pK a of the hydrazinium ion and the reaction of hydrogen atoms with hydrazine in aqueous solution

1996 ◽  
Vol 92 (14) ◽  
pp. 2541 ◽  
Author(s):  
Stephen P. Mezyk ◽  
Miyoko Tateishi ◽  
Roy MacFarlane ◽  
David M. Bartels
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Atoms

Circuit Pattern cu Deposition on Polyimide Surface Using ArF Excimer Laser

1998 ◽  
Vol 546 ◽  
Author(s):  
M. Tomita ◽  
M. Murahara
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Excimer Laser ◽  
Copper Sulfate ◽  
Electroless Plating ◽  
Atmospheric Pressure ◽  
Hydrogen Atoms ◽  
Arf Excimer Laser ◽  
Cu Thin Film ◽  
Copper Substitution

AbstractCircuit patterned nucleation of copper atoms onto polyimide surface was demonstrated by using ArF excimer laser (λ =193nm) and copper sulfate aqueous solution at an atmospheric pressure. Photo-excited C-H bonds of the polyimide surface were effectively dehydrated with hydrogen atoms which were photodissociated from the water. The dangling bonds of the dehydrated hydrogen atoms were combined with the oxygen and the copper atoms which were photodissociated by copper-sulfate aqueous solution. Thus, C-O-Cu bonds were formed on the surface. After this copper substitution, it was carried out onto the nucleated parts by usual electroless plating at 70°C. In this process, the conductive circuit pattern Cu thin film was deposited on polyimide surface.

Site of H Atom Attack on Uracil and Its Derivatives in Aqueous Solution

1985 ◽  
Vol 40 (3-4) ◽  
pp. 292-294 ◽  
Author(s):  
Suresh Das ◽  
David J. Deeble ◽  
Clemens von Sonntag
Keyword(s):  
Aqueous Solution ◽  
Double Bond ◽  
Pulse Radiolysis ◽  
Hydrogen Abstraction ◽  
Methyl Groups ◽  
Oh Radicals ◽  
Hydrogen Atoms ◽  
Sugar Moiety ◽  
Reducing Properties

Hydrogen atoms from the radiolysis of water at pH 1.6 add to the 5,6-double bond of pyrimidines. The preferen­tial site of attack is the C(5) position (values in brackets) in the case of 6-methyluracil (87%), 1,3-dimethyluracil (71%), uracil (69%) and poly(U) (60%). This reaction yields a radical of reducing properties which can be monitored by its reaction with tetranitromethane in a pulse radiolysis experiment. In thymine (37%), thymidine (32%) and 1,3-dimethylthymine (25%) H-addition no longer pre­ferentially occurs at C(5), but addition is now mainly at C(6). Hydrogen abstraction from the methyl groups or the sugar moiety is negligible (≦ 5.5%). A comparison is made with literature values for the equivalent reactions of OH radicals.

Determination of semi-empirical relationship between the manganese and hydrogen atoms ratio, physical density and concentration in an aqueous solution of manganese sulphate

2010 ◽  
Vol 45 (10) ◽  
pp. 1505-1508 ◽  
Author(s):  
Guilherme Rodrigues Bittencourt ◽  
Karla Cristina de Souza Patrão ◽  
Sandro Passos Leite ◽  
Walsan Wagner Pereira ◽  
Evaldo Simões da Fonseca
Keyword(s):  
Aqueous Solution ◽  
Empirical Relationship ◽  
Hydrogen Atoms ◽  
Manganese Sulphate ◽  
Physical Density ◽  
Semi Empirical
Sign in / Sign up

Export Citation Format

Share Document