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Publications (32)
Plasma in hydrogen-containing atmospheres is an efficient method for the reduction of iron oxides. Although a vast number of approaches were performed for the reduction of bulk Fe oxides with thermal hydrogen plasmas, there is almost no information about the non-thermal plasma reduction efficiency in the atmospheric pressure range. In the current a...
The front cover artwork is provided by Prof. Maus-Friedrichs' group at the Clausthal University of Technology. The image shows the molecular interaction formed at the interface between the adhesive cyanoacrylate and a natively oxidized copper or aluminium surface. Read the full text of the Research Article at 10.1002/cphc.202300076.
As oxygen negatively affects most production processes in the metalworking industry, a truly oxygen‐free production environment appears attractive in terms of the resulting material and component properties. This overview summarizes research conducted within the Collaborative Research Centre (CRC) 1368. The objectives of this CRC are twofold. First...
Cyanoacrylates are an extremely reactive class of adhesives. Despite their commercial use as instant adhesives, the adhesion mechanism, especially to technically relevant oxidized metal surfaces, has not yet been sufficiently investigated. In the present work, ultra‐thin ethyl cyanoacrylate films are deposited on copper oxide and aluminum oxide by...
Nowadays, cold plasma techniques like dielectric barrier discharge (DBD) plasmas have attracted considerable interest in view of high deoxidation efficiencies as well as relative simplicity of setups. Although DBD plasma deoxidation of copper has been mainly studied in Ar/H2 mixtures, there is no information on reduction performance of such methods...
Oxide layers on metal surfaces adversely affect processability and material properties in many industrial applications. Although several plasma-based approaches for deoxidation were investigated in the past, oftentimes they either work under conditions expensive to create or require long processing times. In this study, the deoxidation effect of a...
Metastable Induced Electron Spectroscopy, Ultraviolet Photoelectron Spectroscopy (He I and He II), X-ray Photoelectron Spectroscopy, and Atomic Force Microscopy were employed to study the interaction of silver with lignin as well as with two of its natural precursors, coniferyl alcohol and sinapyl alcohol. For all three of them, no chemical interac...
For understanding the interactions between adhesives and different surfaces, the in-situ characterization of the interface is essential. Especially for highly reactive cyanoacrylates, better known as super glues, the adhesion mechanism is poorly understood because, among other things, the characterization of the interface is difficult. The aim of t...
A process of removal of surface oxides from stainless steels AISI 304 and 446 that involves reduction by residual carbon, followed by formation and desorption of carbon monoxide, is studied by investigation of thermal desorption (with QMS) and SIMS. Carbon monoxide desorption is studied as a function of time and temperature by QMS, carbon diffusion...
In the plastic-processing industry, the formation of unknown deposits at the interface between polymer melt and steel surfaces can pose major challenges, which occurs especially on screws, barrels, and tools. These deposits will detach during production and lead to quality restrictions mostly as spots in the products. We investigated the interactio...
The adsorption behavior of thin films of terephthalic acid (TPA) evaporated on a gold surface as well as on an aluminum foil was studied. The orientation of the molecules was characterized by metastable induced electron spectroscopy (MIES) and ultraviolet photoelectron spectroscopy (UPS). To make sure that the evaporation of TPA is nondestructive,...
The deposition behavior of bisphenol A polycarbonate (BPA-PC) on a Au(111) single crystal has been studied. Thin films of PC were prepared by in situ evaporation of PC pellets under UHV conditions. The resulting PC/Au(111) interfaces were characterized by means of Ultraviolet Photoelectron Spectroscopy (UPS), X-ray Photoelectron Spectroscopy (XPS)...
We have employed Metastable Induced Electron Spectroscopy, Ultraviolet Photoelectron Spectroscopy, X-ray Photoelectron Spectroscopy and Atomic Force Microscopy to investigate the adsorption behavior of silver on Ar plasma treated pine wood chips. The plasma treatment of wood surfaces in argon leads to a hydrophobization of the surfaces by the detac...
Self-assembling systems of colloidal spheres are widely used as templates for the structured deposition of metals and semiconductors. Multilayer samples of ordered polystyrene spheres are prepared by a flow induced process. The subsequent surface activation by a dielectric barrier discharge in oxygen is followed by the fabrication of protecting pol...
