• SABU THOMAS

Articles written in Bulletin of Materials Science

• Short fibre elastomer composites: effect of fibre length, orientation, loading and bonding agent

A series of short fibre reinforced styrene butadiene rubber (SBR) composites were prepared by incorporating sisal fibres of different lengths and different concentrations. The vulcanization behaviour and the properties of the vulcanizates were measured by the relevant ASTM procedures. The processing characteristics such as green strength and mill shrinkage were improved by the addition of fibres. The properties like tensile strength, tear strength, moduli at 10% and 20% elongations were found to be maximum for composites containing longitudinally oriented fibres of length 6 mm. Mixes containing 35 phr loading of fibres and bonding agent showed better mechanical performance than others. The failure behaviour of tensile and tear specimens have been analysed by scanning electron microscopy techniques.

• Laponite$^{\circledR}$clay/poly(ethylene oxide) gel beads for delivery of plant growth-promoting rhizobacteria

Hydrogels have been extensively used for crop improvement and this study presents a novel and facile synthesis method of clay nanocomposite hydrogel beads for encapsulation of plant probiotic bacteria. The nanocomposite used in the study consists of poly(ethylene oxide) and laponite clay. The hydrogel beads were prepared in a one-step synthesis technique to encapsulate five Pseudomonas strains both alone and as a consortium. The effects of this polymer nanocomposite (PNC) gel/plant growth-promoting rhizobacteria (PGPR) in various combinations were studied using Vigna unguiculata by evaluating its growth parameters. Here, significant improvement of leaf length, leaf number andshoot length could be observed for the consortium-encapsulated PNC hydrogel beads treated plants when compared with the untreated as well as single strain bacteria treated. In addition, the microbial viability studies indicated the PGPR to be stable up to 60 days within the PNC beads. The results of the study indicate great potential of the PNC beads mediated delivery of plant probiotic bacteria for the replacement of chemically synthesised and environmentally hazardous fertilisers.

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020