Aerogel is a three-dimensional nano-porous solid material prepared by combining the sol-gel method with supercritical drying (or new type of atmospheric drying) technology. Its porosity is over 90%, and the proportion of air exceeds 90%. It has extremely low thermal conductivity, extremely high specific surface area, excellent acoustic properties, and functional designability. As a new type of functional material that combines lightweight and high performance, aerogel can serve as a cutting-edge material that breaks through the performance limits of traditional materials, as well as an advanced functional material that requires precise control of the preparation process. 
Currently, aerogel is gradually evolving into a strategically significant new material and has achieved substantial application results in multiple fields. In the field of building energy conservation, aerogel, with its outstanding performance, is becoming a key driving force for the green and low-carbon transformation and innovative development of the construction industry, deeply responding to the core requirements of the Ministry of Housing and Urban-Rural Development to build "good houses". In terms of insulation and heat preservation of building envelopes, sound insulation and noise reduction of indoor spaces, as well as addressing challenges in extreme climate environments, aerogel demonstrates irreplaceable advantages. 
In the field of innovative environmental materials, bio-based aerogels have redefined the green standards for building materials due to their degradable characteristics throughout their entire lifecycle. Cellulose-based aerogels are produced using agricultural and forestry waste as raw materials, and their production energy consumption is significantly lower compared to traditional silica aerogels. Chitosan-based aerogels are derived from biological waste such as shrimp and crab shells and can be fully degraded by microorganisms within several months. When these materials are made into sound-absorbing panels and applied in libraries and theaters, not only is the high value of waste materials realized, but a quiet acoustic space is also created. 
The intelligent response aerogel endows the building's surface with the "smart perception" capability. The temperature-controlled aerogel incorporates phase change materials. In summer, it automatically absorbs heat to reduce the thermal conductivity, and in winter, it solidifies and releases heat to maintain the indoor temperature. The photosensitive aerogel is equipped with photochromic materials. Under strong light, it blocks ultraviolet rays, and on cloudy days, the light transmittance increases, achieving a dynamic balance between lighting and heat insulation. 
The revolutionary breakthrough in the manufacturing process is accelerating the transition of aerogels from the laboratory to large-scale applications. The 3D printing technology with a precision of 10 μm can not only create relief decorations with both artistic beauty and insulation and soundproofing functions, but also customize concrete nodes with gradient pore structures to reduce heat conduction losses. The green synthesis process replaces organic solvents with water-based sol-gel systems, not only eliminating volatile pollution but also reducing the preparation energy consumption, thereby lowering the cost of aerogel insulation mats. Currently, in terms of industrial application, aerogels have demonstrated some breakthroughs. Currently, products such as silica aerogel insulation mats for building insulation and insulation sheets for new energy vehicle battery packs have achieved mass production at the tens of thousands of tons level. 
At polar research stations, aerogel sandwich panels resist the -50℃ cold with an extremely low thermal conductivity. In desert ecological buildings, aerogel reflective coatings lower indoor temperatures and reduce air conditioning energy consumption. With technological advancements and cost optimization, aerogel is moving from extreme environments to daily life projects, enhancing energy efficiency in affordable housing and improving living quality in old residential areas. In the future, aerogel is expected to become the core engine for the green transformation of the construction industry, driving a comprehensive upgrade of the living environment through material innovation. 
In the field of new energy industries, aerogels are used in lithium battery fireproof and heat-insulating aerogel sheets, hydrogen fuel cell bipolar plate insulation layers, and photovoltaic panel backsheet encapsulation materials; in the aerospace and high-end equipment fields, aerogels can be used as the thermal protection layer of spacecraft and ultra-light satellite structural materials; in the gas adsorption and purification field, adsorption materials represented by silica aerogels exhibit outstanding performance. They not only can efficiently adsorb gaseous pollutants such as carbon dioxide and volatile organic compounds, but also have good application potential in water purification. 
By adhering to the principles of efficient resource utilization and minimizing pollution, aerogels not only achieve the recycling of waste materials but also effectively reduce the consumption of natural resources. In the future, their collaborative application in extreme environments and large-scale civilian scenarios will further unleash their economic and environmental benefits.