Scattering cell

The solutions must be carefully prepared so as to be free of dust particles and other extraneous scatterers. Filtration through sintered glass or centrifugation is widely used to clarify solutions of particles which would compete with polymeric solutes. This concern for cleanliness also extends to glassware, especially scattering cells. A fingerprint on the viewing window is disastrous ... 

Raman scattering cell Raman spectrometry Raman spectroscopy... 

The mature vitreous contains a class of mononuclear phagocytic cells called hyalocytes (Balzas and Delinger, 1984). These cells are generally embedded in the vitreous humour 20-50 /tM away from the basal lamina, forming a single layer of scattered cells. In the developing eye they are located more centrally and are capable of synthesizing the main solid constituents of the vitreous gel. 

A scattering cell consists of a glass cylinder with flat entrance and exit windows. The scattering cell is centred on the axis of rotation of the receiver phototube. 

Fig. 1.5.2 Schematic diagrams of aerosol-vapor mixing manifolds. A The aerosol passes through the center tube while the reactant vapor (e.g., water vapor) is introduced through the capillaries (6). B (1) Inner tube for the liquid aerosol tlow, (2) outer tube for the humidified gas (e.g. helium), (3) cross section of the chamber, (4) variable reaction distance (X). (5) light beam. (6) illuminated light scattering volume, (7) light scattering cell. (From Ref. 37.)...

Using this arrangement, absolute clean scattering cells are not required because extraneous particles are removed by continued back pumping. 

When the scattering cell has been purified with accuracy, the arrangement can be simplified by directly connecting a gas-tight syringe with a filtration holder to the scattering cell (Fig. 10). 

Introducing the Rayleigh ratio of the scattering intensity to the primary beam intensity R(q) s i (q) r2/I, where r is the distance of the detector from the centre of the scattering cell, Eq. (B.8) may also be written as... 

As noted in the introduction, the first successful studies of PCS near the glass transition in polymers employed thermally polymerized styrene. The monomer was dried over calcium hydride and vacuum distilled directly into the scattering cell. This procedure was also successfully employed to prepare poly(methyl methacrylate)(PMMA)28) and poly-(ethyl methacrylate)(PEMA)29). Although our own samples were all prepared without... 

Fig. 19 Detector block for the light-scattering detector. (1) nebulizer, (2) drift tube, (3) heated copper block, (4) light-scattering cell, (5) glass rod, (6) glass window, (7) diaphragm. (Reproduced from A. Stoly-hwo, H. Colin, and G. Guiochon, J. Chromatogr. 265 1 (1983) with permission.)...

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