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Nanocrystalline cellulose (NCC) is a promising nanofiller for reinforcing chitosan (CTS) film. The flocculation of the NCC suspension in acidic CTS solution is the key problem that makes many properties such as the tensile strength bad. A derivative of nanocellulose, namely cationic dialdehyde cellulose (CDAC), is synthesized in the current study to avoid the flocculation. A CDAC suspension is prepared...
Chitosan and its water-soluble N,N,N-trimethyl derivative were attached to cellulose fibers in the form of nanoparticle dispersions. The attachment of the chitosan nanoparticles to the fiber surface was studied by evaluation of the quantity of chitosan amino groups using a conventional spectrophotometric method supported by X-ray photoelectron spectroscopy. The desorption kinetics of the chitosan...
The inhibiting ability of chitosan alone and in combination with KI for St37 steel in 15% H2SO4 solution has been studied using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), dynamic electrochemical impedance spectroscopy(DEIS), and weight loss (WL) complemented by surface morphological examination with the aid of scanning electron microscopy (SEM) and energy dispersive...
We successfully prepared three-dimensionally interconnected macroporous imprinted chitosan films (3DIM-IFs) by template-assisted assembly. Imprinted chitosan films exhibiting an interconnected macroporous structure are used as adsorbents for efficient and selective adsorption of gadolinium ions (Gd(III)). Saturation adsorption capacity of 3DIM-IFs for Gd(III) is up to 51.36 mg g−1 at 298 K, which...
In this communication, we introduce a chitosan polymer gel ionic actuator with dilute acid as electrolyte solution replacing ionic liquid. Interestingly, the switch not only produces obvious improvements in actuation performance, but the actuator bends towards the opposite direction. It presents a cathode deflection phenomenon instead of the usual anode deflection. Moreover, ion channels inside the...
A new derivative of chitosan was prepared via a chemical modification process which included chemical bonding of chitosan with d-penicillamine and anchoring of Pd(II) to the chitosan-d-penicillamine. Chitosan-modified Pd(II)-d-penicillamine was characterized by FT-IR, CHNS analysis, flame absorption atomic spectroscopy, energy dispersive X-ray spectroscopy, X-ray diffraction pattern and thermal gravimetric...
This study proposes, verifies, and refines the use of biopolymers treated with two new ionic liquids (ILs) (sec-butylammonium acetate and n-octylammonium acetate), as a platform for chromium adsorption. The ILs were synthesized, characterized, and applied to chitosan treatment. Analyzing the size distribution of microparticles of chitosan and chitosan activated with ILs (sec-butylammonium acetate...
Cellulose/chitosan composites were successfully prepared in a new and basic-based solvent system, ethylene diamine/potassium thiocyanate (EDA/KSCN), by dissolving cellulose and chitosan in 70/30 (w/w) EDA/KSCN at −19 °C, and then coagulating in methanol. Wide angle X-ray diffraction studies revealed that the EDA/KSCN solvent system is capable of disrupting the hydrogen bonds in both cellulose and...
Cellulose nanofibers (CNF) have increasing relevance in different applications, for instance, in the paper industry as a sustainable strength additive. This application is especially beneficial for recycled paper, which reaches higher product quality despite its limitations. CNF change paper properties and also can affect the production process, especially the drainage stage, in which retention additives...
Chitosan/poly(ethylene oxide) (PEO) (5:1) nanofibers with cellulose nanocrystals (CNCs) were produced using an electrospinning technique. The addition of CNCs to the chitosan/PEO solutions allowed the production of uniform fibers (without beads) with a high proportion of chitosan. The fiber diameters were influenced by the concentration of CNCs in the chitosan/PEO solutions. The solutions containing...
Natural biopolymer chitosan organic compound (COC) has been used as a copper corrosion inhibitor in molar hydrochloric medium. This study was conducted by weight loss, polarization curves and electrochemical impedance spectroscopy measurements. Scanning electron microscopy, energy dispersive X-ray spectrometry and atomic force microscopy studies were used to characterize the surface of uninhibited...
Pyromellitic dianhydride-modified nanoporous magnetic cellulose–chitosan microspheres (PNMCMs) were designed and synthesized to introduce abundant carboxyl groups onto the basic microstructure. The novel microspheres were studied by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, thermogravimetric analysis (TGA), and X-ray photoelectron...
Crosslinked cellulose-chitosan beads were obtained via dissolution-regeneration of cellulose and chitosan by a LiOH/urea aqueous solution, followed by the crosslinking of chitosan via dialdehyde cellulose (DAC). This crosslinking reaction involved the Schiff base formation between the aldehyde groups of DAC and the amino groups of chitosan and subsequent reduction. DAC was prepared through periodate...
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