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First Prize Of Textile Natural Science! Let The Flag On The Moon And The Glacier "Cool Down"
The 2024 Science and Technology Award of China Textile Industry Federation was announced recently. The project of "Principles and Applications of Radiation Regulation Based on Fiber Aggregates" jointly completed by Professor Zhu Jia, Dean of the School of Energy and Resources of Nanjing University, as the first person to complete the project with Wuhan Textile University and Changchun Institute of Optics, Precision Mechanics and Physics of the Chinese Academy of Sciences, won the first prize of the Natural Science Award of the Science and Technology Award of the China Textile Industry Federation.
Fiber materials play a key role in textile construction, energy and environmental protection, aerospace and many other fields. Among them, radiation characteristics, as one of the important properties of fiber materials, directly determine their optical and thermal properties, and significantly affect their application performance and service life. However, the influence of fiber structural components on radiation characteristics is not clear at present, and radiation control means and fiber construction methods are limited, which restricts the functionalization of fiber materials and their development and application. The project starts from the research on the precise regulation of fiber material hierarchical structure on broad spectrum (sunlight and infrared) radiation, and establishes a scientific mechanism for radiation regulation of fiber aggregates based on hierarchical structure; By coupling the advanced textile processing technology with the multi-scale fiber hierarchical structure micro nano processing technology controlled by broad spectrum radiation, the preparation strategy of the fiber assembly accurately controlled by broad spectrum radiation was proposed and realized; Focusing on the multi scene application requirements under the strong solar radiation environment, we took the lead in using the radiant refrigeration fiber assembly for glacier protection and the "fabric version" of the lunar flag, led and promoted the multi scene application of fiber materials, and published more than 100 papers in Nature, Science series journals, etc.
The spectral radiation control mechanism of fiber materials has been established
By analyzing the physical and chemical structure characteristics of different fiber materials, the influence of the organizational structure of fibers and their aggregates on the radiation properties is deeply analyzed, and the transmission, reflection and absorption behaviors of light in the multi-layer fiber assemblies are clarified, and a theoretical model of radiation intensity attenuation suitable for different fabric organizational structures is established. By revealing the temperature distribution law and infrared utilization efficiency inside the fiber materials and fabrics, the quantitative evaluation of the inherent attribute of infrared utilization efficiency of different fabrics is realized, and the mechanism of the influence of radiation on the temperature of textile fibers and fabrics is systematically expounded. The influence of fiber material hierarchical structure and material composition on the absorption and reflection of broad band light was found, and the theoretical model of precise regulation of solar and infrared radiation was proposed. The scientific mechanism of fiber radiation temperature control based on hierarchical structure was clarified, which provided a new idea for the design of wide band selective radiation cooling fiber.
Designed and constructed a fiber assembly controlled by broad spectrum radiation
The optical performance enhancement design for natural fibers and the wide spectrum precision design for synthetic fibers are proposed. Based on the correlation mechanism between the optical properties of natural silk fibers and the internal layered microstructure, the project proposes a spectrum regulation and enhancement strategy of surface nanocrystallization to achieve high reflectivity and UV resistance in the overall solar band, and achieve the sub environment temperature under the sun (lower than the environment temperature~3.5 ° C). On this basis, a dip coating processing method assisted by molecular bonding design and scalable coupling reagent was proposed, which combined the traditional textile processing technology of nano and screen printing to provide a feasible scheme for the batch preparation of nano silk fabrics, and took the lead in realizing daytime radiation cooling silk below ambient temperature, This provides a new idea for the development and application of radiation refrigeration materials based on natural fibers. Based on the micro nano macro cross scale design, a large-scale selective emission radiation control fiber assembly was proposed. Through the collaborative hierarchical design of molecular bonds and micro nano structures, the reflection efficiency (96.3%) in the solar band and the selective emissivity (78%) in the infrared band (8-13 μ m) were achieved. The project thus developed an improved roll to roll artificial fiber spinning method, realized the construction of a full chain system of wide spectrum and precise regulation fiber assembly, and provided technical support for the large-scale application of radiation temperature control synthetic fiber assembly.
Developed multi scene application of radiation temperature control fiber assembly
The energy flow regulation and temperature balance mechanism of multi-component fiber materials under strong sunlight irradiation in multiple scenarios were found. Starting from the color construction and optical behavior of the surface structure and body of fiber materials, based on the precise control strategy of broad spectrum radiation of fiber materials, and using the synergistic effect of silk fibroin micro nano particles and pigment particles, a lunar flag that can withstand high dose ultraviolet radiation and high and low temperature cycles was developed and successfully displayed on the lunar surface on December 4, 2020, The Chinese probe was marked with a "Chinese logo" on the moon. Against the background of global warming, glaciers are melting with the naked eye. The project is designed to build a radiation cooling fiber fabric, which has paved the glacier with new quality "armor". By reducing the external energy intake, enhancing the surface albedo, and enhancing the energy emission of its own mid infrared window, the glacier ablation can be slowed down. It has the advantages of zero energy consumption, thin, hydrophobic, not easily polluted, and reusable. For the first time, the project used fiber based radiation cooling new materials in the Abadagu Glacier in Sichuan Province, and carried out large-scale field experiments on glacier protection, effectively slowing down the melting speed of local glaciers, which was highly recognized by the Glacier Authority.
"At present, the radiation cooling fiber products designed under the background of the project have been successfully verified in the field of snow and ice protection and the moon flag. Next, our goal will be to promote to the fields of clothing, outdoor fabrics, etc.". Zhu Jia is full of confidence in the future.
(Source: Textile and Clothing Weekly)
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