In the present paper, the decomposition and the crystallization behaviour of amorphous Si2C films, which were deposited by r.f. magnetron co-sputtering on Si wafer substrates, are investigated. For analysis, the following methods were used: x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), grazing incidence x-ray diffr...
The coating of titanium dioxide nanoparticles with silicon dioxide has been carried out by dielectric barrier discharge (DBD) plasma treatments to enhance the ther-mostability of Titania for applications at high temperature processes. During the first coating processing step, a closed film of silicon nitride was produced via plasma treatment in a g...
The fatigue corrosion cracking of the Al7075 alloy has been investigated by Scanning Electron Microscopy (SEM) and Auger Electron Spectroscopy (AES). Specimen exposed to cyclic load at room temperature until crack initiation show a significant increase of magnesium within a distance of about 1 μm around the crack, while almost no aluminum was left....
The adsorption of silver on lignin is of great interest for the modification of wood surfaces with antibacterial coatings. The natural precursors during the biosynthesis of lignin are mainly the monolignols sinapyl alcohol and coniferyl alcohol. These have been used as model systems to get a better understanding of the interaction of silver with li...
Titanium dioxide nanoparticles are used commonly in various applications due to their high catalytic activity. Many of these applications require subsequent treatments after the deposition of the TiO2 particles. Some of these include thermal processing at high temperatures, e.g. roof tiles. For all of these applications, the crystal structures as w...
Multilayer polystyrene (PS) colloid crystals are exposed to a dielectric barrier discharge (DBD) in a mixture of nitrogen and silane as processing gas. This yields a closed layer of silicon nitride on the PS spheres. In a second step silicon nitride is oxidised to SiO 2 in an oxygen-DBD. Finally PS is pyrolytic decomposed leaving a colloid crystal...
Deformable sandwich sheet materials have the advantage to be produced as raw materials and to be formed afterwards to even complex geometries. Moreover they are cost effective and predestinated for mass production. For such systems the necessity is given for a good bonding to guarantee a good shear transfer between the single layers. Because of def...
Titanium dioxide nano particles are used commonly in various applications due to their high catalytic activity. Many of these applications require
subsequent treatments after the deposition of the TiO2 particles. Some of these include thermal processing at high temperatures, e.g. roof tiles. During such procedures the nano particles transform from...
The adsorption of silver on different organic substrates is of great technological interest for various applications. Over the past 20 years, especially silver nano particle coatings drastically increased in importance, due to their outstanding functionality. One of the most common applications of silver particles is the functionalization of surfac...
The thermal stability of amorphous Si2C films was studied by means of X-ray Photoelectron Spectroscopy (XPS), Auger Electron Spectroscopy (AES), Grazing Incidence X-ray Diffractometry (GIXRD), Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The films were deposited by magnetron sputtering onto silicon single crystals. The as-d...
Polystyrene nanospheres are currently under investigation as litography masks and templates for the production of hollow inorganic spheres which have promising applications in catalysis and energy storage. In this regard the chemical functionalization and stabilization of the polystyrene framework is crucial.
Thin films of ordered polystyrene nano...
Metastable Induced Electron Spectroscopy, Ultraviolet Photoelectron Spectroscopy, X-ray Photoelectron Spectroscopy, and Atomic Force Microscopy have been employed to study the adsorption of silver and cinnamyl alcohol on Au(111) and Si(100) substrates. Initially, these investigations were carried out preceding the investigation of the adsorbtion be...
Metastable induced electron spectroscopy, ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy are employed to study the adsorption of silver on cinnamyl alcohol films prepared on Au(111) substrates by thermal evaporation. Additionally, the impact of an Ar atmosphere dielectric barrier discharge plas...
The radical oxidation of Ge(100) applying a dielectric barrier discharge plasma was investigated using metastable induced electron spectroscopy, ultraviolet photoelectron spectroscopy, and x-ray photoelectron spectroscopy. The plasma treatments were performed in a pure oxygen atmosphere as well as under environmental conditions at room temperature....
Cleaning and passivation of Germanium surfaces is of tremendous technological interest. Germanium has various applications, for example in complementary metal-oxide-semiconductor elements. It turned out to be difficult to prepare contamination free Germanium surfaces by methods of wet chemistry. Several attempts have been made preparing such surfac...
