Searched for: author%3A%22Staufer%2C+U.%22
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Mariello, M. (author), Blad, Thijs (author), Mastronardi, V. M. (author), Madaro, F. (author), Guido, F. (author), Staufer, U. (author), Tolou, N. (author), De Vittorio, M. (author)
There is a high demand for novel flexible micro-devices for energy harvesting from low-frequency and random mechanical sources. The research of new functional designs is required to strategically enhance the performances and to increase the control on mechanical flexibility. In this work we report the fabrication and characterization of bi...
journal article 2021
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ANDREW, PHILIPPA KATE (author), RAUDSEPP, ALLAN (author), Fan, D. (author), Staufer, U. (author), WILLIAMS, MARTIN A.K. (author), AVCI, EBUBEKIR (author)
Optical microrobotics is an emerging field that has the potential to improve upon current optical tweezer studies through avenues such as limiting the exposure of biological molecules of interest to laser radiation and overcoming the current limitations of low forces and unwanted interactions between nearby optical traps. However, optical...
journal article 2021
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Chandrashekar, A. (author), Belardinelli, P. (author), Lenci, Stefano (author), Staufer, U. (author), Alijani, F. (author)
Increasing the signal-to-noise ratio in dynamic atomic force microscopy plays a key role in nanomechanical mapping of materials with atomic resolution. In this work, we develop an experimental procedure for increasing the sensitivity of higher harmonics of an atomic-force-microscope cantilever without modifying the cantilever geometry but...
journal article 2021
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Verlinden, E.J. (author), Madadelahi, M. (author), Sarajlic, E. (author), Shamloo, A. (author), Engel, A.H. (author), Staufer, U. (author), Ghatkesar, M.K. (author)
We introduce a two-channel microfluidic atomic force microscopy (AFM) cantilever that combines the nanomechanical sensing functionality of an AFM cantilever with the ability to manipulate fluids of picolitres or smaller volumes through nanoscale apertures near the cantilever tip. Each channel is connected to a separate fluid reservoir, which...
journal article 2020
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Belardinelli, P. (author), D Souza, Savio (author), Verlinden, E.J. (author), Wei, J. (author), Staufer, U. (author), Alijani, F. (author), Ghatkesar, M.K. (author)
Suspended microfluidic resonators enable detection of fluid density and viscosity with high sensitivity. Here, a two-legged suspended microchannel resonator that probes pico-litres of liquid is presented. The higher resonant modes (flexural and torsional) were explored for increased sensitivity and resolution. Unlike other reported microchannel...
journal article 2020
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van der Velden, Gijs (author), Fan, D. (author), Staufer, U. (author)
Organ-on-chip (OoC) technology is increasingly used for biomedical research and to speed up the process of bringing a drug from lab to the market. The main fluidic components of an OoC device are microfluidic channels and porous membranes arranged in three dimensions. Current chips are often assembled from several parts. In the development...
journal article 2020
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Nouri Goushki, M. (author), Mirzaali Mazandarani, M. (author), Angeloni, L. (author), Fan, D. (author), Minneboo, M.B. (author), Ghatkesar, M.K. (author), Staufer, U. (author), Fratila-Apachitei, E.L. (author), Zadpoor, A.A. (author)
Fabricating large areas of geometrically complex and precisely controlled topographies is required for the studies of cell behavior on patterned surfaces. Direct laser writing (DLW) is an advanced 3D-fabrication technique, which facilitates the manufacturing of structures within various scales (from a few hundred nanometers to millimeters)....
journal article 2020
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Andrew, Philippa Kate (author), Fan, D. (author), Raudsepp, Allan (author), Lofroth, Matthew (author), Staufer, U. (author), Williams, Martin A.K. (author), Avci, Ebubekir (author)
Advances in nanofabrication over the past twenty years have enabled the creation and use of ever-more interesting and useful micromachines. Optical micromachines are a particularly attractive subset of these for researchers in biological and soft-matter sciences, due to their potential to aid in optical tweezer studies of laser-sensitive...
conference paper 2020
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Nouri Goushki, M. (author), Sharma, Abhishek (author), Sasso, L. (author), Zhang, Shuang (author), van der Eerden, B.C.J. (author), Staufer, U. (author), Fratila-Apachitei, E.L. (author), Zadpoor, A.A. (author)
Manufacturing high throughput in vitro models resembling the tissue microenvironment is highly demanded for studying bone regeneration. Tissues such as bone have complex multiscale architectures inside which cells reside. To this end, engineering a microfluidic platform incorporated with three-dimensional (3D) microscaffolds and submicron...
