Rui Zhang

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Name: 张蕤; Rui Zhang

Organization: Nanjing Forestry University

Department: College of Chemical Engineering

Title: Professor

TOPICS

Polymer

Polyesters

Chemicals
References

Preparation of bacterial cellulose/graphene nanosheets composite films with enhanced mechanical performances

Co-reporter:Wei Shao, Shuxia Wang, Hui Liu, Jimin Wu, Rui Zhang, Huihua Min, Min Huang

Carbohydrate Polymers 2016 Volume 138() pp:166-171

Publication Date(Web):15 March 2016

DOI:10.1016/j.carbpol.2015.11.033

•Bacterial cellulose (BC)-graphene composite films were successfully prepared.•The addition of graphene decreased the hydrophilic property.•BC-graphene composites exhibited enhanced thermal stability.•The addition of graphene plays important roles in the mechanical improvements.Graphene has been considered to be a promising nanofiller material for building polymeric nanocomposites because it has large specific surface area and unique mechanical property. In the study, BC/graphene composites were prepared by a simple blending method. The resulting structure and thermal stability of the composites were investigated by several techniques including TEM, SEM, XRD, TG and Raman spectrum. These results indicate graphene nanosheets were successfully impregnated and uniformly dispersed in the BC matrix. Water contact angles result showed that the addition of graphene decreased hydrophilic property since water contact angle of BC increased from 51.2° to 84.3° with 4 wt% graphene added. The mechanical performances of BC/graphene composites were highly evaluated. When compared to pristine BC, the incorporation of 4 wt% graphene improved the tensile strength from 96 MPa to 155 MPa and Young's modulus from 369 MPa to 530 MPa, respectively.

Tetracycline hydrochloride loaded regenerated cellulose composite membranes with controlled release and efficient antibacterial performance

Co-reporter:Wei Shao, Shuxia Wang, Xiufeng Liu, Hui Liu, Jimin Wu, Rui Zhang, Huihua Min and Min Huang

RSC Advances 2016 vol. 6(Issue 4) pp:3068-3073

Publication Date(Web):14 Dec 2015

DOI:10.1039/C5RA23409C

Fabrication of cellulose based composites with controlled release and efficient antibacterial performances is of general interest in biomedical areas. In this study, antibiotic drug, tetracycline hydrochloride (TCH), loaded regenerated cellulose (RC) composite membranes were prepared and their drug release, antibacterial activity and biocompatibility were evaluated. The structure and morphology of the formed RC-TCH composite membranes were characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The TCH release results showed that the RC membrane is capable of controlled release. In vitro antibacterial assay demonstrated that the developed RC-TCH composites displayed excellent antibacterial activity, solely associated with the loaded TCH drug. More importantly, the RC-TCH composites displayed good biocompatibility, thus confirming its utility as potential in wound dressings and other medical applications.

Anti-bacterial performances and biocompatibility of bacterial cellulose/graphene oxide composites

Co-reporter:Wei Shao, Hui Liu, Xiufeng Liu, Shuxia Wang and Rui Zhang

RSC Advances 2015 vol. 5(Issue 7) pp:4795-4803

Publication Date(Web):09 Dec 2014

DOI:10.1039/C4RA13057J

In the present work, a novel composite material formed by bacterial cellulose (BC) networks and graphene oxide (GO) nanosheets was synthesized by a sonochemical method. The BC and as-prepared BC/GO composites were characterized by several techniques including Scanning Electron Microscopy (SEM), Fourier-transform infrared (FTIR) spectra, ultraviolet-visible (UV-vis) absorption spectra, thermogravimetric analyses (TG) and X-ray diffraction (XRD). SEM images showed that the morphologies of composites became more compact than BC. FTIR, UV, TG and XRD confirmed the existence of GO in the composites. Moreover, HEK 293 cells were cultivated, and both the biocompatibility of the materials and the cell viability were demonstrated. Meanwhile, the anti-bacterial performances of BC/GO composites were evaluated with Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), which frequently cause medically associated infections. The experimental results showed that the BC/GO composites have excellent anti-bacterial activities, thus confirming its utility as a potential biomaterial in biomedical applications. Furthermore, the anti-bacterial behavior had been well explained by the extended DLVO theory.

Study on the poly(3-hydroxybutyrate-co4-hydroxybutyrate)-based composites toughened by synthesized polyester polyurethane elastomer

Co-reporter:Tianxiang Su;Jianjian Wang;Wei Shao;Yuan Hu

Journal of Applied Polymer Science 2015 Volume 132( Issue 44) pp:

Publication Date(Web):

DOI:10.1002/app.42740

ABSTRACT

In this study, polycaprolactone(PCL)-based polyurethane (PU) elastomer containing 45 wt % hard segment component was synthesized and characterized by fourier transform infrared spectroscopy, gel permeation chromatography, and X-ray diffraction. As a toughening agent, the as-synthesized PU was incorporated into biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3,4)HB] by solution casting to prepare P(3,4)HB/PU composites. The microstructure and properties of P(3,4)HB/PU composites were investigated using transmission electron microscopy, X-ray diffraction, tensile testing, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and activated sludge degradation testing. The results show that PU can disperse well in a P(3,4)HB matrix. The elongation at break of P(3,4)HB/PU composites is remarkably increased while the yield strength and elastic modulus are decreased with an increase in PU content. At the same time, it is found that the fracture characteristic of P(3,4)HB is obviously transformed from brittleness into ductility with a gradual increase in PU loading. Moreover, the thermal stability of P(3,4)HB/PU composites is significantly improved compared with that of pure P(3,4)HB. In addition, the biodegradation rate of P(3,4)HB/PU composites is evidently reduced with the increase of PU content in the activated sludge degradation testing. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42740.