Thermophoretic Random Walks and Enhancement of Diffusion

Area of Science:

• Physical Chemistry
• Nanotechnology
• Biophysics

Background:

• Spontaneous nanoscale energy events (endo- or exothermal) occur in liquids.
• These events resemble elementary acts in enzymatic reactions, releasing or absorbing energy rapidly (picoseconds).
• Such events create transient local temperature spikes and gradients.

Purpose of the Study:

• To investigate the contribution of stochastic thermodiffusion to diffusion enhancement.
• To understand how nanoscale energy fluctuations influence particle mobility in liquids.
• To correlate theoretical findings with experimental data on enzymatic reactions.

Main Methods:

• Theoretical study of thermodiffusion in particle suspensions.
• Modeling of nanoscale energy events and their impact on local temperature.
• Analysis of thermodiffusion random walks as enhanced diffusion.

Main Results:

• Stochastic thermodiffusion can significantly enhance particle diffusion.
• This enhancement is observed when nanoscale energy absorption/generation is sufficiently high.
• The evaluated contribution aligns with experimental data from enzymatic reactions.

Conclusions:

• Nanoscale energy events drive stochastic thermodiffusion, enhancing molecular mobility.
• This mechanism provides a plausible explanation for enhanced diffusion observed in systems like enzymatic reactions.
• The study validates the role of thermodiffusion in non-equilibrium systems.