Temat: bromide - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Preparation and characterization of ultra-fine silver bromide suspension
Autorzy:: Król-Gracz, A.
Michalak, E.
Nowak, P.
Dyonizy, A.
Powiązania:: https://bibliotekanauki.pl/articles/115949.pdf
Data publikacji:: 2011
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Tematy:: nanoparticles
silver bromide
synthesis method
gelatine
Opis:: This paper present the results of studies on ultra fine-crystalline silver bromide suspensions, which were stabilized by gelatin and excess of bromide ions. Relation between dosing rate of reactants to size of obtained silver bromide crystals was investigated. Granulometric properties obtained nanocrystals were studied by turbidity method and by technique of Dynamic Light Scattering (DLS). Additionally, a photomicrograph of suspension using Scanning Electron Microscopy (SEM) was performed.
Źródło:: Challenges of Modern Technology; 2011, 2, 2; 38-42
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Research on solvent systems with tetra-n-butylammonium bromide for counter-current chromatography of betalains
Autorzy:: Spórna-Kucab, A.
Wysoczańska, J.
Bartel, A.
Świergosz, T.
Szot, D.
Wybraniec, S.
Powiązania:: https://bibliotekanauki.pl/articles/115657.pdf
Data publikacji:: 2016
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Tematy:: betanin
betalains
tetra-n-butylammonium bromide
high-speed counter-current chromatography
Beta vulgaris L.
betanina
betalainy
bromek tetra-n-butyloamoniowy
HSCCC
Opis:: In this study, new two-phase solvent systems for counter-current chromatography (CCC) consisting of n-butanol and water as well as various amounts of acetic acid, acetonitrile, ethanol, acetone or ethyl acetate were tested. Additionally, tetra-n-butylammonium bromide (TBAB) was introduced into the system in the form of aqueous solutions or phosphate-citrate buffer (pH 6.7) in order to form ion-pairs with betalains. The selection of buffer pH was based on their ability to create ion pairs by tetraalkylammonium salts, with selected betalains under these conditions. In this study, it is shown that the settling time of two phases is longer with the increase of acetic acid/acetonitrile/ethanol/acetone/ethyl acetate. For selected solvent systems with high amounts of acetonitrile, ethanol and acetone two phases were not observed. The systems with acetone have the largest increase of settling time. Ethyl acetate systems were characterized by a slow settling time increase. In systems containing additionally 2% aqueous TBAB, smaller changes in settling time than in similar systems without TBAB were observed. Addition of TBAB in the buffer resulted in a prolongation of settling time. Solvent systems in which the separation between the aqueous and organic phases was visually best, were selected from among all the tested systems and the betalain partition coefficients were measured by LC-DAD-ESI-MS. The best results were observed for systems: n-butanol-water-acetic acid (2:2.5:0.75, v/v/v), n-butanol-water-acetic acid (2:2.5:1, v/v/v) and n-butanol-TBAB in water-acetonitrile (2:2.5:0.5, v/v/v).
Źródło:: Challenges of Modern Technology; 2016, 7, 1; 12-16
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Dostawca treści:: Biblioteka Nauki

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