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On total internal reflection investigation of nanoparticles by integrated micro-fluidic system

机译:集成微流控系统研究纳米粒子的全内反射

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We report on a novel sensor for characterization of nanoparticles colloidal suspensions. We employ a diffraction grating under total internal reflection for investigation of nanodisperse fluids passing through an integrated microfluidic channel. Dispersions containing polymeric, metallic, and ferromagnetic nanoparticles are studied. Using this device, we can accurately determine in real-time the specific refractive index for the nanoparticle suspension and the nanoparticle concentration. The nanoparticle concentrations can be calculated with a resolution of 0.3-0.5 wt % for polymeric nanoparticles, 0.03-0.05 wt % for metallic nanoparticles, and 0.05-0.1 wt % for ferromagnetic nanoparticles. This translates to an effective refractive index that can be determined with an accuracy of 7 x 10(-4) for the polymeric and 2 x 10(-4) for the metallic and ferromagnetic dispersions.
机译:我们报告了一种新型传感器,用于表征纳米粒子胶体悬浮液。我们采用在全内反射下的衍射光栅来研究通过集成微流体通道的纳米分散液。研究了包含聚合物,金属和铁磁纳米粒子的分散体。使用该设备,我们可以实时准确地确定纳米颗粒悬浮液的比折射率和纳米颗粒浓度。可以以对于聚合物纳米颗粒为0.3-0.5wt%,对于金属纳米颗粒为0.03-0.05wt%以及对于铁磁纳米颗粒为0.05-0.1wt%的分辨率来计算纳米颗粒浓度。这转化为有效折射率,对于聚合物,可以确定为7 x 10(-4),对于金属和铁磁分散体,可以确定为2 x 10(-4)。

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