Aerogels for thermal insulation in high-performance textiles

Nanocellulose aerogel-based porous coaxial fibers for thermal insulation

“…The CNF aerogel core within hollow fiber further inhibits the thermal transfer mechanism in several ways. The large 10 1 -10 2 μm cellular spacings in CNF aerogel inhibit convection by restraining air circulation in over 99.5% pore volume [14,15,17], while permitting heat transfer by the poor thermal conducting and irregularly connected cellular walls whose highly crystallinity prohibit infrared radiation effectively in comparison to the optically transparent polymer films or silica aerogels [8]. Clearly, the porous sheath of the hollow fiber surrounding the CNF aerogel core serves several crucial structural roles by providing the internal space and compatible surfaces for infilling aqueous CNF aerogel precursor; the mutliscale pore structure of the sheath allows water vapor diffusivity for aerogel formation; and the protective outer layer for handling.…”

“…While the most studied and commercially available aerogels are silica aerogels, significant interest has extended to others based on carbon, organic materials, metals and metal oxides [1][2][3][4][5][6]. However, aerogels are typically low tensile strength and Young's modulus, making them friable to be handled and used alone [7,8]. Being able to shape aerogels into desired forms and dimensions is attractive from the standpoint of integrating aerogels with other materials for strength and easy handle.…”

“…1c and d), thus having a very high aspect ratio and specific surface. Furthermore, these CNF surfaces are amphiphilic, allowing their self-assembling into unique aerogels of super low density (2-8 mg cm À 3 ), ultra-high porosity (>99.5%), high specific surface area (123 m 2 g À 1 ) with a 0.37 cm 3 g -1 pore volume, and wet-resilience while retaining amphiphilicity [8,14,15,[17][18][19][20]. Thermal insulation is among many of the diverse potential applications of these CNF aerogels.…”

White Light Emission from a Simple Mixture of Fluorescent Organic Compounds

“…Aerogels offer high porosity (nanometer-scale pore sizes), they are lightweight materials with low densities (0.003–0.15 kg/m 3 ) and large surface areas (500–1000 m 2 /g) 49,50 . Such properties mean that aerogel has great potential for use in a wide range of applications, including thermal insulation 51 , electrochemical applications (e.g., super capacitors) 52 , materials for tissue engineering 53 , bio-sensors 54 , amongst several others. In this work, we tested two commercially available aerogel variants: dry hydrophilic and dry hydrophobic silica aerogel.…”

Fear and Loathing in Colorado: Invoking the Supreme Court's State-Controversy Jurisdiction to Challenge the Marijuana-Legalization Experiment

“…320 The drug is the most lucrative commercial crop in the United States. 321 This guarantees that "the high demand in the interstate market will draw marijuana" acquired intrastate "into that market" and will thereby have "a substantial effect on supply and demand in the national market for that commodity." 322 The CSA thus establishes that Colorado's pot market constitutes a significant health threat to neighboring states.…”