Thermodynamics of complexation of sodium, potassium, rubidium, caesium and ammonium ions with 18-crown-6 in acetonitrile and propylene carbonate

1995 ◽  
Vol 91 (24) ◽  
pp. 4375 ◽  
Author(s):  
Kumiko Ohtsu ◽  
Takuji Kawashima ◽  
Kazuhiko Ozutsumi
Keyword(s):  
Propylene Carbonate ◽  
Ammonium Ions ◽  
Sodium Potassium ◽  
Thermodynamics Of Complexation

Thermodynamics of complexation of 18-crown-6 with sodium, potassium, rubidium, caesium and ammonium ions in N,N-dimethylformamide

1994 ◽  
Vol 90 (1) ◽  
pp. 127 ◽  
Author(s):  
Kazuhiko Ozutsumi ◽  
Kumiko Ohtsu ◽  
Takuji Kawashima
Keyword(s):  
Ammonium Ions ◽  
Sodium Potassium ◽  
Thermodynamics Of Complexation

Simultaneous Determination of Sodium, Potassium, and Ammonium Ions by Automated Direct Potentiometry

1974 ◽  
Vol 7 (7) ◽  
pp. 463-472 ◽  
Author(s):  
Ivan Sekerka ◽  
Joseph F. Lechner
Keyword(s):  
Simultaneous Determination ◽  
Ammonium Ions ◽  
Sodium Potassium ◽  
Direct Potentiometry

scholarly journals Vertically Oriented Propylene Carbonate Molecules and Tetraethyl Ammonium Ions in Carbon Slit Pores

2013 ◽  
Vol 117 (11) ◽  
pp. 5752-5757 ◽  
Author(s):  
Masafumi Fukano ◽  
Toshihiko Fujimori ◽  
Julie Ségalini ◽  
Etsuro Iwama ◽  
Pierre-Louis Taberna ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Ammonium Ions ◽  
Slit Pores ◽  
Carbon Slit Pores

scholarly journals The effect of sodium, potassium and ammonium ions on the conformation of the dimeric quadruplex formed by the Oxytricha nova telomere repeat oligonucleotide d(G4T4G4)

1999 ◽  
Vol 27 (15) ◽  
pp. 3018-3028 ◽  
Author(s):  
P. Schultze ◽  
N. V. Hud ◽  
F. W. Smith ◽  
J. Feigon
Keyword(s):  
Ammonium Ions ◽  
Sodium Potassium ◽  
Telomere Repeat ◽  
Oxytricha Nova

Morphology of Poly Amide Nanocomposites Characterized by Transmission Electron Microscopy (TEM) and Electron Spectroscopic Imaging (ESI).

2001 ◽  
Vol 7 (S2) ◽  
pp. 502-503
Author(s):  
W. Heckmann ◽  
F. Ramsteiner ◽  
Ch. Mehler
Keyword(s):  
Building Blocks ◽  
Layered Silicates ◽  
Ammonium Ions ◽  
Melt Mixing ◽  
Sodium Potassium ◽  
Modified Montmorillonite ◽  
Transmission Electron ◽  
Organically Modified ◽  
Alkyl Ammonium ◽  
Potassium Magnesium

The introduction of organophilic layered silicates into a polyamide matrix significantly improves stiffness and strength [1,2]. Two methods are known to prepare such nanocomposites. For both methods cations such as sodium, potassium, magnesium or calcium, located in the interlayer galleries of the layered silicates must be exchanged by quaternary alkyl ammonium ions containing at least one alkyl chain and so rendering the originally hydrophilic into an organophilic silicate. in the insitu-method monomeric caprolactam is intercalated between the modified silicate interlayers and subsequently polycondensated to polyamide. By this method the silicates can be broken down into their nanoscale building blocks as can be shown by TEM and ESI (Fig. 1). Another more direct possibility to delaminate the silicates is melt mixing in an extruder. with both methods similar degrees of delamination can be achieved.This paper presents some of our morphological results on polyamide containing organically modified montmorillonite.

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