Searched for: subject:"microscopy"
(1 - 20 of 220)

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Weppelman, I.G.C. (author), Moerland, R.J. (author), Hoogenboom, J.P. (author), Kruit, P. (author)

We present a new method to create ultrashort electron pulses by integrating a photoconductive switch with an electrostatic deflector. This paper discusses the feasibility of such a system by analytical and numerical calculations. We argue that ultrafast electron pulses can be achieved for micrometer scale dimensions of the blanker, which are...

journal article 2018
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Mattoni, G. (author)
This thesis is an experimental investigation of the physical properties of different transition metal oxide ultra-thin films. A common feature of these various materials and structures is that they exhibit a solid-state phase transition from a metallic to an insulating state, which is triggered upon changing sample composition, or by varying an...
doctoral thesis 2017
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Eeftens, J.M. (author)
Every cell deals with the challenge of organising its DNA. First, the DNA needs to be compacted in size by several orders of magnitude. For example, in each human cell, 2 meters of DNA need to fit inside a micron-sized cell nucleus. Second, the DNA needs to stay accessible for cellular processes such as transcription and replication. To achieve...
doctoral thesis 2017
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Hari, S. (author)
Focussed Electron Beam Induced Processing is a high resolution direct-write nanopatterning technique. Its ability to fabricate sub-10 nm structures together with its versatility and ease of use, in that it is resist-free and implementable inside a Scanning Electron Microscope, make it attractive for a variety of applications in nanofabrication....
doctoral thesis 2017
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Lenchenkov, N. (author)
In many oil fields, water is injected into a reservoir to displace oil to the production wells. During the injection process, oil is pushed by water towards production wells which have a lower pressure than the rest of the reservoir. If the reservoir is homogeneous, then a good sweep efficiency of the water flood process is expected. However,...
doctoral thesis 2017
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Nanda, G. (author)
This thesis describes the capabilities of the helium ion microscope (HIM) and that of graphene to explore fundamental physics and novel applications. While graphene offers superior electronic properties, the helium ion microscope allows us to combine imaging and modification of materials at the nanoscale. We used the capabilities of HIM to grow...
doctoral thesis 2017
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Basak, S. (author)
With the focus in automobile industry to switch from petroleum-based vehicles to all electric vehicles, the increasing demand on harvesting energy from renewable sources for a safer and greener future and the ever-increasing demand of the portable electronics systems, the need for better batteries is eminent. The ultimate aim of battery research...
doctoral thesis 2017
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Gritti, N. (author)
doctoral thesis 2017
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Haring, M.T. (author), Liv Hamarat, N. (author), Zonnevylle, A.C. (author), Narvaez Gonzalez, A.C. (author), Voortman, L.M. (author), Kruit, P. (author), Hoogenboom, J.P. (author)
In the biological sciences, data from fluorescence and electron microscopy is correlated to allow fluorescence biomolecule identification within the cellular ultrastructure and/or ultrastructural analysis following live-cell imaging. High-accuracy (sub-100 nm) image overlay requires the addition of fiducial markers, which makes overlay accuracy...
journal article 2017
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Vicarelli, L. (author)
doctoral thesis 2017
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Palardy, G. (author), Fernandez Villegas, I. (author)

This paper presents a detailed experimental assessment of the effect of the thickness of flat energy directors (ED) on heat generation at the interface during ultrasonic welding. Power and displacement data showed clear differences caused by the change of thickness, related to heat concentration at the weld line during the process. The extent...

journal article 2017
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van Driel, B.A. (author), Wezendonk, T.A. (author), van den Berg, K. J. (author), Kooyman, P.J. (author), Gascon Sabate, J. (author), Dik, J. (author)

Titanium white (TiO2) has been widely used as a pigment in the 20th century. However, its most photocatalytic form (anatase) can cause severe degradation of the oil paint in which it is contained. UV light initiates TiO2-photocatalyzed processes in the paint film, degrading the oil binder into volatile components...

journal article 2017
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Norouzi Afshar, F. (author), Tichelaar, F.D. (author), Glenn, A. M. (author), Taheri, P. (author), Sababi, M. (author), Terryn, H.A. (author), Mol, J.M.C. (author)

This work studies the influence of the microstructure on the corrosion mechanism and susceptibility of as-brazed aluminum sheet. Various microstructures are obtained using postbrazing heat treatments developed to enhance the corrosion resistance of an AA4xxx/AA3xxx brazing sheet. The heat treatment results in a decrease of the matrix Si...

journal article 2017
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Ghodrat, S. (author), Riemslag, A.C. (author), Kestens, L.A.I. (author)
Orientation contrast microscopy (i.e., electron backscattered diffraction, EBSD) was employed to monitor the plastic strain in loaded tensile samples of aluminium alloy Al6061 in T4 condition. The kernel average misorientation (KAM) is known to be an appropriate parameter in orientation contrast microscopy which has the potential to characterise...
journal article 2017
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Gonnissen, J (author), De Backer, A (author), den Dekker, A.J. (author), Sijbers, J. (author), Van Aert, S (author)

In this work, a recently developed quantitative approach based on the principles of detection theory is used in order to determine the possibilities and limitations of High Resolution Scanning Transmission Electron Microscopy (HR STEM) and HR TEM for atom-counting. So far, HR STEM has been shown to be an appropriate imaging mode to count the...

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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Ren, Y. (author), Kruit, P. (author)

Our group is developing a multibeam scanning electron microscope (SEM) with 196 beams in order to increase the throughput of SEM. Three imaging systems using, respectively, transmission electron detection, secondary electron detection, and backscatter electron detection are designed in order to make it as versatile as a single beam SEM. This...

journal article 2016
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Ushakova, K. (author)
doctoral thesis 2016
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Puspitasari, I. (author)
The objectives of this PhD project are to address the challenges of in-situ TEM and introduce a new generation of in-situ TEM equipment. In Chapter 2 the in-situ TEM facilities are introduced, focusing on the nanoreactor that has gone through quite some development stages during this project. Several types of in-situ TEM nanoreactors were...
doctoral thesis 2016
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Tiruvadi Krishnan, S (author)
All living organisms pass on their genetic information to their offspring in the form of DNA or RNA molecules by duplicating them across generations. In the bacteria, their genes are packed in long chains of DNA molecules or chromosomes. One of the widely studied model organisms, Escherichia coli, replicates its circular chromosome in two...
doctoral thesis 2016
Searched for: subject:"microscopy"
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