Gouy balances

Gouy balance A balance for the determination of magnetic susceptibility. The sample is weighed in and out of a magnetic field and the susceptibility is calculated from the difference in weights. 

Compounds with unpaired electrons are paramagnetic. They tend to move into a magnetic field and can be identified because they seem to weigh more in a Gouy balance when a magnetic field is applied than when it is absent. Paramagnetism arises from the electron spins, which behave like tiny bar magnets that tend to line up with the applied field. The more... 

A Gouy balance is used to observe the magnetic character of a sample by detecting the extent to which it is drawn into (paramagnetic substances) or driven out of (diamagnetic substances) a magnetic field. 

The number of unpaired electrons in a paramagnetic complex can be determined with a Gouy balance. 

A simple apparatus used to measure magnetic susceptibilities (a Gouy balance) is shown in Figure 25-1 ... 

The sensitivity of the Gouy balance (typically 10-8 cgs-emu cm 3) is acceptable for paramagnetic substances diamagnetic samples give very small... 

A. Saunderson, A permanent magnet Gouy balance, Physics Educ. 3 272-273 (1969). 

Despite the heavy teaching load, French maintained an incredible research output. Until a Gouy balance was installed at QMC in 1951, French collaborated with Violet Trew at... 

The Gouy Balance. In the Gouy balance (Fig. 2), a long tube, divided into two regions by a septum, is suspended from one side of an analytical balance so as to hang vertically... 

In order to determine the apparatus constant iioffAll that appears in Eq. (13), measurements are made on a material of known susceptibihty. Eor this purpose, a common standard is an aqueous solution of nickel chloride, about 30 percent NiCl2 by weight. Prepare 100 mL of such a solution with an accurately known weight fraction of NiCl2 in air-free distilled water. When this and other solutions are weighed on the Gouy balance, record the ambient temperature. 

Gouy balance (comprising a magnet, power supply if needed, suitably modified analytical balance) glass-stoppered Gouy tube several 100-mL volumetric flasks and glass-stoppered 200-mL flasks thermometer Westphal balance or hydrometer (optional). 

When a substance is subjected to magnetic field H, and a magnetization I is induced. The ratio I/H is called the volume susceptibility k and can be measured by a number of techniques, including Gouy balance method, Faraday method and an nmr method. The volume susceptibility is related to the gram susceptibility c and the molar susceptibility cm. 

The popular experimental techniques involve Faraday or Gouy balance measurements where the quantity being measured is the force acting on a body when it is in the magnetic field... 

---