Open AccessSurveying colloid sedimentation by coplanar waveguides
Author(s) -
Duţu Ca,
Alexandru Vlad,
C Roda-Neve,
Ionel Avram,
Georgiana Sandu,
Raskin Jp,
Sorin Melinte
Publication year - 2016
Publication title -
nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.926
H-Index - 203
eISSN - 1361-6528
pISSN - 0957-4484
DOI - 10.1088/0957-4484/27/22/225502
Subject(s) - sedimentation , materials science , colloid , optics , chemical engineering , engineering , geomorphology , physics , geology , sediment
By using coplanar waveguides, a direct access to the dielectric properties of aqueous solutions of polystyrene beads with different diameters from 330 nm to 10 microns is provided. The relative variation of the transmission parameter with respect to water is monitored, ranging from ~3% obtained for a 9.5% solution with 330 nm diameter beads to ~22% for 10 microns diameter particles at the same concentration. To highlight its applicability in biosensing, the technique was further employed to survey the clustering between biotin and streptavidin-coated beads. The transmission parameter displays a ~50% increase for mixtures containing 9 volumes of biotin and 1 volume of streptavidin-modified beads (4.5 ng/microliter of streptavidin) and reaches ~400% higher values when equal volumes of biotin and streptavidin-coated beads (22.5 ng/microliter of streptavidin) were mixed