Effect of heat treatment on hydrophobic silica aerogel.

In-situ immobilization of ZIF-67 on wood aerogel for effective removal of tetracycline from water

Construction of multifunctional and flame retardant separator towards stable lithium-sulfur batteries with high safety

In recent times, increasing environmental pollution alongside depletion of fossil fuel reserves has led to a rejuvenated interest in utilizing biomass and waste materials. Advanced porous carbons derived from such...

Recent Advancement of Biomass-derived Porous Carbon Based Materials for Energy and Environmental Remediation Applications

Surface and interface modification of aramid fiber and its reinforcement for polymer composites: A review

Nanoporous SiO2 grafted aramid fibers with low thermal conductivity

Self S-doping activated carbon derived from lignin-based pitch for removal of gaseous benzene

The invention discloses a device for weakening the rarefaction wave of a hydrogen-oxygen detonation shock tube, which includes a detonation driving section, a transition section, a driven section, a diaphragm and a baffle. The detonation driving section, the transition section and the driven section are connected in sequence. The diaphragm is arranged at the joint of the detonation driving section and the transition section. The baffle is arranged at the joint of the transition section and the driven section. The upper end of the baffle is hinged to the pipe of the transition section or of the driven section. After the incident shock wave formed by the detonation driving section breaks the diaphragm, the baffle is lifted up to allow the incident shock wave to pass and be propagated to the driven section. Part of the incident shock wave is reflected by the baffle and interferes with rarefaction wave, so that the attenuation effect of the rarefaction wave on the incident shock wave is weakened, and the steady flow time of the incident shock wave is prolonged. After the incident shock wave passes through the baffle, the baffle is closed again under the action of gravity. The invention further provides a method for weakening the rarefaction wave of a hydrogen-oxygen detonation shock tube. Through the device and the method, the rarefaction wave of a hydrogen-oxygen detonation shock tube can be weakened, and the steady gas flow used in experimental study can exist longer.

Device and method for weakening rarefaction wave of hydrogen-oxygen detonation shock tube

The invention relates to a supercritical drying preparation method for a silicon dioxide aerogel heat-insulation material. The method comprises the following steps: 1) diluting a water glass solution by using a certain amount of deionized water; 2) slowly adding the diluted water glass solution into a concentrated hydrochloric acid solution, and performing uniform mixing under continuous stirring, so as to obtain a highly-acidic silica sol; 3) performing rotary evaporation on the acidic silica sol solution to evaporate off partial water, taking out the processed sol, adding a water-soluble polar solvent with a low surface tension, performing uniform mixing with stirring, and then adding the diluted water glass solution to adjust the pH of the formed solution, so as to form a gel; and 4) adding a water-soluble polar solvent into the gel for aging and gelation, then putting the obtained wet gel in an extraction kettle, enabling the kettle to have a high-pressure internal environment and to be sealed, introducing supercritical CO2, contacting CO2 with the wet gel, and performing extraction and drying. The preparation method has the beneficial effects that the technology can be finished within a half day.

Guoxiang Sun

Papers

Nanoporous SiO2 grafted aramid fibers with low thermal conductivity

Self S-doping activated carbon derived from lignin-based pitch for removal of gaseous benzene

Device and method for weakening rarefaction wave of hydrogen-oxygen detonation shock tube

Supercritical drying preparation method for silicon dioxide aerogel heat-insulation material