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US 7,719,265 B2Granted
Methods for determining particle size of metal nanocatalyst for growing carbon nanotubes
AssigneesHonda Motor Co., Ltd., The Ohio State University Research Foundation
InventorsAvetik Harutyunyan, Elena Mora Fernandez, Toshio Tokune
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Abstract
Methods and processes for determining the particle size distribution of metal catalysts are provides. Superconducting Quantum Interference Device (SQUID) magnetometer is used to evaluate the magnetic catalyst particle sizes dispersed in the support material. Dependence on variation of the metal/support material ratio, which defines the metal particle sizes, the catalyst can show paramagnetic, superparamagnetic, and ferromagnetic behaviors.
Claims12
A method for determining the average particle size of a metal catalyst, the method comprising:
- obtaining a magnetization curve of the metal catalyst using SQUID magnetometer, wherein the catalyst is on a powdered oxide support, wherein the powdered oxide is selected from the group consisting of Al2O3, SiO3, MgO and zeolites;
- and
- determining the average particle size from the magnetization curve.
Dependencies are inferred from the claim text.