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- Q6934570 subject Q6425689.
- Q6934570 subject Q7162170.
- Q6934570 subject Q8388804.
- Q6934570 subject Q8706947.
- Q6934570 abstract "Multiangle light scattering (MALS) is a technique for determining, independently, the absolute molar mass and the average size of particles in solution, by detecting how they scatter light. Collimated light from a laser source is most often used, in which case the technique can be referred to as multiangle laser light scattering (MALLS). The insertion of the word “laser” was intended to reassure those used to making light scattering measurements with conventional light sources such as Hg-arc lamps that low angle measurements could now be made. Until the advent of lasers and their associated fine beams of narrow width, the width of conventional light beams used to make such measurements prevented data collection at smaller scattering angles. In recent years, since all commercial light scattering instrumentation use laser sources, this need to mention the light source has been dropped and the term MALS used throughout.The "multi-angle" term refers to the detection of scattered light at different discrete angles as measured, for example, by a single detector moved over a range that includes the particular angles selected or an array of detectors fixed at specific angular locations. A discussion of the physical phenomenon related to this static light scattering, including some applications, data analysis methods and graphical representations associated therewith are presented.A MALS measurement requires a set of ancillary elements. Most important among them is a collimated or focused light beam (usually from a laser source producing a collimated beam of monochromatic light) that illuminates a region of the sample. In modern instruments, the beam is generally plane-polarized perpendicular to the plane of measurement, though other polarizations may be used especially when studying anisotropic particles. Earlier measurements, before the introduction of lasers, were performed using focused, though unpolarized, light beams from sources such as Hg-arc lamps. Another required element is an optical cell to hold the sample being measured. Alternatively, cells incorporating means to permit measurement of flowing samples may be employed. If single-particles scattering properties are to be measured, a means to introduce such particles one-at-a-time through the light beam at a point generally equidistant from the surrounding detectors must be provided.Although most MALS-based measurements are performed in a plane containing a set of detectors usually equidistantly placed from a centrally located sample through which the illuminating beam passes, three-dimensional versions also have been developed wherein the detectors lie on the surface of a sphere with the sample controlled to pass through its center where it intersects the path of the incident light beam passing along a diameter of the sphere. The former framework is used for measuring aerosol particles while the latter was used to examine marine organisms such as phytoplankton.".
- Q6934570 wikiPageWikiLink Q1004846.
- Q6934570 wikiPageWikiLink Q1189804.
- Q6934570 wikiPageWikiLink Q1617865.
- Q6934570 wikiPageWikiLink Q17128025.
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- Q6934570 wikiPageWikiLink Q178036.
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- Q6934570 wikiPageWikiLink Q193709.
- Q6934570 wikiPageWikiLink Q38867.
- Q6934570 wikiPageWikiLink Q4669819.
- Q6934570 wikiPageWikiLink Q4974631.
- Q6934570 wikiPageWikiLink Q6425689.
- Q6934570 wikiPageWikiLink Q645497.
- Q6934570 wikiPageWikiLink Q7162170.
- Q6934570 wikiPageWikiLink Q7604173.
- Q6934570 wikiPageWikiLink Q8388804.
- Q6934570 wikiPageWikiLink Q8706947.
- Q6934570 wikiPageWikiLink Q896108.
- Q6934570 wikiPageWikiLink Q900625.
- Q6934570 wikiPageWikiLink Q901737.
- Q6934570 comment "Multiangle light scattering (MALS) is a technique for determining, independently, the absolute molar mass and the average size of particles in solution, by detecting how they scatter light. Collimated light from a laser source is most often used, in which case the technique can be referred to as multiangle laser light scattering (MALLS).".
- Q6934570 label "Multiangle light scattering".