通过将表面等离子体共振反射率与纳米流体的有效折射率相关联来测量近场纳米粒子浓度分布。

Measuring near-field nanoparticle concentration profiles by correlating surface plasmon resonance reflectance with effective refractive index of nanofluids.

机构信息

Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee,Knoxville, Tennessee 37996, USA.

出版信息

Opt Lett. 2010 Feb 1;35(3):393-5. doi: 10.1364/OL.35.000393.

DOI:10.1364/OL.35.000393

PMID:20125732

Abstract

Time-dependent and near-field nanoparticle concentrations are determined by correlating the surface plasmon resonance (SPR) reflectance intensities with the effective refractive index (ERI) of the nanofluid under evaporation. A critical angle measurement for total internal reflection identifies the ERI of the nanofluid at different nanoparticle concentrations. The corresponding SPR reflectance intensities correlate the nanofluidic ERI with the nanoparticle concentrations. Example applications for evaporating nanofluidic droplets containing 47 nmAl(2)O(3) particles demonstrate the feasibility of this new imaging tool for measuring time-resolved and full-field nanoparticle concentration profiles.

摘要

通过将表面等离子体共振 (SPR) 反射强度与蒸发过程中纳米流体的有效折射率 (ERI) 相关联，确定了随时间变化的近场纳米粒子浓度。全内反射的临界角测量确定了不同纳米粒子浓度下纳米流体的 ERI。相应的 SPR 反射强度将纳米流体 ERI 与纳米粒子浓度相关联。含有 47nmAl(2)O(3)粒子的蒸发纳米流体液滴的应用实例证明了这种新的成像工具用于测量时间分辨和全场纳米粒子浓度分布的可行性。