Joining different material types, like metal and thermoplastic fiber reinforced polymer composites (TP-FRPC), offers a large potential for innovative light weight applications. This kind of bonding depends on mechanical, physical, chemical interactions is, therefore influenced by joining partner surface treatments. study describes adhesion models the effect treatments AlMg3-CF/PA66-joints. means induction heating is an appropriate technology metal/TP-FRPC as it utilized rapid heat...

Abstract Up to now, no consensus exists about the electronic nature of phosphorus (P) as donor for SiO 2 -embedded silicon nanocrystals (SiNCs). Here, we report on hybrid density functional theory (h-DFT) calculations P in SiNC/SiO system matching our experimental findings. Relevant configurations within SiNCs, at SiNC surfaces, sub-oxide interface shell and matrix were evaluated. Atom probe tomography (APT) its statistical evaluation provide detailed spatial distributions. For first time,...

Silicon nanocrystals (SiNCs) embedded in a silicon oxide matrix were studied by 3D atom probe tomography (APT). The distribution of the SiNC diameter was found to have mean value 3.7 ± 0.8 nm. elemental composition these particles determined employing two different approaches: (i) proximity histogram method and (ii) cluster identification algorithm based on maximum-atom separations. Both approaches give very similar values terms amount P, O, Si within SiNCs: atomic concentrations are cP =...

Static contact angle measurements are one of the most popular methods to analyze wetting behavior materials any kind. Although this method is readily applicable without need sophisticated machinery, results obtained for very same material may vary strongly. The sensitivity measurement against environmental conditions, sample preparation and conduction a main factor inconsistent results. Since often no detailed protocols exist alongside published data, values as well elaborated studies do not...

The unfolding of a sheared mechanically mixed third-body (TB) in tungsten/tungsten carbide sliding systems is studied using combination experiments and simulations. Experimentally, the topographical evolution friction response, for both dry lubricated sliding, are investigated an online tribometer. Ex situ X-ray photoelectron spectroscopy, transmission electron microscopy, cross-sectional focused ion beam analysis structural chemical changes near surfaces show that tungsten against results...

We study the electronic properties of phosphorus doped Si nanocrystal/SiO2 superlattices and determine carrier concentration by transient current analysis. This is achieved encapsulating multilayers between two electrical insulation layers controlling mobility a defined layer to separation. A saturation voltage dependent ionized density observed which indicates complete substitutional dopant ionization allows calculate induced charge density. It found that doping efficiency superlattice only...

It is well known, that high-strength steels do not show a classical fatigue limit and failure occurs still after 107 cycles. The reason for this late the properties in long life region are strongly affected by non-metallic inclusions inside material (Murakami et al. (1989)). After VHCF characteristic fine granular area, or short FGA, can be observed at fracture surface. FGA formation responsible initiation of propagable crack (Grad (2012); Sakai (2002)). In recent years lot research was...

Micro machining processes are characterized by the influence of size effects like workpiece micro structure on process and ultimately results. So far, grain orientation results is state art mostly investigated single-crystal materials, but in polycrystalline materials with a hexagonal close packed (hcp) crystal commercially pure (cp)-titanium is, to best knowledge authors, not completely understood. Within this research, correlation between surface topography, forces, chip formation...

Abstract Boron (B) doping of silicon nanocrystals requires the incorporation a B-atom on lattice site quantum dot and its ionization at room temperature. In case successful B-doping majority carriers (holes) should quench photoluminescence Si via non-radiative Auger recombination. addition, holes allow for non-transient electrical current. However, bottom end nanoscale, both substitutional are subject to significant increase in their respective energies due confinement size effects....

In order to achieve a more specific knowledge about the bonding mechanism of ultrasonically welded Al/CFRP‐joints, microscopic investigations were carried out. Transmission electron microscopy was used investigate interface between aluminum and CFRP sheet. One important result detection mechanically deformed areas due ultrasonic welding which lead reorientation crystal structure in surface near pre‐treated aluminum. Furthermore it has been proven, that molten thermoplastic can penetrate into...

This study investigates the tribolayer properties at interface of ceramic/metal (i.e., WC/W) sliding contacts using various experimental approaches and classical atomistic simulations. Experimentally, nanoindentation micropillar compression tests, as well adhesion mapping by means atomic force microscopy, are used to evaluate strength tungsten-carbon tribolayers. To capture influence environmental conditions, a detailed chemical structural analysis is performed on worn surfaces XPS depth...

Atom probe tomography studies on highly Mg-doped homoepitaxial GaN (0001) layers with concentrations of 5 × 10(19) cm(-3) and 1 10(20) were performed. Mg cluster formation was observed only in the higher doped sample whereas lower distribution homogeneous. CL measurements have shown that emission normally attributed to stacking faults present (with concentration ∼5 or less), but absent layer, where clusters detected. are proposed produce a screening effect, thereby destroying exciton binding...

At high-strength steels very high cycle fatigue (VHCF) failure always occurs at subsurface inclusions. As a result, the shows large scatter and is not observable or predictable prior to failure. In order understand mechanisms leading crack initiation in VHCF, it necessary make observable. Within our work, new testing procedure introduced that enables simulation of conditions surface thereby localisation Therefore, specimens with artificial defects were tested vacuum atmosphere. we will show...

To understand the complex interplay of topography and surface chemistry in wetting, fundamental studies investigating both parameters are needed. Due to sensitivity wetting miniscule changes one it is imperative precisely control experimental approach. A profound understanding their influence on facilitates a tailored design surfaces with unique functionality. We present multi-step study: The analyzed by determining adsorption volatile carbonous species (A) sputter deposition metallic copper...

The quantitative determination of chemical solid phases by secondary neutral mass spectrometry (SNMS) based on the character this technique is described and demonstrated for several thin film structures. intermetallic in a Ni–Zn coating Fe are shown to be achieved directly from concentration ratios determined SNMS. When correlating local elemental tupels with corresponding phase fractions matrix equation, depth profiles becomes possible. This exemplified detection temperature induced Ni...

Abstract Two model proteins, bovine serum albumin (BSA) and lysozyme (LSZ), were used to study adsorption behavior on dental titanium by time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS). Protein films prepared as single component layers mixtures of the two proteins. Additionally, consecutive both proteins was investigated. The obtained data analyzed means principal analysis (PCA). Dental samples with a layer consisting simply one protein could be separated from each other selecting...