Temat: rm - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Positron Annihilation Lifetime Spectroscopy Study of the Formation of Mesoporous Materials from the Zeolite Precursor
Autorzy:: Bosnar, S.
Bosnar, D.
Gržeta, B.
Powiązania:: https://bibliotekanauki.pl/articles/1196124.pdf
Data publikacji:: 2014-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
81.05.Rm
61.43.Gt
Opis:: In this work, positron annihilation lifetime spectroscopy was used for the structural characterisation of porous materials prepared from amorphous zeolite precursors acting as the starting materials and hexadecyltrimethylammonium bromide acting as a mesoporous template. The best fits of the obtained lifetime spectra provide a four-component exponential decomposition. The lifetime values of the long-lived components point to the presence of mesoporous voids. Infrared and X-ray analyses show that the obtained materials consist partly of a crystalline zeolite structure.
Źródło:: Acta Physica Polonica A; 2014, 125, 3; 775-777
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Polymeric Track Etched Membranes - Application for Advanced Porous Structures Formation
Autorzy:: Sartowska, B.
Starosta, W.
Apel, P.
Orelovitch, O.
Blonskaya, I.
Powiązania:: https://bibliotekanauki.pl/articles/1400430.pdf
Data publikacji:: 2013-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.82.Pv
81.16.Be
81.05.Rm
61.43.Gt
Opis:: Track etched membranes are porous systems consisting of a thin polymer foil with channels from surface to surface. Latent ion tracks are the result of the passage of swift ions through solid matter and they can be etched selectively. As a result, conical, cylindrical or other shape channels can be obtained. The increasing interest in the polymer track etched membranes with nanochannels is connected with development and creation of nanoporous materials of unique properties. The template synthesis method based on deposition of materials inside well-defined uniform pores of membranes offers unique possibilities of formation of one-dimensional, high aspect ratio (length to diameter) cylindrical species having form of rods, wires, tubules, multiwall tubules and multilayer rods, practically from any solid material. Metal-organic frameworks are a class of hybrid materials comprising metal ion-based vertices and organic ligands (linkers) which serve to connect the vertices into one-, two- or three-dimensional periodic structures. A specific property of porous structures is their intrinsic porosity, which renders them potentially useful for gas storage, separation and catalysis. The possibility of obtaining a new composite material: polymeric track etched membrane with pores filled with hybrid porous material has been demonstrated.
Źródło:: Acta Physica Polonica A; 2013, 123, 5; 819-821
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Novel Molding Method and Enhanced Cell Homogeneity in the Powder Metallurgical Route for Production of Closed Cell Al-Foam
Autorzy:: Erturk, A.
Sahin, T.
Powiązania:: https://bibliotekanauki.pl/articles/1033369.pdf
Data publikacji:: 2017-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Rm
82.33.Ln
61.43.Gt
61.05.cp
68.37.Hk
Opis:: TiH₂ content, mixing, pressing, different mold filling rate as the factors which affect foaming process on the powder metallurgical route were investigated. TiH₂ was added in the amount of 0.5-1-1.5-2 wt% to adjust the proper amount. Differential scanning calorimetry tests were conducted on the TiH₂ powders in order to obtain optimum hydrogen releasing condition. Aluminum and TiH₂ powders were blended with the different speed-time combination. The mix was compacted at different pressures with the aim of explaining of the oxide layer deformation. An acceptance-rejection criterion was developed and used in pore analysis. Also, the using of a borosilicate glass molding technique are completely original and a new approach.
Źródło:: Acta Physica Polonica A; 2017, 131, 1; 39-42
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Porous Silicon Formation by Metal-Assisted Chemical Etching
Autorzy:: Lipinski, M.
Cichoszewski, J.
Socha, R.
Piotrowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/1807542.pdf
Data publikacji:: 2009-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.16.Rf
81.05.Rm
78.55.Mb
61.43.Gt
78.67.Bf
Opis:: The method of metal-assisted chemical etching produces a porous silicon layer. Palladium particles are deposited on both: multi-crystalline and Czochralski grown mono-crystalline Si wafers by immersing them in $PdCl_{2}$ solution for 1 to 3 min. X-ray photoelectron spectroscopy analysis of Pd clusters shows a decrease in Pd metal fraction by prolonged immersion time t from $F_{Pd}$ = 71.2% for t = 1 min to $F_{Pd}$ = 61.4% for t = 3 min due to Pd oxidation process. Porous silicon forms by metal-assisted chemical etching in a HF:$H_{2}O_{2}$ solution for 1 to 3 min. Photoluminescence of metal-assisted chemical etched samples exhibits the peak with a maximum of t at λ=650 nm independent of the etching time. Simultaneously, the intensity of the photoluminescence spectra strongly decreases for extended etching time t = 3 min. This behavior is attributed to increasing layer macroporosity, which strongly reduces amount of light emitting nanocrystallites.
Źródło:: Acta Physica Polonica A; 2009, 116, S; S-117-S-119
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Luminescence of Lanthanides from Xerogels Embedded in Mesoporous Matrices
Autorzy:: Gaponenko, N.
Powiązania:: https://bibliotekanauki.pl/articles/1814047.pdf
Data publikacji:: 2007-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.20.Fw
83.80.Jx
81.05.Rm
78.55.Mb
61.43.Gt
82.45.Cc
42.70.Qs
78.55.Ap
78.60.-b
Opis:: The report summarizes peculiarities of synthesis and luminescence properties of porous silicon, porous anodic alumina and artificial opals with the inclusions of sol-gel derived oxides (xerogels), doped with Er, Tb, and Eu. Origin of strong luminescence of lanthanides from xerogels in mesoporous matrices is discussed.
Źródło:: Acta Physica Polonica A; 2007, 112, 5; 737-749
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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