THERMAL DESORPTION OF INERT GASES FROM TUNGSTEN MONOCRYSTALS

1966 ◽  
Vol 9 (3) ◽  
pp. 112-114 ◽  
Author(s):  
E. V. Kornelsen ◽  
M. K. Sinha
Keyword(s):  
Thermal Desorption ◽  
Inert Gases

scholarly journals Overview of sorption analysis capabilities for meso- and microporous zeolites nanomaterials

2021 ◽  
Vol 8 (3) ◽  
pp. 20210302
Author(s):  
S. Tokmeilova ◽  
E. V. Maraeva
Keyword(s):  
Sample Preparation ◽  
Thermal Desorption ◽  
Microporous Materials ◽  
Inert Gases ◽  
Stable Operation ◽  
Main Application ◽  
Preparation Mode ◽  
Desorption Method

In this paper we consider the main application features of the thermal desorption method of inert gases, implemented on the Sorbi MS (Meta, Russia) device, for the analysis of meso- and microporous materials. Recommendations on the choice of measurement modes for stable operation of the Sorbi MS device are offered (including recommendations on mass, sample preparation mode). The article presents the results of the micropores analysis by the t-plot and Sing method.

Thermal analysis of pyridine-treated sepiolite and palygorskite

Clay Minerals ◽  
1991 ◽  
Vol 26 (4) ◽  
pp. 497-506 ◽  
Author(s):  
U. Shuali ◽  
S. Yariv ◽  
M. Steinberg ◽  
M. Müller-Vonmoos ◽  
G. Kahr ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Organic Matter ◽  
Thermal Desorption ◽  
Bound Water ◽  
Inert Gases ◽  
Carbon Oxidation ◽  
Organic Base ◽  
Air Oxidation ◽  
Evolved Gases ◽  
Dta Curve

AbstractThe thermal behaviour of sepiolite and palygorskite treated with pyridine (Py) was investigated by DTA, TG, DTG and EGA (by MS) under a flow of air and inert gases (N2 or Ar). The thermal analysis showed that the organic base was adsorbed by the clays, penetrating into the clay pores and replacing zeolitic and bound water. Its presence in the pores shifted the dehydroxylation peak to temperatures higher than the corresponding peak in the untreated clays. Under N2 and Ar, thermal desorption of Py from sepiolite was observed at 260 and 650°C whereas for palygorskite only traces of Py were detected in the evolved gases. In addition to desorption, reactions of pyrolysis and condensation to coke were detected by the evolution of ammonia, methane and hydrogen, respectively. In air, oxidation of the organic matter led to the appearance of exothermic peaks. The profile of the DTA curve and the temperatures of the most intense exothermic peaks were determined by the rate of the carbon oxidation.

THE IONIC ENTRAPMENT AND THERMAL DESORPTION OF INERT GASES IN TUNGSTEN FOR KINETIC ENERGIES OF 40 EV TO 5 KEV

1964 ◽  
Vol 42 (2) ◽  
pp. 364-381 ◽  
Author(s):  
E. V. Kornelsen
Keyword(s):  
Energy Range ◽  
Metal Surface ◽  
Atomic Number ◽  
Thermal Desorption ◽  
Tungsten Wire ◽  
Incident Energy ◽  
Inert Gases ◽  
Kcal Mole ◽  
Ion Energies ◽  
Sticking Probabilities

A clean polycrystalline tungsten wire was bombarded with monoenergetic ions of neon, argon, krypton, and xenon in the energy range 40 ev to 5 kev. The gas trapped in the tungsten was desorbed by then heating the wire to 2400 °K at 66 °K/second. Ion sticking probabilities determined from the quantities of gas desorbed ranged from ~0.6 for all gases at 3 kev to <10−5 at ion energies (ev) ~4 times the ion atomic number. From the variation of the desorption rates with temperature, six activation energies of thermal desorption were found which were not dependent on the ion or its incident energy. The lowest four (33 to 63 kcal/mole) are believed to be associated with gas trapped within a few atom layers of the metal surface, and the highest (102 kcal/mole) with normal impurity diffusion in the bulk tungsten.

MEASUREMENT OF BLOOD FLOW WITH FREELY DIFFUSIBLE INDICATORS AS INERT GASES, ANTIPYRINE, LABELLED WATER AND RUBIDIUM

1972 ◽  
Vol 68 (2_Supplb) ◽  
pp. S95-S111 ◽  
Author(s):  
Niels A. Lassen ◽  
Ole Andrée Larsen
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Capillary Wall ◽  
Inert Gases ◽  
Tissue Blood Flow ◽  
Blood Flow Measurement

ABSTRACT Indicators which freely cross the capillary wall can be used for measurement of tissue blood flow in many different ways. Basically one can distinguish two categories of methods, viz. the ones where the indicator enters the tissue via the inflowing blood and the ones where the indicator is deposited locally in the tissue. The most important methods are briefly described with special emphasis on the theory of blood flow measurement.

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