Frazierwilkinson0541

Nano cellulose has attracted more attentions as promising stabilizer candidate for Pickering emulsions due to its renewable and biocompatible properties. In this work, spherical cellulose nanocrystals (S-CNCs) (diameter 30-60 nm) were prepared by mixed acid hydrolysis of mercerized microcrystalline cellulose under the treatment of ultrasonic. We characterized the Pickering emulsions stabilized by various S-CNCs concentration in the aqueous phase and visualized their distribution in emulsions system. The diameter of emulsion droplets has no increase after 7 days storage. The emulsions present ultra-low viscosity even at a high S-CNCs concentration in the aqueous phase (5 g/L). Furthermore, noting that Pickering emulsions droplets stabilized by S-CNCs exhibited high stability even pH, ionic strengths, and temperatures changed in wide range. Thus, the S-CNCs acted as a new stabilizer for Pickering emulsion open opportunities for the development of biomedicine, cosmetics, and food applications.In the current study, we synthesized eugenol (EU) based Pickering emulsion (PE) stabilized by food grade ingredients such as chitosan (CS) and tripolyphosphate (TPP) not only to enhance water miscibility of EU but also to decrease stress and damage to the immune system of fish due to anesthetic procedures. The formulated EUPEs were characterized in terms of droplet size, size distribution and the effects of environmental conditions e.g. pH and temperature on the behavior of the EUPEs. The results showed that EU PEs with 5% EU had smaller size with uniform distribution and were stable in the range of pH 5-7.5 and temperature 30-80 °C. The anesthetic effect of the EUPE was investigated by taking Common carp as a sample species. Interestingly, it was found that the induction time to anesthesia and recovery for the fish that received the PE was significantly shorter than that received EU at the same eugenol concentration (50 ppm). Most importantly, the improved hematological and bio-chemical parameters in the PE group further confirmed the immuno-protective and stress control efficacy of the PE. learn more The results of this study propose a novel useful and potential application of PE in fishery where sedation is needed.Dispersion states are vital for fibrous nanocelluloses to be used as reinforcements for polymers, which is highly dependent on geometry of nanocelluloses. Three types of nanocelluloses with various fiber aspect ratios were used to prepare target composite samples with poly(β-hydroxybutyrate) in this work. Viscoelasticity/elastoplasticity were used as probes to detect the flexibility-morphology relations of nanocelluloses in polymer. Cellulose nanocrystals (aspect ratio = 8) were rigid in polymer, retaining their rod-like shape, whereas bacterial celluloses (aspect ratio = 600) fully flexible, forming closely networked structure, and cellulose nanofibers (aspect ratio = 70) semi-flexible, dispersing as loosely flocculated clusters. Owing to these differences, the viscoelastic flow and elastoplastic deformation of three kinds of composites differed from one another. The strain-scaling and hysteresis work-scaling behaviors were then used to establish relaxation scale-structure correlations of target samples. This work provides interesting information around regulating the dispersion of nanocelluloses in polymer composites by tailoring aspect ratios of nanocelluloses.Dextran hydrogels (Dex-SS) containing both disulfide and Schiff base bonds were developed via facile method based on the dextran oxidation and subsequent formation of Schiff base linkages between polyaldehyde dextran and cystamine, denoted as the disulfide-containing Schiff base reactions. Results of rheology, swelling and 13C CP/MAS NMR study indicated that cross-linking degree of Dex-SS hydrogels depended strongly on the molar ratio of -CHO/-NH2. Acidic and reductive (GSH) environment sensitive degradation behaviors of Dex-SS hydrogels were then evidenced by SEM, rheology study and Ellman's assay. Moreover, doxorubicin (DOX) was loaded into the hydrogel matrix and pH/GSH-responsive release behaviors were demonstrated. Cytocompatibility of Dex-SS hydrogel and effective cell uptake of released DOX was finally proved by transwell assay with HepG2 cells. Take advantages of the abundance of vicinal hydroxyl on a variety of polysaccharides, the disulfide-containing Schiff base reactions is considered as versatile method to develop stimuli-sensitive hydrogels for local drug delivery.Metal organic frameworks (MOFs) have become premium candidates for the removal of hazardous contaminants from wastewater. However, MOFs have a vast obstacle which is their poor recyclability. In this study, ZIF-67 was decorated with magnetic Fe3O4 nanoparticles, and then embedded into aminated chitosan (AmCs) matrix to form core-dual shell Fe3O4/ZIF-67@AmCs composite beads. Diverse analysis tools were utilized to ensure the successful fabrication of the magnetic composite beads. The fabricated magnetic composite beads were examined their adsorptive removal aptitude towards toxic Cr(VI) ions. The gained results refereed that a maximum adsorption capacity of 119.05 mg/g was attained by magnetic Fe3O4/ZIF-67@AmCs composite beads at 25 °C. The process obeyed both of Langmuir and Freundlich isotherm models, and the pseudo 2nd order was more suitable kinetic model to represent the adsorption process. Besides, Fe3O4/ZIF-67@AmCs composite showed an excellent recyclability for the removal of Cr(VI) ions from their aqueous solutions for seven consecutive cycles.The study aims to investigate the hydro-mechanical behaviour of the polysaccharide amended sand-clay mixture and analyse the soil - biopolymer interaction. Parameters like permeability, strength and heavy metal attenuation capacity of the amended soil were characterized and studied particularly for its use in landfill applications. The permeability of the soil was investigated for a period of one year. The results of the investigation show that all the selected polysaccharides significantly reduce the permeability and improve the heavy metal adsorption capacity of the sand-clay mixtures. The biopolymer also contributes to the increase in the strength of the soil. The improved mechanical properties of the amended soil can be ascribed to the bio-clogging through gel plug formation and bonding action of the biopolymers. Xanthan gum amended soil showed the least permeability, highest strength and adsorbed the selected heavy metals almost entirely, showing the best performance as a liner material.