Searched for: author%3A%22Ghatkesar%2C+M.K.%22
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Gunda, Arun (author), Özkayar, G. (author), Tichem, M. (author), Ghatkesar, M.K. (author)
Microvalves are important flow-control devices in many standalone and integrated microfluidic applications. Polydimethylsiloxane (PDMS)-based pneumatic microvalves are commonly used but they generally require large peripheral connections that decrease portability. There are many alternatives found in the literature that use Si-based microvalves,...
journal article 2020
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Nouri Goushki, M. (author), Mirzaali, Mohammad J. (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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Ganjian, M. (author), Angeloni, L. (author), Mirzaali, Mohammad J. (author), Modaresifar, K. (author), Hagen, C.W. (author), Ghatkesar, M.K. (author), Hagedoorn, P.L. (author), Fratila-Apachitei, E.L. (author), Zadpoor, A.A. (author)
One of the methods to create sub-10 nm resolution metal-composed 3D nanopillars is electron beam-induced deposition (EBID). Surface nanotopographies (e.g., nanopillars) could play an important role in the design and fabrication of implantable medical devices by preventing the infections that are caused by the bacterial colonization of the...
journal article 2020
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Gunda, Arun (author), Özkayar, G. (author), Tichem, M. (author), Ghatkesar, M.K. (author)
Microvalves are important flow-control components in many standalone and integrated microfluidic circuits. Although there is a large body of work regarding<br/>microvalves, there is still a need for an easyto-fabricate, small-footprint, low-power device that can control both liquids and gases at moderate pressures. This paper details the...
conference paper 2019
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van den Brink, Bram (author), Alijani, F. (author), Ghatkesar, M.K. (author)
An experimental setup to perform dynamic analysis of a micro- and nano-mechanical system in vacuum, gas, and liquid is presented. The setup mainly consists of a piezoelectric excitation part and the chamber that can be either evacuated for vacuum, or filled with gas or water. The design of the piezoelectric actuator was based on a Langevin...
journal article 2019
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Dolleman, R.J. (author), Hsu, Z. (author), Vollebregt, S. (author), Sader, John E. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author), Ghatkesar, M.K. (author)
Current wafer-scale fabrication methods for graphene-based electronics and sensors involve the transfer of single-layer graphene by a support polymer. This often leaves some polymer residue on the graphene, which can strongly impact its electronic, thermal, and mechanical resonance properties. To assess the cleanliness of graphene fabrication...
journal article 2019
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Frota Sartori, A. (author), Belardinelli, P. (author), Dolleman, R.J. (author), Steeneken, P.G. (author), Ghatkesar, M.K. (author), Buijnsters, J.G. (author)
Diamond is a highly desirable material for state-of-the-art micro-electromechanical (MEMS) devices, radio-frequency filters and mass sensors, due to its extreme properties and robustness. However, the fabrication/integration of diamond structures into Si-based components remain costly and complex. In this work, a lithography-free, low-cost...
journal article 2019
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Liu, Z. (author), Ghatkesar, M.K. (author), Sudhölter, Ernst J. R. (author), Singh, Binder (author), Kumar, N. (author)
Surfactants have the ability to mobilize residual oil trapped in pore spaces of matrix rocks by lowering the oil-water interfacial tension, resulting in a higher oil recovery. However, the loss of surfactants by adsorption onto the rock surface has become a major concern that reduces the efficiency of the surfactant flooding process. In this...
journal article 2019
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Waasdorp, R. (author), van den Heuvel, Oscar (author), Versluis, Floyd (author), Hajee, Bram (author), Ghatkesar, M.K. (author)
Desktop inkjet printers are ubiquitous and relatively inexpensive among the variety of available printers. These inkjet printers use an array of micro fluidic pumps, nozzles based on piezoelectric actuation, to dispense individual picoliter volume ink droplets at high speed. In this paper, we show that individual pumps in desktop printers can be...
journal article 2018
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Mehrali, M. (author), Ghatkesar, M.K. (author), Pecnik, Rene (author)
The wide-spread adoption of solar thermal absorbers is currently hampered by their low absorption efficiencies and their high capital cost. As a result, a number of initiatives, including direct absorption solar collectors (DASC), are currently underway to improve the absorber efficiencies. In this regard, this study focused on application of...
journal article 2018
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Belardinelli, P. (author), Hauzer, L. M.F.R. (author), Siskins, M. (author), Ghatkesar, M.K. (author), Alijani, F. (author)
Physical characteristics such as mass and stiffness of biological objects are emerging as new markers for severe diseases. Micromechanical resonators can be used to quantify multiple of these characteristics simultaneously. In this paper, we propose a methodology that utilizes higher flexural modes of vibration to perform simultaneous...
journal article 2018
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Kacker, R. (author), Dhingra, Sanjana (author), Irimia, D. (author), Ghatkesar, M.K. (author), Stankiewicz, A.I. (author), Kramer, H.J.M. (author), Eral, H.B. (author)
Various mechanisms have been proposed to explain the nonphotochemical laser-induced nucleation (NPLIN). Identifying the dominant mechanism requires addressing a large set of experimental parameters with a statistically significant number of samples, forced by the stochastic nature of nucleation. In this study, with aqueous KCl system, we...
journal article 2018
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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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Cao, Xi (author), Gruiter, Rick de (author), van Oorschot, Ralph (author), Baldi, S. (author), Hassan HosseinNia, S. (author), Ghatkesar, M.K. (author)
A hollow microcantilever is used instead of a conventional microcantilever to dispense and aspirate liquids in the femto-litre (10<sup>-15</sup> L) volume range in an atomic force microscope (AFM) setup. The inherent force sensing capability of the cantilever is used to monitor the fluid manipulation in-situ. At this small scale, parameters...
journal article 2017
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de Laat, Marcel (author), Perez Garza, H.H. (author), Ghatkesar, M.K. (author)
The choice on which type of cantilever to use for Atomic Force Microscopy (AFM) depends on the type of the experiment being done. Typically, the cantilever has to be exchanged when a different stiffness is required and the entire alignment has to be repeated. In the present work, a method to adjust the stiffness in situ of a commercial AFM...
journal article 2016
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de Laat, M.L.C. (author), Perez Garza, H.H. (author), Herder, J.L. (author), Ghatkesar, M.K. (author)
In situ stiffness adjustment in microelectromechanical systems is used in a variety of applications such as radio-frequency mechanical filters, energy harvesters, atomic force microscopy, vibration detection sensors. In this review we provide designers with an overview of existing stiffness adjustment methods, their working principle, and...
journal article 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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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
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Zhu, S.E. (author), Ghatkesar, M.K. (author), Zhang, C. (author), Janssen, G.C.A.M. (author)
We present a pressure sensor based on the piezoresistive effect of graphene. The sensor is a 100?nm thick, 280??m wide square silicon nitride membrane with graphene meander patterns located on the maximum strain area. The multilayer, polycrystalline graphene was obtained by chemical vapor deposition. Strain in graphene was generated by applying...
journal article 2013
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