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PhD Graduates 2018

To give an impression of what it is like to be a PhD student at MESA+, we interview all finishing students and ask them to share their experience

Zinaida Kostiuchenko ’Mass flow in electrochemical nanofluidic detectors’ In this thesis nanogap devices were studied using amplification through redox cyling of analyte molecules between two parallel, closely spaced electrodes. Dennis Alveringh ‘Integrated throughflow mechanical microfluidic sensors’ In this thesis are described: novel designs, fabrication methods and experiments of microfluidic sensors that use a mechanical transduction principle. ‘They can be integrated, throughflow, with other sensors on a single chip,’ says Dennis Alveringh. Rogier van den Bos ‘Hydrogen induced blister formation in heterogeneous structures’ In this thesis blister formation in multilayer systems was central. ‘We studied how stabilized blisters are formed in nanometer thick molybdenum/silicium multilayers, under the building up of hydrogen pressure,’ Rogier van den Bos says. ‘A model description of the growth and stability of blisters by elastic deformation within the multilayers was developed.’ Anne Benneker ‘From small to big: Ion transport at interfaces’ In this work, ion transport at charge selective interfaces is investigated. ‘This is important in a multitude of technologies,’ says Anne Benneker. ‘Electrochemical cells, such as fuel cells, and electrodialysis both serve as good examples.’ Timon Rijnaarts ‘The role of membranes in the use of natural salinity gradients for reverse electrodialysis' In this thesis reverse electrodialysis (RED) is central in which energy is harvested from a salinity gradient. For RED, two streams with a difference in salinity are used in combination with ion exchange membranes. Jeroen Huijben ‘Interfacial phenomena in atomically engineered LaAlO3/SrTiO3 heterostructures’ In this thesis a complex oxide is central. These type of materials are interesting as they exhibit spectacular phenomena including: colossal magnetoresistance, high transition temperature superconductivity, ferromagnetism and ferroelectricity. Celestine Lawrence ‘Evolving networks to have intelligence realized at nanoscale (ENTHIRAN)’ In this thesis the shrinking down of hardware feature sizes is the central base for research. ‘This can lead to packing densities beyond the scope of human design,’ Celestine Lawrence says. ‘Going beyond current CMOS technology, however, involves imperfections and other unintended physical effects. Alexander Milbrat ‘Electrochemical coating of micro-structured silicon for photoelectrochemical water splitting’ In this thesis the focus is on the development of materials for photoelectrochemical devices, applicable in solar-driven hydrogen generation from water splitting. Gulistan Kocer ‘Cell-instructive biointerfaces with dynamic complexity’ In this thesis chemical approaches inspired by the extracellular environment are explored. ‘We aim to fabricate cell-instructive biointerfaces,’ says Gulistan Koçer. ‘Light-responsive liquid crystal polymer networks (LCNs) and supported lipid bilayers (SLBs) are presented and discussed, with an emphasis on investigating stem cell behaviour.’ Yao Lu ’Hypersonic poration of membranes: from triggered release and encapsulation to drug delivery’ In this thesis hypersonic poration has been applied, to induce reversible membrane disruption in different assembled systems, such as: supported lipid bilayer (SLB), giant unilamellar vesicles (GUVs), polymer-shelled vesicles (PSVs) and cells. Marise Gielen ‘Splashing drops’ In this thesis, the focus is on substrate properties influencing the splashing behaviour of impacting drops. ‘The PhD project was a collaboration between NWO and ASML,’ says Marise Gielen. ‘In the extreme ultraviolet (EUV) source chamber, liquid tin debris impact is causing a lot of contamination. Joost Ridderbos ‘Quantum dots and superconductivity in Ge-Si nanowires’ In this thesis Germanium-Silicon (Ge-Si) core-shell nanowires are investigated, as a possible candidate for spin qubits and Majorana qubits. Quantum computers work in a fundamentally different way than classical computers do. These employ quantum mechanical bits, or qubits, as their smallest building blocks. Shantanu Mareshwari ‘Molecular dynamics simulations of nanobubbles and nanodrops’ ‘By using molecular dynamics (MD) simulations we tried to better understand, for example, why very small but stable bubbles do exist,’ says Shantanu Maheshwari. ‘Some stay stable even for days, though the pressure in these small bubbles is very large.’ Monchai Jitvisate Interfacial structure and double layer capacitance of ionic liquids’ Central to this thesis are ionic liquids: organic salts that are in liquid phase at room temperature. ‘There are many unique properties which make these liquids promising for future applications,’ says Monchai Jitvisate. Alexandr Dolgov ‘Plasma-assisted cleaning of extreme EUV optics’ In this thesis it is shown that Extreme Ultraviolet (EUV) plasma cleaning technology is feasible. ‘An EUV pulse generates a low-temperature plasma, along with photo-induced surface activation,’ Alexandr Dolgov explains. ‘These two combine, to yield a highly reactive environment that quickly and efficiently removes amorphous carbon.’ He Huang ‘Azobenzenes as energy transducers in dynamic supramolecular systems’ In this thesis the focus was on azobenzene photo-switches, as dynamic building blocks. ‘We started to study fluorinated azobenzenes,’ He Huang says. ‘Especially their application in supramolecular materials, for kinetic control and visible-light controlled switching, is very promising.’ Tatsuki Hashimoto ‘Unconventional superconductors with spin-orbit interaction’ In this thesis superconductivity and its transport properties are studied in the presence of spin-orbit interaction. Theory building, calculations and simulations, were central in this PhD research. ‘At the Interfaces & Correlated Electrons (ICE) Group, we had lots of fruitful discussions,’ says Tatsuki Hashimoto. Maryna meretska ‘Taming a white led’ In this thesis experimental and theoretical tools are defined, to connect phosphor powder properties to the colour point of white LEDs. ‘I was really surprised a systematic study didn’t already exist,’ says Maryna Meretska. ‘Despite the fast-growing market penetration, there are currently only trial and error approaches for white LED modelling.’ Xiaojue Zhu ‘Taylor-Couette (TC) and Rayleigh-Bénard (RB) turbulence: the role of the boundaries’ This thesis covers mainly the broad topic of Taylor-Couette (TC) and Rayleigh-Bénard (RB) turbulence, with wall roughness. The roughness elements vary in shape, size, sparseness, and alignment. Joline Roemers-van Beek ‘Immobilized Carbon Nanofibers; a Novel Structured Catalyst Support’ This thesis explores a novel catalyst support design. ‘The application potential served as an inspiration,’ Joline Roemers-van Beek says. ‘Carbon nanofibers on structured supports could well improve ceramic structured catalyst supports, for example monoliths in cars, and make them suitable for efficient catalyst recycling.’ Jorick van 't Oever ‘On the interaction of waves carrying light, sound and small particles’ In this thesis the use of acoustic waves, to concentrate small particles from water, is explored. This is a promising approach in novel lab-on-a-chip functionalities. ‘Two acoustophoretic forces determine particle behaviour here,’ says Jorick van ’t Oever. Wouter Vijselaar ‘Bright ways to utilize the sun: towards solar-to-fuel devices’ This thesis discusses the use of silicon as a base material for solar-to-fuel (S2F) devices. Silicon is an attractive semiconductor material, already proven itself in a wide range of applications. ‘In photovoltaic (PV) cells and in S2F, silicon can be used. However, it is not the most obvious material to choose,’ says Wouter Vijselaar. Mengdi Yang ‘Hot-wire assisted atomic layer deposition of tungsten films’ This thesis focuses on the application of hot wire atomic layer deposition (HWALD). ‘Ultra-large-scale integration of microelectronics is rapidly evolving,’ Mengdi Yang says. ‘This novel technique is promising for next generation fabrication strategies, to achieve conformal and uniform thin films, with very precise control of thicknesses on structures of increasing complexity.’ Ruonan Li ‘Molecular dynamics simulations of nanobubbles and nanodrops’ ‘Especially properly colored (PC) cycles have attracted much research attention in past decades,’ Ruonan Li says. ‘They are applied in various fields, such as social science and molecular biology. Our interest was from a theoretical point of view only.’ Sudeshna Roy ‘Hydrodynamic theory of wet particle systems’ In this thesis wet granular materials are studied. ‘They are ubiquitous in geology and in many real-world applications,’ says Sudeshna Roy. On the basis of literature research and advanced simulations, at the Multi Scale Mechanics (MSM) Group, Sudeshna aimed at better fundamental understanding a range of phenomena. Marinke van der Helm ‘Electrical and microfluidic technologies for organs-on-chips, mimicking blood-brain barrier and gut tissues’ In this thesis organs-on-chips were studied which contain micrometer-sized fluid-filled channels. ‘Herein various human cells can be cultured,’ says Marinke van der Helm. ‘Thus, a controlled environment is created that resembles the microenvironment of a certain organ. I focused on two of them: on blood-brain barrier (BBB) and on gut tissue.’ Magdalena Malankowska ‘Membrane integration in biomedical microdevices’ In this thesis the focus was on design, development and fabrication of microfluidic devices with integrated membranes. ‘In the first part of the work, a microfluidic system for blood oxygenation - a so called lung-on-a-chip - was introduced,’ says Magdalena Malankowska.