Nanomechanical Molecular Mass Sensing Using Suspended Microchannel Resonators

Area of Science:

• Physics
• Materials Science
• Chemical Engineering

Background:

• Microchannel resonators are sensitive devices for fluid analysis.
• Hydrostatic pressure can alter resonator properties, but its effects on mass are not fully understood.

Purpose of the Study:

• To investigate the phenomena occurring when hydrostatic pressure is applied to the inner fluid of a suspended microchannel resonator.
• To develop a method for characterizing fluid properties using pressure-induced effects in microchannel resonators.

Main Methods:

• Theoretical prediction and experimental demonstration of pressure-induced mass effects.
• Characterization of resonator frequency response as a function of fluid compressibility and molecular mass.
• Utilizing the device to measure mass density of liquids and average molecular mass of gas mixtures.

Main Results:

• Pressure-induced stiffness and mass effects were observed and quantified.
• The device achieved a mass density resolution of 0.7 µg/mL for liquids.
• Gas mixture characterization with a resolution of 0.01 atomic mass units for average molecular mass was demonstrated.

Conclusions:

• Hydrostatic pressure in microchannel resonators induces significant mass effects, enabling novel characterization methods.
• The developed resonator offers high-resolution capabilities for both liquid density and gas mixture analysis.
• This technology has potential applications in chemical sensing and fluid characterization.