The thermal decomposition of silver permanganate

Prout, E. G.; Tompkins, F. C.

doi:10.1039/tf9464200468

Cited by 107 publications

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“…This sigmoidal type of rate curve has been reported previously by other investigators (3, 10, 13) and indicates that more than one reaction rate may be involved in the decomposition. Attempts to fit experimental d a t a to equations derived by Prout and Tompkins (9) in their studies of the decomposition of silver permanganate were unsatisfactory. From the observations of the effect of crystal size, i t is unlikely that kinetic equations can be derived without considering the rate of reaction as a function of the initial particle size of the crystals.…”

Section: Resultsmentioning

confidence: 99%

“…(101 Equation [3a] goes to completion and equation [3b] goes to approxin~ately 37.5y0 completion, the Ag20 and O2 being formed by the deco~nposition of Ago according to equation [9]. Equation The over-all agreement of experimental values with those calculated on the basis of the mechanisnl outlined above is good and it therefore appears that the proposed mechanism may be correct.…”

Section: Analysis Of Decomposition Productsmentioning

confidence: 90%

“…Considering equation [3] [3]. On the basis of the calculation of the percentage of oxygen and AgrO found experimentally, the following mechanism may be proposed: [9] Ag20 + 2Ag + $02.…”

Section: Analysis Of Decomposition Productsmentioning

confidence: 99%

“…A mechanism based on differences in geometric forms and dinlensions of the decomposition products is attractive; a s M n 0 2 is a centered tetragon cell and silver permanganate is monoclinic in a unit cell of four molecules. T h u s one could propose, a s has been done b y Prout and Tompkins (9), t h a t the surface array of deco~nposition procluct n~olecules produces lateral strain. However, it is difficult to reason t h a t the decomposition can produce lateral strain as the decomposition products d o not have a n y rigid geometric crystal form.…”

Section: Gr41yt Axd K a T Z : 0xid:i Tion Of Carroiv I!ionoxide 111mentioning

confidence: 99%

“…Prout and Tompkins (9) suggested from kinetic evidence that the chemical nature of the deconlposition is best represented by: 4AgMnOl-t 2Ag0 + 4Mn02 + 302.…”

Section: Introductionmentioning

confidence: 99%

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The Oxidation of Carbon Monoxide by Solid Permanganate Reagents: Vii. Thermal Decomposition of Silver Permanganate

Grant¹,

Katz²

1954

Can. J. Chem.

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The thermal decomposition in a vacuum a t 100°C. of both whole and ground crystals of pure dry silver permangarlate was followed by the measurements of increase in pressure and of loss in weight. The derolnposition products were determined by analysis and calculations to be silver oxide, silver, manganese dioxide, silver permanganite, and oxygen. On the basis of chemical analysis the following mechanism of decomposition is proposed:(1) AgMn04 -----f AgI\/In03 + 402, (2) 2 A g M n 0 3 d A g P + 2MnOz + $02,The reaction proposed In equation (I) goes to con~pletion, while the reaction proposed in equation (2)

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Decomposition Productsmentioning

confidence: 90%

“…Considering equation [3] [3]. On the basis of the calculation of the percentage of oxygen and AgrO found experimentally, the following mechanism may be proposed: [9] Ag20 + 2Ag + $02.…”

Section: Analysis Of Decomposition Productsmentioning

confidence: 99%

Section: Gr41yt Axd K a T Z : 0xid:i Tion Of Carroiv I!ionoxide 111mentioning

confidence: 99%

“…Prout and Tompkins (9) suggested from kinetic evidence that the chemical nature of the deconlposition is best represented by: 4AgMnOl-t 2Ag0 + 4Mn02 + 302.…”

Section: Introductionmentioning

confidence: 99%

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The Oxidation of Carbon Monoxide by Solid Permanganate Reagents: Vii. Thermal Decomposition of Silver Permanganate

Grant¹,

Katz²

1954

Can. J. Chem.

