Cyclic Epipedography Microsphere Contact Angle Monitoring
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Solution Overview
Problem
Monitoring atomic and molecular events on nonporous surfaces using contact angles is challenging due to ill-defined surfaces and limitations of existing experimental methods.
Innovation Solution
The use of cyclic epipedographs obtained during cycles of dipping a microsphere or rod into water or a solution and lifting it, to estimate the contact angle and monitor chemical processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact angle measurement is used to monitor chemical processes on nonporous surfaces, then surface wetting characteristics can be monitored, but the measurement precision deteriorates due to ill-defined surfaces at atomic scales
Solution Approach 1:
The patent introduces an intermediary liquid bridge between the sphere and plate that mediates the interaction and allows indirect measurement of surface properties. The liquid bridge acts as a mediator that translates atomic-scale surface characteristics into macroscopic measurable quantities like contact angle and bridge geometry, resolving the measurement precision issue on ill-defined surfaces.
Solution Approach 2:
The patent employs a spherical object instead of a traditional flat probe to interact with the surface. The curved surface of the sphere creates a well-defined geometric configuration that, when combined with the liquid bridge, produces measurable contact angles and bridge profiles that are sensitive to surface properties despite the atomic-scale roughness of the nonporous surface.
2Measurement precision
If traditional contact angle methods are used, then surface properties can be characterized, but the device complexity increases due to ill-defined surfaces and experimental method limitations
Solution Approach 1:
The patent segments the measurement system into distinct functional components: a controlled sphere-plate geometry, a liquid bridge formation zone, and measurement regions for contact angle and bridge profile. This segmentation allows each component to be optimized and measured independently, reducing overall experimental complexity while maintaining measurement precision.
Solution Approach 2:
The patent utilizes changes in liquid bridge parameters (volume, shape, contact angle) as the sphere approaches or contacts the plate to extract surface property information. By monitoring dynamic parameter changes rather than static properties, the system achieves accurate surface characterization with simpler experimental setup compared to traditional methods.
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
This method allows for the effective monitoring of chemical processes by inferring the current state based on contact angle changes, providing insights into surface wetting characteristics and chemical reactions.
Implementation Method 1
a waterline defined at a top or a bottom of a meniscus of water or the solution on the microsphere or rod
Implementation Method 2
contact angle changes in dipping a microsphere into a liquid and lifting from it
Data Source
AI summary
Cyclic epipedography is described and used to monitor the wetting characteristics of a microsphere on a stem with a liquid by tracking the level of a liquid line on sphere when the sphere is dipped into and lifted from the liquid. The level of the liquid plane at infinity changes with respect to the microsphere. Analysis of still images of a video taken with a horizontally held microscope determines the two levels. The microsphere allows viewing of the liquid line without being obscured by the meniscus the liquid forms with its container's wall. The position and shape of the CE allow the contact angle to be estimated at different stages in the dip-lift cycle. Amphiphilic aminopropylsilane may be used to make the surface conform to the environment. In air, the hydrophobic portion comes on top, while in water, hydrophilic part faces the surroundings. This conformity-caused Janus characteristics of the surface were almost absent with the hydroxylated silica and weak with the octylsilane-treated silica.