Atomic force microscopy analysis of nanoparticles in non-ideal conditions

Nanoparticles are often measured using atomic force microscopy or other scanning probe microscopy methods. For isolated nanoparticles on flat substrates, this is a relatively easy task. However, in real situations, we often need to analyze nanoparticles on rough substrates or nanoparticles that are not isolated. In this article, we present a simple model for realistic simulations of nanoparticle deposition and we employ this model for modeling nanoparticles on rough substrates. Different modeling conditions (coverage, relaxation after deposition) and convolution with different tip shapes are used to obtain a wide spectrum of virtual AFM nanoparticle images similar to those known from practice. Statistical parameters of nanoparticles are then analyzed using different data processing algorithms in order to show their systematic errors and to estimate uncertainties for atomic force microscopy analysis of nanoparticles under non-ideal conditions. It is shown that the elimination of user influence on the data processing algorithm is a key step for obtaining accurate results while analyzing nanoparticles measured in non-ideal conditions

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Import 20/04/2006Prezenční výpůjčkaVŠB - Technická univerzita Ostrava. Ekonomická fakulta. Katedra (116) marketingu a obchod

A study of varnish influence on inkjet printing lightfastness

Protection of the colour photographs and prints seems as an inevitable step in the preservation of the cultural heritage, because up to 80% of the institutions dealing with cultural heritage have inkjet prints in their collections. Thus it is important to know how they behave when exposed to the environmental conditions. The most harming are light and airborne pollutants. Appling barrier layer, which should protect these prints from ozone and UV light harm, seems like an elegant solution. As the test target was selected i-1 RGB 1.5 target and this target was printed on microporous Ilford Smooth Gloss inkjet paper with dye-based ink set and one pigment ink set. The accelerated ageing test was performed in xenon test chamber Q-Sun with daylight filter on inkjet prints protected by Hahnemühle and Tetenal varnishes. The varnishes were also applied on clear PP films for determination of their spectral change during the light exposure. The reflectance spectra of samples were measured by spectrophotometer i-1. The changes in the gamut volumes were plotted as a function of exposure dose. From this function, fading rate coefficient was determined for each sample. Gamut volumes, fading rate coefficients and gamut visualizations were calculated and made by using VolGa utility

Changes of gamut volume during long-term tests

The stability of inkjet prints and photographs is influenced by the factors of the surrounding environment. The most harmful factors of environment are the light and the pollutants like ozone. Durability of inkjet prints is besides the ink composition, affected by the type of receiving layer. In this paper will be discussed the lightfastness of inkjet prints and photographs during the long-term ageing tests. Inkjet prints were prepared using both dye-based and pigment-based inks. The samples were exposed to the real conditions. During the test light conditions were precisely monitored. The reflective spectra of samples were measured by spectrophotometer Gretag MacBeth spectrolino. From these data the L*a*b* values were calculated, which were used to gamut visualization as 3D in L*a*b* space. Gamut volume of samples was evaluated by program VolGa, which is a Matlab based utility useful for the monitoring and evaluation of lightfastness of print. VolGa was designed to calculate the Volume of Gamut. This utility currently provides also other features and functions, like gamut visualization, generation of colour difference heat map, calculation of fading rate coefficient, etc

Optické vlastnosti titaničitých povlaků připravené inkoustovým tiskem micel sol-gelové kompozice

This contribution deals with a study on the optical properties of titania thin films prepared by direct inkjet patterning of the reverse micelles sol-gel composition onto glass supports. The layers properties have been investigated by optical microscopy, SEM and spectroscopic ellipsometry in the range of UV-VIS. The influence of calcinations temperature on the optical constants is discussed.Tento příspěvek se zabývá studií optických vlastností titaničitých tenkých vrstev připravených inkoustovým tiskem micel sol-gelové kompozice na podložních sklech. Vlastnosti vrstev byly studovány na optickém mikroskopu, SEM a spektroskopickou elipsometrií v rozsahu UV-VIS. Vliv teploty kalcinace na optických konstant je diskutován

Inkjet printing of tungsten sol-gel ink

Tungsten (VI) oxide − WO3 is one of the widely studied inorganic semiconductors with outstanding chromogenic properties. Its unique optical and electrical properties enable application in energy efficient systems (e.g. smart windows), sensors, displays, storage units, electric and photo catalysts and solar cells. The WO3 layers are mostly made by expensive vacuum sputtering (PVD), chemical vapour deposition (CVD) and electro-deposition, but it is also possible to deposit layers from sol-gel solutions using dip-coating or spin-coating. On the other hand printing of the WO3 layers is unexplored area, although enabling flexibility of the substrates, patterning, multi-layer deposition and R2R mass production favouring low cost of the final devices. According to our knowledge this is the first report showing the feasibility of inkjet printing of tungsten sols

Tištěné vzory oxidu titaničitého podpořeného organosilikátovou matricí připravené za studena

Preparation of photocatalytic active layers by cold-setting inkjet printing. Comparison of printed, UV-cured and sintered layers; their physical properties, as well as, photocatalytic and electrophotocatalytic properties.Příprava fotokatalyticky aktivních vrstev metodou inkjet printingu za studena. Srovnání vytištěných, UV-ošetřených a teplotně ošetřených vrstev; jejich fyzikálních vlastností, stejně jako fotokatalytických a elektrofotokatalytických vlastností