Piezoelectric AFM Probe for Rapid Liquid Imaging
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Solution Overview
Problem
Current atomic force microscopy (AFM) techniques are limited by slow imaging speeds in liquid environments, which hinder the study of dynamic biological and chemical processes, as they require several minutes to produce a 512×512 pixel image and are not suitable for real-time imaging of processes occurring within minutes.
Innovation Solution
A liquid cell for AFM with a cantilevered probe actuated by a piezoelectric drive element, coupled to the liquid cell housing, allowing for quicker imaging and sensing of target species through conductive feedthroughs and a treated section on the probe that responds to target species by deflection or resonant frequency shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional AFM techniques are used in liquid environments, then imaging can be performed on biological samples, but imaging speed is slow requiring several minutes to produce a 512×512 pixel image
Solution Approach 1:
The patent employs a piezoelectrically actuated microcantilevered probe that vibrates at high frequency to perform rapid scanning of the sample surface. The mechanical vibration enables the probe to quickly traverse the imaging area, dramatically increasing imaging speed compared to conventional static or slowly moving probes, thus reducing the time required to produce high-resolution images.
Solution Approach 2:
The patent replaces conventional mechanical scanning systems with a piezoelectrically driven resonant scanning mechanism. The piezoelectric actuator converts electrical signals directly into mechanical vibrations of the cantilever, eliminating the need for slow mechanical stage movements and enabling rapid imaging through resonant oscillation at optimized frequencies.
2Productivity
If conventional AFM probes are used, then basic imaging is achieved, but real-time monitoring of dynamic processes occurring within minutes is not possible
Solution Approach 1:
The patent utilizes periodic oscillation of the microcantilevered probe at its resonant frequency to continuously scan the sample surface. This periodic action enables repeated rapid measurements over time, allowing real-time monitoring of dynamic biological and chemical processes as they occur, with time resolution sufficient to capture events unfolding within minutes.
3Speed
If a piezoelectrically actuated microcantilevered probe is used, then faster imaging is achieved, but integration with liquid cell housing and electrical connections becomes complex
Solution Approach 1:
The patent integrates the piezoelectric actuator, microcantilevered probe, and liquid cell housing into a unified assembly. The piezoelectric elements are incorporated directly within the probe structure, and electrical feedthroughs are seamlessly integrated into the liquid cell housing, reducing the number of separate components and simplifying the overall system integration despite the advanced functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables faster imaging and sensing capabilities, allowing for real-time monitoring of dynamic phenomena in liquid environments, reducing imaging time and improving the study of biological and chemical processes.
Implementation Method 1
a cantilevered probe actuated by a piezoelectric drive element
Implementation Method 2
a treated section on the probe that responds to target species by deflection or resonant frequency shifts
Data Source
AI summary
The invention provides a liquid cell for an atomic force microscope. The liquid cell includes a liquid cell housing with an internal cavity to contain a fluid, a plurality of conductive feedthroughs traversing the liquid cell housing between the internal cavity and a dry side of the liquid cell, a cantilevered probe coupled to the liquid cell housing, and a piezoelectric drive element disposed on the cantilevered probe. The cantilevered probe is actuated when a drive voltage is applied to the piezoelectric drive element through at least one of the conductive feedthroughs. A method of imaging an object in a liquid medium and a method of sensing a target species with the liquid cell are also disclosed.