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Li T.,Sun Yat Sen University | Zhang Y.,Guangdong Light Industry Technical College | Song Z.,Guangdong Pharmaceutical University | Wu H.,Guangdong Pharmaceutical University | Li S.,Sun Yat Sen University
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2013

To obtain antibacterial chitosan with improved dynamic mechanic properties, the Ag-MMT was dispersed in chitosan solution dissolving in acetic acid to obtain nano Ag-MMT/CS composite via solution intercalation. The Ag+ ion can be released steady and slowly from Ag-MMT/CS in vitro release test in simulated fluid. The bacterial inhibition zone diameter of Ag-MMT/CS is 9.2 mm, which is 50.6% larger than that of CS, the result shows Ag-MMT/CS's good antibacterial activity against Staphylococcus aureus. And the inhibition ratio test result suggests the significant surface area and adsorption capacities of MMT help a lot to immobilize more bacteria on the surface and improve the antibacterial activity of Ag-MMT/CS. In the dynamic thermomechanical analysis (DMA) test, the storage modulus of Ag-MMT/CS is 3261 MPa, which exhibits remarkable increase (195% larger than CS) in mechanic property.

Li T.,Guangdong Pharmaceutical University | Zhang Y.,Guangdong Light Industry Technical College | Song Z.,Guangdong Pharmaceutical University | Wu H.,Guangdong Pharmaceutical University
Polymer Composites | Year: 2014

Chitosan/Ag-montmorillonite (CS/Ag-MMT) nanocomposite was obtained via solution intercalation. The X-ray diffraction and transmission electron microscopy results indicated the successful formation of intercalated-andexfoliated nanostructures at low Ag-MMT contents and intercalated-and-flocculated nanostructures at high Ag-MMT contents. The CS/Ag-MMT nanocomposite with 7 wt% Ag-MMT presented a very high inhibition ratio against Staphylococcus aureus (>70%), and its bacterial inhibition zone diameter was 3.2 mm larger than that of CS, which showed remarkable antibacterial activity. When the Ag-MMT content was 5 wt%, the E′ of CS/Ag-MMT was increased to 3,261 MPa, which was 195% higher than CS and exhibited excellent mechanic property. The DMA test results showed the Tg of CS/Ag-MMT shifted to a higher temperature, suggesting the Ag-MMT interlayer not only interacted quite strongly with the reactive groups of CS but also restricted the motion of CS macromolecules, which was also verified by Fourier transform infrared spectrum measurements. © 2014 Society of Plastics Engineers.

Tian L.,Guangdong Pharmaceutical University | Yuanyuan Z.,Guangdong Light Industry Technical College | Yingying M.,Guangdong Pharmaceutical University | Ran H.,Guangdong Pharmaceutical University
Applied Clay Science | Year: 2015

The polycarbonate (PC) solution was mixed with silver loaded modified montmorillonite (Ag-Mt) and then treated with 1,4-dimethylbenzene to obtain functional Ag-Mt/PC with superhydrophobicity. The Ag-Mt/PC with the Ag-Mt content of 1.5. wt.% showed a high water CA (152.5°) and excellent durability, the water CA decreased only 10% during a week's continuously water flow at the rate of 0.2. mL/s. The scanning electron microscopy (SEM) and surface area measurement results proved that the crystallization situation was more complicated on the interface of PC and Ag-Mt interlayer, resulted in different phase separation rate, provided more opportunity for the formation of pores with appropriate size diffusion, and finally fabricated a micro-nano-scaled surface with superhydrophobicity. Otherwise the Ag-Mt/PC performed high catalytic activity on the degradation reaction of methylene blue (the nearly complete degradation took only 25. min), slow release property and antibacterial activity on both Staphylococcus aureus ATCC6535 and Escherichia coli ATCC8739 (the mean diameter of inhibition zone was almost 50% larger than PC), which indicated that this simple and inexpensive approach could be more broadly applied to fabricate large-area functionalized surface via engineering materials with superhydrophobicity and utilize potential practical applications in the future. © 2015 Elsevier B.V..

Xu T.,Key Laboratory of Enhanced Heat Transfer and Energy Conservation | Xu T.,South China University of Technology | Xu T.,Guangzhou Maritime Institute | Gao X.-N.,Key Laboratory of Enhanced Heat Transfer and Energy Conservation | And 6 more authors.
Industrial and Engineering Chemistry Research | Year: 2013

Laminar flow diffusion combustion appears when liquid ethanol passes through the ceramic tubes with inner diameter of 1.0 mm, 0.6 mm and 0.4 mm and outer diameter of 2.0 mm. Due to the limitation of measurement tools, it is very difficult to measure the microflame characteristic parameters and the numerical simulation method for microflame is always employed. By comparing the simulation results and measured values, liquid droplet radiation heat transfer and boundary slip have significant effect on numerical simulation and the numerical simulation values agree well with the experimental data, which proves that the numerical simulation method is reliable. The numerical simulation results show that the flame height and width increase almost linearly with the volume flow while the maximal temperature of flame increases first and then decreases. Because the microscale effect can improve the combustion efficiency, A flame with smaller height and width and lower maximal temperature is observed at a lager inner tube diameter. © 2013 American Chemical Society.

Jia C.,South China University of Technology | Jia C.,Guangdong Light Industry Technical College | Chen G.,South China University of Technology | Li X.,South China University of Technology | Chen Q.,South China University of Technology
International Conference on Digital Printing Technologies | Year: 2011

Many factors affect the ink droplet placement, such as aerodynamic interactions between droplets in flight and the movements of air caused by droplet streams and the motion of print-head and substrate. In this paper, a special experiment has been designed to check the influence on droplet placement exerted by substrate movement. We can ascertain the influences through checking the shape of droplet and the distance between two rows of droplet. In this experiment, the distance between printing head and substrate and the ink droplet flying velocity has been considered. From the experimental result, we can analysis the droplet placement characteristic under the condition of moving substrate, and the result could be helpful to the web feed inkjet printing technology. ©2011 Society for Imaging Science and Technology.

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