Materials Literature
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This work details the design and simulation of an inconspicuous photonic paint that can be applied onto an object for anticounterfeit and tag, track, and locate (TTL) applications. The paint consists of three-dimensional metallic tilted woodpile photonic crystals embedded into a visible and infrared transparent polyme…
It has been known for some time that biological sections shrink in the transmission electron microscope from exposure to the electron beam. This phenomenon is especially important in Electron Tomography (ET). The effect on shrinkage of parameters such as embedding medium or sample type is less well understood. In addi…
Abstract High-resolution transmission electron microscopy (HRTEM) is applied to thin crystalline films of (Gd1−x Lu x )2O3 and (La1−x Lu x )2O3 on Si(1 1 1). Electron micrographs confirm that an atomically smooth and chemically abrupt interface of epitaxially grown rare-earth thin films is feasible. This work demonstr…
A physical model for the frequency-dependent dielectric response of multilayered structures is reported. Two frequency regimes defined by the relative permittivities and volume resistivities of the layers have been analytically identified and experimentally investigated on a structure consisting of polyimide and poly(…
The phase, microstructure and microwave dielectric properties of SrLa 4 Ti 5−x Sn x O 17 (0≤x≤3) were investigated in an attempt to tune their temperature co-efficient of resonant frequency (τ f ) to zero. The compositions sintered to single phase SrLa 4 Ti 5 O 17 ceramics at x = 0, and SrLa 4 Ti 4−x Sn x O 17 along w…
The heteroepitaxy of semipolar s-plane (11¯01) InN grown directly on r-plane sapphire by plasma-assisted molecular beam epitaxy is studied using transmission electron microscopy techniques. The epitaxial relationship is determined to be (11¯01)InN ∥ (11¯02)Al2O3, [1¯1¯20]InN ∥ [202¯1¯]Al2O3, [11¯02¯]InN ∼∥ [022¯1]Al2O…
We report the synthesis of cobalt nanoparticles of a range of sizes from raw cobalt fluoride powder using high intensity focused electron beams and their characterisation in-situ in a TEM. A variety of beam intensities with different focussing level in a JEOL JEM 3010 TEM at an acceleration voltage of 300 kV is used.…
A new soluble polyamine with main chain perylene units is synthesized and subsequently converted into cationic or zwitterionic polyelectrolytes. The optical properties of the monomer 1,6,7,12-tetrakis(4-tert-butylphenoxy)-3,4,9,10-tetra(bromomethyl)perylene and the resulting polymers have been studied with special att…
Orchestrated structure evolution is an alternative nanomanufacturing approach that combines the advantages of top-down patterning and bottom-up self-organizing growth. It relies upon tool-directed patterning to create 'seed' locations on a surface from which a subsequent deposition process produces the final, merged f…
This work was performed in the frame of the european project INFUCOMP. This paper focuses on the development of a viscosity model for the epoxy systems Hexcel RTM6 and Cycom 890RTM, and the associated experimental data sets. A new modelling approach was developed based on the use of reference viscosity as a state vari…
The recent availability of aberration corrected analytical electron microscopes (ACAEM) is revolutionizing our ability to characterize nanostructured catalyst materials. Some recent case studies are presented whereby the application of the high angle annular dark field (HAADF) imaging technique, coupled with STEM-XEDS…
Quantitative chemical information from semiconductor nanostructures is of primary importance, in particular at interfaces. Using a combination of analytical transmission electron microscopy techniques, we are able to quantify the interfacial intermixing and surface segregation across the intricate non-common-atom wett…
The performance of a new 300kV scanning transmission electron microscope (STEM) equipped with cold field-emission gun (c-FEG) is characterised with respect to the stability for and the energy width in electron energy-loss spectroscopy (EELS) and the probe size and beam current obtainable for convergent beam and scanni…
Matrix metalloproteases are key regulatory molecules in the breakdown of extracellular matrix and in inflammatory processes. Matrix metalloproteinase-1 (MMP-1) can significantly enhance muscle regeneration by promoting the formation of myofibers and degenerating the fibrous tissue. Herein, we prepared novel MMP-1-load…
Aberration corrected HRTEM has been successfully applied to image the atomic motion at the edges and surfaces of nanoparticles of ceria of various types under electron irradiation. Here we identify movements not only on {100} facets, but also on {110} and even {111} facets, previously considered stable. However, the d…
We present a morphology study of ZnO tetrapods using aberration corrected TEM, HAADF-STEM and 3D HAADF-STEM cryotomography as an alternative to more conventional TEM and SEM techniques. We use 3D IMOD reconstructions to show that the {1 0} facets dominate the total surface area of uniform hexagonal prism tetrapods. Us…
Glue-laminated (glulam) bamboo potentially used to be a substitute for wood as a building material, because it can be produced within four to five years of planting. Mechanical properties of glulam bamboo should be well understood by support the wider application of this new material in structural components. This stu…
Electrospun materials have been proposed for application for gas filtration, drug carriers, and tissue engineering. The surface morphology of electrospun fibers is the key for consideration for the above applications, such as pore size on the fiber surface, surface area, and roughness. In this work, we investigated th…
This paper presents a field-effect transistor with a channel consisting of a two-dimensional electron gas located at the interface between an ultrathin metallic film of Ni and a p-type Si(111) substrate. The gate length is L = 2 μm, its width is W = 180 μm, and the source-drain separation is 188 μm, the role of the ga…
Dielectric property of epitaxial SrBi4Ti4O15 thin films with (001)-, (1110)-, (105)/(015)-, and (100)/(010)-orientations was investigated as a function of film thickness. As the tilting angle of c-axis from the surface normal is smaller, the relative dielectric constant begins to degrade at thinner thickness; eventual…