2019 Airgel latest research results carding
Airgel, also known as dry gel. When the gel off most of the solvent, the gel content is much less than in the liquid content of the solids, or gel spatial network structure is filled with a gas medium, as a solid appearance. As the world\’s lightest solid, it has been selected for the Guinness Book of World Records. This new material density of only 3.55 kg per cubic meter, is only 2.75 times the density of air; dried pine density (500 kg per cubic meter) it is 140 times. Airgel is now utilized in many fields. As the heat insulating material effective to infrared radiation through the sunlight, and prevent the ambient temperature, an ideal transparent insulation materials, and the use of solar energy in building energy conservation has been applied. Since the quantum dot nano-structure network silicon aerogels, a Si-doped chemical vapor infiltration and a solution method in terms of the energy storage device C60 mixed results show that the dopant is present in the form of nanocrystalline grains, it was observed strong visible light emission, provides strong evidence for the emission quantum confinement effect of porous silicon. You can also make spacesuits, bulletproof functions, processing ecological disaster. Dec. 3 news, millet goods shelves have a spill-resistant thermal wind airgel jacket, black & boasts warm. It can be isolated from the cold temperature and high temperature. Seemingly \”fragile\”, in fact, served with thick plume has the same lock warming effect. As the darling of the material world, airgel has been widely studied by scholars. Research multifaceted. This is a list of the latest research results of recent research teams domestic colleges and universities. Details are as follows:
1, programmable lightweight airgel magnetic!
Recently, Xie from the Beijing University of Aeronautics and Astronautics, Chen Ziyu and the University of Colorado at Boulder research team led by Ivan Smalyukh cooperation programmable magnetic ultra-light airgel prepared, is expected for aerospace vehicles and intelligent field devices, thereby reducing the quality of the device, to reduce operating costs, while the device and the remote non-contact interaction.
The ferromagnetic nanoparticles are uniformly dispersed in the airgel precursor solution, and applying a uniform magnetic field the ferromagnetic particles have the same orientation of magnetization, wait solution was gradually solidified, the tight binding ferromagnetic particles in the network structure, so as to maintain a consistent magnetization direction, and finally through the critical drying to obtain a density of only 0.12Magnetic lightweight airgel kg m-3 – that is, an \”air magnet\” (aero-magnet). Lightweight materials and programmable nature of these domains, the development of \”air magnet\” also has good heat insulating properties and hydrophobicity, it can be applied to the vacuum, low-temperature environment space, and the potential field of energy-saving materials.
2-second stretchable airgel to achieve the lyotropic shape memory effect
is a shape memory material capable of autonomous novel intelligent material changes its shape changes in the external environment; and a shape memory material lyotropic its non-heating mode in response to further broaden the scope of application of shape memory material. Nanjing College of Engineering Professor Wang Chun and advocate Nanjing University professor should thirty-nine using polycaprolactone (PCL) / graphene oxide (GO) of a mixed solution of the sol – gel transition with the formation of self-assembled graphene oxide rules micron circle aerogels cell structure. The cell structure This rule gives airgel high stretchability. The cells in the airgel consists of interconnected sheet polycaprolactone nanoscale. Polycaprolactone nanosheet under action of ethyl acetate, quickly produce wrinkles, thereby to achieve the airgel lyotropic second stage shape memory effect. A new type of stretchable poly (caprolactone) / graphene oxide (PCL / GO) aerogel with fast chemo-responsive shape memory effect is fabricated by one-step method of a sol-gel procedure. The PCL / GO aerogels show uniformly circular and interconnected pores formed by twisted PCL nanolayers. GO platelets improve the crystallinity of PCL and increase the fracture stress and strain by 150% and 300% respectively, although the GO loading is only 0.5%. The dramatic increment of break strain is attributed to the uniform and circular pores that can afford large deformation and the interaction of GO and PCL. The aerogels can be programmed by external stress at ambient temperature without heating and recover upon ethyl acetate (EA) in 1 s. The fast chemo-responsive shape recovery is ascribed to the fast wrinkle of the PCL nanolayers that decrease the diffusion time greatly and the interconnected micrometer pores that are in favor of penetrating for EA molecules Related PDF document: Fast Chemo-Responsive Shape Memory of Stretchable Polymer Nanocomposite aerogels Fabricated by One-Step Method
3, ZnO-ZrO2 airgel high activity for the hydrogenation of aromatics CO2
is generally believed that the mixed oxide surface oxygen vacancies play an important role in the adsorption and activation with CO2. The oxygen vacancies may be formed or the processing method of doping heteroatom facilitated by partial reduction. Research Professor Ha wild kingBinding group synthesized by sol-gel method and a supercritical drying method ZnO-ZrO2 airgel having a high specific surface, the specific surface area remains 124 m2 g-1 at 500 degrees Celsius after calcination, is significantly higher than the reported ZnO -ZrO2 mixed oxide specific surface area (about 50 m2 g-1). After the supercritical drying method, ae-ZnO-ZrO2 can reach a specific surface area 471 m2 g-1. found a supercritical drying method to obtain the ZnO-ZrO2 airgel, having a high specific surface area and high oxygen vacancy density, and density of oxygen vacancy formation rate is linear intermediate methanol, oxygen vacancies was confirmed to CO2 adsorption activated sites. Research focused on CO2 bifunctional catalytic system space-time yield is low aromatics hydrogenation process, designed and synthesized small particle size, high surface area, high oxygen vacancy content of ZnO-ZrO2 airgel activated as a component of CO2, after coupling H-ZSM-5 zeolite significantly increases the space-time yield of aromatics.
