Visible‐near infrared concealment of cotton/nylon fabrics using colored pigments and multiwalled carbon nanotube particles (MWCNTs)

Abstract

To match the reflectance profile of desert colors including dark brown, light brown and olive green in the visible-near IR (Vis-NIR) bands, five selected colored pigments were utilized to print woven cotton/nylon fabrics. Multi-walled carbon nanotube particles (MWCNT's) were also added to some of the printing pastes. The reflectance of printed fabrics was evaluated by using spectrophotometric technique. The effect of adding MWCNT's, on washing; light and crocking fastness alongside with colorimetric values of printed samples was evaluated. Furthermore, the water absorption time was measured in order to determine wettability of each printed sample. The results demonstrated that the presence of MWCNT's in concentration range of 0.04-0.12 g kg 21 in printing formulations was found to cause considerable decline in Near Infrared (NIR) reflectance while a surprising increase in visible reflectance of samples was observed. Color characteristics of printed fabrics were noticeably changed even at concentrations as low as 0.12 g kg 21 MWCNTs in printing formulations. Presence of MWCNTs in printing formulations was found to cause a significant increase in wetting time of samples. Also, the results indicated that air permeability of printed samples containing MWCNT's were higher than samples printed with no MWCNTs. Phenomena imposed by MWCNT's presence on pigment printed samples showed very good fastness levels in crocking, washing and light fastness tests. In dark brown sample, adding MWCNTs to the pigment printing pastes could tune the overall reflectance in order to match the standard reflectance profile accepted for use in concealment color of desert areas. V C 2013 Wiley Periodicals, Inc. Col Res Appl, 40, 93-98, 2015;

Smart Textiles for Visible and IR Camouflage Application: State-of-the-Art and Microfabrication Path Forward

“…Consequently, the authors suggest adding a low concentration of CB nanoparticles (0.05 g/kg of printing paste) for visible and NIR concealment. Similar results were achieved when Khajeh Mehrizi et al added multiwalled carbon nanotube particles (MWCNTs) with a concentration range of 0.04–0.12 g kg −1 to the printing paste applied to 50% cotton/50% nylon fabric [ 14 ]. The addition of MWCNTs lowered the NIR reflectance values of the dark brown, light brown and olive printed fabrics while also increasing the visible reflectance of the samples.…”

“…The work of many researchers demonstrates the importance of wearer comfort, resistance to laundering, and maintaining the functionality of the garment over time [ 14 , 16 , 23 , 31 , 34 , 39 , 40 , 44 ]. There are benefits in avoiding the need for embedded electronics as this adds complexity in terms of washing and powering of devices, especially since energy harvesting capabilities are not ready for use in textile systems yet.…”

Polymer-Encapsulated Colorful Al Pigments with High NIR and UV Reflectance and Their Application in Textiles

“…The solar radiation consists of 5% ultraviolet radiation, 46% visible radiation, and 49% near-infrared radiation (750–2500 nm). , Obviously, the near-infrared (NIR) rays in the solar spectrum are mainly responsible for heat build-up in the environment, especially in the regions of the world that experience extremely high temperatures. , Also, the ultraviolet rays (UVA 400–320 nm, UVB 320–290 nm) cause erythema and skin burns, which inhibits skin tanning ordinarily responsible for skin cancer and aging. , Taking into account the deleterious effect of the solar radiation to human health and well-being, it has become very crucial to develop multifunctional materials that can inhibit or minimize the effect of NIR and ultraviolet (UV) rays in order to maintain the body’s health.…”

Thermal Radiations Mitigation and Stealth using Egyptians Cotton Fabrics Treated with ZnO Nanoparticles and Chlorophyll

“…The effect of camouflaging and how background emissivity affects the camouflage mechanism of dyed cotton fabrics near-IR was described [7]. Materials to camouflage textiles to be used in VIS-NIR include conventional textile dyes such as vat [8], disperse [9], sulfur and acid dyes [10], and pigments [11]. It was suggested that NIR camouflaging could be achieved by dyeing with more than four colors rather than a single color.An evaluation of a combination of dyeing, dyeing concentration and reflectance with respectto weave of the fabric was pointed out [12].…”