Abstract: A method is described for the preparation of electrophotographic toner particles which includes the use of SOLSPERSE.RTM.. The method involves dissolving in ethyl acetate a hyperdispersant selected from SOLSPERSE.RTM. 24000 and SOLSPERSE.RTM. 20000, thereby forming a solution; mixing the solution with a polymer material to form an organic phase; dispersing the organic phase in an aqueous phase containing a particulate stabilizer and homogenizing the resultant dispersion; evaporating the solvent; and washing and drying the resultant product.

Abstract: A three terminal semiconductor device relies on resonant tunnelling through a quantum well resonator for its operation. The device has a first layer of a narrow bandgap semiconductor, a second layer of a narrow bandgap semiconductor, and a quantum well resonator between the first layer of a narrow bandgap semiconductor and the second layer of a narrow bandgap semiconductor. The quantum well resonator comprises a first layer of a wide bandgap semiconductor, a second layer of a wide bandgap semiconductor, and a third layer of a narrow bandgap semiconductor between the first layer of a wide bandgap semiconductor and the second layer of a wide bandgap semiconductor. All of the layers referred to above have a common conductivity polarity.