Colloid composed of finely ground iron oxide in a fluid such as heptane, is controlled and directed magnetically in a zero gravity environment. It will not separate on standing for long periods or after exposure to magnetic or centrifugal forces. Because of its low density and low viscosity, it is easily pumped

Papell, S. S.

English

NASA Technical Reports Server

November 1965
	 Brief 65-10335 
NASA TECH BRIEF ia 
NASA Tech Briefs are issued by the Technology Utilization Division to summarize specific 
technical innovations derived from the space program. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia, 22151. 
Magnetic Fluid Readily Controlled in Zero Gravity Environment 
The Problem: To produce a fluid that can be 
readily controlled in the absence of gravity or under 
reduced gravitational conditions. 
The solution: A colloidal suspension of finely 
ground iron oxide in a fluid such as heptane, jet 
fuel (JP-4), or hydrazine. When used in controlled 
magnetic fields, the mixture can be pumped in the 
absence of gravity or can be used to simulate a wide 
range of gravity levels. 
How it's done: A mixture composed of a fluid 
such as heptane, powdered magnetic iron oxide 
(Fe304), and a grinding agent such as 5% oleic acid 
is rotated at 48 rpm in a 1-quart stainless-steel-ball 
mill until the iron oxide is colloidally suspended and 
represents about 3% to 8% by weight of the mixture. 
The resultant low-viscosity magnetic colloid is 
decanted, leaving the larger particles of iron oxide 
that will not go into suspension to remain in the mill 
for future grinding. Iron oxide particles of less than 
0.25 micron in diameter result in the formation of a 
true colloid.
Notes: 
I. This colloid is readily controlled and directed 
magnetically. It will not separate on standing 
for long periods or after exposure to magnetic 
or centrifugal forces. Because of its low density 
and low viscosity, it is easily pumped. 
2. This colloidal suspension should have application 
in the design of magnetic clutches and drives. 
It would be useful in conjunction with flow-
measuring equipment, and as a trace medium in 
nondestructive testing. 
3. Inquiries concerning this invention may be directed 
to:
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio, 44135 
Reference: B65-10335 
Patent status: NASA encourages the immediate 
commercial use of this invention. Inquiries about 
obtaining rights for its commercial use may be made 
to NASA, Code AGP, Washington, D.C., 20546. 
Source: Stephen S. Papell 
(Lewis- 126) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Magnetic fluid readily controlled in zero gravity environment

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