Water static light scattering

At the end of six hours, the ethane/propane is vented and a 3 1 chloroform/methanol solution is injected to the system, dissolving the surfactant, water, and unreacted monomer. The polymer, which is insoluble in the chloroform/methanol mixture, is collected by filtration, washed with additional chloroform/ methanol and acetone, dried under vacuum, and weighed. The average molecular weight of the polymer (M ) is measured using static light scattering (see for example (12)] of dilute solutions of the polymer in water. 

Figure 5 Particle size for a 10% com oil-in-water emulsion measured by ultrasonic attenuation spectroscopy (Malvern Ultrasizer, Malvern, UK) and a static light-scattering measurement (LA-900, Horiba Instmments, Irvine, CA) of a dilution (O < 0.05%) of the same emulsion. Both techniques give comparable results, but ultrasound is reliable in more realistic, concentrated emulsions.

Brown, W., Schillen, K. and Almgren, M., 1991. Micelle and gel formation in a poly(ethylene oxide)/poly(propylene oxide)/poly(ethylene oxide) triblock copolymer in water solution. Dynamic and static light scattering and oscillatory shear measurements. Journal of Physical Chemistry, 95, 1850-1858. 

Figure 3.IS Results from dynamic lightscattering measurements on (a) the Ci2Es-water-decane system, and (b) the Ci2E5-water-hexadecane system. Results from the static light-scattering measurements on...

A detailed synthesis and characterization of PVPA has been presented by Bingol et al VPA was polymerized in distilled water in the presence of 2.5% w/w azobisisobutyramidine dihydrochloride (AIBA), under an argon atmosphere. The reaction mixture was heated to 80 °C for 3 h. The product was then dissolved in water and dialyzed in order to separate the polymer from oligomer and unreacted monomer, and the resulting polymer was freeze dried. The yield of polymer was approximately 70% and the molecular weight was found to be in the order of 60 000 g mol, as characterized by static light scattering. 

Figure 18.4. Static light scattering from water-in-oil microemulsion droplets with the surfactant sodium bis(2-ethylhexyl) sulfosuccinate (AOT). The normalized static scattering intensity < > is shown as a function of the...

The formation of CTAB rod-like micelles with molecular weight of 10 in the presence of KBr was reported by Debye and Anacker [42], About a decade ago, the salt-induced sphere-rod transition of alkyltrimethy-lammonium halides was extensively studied with the use of static light scattering and viscometry [43-46]. The formation of surfactant micelles in low-molecular electrolyte solution has been described as a two-step process at first, primary spherical micelles were formed and then, with further increase of salt concentration, micelles reorganized to the secondary rod-like shape [47]. It was also concluded that the salt-induced sphere-rod transition of the surfactant micelles is not caused by the change in water structure [48]. 

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