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interface:index [2019-02-05 16:49]
Dominik Dworschak
interface:index [2019-08-14 11:39] (current)
Dominik Dworschak
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** Group of Prof. Markus Valtiner ** ** Group of Prof. Markus Valtiner **
-{{ :interface:group_pic_october18.pdf.jpg?350|}}+{{ :interface:june2019grouppic.jpg?370|}}
Our research focuses on the broad areas of adhesion, friction as well as interfacial forces and their utilization for making better energy-saving, energy efficient, cheaper, long lasting smart materials for application in structural and functional materials. We are also interested in dynamic interaction forces, single molecular interactions and soft matter physics in confined spaces. Our aim is to gain insight into the fundamental interactions in complex interfacial processes, and to translate fundamental science into knowledge-based design of better and novel structural and functional materials for technological applications. We are in particular interested in: Our research focuses on the broad areas of adhesion, friction as well as interfacial forces and their utilization for making better energy-saving, energy efficient, cheaper, long lasting smart materials for application in structural and functional materials. We are also interested in dynamic interaction forces, single molecular interactions and soft matter physics in confined spaces. Our aim is to gain insight into the fundamental interactions in complex interfacial processes, and to translate fundamental science into knowledge-based design of better and novel structural and functional materials for technological applications. We are in particular interested in:
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  * Corrosion and reactivity in confined spaces (crevice corrosion, SCC)   * Corrosion and reactivity in confined spaces (crevice corrosion, SCC)
  * Structuring of ionic liquids and solutions of ionic liquids at charged and uncharged interfaces   * Structuring of ionic liquids and solutions of ionic liquids at charged and uncharged interfaces
 +
 +====== Recent work ======
 +
 +
 +
 +===== FEATURED: Optimizing multiple beam interferometry in the surface forces apparatus: Novel optics, reflection mode modeling, metal layer thicknesses, birefringence, and rotation of anisotropic layers (open access article) =====
 +{{:interface:rsi.2019.90.issue-4.largecover.jpg?150 |Cover RSI}}
 +Multiple beam interferometry (MBI) evolved as a powerful tool for the simultaneous evaluation of thin film thicknesses and refractive indices in Surface Forces Apparatus (SFA) measurements. However, analysis has relied on simplifications for providing fast or simplified analysis of recorded interference spectra. Here, we describe the implementation of new optics and a generalized fitting approach to 4 × 4 transfer matrix method simulations for the SFA. The newly developed optical layout for SFA, which greatly simplifies operation, introduces reference beams, allows recording of reflection and transmission mode spectra, and minimizes potential systematic errors in experiments and analysis. This approach greatly simplifies SFA experimentation and analysis and opens SFA for new and exciting opportunities, including metamaterials, multilayered anisotropic layers, layers of rotating anisotropic layer, as well as chiral layers. FREE DOWNLOAD from [[https://aip.scitation.org/doi/10.1063/1.5085210|Rev. Sci. Instr.]].
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 +<clear>
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 +
 +===== In situ nano- to microscopic imaging and growth mechanism of electrochemical dissolution (e.g., corrosion) of a confined metal surface =====
 +{{:interface:aip_pub_01.png?150 |Crevice corrosion}}
 +Reactivity in confinement is central to a wide range of applications and systems, yet it is notoriously difficult to probe reactions in confined spaces in real time. Using a modified electrochemical surface forces apparatus (EC-SFA) on confined metallic surfaces, we observe in situ nano- to microscale dissolution and pit formation in well-defined geometries in environments relevant to corrosion processes. Read more in [[http://www.pnas.org/content/114/36/9541|PNAS]].
 +\\
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 +<clear>
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 +
 +===== One molecule at the time: Probing surface-to-molecule bonds - Bias and work dissipation (Open access article) =====
 +{{:interface:aip_rw_fig2.png?150 |Workfluctuations and free energy estimator convergence}}
 +The capabilities of Atomic Force Microscopes and Optical Tweezers to probe unfolding or surface-to-molecule bond rupture at a single-molecular level are widely appreciated. Our recent results provide new insights into stability and work dissipation mechanisms at adhesive interfaces at the single-molecular level, and offer important design and analysis aspects for single-molecular surface-to-molecule experiments. Want to know more? Read our article (OPEN ACCESS) in this [[http://pubs.acs.org/doi/10.1021/acs.langmuir.7b02844|Langmuir]] special issue.
 +<clear>
 +\\
 +\\
====== Group news ====== ====== Group news ======
 +==== Shiny basement with Ben ====
 +{{:interface:ben_joining.jpg?100 |}}
 +We are happy to welcome Ben Stephani to our group. In his bachelor thesis he is working on finishing our Physical Vapor Deposition (PVD) together with Dr. William Cheng. This machine is essential for many of our experiments since it makes us possible to create thin and flat metal films, a good model system for surfaces in general.
 +Welcome Ben!
 +
 +
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 +----
 +
 +==== Exploring landscapes with Alexander ====
 +{{:interface:alex_joining.png?100 |}}
 +With Alexander Imre we have a new project student. Supervised by Ulrich Ramach and Julia Appenroth Alex does electrochemical studies on L-DOPA to widen our insights into the molecules energy landscape.
 +This is expanding the work that has been started with Laila Moreno Ostertag. Nice to have you, Alex!
 +
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 +----
 +
 +==== Holiday season?! ====
 +{{:interface:crowdedlab.jpg?200 |}}
 +Even now seems to be a perfect time of the year to go on holiday our lab is crowded as never before. So temperatures are rising not just outside, but also in our lab.
 +Happy holiday season!
