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Preparation of polymeric nanoparticles using a new polymerizable surfactant

100%
Bunio P., Zielińska K., Chlebicki J., Wilk K.
Open Physics
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2011
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vol. 9
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issue 2
570-575
EN
A novel polymerizable surfactant (so-called surfmer) was synthesized and characterized according to its structure, surface activity and polymerization ability. Polymeric micelles (size of 6 and 130 nm) appeared in the polyreaction initiated by free radicals from VA-044. In the presence of the monomer (i.e., methyl methacrylate) microemulsion systems were formed that in turn were transformed into latex entities (size - 40 nm). Additionally, an emulsion polymerization was performed with the use of n-hexadecane as an oil phase resulting in the production of nanocapsules (size in the range - 165–220 nm). The shape and morphologies of the nanoobjects were confirmed using Atomic Force Microscopy (AFM).
2
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Transport characteristics of focused beam deposited nanostructures

80%
Ballestar A., Esquinazi P.
Nanofabrication
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2015
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vol. 2
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issue 1
EN
We review the transport properties of different nanostructures produced by ion- and electron-beam deposition, as prepared as well as after certain treatments. In general, the available literature indicates that the transport properties are determined by conduction processes typical for disordered metallic grains embedded in a carbon-rich matrix, including intergrain tunneling and variable range hopping mechanisms. Special emphasis is given to the superconducting behavior found in certain Tungsten-Carbide nanostructures that, in a certain field and temperature range, is compatible with that of granular superconductivity. This granular superconductivity leads to phenomena like magnetic field oscillations as well as anomalous hysteresis loops in the magnetoresistance.
3
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Surface Modification of Solids by Extreme Ultraviolet and Plasma Treatment

80%
Bartnik A., Fiedorowicz H., Skrzeczanowski W., Czwartos J., Wachulak P., Jarocki R., Kostecki J.
Acta Physica Polonica A
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2018
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vol. 133
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issue 2
267-270
EN
In this paper, results of surface modification, using a laser-produced plasma source of extreme ultraviolet, and the extreme ultraviolet induced low temperature plasmas, are presented. It was shown that irradiation of different materials by intense extreme ultraviolet pulses results in strong changes of the surface morphology. Examples of micro- and nanostructures obtained this way are presented. It was also demonstrated that a dual action of the radiation pulses and low temperature plasmas allows to modify a molecular structure of exposed materials.
4
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Cold plasma in the nanotechnology of catalysts

70%
Tyczkowski J., Kapica R.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 1
36-42
EN
In the paper the preparation of catalysts with the use of cold plasmas is discussed. A special attention is focused on nanocatalysts. In general, there are three main trends in this field: (1) plasma enhanced preparation of "classical" catalysts, (2) plasma sputtering of catalytically active compounds, especially metal and metal oxide nanoparticles, and (3) plasma-enhanced metal-organic chemical vapor deposition (PEMOCVD) of very thin metal and metal oxide films with specific nanostructure. It is shown that the cold plasma techniques are very effective methods for designing the nanocatalysts with distinct and tunable chemical activity, specificity and selectivity. Finally, our preliminary investigations concerning CoOX catalytic films fabricated by the PEMOCVD method are presented.
5
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Identifying the crossover between growth regimesvia in-situconductance measurements in focused electron beam induced deposition

70%
Winhold M., Weirich P. M., Schwalb C. H., Huth M.
Nanofabrication
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2014
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vol. 1
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issue 1
EN
Focused electron beam induced deposition presents a promising technique for the fabrication of nanostructures. However, due to the dissociation of mostly organometallic precursor molecules employed for the deposition process, prepared nanostructures contain organic residues leading to rather low conductance of the deposits. Post-growth treatment of the structures by electron irradiation or in reactive atmospheres at elevated temperatures can be applied to purify the samples. Recently, an in-situ conductance optimization process involving evolutionary genetic algorithm techniques has been introduced leading to an increase of conductance by one order of magnitude for tungsten-based deposits using the precursor W(CO)6. This method even allows for the optimization of conductance of nano-structures for which post-growth treatment is not possible or desirable. However, the mechanisms responsible for the observed enhancement have not been studied in depth. In this work, we identified the dwell-time dependent change of conductivity of the samples to be the major contributor to the change of conductance. Specifically, the chemical composition drastically changes with a variation of dwelltime resulting in an increase of the metal content by 15 at% for short dwell-times. The relative change of growth rate amounts to less than 25 % and has a negligible influence on conductance. We anticipate the in-situ genetic algorithm optimization procedure to be of high relevance for new developments regarding binary or ternary systems prepared by focused electron or ion beam induced deposition.
6

Methods of ZnO nanoparticles synthesis

61%
ŻELECHOWSKA K.
BioTechnologia
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2014
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vol. 95
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issue 2
150-159
EN
Zinc oxide nanostructures are interesting nanomaterials with a wide range of applications. Since the physical and chemical properties of ZnO nanoparticles are influenced both by their shape and size, a control of morphology of ZnO structures is needed for their commercial usage. Different chemical, physical, and biological methods used to produce ZnO nanostructures can be found in the literature. The production of ZnO nanoparticles using so-called green methods, using, for example, plant extracts or living organisms, is being investigated as these methods are environmentally friendly and of low-cost. This review also discusses the trends in the biological synthesis of semiconducting nanoparticles.
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