公开(公告)号：US20150321921A1

公开(公告)日：2015-11-12

申请号：US14747996

申请日：2015-06-23

Applicant: Massachusetts Institute of Technology

Inventor： Taofang Zeng ,  Yanijia Zuo ,  Gang Chen

IPC: C01B33/14

CPC classification number: C01B33/14 ,  C01B33/1585 ,  C01P2006/16 ,  C04B14/064

Abstract: Silica aerogels with improved properties are disclosed together with methods for synthesizing such aerogels. The improved properties include lower thermal conductivity (better insulating capacity), lower acoustic velocity, lower dielectric constant and improved ductility. Greater tunability of the refractive index can also be achieved. The silica aerogels are prepared by a sol-gel processing method that provides better control of the formation or aerogel structures. Generally speaking, the improvements arise from control of the synthesis to create a morphology of primary clusters and diverse-sized secondary clusters of dense silica aerogels separated by less densely packed regions. By providing a broader range of secondary clusters and/or pore sizes and loose connectivity between clusters, reductions can be achieved in thermal conductivity and flexural modulus.

Abstract translation: 公开了具有改进性能的二氧化硅气凝胶以及合成这种气凝胶的方法。 改进的性能包括较低的热导率（更好的绝缘能力），更低的声速，更低的介电常数和更好的延展性。 也可以实现更高的折射率的可调性。 二氧化硅气凝胶通过溶胶 - 凝胶加工方法制备，其提供对形成或气凝胶结构的更好控制。 一般来说，改进是由合成的控制产生的，以形成一个初级团簇的形态和由密度较小的区域分开的致密二氧化硅气凝胶的不同大小的二级团簇。 通过提供更广泛的次级簇和/或孔径和簇之间的松散连通性，可以在热导率和挠曲模量方面实现降低。