Gouy balance

The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility of a sample.wikipedia
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Louis Georges Gouy

Gouy
The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility of a sample.
He is the namesake of the Gouy balance, the Gouy–Chapman electric double layer model (which is a relatively successful albeit limited model that describes the electrical double-layer which finds applications in vast areas of studies from physical chemistry to biophysics) and the Gouy phase.

Magnetic susceptibility

susceptibilitymagnetic susceptibilitiesvolume magnetic susceptibility
The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility of a sample. Gouy derived a mathematical expression showing that force is proportional to volume susceptibility for the interaction of material in a uniform magnetic field in 1889.
Early measurements are made using the Gouy balance where a sample is hung between the poles of an electromagnet.

Weighing scale

scalesscalebalance
In use, a long, cylindrical sample to be tested is suspended from a balance, partially entering between the poles of a magnet.

Evans balance

In the Gouy balance there is a homogeneous field in the central region between two (flat) poles of a permanent magnet, or an electromagnet.

Faraday balance

An alternative method for measuring magnetic susceptibility is the Gouy balance.

Magnetic field

magnetic fieldsmagneticmagnetic flux density
Gouy derived a mathematical expression showing that force is proportional to volume susceptibility for the interaction of material in a uniform magnetic field in 1889.

Magnet

permanent magnetmagnetspermanent magnets
In use, a long, cylindrical sample to be tested is suspended from a balance, partially entering between the poles of a magnet.

Paramagnetism

paramagneticparamagnetParamagnetic materials
A sample with a paramagnetic compound will be pulled down towards the magnetic, and provide a positive difference in apparent mass m b – m a.

Diamagnetism

diamagneticdiamagnetLandau diamagnetism
Diamagnetic compounds can either exhibit no apparent change in weight or a negative change as the sample is slightly repelled by the applied magnetic field.

Gravitational acceleration

acceleration due to gravityacceleration of gravityg

Thermostat

thermostatsdigital thermostatsheating control
The sample can also be enclosed in a thermostat in order to make measurements at different temperatures.

Electromagnet

electromagnetselectro-magnetelectromagnetic
The stationary magnetic of a Gouy balance is often an electromagnet connected to a power source, since balance recordings with and without the applied magnetic field are required of the procedure.

Non-Kekulé molecule

biradicalcannot be given a Kekulé structureoxyallyl
Eugene Müller, with the aid of a Gouy balance, established for the first time that these compounds are paramagnetic with a triplet ground state.

Cecilie French

She collaborated on research with Violet Trew at Bedford College until the arrival of the Gouy balance at QMC whereupon she began collaborating with D. Harrison there instead.

Measuring instrument

instrumentscientific instrumentinstruments
*Gouy balance