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- W3132963492 abstract "Accurate determination of elasticity below the microscale through indentation measurements on soft materials is difficult as this is beyond the limits of conventional contact mechanical models. Surface energy contributions dominate the interaction and preclude accurate determination of bulk material elasticity. As a solution to this problem a non-contact measuring method in liquid was developed on the Surface Force Apparatus (SFA) that allows for an absolute determination of elasticity without solid-solid contact. While successful, the SFA has limitations in terms of compatible sample thickness and frequency range due to the macroscopic size of the employed probe. In this manuscript we report on implementation of the non-contact measuring technique on an Atomic Force Microscope (AFM platform), where smaller probes can be used and a higher frequency range is available. Conventional mechanical piezo acoustic excitation of the AFM probe was found to be here experimentally insufficient. A capacitive excitation scheme was developed to resolve this. To implement and explore this new excitation scheme a homemade AFM setup was rebuilt. The performance of this rebuild AFM is demonstrated by performing reference measurements on a rigid substrate in PDMS oil and deionized water. We additionally report on the investigation of p-NIPAM polymer brush surfaces using AFM, where we found a previously unreported bridging interaction below the lower critical solution temperature. Lastly we report on the investigation of quick clay, a soil type associated with landslides. We demonstrate the capability of AFM to investigate the clay microstructure in its natural water saturated state and explore the mechanical properties of clay on the micro- and nanoscale. These results open the door for afm to contribute in answering key questions in the eld of clay geology." @default.
- W3132963492 created "2021-03-01" @default.
- W3132963492 creator A5048518355 @default.
- W3132963492 date "2020-11-06" @default.
- W3132963492 modified "2023-09-23" @default.
- W3132963492 title "Towards a non-contact determination of the mechanical properties of soft condensed matter using AFM" @default.
- W3132963492 hasPublicationYear "2020" @default.
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