4, no high-capacity negative electrode of metal lithium dendrite MXene / graphene aerogels
DICP dimensional material and energy device Study Group (DNL21T3) Wuzhong Shuai researchers team developed a three-dimensional highly conductive, affinity of lithium MXene / graphene porous airgel new materials, and lithium used in high loading, high capacity, metal lithium dendrite-free negative electrode, a high specific energy, long-life lithium metal battery. Team developed a three-dimensional MXene / graphene porous airgel material, lithium metal and used as the carrier, the flexible successfully constructed, a high lithium loading (3560 mAh g-1) a lithium metal anode composite. D MXene / graphene airgel material having a high surface area (259 m2 g-1), is excellent in conductivity, good affinity lithium performance, achieves a high coulombic efficiency (99%), significantly improved lithium metal cycling stability of the negative electrode (2700 h), much higher than the values reported in the current literature. Research results published in the \”American Chemical Society · nano\” (ACS Nano).
5, zero shrink graphene airgel thin light absorbing material
Recently, East China University Fan Chi Yu, Wang Lianjun groupA team reported in ethanol as solvent, 3-aminopropyl triethoxysilane (the APTES) as the surface modifier as well as a new method of preparing a graphene airgel crosslinking agent, to avoid the conventional method of producing graphite volume shrinkage problems arise alkenyl aerogels, and to achieve precise control of the density, absorbing performance can be regulated by adjusting the concentration of graphene oxide. at K-band, the thickness of only 1.14 mm, the reflection loss reaches -50.3 dB, in addition, after the introduction of the magnetic core-shell structure Fe3O4 @ C, can further enhance the absorbing performance, Fe3O4 @ C / GA minimum reflection loss is – 54 dB, the thickness of only 0.99mm, to achieve a controllable density, light weight, strong absorption advantages. Work related to \”Ultrathin and Lightweight Graphene Aerogel with Precisely Tunable Density for Highly Efficient Microwave Absorbing\” was published in the internationally renowned journal \”ACS Applied Materials & Interfaces\”. Section PDF: Ultrathin and Lightweight Graphene Aerogel with this novel density Precisely Tunable Density for Highly Efficient Microwave Absorbing controlled graphene airgel material will provide a reference design preparation 5G communications equipment advanced radar absorbing materials.
6, CNT aerogels – stable and efficient oxygen reduction catalyst
A three-dimensional nitrogen-doped carbon nanotubes (N-CNT) Airgel Catalyst Wuhan University of Science Zhou PCG team prepared for stably efficient catalytic ORR. Team polypyrrole as precursor, convenient \”in situ\” doping strategy, pyrolysis treatment at different annealing temperatures (500, 700, 900, 1050oC) to give N-CNT airgel. Characterized by a series of known, due to their high degree of graphitization and a suitable nitrogen-doped configuration, PPy / C-1050 TableORR activity and exhibit excellent anti-decay properties, decay accelerating cycle test after 1500 times higher than the half-wave potential commercial 20 wt.% Pt / C catalyst 20 mV, the activity retention rate also significantly increased (93.0% vs. 81.1%). The design and control of non-precious metal work ORR catalyst provides a new way of thinking. PDF documents: CNT aerogels