Formation of Light-weight Low-density Materials via Gas Phase Aerosol Gelation

Sorensen, C. M.; Dhaubhadel, Rajan; Gerving, Corey S.

doi:10.1557/opl.2011.93

Cited by 1 publication

(1 citation statement)

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“…Sorensen et al continued this work in material synthesis systems and were the first to systematically study the phenomenon of gelation in an aerosol by demonstrating spontaneous gelation from soot particles in a laminar diffusion flame without externally applied fields. Sorensen et al refined the concept of aerosol gels and gave a physical explanation of gas‐phase aerogelation by examining the production of an “ultralow density porous carbon material” formed in a tubular reactor from spherical primary particles undergoing aggregation . Simulation of aerogelation in 1D systems has focused on fluid dynamics and reaction rates within such systems, but have lacked collision rates between nanotubes to determine the onset of aerogelation .…”

Section: Introductionmentioning

confidence: 99%

Agglomeration Dynamics of 1D Materials: Gas‐Phase Collision Rates of Nanotubes and Nanorods

Boies

Hoecker

Bhalerao

et al. 2019

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The agglomeration and self‐assembly of gas‐phase 1D materials in anthropogenic and natural systems dictate their resulting nanoscale morphology, multiscale hierarchy, and ultimate macroscale properties. Brownian motion induces collisions, upon which 1D materials often restructure to form bundles and can lead to aerogels. Herein, the first results of collision rates for 1D nanomaterials undergoing thermal transport are presented. The Langevin dynamic simulations of nanotube rotation and translation demonstrate that the collision kernels for rigid nanotubes or nanorods are ≈10 times greater than spherical systems. Resulting reduced order equations allow straightforward calculation of the physical parameters to determine the collision kernel for straight and curved 1D materials from 102 to 106 nm length. The collision kernels of curved 1D structures increase ≈1.3 times for long (>102 nm), and ≈5 times for short (≈102 nm) relative to rigid materials. Applications of collision frequencies allow the first kinetic analysis of aerogel self‐assembly from gas‐phase carbon nanotubes (CNTs). The timescales for CNT collision and bundle formation (0.3–42 s) agree with empirical residence times in CNT reactors (3–15 s). These results provide insights into the CNT length, number, and timescales required for aerogel formation, which bolsters our understanding of mass‐produced 1D aerogel materials.

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Section: Introductionmentioning

confidence: 99%