{"title":"硅钨酸插层zno - ldhs纳米片支撑CNF气凝胶增强隔热和阻燃性能","authors":"Liping Yuan, Yi Sun, Yuanbo Wu, Jiajing Yu, Shiyan Zhang, Youhua Fan, Jianzheng Qiao","doi":"10.1007/s10570-025-06735-0","DOIUrl":null,"url":null,"abstract":"<div><p>Lightweight, heat-insulating, and high-temperature-resistant materials are essential for the safety of spacecraft and precision equipment. Nanocellulose (CNF), with their high specific surface area, low thermal expansion coefficient, and high strength, hold promising prospects for lightweight and thermally insulating aerospace materials. However, the inherent flammability and high brittleness of CNF severely limit their widespread use in high-temperature fields. To address these issues, this study successfully synthesizes [SiW<sub>12</sub>O<sub>40</sub>]<sup>4−</sup>-intercalated ZnAl-SiW<sub>12</sub>O<sub>40</sub>-LDHs (SiW-LDHs) and incorporates them into CNF with boric acid (BA) to prepare SiW-LDHs + BA/CNF aerogels. Results show that LDHs can be uniformly distributed within the porous network of CNF aerogels, and the CNF-based aerogel had a unique combination of lightweight construction, an exceptionally low density of the 50.0SiW-LDHs + BA/CNF aerogel is 0.0154 g/cm<sup>3</sup>, when the mass fractions of SiW-LDHs and BA were 50.0% and 2.0% of CNF, respectively. This aerogel exhibits excellent thermal insulation and flame-retardant performance with a low thermal conductivity of 0.038 W/(m·K), and the t<sub>250°C</sub> (time required for the central temperature on the backside of the aerogel to reach 250 °C from room temperature) was 2237.6 s, 1082.6 s longer than that of pristine CNF aerogel. Specifically, the 50.0SiW-LDHs + BA/CNF aerogel did not ignite during the 70 s of exposure to flame. The compressive strength and specific modulus after the impact the 50.0SiW-LDHs + BA/CNF aerogel were increased by a maximum of 255.0% and 118.0% compared to pristine CNF. From the analysis of the combustion residues, multiple fire-retardant mechanisms are generated during the combustion of SiW-LDHs + BA/CNF aerogel, which can be included as catalytic charring, condensed and gas-phase functions. This work provided a facile strategy to fabricate a multifunctional CNF nanocomposite, making them hold great potential for application in aerospace and high-temperature thermal protection fields.</p><h3>Graphic Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":511,"journal":{"name":"Cellulose","volume":"32 14","pages":"8201 - 8220"},"PeriodicalIF":4.8000,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Silicotungstic acid-intercalated ZnAl-LDHs nanosheets-supported CNF aerogels for enhanced thermal insulation and flame retardant\",\"authors\":\"Liping Yuan, Yi Sun, Yuanbo Wu, Jiajing Yu, Shiyan Zhang, Youhua Fan, Jianzheng Qiao\",\"doi\":\"10.1007/s10570-025-06735-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Lightweight, heat-insulating, and high-temperature-resistant materials are essential for the safety of spacecraft and precision equipment. Nanocellulose (CNF), with their high specific surface area, low thermal expansion coefficient, and high strength, hold promising prospects for lightweight and thermally insulating aerospace materials. However, the inherent flammability and high brittleness of CNF severely limit their widespread use in high-temperature fields. To address these issues, this study successfully synthesizes [SiW<sub>12</sub>O<sub>40</sub>]<sup>4−</sup>-intercalated ZnAl-SiW<sub>12</sub>O<sub>40</sub>-LDHs (SiW-LDHs) and incorporates them into CNF with boric acid (BA) to prepare SiW-LDHs + BA/CNF aerogels. Results show that LDHs can be uniformly distributed within the porous network of CNF aerogels, and the CNF-based aerogel had a unique combination of lightweight construction, an exceptionally low density of the 50.0SiW-LDHs + BA/CNF aerogel is 0.0154 g/cm<sup>3</sup>, when the mass fractions of SiW-LDHs and BA were 50.0% and 2.0% of CNF, respectively. This aerogel exhibits excellent thermal insulation and flame-retardant performance with a low thermal conductivity of 0.038 W/(m·K), and the t<sub>250°C</sub> (time required for the central temperature on the backside of the aerogel to reach 250 °C from room temperature) was 2237.6 s, 1082.6 s longer than that of pristine CNF aerogel. Specifically, the 50.0SiW-LDHs + BA/CNF aerogel did not ignite during the 70 s of exposure to flame. The compressive strength and specific modulus after the impact the 50.0SiW-LDHs + BA/CNF aerogel were increased by a maximum of 255.0% and 118.0% compared to pristine CNF. From the analysis of the combustion residues, multiple fire-retardant mechanisms are generated during the combustion of SiW-LDHs + BA/CNF aerogel, which can be included as catalytic charring, condensed and gas-phase functions. This work provided a facile strategy to fabricate a multifunctional CNF nanocomposite, making them hold great potential for application in aerospace and high-temperature thermal protection fields.</p><h3>Graphic Abstract</h3>\\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":511,\"journal\":{\"name\":\"Cellulose\",\"volume\":\"32 14\",\"pages\":\"8201 - 8220\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-08-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Cellulose\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10570-025-06735-0\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, PAPER & WOOD\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cellulose","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10570-025-06735-0","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, PAPER & WOOD","Score":null,"Total":0}
Silicotungstic acid-intercalated ZnAl-LDHs nanosheets-supported CNF aerogels for enhanced thermal insulation and flame retardant
Lightweight, heat-insulating, and high-temperature-resistant materials are essential for the safety of spacecraft and precision equipment. Nanocellulose (CNF), with their high specific surface area, low thermal expansion coefficient, and high strength, hold promising prospects for lightweight and thermally insulating aerospace materials. However, the inherent flammability and high brittleness of CNF severely limit their widespread use in high-temperature fields. To address these issues, this study successfully synthesizes [SiW12O40]4−-intercalated ZnAl-SiW12O40-LDHs (SiW-LDHs) and incorporates them into CNF with boric acid (BA) to prepare SiW-LDHs + BA/CNF aerogels. Results show that LDHs can be uniformly distributed within the porous network of CNF aerogels, and the CNF-based aerogel had a unique combination of lightweight construction, an exceptionally low density of the 50.0SiW-LDHs + BA/CNF aerogel is 0.0154 g/cm3, when the mass fractions of SiW-LDHs and BA were 50.0% and 2.0% of CNF, respectively. This aerogel exhibits excellent thermal insulation and flame-retardant performance with a low thermal conductivity of 0.038 W/(m·K), and the t250°C (time required for the central temperature on the backside of the aerogel to reach 250 °C from room temperature) was 2237.6 s, 1082.6 s longer than that of pristine CNF aerogel. Specifically, the 50.0SiW-LDHs + BA/CNF aerogel did not ignite during the 70 s of exposure to flame. The compressive strength and specific modulus after the impact the 50.0SiW-LDHs + BA/CNF aerogel were increased by a maximum of 255.0% and 118.0% compared to pristine CNF. From the analysis of the combustion residues, multiple fire-retardant mechanisms are generated during the combustion of SiW-LDHs + BA/CNF aerogel, which can be included as catalytic charring, condensed and gas-phase functions. This work provided a facile strategy to fabricate a multifunctional CNF nanocomposite, making them hold great potential for application in aerospace and high-temperature thermal protection fields.
期刊介绍：
Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.
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