Ultralow density silica aerogels by alcohol supercritical drying

Synthesis of yttrium aluminum garnet (YAG) powder by homogeneous precipitation combined with supercritical carbon dioxide or ethanol fluid drying

“…[33][34][35][36][37][38][39][40] appear when calcined at 900 • C. Further calcining at higher temperatures leads to the enhancement in the YAG diffraction peak intensity and reduces in the full-width at the half-maximum due to the improvement of crystallization and grain growth. Fig.…”

“…Therefore, supercritical fluid drying technique has been developed and successfully used for nanostructure fabrication such as TiO 2 and silica aerogels. 33,34 In this study, for the first time, YAG precursor powders were synthesized by homogeneous precipitation combined with supercritical CO 2 and ethanol fluid drying technique, respectively. For comparison, conventional drying method in air at room temperature was also used.…”

Super‐Compressibility of Ultralow‐Density Nanoporous Silica

“…Successful synthesis of ultralow-density [4] silica AGs has also been reported. [5][6][7] Ultralow-density nanofoams are currently of interest for thermonuclear fusion energy applications as scaffolds for condensed hydrogen fuel layers in fusion targets. [8] They are also attractive materials for solid-state targets for ultrabright x-ray lasers, [9] energy absorbing structures, [10] compliant electrical contacts, [11] and electromechanical devices.…”

Surface modifiers on the waterglass aerogels prepared by ambient drying process

“…실리카 에어로젤(Silica aerogel)은 3차원의 망목구조를 가진 현존하는 물질 중에 가장 높은 기공률과(~90 %), 저밀도(3~120 mg/cm 3 ), 저굴절률(~1.01), 저음속도(100 m/s), 고비표면적(≥700 m 2 /g), 저유전율(~1.1) 그리고 매우 작은 열전도도(~0.01 W/K·m)의 물성을 가진 고 체로서 이러한 망목기공구조에 의하여 특이한 물리적 성질을 가진다 [1,2] . 이러한 물리적 성질의 에어로젤은 투명단열재(transluscent insulation material: TIM) 및 태양열 난방시스템, 촉매의 담체, 절연막 등 에너지·환 경·전기전자 분야의 무한한 응용 가능성을 가진 소재이 다.…”