Laser Light-Scattering Experiment

Another set of experiments that exploited the coherence of laser emission used interferometry or reffactometry to study a range of phenomena. These included polymerization kinetics (39), diffusion (40), surface tension (41), and viscosity (42). These experiments, along with the laser light scattering experiments, can be found in Table III. 

Fig. 4. Influence of chloride ions on the depolymerisation of hyaluronic acid induced by Cu(II) and hydrogen peroxide, as measured by low-angle laser-light scattering experiments. Open and closed squares 0.5 and 0.05 mol dm-3 Cl-, respectively. Triangles and circles are for experiments using 0-0.5 mol dm-3 ionic strength solutions using either Na2S04 or NaC104 instead of NaCl.

Although in the absence of hyaluronic acid, dilute solutions of hydrogen peroxide remain relatively stable in the presence of cupric and chloride ions, when hyaluronic acid is also present, the hydrogen peroxide decomposes accompanied by the degradation of hyaluronic acid [91]. Fig. 4 shows the depolymerisation data as measured by low-angle laser-light scattering experiments. 

The value in parentheses is the average-weight molecular weight found in static laser light scattering experiments for DMSO solution of the copolymer. 

Estimation of the average molecular weights for [PcMO] (M=Si, Ge, Sn) by IR end-group analysis, tritium labeling and laser light scattering experiments... 

Figure 1 illustrates the geometry of a typical laser light scattering experiment within a laboratory-fixed frame of reference x,y,z. 

The observations and questions raised by these workers helped stimulate the experiments which are presented here. In this work, size exclusion chromatography with low angle laser light scattering detection (SEC/LALLS) was used to probe the distribution of branching functionality in multiarm macromolecules of styrene/isoprene and styrene/buta-... 

The light source used in the light scattering experiment was He-Ne laser, attenuated to produce a power of lOmW, and the wavelength was 0.6328 pm. The thickness of the specimen for the light scattering experiment was 20 pm. 

Several simple relations have been proposed for the determination of the fractal dimensions from the results of such experiments as gas molecular probe method, transmission electron microscopy (TEM), small-angle X-ray scattering, neutron scattering, and laser light scattering.63,66,113 116 Among those techniques, gas molecular probe method and image analysis method have been widely used for the calculation of the surface... 

In further experiments in oxygenated solutions using pulse radiolysis techniques with low-angle laser-light scattering detection, the yields of strand breakage were measured at pH values of 7, 9.7 and 10.4. Table 2 summarises these data. 

Experiments—previously impossible without laser light scattering technology— suggested by this work involve studying the effect on physical properties of varying particle size for different types of elastomers. 

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