journal article 2019
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Fan, D. (author), Staufer, U. (author), Accardo, A. (author)
The realization of biomimetic microenvironments for cell biology applications such as organ-on-chip, in vitro drug screening, and tissue engineering is one of the most fascinating research areas in the field of bioengineering. The continuous evolution of additive manufacturing techniques provides the tools to engineer these architectures at...
journal article 2019
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Puce, Salvatore (author), Sciurti, Elisa (author), Rizzi, Francesco (author), Spagnolo, Barbara (author), Qualtieri, Antonio (author), De Vittorio, Massimo (author), Staufer, U. (author)
This work aims at developing a new and unconventional Sacrificial Stencil Mask (SSM) technology by exploiting Two-Photon Polymerization (2PP) in an IP-L/SU-8 double layer resist system. The process consists of the sequential deposition of two different resists, such as SU-8 and IPL, onto the same glass substrate, followed by 2PP lithography...
journal article 2019
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Chandrashekar, A. (author), Belardinelli, P. (author), Staufer, U. (author), Alijani, F. (author)
In this work, we perform a comprehensive analysis of the robustness of attractors in tapping mode atomic force microscopy. The numerical model is based on cantilever dynamics driven in the Lennard–Jones potential. Pseudo-arc-length continuation and basins of attraction are utilized to obtain the frequency response and dynamical integrity of...
journal article 2019
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Schwender, J. (author), Tsioutsios, I. (author), Tavernarakis, A. (author), Dong, Quan (author), Jin, Yong (author), Staufer, U. (author), Bachtold, A. (author)
We report on an electrical detection method of ultrasensitive carbon nanotube mechanical resonators. The noise floor of the detection method is reduced using a RLC resonator and an amplifier based on a high electron mobility transistor cooled at 4.2 K. This allows us to resolve the resonance frequency of nanotube resonators with an...
journal article 2018
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Gramazio, F. (author), Lorenzoni, M. (author), Perez-Murano, F. (author), Rull Trinidad, E. (author), Staufer, U. (author), Fraxedas, J. (author)
journal article 2017
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Belardinelli, P. (author), Ghatkesar, M.K. (author), Staufer, U. (author), Alijani, F. (author)
Linear and non-linear vibrations of a U-shaped hollow microcantilever beam filled with fluid and interacting with a small particle are investigated. The microfluidic device is assumed to be subjected to internal flowing fluid carrying a buoyant mass. The equations of motion are derived via extended Hamilton's principle and by using Euler...
journal article 2017
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Rull Trinidad, E. (author), Gribnau, T.W. (author), Belardinelli, P. (author), Staufer, U. (author), Alijani, F. (author)
The accuracy of measurements in Amplitude Modulation Atomic Force Microscopy (AFM) is directly related to the geometry of the tip. The AFM tip is characterized by its radius of curvature, which could suffer from alterations due to repetitive mechanical contact with the surface. An estimation of the tip change would allow the user to assess...
journal article 2017
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Fanzio, P. (author), Tichem, M. (author), Staufer, U. (author), Sasso, L. (author)
abstract 2016
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Pérez Garza, H. (author), Ghatkesar, M.K. (author), Basak, S. (author), Löthman, P. (author), Staufer, U. (author)
To manipulate liquid matter at the nanometer scale, we have developed a robotic assembly equipped with a hollow atomic force microscope (AFM) cantilever that can handle femtolitre volumes of liquid. The assembly consists of four independent robots, each sugar cube sized with four degrees of freedom. All robots are placed on a single platform...
journal article 2015
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Van Oorschot, R. (author), Perez Garza, H.H. (author), Derks, R.J.S. (author), Staufer, U. (author), Ghatkesar, M.K. (author)
We present the development of a microfluidic AFM (atomic force microscope) cantilever-based platform to enable the local dispensing and aspiration of liquid with volumes in the pico-to-femtoliter range. The platform consists of a basic AFM measurement system, microfluidic AFM chip, fluidic interface, automated substrate alignment, external...
journal article 2015
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Perez Garza, H.H. (author), Kievit, E.W. (author), Schneider, G.F. (author), Staufer, U. (author)
Mechanically straining graphene opens the possibility to exploit new properties linked to the stressed lattice of this two-dimensional material. In particular, theoretical analyses have forecast that straining graphene by more than 10% is a requirement for many novel applications that have not yet been experimentally demonstrated. Recently, we...
journal article 2014
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