Latexes light source

In his experiment., Dahneke studied the bouncing of polystyrene latex spheres about 1 aem in diameter from polished quartz and other surfaces. Using a laser light source, he measured the velocities of the incident and reflected particles. The velocity of the incident particles was controlled by means of a deceleration chamber. 

Figure 5.S Variation of ligjji scattering over the angle from 35 to 120 from the forward direction for a He-Ne laser light source (A = 0.633 m). Particles were latex On = 1.588) and nigrosin dye Oti = 1.67 — 0.26/). The lower branch shows the approach to the Rayleigh seattering range (response tmd the upper branch shows the approach to geometric optics (response (Garvey and Pin nick. 1983).

In what follows, the word particle will be used to describe the source of the scattering. The word will encompass rigid structures such as latex spheres as well as macromolecules such as linear polymer chains. The particle will be viewed as a collection of smaller components each of which scatters light so that the total scattering from a particle will be written as a sum of scattered waves from the components. Such an approach permits the convenient calculation of angular dependence of scattering as well as the description of internal dynamics of linear polymer chains. 

On transverse section of the pedicel, two kinds of laticifers, a convex arc and a concave one, were observed in the peripheral bundle and in the central one, respectively. The placenta traces (placentae) and the valve traces (valves) through the capsule wall appeared light microscopically as dense masses of branching vascular tissues in chlorenchyma within the epicarp. The former were fewer in number and smaller in diameter than the latter. The placenta traces contained laticifers but no fibers. The valve traces became the main source of latex. No laticifers were detected in the ovule however, the terminals of the laticifers were observed near the junction of the placenta and ovule. Laticifers appeared in the phloem of the sepals and petals during blooming. Laticifers were detected in the stamen traces in the thalamus but not in the stamens. The ends of laticifers were detected in ovule traces. The diameters of laticifers in the ovary 2 weeks before petal fall were as large as those in the mature capsule. 

The illumination system contained a transparent plastic box, installed at the bottom of the wave tank and filled with an aqueous suspension of Latex particles with a diameter of about 0.3 p - 0.4 p. A nearly parallel light beam from a line-source lamp is directed into the box. Measurements with a photo receiver have shown that the resulting light intensity, in accor-... 

Cooper and co-workers 16> made a comparative study of the grafting of methyl methacrylate upon natural rubber latex using visible, ultraviolet and y-radiations as energy sources. It was found that the grafting took place with equal efficiency whether the radiation source was light or y-rays. 

---