Experimental Investigation of Cellulose/Silver Nanocomposites Using In Situ Generation Method

L. Muthulakshmi, N. Rajini, H. Nellaiah, T. Kathiresan, M. Jawaid, A. Varada Rajulu

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Cellulose gel films were prepared by regeneration process using pre-cooled aq.(8 wt% LiOH + 15 wt% urea) mixture as solvent and ethyl alcohol as non solvent. The Terminus cattapa leaf extract diffused wet cellulose films were then dipped in 1–5 mM aq.AgNO3 solutions to allow in situ generation of silver nanoparticles (AgNPs). Besides the in situ generation, some AgNPs were also formed outside the wet films in the solution. The AgNPs formed outside the films were observed under transmission electron microscope and scanning electron microscope. The nanocomposite films were also characterized by Fourier transform infrared spectroscopy, X-ray diffraction and thermogravimetric analysis and tensile test. The thermal stability of the composite films was lower than that of the matrix up to a temperature of ~300 °C and afterwards showed a reverse trend. The tensile strength of the nanocomposite films was found to be higher than the matrix but decreased with increasing concentration of aq.AgNO3. The cellulose/AgNPs composite films showed good antibacterial activity against E. coli (gram positive) and Bacillus sp. (gram negative). Based on the aforementioned properties, the cellulose/AgNPs composite films can be considered for antibacterial packaging and medical applications.

Original languageEnglish
Pages (from-to)1021-1032
Number of pages12
JournalJournal of Polymers and the Environment
Volume25
Issue number4
DOIs
Publication statusPublished - Dec 1 2017
Externally publishedYes

Keywords

  • Antibacterial activity
  • Biodegradable nanocomposites
  • Crystallinity
  • In situ generation
  • Silver nanoparticles
  • Thermal stability

ASJC Scopus subject areas

  • Environmental Engineering
  • Polymers and Plastics
  • Materials Chemistry

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