Abstract Hydrogels based on biopolymers like Gum Arabic (GA) usually show low applicability due to weak mechanical properties. To overcome this issue, (nano)fillers are utilized as reinforcing agents. Here, GA hydrogels were reinforced by chitin nanowhiskers (CtNWs, aspect ratio of 14) isolated from the biopolymer chitin through acid hydrolysis. Firstly, GA was chemically modified with glycidyl methacrylate (GMA), which allowed its crosslinking by free radical reactions. Next, hydrogel samples containing different concentrations of CtNWs (0–10 wt%) were prepared and fully characterized. Mechanical characterization revealed that 10 wt% of CtNWs promoted an increase of 44% in the Young's modulus and 96% the rupture force values compared to the pristine hydrogel. Overall, all nanocomposites were stiffer and more resistant to elastic deformation. Due to this feature, the swelling capacity of the nanocomposites decreased. GA hydrogel without CtNWs exhibited a swelling degree of 975%, whereas nanocomposites containing CtNWs exhibited swelling degrees under 725%.
Abstract Gelatin based hydrogels were synthesized by the thawing-freezing method employing gum Arabic as crosslinking agent. The incorporation of cellulose nanowhiskers (NC) was analyzed aiming to reach a control over the solubility/degradation rate, swelling properties and their ability to load anaesthetic drugs. Three concentrations of NC were explored, i.e: 1, 2 and 5%w/w with respect to the gelatin mass. The raw and NC containing hydrogels were well characterized in terms of the main propert...
#2André R. Fajardo(UFPEL: Universidade Federal de Pelotas)H-Index: 29
Last. You-Lo Hsieh(UC Davis: University of California, Davis)H-Index: 59
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Abstract Physical adsorption has shown to be facile and highly effective to deposit chitosan nanowhiskers (CsNWs, 60 % deacetylated, length: 247 nm, thickness: 4–12 nm, width:15 nm) on electrospun cellulose acetate nanofibers (CANFs, 560 nm) to effect complete surface charge reversal from negatively charged CANFs (−40 mV) to positively charged CsNWs-adsorbed CANFs (+8 mV). The CsNWs coverage did not alter the smooth and homogeneous morphology of fibers, as observed from SEM images. Biological as...
#1Shi-Neng Li(HIT: Harbin Institute of Technology)H-Index: 9
#2Baoqiang Li(HIT: Harbin Institute of Technology)H-Index: 3
Last. Long-Cheng Tang(Hangzhou Normal University)H-Index: 34
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Abstract Hydrogels with exceptional mechanical properties at high water content are crucial need for practical applications in various fields. However, achieving a hydrogel possessed splendid mechanical performance with well trade-off between tensile strength and toughness is highly demanded due to the mechanical weakness of conventional hydrogel. Herein, we report a novel kind of nanocomposite hydrogel developed by integrating chitosan decorated halloysite nanotubes (CS-f-HNTs) into dual cross-...
Last. Ming Kong(Ocean University of China)H-Index: 27
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Abstract Schiff base reaction crosslinking hydrogels are advantageous by rapid formation and absence of external crosslinkers. However, poor mechanical hindered their broader applications. Here, a mechanically strengthened tissue adhesive was constructed through incorporation of chitin nano-whiskers (CtNWs) with a Schiff base crosslinking hydrogel of carboxymethyl chitosan (CMCS) and dextran dialdehyde (DDA). The optimal formulation of complexed hydrogel exhibited 1.87 folds higher compressive s...
Last. Mingxian Liu(JNU: Jinan University)H-Index: 37
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Superamphiphobic coating has significant applications in self-cleaning and anti-fouling materials. Herein, chitin nanocrystals (ChNCs) with a needle-like morphology as building blocks were modified...
Last. Sultan Alam(University of Malakand)H-Index: 6
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The TiO2 dispersed physically cross-linked polymer hydrogels were synthesized through a single step free radical addition polymerization mechanism based on acrylic acid and gum Arabic (GA) as polymer constituents, and ferric ions (Fe3+) as physical cross-linker. The effect of TiO2 powder was investigated on thermal and mechanical properties of the hydrogels by dispersion of 0.01, 0.02 and 0.03 g of TiO2 in hydrogels. The prepared hydrogels were successfully characterized through FTIR, XRD, SEM a...
Last. Mingyue Piao(Jilin Normal University)H-Index: 3
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Due to the wonderful property of hydrogels, they can provide a platform for a wide range of applications. Recently, there is a growing research interest in the development of potential hydrogel adsorbents in wastewater treatment due to their adsorption ability toward aqueous pollutants. It is important to prepare such a hydrogel that possesses appropriate robustness, adsorption capacity, and adsorption efficiency to meet the need of water treatment. In order to improve the property of hydrogels,...
Abstract This paper reports the synthesis of a superabsorbent hybrid based on Arabic gum (AG) and a cross-linkable inorganic material for water dye absorption with enhanced mechanical properties. The inorganic material (MOF-UIO-66) was modified with acrylic acid (AA) using solvent-assisted ligand incorporation for further chemical hydrogelation with AG. This approach leads to a stable structure whose constituent phases are covalently bonded to each other. The mechanical properties and swelling d...
Abstract Arabic gum-based composite hydrogels reinforced with eucalyptus and pinus residues were synthesized via free-radical reaction aiming to controlled phosphorus release. All hydrogels were characterized by swelling kinetics (SK), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-Ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and mechanical assays (MA). The water and solute transports through the hydroph...
Last. Sharif Ahmad(Jamia Millia Islamia)H-Index: 50
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The chemically oxidized gum arabic was prepared and used as a naturally derived nontoxic and pH-responsive cross-linker to develop smart polyvinyl alcohol (PVA)-based hydrogels for the first time. The formulated hydrogels exhibited high mechanical properties, good porosity, and pH sensitivity, which facilitated their application as promising biomaterials for sustained delivery of folic acid. Further, the synthesized cross-linked PVA hydrogels displayed no cytotoxicity toward the human embryonic ...