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The thermal decomposition of granular and fluid soybean lecithins

Ross¹,

Lemay²,

Takacs³

1985

Can J Chem Eng

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The effect of heat on the decomposition of two grades of soybean lecithin has been examined up to 600°C using differential scanning calorimetry and thermogravimetry. Studies were carried out in both air and argon and a kinetic analysis of the isothermal rates of reaction was attempted. Three principal decomposition stages were distinguished in argon and four in air for a water-dispersible lecithin typical of the quality of the material used in many industrial applications. Gas chromatography showed that the principal gases evolved from 50 to 600°C in argon from the water-dispersible lecithin in contact with aluminum surfaces were C, -C6 hydrocarbons, carbon dioxide, carbon monoxide, water and traces of hydrogen. L'effet de la temperature sur la decomposition de deux categories de lkcithine provenant de la graine de soja a ett examine jusqu'a 600°C I'aide de la calorimCtrie diffkrentielle a balayage et de la thermogravimetrie. Les etudes ont ttt effectuees en presence d'air et d'argon, et une analyse de la cinetique des reactions isothermes a Cte tentee. Trois principales Ctapes de decomposition ont etC distinguees sous atmosphere d'argon et quatre lorsque l'air est employe, et ce, a partir d'une lecithine dispersable dans l'eau ayant une qualit6 typique de ce qui est utilisC dans plusieurs applications industrielles. Des analyses par chromatographie en phase gazeuse ont dCmontrC que les principaux gaz form&, lorsque la lecithine en contact avec de l'alurninium est chauffke a des tempkratures de 50 a 600°C en presence d'argon, sont des hydrocarbures de type C, a Cbr du monoxyde et bioxyde de carbone, de l'eau et des traces d'hydrogbne.he industrial uses, properties and compositions of leci-

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Interaction of Dipalmitoyl Phosphatidylcholine with n‐Hexadecanol in Monolayer and Liposome

Chen

Chang

Yang

et al. 2007

J Chinese Chemical Soc

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The monolayer collapse behavior of n‐hexadecanol/dipalmitoyl phosphatidylcholine (DPPC) was investigated in this study at the air/water interface at 37 °C. Surface pressure variations with time for the mixed monolayers of DPPC with 20 mol% and 50 mol% n‐hexadecanol at corresponding collapse points were recorded by a Langmuir trough system. In addition, the interaction of n‐hexadecanol with a pure DPPC monolayer was identified by fluorescence microscopy (FM). The results demonstrated distinct differences between these systems; according to our observation, the higher the ratio of n‐hexadecanol to DPPC, the more nucleation domains can be induced. The FM images demonstrated that pronounced domain formation was associated with a longer relaxation time of the collapsed DPPC and DPPC/n‐hexadecanol monolayers, and the presence of n‐hexadecanol appeared to enhance the relaxation processes. The liposome was prepared by the thin‐film hydration method. The average diameter of DPPC and DPPC/n‐hexadecanol liposomes was investigated by dynamic light scattering. It is shown that the diameter of DPPC liposome with n‐hexadecanol is smaller than pure DPPC liposome at the initial state. After 24 hours, DPPC/n‐hexadecanol liposome became larger than pure DPPC liposome and lasted for the next four days. The effects of a greater ratio of n‐hexadecanol did not play an important role in DPPC liposome formation based on our dynamic light scattering analysis. Our result demonstrated that n‐hexadecanol might affect the DPPC liposome stability. The increased ratio of n‐hexadecanol in DPPC liposomes could only a play a minor role in DPPC liposome fusion.

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The thermal decomposition of silver permanganate

Cited by 107 publications

References 0 publications

The Oxidation of Carbon Monoxide by Solid Permanganate Reagents: Vii. Thermal Decomposition of Silver Permanganate

The Oxidation of Carbon Monoxide by Solid Permanganate Reagents: Vii. Thermal Decomposition of Silver Permanganate

The thermal decomposition of granular and fluid soybean lecithins

Interaction of Dipalmitoyl Phosphatidylcholine with n‐Hexadecanol in Monolayer and Liposome

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