The biocompatible microcapsule of carboxymethyl cellulose/chitosan is obtained through two steps: firstly, carboxymethyl cellulose (CMC) and chitosan (CS) layer-by-layer self-assemble onto melamine formaldehyde (MF) microspheres; secondly, MF template is removed. The electrostatic interaction between CMC and CS, solution ionic strength and growth of LbL membrane are investigated by IR spectra and UV-vis spectra. The morphology and size of hollow microcapsules is observed by SEM and TEM. The results show that the hollow microcapsules are spherical shape with a little distortion and the shell average thickness of one bilayer of CMC/chitosan polyelectrolyte complex was 25 nm. The result for drug delivery and release experiments, tetracycline is as the drug model, shows that tetracycline is encapsulated with a high drug loading efficiency and could be sustained release.
Cellulose acetate (CA), a hydrophilic membrane material, was selected to prepare ultrafiltration membrane for the aim of achieving high-performance membranes with respect to flux and rejection characteristics. In order to prepare membranes with improved properties, blending of cellulose acetates with different degrees of substititution(DS) has been attempted. In this study, polymeric blend ultrafiltration membranes based on cellulose acetate with different DS were prepared by phase inversion technique. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle are used to understand the influence of DS on the properties of modified membranes. The blend membranes prepared were subjected to the separation of egg albumin (EA). The separation and permeate flux efficiencies of the blend membranes were discussed.
LiFePO4 was spinning with cellulose derivatives by electrostatic spinning for the first time. Processing conditions were adjusted to the solution concentration of 15%, an applied voltage of 25KV, the quality of mixed solvent with 4:1, and then about 0.1μm nano-fibrous non-woven fabrics can be obtained. FTIR showed that the CMCAB was synthesized successfully. Coulomb efficiency of electrode materials before and after the modification was maintained at about 100%, specific capacity of the battery in 2C of discharge rate, it was the first time that discharge specific capacity had increased from the unmodified 147.6 mAh.g-1 to the modified 160.6 mAh.g-1Superscript text. After 200 weeks' cycle, the capacity loss decreased from 11.38% to 5.11%.
The composite nanofibers of Aluminum nanoparticles (AlNPs) and carboxymethyl cellulose nitrate (CMCN) have been successfully fabricated by electro-spinning, the fibers combined good mechanical properties of the fibers and high burning rates of AlNPs have valuable applications in the propellant. TEM images showed that AlNPs distributed evenly into the composite nanofibers. The morphology and diameters of AlNPs/CMCN nanofibers were strongly influenced by the solution concentrations and electrostatic field strength. By optimizing the solution concentrations and electro-static field strength, the smooth AlNPs/CMCN nanofibers were prepared.
In this paper, two types of carboxymethyl cellulose samples (CMCe and CMCm), which served as stabilizer to improve the taste and the shelf life of milk beverage, were prepared at different bath ratio and reaction media system. The influencing factors of samples’ discrepancy structure with the ways of preparation were invested. After this, its application basic properties of the samples were searched in milk beverage. The macromolecule structure and morphologies and application performances were analyzed by NMR and SEM. The effect of molecular structures and their acid salt tolerance property of two CMC on milk beverage such as sedimentation ratio and stability of milk micelle were also investigated. The results showed that the distribution of the CH2COO- group on anhydroglucose unit (AGU) of CMCe obtained at low bath ratio in ethanol was C2> C6> C3, whereas C6>C2>C3 which showed the highest substitution in C6 position, was observed in CMCm prepared in mixed isopropanol and ethanol at high bath ratio. In comparison with CMCe at same viscosity, the CMCm showed higher ratio of acidity to viscosity (AVR), higher temperature resistance, lower precipitation ratio (AVR) and better stability. As shown in SEM image of treated milk powder made from milk beverager, the structure of milk protein with CMCm formed continuous network and homogeneous morphology. However the structure of milk protein with CMCe showed tendency of aggregation.
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