Preparation and performance characterization of all-weather passive radiation warming fabrics
In cold environments,it is critical to maintain a stable body temperature.The most common way for people to regulate their body temperature is to utilize traditional heating devices such as air conditioners and fossil fuels.However,most of the energy for these methods is concentrated in vast spaces and inside inanimate buildings,which causes great energy waste and environmental pollution.According to statistics,the heating/cooling system of building air-conditioning accounts for about 20%of the total global indoor electricity consumption,while greenhouse gas emissions account for more than 10%of global greenhouse gas emissions.Therefore,the development of efficient,green and energy-saving heating materials is of great significance for human beings to withstand harsh climatic conditions.As a result,personal thermal management,which focuses on the micro-environment around the human body to achieve precise localized thermal regulation,is emerging as an energy-efficient and highly effective way to keep warm.In the field of personal thermal management,the research on radiation modulation is gradually coming to the fore,and its uniquely passive and efficient characteristics have attracted much attention in the current social context of pursuing energy conservation and environmental protection.This technology realizes the goal of keeping the human body warm by finely modulating the two bands of solar spectrum(0.3-2.5 μm)and human body radiation(7-13 μm),fully demonstrating its great application potential and value.Cotton is one of the most common textiles used in daily life and is widely used in the production of thermally wearable products due to its naturally curled and hollow microstructure and its comfort to human skin.However,the inherent low light energy conservation of natural cotton in terms of mid-infrared radiation from the human body and the solar spectrum prevents it from realizing efficient thermal insulation.This paper employs a simple technique to assist the silver ion deposition effect with the aid of polydopamine(PDA)using cotton fabrics as a substrate,thus allowing silver nanoparticles to be uniformly and firmly attached to the surface of cotton fibers.The combined effect of nanoparticles and plasma near-field coupling effect results in modified fabrics with excellent human infrared reflection and high solar absorption properties.Compared with unmodified cotton fabrics,the modified fabrics show a significant improvement in warmth retention effect,providing a new solution for the warmth retention of textiles.This paper,we investigated the changes in morphology and chemical structure of cotton fabrics before and after modification.Based on this,we further explored the effects of polydopamine(PDA)and silver nitrate concentration on the radiative warmth properties of the modified fabrics,aiming to find the optimal process parameters to optimize the warmth effect of the fabrics.After determining the optimal experimental parameters,we comprehensively characterized the thermal management performance of the modified fabrics in different environments to ensure that they can demonstrate the warmth-retaining ability in various practical application scenarios.In addition,in order to ensure that the modified fabrics not only have excellent warmth-retaining properties,the wearing performance of the fabrics before and after the modification was also evaluated to confirm that they can meet the users'daily use requirements.The results show that the density of nanoparticles on the surface of the modified fabrics exhibited a significant growth trend with the increase of the concentration of PDA and silver nitrate solution.When the concentrations of PDA and silver nitrate were set to 0.2%and 1.2%,respectively,the surface of the cotton fabric was uniformly and tightly covered by the nanoparticles,and the modified fabrics in this state exhibited excellent thermal management performance and achieved optimal warmth.Due to the synergistic effect of silver nanoparticles and PDA,the reflectance of the modified cotton fabric to the peak of the solar spectrum was reduced from 73.54%to 15.76%,and the reflectance to the infrared radiation of human body was increased to 43.18%.In the indoor environment,due to the high reflectivity of the modified fabric to the human body infrared,the temperature of its inner layer was increased by1.1℃compared with that of the ordinary cotton fabric;in the sunlight irradiation conditions,the body temperature could be increased by about 6℃through the high absorbency of the modified fabric to the solar spectrum.It is worth mentioning that despite the modified treatment,the cotton fabric still maintained excellent air permeability,moisture permeability and mechanical properties.In addition,the spectral properties were not significantly affected after several washing cycles,which further demonstrated the stability and durability of the modified fabrics in practical applications.
personal thermal managementradiant warmthfunctional textilescotton fabricsphotothermal conversionoutdoor textiles
万方数据
维普
