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IFM's Gayathri Devi Rajmohan has won the People's Prize in Deakin's Three Minute Thesis competition for 2013.
Meet the team at Deakin making it happen.
Dr Xiujuan Jane Dai
+61 3 522 72427
The research in textile industry applications includes:
Our new approaches to address the different challenges in these areas include:
A three-step plasma treatment-activation, functionalization and polymerization-has been used to deposit a thin plasma polymer with amine groups on carbon fibres (CFs). This plasma polymer has strong adhesion to the CF surface and the amine groups enable strong bonding to a matrix. The CFs were first treated by Ar plasma to activate and clean the surface, followed by O₂ plasma to incorporate oxygen-containing functional groups, and finally a heptylamine thin film was deposited using combined continuous wave and pulsed plasma polymerization. Strong adhesion between the plasma polymer and the CF was observed. The fibre strength was not affected by the treatment.
In this work, we have systematically studied the improvement of binding of polypyrrole with polyethylene terephthalate (PET) thin films and fabrics using low pressure oxygen plasma. A range of plasma treatment times were employed to investigate plasma induced effects on surface roughness, surface chemistry and hydrophilicity. Modifications of PET films were studied with respect to surface morphology by means of atomic force and scanning electron microscopy. Chemical effects of plasma treatment were studied using X-ray photoelectron spectroscopy. Results showed that both the increase in surface functionalisation by carboxylic groups and formation of nano size roughness contributed to improved adhesion and conductivity.
SEM images of cross sections of PPy coated PET fibres from coated fabric samples without plasma pre-treatment and after plasma pre-treatment: (a) control sample, and (b) 500 s plasma treated PPy coated PET fibre cross sections.
Improvement of the binding of polypyrrole with PVDF (polyvinylidene fluoride) thin film using low pressure plasma was studied. The effects of various plasma gases i.e., Ar, O₂ and Ar + O₂ gases on surface roughness, surface chemistry and hydrophilicity were noted. The topographical change of the PVDF film was observed by means of scanning electron microscopy and chemical changes by X-ray photoelectron spectroscopy, with adhesion of polypyrrole (PPy) by abrasion tests and sheet resistance measurements. Results showed that the increase in roughness and surface functionalization by oxygen functional groups contributed to improved adhesion and Ar + O₂ plasma gave better adhesion.
We have used the nanosecond pulsed atmospheric pressure plasma (NPAPP) system for wastewater treatment. This system combines a pulsed electric field, UV radiation, O₃, and free radicals. It has shown very promising results for textile wastewater treatment both in the bleaching of dye liquors and reducing total organic carbon content.
A systematic study was conducted using argon, oxygen and nitrogen plasma to improve the adhesion of polypyrrole coating to polyester fabric for improving conductivity and to understand the mechanisms involved. Polyester thin film was used as a reference sample. The changes in wettability, surface chemistry and morphology were studied by water contact angle, x-ray photoelectron spectroscopy and atomic force and scanning electron microscopy. It was found that both the highest conductivity and the strongest interfacial bonding were achieved by oxygen plasma treatment. The increase in hydrophilicity, surface functionalization and suitable nano-scale roughness gave improved adhesion.
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