TY - JOUR
T1 - Nonlinear Electrophoresis of Highly Charged Nonpolarizable Particles
AU - Tottori, Soichiro
AU - Misiunas, Karolis
AU - Keyser, Ulrich F.
AU - Bonthuis, Douwe Jan
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Nonlinear field dependence of electrophoresis in high fields has been investigated theoretically, yet experimental studies have failed to reach consensus on the effect. In this Letter, we present a systematic study on the nonlinear electrophoresis of highly charged submicron particles in applied electric fields of up to several kV/cm. First, the particles are characterized in the low-field regime at different salt concentrations and the surface charge density is estimated. Subsequently, we use microfluidic channels and video tracking to systematically characterize the nonlinear response over a range of field strengths. Using velocity measurements on the single particle level, we prove that nonlinear effects are present at electric fields and surface charge densities that are accessible in practical conditions. Finally, we show that nonlinear behavior leads to unexpected particle trapping in channels.
AB - Nonlinear field dependence of electrophoresis in high fields has been investigated theoretically, yet experimental studies have failed to reach consensus on the effect. In this Letter, we present a systematic study on the nonlinear electrophoresis of highly charged submicron particles in applied electric fields of up to several kV/cm. First, the particles are characterized in the low-field regime at different salt concentrations and the surface charge density is estimated. Subsequently, we use microfluidic channels and video tracking to systematically characterize the nonlinear response over a range of field strengths. Using velocity measurements on the single particle level, we prove that nonlinear effects are present at electric fields and surface charge densities that are accessible in practical conditions. Finally, we show that nonlinear behavior leads to unexpected particle trapping in channels.
UR - http://www.scopus.com/inward/record.url?scp=85069002040&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.123.014502
DO - 10.1103/PhysRevLett.123.014502
M3 - Article
C2 - 31386414
AN - SCOPUS:85069002040
SN - 0031-9007
VL - 123
JO - Physical Review Letters
JF - Physical Review Letters
IS - 1
M1 - 014502
ER -