Surveying colloid sedimentation by coplanar waveguides. (26th April 2016)

• Record Type: Journal Article
• Authors: Duţu, C A; Vlad, A; Roda-Neve, C; Avram, I; Sandu, G; Raskin, J-P; Melinte, S
• Is Part Of: Nanotechnology. Volume 27:Number 22(2016)
• Publication Date: 2016-04-26
• Subjects: coplanar waveguides -- colloids -- sensors -- biomedical applications of nanotechnology -- radio-frequency and microwave measurements; 82.70.Dd -- 84.40.Az -- 07.07.Df -- 87.83.+a -- 52.70.Gw; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/27/22/225502
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: By using coplanar waveguides, direct access to the dielectric properties of aqueous solutions of polystyrene beads with different diameters from 330 nm to 10 μ m 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 μ m 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 nine volumes of biotin and one volume of streptavidin-modified beads (4.5 ng μ l –1 of streptavidin) and reaches ∼400% higher values when equal volumes of biotin and streptavidin-coated beads (22.5 ng μ l –1 of streptavidin) were mixed.