Characterization of Diffusion-Controlled Mass Transport through Nanoporous and Nanothin Films Plasma Polymerized on a Sputtered Platinum Electrode

2005 ◽  
Vol 109 (40) ◽  
pp. 18839-18845 ◽  
Author(s):  
Hitoshi Muguruma ◽  
Nobuaki Itazu ◽  
Satoshi Miura
Keyword(s):  
Mass Transport ◽  
Platinum Electrode ◽  
Diffusion Controlled

scholarly journals Synthesis and Polymerization Kinetics of Rigid Tricyanate Ester

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1686
Author(s):  
Andrey Galukhin ◽  
Roman Nosov ◽  
Ilya Nikolaev ◽  
Elena Melnikova ◽  
Daut Islamov ◽  
...  
Keyword(s):  
Kinetic Analysis ◽  
Single Step ◽  
Polymerization Kinetics ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Diffusion Controlled ◽  
Polymerization Product ◽  
The One ◽  
Kinetics Of

A new rigid tricyanate ester consisting of seven conjugated aromatic units is synthesized, and its structure is confirmed by X-ray analysis. This ester undergoes thermally stimulated polymerization in a liquid state. Conventional and temperature-modulated differential scanning calorimetry techniques are employed to study the polymerization kinetics. A transition of polymerization from a kinetic- to a diffusion-controlled regime is detected. Kinetic analysis is performed by combining isoconversional and model-based computations. It demonstrates that polymerization in the kinetically controlled regime of the present monomer can be described as a quasi-single-step, auto-catalytic, process. The diffusion contribution is parameterized by the Fournier model. Kinetic analysis is complemented by characterization of thermal properties of the corresponding polymerization product by means of thermogravimetric and thermomechanical analyses. Overall, the obtained experimental results are consistent with our hypothesis about the relation between the rigidity and functionality of the cyanate ester monomer, on the one hand, and its reactivity and glass transition temperature of the corresponding polymer, on the other hand.

Synthesis and Characterization of Lanthanide Metal-Organic Frameworks with Perfluorinated Linkers

2016 ◽  
Vol 98 ◽  
pp. 70-74
Author(s):  
Andrius Laurikėnas ◽  
Jurgis Barkauskas ◽  
Aivaras Kareiva
Keyword(s):  
Metal Organic Frameworks ◽  
Aqueous Media ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Lanthanide Elements ◽  
Diffusion Controlled ◽  
Benzenedicarboxylic Acid ◽  
Metal Organic ◽  
Lanthanide Metal

In this study, lanthanide elements (Ln3+) and 2,3,5,6-tetrafluoro-1,4-benzenedicarboxylic acid (TFBDC) based metal-organic frameworks (MOFs) were synthesized by precipitation and diffusion-controlled precipitation methods. Powders insoluble in aqueous media and polar solvents were obtained. The microstructure and properties of Ln3+ MOFs were evaluated and discussed. X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and fluorescence spectroscopy (FLS) were carried out to characterize Ln3+ MOF's crystallinity, the microstructure, chemical composition and optical properties.

scholarly journals Synthesis and Characterization of Mixed Metal Oxide Nanocomposite Energetic Materials

2003 ◽  
Vol 800 ◽  
Author(s):  
Brady J. Clapsaddle ◽  
Lihua Zhao ◽  
Alex E. Gash ◽  
Joe H. Satcher ◽  
Kenneth J. Shea ◽  
...  
Keyword(s):  
Mass Transport ◽  
Metal Oxide ◽  
Energetic Materials ◽  
Silicon Oxide ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Mixed Metal Oxide ◽  
Organic Additives ◽  
Metal Oxide Silicon

ABSTRACTIn the field of composite energetic materials, properties such as ingredient distribution, particle size, and morphology, affect both sensitivity and performance. Since the reaction kinetics of composite energetic materials are typically controlled by the mass transport rates between reactants, one would anticipate new and potentially exceptional performance from energetic nanocomposites. We have developed a new method of making nanostructured energetic materials, specifically explosives, propellants, and pyrotechnics, using sol-gel chemistry. A novel sol-gel approach has proven successful in preparing metal oxide/silicon oxide nanocomposites in which the metal oxide is the major component. Two of the metal oxides are tungsten trioxide and iron(III) oxide, both of which are of interest in the field of energetic materials. Furthermore, due to the large availability of organically functionalized silanes, the silicon oxide phase can be used as a unique way of introducing organic additives into the bulk metal oxide materials. As a result, the desired organic functionality is well dispersed throughout the composite material on the nanoscale. By introducing a fuel metal into the metal oxide/silicon oxide matrix, energetic materials based on thermite reactions can be fabricated. The resulting nanoscale distribution of all the ingredients displays energetic properties not seen in its microscale counterparts due to the expected increase of mass transport rates between the reactants. The synthesis and characterization of these metal oxide/silicon oxide nanocomposites and their performance as energetic materials will be discussed.

Characterization of step-edge barrier crossing of para-sexiphenyl on the ZnO (101̄0) surface

2016 ◽  
Vol 18 (36) ◽  
pp. 25329-25341 ◽  
Author(s):  
Karol Palczynski ◽  
Philipp Herrmann ◽  
Georg Heimel ◽  
Joachim Dzubiella
Keyword(s):  
Thin Film ◽  
Mass Transport ◽  
Organic Molecules ◽  
Optoelectronic Devices ◽  
Thin Film Deposition ◽  
Essential Elements ◽  
Transport Processes ◽  
Film Deposition ◽  
Conjugated Organic Molecules

Mass transport processes of conjugated organic molecules (COMs) on inorganic surfaces are essential elements in thin film deposition for hybrid optoelectronic devices.

In situ characterization of kinetics and mass transport of PbSe nanowire growth via LS and VLS mechanisms

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 5874-5878 ◽  
Author(s):  
Miao Song ◽  
Jaewon Lee ◽  
Bin Wang ◽  
Benjamin A. Legg ◽  
Shenyang Hu ◽  
...  
Keyword(s):  
Mass Transport ◽  
Nucleation And Growth ◽  
In Situ Characterization ◽  
Transport Pathways ◽  
Structure Control ◽  
Transmission Electron ◽  
Gas Heating ◽  
Dependent Mass

We grew binary PbSe nanowires in an in situ gas-heating cell in a transmission electron microscope and elucidated species dependent mass transport pathways and correlations among supersaturation, nucleation, and growth kinetics, enabling structure control.

Characterization of Platinum Electrode Surfaces by Electrochemical Surface Forces Measurement

2017 ◽  
Vol 121 (47) ◽  
pp. 26406-26413 ◽  
Author(s):  
Sho Fujii ◽  
Motohiro Kasuya ◽  
Kazue Kurihara
Keyword(s):  
Platinum Electrode ◽  
Surface Forces ◽  
Electrode Surfaces

Characterization of mass-transport grown GaN by hydride vapour-phase epitaxy

2004 ◽  
Vol 273 (1-2) ◽  
pp. 118-128 ◽  
Author(s):  
T. Paskova ◽  
P.P. Paskov ◽  
E.M. Goldys ◽  
E. Valcheva ◽  
V. Darakchieva ◽  
...  
Keyword(s):  
Mass Transport ◽  
Vapour Phase ◽  
Vapour Phase Epitaxy
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