Dmdheu lopez leon et al 2005 boonyo et al 2008 loretz

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DMDHEU (Lopez-Leon et al. 2005 ; Boonyo et al. 2008 ; Loretz and Bernkop 2006 ). The crease recovery property as a function of chitosan and nanochitosan treatments has been compared against DMDHEU. The crease recovery angle of cotton fabric is greatly reduced by the treatment of normal chitosan (CHT1). Treatment of cotton fabric with chitosan of lower particle size is found to improve the crease recovery of cotton fabric. However, yet it could not gain the rating of commercially used cross-linking agent DMDHEU. Conventional chitosan is believed to form a surface coating which lowers the possibility of cross-linking and therefore cannot contribute to the load-sharing phenomenon. Owing to the greater penetration of the nanochitosan into the fabric structure, the improved wrinkle recovery property is improved. These polycationic nanoparticles may be bound to the fi bre molecules and resist creasing to a certain degree, owing to their better penetration. 7.11 In fl uence of Nanochitosan on Antibacterial Effect Owing to their moisture and warmth, cotton fi bres are similar to other natural fi bres in creating a conducive environment for the growth of microorganisms. The Advances in Nanotextile Finishes An Approach Towards Sustainability 23
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organisms cause discolouration, development of rancid/bad odour, stains and strength loss of fabric, skin allergies, and also infectious diseases in human body (Knittel and Schollmeyer 2002 ; Lopez-Leon et al. 2005 ). One of the most popular ways of imparting antimicrobial resistance is to use nanosilver colloid. Chitosan, being polycationic material, binds to anionic surfaces of microbe cell wall and disrupt it leading to death of cell (Loretz and Bernkop 2006 ). Attributing to the antibacterial and metal particle retention properties of chitosan (Du et al. 2009), the fabric was treated with chitosan and nanochitosan and then with nanosilver colloid. Nanosilver colloid with 1 × 10 - 3 M/100 mL concentration and average particle size 110 nm has been prepared as reported elsewhere (Loretz and Bernkop 2006 ). The resistance against bacterial attack of untreated and treated samples of cotton was determined by measuring the loss in strength due to soil burial test. The chitosan can be used as an ef fi cient antibacterial agent. There is improved effect due to the decrease in particle size of nanochitosan and coupling with nanosilver. 8 Printing of Polyester Fabric with Disperse Dye Nanoparticles 8.1 Overview Disperse dye has been ground to a nanosize of 23 nm and then exposed to ultra- sound treatment, in the form of a solution with two dye concentrations for 8 h. The nanoparticle suspension is directly added to the stock thickener and printed on a polyester substrate. All measurements as well as various parameters affecting dye fi xation are investigated. The results indicate that grinding and ultrasound exposure of the dye results in minimizing particle size, which facilitates dye penetration in the hydrophobic substrate (Osman and Khairy 2013 ). This result is obtained
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  • Fall '19
  • N. Gokarneshan

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