Zeta-APS如何测量Zeta电位和粒度分布？_20200917104158.pdf

Zeta-APS如何测量Zeta 电位和粒径分布？ How doestheZeta-APSmeasureparticlesizedistributions? Zeta-APS如何测量粒度分布？ TheZeta-APSaccurately measuresacoustic attenuation (dB/cm)vs.frequency of sound (1 to 100 MHz) of colloidal dispersions. These measurements are commonly referred to as Acoustic Attenuation Spectroscopy. The Zeta-APS also simultaneously measures speed of sound vs. frequency, percent solids, pH, conductivity, and temperature. The attenuation level, as well as, the shape of the acoustic attenuation curve shape is related to the particle size distribution (PSD). PSD’s are calculated from the acoustic attenuation data using software developed and patented by Lucent Technologies.This Lucent Technologies software isbased on the Epstein and Carhart (laterrefinedbyAllegraandHawley) theory ofacousticattenuation. Zeta-APS精确测量了胶体分散体的声衰减 （dB/cm）与频率 （1-100MHz） 的关系。这些测量通常被称为声衰减谱。Zeta-APS可以同时测量声速、频率、 固体百分比、pH 值、电导率和温度。衰减水平以及声衰减曲线形状与颗粒粒径 分布 （PSD）有关。PSD 是由Lucent Technologies开发并获得专利的软件。该软 件基于Epstein 和Carhart （后来由Allegra 和Hawley 改进）的声衰减理论。 How doestheZeta-APSmeasureZetaPotential (ZP)? Zeta-APS如何测量Zeta 电位？ The Zeta-APS uses an electroacoustic technique called Electrokinetic Sonic Amplitude (ESA, invented by Matec Applied Sciences) to measure Zeta potential of particles suspended in liquids.TheZeta-APS’Zeta sensor applies short highfrequency (AC) pulses to the sample located within the electrode region of the Zeta sensor. These pulses last about 30 micro-seconds in the frequency range 0.5-3.5 MHz. The particles“jiggle”back and forth duetotheir surface electricchargewhichproducesan output soundwave ofthe same frequency astheapplied soundwave-providedthere is a particle/solvent density difference of at least 2%. The sample can be mixed and/or pumpedduringthemeasurementwithout interferingwiththeESAmeasurement. Zeta-APS测量Zeta 电位的方法被称为电声振幅（ESA）。Zeta-APS 的Zeta 电位探头将高频交流脉冲施加到位于传感器电极区域内的样品中，这些脉冲在 0.5-3.5MHz 的频率范围内持续约30微秒。由于粒子的表面电荷会产生与所施