EXTRA QUESTIONS for Class 6 Science Chapter 3. An antistatic acrylic fiber comprises 90 to 99 wt% acrylonitrile polymer and 10 to 1 wt% of acrylic antistatic resin containing 10 to 70% by weight of acrylonitrile and alkali metal ion which is contained in an amount of not less than 150 ppm.32 The acrylic fiber has antistatic property which does not lower when the fiber is subjected to a spinning and dyeing steps.32, A polyolefin-based antistatic fiber, contains polyethylene resin obtained using a metallocene catalyst and a high molecular antistatic agent which forms a fiber surface.33 The antistatic fiber has a form of a sheath-core type conjugate fiber in which the polyolefin resin composition forms the sheath.33, L. Lau, J. Ultrasound with a frequency range of 20–100 kHz commonly used to accelerate chemical reactions and enhance physical processes, such as cleaning, emulsification and degassing extraction, improved results over other techniques under less optimal conditions such as lower temperatures and chemical concentrations (Sivakumar and Rao, 2003); in addition, mechanical effects are produced, including dispersion, degassing and diffusion, inside the fibre (Vajnhandl and Le Marechal, 2005). (2014) have pretreated cellulosic fabrics with O2 plasma for surface modification followed by treatment with biosynthesized Ag-NPs for attaining remarkable and durable antibacterial activity against S. aureus (G+ve) and E. coli (G−ve) bacteria. They observed an increase in dye uptake in all classes of dye at low temperatures, with less dyeing time compared with conventional dyeing methods and no fibre damage caused by cavitation phenomena. SCIENCE / CHEMISTRY / SCIENTIST BIG BANG COTTON FABRIC … (2007) observed enhanced dye uptake, high colour yield and good fastness properties of cotton fabric dyed with Eclipta natural dye in an ultrasonicator dyeing method. Wang et al. This same fabric is to be treated with 5 % owf of the same chemical finish in a wet on wet pad application with entry wet pickup of 75 %, exit wet pickup of 90 % and interchange factor of 0.7. The dye is extracted from cochineal insects using conventional and ultrasound techniques. Class 6 Science Chapter 3 VERY SHORT ANSWER TYPE QUESTIONS. However, light colored fabric cannot be produced by this method using the dyes normally used on cotton/nylon blends because of the streaks caused by the black antistatic fibers.19 Use of carbon doped antistatic fibers in cotton/nylon blend fabrics permits coloring to light shades. Use of nanoparticles like nano-TiO2 [117,118] and nano-silica [119] have a capability to overcome some of these limitations of conventional crease-resistant finish. $4.05 shipping. Khalil-Abed et al. Cotton fabrics were coated with PANI and PPY polymers using a chemical oxidative polymerization method.7 Both polymers have excellent UV-protection properties (protection of material behind the fabric and protection of cotton). Hashem et al. It may have existed in Egypt as early as 12,000 B.C. (2007, 2009) and Nazaria et al. Ilker Mistik and Yükseloğlu (2005), Karaboğa et al. 100% Cotton. A wide variety of science cotton options are available to you, such as shirt, dress, and garment. Shop science fabric at the world's largest marketplace supporting indie designers. No foreign fibers, no doubt. Science Fabric - Electrophoresis Large By Wolfishie - DNA Marker Biology STEM Science Cotton Fabric By The Yard With Spoonflower Spoonflower. Some specific examples of these applications in the field of textile wet processing include: (i) multifunctional finishing of cellulosic/polyester blends using Ag-NPs/PVP and ZnO-NPs/HBPAA hybrids along with citric acid as an eco-friendly cross-linking agent (Ibrahim et al., 2013e); (ii) simultaneous functionalization and pigment coloration of cellulosic/wool blends using TiO2-NPs along a proper polyacrylate binding agent (Ibrahim et al., 2013h); (iii) development of multifunction cellulosic pigment prints using Ag-, ZnO-, ZrO2-, and TiO2-NPs individually and in the presence of different binding agents (Ibrahim et al., 2013i); (iv) enhancing antibacterial functionality of pigment printed cotton, linen, and viscose cellulosic fabrics by using an Ag-NPs/PVP hybrid (Ibrahim et al., 2013a); (v) combined antibacterial finishing and pigment printing of cotton/polyester blends using Ag-NPs/HBPAA (Ibrahim et al., 2013j); (vi) reactive dyeing and antibacterial finishing of cellulosic fabrics using Ag-NPs loaded on HBPAA (Ibrahim et al., 2012c) in one step; (vii) imparting multifunctional properties to cellulose-containing fabrics using poly (acrylic acid)/poly(ethylene glycol) adduct along with Ag-NPs or TiO2-NPs (Ibrahim et al., 2012b); and (viii) upgrading of antibacterial, UV protection, and self-cleaning properties of cotton fabrics by treatment with silver-, silica-, and titania-based sols by the dip-coating method (Onar et al., 2011). Cotton fabrics can be bleached safely with chlorine bleaches without seriously damaging the cotton fibre. If the fabric has a linear density of 0.250 kg m− 1 and a speed of 80 m min− 1, with linear density of 0.250 kg m− 1, what is the flow rate of solution necessary to maintain a constant level in the