document

All-polymer microelectrode fabrication via high-throughput soft embossing

Fanzio, P. (author), Tichem, M. (author), Staufer, U. (author), Sasso, L. (author)

abstract 2016

document

Preliminary identification of minerals in silt- and sand-size grains on mars from phoenix om images using three-channel color photometry

Velbel, M.A. (author), Goetz, W. (author), Hecht, M.H. (author), Hviid, S.F. (author), Madsen, M.B. (author), Pike, W.T. (author), Staufer, U. (author)

abstract 2014

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Suspended photonic waveguide arrays for submicrometer alignment

Peters, T.J. (author), Tichem, M. (author), Staufer, U. (author)

This paper presents a new alignment concept for the alignment of multichannel photonic intergrated circuits (PICs) using flexible photonic waveguides on one of the PICs that are positionable by integrated micro electro mechanical system (MEMS) actuators. The concept aims for high precision and high degree of assembly process automation. The...

conference paper 2014

document

Systematic approach for tolerance analysis of photonic systems

Van Gurp, J.F.C. (author), Tichem, M. (author), Staufer, U. (author)

Passive alignment of photonic components is an assembly method compatible with a high production volume. Its precision performance relies completely on the dimensional accuracies of geometrical alignment features. A tolerance analysis plays a key role in designing and optimizing these passive alignment features. The objective of this paper is to...

conference paper 2011

document

Design of optical micromachines for use in biologically relevant environments

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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Developing an Optical Microlever for Stable and Unsupported Force Amplification

Andrew, Philippa Kate (author), Raudsepp, Allan (author), Nock, Volker (author), Fan, D. (author), Williams, Martin A.K. (author), Staufer, U. (author), Avci, Ebubekir (author)

Optical micromachines have the potential to improve the capabilities of optical tweezers by amplifying forces and allowing for indirect handling and probing of specimens. However, systematic design and testing of micromachine performance is still an emerging field. In this work we have designed and tested an unsupported microlever, suitable for...

conference paper 2022

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Remote nanoimaging on Mars: Results of the Atomic Force Microscope onboard NASA's Phoenix Mission

Gautsch, D. (author), Parrat, D. (author), De Rooij, N. (author), Staufer, U. (author), Marookian, J.M. (author), Hecht, M. (author), Vijendran, S. (author), Sykulska, H. (author), Pike, T.W. (author)

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

journal article 2011

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Microscopy analysis of soils at the Phoenix landing site, Mars: Classification of soil particles and description of their optical and magnetic properties

Goetz, W. (author), Pike, W.T. (author), Hviid, S.F. (author), Madsen, M.B. (author), Morris, R.V. (author), Hecht, M.H. (author), Staufer, U. (author), Leer, K. (author), Sykulska, H. (author), Hemmig, E. (author), Marshall, J. (author), Morookian, J.M. (author), Parrat, D. (author), Vijendran, S. (author), Bos, B.J. (author), El Maarry, M.R. (author), Keller, H.U. (author), Kramm, R. (author), Markiewicz, W.J. (author), Drube, L. (author), Blaney, D. (author), Arvidson, R.E. (author), Bell, J.F. (author), Reynolds, R. (author), Smith, P.H. (author), Woida, P. (author), Woida, R. (author), Tanner, R. (author)

The optical microscope onboard the Phoenix spacecraft has returned color images (4 ?m pixel?1) of soils that were delivered to and held on various substrates. A preliminary taxonomy of Phoenix soil particles, based on color, size, and shape, identifies the following particle types [generic names in brackets]: (1) reddish fines, mostly unresolved...

journal article 2010

document

Scanning Probe Microscope-Based Fluid Dispensing

Ghatkesar, M.K. (author), Perez Garza, H.H. (author), Heuck, F. (author), Staufer, U. (author)

Advances in micro and nano fabrication technologies have enabled fabrication of smaller and more sensitive devices for applications not only in solid-state physics but also in medicine and biology. The demand for devices that can precisely transport material, specifically fluids are continuously increasing. Therefore, integration of various...

journal article 2014

document

Highly strained graphene samples of varying thickness and comparison of their behaviour

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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Effects of size and defects on the elasticity of silicon nanocantilevers

Sadeghian, H. (author), Yang, C.K. (author), Goosen, J.F.L. (author), Bossche, A. (author), Staufer, U. (author), French, P.J. (author), Van Keulen, F. (author)

The size-dependent elastic behavior of silicon nanocantilevers and nanowires, specifically the effective Young’s modulus, has been determined by experimental measurements and theoretical investigations. The size dependence becomes more significant as the devices scale down from micro- to nano-dimensions, which has mainly been attributed to...

journal article 2010

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A microfluidic AFM cantilever based dispensing and aspiration platform

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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Scanning gate microscopy measurements on a superconducting single-electron transistor

Huefner, M. (author), May, C. (author), Ki?in, S. (author), Ensslin, K. (author), Ihn, T. (author), Hilke, M. (author), Suter, K. (author), De Rooij, N.F. (author), Staufer, U. (author)

We present measurements on a superconducting single-electron transistor (SET) in which the metallic tip of a low-temperature scanning force microscope is used as a movable gate. We characterize the SET through charge stability diagram measurements and compare them to scanning gate measurements taken in the normal conducting and the...

journal article 2009

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6 DOF Force and Torque Sensor for Micro-manipulation Applications

Estevez, P. (author), Bank, J. (author), Porta, M. (author), Wei, J. (author), Sarro, P.M. (author), Tichem, M. (author), Staufer, U. (author)

This paper presents the design, fabrication and characterization of a piezoresistive 6 Degrees of Freedom (DOF) force and torque sensor to be used in micro-manipulation. The mechanical structure of the device consists of 7 suspended beams and a calibration structure, which can be replaced by micro-manipulation tools such as micro-grippers or...

journal article 2011

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Nano-Workbench: A Combined Hollow AFM Cantilever and Robotic Manipulator

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

document

Low voltage electroosmotic pump for high density integration into microfabricated fluidic systems

Heuck, F.C.A. (author), Staufer, U. (author)

A low voltage electroosmotic (eo) pump suitable for high density integration into microfabricated fluidic systems has been developed. The high density integration of the eo pump required a small footprint as well as a specific on-chip design to ventilate the electrolyzed gases emerging at the platinum (Pt) electrodes. For this purpose, a novel...

journal article 2011

document

Quantifying nanoscale forces using machine learning in dynamic atomic force microscopy

Chandrashekar, A. (author), Belardinelli, P. (author), Bessa, M.A. (author), Staufer, U. (author), Alijani, F. (author)

Dynamic atomic force microscopy (AFM) is a key platform that enables topological and nanomechanical characterization of novel materials. This is achieved by linking the nanoscale forces that exist between the AFM tip and the sample to specific mathematical functions through modeling. However, the main challenge in dynamic AFM is to quantify...

journal article 2022

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Polymer nano manufacturing of a biomimicking surface for kidney stone crystallization studies

Pleeging, R.M.B. (author), Ibis, F. (author), Fan, D. (author), Sasso, L. (author), Eral, H.B. (author), Staufer, U. (author)

Detected kidney stone cases are increasing globally, yet knowledge on the conditions for stone formation is lacking. Experimental approaches mimicking the micro-environmental conditions present in vivo can help sci-entists untangle intertwined physiochemical and biological phenomena leading to kidney stone formation. As crystal nucleation often...

journal article 2021

document

Engineered 3D Polymer and Hydrogel Microenvironments for Cell Culture Applications

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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Second flexural and torsional modes of vibration in suspended microfluidic resonator for liquid density measurements

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