Hydrochromic Visualization of a Keggin-Type Structure Triggered by Metallic Fluids for Liquid Displays, Reversible Writing, and Acidic Environment Detection

2021 ◽  
Author(s):  
Jun-Heng Fu ◽  
Yun-Tao Cui ◽  
Peng Qin ◽  
Jianye Gao ◽  
Jiao Ye ◽  
...  
Keyword(s):  
Type Structure ◽  
Acidic Environment ◽  
Keggin Type ◽  
Environment Detection

Oxidation of Benzaldehyde to Benzoic Acid with Aqueous Hydrogen Peroxide over Dodecatungstophosphoric Acid

2013 ◽  
Vol 781-784 ◽  
pp. 219-222
Author(s):  
Qiu Ying Huang ◽  
Bei Bei Dong ◽  
Xiu Cheng Zheng
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid ◽  
Catalytic Reaction ◽  
Type Structure ◽  
Optimal Parameters ◽  
Reaction Parameters ◽  
Aqueous Hydrogen Peroxide ◽  
Reaction Conditions ◽  
Prepared Sample ◽  
Keggin Type

Dodecatungstophosphoric acid was synthesized and used as catalyst for oxidation of benzaldehyde to benzoic acid with aqueous hydrogen peroxide. The effect of various catalytic reaction parameters including time, temperatures, and the amount of catalyst on the yield of benzoic acid was investigated in details. The results indicated that the as-prepared sample was in the keggin-type structure and the optimal parameters under the reaction conditions were as follows: 0.5 g of catalyst, reacted at 80 C for 5 h.

Structure and vibrational spectra of tungstovanadate compounds containing an anion of the keggin type. Structure of the salt [(CH3)2NCHO]4−H4[VW11V1O40]·2[(CH3)2·NCHO]·2H2O

1990 ◽  
Vol 31 (2) ◽  
pp. 285-291 ◽  
Author(s):  
R. F. Klevtsova ◽  
L. A. Glinskaya ◽  
E. N. Yurchenko ◽  
L. V. Derkach ◽  
A. M. Rios ◽  
...  
Keyword(s):  
Vibrational Spectra ◽  
Type Structure ◽  
Keggin Type

Synthesis of polypyrrole and polythiophene in aqueous solution of Keggin-type structure heteropolyanions

1991 ◽  
Vol 41 (1-2) ◽  
pp. 407-410 ◽  
Author(s):  
Mieczyslaw Łapkowski ◽  
Gerard Bidan ◽  
Michel Fournier
Keyword(s):  
Aqueous Solution ◽  
Type Structure ◽  
Keggin Type

New semiconducting compounds of diamond type structure

Physica ◽  
1954 ◽  
Vol 3 (7-12) ◽  
pp. 1107-1109 ◽  
Author(s):  
C GOODMAN ◽  
R DOUGLAS
Keyword(s):  
Type Structure ◽  
Semiconducting Compounds ◽  
Diamond Type

Study of Natural Minerals of U-Ryrochlore-Type Structure as Analogues of Plutonium Ceramic Waste-form

2002 ◽  
Vol 713 ◽  
Author(s):  
Roman V. Bogdanov ◽  
Yuri F. Batrakov ◽  
Elena V. Puchkova ◽  
Andrey S. Sergeev ◽  
Boris E. Burakov
Keyword(s):  
Chemical Shifts ◽  
Pyrochlore Structure ◽  
Type Structure ◽  
Waste Form ◽  
X Ray ◽  
Ceramic Waste ◽  
Natural Minerals ◽  
The Us ◽  
Pyrochlore Type

ABSTRACTAt present, crystalline ceramic based on titanate pyrochlore, (Ca,Gd,Hf,Pu,U)2Ti2O7, is considered as the US candidate waste form for the immobilization of weapons grade plutonium. Naturally occuring U-bearing minerals with pyrochlore-type structure: hatchettolite, betafite, and ellsworthite, were studied in orders to understand long-term radiation damage effects in Pu ceramic waste forms. Chemical shifts (δ) of U(Lδ1)– and U(Lβ1) – X-ray emission lines were measured by X-ray spectrometry. Calculations were performed on the basis of a two-dimensional δLá1- and δLδ1- correlation diagram. It was shown that 100% of uranium in hatchettolite and, probably, 95-100% of uranium in betafite are in the form of (UO2)2+. formal calculation shows that in ellsworthite only 20% of uranium is in the form of U4+ and 80% of the rest is in the forms of U5+ and U6+. The conversion of the initial U4+ ion originally occurring in the pyrochlore structure of natural minerals to (UO2)2+ due to metamict decay causes a significant increase in uranium mobility.

pH Dependent Release Potential of Natural Polymers in Sustained Release of Ornidazole From Colon Targeted Delivery System)

2019 ◽  
Vol 9 (02) ◽  
Author(s):  
Sharma Pankaj ◽  
Tailang Mukul
Keyword(s):  
Drug Release ◽  
Delivery System ◽  
Targeted Delivery ◽  
Guar Gum ◽  
Acidic Environment ◽  
Natural Polymers ◽  
Weight Variation ◽  
Curve Determination ◽  
Preformulation Studies

The aim of present work was to prepare colon specific delivery system of Ornidazole using different ratio of shellac, zein and guar gum. From study of various literature it revealed that shellac, zein and guar gum released drug from dosage form at the pH of 6.9, 11.5, 7-9 respectively. The main problem associated with colon targeted drug delivery system is degradation of drug in the acidic environment of stomach to circumvent the present problem different combinations of shellac, zein and guar gum were employed in the formulation of colon targeted tablet. Several preformulation parameters were determined such as melting point, FTIR spectroscopy, preparation of calibration curve, determination of λmax and partition coefficient. After the preformulation studies, next steps were preparation of core tablets, evaluation of core of tablets and coating of tablets. The data obtained from preformulation study seven formulations were developed and evaluated for various parameters. Based on evaluated parameter such as weight variation, friability, dissolution study, invitro drug release etc. the F7 formulation show better results colon targeted tablets. Drug content in F7 formulation was 95% and drug release after 6 hrs was 96%. Formulation containing combination of shellac, zein and guar gum released least amount of drug in the acidic environment of stomach and released most of the drug in colon. It is evide

Inhibition of pipeline steel corrosion in acidic environment using sulphadoxine and pyrimethamine

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Inhibition Efficiency ◽  
Pipeline Steel ◽  
Electrochemical Techniques ◽  
Steel Corrosion ◽  
Acidic Environment ◽  
Inhibitor Concentration ◽  
Adsorption Data ◽  
Corrosion Inhibition Efficiency ◽  
Inhibitive Action ◽  
Sulphadoxine Pyrimethamine

The anti-corrosive properties of sulphadoxine + pyrimethamine (S+P) on the corrosion of pipeline steel in acidic environment were investigated using electrochemical techniques. The results obtained showed an excellent inhibition efficiency which increased with increase in inhibitor concentration. The corrosion inhibition efficiency increased up to 99.04 % at 0.01M S+P and decreased with rise in temperature down to 85.93 % at 333 K and 0.01 M S+P, suggesting a physiosorptive mechanism of adsorption. Also the adsorption data was fitted into Langmuir and Temkin adsorption isotherms, while the inhibitive action was shown to proceed by mixed inhibition mode.

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