This study reveals the connection between silver-doping method, resulting nature and amount of silver dopant together with structural properties long-term antibacterial activity composite coatings.

Micropatterning of living single cells and cell clusters over millimeter–centimeter scale areas is high demand in the development cell-based biosensors. methodologies require both a suitable biomimetic support printing technology. In this work, we present micropatterning mammalian on carboxymethyl dextran (CMD) hydrogel layers using FluidFM BOT contrast to ultrathin (few nanometers thick dry state) CMD films generally used label-free biosensor applications, developed with thicknesses several...

To avoid the restrictions of captive bubble and Wilhelmy plate techniques, a method was introduced for contact angle measurements under equilibrium conditions. It enables to determine even ultralow angles with high precision without prewetting investigated surface because in this case, capillary bridge test liquid is formed from pendant drop used as probe. The determined measured force geometry by using Delaunay's analytical solution. experimentally proved be valid. As demonstration, less...

The validity of various effective medium approximations (EMAs) (Bruggeman, Maxwell−Garnett) was studied for nanostructured systems, where the scale inhomogeneities is comparable to wavelength. Langmuir−Blodgett (LB) layers Stöber silica nanospheres diameters between 40 and 129 nm are excellent model structures experimental verification EMA methods in spectroscopic ellipsometry (SE) evaluation. Nanostructured mono- multilayered films were investigated by SE reflectance spectroscopy....

Thin (ca. 340 nm) chitosan coatings were deposited onto glass substrates via dip-coating, then modified with the methanol solution of decanoic anhydride (0.17-56 mM). NMR, FTIR and XPS measurements confirmed that acylation degree increased from 18 % to 45 %, at highest degree, whole layer was acylated homogeneously by reagent molecules. The coating thickness (up 60 %), refractive index decreased (from 1.541 1.532) due acylation, determined UV-visible spectroscopy. AFM did not reveal...

The nanopatterning of magnetic films by ion implantation is reported. Highly L10-ordered Fe47Pd53 epitaxial alloy on a MgO(001) substrate were covered monolayer silica spheres in Langmuir film balance. Using this sphere layer as an mask, the samples irradiated Ne+ or Fe+ ions with energies 35 keV and 100 keV, respectively. After mask was removed, characterized via conversion electron Mössbauer spectroscopy, longitudinal polar magneto-optical Kerr effect, atomic force microscopy. We find that...

One of the main approaches for contact angle determination using sessile drops with a missing apex (e.g., because presence needle tip) is polynomial drop-profile fitting method. The major disadvantage this procedure that derived highly sensitive to order and number pixels involved in actual fit. In present work, an easily implementable method introduced effectively tackle these drawbacks. Instead itself, applied difference between drop profile circumcircle, independently both sides drop....

Ordered porous structures for photonic application were fabricated on p- and n-type silicon by means of masking against ion implantation with Langmuir-Blodgett (LB) films. LB films from Stöber silica spheres [J. Colloid Interface Sci. 26, 62 (1968)] 350nm diameter applied in the boron phosphorus ion-implantation step, thereby offering a laterally periodic doping pattern. obtained after performing an anodic etch then removed alkaline etching resulting required two-dimensional arrangement. The...

Conventional Rutherford backscattering spectrometry (RBS) in combination with Monte Carlo simulations performed on 3D model cells allow the self-consistent determination of shape, size, and atomic composition silica particles as structures, submicron scale. Spherical ellipsoidal particle shapes spatial distribution implanted Ar Xe unmasked zones underlying substrate is investigated. We demonstrate that both lateral depth information for ordered nano-objects can be derived from multiple RBS...

The electronic properties of graphene can be significantly influenced by mechanical strain. One practical approach to induce strain in is transfer this atomically thin membrane onto pre-patterned substrates with specific corrugation. possibility use nanoparticles impart extrinsic rippling has not been fully explored yet. Here we study the structure and elastic grown chemical vapour deposition transferred a continuous layer SiO2 diameters around 25 nm, prepared on Si substrate...

Chitosan coatings of 353 ± 12 nm thickness were prepared on glass and zinc substrates by dip-coating method to study their barrier-behaviour. The chemically modified increase degree acetylation (DA) from ca. 44 % up 98 resulting a quasi-chitin coating. effect the reaction was studied infrared spectroscopy, structural changes native acetylated investigated UV-Vis spectrophotometry X-ray diffraction. surface properties coated samples characterized wettability measurements - advancing water...

