http://nopr.niscair.res.in/handle/123456789/13659 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/13692 Title: Dyeing parameters of hydroxynaphthoquinones extracted from <i style="">Arnebia</i> <i style="">nobilis</i> Rech.f <br/> <br/>Authors: Arora, Anjali; Rastogi, Deepali; Gupta, Deepti; Gulrajani, M L <br/> <br/>Abstract: Ratanjot (<i style="">Arnebia nobilis</i> Rech.f) has been used to extract dye for its application on various textile substrates such as cotton, wool, silk, nylon, polyester and acrylic. The sensitivity of the dye extract to <i>p</i>H and temperature is studied. The dye exhibits acute sensitivity to <i style="">p</i>H in terms of its solubility and colour. It is found to be thermally stable upto 80°C. The dyed polyester shows pink colour, nylon shows blue and all other substrates acquire a purple hue under similar dyeing conditions. This may be due to the reduction of dye from quinonoid form to benzenoid form in all the substrates except in polyester. The dye shows excellent wash, rub and perspiration fastness, however light fastness is found to be poor. <br/> <br/>Page(s): 91-97 http://nopr.niscair.res.in/handle/123456789/13691 Title: Influence of UV radiations on the extraction and dyeing of cotton fabric with <i style="">Curcuma longa</i> L <br/> <br/>Authors: Adeel, Shahid; Bhatti, Ijaz A; Kausar, Afifah; Osman, Eman <br/> <br/>Abstract: The methanolic extract of irradiated <i style="">Curcuma longa</i> L powder has been prepared and used to study the dyeing conditions and characteristics of dyed cotton fabrics. The dyeing parameters such as time, material-to-liquid ratio and salt concentration have been optimized. To improve the colour fastness, pre- and post-mordanting has been carried out using copper , iron and alum mordants. The dyed samples are subjected to CIE Lab system using spectraflash SF-650 for the evaluation of colour strength and L*, a* and b* values. Finally, ISO standard methods are employed to study the colour fastness of dyed and mordanted fabrics. It is observed that the UV-radiation not only enhances the colour strength of dye on cotton fabric but also improves the colour fastness properties of irradiated cotton using methanol solubilized extracts of pre-irradiated <i style="">Curcuma longa</i> powder. <br/> <br/>Page(s): 87-90 http://nopr.niscair.res.in/handle/123456789/13690 Title: Extraction of natural dye from <i style="">Dahlia variabilis</i> using ultrasound <br/> <br/>Authors: Mishra, Pradeep K; Singh, Pratibha; Gupta, Kamal K; Tiwari, Harish; Srivastava, Pradeep <br/> <br/>Abstract: Performance of ultrasound assisted extraction (UAE) technique for the extraction of colourant from <i>Dahlia variabilis</i> has been compared with conventional solvent extraction method. It is observed that UAE is more efficient process as compared to solvent extraction. The extracted dye is also characterized by FTIR and UV spectrophotometer. Change in colour with <i>p</i>H of extracted dye is observed due to bathochromic shift from blue green (<i>p</i>H 8.9) to deep red (<i>p</i>H 2.0). The extracted dye is also used for dyeing of wool yarns, generally used in the carpet industries. Good fastness properties of dyed yarn confirm its utility in the textile industries for eco-dyeing. The extracted dye also shows good potential to replace phenolphthalein as an indicator. <br/> <br/>Page(s): 83-86 http://nopr.niscair.res.in/handle/123456789/13689 Title: Development of a quantitative assessment method for self cleaning by photocatalytic degradation of stains on cotton <br/> <br/>Authors: Sharma, Bhavana; Jassal, Manjeet; Agrawal, Ashwini K; Goyal, Nidhi; Rastogi, Deepali <br/> <br/>Abstract: This paper reports a standardised method termed as Stain Degradation Assessment (SDA) method, developed for the quantitative evaluation of self-cleaning efficiency of the finished fabric. The method involves (i) a standardized staining procedure to apply a uniform stain on the fabric, (ii) instrumental evaluation of photodegradation of stain in terms of <i style="">K/S</i> using a template to reduce error, and (iii) analysis of <i style="">K/S</i> values to evaluate stain degradation in percentage and its comparison with visual assessment. This method has been found to give a reproducible and comparable assessment of stain degradation on the textile material with respect to UV exposure. <br/> <br/>Page(s): 74-82