorbent has been synthesized using a simple and novel method. NFAD was characterized by X-ray Diffraction analysis technique (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analyzer, Fourier Transform Infrared spectrometer (FTIR), particle size dispersion, zeta potential, elemental (CHNS/O analyzer), thermogravimetric (TGA), differential thermal (DTA), derivative (DTG) energy dispersive...