Wang Fei, Liang Jinsheng, Tang Qingguo, Chen Cong, Chen Yalei
J Nanosci Nanotechnol. 2014 May;14(5):3937-42. doi: 10.1166/jnn.2014.7982.
The longitudinal and cross sectional TEM images of sepiolite mineral nanofibers were prepared by cutting in the direction parallel and perpendicular to nanofibers, and the channel microstructure of sepiolite nanofibers was studied. The thermal insulation mechanism of sepiolite nanofibers was analyzed according to the diagrammatic sketch obtained from the above experimental method. The results showed that many discontinuously connected bending shape channels with about 23-26 nm in diameter existed in the center region of nanofibers, and many discontinuously connected irregular micropores and mesopores with the size of about 1-9 nm existed on the wall of nanofibers. The main reasons for the formation of channel microstructure in sepiolite nanofibers were their minerogenetic conditions and the interaction between acid and high-speed airflow in the process of nanofibers preparation, and bubbles in the hydrotherm played a significant role in the microstructure formation. The thermal insulation performance of sepiolite nanofibers could be attributed to obstructive and infrared radiative thermal insulation.
通过沿平行和垂直于海泡石矿物纳米纤维的方向切割，制备了海泡石矿物纳米纤维的纵向和横截面透射电镜图像，并研究了海泡石纳米纤维的通道微观结构。根据上述实验方法获得的示意图，分析了海泡石纳米纤维的隔热机理。结果表明，在纳米纤维的中心区域存在许多直径约为23 - 26 nm的不连续连接的弯曲形通道，在纳米纤维壁上存在许多尺寸约为1 - 9 nm的不连续连接的不规则微孔和介孔。海泡石纳米纤维中通道微观结构形成的主要原因是其成矿条件以及纳米纤维制备过程中酸与高速气流之间的相互作用，水热过程中的气泡在微观结构形成中起了重要作用。海泡石纳米纤维的隔热性能可归因于阻碍性隔热和红外辐射隔热。
