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The invention discloses a method for preparing christobalite nanofiber aerogel based on KOH induction, which comprises the following steps: dissolving KOH in water, adding phosphoric acid to prepare a neutral solution, adding PVP (Polyvinyl Pyrrolidone), stirring to prepare a PVP-containing solution, then adding tetraethyl silicate and phosphoric acid, and continuously stirring to obtain a spinning solution; performing centrifugal spinning on the spinning solution to obtain a micro-nanofiber aerogel precursor, and then putting the micro-nanofiber aerogel precursor into a muffle furnace for high-temperature sintering to obtain the cristobalite nanofiber aerogel. According to the preparation method, potassium ions are doped in raw materials to induce SiO2 nanofibers to form crystal SiO2 fibers, and finally the high-temperature-resistant christobalite nanofiber aerogel material is obtained. The potassium ions can be lost and holes are left at high temperature, the specific surface area is increased, the temperature resistance and the mechanical property of the christobalite aerogel are improved, the christobalite aerogel induced by the single potassium ions shows excellent high-temperature stability, and the temperature resistance of the christobalite aerogel is remarkably improved to 1500 DEG C.
本发明公开了一种基于KOH诱导制备方英石纳米纤维气凝胶的方法，所述方法包括以下步骤：将KOH溶于水中，加入磷酸配成中性溶液，加入PVP，搅拌后，配成含PVP的溶液，然后再加入硅酸四乙酯和磷酸继续搅拌，得到纺丝液；将所述纺丝液进行离心纺丝得到微纳米纤维气凝胶前驱体，然后将微纳米纤维气凝胶前驱体放入马弗炉中进行高温烧结后，得到所述方英石纳米纤维气凝胶。本发明通过在原料中掺杂钾离子诱导SiO2纳米纤维形成晶体SiO2纤维，最终得到耐高温方英石纳米纤维气凝胶材料。高温时钾离子会流失并留下孔洞，增大其比表面积的同时，提升其耐温性与机械性能，这种单一钾离子诱导的方英石气凝胶显示出卓越的高温稳定性，其耐温性能显著提升至1500℃。
The invention discloses a method for preparing christobalite nanofiber aerogel based on KOH induction, which comprises the following steps: dissolving KOH in water, adding phosphoric acid to prepare a neutral solution, adding PVP (Polyvinyl Pyrrolidone), stirring to prepare a PVP-containing solution, then adding tetraethyl silicate and phosphoric acid, and continuously stirring to obtain a spinning solution; performing centrifugal spinning on the spinning solution to obtain a micro-nanofiber aerogel precursor, and then putting the micro-nanofiber aerogel precursor into a muffle furnace for high-temperature sintering to obtain the cristobalite nanofiber aerogel. According to the preparation method, potassium ions are doped in raw materials to induce SiO2 nanofibers to form crystal SiO2 fibers, and finally the high-temperature-resistant christobalite nanofiber aerogel material is obtained. The potassium ions can be lost and holes are left at high temperature, the specific surface area is increased, the temperature resistance and the mechanical property of the christobalite aerogel are improved, the christobalite aerogel induced by the single potassium ions shows excellent high-temperature stability, and the temperature resistance of the christobalite aerogel is remarkably improved to 1500 DEG C.
本发明公开了一种基于KOH诱导制备方英石纳米纤维气凝胶的方法，所述方法包括以下步骤：将KOH溶于水中，加入磷酸配成中性溶液，加入PVP，搅拌后，配成含PVP的溶液，然后再加入硅酸四乙酯和磷酸继续搅拌，得到纺丝液；将所述纺丝液进行离心纺丝得到微纳米纤维气凝胶前驱体，然后将微纳米纤维气凝胶前驱体放入马弗炉中进行高温烧结后，得到所述方英石纳米纤维气凝胶。本发明通过在原料中掺杂钾离子诱导SiO2纳米纤维形成晶体SiO2纤维，最终得到耐高温方英石纳米纤维气凝胶材料。高温时钾离子会流失并留下孔洞，增大其比表面积的同时，提升其耐温性与机械性能，这种单一钾离子诱导的方英石气凝胶显示出卓越的高温稳定性，其耐温性能显著提升至1500℃。
Method for preparing cristobalite nanofiber aerogel based on KOH induction
基于KOH诱导制备方英石纳米纤维气凝胶的方法
ZHOU JIAN (author)
2024-11-29
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
D01F
Chemische Gesichtspunkte bei der Herstellung von produzierten Filamenten, Zwirnen, Fasern, Borsten oder Bändern
,
CHEMICAL FEATURES IN THE MANUFACTURE OF MAN-MADE FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
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