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gas adsorption

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Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006107
EISBN: 978-1-62708-175-7
... Abstract This article focuses on the theory, advantages, and limitations of various methods used for the determination of surface area, density, and porosity of powder. These include gas adsorption, permeametry, pycnometry, and mercury porosimetry. Information on various equipment used...
Image
Published: 01 December 1998
Fig. 5 Effect of particle porosity on (a) green density and (b) green strength of solid and porous iron powders. Powders were pressed at 414 MPa (30 tsi) using die wall lubrication. The figures in parentheses in (a) signify specific surface areas (as measured by the gas adsorption method More
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001747
EISBN: 978-1-62708-178-8
... of the material, allowing each to recombine and form a more complex stable compound. The metallic elements will absorb atmospheric gases based on the affinity of the metal for each gas at various temperatures during the melt. Processed materials are again subject to gas adsorption as the material is initially...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006661
EISBN: 978-1-62708-213-6
... ). Ehrlich ( Ref 4 ) pioneered the so-called flash-desorption method as a means for studying the adsorption of gases such as N 2 , CO, and xenon on polycrystalline surfaces. Ehrlich exposed a clean polycrystalline filament to a flowing gas environment while rapidly flashing the filament at a high rate...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006659
EISBN: 978-1-62708-213-6
... (sample molecule and carrier gas) from the surface of the stationary phase. A quantity can be assigned to this amount of heat and is referred to as the enthalpy of adsorption, Δ H ads . A stationary phase must be selected so that the types of molecules to be separated have different adsorption...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001286
EISBN: 978-1-62708-170-2
... (<xref rid="a0001286-ref13" ref-type="bibr">Ref 13</xref>): In sputter deposition and ion plating ( Ref 13 ): Adsorption of inert and/or reactive gaseous species on the surface Gas scattering of vaporized particles Concurrent bombardment by high-energy particles, which can be from reflected high-energy neutrals from the sputtering...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003716
EISBN: 978-1-62708-182-5
... metals (Cr, Co) react relatively slowly. From the chemical point of view, the gas- metal reactions represent a broad class of heterogeneous reactions. The composition and structure of the scales produced on metals are a key factor in their behavior in technical applications. Historically, corrosion...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003229
EISBN: 978-1-62708-199-3
.... The tracer gas typically used is helium or krypton 85, and detection is by use of a helium mass spectrometer or a nuclear-radiation detector, respectively. Absolute values of the size of the leak sometimes are difficult to determine with back pressuring, because of (a) adsorption and absorption of the tracer...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003699
EISBN: 978-1-62708-182-5
..., electrostatic adsorption, and chemisorption. A more simplistic view of this mechanism of corrosion inhibitors can be described as controlled precipitation of the inhibitor from its environment (water and hydrocarbons) onto metal surfaces. A more recent view of the mechanism of oil/gas field corrosion inhibitors...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003052
EISBN: 978-1-62708-200-6
... a description of the comminution process (wet and dry milling methods), it discusses batching and mixing operations and granulation methods. The article also deals with the effect of process variables and the steps involved in chemical synthesis, including preparation from solution and gas-phase reactions...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006649
EISBN: 978-1-62708-213-6
... than a coarser powder. To determine the surface area of a powder, a physical adsorption method based on the Brunauer-Emmett-Teller (BET) equation is used, commonly through gas adsorption. The adsorptive gas, such as nitrogen gas, forms a monolayer molecule on all accessible particle surfaces...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005434
EISBN: 978-1-62708-196-2
.... Most of the elementary steps depicted in Fig. 1 for CVD are involved in PVD, except that there is usually no thermal activation of the vapor phase, that is, no gas-phase reactions and no (or few) chemically driven desorption or adsorption steps at the film surface. Hence, growth is mainly driven...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003169
EISBN: 978-1-62708-199-3
... as well as to bring the material up to drying temperature. Drying is conducted at temperatures close to the boiling point of water, which allows the use of low-quality fuels, such as hot combustion gases from other processes or cheap producer-gas fuel. Also, the low temperature used for the drying process...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002361
EISBN: 978-1-62708-193-1
... embrittlement appears to be divided into five types of mechanisms: Decohesion Pressure Adsorption Deformation Brittle hydride The balance between various phenomena is very difficult to sort out. Many researchers think that dissolution and hydrogen-induced cracking processes...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003698
EISBN: 978-1-62708-182-5
... by NACE International (formerly the National Association of Corrosion Engineers) is “a substance that retards corrosion when added to an environment in small concentrations” ( Ref 2 ). It is well established that inhibitors function in one or more ways to control corrosion: (a) by adsorption of a thin...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006096
EISBN: 978-1-62708-175-7
... subsieve sizer 0.2 ∼ 50 8 × 10 −3 to 2 Surface area Gas adsorption (BET) 0.01 ∼ 20 4 × 10 −4 to 0.08 BET, Brunauer-Emmett-Teller With these different methods, it is important to understand that measurement methods are based on different analytical models (see, for example, the grouping...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005551
EISBN: 978-1-62708-174-0
.... Mechanical joints can leak fluids unless special precautions are taken (e.g., gaskets, sealants, etc.). The labor intensity associated with mechanical fastening is high. Chemical Forces Chemical forces arise principally from surface adsorption between a chemical agent and the materials (i.e...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006065
EISBN: 978-1-62708-175-7
... of the particles. Powders atomized in air show a larger specific surface than inert gas-atomized powders due to the irregular shape. Figure 17 shows specific surface area of aluminum powders measured by the method of gas adsorption (BET). Fine air-atomized powders can have specific surface area values...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006375
EISBN: 978-1-62708-192-4
... Langmuir (1 × 10 –6 torr for 1000 s) of oxygen gas in vacuum at 1.33 × 10 –4 Pa. At completion of the exposure, the vacuum system was evacuated to 30 nPa or lower for the sliding friction experiments. The results indicated that the adsorption of an oxygen monolayer on argon sputter-cleaned metal...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005926
EISBN: 978-1-62708-166-5
...-based atmospheres, industrial gas nitrogen-base atmospheres, argon atmospheres, and hydrogen atmospheres. Atmospheres for backfilling, partial pressure operation, and quenching in vacuum are also discussed. Furnace atmospheres constitute four major groups of safety hazards in heat treating: fire...