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RISS 인기검색어
- 검색키워드
- 저자 : Roli Purwar (검색결과 3 건)
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Banana Pseudostem Sap as a Biomordant for Dyeing of Silk with Celosia Flower
Shyam Barahapurkar,Roli Purwar,Rajat Kumar Baldua 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9
This research paper is focused on the dyeing of silk fabrics with a natural dye extracted from Celosia flower andbanana pseudostem sap as a biomordant. The dyeing process was carried out by three different techniques i.e. pre-, post-, andsimultaneous mordanting method. The effect of dyeing process parameters namely mordant concentration, pH, andtemperature on the dye absorption and fastness properties of dyed silk fabric have been investigated for each dyeing method. Optimal values of dyeing process parameters have been categorized based on the highest value of dye absorption in terms ofK/S value. Optimum mordant concentration was found to be 18 % for all sets of dyeing methods. The optimum pH wasexamined to be 4.5, 4.0, and 4.0 and dyeing temperature was 70 °C, 70 °C, and 65 °C for the pre-, post-, and simultaneousmordanting dyeing methods, respectively. The color fastness to light, washing, and rubbing of dyed silk fabrics wasinvestigated. Fastness values of light and rubbing showed fair-to-good fastness level, whereas the color fastness to washingwas found to be good to very good. The antibacterial activity of the banana sap mordanted and simultaneously dyed silkfabrics was evaluated. The dyed silk fabric exhibited moderate antibacterial activity against gram-positive and gram-negativebacteria.
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Antimicrobial Finishing of Cotton Textiles using Silver Intercalated Clay
Rosina Begam,Mangala Joshi,Roli Purwar 한국섬유공학회 2022 Fibers and polymers Vol.23 No.1
This paper describes the potential use of silver intercalated clay as an antimicrobial finishing agent for cottontextiles meant for health and hygiene applications. Montmorillonite clay (2:1) was intercalated with silver ion through ionexchange reaction. The modified clay was characterized using wide angle X-ray diffractometer (WAXD), Energy dispersiveX-ray spectroscopy (EDX) and inductive coupled plasma spectroscopy (ICP). Results of WAXD revealed that the clay waspartly exfoliated after ion exchange reaction. EDX and ICP analysis confirmed the presence of silver ion in modified clay. The silver intercalated clay was integrated on the cotton fabric using pad dry cure method along with low formaldehydedimethyloldihydroxy ethylene urea (DMDHEU). The antimicrobial and mechanical properties of the finished fabric werestudied. The fabric showed excellent antimicrobial activity up to 10 machine washes. The silver ion releases from the fabricand inhibited the growth of bacteria on the surface of the fabric. The release of silver ion from the finished fabric at differentperspiration and saline water were analyzed. It was found that the silver ion releases faster in alkaline perspiration mediumcompared to acid perspiration medium.
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Chandra Mohan Srivastava,Roli Purwar 한국고분자학회 2018 Macromolecular Research Vol.26 No.10
This research was focused on the two-step regeneration of Antheraea mylitta (tasar) fibroin in the form of electrospun 3D self-assembled nanofibrous nonwoven mats using ionic liquid and formic acid/CaCl2.The self-assembled structure of tasar nanofibrous nonwoven mats was dependent on the silk fibroin concentration and spinning voltage. The secondary conformation of tasar fibroin protein before and after electrospinning was analyzed by Fourier transformation infrared spectroscopy. The morphology of the nanofibrous mat was studied by scanning electron microscope. The self-assembled 3D tasar nonwoven nanofibrous construct was a highly porous and spongy structure with high water absorption and water vapor transmission. Highly porous 3D self-assembled tasar nonwoven nanofibrous construct favored good growth and proliferation of L929 skin fibroblast cells. Based on these properties, 3D self-assembled tasar nonwoven nanofibrous construct is a promising material for skin tissue engineering and wound dressing applications.
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