1 中南大学资源与安全工程学院，长沙 410083
2 中国科学技术大学，火灾科学国家重点实验室，合肥 230027
提高疏水SiO2气凝胶的热稳定性对拓展其保温隔热应用具有重大意义。为了避免空气氛围下热处理对疏水基团造成的热氧化分解，采用氩气氛围对疏水SiO2气凝胶进行热处理，达到调控其热稳定性的目的。结果表明：经氩气氛围700 ℃热处理后，SiO2气凝胶仍维持着良好疏水性，接触角约140°。在空气氛围下的差式扫描量热测试中，热流峰值达到584 ℃，与未热处理的疏水SiO2气凝胶相比提高约300 ℃，热稳定性显著提高。这为提高疏水SiO2气凝胶的热稳定性和安全性提供了新思路，奠定了疏水SiO2气凝胶高温应用的新基础。
二氧化硅 气凝胶 热处理 热稳定性 氩气氛围 silica aerogel heat treatment thermal stability argon atmosphere
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy (East China Normal University), Department of Physics, and Department of Biology, East China Normal University, Shanghai 200062
Raman spectroscopy has strong potential for providing non-invasion diagnosis of cancers. In this paper, micro-Raman spectroscopy is used to diagnose one most common liver cancer, hepatocellular carcinoma (HCC). The statistical analyzes, including t-test, principal component analysis (PCA), and linear discriminant analysis (LDA), are performed on the Raman spectra of malignant and normal hepatocytes. The t-test-LDA results show that the 786- and 1004-cm^{-1} bands of the malignant and normal hepatocytes are significantly different, and PCA-LDA results show an overall accuracy of 100% for the Raman spectroscopic identification of normal and malignant hepatocytes in our experiment.
拉曼光谱 肝细胞癌 t-检验 主成分分析 线性判别分析 300.6450 Spectroscopy, Raman 170.5660 Raman spectroscopy 170.1530 Cell analysis Chinese Optics Letters
2009, 7(1): 0160
1 Kunming Institute of Technology, Kunming 650093
2 Yunnan Academy of Agricultural Science, Kunming
Chinese Journal of Lasers B
1993, 2(2): 189
