In situ spectroscopic and corrosion studies of ultra-thin gradient plasma polymer layers on zinc

Grundmeier, Guido; Brettmann, Matthias; Thiemann, Petra

doi:10.1016/s0169-4332(03)00548-8

Cited by 20 publications

(9 citation statements)

References 15 publications

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“…The mechanical properties of the polymer matrix depend on the molecular weight, 11 and the coupling between the matrix and the piezoelectric nanowire surface could be modified using adhesion promoters such as hexamethyldisilazane (HMDS). 12 The results show that the generated outputs of the devices are directly related to the stiffness of the polymer matrix and the adhesion strength between the piezoelectric surface and matrix materials, which agreed well with the simulations.…”

supporting

confidence: 81%

Enhanced output of nanostructured piezoelectric arrays via controlled matrix/transducer interfacial interactions

Kim

Sirbuly

2012

Applied Physics Letters

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Here we investigate the effects of interfacial interactions and the mechanical properties of the matrix on the piezoelectric output of vertically aligned ZnO nanowires (NWs) embedded in a polymer matrix. This matrix-assisted energy conversion platform allows non-mechanical energy sources to apply stress to the NWs, producing direct-current outputs. The slip conditions at the matrix/transducer interface were experimentally modified using adhesion promoters and different molecular weight matrices which were compared to finite element method simulations. The no-slip conditions showed a 2-fold enhancement in the output whereas a 72% increase in the matrix modulus resulted in a 2.5-fold enhancement.

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supporting

confidence: 81%

Enhanced output of nanostructured piezoelectric arrays via controlled matrix/transducer interfacial interactions

Kim

Sirbuly

2012

Applied Physics Letters

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“…[31] Similar investigations using plasma polymerisation were carried out concerning the deposition of cyclohexene/hexamethyldisilane on a zinc oxide surface. [32] The objective of the experiments performed in [32] was to produce a graded interfacial layer where one side promotes a strong bond between the polymer and the metal while the other side possesses optimum properties for the attachment of a polymer (organic coating). A final surface treatment in an Oxygen plasma further allows introducing polar groups into the outer polyethylene-like layer.…”

Section: Methodsmentioning

confidence: 99%

“…A final surface treatment in an Oxygen plasma further allows introducing polar groups into the outer polyethylene-like layer. [32] The metal has now a good surface condition for the subsequent processing of a metal/polymercomposite. Figure 7 illustrates functional interfaces for the improvement of the adhesion of a polymer on a metal surface.…”

Section: Methodsmentioning

confidence: 99%

Polymer/NiTi‐composites: Fundamental Aspects, Processing and Properties

et al. 2005

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have occurred as a result of a stress-induced displacive transformation. It was also demonstrated that this can only occur in nanocrystalline material, and the atomistic and thermodynamic aspects of the transformation were briefly considered. Finally, it may be noted that this displacive transformation process represents a new deformation mode that can be activated when alternative deformation mechanisms such as slip of lattice dislocations have become exhausted and the applied shear stress exceeds the local yield stress of the nanocrystalline state for this specific process. ExperimentalA carbon steel with a typical yield stress of 0.88 GPa containing approximately 0.8 wt. % C and 1.3 wt. % Mn with a well-defined pearlitic microstructure of alternating lamellae of bcc-Fe (ferrite) and Fe 3 C (cementite) in each grain was transformed into a fully nanocrystalline structure by High Pressure Torsion (HPT): disc-shaped samples with a diameter ranging from 10 ± 20 mm and a thickness of 0.2 ± 0.5 mm are placed between two anvils and subjected to 7 GPa pressure. The lower anvil is then rotated slowly (approx 1 rpm = 0.017 Hz) and frictional forces result in the shear straining of the sample as illustrated in Figure 1(a,b): this results in very high shear strains at relatively low strain rates. As our previous investigations showed, [16] the process of nanostructuring involves a sequence of stages such as the formation of cells and cell blocs, the increase of misorientations between cells, and finally formation of the nanostructure in the form of statistically oriented mosaic-nanocrystals. The microstructure of the specimens was characterised by transmission electron microscopy using both conventional bright-field and high-resolution transmission electron microscopy (HRTEM) imaging together with selected area diffraction using a FEI Tecnai F20 ST operated at 200 kV and an extraction voltage of 4.1 keV for the field emission gun (at FZ Karlsruhe) together with selected area diffraction using a FEI Tecnai T20 ST operated at 200 kV equipped with a Gatan Imaging Filter (at the University of Glasgow). The crystallography of crystallites and the interfaces between them was determined from fast Fourier transforms (FFTs) of different areas of the HRTEM images using the software package Digital Micrograph (Gatan Inc.).In the present study we present applied and basic work on composites which combine shape memory alloys and polymeric materials. This type of composites has received increasing attention in the last decade. The scientific literature data COMMUNICATIONS

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“…In this case, a proper surface pretreatment is expected to permanently change the oxide surface chemistry as well as morphology and/or roughness. A change of surface chemistry is expected to adjust the surface electronic and semiconductor properties as a result of variation of doping concentration type and/or density as well as charge carriers [15][16][17]. In this study, model pretreatments are defined to thoroughly control surface properties.…”

Section: Surface Oxide Propertiesmentioning

confidence: 99%

“…There are several aspects determining the oxygen reduction at the interface area. Among them, surface semiconductor and electrical properties play an important role in oxygen reduction and consequently cathodic delamination of polymer coatings from metal surfaces [15][16][17][28][29][30]. Metal surface chemical modification is a method to reduce the oxygen reduction rate at the interface area to retard cathodic delamination as a result of the oxide electronic variations [31].…”

Section: Surface Oxide Semiconductor Propertiesmentioning

confidence: 99%