Browsing by Author "Periyasamy, Aravin Prince"
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- ItemEffect of silanization on copper coated milife fabric with improved EMI shielding effectiveness(Elsevier Ltd, 2020) Periyasamy, Aravin Prince; Yang, Kai; Xiong, Xiaoman; Venkataraman, Mohanapriya; Militký, Jiří; Mishra, Rajesh; Křemenáková, DanaElectromagnetic interference takes place due to the increase in complexity of electronic devices/systems in the form of higher packing density for quick response. To overcome its adverse effects, the effective shielding of components is needed abundantly. This leads to an increase of undesirable influence of electromagnetic signals and troublesome charges against which protection of human beings is required. Textile based structure with electromagnetic shielding ability has promising replacement of conventional materials due to its flexibility, air permeability and comfort properties. In this work, a copper coated fabric was silanized with different types of silane to stabilize the copper deposition on the fabric. Three different silanes were used for the silanization treatment to stabilize the copper deposition. The results showed excellent electromagnetic shielding properties. In addition to that, electrical and physical properties of the fabrics were evaluated before and after silanization treatment.
- ItemEffects of alkali pretreatment on lyocell woven fabric and its influence on pilling properties(TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2019-09) Periyasamy, Aravin Prince; Trykarová, JitkaExperiments were conducted to study the influence of various concentration of alkalis on the pilling properties of lyocell fabrics. Generally, the lyocell fabric has more tendency of pill formation due to fibrillation properties. Therefore, present work is focused on the impact of alkali pretreatments with various concentration from 0.5 mol/L to 3 mol/L on lyocell with their pilling resistance. Due to the morphological changes, pilling results are attributed to the alkali types and their concentration. Treatment with TmAH and LiOH at 2 mol/L shows the reduction of a number of fibrils leading to reduce the pill generation significantly. Carboxyl content and iodine sorption value are analyzed to find the impact of alkali on the accessible region and structural changes respectively, also surface modification was observed by SEM to confirm the surface characteristics. Overall results shows that the reduction of fibrillation leads to better pilling resistance of lyocell fabric.
- ItemFlexural Behavior of Carbon Textile-Reinforced Geopolymer Composite Thin Plate(MDPI, 2019-11-08) Le Chi, Hiep; Louda, Petr; Periyasamy, Aravin Prince; Bakalova, Totka; Kovačič, VladimírTextile-reinforced Portland cement-based concrete has been researched and developed over the last few decades. It was widely used in a different range of applications, such as repair and/or strengthening of structural elements, thin walls, lightweight structures, façade elements, and others. Due to its varied application, this study aims to develop the carbon textile-reinforced geopolymer composite. Specimens of rectangular form with the dimensions of 400 × 100 × 15 mm3 , reinforced with carbon textile, were produced. Four-point bending test was used to evaluate the effect of carbon textile on the mechanical strength of reinforced geopolymer composite based on the three factors: the different mortar compositions corresponding to the addition of the chopped basalt fiber (BF), the number of carbon textile layers, and the different thicknesses of the mortar cover layer. Besides that, a small part of the pull-out test was also considered to assess the adhesion strength at the interface between carbon textile and geopolymer mortar. The experimental results from the four-point bending test showed that the mechanical strength of composite specimens increased when the content of the chopped basalt fiber increased. With the increasing number of the textile layers, the specimens improved the flexural strength significantly. However, the flexural toughness of the specimens reinforced with three textile layers did not improve, as compared to those reinforced with two textile layers. The experimental results for the specimens related to the mortar cover thicknesses indicated that specimens with the mortar cover thickness of 2 mm provide the best strength. The experimental results from the pull-out tests showed that all the specimens have the same failure mode by slipping of the fiber yarn from the matrix.
- ItemInfluence of EMI Shielding on Silane-coated Conductive Fabric(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2019) Periyasamy, Aravin Prince; Yang, Kai; Xiong, Xiaoman; Venkatraman, Mohanapriya; Militký, Jiří; Mishra, Rajesh; Křemenáková, DanaElectromagnetic interference (EMI) takes place due to an increase in the complexity of electronic devices/systems in the form of higher packing density for a quick response. To overcome its adverse effects, the effective shielding of components is abundantly needed. This leads to an increase in the undesirable influence of electromagnetic signals and troublesome charges against which the protection of human beings is required. A textile-based structure with electromagnetic shielding ability is a promising replacement for conventional materials due to its flexibility, air permeability and comfort properties. In this work, a Cu-coated fabric was silanized with different types of silane to stabilize the Cu deposition fabric. Three different silanes were used in the silanization treatment in order to stabilize the Cu deposition. The results showed improved electromagnetic shielding properties.
- ItemLife Cycle assessment of denim: A review(2019) Periyasamy, Aravin PrinceThe textile industry has one of the largest environmental impacts in the world. Due to ecological concerns, it is necessary to find the ways to reduce these environmental impacts. This is true with denim as it is made of cotton, which, in most cases, is a very polluting crop, dyed with indigo, a dye with a very damaging degree of fixation which initiates huge ecological problems. Life cycle assessment provides data from every stage of a product's life, from the cradle to the grave (i.e., from raw material extraction through cultivation, manufacturing, distribution, use, repair and maintenance, and disposal or recycling). These data can be considered as one of the first ways to reduce environmental impacts. Therefore, the life cycle assessment of denim and how it affects the ecosystem is important to know. This article will provide some ideas about the life cycle assessment and its importance, life cycle of denim, life cycle assessment tool, phases of the life cycle assessment and a life cycle assessment of denim with actual data.