We extend the orbital-dependent electron tunnelling model implemented within three-dimensional (3D) Wentzel–Kramers–Brillouin (WKB) atom-superposition approach for simulating scanning microscopy (STM) by including arbitrary tip orientations. The orientation of is characterized a local coordinate system centred on apex atom obtained rotation with respect to sample system. described Euler angles. Applying our method, we highlight role real-space shape orbitals involved in tunnelling, and...

The advantages of surface pattern and mesoporous character silica thin films were combined, while preserving the interconnected pore system or creating laterally separated porous volumes surrounded by nonpermeable compact zones.

Two-dimensional molecular dynamics computer simulation has been developed to model the compression of Langmuir films composed spherical nanoparticles with arbitrary size distribution. We demonstrate that usual assumption in determination interparticle potentials from surface pressure vs area isotherms (i.e., monodisperse particles perfect hexagonal order) leads a systematic overestimation characteristic length interaction. On basis results simulation, we propose correction method improve...

Polycrystalline Al and Zn samples were irradiated with 30 keV Ar+ ions at room temperature the changes of their electron work functions, Φ measured by Kelvin method. Similarly to what was earlier experienced stainless steel as a function displacement per atom (DPA) seen be extremal character. This can considered manifestation competing formation annealing displacements. Comparing Lang-Kohn theory present experimental results Wigner-Seitz radii evaluated. A differential law for dependence...

Bifunctional hybrid silica sol-gel coatings were synthesized, which showed both increased light transmittance and water-repellence. The as-prepared of variable thickness (100–175 nm) found to have low refractive index (1.250–1.275), high porosity (36%–42%), maximum up 99.8%. Water-repellence the surface was due water contact angle (90°) hysteresis (1–2°). Ellipsometric porosimetry transmission electron microscopy measurements confirmed microporous structure coatings. A systematic...

To design custom magnetic nanostructures, it is indispensable to acquire precise knowledge about the systems in nanoscale range where magnetism forms. In this paper we present effect of a curved surface on evolution ultrathin iron films. Nominally 70 Å thick films were deposited 9 steps 3 different types templates: (a) monolayer silica spheres with 25 nm diameter, (b) 400 diameter and (c) for comparison flat silicon substrate. situ evaporation took place an ultrahigh vacuum chamber using...

Signal enhancement related to indentations in a gold surface layer during micro-Raman scattering experiments was investigated. The were prepared based on colloidal templating and the voids filled with 4-mercaptobenzoic acid (MBA)-loaded nanospheres. periodic void structure has been designed allow selective excitation of single such way that at laser wavelength setup cavity-type plasmon modes localized metallic interface can be effectively excited. modification particles by MBA studied...

The capillary bridge probe method was introduced previously as a high-accuracy contact angle determination relying on bridges hydrophilic and superhydrophilic surfaces [Nagy, N. Langmuir 2019, 35 (15), 5202-5212]. In this work, the behavior of r-ϑ type liquid studied angles were determined hydrophobic surfaces. equilibrium shape these often does not contain neck or haunch region. unknown neck/haunch radius prevents analytical evaluation shape. possible incomplete shapes classified novel...

Chitosan nanocoatings (thickness range of 120–540 nm) were produced on glass, zinc and silicon substrates with dip-coating spin coating techniques to study their pH-dependent wetting swelling behaviour. The coatings N-acetylated the methanolic solution acetic anhydride increase degree acetylation from 36 % 100 (according ATR-FTIR studies). measured contact angles Britton–Robinson (BR) buffer solutions (pH 6.0, 7.4 9.0) lower acetylated surfaces (ca. 50°), than that native counterparts 70°)...

Abstract We have developed a new technique to manufacture diffraction gratings on porous silicon and interface. Using holography facilitate adjust the periodic length of in submicron range. The holographically exposured photoresist applied surface provides mask for ion implantation. sinusoidal grating between substrate layer is achieved after anodic etch process. PS can be removed by alkali etching. Sinusoidal one‐ two‐dimensional been produced with 375 nm length. Their AFM images are shown....