Microelectrode Size Calculator

Steady-state UME theory · Zoski–Mirkin (2002) · RG-corrected limiting current

Solving for r r = π · I_lim / (X · n · F · D · C)

Sheath Ratio RG = r_glass / r_electrode X = 4.0794

10.0

RG 1.1RG 10.0

X is linearly interpolated from the Zoski–Mirkin (2002) table (RG 1.1–10.0). At large RG the classical form I_lim = 4nFDCr is recovered.

Redox Species

Limiting Current (I_lim)

Electrons Transferred (n)

—

Diffusion Coefficient (D)

cm²/s

Concentration (C)

Results

Radius

—

Radius

—

µm

Radius

—

Disk Area

—

µm²

Formula σ = √(2 · D · t)

Redox Species

Diffusion Coefficient (D)

cm²/s

Time (t)

Results

σ (Diffusion Layer)

—

µm

—

Formula t_dif = r² / (2 · D)

Redox Species

Radius (r)

µm

Diffusion Coefficient (D)

cm²/s

Results

t_dif

—

t_dif

—

t_dif

—

µs