Research Papers

Bacterial Cellulose as a Template for the Formation of Polymer/Nanoparticle Nanocomposite

[+] Author and Article Information
Cai Zhijiang

 Key Laboratory of Advanced Textile Composites, Ministry of Education, Tianjin Polytechnic University, No 63 ChenLin Street, HeDong District, Tianjin 300160, Chinacaizhijiang@hotmail.com

Hou Chengwei, Yang Guang

 Key Laboratory of Advanced Textile Composites, Ministry of Education, Tianjin Polytechnic University, No 63 ChenLin Street, HeDong District, Tianjin 300160, China

Kim Jaehwan

 Department of Mechanical Engineering, Creative Research Center for Electro-Active Paper Actuator, Inha University, 253 Yonghyun-Dong Nam-Ku, Incheon 402-751, South Korea

J. Nanotechnol. Eng. Med 2(3), 031006 (Jan 10, 2012) (6 pages) doi:10.1115/1.4004361 History: Received April 17, 2011; Revised May 18, 2011; Published January 10, 2012; Online January 10, 2012

In this paper, we investigate a novel method using bacterial cellulose (BC) as template by in situ method to prepare BC/silver nanocomposites. We first introduce sonication procedure during immersion and reduction reaction process to make sure that the silver nanoparticles can be formed and distributed homogeneously throughout the whole bacterial cellulose network. The BC/silver nanocomposites were confirmed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). To examine the effect of varying solution concentrations on silver nanoparticles formation, the concentration of AgNO3 solution was increased from 0.01 M to 0.05 M and Ag+ -ions were reduced by the same concentration of NaBH4 . The effects of time and frequency of sonication on BC/silver nanocomposite preparation were also investigated by varying sonication time from 10 min to 60 min and sonication frequency from 20 kHz to 60 kHz. Compared with an ordinary process, ultrasound seems to be an effective way for ions to penetrate into BC and thus the weight percent of silver nanoparticles can be increased. Combined with TGA result, the weight percent of silver nanoparticles can be improved from 8.9% to 31.7% with simple sonication procedure performed by the same preparation condition. However, the average size of silver nanoparticles is around 15 nm, which is bigger than ordinary process. This may be due to the aggregation of small nanoparticles, especially at high AgNO3 concentration.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

SEM images of BC/silver nanocomposites (a, c, e: surface morphology and b, d, f: cross-section morphology of BCAg1, BCAg2, and BCAg3)

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Figure 2

SEM cross-section images of BC/silver nanocomposites (a, b, c, and d: BCAg4, BCAg5, BCAg6, and BCAg7)

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Figure 3

EDX spectrum of the membrane cross-section of the BC/silver nanocomposite BCAg2 (a), SEM image (b), and Ag map showing the distribution of the silver nanoparticles (red points) in the cross-section of BC/silver nanocomposite BCAg2 (c)

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Figure 4

X-ray diffraction patterns of BC and BC/silver nanocomposite (a: blank BC; b: BCAg-2)

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Figure 5

TGA curves for BC and BC/silver nanocomposites



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