- ItemPhotochromic Polypropylene Filaments: Impacts of Mechanical Properties on Kinetic Behaviour(2019) Periyasamy, Aravin Prince; Vikova, Martina; Vik, MichalSpiro [2H-indole-2,3'-[3H]naphth [2,1-b][1,4]oxazine],1,3-dihydro-1,3,3-trimethy-6'-(1-piperidinyl) was incorporated onto polypropylene and photochromic polypropylene multifilaments produced through the mass coloration technique. Subsequently the polypropylene (PP) filaments were doped with a different concentration of photochromic pigment, and after producing the filaments different drawing ratios were applied. The photochromic colour build was found to be maximum with the highest concentration of dyes as well as with the lowest drawing ratio. Also the colour differences for L*, a*, b* and Delta E* were analysed with respect to the different concentrations and drawing ratios of the filament. The filaments generally showed good stability of photocoloration during the colour measurement till five cycles. The results for the optical density were reduced by increasing the fineness of the filament. In this experimental work, the impact of the drawing ratio on the optical and mechanical properties of these multifilaments were investigated.
- ItemPreparation of photochromic isotactic polypropylene filaments: influence of drawing ratio on their optical, thermal and mechanical properties(SAGE Publications Ltd, 2020) Periyasamy, Aravin Prince; Viková, Martina; Vik, MichalIn this research, metallocene catalyst isotactic polypropylene (miPP) filaments were produced with different concentrations of photochromic pigments to develop ultraviolet (UV) sensing materials. The produced miPP filaments showed good photochromic response under UV irradiation. In this work, six drawing ratios were applied to get the final product (miPP filament). Resultant filaments showed significant photochromic responses, such as Kubelka–Munk values (K/S). The interesting observation was that the photochromic response was indirectly proportional to the applied drawing ratio. The photochromic color build was found to be maximum with the highest concentration of pigment as well as the lowest drawing ratio. Overall, it was observed that the thermal properties were significantly dependent on the drawing ratio. The changes in thermal properties, such as Tm, ΔHm and ΔSm, for miPP filaments in dependence on photochromic pigment concentration was significantly less as compared to the drawing ratios. The thermal properties improved with the drawing ratio, which directly influenced the crystallinity of produced miPP filaments. The addition of photochromic pigment to the miPP filaments increased the crystallinity by 14%. Also, the lamella thickness increased with increasing the drawing ratio. However, there was no significant effect of pigment concentration on lamella thickness. In this experimental work, the impact of drawing ratio on the optical, thermal and mechanical properties of photochromic miPP filaments was investigated.
- ItemProgress in Sol-Gel Technology for the Coatings of Fabrics(MDPI, 2020-03-18) Periyasamy, Aravin Prince; Venkataraman, Mohanapriya; Křemenáková, Dana; Militký, Jiří; Zhao, YanThe commercial availability of inorganic/organic precursors for sol-gel formulations is very high and increases day by day. In textile applications, the precursor-synthesized sol-gels along with functional chemicals can be deposited onto textile fabrics in one step by rolling, padding, dip-coating, spraying or spin coating. By using this technology, it is possible to provide fabrics with functional/multi-functional characteristics including flame retardant, anti-mosquito, water- repellent, oil-repellent, anti-bacterial, anti-wrinkle, ultraviolet (UV) protection and self-cleaning properties. These surface properties are discussed, describing the history, basic chemistry, factors affecting the sol-gel synthesis, progress in sol-gel technology along with various parameters controlling sol-gel technology. Additionally, this review deals with the recent progress of sol-gel technology in textiles in addressing fabric finishing, water repellent textiles, oil/water separation, flame retardant, UV protection and self-cleaning, self-sterilizing, wrinkle resistance, heat storage, photochromic and thermochromic color changes and the improvement of the durability and wear resistance properties.
- ItemSpectral and physical properties organo-silica coated photochromic poly-ethylene terephthalate (PET) fabrics(TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2019) Periyasamy, Aravin Prince; Viková, Martina; Vik, MichalIn this study, photochromic fabrics were prepared by incorporating the spirooxazine derivative of 5-chloro-1,3-dyhydro-1,3,3-trimethylspiro[2H-indole-2,3 '-[3H]-naphth [2,1-b] [1,4] oxazine on the polyethylene terephthalate (PET) fabric through a sol-gel coating process. The treated fabrics showed good photochromic response under UV irradiation. In this work, three types of silane were used as the silica precursor and the resultant coatings showed a significant difference in their photochromic response such as Kubelka-Munk function (K/S), change in optical density (Delta OD) rate constant and half-life. The coated fabric shows two different absorption maxima and however it confirms that there is strong influence on the type of silane. The functional group of uncoated and sol-gel coated fabrics are analyzed by ATR-FTIR. The type of the silane also influences the physical properties of the coated fabrics. The surface characteristics were analyzed by scanning electron microscope (SEM) and laser scanning confocal microscope (LSCM), which showed significant changes in the surface micro-roughness after coating.
- ItemVlastnosti fotochromních textiliíPeriyasamy, Aravin Prince; Viková Martina, doc. Ing. Ph.D. Skolitel : 60074Tato práce je zaměřena na analýzu fyzikálních, mechanických a optických vlastností fotochromních materiálů. Pomocí dvou různých technik byly vyrobeny fotochromní textilní materiály. Jednou z nich bylo barvení ve hmotě; druhou byla technika zvaná sol-gel. V případě barvení ve hmotě byly vyrobeny multifilamenty polypropylenu (PP) s různou koncentrací fotochromních pigmentů s různým dloužícím poměrem. Většina této práce se zabývá vlivem různého dloužícího poměru na optické, fyzikální a mechanické vlastnosti multifilamentů. Na sol-gelem potažených polyesterových tkaninách byly použity různé prekurzory k nalezení vlivu kombinace prekurzorů na fotochemickou reakci. V tomto případě byly nalezeny zajímavé účinky nazývané hypsochromní posuny.