 +\\
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 +\\
 +----
 +
 +==== New bachelor student Milena ====
 +{{:interface:milena_joining.jpg?100 |}}
 +Milena Zehetner joins our bio-related subgroup as a bachelor student. She studies the properties of glue obtained from ticks. This is a promising material for bio-compatible applications for example in surgery. Nice to have you here, Milena!
 +\\
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 +----
 +
 +==== Martin starting ====
 +{{:interface:martin_joining.png?100 |}}
 +With Martin Wess joining we enlarge our corrosion team. In cooperation with [[https://www.berndorfband-group.com/en/| Berndorf Band]] and supported by the [[https://www.ffg.at/en| FFG]] he works on material degradation of stainless steels. Welcome Martin!
 +\\
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 +----
 +
 +==== Joanna Joining ====
 +{{:interface:joanna_joining.jpg?100 |}} We are happy to welcome our new Postdoc, Joanna Dziadkowiec. She will work on electrochemical corrosion, growth and friction of confined, reactive mineral surfaces. Her project is in collaboration with the [[https://www.mn.uio.no/njord/english/| Njord Centre]] at the University of Oslo, funded by the [[https://www.forskningsradet.no/en/|Research Council of Norway]] (FRINATEK Mobility). Nice to have you here!
 +\\
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 +----
 +
 +==== 'Current event' ====
 +{{:interface:currentbachelorettes.jpg?120 |}} Our electrochemistry department got new members: With Sonja Scherhaufer and Valentina Wieser we welcome our first Bachelor students.
 +Valentina will work on the electrochemical version of our Surface Force Apparatus (SFA) under the supervision of William. Sonja does electrochemical characterization of dopamine and other catechol derivates, supported by Laila. Welcome!
 +\\
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 +----
 +
 +==== PhD students +1, Austrians +1 ====
 +{{:interface:uliramach.jpg?90 |}} With Ulrich Ramach joining we widen our research more to the bio direction. In his PhD Uli wants to gain insights into ion channels and proteins for biosensing. His work is done in collaboration with [[https://cest.at/|CEST]].
 +Welcome Uli!
 +\\
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 +
 +----
 +
 +==== New faces in the group ====
 +{{:interface:flo.jpg?90 |}}{{:interface:adelr.jpg?90 |}} We are happy to welcome two new persons among us. Florian Feldmann is doing his PhD with both us and the company [[https://www.doerken-mks.de/en/|Dörken MKS]]. He will characterize corrosion protection coatings based on zinc lamellae. Adél Racz is doing her PhD at the [[https://www.energia.mta.hu/en|Hungarian Academy of Sciences Centre for Energy Research]] and doing a scholarship with the [[https://oead.at/en/|OeAD]]. She brought Carbides produced by radiation to characterize their tribologic properties. \\
 +Welcome Flo and Adél!
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 +----
 +
 +==== Carnival 2019 ====
 +{{:interface:carneval.jpg?200 |}} According to an order by the institute director we dressed up for Carneval today. Since some parts of our group used to live in Düsseldorf in the past (which is one on Germany's hotspots in this matter) it was easy for us to comply with that rule. Krapfen complemented the atmosphere.
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 +----
 +
 +==== Group Retreat in Slovakia ====
 +{{:interface:group_retreat_bratislava_2019.jpg?220 |}}5th floor of Freihaus is less crowded these days since we are on our group retreat in the rural part of Bratislava, Slovakia. Apart from rich discussions about our current and future research we also enjoy the time together on walks and sports. Thanks to Laura, who took over the organisation of our trip!
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 +
 +----
 +
==== Group is getting more austrian ==== ==== Group is getting more austrian ====
{{:interface:julia_joining.jpg?80 |}} We are happy to welcome our new group member Julia Appenroth. She is working on single-molecule adhesion and on scaling it up to peptide-based mussel glue mimics. She will collaborate with our colleagues at both [[https://cest.at/|CEST]] and [[https://www.jku.at/|JKU Linz]]. Welcome to our group! {{:interface:julia_joining.jpg?80 |}} We are happy to welcome our new group member Julia Appenroth. She is working on single-molecule adhesion and on scaling it up to peptide-based mussel glue mimics. She will collaborate with our colleagues at both [[https://cest.at/|CEST]] and [[https://www.jku.at/|JKU Linz]]. Welcome to our group!
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-====== Recent work ====== 
-{{:interface:aip_pub_01.png?150 |Crevice corrosion}} 
- ===== In situ nano- to microscopic imaging and growth mechanism of electrochemical dissolution (e.g., corrosion) of a confined metal surface ===== 
-Reactivity in confinement is central to a wide range of applications and systems, yet it is notoriously difficult to probe reactions in confined spaces in real time. Using a modified electrochemical surface forces apparatus (EC-SFA) on confined metallic surfaces, we observe in situ nano- to microscale dissolution and pit formation in well-defined geometries in environments relevant to corrosion processes. Read more in [[http://www.pnas.org/content/114/36/9541|PNAS]]. 
-\\  
-\\  
- 
- 
- 
-{{:interface:aip_rw_fig2.png?150 |Workfluctuations and free energy estimator convergence}} 
-===== One molecule at the time: Probing surface-to-molecule bonds - Bias and work dissipation ===== 
-The capabilities of Atomic Force Microscopes and Optical Tweezers to probe unfolding or surface-to-molecule bond rupture at a single-molecular level are widely appreciated. Our recent results provide new insights into stability and work dissipation mechanisms at adhesive interfaces at the single-molecular level, and offer important design and analysis aspects for single-molecular surface-to-molecule experiments. Want to know more? Read our article in this [[http://pubs.acs.org/doi/10.1021/acs.langmuir.7b02844|Langmuir]] special issue. 
interface/index.1549381786.txt.gz · Last modified: 2019-02-05 16:49 by Dominik Dworschak