Infrared Spectroscopic Studies of Binary Solutions of Nitric Acid and Water and Ternary Solutions of Nitric Acid, Sulfuric Acid, and Water at Room Temperature:  Evidence for Molecular Nitric Acid at the Surface

2001 ◽  
Vol 105 (10) ◽  
pp. 1890-1896 ◽  
Author(s):  
Husheng Yang ◽  
Barbara J. Finlayson-Pitts
Keyword(s):  
Sulfuric Acid ◽  
Nitric Acid ◽  
Room Temperature ◽  
Spectroscopic Studies ◽  
Binary Solutions ◽  
Ternary Solutions ◽  
Infrared Spectroscopic

scholarly journals Intracluster rearrangement of protonated nitric acid: Infrared spectroscopic studies of H+(HNO3)(H2O)n

1993 ◽  
Vol 99 (11) ◽  
pp. 9307-9309 ◽  
Author(s):  
Yibin Cao ◽  
Jong‐Ho Choi ◽  
Bernd‐Michael Haas ◽  
Matthew S. Johnson ◽  
Mitchio Okumura
Keyword(s):  
Nitric Acid ◽  
Spectroscopic Studies ◽  
Infrared Spectroscopic

Determination of Mercury in Biological Materials

1970 ◽  
Vol 53 (6) ◽  
pp. 1172-1175 ◽  
Author(s):  
M T Jeffus ◽  
J S Elkins ◽  
C T Kenner
Keyword(s):  
Sulfuric Acid ◽  
Standard Deviation ◽  
Nitric Acid ◽  
Biological Samples ◽  
Room Temperature ◽  
Gold Foil ◽  
Average Recovery ◽  
Average Value ◽  
The Difference

Abstract Mercury in biological samples is determined by digestion in nitric acid, sulfuric acid, and permanganate, followed by reduction and aeration for measurement by atomic absorption at room temperature. The average recovery is 95.8% with a standard deviation of 13.3%. The standard deviation, calculated from the difference between duplicates of 23 samples, is 0.063 μg mercury, which represents 9.4% of the average value of the samples. The method is simple and requires approximately 4 hr for completion. Mercury can be confirmed by adsorption on gold foil after maximum absorbance has been obtained during aeration.

scholarly journals Intermolecular Interactions in Acetonitrile + Acetone Binary Mixtures: FTIR Spectroscopic Studies

2021 ◽  
Vol 33 (6) ◽  
pp. 1452-1456
Author(s):  
S.P. Naganandhini ◽  
T. Sangeetha ◽  
G. Arivazhagan
Keyword(s):  
Binary Mixtures ◽  
Intermolecular Interactions ◽  
Room Temperature ◽  
Spectroscopic Studies ◽  
Ftir Spectra ◽  
Binary Solutions ◽  
Molar Ratios ◽  
Bond Interaction

FTIR spectra of neat acetone (ACT), neat acetonitrile (AN) and their binary solutions at various molar ratios 1:2, 1:3, 2:1 and 3:1 (AN:ACT) have been recorded in 4000-400 cm-1 region at room temperature. The acetone is a self-associated molecule and existed as a mixture of monomers, dimers and trimers. The acetonitrile is also a mixture of monomer and weakly bonded dimers. The acetone is associated through the H-bond interaction (ACT)C-H...O=C(ACT) and the acetone and acetonitrile molecules are interacted through the non-classical H-bonds (ACT) C-H···N≡C (AN) and (AN) C-H···O=C (ACT).

Infrared spectroscopic studies of wind-tunnel contamination

1998 ◽  
Author(s):  
A. Walker ◽  
D. Plusquellic ◽  
G. Fraser ◽  
A. Weber ◽  
W. Lafferty
Keyword(s):  
Wind Tunnel ◽  
Spectroscopic Studies ◽  
Infrared Spectroscopic

TIMETAL 35A

Alloy Digest ◽  
2001 ◽  
Vol 50 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Nitric Acid ◽  
Physical Properties ◽  
Chlorine Dioxide ◽  
Heat Treating ◽  
Bend Strength ◽  
Temperature Performance ◽  
Sodium And Potassium

Abstract Titanium shows outstanding resistance to seawater and marine atmospheres. It is also resistant to attack by hot metallic chloride solutions, sodium and potassium hypochlorite, and chlorine dioxide. The metal is resistant to attack by hot nitric acid at concentrations up to 80% and is not attacked by sulfuric acid. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: TI-122. Producer or source: Timet.

Gallium Arsenide Integrated Circuits Decapsulation Technique Using Mixed Acid Chemistry For Die-Level Failure Analysis

2018 ◽  
Author(s):  
Harold Jeffrey M. Consigo ◽  
Ricardo S. Calanog ◽  
Melissa O. Caseria
Keyword(s):  
Gallium Arsenide ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Integrated Circuits ◽  
Failure Analysis ◽  
Mixed Acid ◽  
Optimum Parameters ◽  
Plastic Package ◽  
Fuming Nitric Acid ◽  
Concentrated Sulfuric Acid

Abstract Gallium Arsenide (GaAs) integrated circuits have become popular these days with superior speed/power products that permit the development of systems that otherwise would have made it impossible or impractical to construct using silicon semiconductors. However, failure analysis remains to be very challenging as GaAs material is easily dissolved when it is reacted with fuming nitric acid used during standard decapsulation process. By utilizing enhanced chemical decapsulation technique with mixture of fuming nitric acid and concentrated sulfuric acid at a low temperature backed with statistical analysis, successful plastic package decapsulation happens to be reproducible mainly for die level failure analysis purposes. The paper aims to develop a chemical decapsulation process with optimum parameters needed to successfully decapsulate plastic molded GaAs integrated circuits for die level failure analysis.

The dichotomy between nitration of substituted 1,4-dimethoxybenzenes and formation of corresponding 1,4-benzoquinones by using nitric and sulfuric acid

2000 ◽  
Vol 2000 (3) ◽  
pp. 106-107 ◽  
Author(s):  
C. Waterlot ◽  
B. Haskiak ◽  
D. Couturier
Keyword(s):  
Sulfuric Acid ◽  
Nitric Acid ◽  
Oxidative Demethylation

Various alkyl-substituted p-dimethoxybenzenes (ArH) react readily with nitric acid and sulfuric to form nitro-products (ArNO2). When the nitric acid is used in excess, the nitro-product react via either nitration to dinitro-compound (Ar(NO2)2) or via oxidative demethylation to nitro- p-quinone (Q). As such, the competition between the nitration, polynitration and oxidative dealkylation is effectively modulated by the added nitric acid and the alkyl-substituted p-dimethoxybenzenes.

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