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DLSÊÇ»ùÓÚ²¼ÀÊÔ˶¯£¨Brownian motion£©£¬Í¨¹ý²â¶¨¿ÅÁ£µÄÀ©É¢ÏµÊý£¨diffusion coefficient£¬D£©¶ø¸ù¾ÝStokes-Einstein¹«Ê½¼ÆËã¿ÅÁ£µÄ´óС¡£
Malvern zetasizerµÄÊֲὲ£º¡°It does this by illuminating the particles with a laser and analysing the intensity fluctuations in the scattered light.¡±
µ«ÊÇ£¬ÁíÒ»±¾ÊéÀïÃèÊöµÄDLSÔ­Àí¸úMalvern zetasizerÊÖ²áÉÏ˵µÄ²»Ò»Ö£º¡°The precisely defined frequencies associated with laser sources make it possible to exploit light scattering to study the motion of colloidal particles. Light scattered by a moving particle will experience a Doppler shift to slightly higher or lower frequency depending on whether the particle is moving towards or away from the observer. For a collection of particles moving at random by virtue of their Brownian motion, a Doppler frequency broadening will result. Mixing this broadened, scattered signal with incident light produces a pattern of beat frequencies, the measurement of which allows the diffusion coefficient of the particles to be calculated.
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The width of the Doppler broadened peak at half-height is related to the diffusion coefficient¡­¡±
(Duncan J. Shaw (1992), Introduction to Colloid and Surface Chemistry, 4th Edition, page: 61-62)

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