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Zhang C.,Donghua University | Zhang C.,National Engineering Research Center for Dyeing and Finishing of Textiles | Yan K.,Donghua University | Yan K.,National Engineering Research Center for Dyeing and Finishing of Textiles | And 7 more authors.
Journal of Materials Chemistry B | Year: 2015

In this work we report a fully aqueous and highly efficient method for the encapsulation of enzymes in silica nanocapsules during their formation process. In this approach, enzymes are first enclosed into unilamellar vesicles self-assembled by an amphiphilic precursor polymer - poly(ethylene glycol) substituted hyperbranched polyethoxysiloxane (PEG-PEOS) - in water. After subsequent condensation under basic conditions enzyme-loaded silica nanocapsules are obtained. Due to the significant volume shrinkage during the PEG-PEOS conversion, the encapsulation efficiency is very high, i.e. by adding only 5 wt% PEG-PEOS almost 50% of the enzyme from the solution is encapsulated. As compared with the free enzyme, the protease encapsulated by this means preserves almost 40% of its activity, exhibits significantly enhanced stability against the change of environmental conditions, and can be repeatedly regenerated without a significant activity loss. This journal is © The Royal Society of Chemistry 2015.


Zhang C.,Donghua University | Zhang C.,National Engineering Research Center for Dyeing and Finishing of Textiles | Cao X.,Donghua University | Cao X.,National Engineering Research Center for Dyeing and Finishing of Textiles | And 4 more authors.
Wool Textile Journal | Year: 2014

Applied polymer Eudragit L100 as carrier to immobilizate protease for wool antifelting. Immobilizated protease was analyzed by FTIR and SDS-PAGE. The results showed that immobilizted protease was form via covalent bonding and molecular weight of protease was increased from 4. 1 ∼ 6. 5 kDa to over 45 kDa. The crystal structure of wool treated with immobilizted protease were measured by means of differential scanning calorimetry (DSC). The results revealed that the a-crystallinity was decreased. Meanwhile, we employed scanning electron microscope (SEM) to observe the morphology of treated wool fiber. Compared with the wool fabric treated with protease, the wool fabric treated with immobilizated protease offered remarkable benefits: weight reduction rate reduced by 21.90%, tensile strength increased by 13. 10%, and area shrinkage reduced from the original 25.21% to 0.89%, indicating that wool fiber damage is significantly reduced and excellent antifelting property imparted to the wool.


Su W.,Donghua University | Li R.,National Engineering Research Center for Dyeing and Finishing of Textiles | Xing Y.-J.,Donghua University
Chinese Chemical Letters | Year: 2016

A simple and convenient method, free of template, has been proposed to synthesize hollow carambola-shaped Ag2S microspheres with AgNO3, thiourea (TU), NaCl and diethanolamine as reagents using a microwave-assisted method, at low temperatures of below 100°C. Powder X-ray diffraction (XRD), scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM) were employed to characterize the morphology and composition of those microspheres. The results indicated that the hollow carambola-shaped silver sulfide microspheres (with high purity and homogeneous morphology) were prepared by an Ostwald ripening process. A possible formation mechanism of hollow carambola-shaped Ag2S microspheres was proposed. © 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.


Pang J.-Y.,Donghua University | Tang X.-L.,Donghua University | Tang X.-L.,National Engineering Research Center for Dyeing and Finishing of Textiles | Shao M.,Donghua University | And 3 more authors.
Asian Journal of Chemistry | Year: 2014

A self-made atmospheric pressure plasma jet reactor on intermediate frequency is presented in this paper. The working gas argon went through the quartz tube and the plasma was generated from a nozzle at atmospheric pressure. The active species generated in the plasma were investigated by optical emission spectroscopy. Through the analysis of the emission spectrum in a series of experiments, it is confirmed the existence of some free radicals, by analysis of the relative strength of active species and the possible dissociation process. There exist large differences in the activity species of plasma between in air environment and in the quartz tube and nitrogen is the most important factor. The experimental results indicate that spectral diagnosis has been proved a workable method and optical emission spectroscopy diagnosis is significant for the research of chemical principle in plasma. Thus, it is important to the application in plasma polymerization and material modification. © 2014, Chemical Publishing Co. All rights reserved.


Huang W.,Donghua University | Song Y.,National Engineering Research Center for Dyeing and Finishing of Textiles | Xing Y.,Donghua University | Dai J.,Donghua University
Industrial and Engineering Chemistry Research | Year: 2010

Nine polycarboxylic acids (PAs) were employed in silica sol to offer an alternative approach in improving washing durability of the hydrophobic cellulose fabric by the sol-gel method. Polycarboxylic acids played a twofold role since they work not only as catalysts in hydrolyzing silica precursor but more importantly as cross-linkers to bind silica coating to cellulose substrate. Washing durability of hydrophobic cellulose fabric finished by the sol-gel method was obviously enhanced. The polycarboxylic acid with the proper number of carboxylic acid groups and distance between the terminal carboxylic acid groups could enhance the washing durability of the hydrophobicity of the cotton fabric by the sol-gel method. 1,2,3,4-Butanetetracarboxylic acid (BTCA) led to the best durability of hydrophobic cellulose fabric with a water contact angle of 138.6̊ (recovery percentage 96.5%) after washing 30 times. The effect of BTCA on durability was also characterized by scanning electron microscopy (SEM). This study suggested that the organic-inorganic sol-gel hybrid using PA as a catalyst is appropriate for achieving a durable hydrophobic cellulose fabric. © 2010 American Chemical Society.


Liu Y.,Donghua University | Li R.,National Engineering Research Center for Dyeing and Finishing of Textiles | Xing Y.,Donghua University
Heterocycles | Year: 2015

An efficient and simple Knoevenagel condensation catalyzed by hydroxy-functionalized ionic liquids proceeded smoothly in high yields under ambient and solvent-free conditions. The condensation procedures of aryl aldehydes and 2,4-thiazolidinedione was involved in hydrogen bonding interactions between the hydroxy groups of the ILs and the carbonyl group of the aldehyde. The ionic liquids can be reused for five times without significant loss in activity.

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