Measurement of Viscosity of Fe3O4 Silicon Oil Based Ferrofluid by Rotating Viscometer Method (CAT#: STEM-PPA-0033-YJL)

Introduction

Magnetic fluids, also called ferrofuids (FFs), are stable colloidal suspensions that consist of magnetic nanoparticles dispersed in base liquid such as water or oil. As new functional materials, FFs exhibit both liquid behavior and magnetic properties, so they have been widely investigated. Magnetoviscous effect is one of the most important properties of FFs.
Owing to its excellent thermostability and low volatility, silicon oil is often chosen as carrier liquid of FFs. The shear shinning behavior and viscosity–temperature properties of silicon oil based FFs have been reported in the previous study. However, there are few reports on the magnetoviscous effect of these FFs.

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Principle Applications Procedure Materials Notes Related Products

Principle

The principle of the rotating viscometer method to measure the force acting on a rotor (torque) when it rotates at a constant angular velocity (rotational speed) in a liquid. Rotating viscometers are used for measuring the viscosity of Newtonian (shear-independent viscosity) or non-Newtonian liquids (shear dependent viscosity or apparent viscosity). Rotating viscometers can be divided in 2 groups, namely absolute and relative viscometers. In absolute viscometers the flow in the measuring geometry is well defined.
The measurements result in absolute viscosity values, which can be compared with any other absolute values. In relative viscometers the flow in the measuring geometry is not defined. The measurements result in relative viscosity values, which cannot be compared with absolute values or other relative values if not determined by the same relative viscometer method. Different measuring systems are available for given viscosity ranges as well as several rotational speeds.

Applications

Mineral oil industry; Food industry; Cosmetic/pharmaceutical industry; Petroleum industry; Chemical industry

Procedure

1. Pour the liquid into the measuring cup.
2. Insert the spindle into the liquid.
3. Rotate the spindle and measure the resistance.

Materials

• Sample Type: liquid, gel-like, or semi-solid everyday substances

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