pad? The nuisance static can be reduced to acceptable levels in cotton/nylon fabrics by adding at least 1% of thermoplastic fibers doped with carbon black to both the warp and fill yarns. From: The Impact and Prospects of Green Chemistry for Textile Technology, 2019. Vankar et al. In conventional methods, resin based finishing are generally used to impart crease/wrinkle resistance property to textile fabrics. (2010) have introduced plasma surface modification using Ar/N2 (50/50%) plasma to enable greater adhesion of Ag-NPs to raw PET fabric, which in turn enhances the antibacterial activity of the modified substrate. (2007a,b) reported a savings of energy (20%) and water consumption while using ultrasonic waves as a mechanical catalyst in desizing, scouring and bleaching of cotton materials. Cotton fabric is very much susceptible to form creases during use. Fabrics mean a woven material, textile or other materials resembling woven cloth. A wide variety of science fabric options are available to you, such as technics, use, and material. Dec. 11, 2020 — Researchers have reported that fabric coated with a conductive, two-dimensional material called MXene, is highly effective at blocking electromagnetic waves … The use of ultrasound in textile wet processing enhances the wash-fastness properties, improves dye uptake, and reduces energy, processing duration and water consumption (Carr et al., 1997; Vouters et al., 2004; Ma et al., 2008). W.D. R. Houtman, in Fabric Structures in Architecture, 2015. Nevertheless, undiluted bleach poured directly onto the fabric will cause degradation of the garment; therefore it is better to follow the manufacturer’s directions on the use of bleaching agents to ensure the best results.3,6–9. They also investigated the effect of dyeing conditions such as the percentage of salt, pH, ultrasound power, dyeing temperature and duration on colour strength and fastness properties of the dyed fabric. Cotton/Kenaf Fabrics: a Viable Natural Fabric Volume 03 (1999) Issue 2 Application of Methylene Blue Adsorption to Cotton Fiber Specific Surface Area Measurement: Part I. Find out why cotton is the fabric of your life. Natural fabrics such as wool, cotton, silk, and linen are made from animal coats, cotton-plant seed pods, fibers from silkworms, and flax (fiber from the stalk of a plant), respectively. Ans. Recently, some studies have focused on imparting multifunctional properties alone or in combination with coloration properties of cellulose-containing fabrics in a one-step process. Montazer et al. Dyeing cotton fabric with reactive, direct and vat dyes requires a huge quantity of sodium chloride as an exhausting agent to increase dye uptake and causes serious environmental problems. Schindler, P.J. Shrinkage is an undesirable property of apparel, so in order to manufacture high-quality clothing, shrink-resistant fabric should be used. (2009) have demonstrated the positive effect of pre-cationization of cotton surfaces using 3-chloro-2-hydroxypropyl trimethyl ammonium chloride on enhancing the extent of adsorption of Ag-NPs onto surface of fibers as well as imparting strong antibacterial activity against E. coli bacteria. Copyright © 2021 Elsevier B.V. or its licensors or contributors. $10.95. Application: Small-scale temporary structures, retractable structures, not frequently used. (2004), Vajnhandl and Le Marechal (2005) and Sun et al. For treated silk fabric, the dry and wet crease-recovery angle increased to 267° and 250°, respectively, while for untreated fabric these values were 235° and 178°, respectively [38]. Cotton fabric is padded with this solution for 75–80% expression, dried or covered with polyethylene sheet to avoid oxidation of selvedge and developed in a boiling solution of NaOH (40 g/l) and Na2CO3 (20 g/l) for 30 min, aired, washed in cold and hot water, treated with Na2SiO3 solution (2.5 g/l), washed thoroughly and dried. Lei et al. From: The Impact and Prospects of Green Chemistry for Textile Technology, 2019, In Handbook of UV Degradation and Stabilization (Second Edition), 2015. (1995) and Khatri et al. Much of the stress-induced shrinkage can be eliminated by mechanically compacting the fabric. Inclusion compound of Neomycin sulfate with cyclodextrin is implanted into films of two polymers which have been used to make sutures; polymers are poly (l-lactic acid-PCCA) and poly (caprolactone). It is advisable to avoid over-drying cotton fabrics and remove them from the dryer promptly to prevent wrinkles and shrinkage. To develop brilliancy of shade, dyeings are often topped with either vat olive green B, khaki GG or sulphur khaki dyes. Many researchers have investigated the dyeing behaviour of poly(trimethylene terephthalate) fabric with the use of ultrasound energy (Luo et al., 2002; Wang et al., 2004; Zhu and Cui, 2008). What are the effective wet pickup and the necessary pad concentration? Hauser, in Chemical Finishing of Textiles, 2004. 100% cotton fabrics provide excellent antistatic properties against friction rubbing at relative humidities above 45%, but they generate considerable electric shocks when rubbed below 35% relative humidity. 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