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Fabricating multifunctional nanoparticles bonded to enzymatically oxidized fabrics for their various applications

Sun, 01 Dec 2019 00:00:00 GMT

Title: Fabricating multifunctional nanoparticles bonded to enzymatically oxidized fabrics for their various applications Authors: Ammulu, Manne Anupama; Tammina, Karishma; Bonigala, Bodaiah; Vemuri, Praveen kumar; Podha, Sudhakar; Ronda, Srinivas Reddy Abstract: An effective procedure for obtaining fragrance finished fabric based on cellulose and chitosan has been developed. The first step involves the formation of oxidized cellulose, which is able to form a schiff’s base with the chitosan. In order to maintain the strength of fabric, a novel enzymatic method for oxidation of cellulose is adopted. In the second step, chitosan nanoparticles loaded with the jasmine oil are prepared and coated on the oxidized cellulosic fabric by forming a strong covalent bond. The FTIR analysis proves the formation of cellulose-chitosan composite. Scanning electron microscopic study demonstrates the coating of nanoparticles on the cotton fabrics. The retention capacity of the jasmine oil in the fabric after repeated washings is proved by GC analysis. The cotton fabrics finished by the covalent bonded coating of chitosan nanoparticles loaded with the jasmine fragrance are found to have a better sustained release capability for a longer time as compared to the conventionally entrapped nanoparticles in the fabric. Page(s): 381-388

Moisture management properties of eri silk knitted fabrics

Sun, 01 Dec 2019 00:00:00 GMT

Title: Moisture management properties of eri silk knitted fabrics Authors: Kumar, B Senthil; Kumar, M Ramesh; Ramachandran, T; Parthiban, M Abstract: Moisture management and wicking properties of eri silk knitted fabrics have been studied. Three different knit structures, namely single jersey, single pique and honeycomb, have been developed with the combination of two different yarn count and tightness level. The fabrics developed are analyzed in terms of wetting time, spreading speed, absorption rate, and maximum wetting radius, accumulative one way transport index (AOTI) and overall moisture management capacity (OMMC). It is discerned that the variables, such as yarn count, fabric tightness and knitting structure, have a significant influence on the wicking and moisture management properties. The OMMC indexes of eri silk knitted fabric are found to range from ‘very good’ to “excellent’ category, which indicates the suitability of eri silk yarn to skin fit as well as active wear applications. Page(s): 389-395

Radiant heat protective performance of clothing assemblies with flexible aerogel-Nomex nonwoven composite as thermal insulation

Sun, 01 Dec 2019 00:00:00 GMT

Title: Radiant heat protective performance of clothing assemblies with flexible aerogel-Nomex nonwoven composite as thermal insulation Authors: Chakraborty, Supriyo; Rao, A Venkateswara; Kothari, V K; Pisal, A A Abstract: In order to achieve a superior level of heat protection, aerogel-Nomex nonwoven composite felts have been prepared and used as middle layer in 3-layered fabric. To study the effect of precursor concentration on the radiant heat protection, methyltrimethoxysilane (MTMS) precursor to methanol molar ratios are varied for making the flexible aerogel-Nomex nonwoven felt. The heat protective performance of three-layered clothing assemblies, with aerogel-Nomex nonwoven felt as the thermal insulating middle layer [outer layer Nomex IIIA woven and inner layer modacrylic-cotton (60:40) woven fabric] has been determined by exposing the clothing combinations to pure radiant heat fluxes by using Stoll’s criterion. The use of aerogel-Nomex nonwoven fabric shows more than 100% increase in the heat protection time as compared to the conventional multilayered heat protective clothing assembly. The aerogel-Nomex nonwoven fabric samples produced using MTMS precursor are found to be soft and flexible as compared to the conventionally produced pure silica aerogels, by using tetra-alkoxysilanes, which are normally fragile in nature. Page(s): 396-403

Novel composite meshes to evaluate their structural property and in vivo biocompatibility for tissue repair

Sun, 01 Dec 2019 00:00:00 GMT

Title: Novel composite meshes to evaluate their structural property and in vivo biocompatibility for tissue repair Authors: Lu, Yao; Fu, Shaoju; Hu, Bing; Cheng, Ge; Li, Nannan; Zhou, Shuanglin Abstract: Composite meshes of different types have been prepared and used for tissue repair in pelvic floor disorder. An interlocking texture mesh (inter-mesh) and a membrane coated mesh (electro-mesh) have been used based on their structural property and biocompatibility. The proportion of degradation material in inter-mesh (69.6%) is found extremely higher than that of electro-mesh (3.22%), thus leading to higher product weight (65.50±2.31 g/m²) and thickness (0.500±0.025 mm). After 4 weeks of implantation in animal experiment, inter-mesh with surrounding tissues is observed to have higher breaking strength in tensile behavoir and better flexibility. Tissues on inter-mesh are found to grow faster with larger thickness (0.76±0.033 mm). The surface area loss of inter-mesh (2.49±0.25%) is much less than that of electro-mesh (7.49±0.63 %) within the first 2 weeks of implantation. However, the material’s degradation is accelerated after 2 weeks, leading to a higher shrinkage of 13.12±1.48 %. Page(s): 404-410