Brice-Phoenix light scattering

Figure 10.9 Light-scattering photometers, (a) Schematic top view showing movable photodetector. (Reprinted from Ref. 2, p. 176.) (b) Cutaway photograph of commercial light-scattering instrument, the Brice-Phoenix Universal Scattering Photometer. (Photo courtesy of the Virtis Co., Gardiner, New York.)...

Determination of the Refractive Index Increment. In order to be able to calculate results obtained from light-scattering measurements, the refractive index increment (dn/dc) of HEC must be known. For this reason, an absolute differential refractometer (Brice-Phoenix Instrument Company, Philadelphia 40, PA type 1120) was calibrated geometrically (18), using the next formula ... 

Light scattering measurements were carried out on a Brice-Phoenix photometer in three solvents—tetrahydrofuran, toluene, and methyl isobutyl ketone. The values of Hc/t and sin2 0/2 -f- 10c were calculated, where c is concentration, with the aid of a computer. 

The Brice-Phoenix light scattering photometer and the Absolute light scattering photometer were designed for the measurement of attenuation, dissymetry and depolarization. The former has also been used to determine the particle size distribution of an aerosol at various levels in a flowstream through a column [125]. 

A Brice Phoenix Model 2000 spectrophotometer was used to measure the intensity of light scattered at 90° and transmitted at 180° through the stationary-phase culture of E. coli Strain CR63. From the scattering intensity ratio ho lhso y the turbidity may be calculated via Equation 10, which uses the ratio of galvanometer deflections recorded experimentally (23) ... 

Molecular weights were obtained employing light scattering photometry utilizing a Brice-Phoenix OM-3000 Universal Light Scattering Photometer. 

Light scattering was carried out employing a Brice-Phoenix BP 3000 Universal Light Scattering Photometer. Refiactive indices were obtained using a Bauch Lomb Abbe Model 3-L refractometer. 

The intensity of scattered light was measured by Brice-Phoenix OM-2000 photometer at 436 nm as a function of scattering angle (45° -135°). The solutions were filtrated by Millipore membrane filter. A stock solution of 0.4% PVP made in NaDS solution was diluted at constant chemical potential of the solvent. The composition of the solvent for dilution was determined from potentiometric and equilibrium dialysis measurements as well. Refractive index increments were determined by Brice-Phoenix differential refractometer. 

Molecular weight determinations were obtained using a Brice-Phoenix Model BP-3000 Universal Light Scattering Photometer. Refractive Index Increments, dn/dc, were determined using a Bausch and Lomb Abbe Refractometer Model //3-L. 

Light-scattering Photometer OM-2000 Brice-Phoenix Absolute values via Zimm plots... 

The intensity of light scattered at 45° and 135° was measured in a Brice-Phoenix light scattering photometer, and the dissymmetry was calculated from the ratio of these intensities. The latex sample was diluted to such a concentration that the dissymmetry was independent of polymer concentration. The dissymmetries were measured at four different wavelengths of light, and the average particle size was estimated using tables calculated for this purpose (8). 

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