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(a) The pre-concentration dynamics of silica nano-colloids under nDEP at different frequencies ((b) 100 KHz, (c) 150 KHz, (d) 400KHz, (e) 800 kHz), with opposing EO, is quantified using the dynamic ROI method and fit at early time points (Table I) to compare relative polarizability differences with frequency in (f) (details in Table II), to quantify the polarizability dispersion as per the shell model in (g).
