Investigation of Duplex Brass Membranes with Metallography, Permeability and Treatments: Work-Hardening, Annealing and Quenching

This paper consists of the fabrication and investigation of metal membranes and the study of their behaviour and applications in gas separation processes. The scope is to produce and characterize the porous crystal structure of brass alloy (standardization: DIN 17660) membranes and measure their permeability with helium as a penetrant medium. Another part of this study is to alter the brass alloy’s structure throughout metallurgical treatments and investigate how the permeability is allied to the structure’s alteration. This work merges the knowledge and technology of inorganic porous materials science in metallurgy. The novelty of the current research resides in the process to alternate the brass alloy structure throughout metallurgical treatments and how it is allied to the permeability of the membrane, which is of interest to be investigated. The results of the research are analysed and compared conducting the final inferences. All metallurgical treatments resulted in low permeability values when compared to a non-treated specimen. Specifically, the drop in permeance ranged from 76 up to 99.56%. It is noted that consecutive treatments contributed to even further decreases.

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A SEM/TEM examination of a ceramic membrane

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144802 ◽

1986 ◽

Vol 44 ◽

pp. 682-683

Author(s):

C.E. Voegele-Kliewer ◽

A.D. McMaster ◽

G.W. Dirks

Keyword(s):

Electron Microscopy ◽

Gas Separation ◽

Ceramic Membrane ◽

Hydrogen Iodide ◽

Separation Processes ◽

Corning Glass ◽

Gas Transport Properties ◽

Porous Microstructure ◽

Microscopy Techniques ◽

The Relationship

Materials other than polymers, e.g. ceramic silicates, are currently being investigated for gas separation processes. The permeation characteristics of one such material, Vycor (Corning Glass #1370), have been reported for the separation of hydrogen from hydrogen iodide. This paper will describe the electron microscopy techniques applied to reveal the porous microstructure of a Vycor membrane. The application of these techniques has led to an increased understanding in the relationship between the substructure and the gas transport properties of this material.

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Raman Sensor for the Determination of Gas Solubility

Physchem ◽

10.3390/physchem1020012 ◽

2021 ◽

Vol 1 (2) ◽

pp. 176-188

Author(s):

Gregor Lipinski ◽

Markus Richter

Keyword(s):

Carbon Dioxide ◽

Gas Separation ◽

Accurate Determination ◽

Measurement Techniques ◽

Screening Tools ◽

Measuring System ◽

Separation Processes ◽

Use Of Resources ◽

Gas Solubilities

Efficient and environmentally responsible use of resources requires the development and optimization of gas separation processes. A promising approach is the use of liquids that are designed for specific tasks, e.g., the capture of carbon dioxide or other greenhouse gases. This requires an accurate determination of gas solubilities for a broad range of temperatures and pressures. However, state of the art measurement techniques are often very time consuming or exhibit other pitfalls that prevent their use as efficient screening tools. Here, we show that the application of Raman spectroscopy through a compact measuring system can simplify data acquisition for the determination of gas solubilities in liquids. To demonstrate that this approach is expedient, we determined gas solubilities of carbon dioxide in water for three isotherms T = (288.15, 293.15, 298.15) K over a pressure range from p = (0.5–5) MPa and in three imidazolium-based ionic liquids for one isotherm T = 298.15 K at pressures from p = (0.1–5) MPa. When compared to data in the literature, all results are within the reported uncertainties of the measurement techniques involved. The developed analysis method eliminates the need for a lengthy volume or mass calibration of the sample prior to the measurements and, therefore, allows for fast screening of samples, which can help to advance gas separation processes in scientific and industrial applications.

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Symmetry-general ab initio computation of physical properties using quantum software integrated with crystal structure databases: results and perspectives

Acta Crystallographica Section B Structural Science ◽

10.1107/s0108768102002422 ◽

2002 ◽

Vol 58 (3) ◽

pp. 349-357 ◽

Cited By ~ 8

Author(s):

Yvon Le Page ◽

Paul W. Saxe ◽

John R. Rodgers

Keyword(s):

Crystal Structure ◽

Physical Properties ◽

Ab Initio ◽

Materials Science ◽

Science Research ◽

Elastic Tensor ◽

Pure Phase ◽

Simulation And Experiment ◽

Structure Databases ◽

Using Data

The timely integration of crystal structure databases, such as CRYSTMET, ICSD etc., with quantum software, like VASP, OresteS, ElectrA etc., allows ab initio cell and structure optimization on existing pure-phase compounds to be performed seamlessly with just a few mouse clicks. Application to the optimization of rough structure models, and possibly new atomic arrangements, is detailed. The ability to reproduce observed cell data can lead to an assessment of the intrinsic plausibility of a structure model, even without a competing model. The accuracy of optimized atom positions is analogous to that from routine powder studies. Recently, the ab initio symmetry-general least-squares extraction of the coefficients of the elastic tensor for pure-phase materials using data from corresponding entries in crystal structure databases was automated. A selection of highly encouraging results is presented, stressing the complementarity of simulation and experiment. Additional physical properties also appear to be computable using existing quantum software under the guidance of an automation scheme designed following the above automation for the elastic tensor. This possibility creates the exciting perspective of mining crystal structure databases for new materials with combinations of physical properties that were never measured before. Crystal structure databases can accordingly be expected to become the cornerstone of materials science research within a very few years, adding immense practical value to the archived structure data.

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Metal-Organic Framework Based Membranes for Gas Separation Processes

Procedia Engineering ◽

10.1016/j.proeng.2012.09.019 ◽

2012 ◽

Vol 44 ◽

pp. 1991-1992

Author(s):

L.A. Neves ◽

N. Barreto ◽

J.C. Crespo ◽

I.M. Coelhoso

Keyword(s):

Gas Separation ◽

Metal Organic Framework ◽

Separation Processes ◽

Metal Organic ◽

Organic Framework

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Evolution of materials science. The crystal structure now central to drug product development

Acta Crystallographica Section A Foundations and Advances ◽

10.1107/s2053273318092793 ◽

2018 ◽

Vol 74 (a2) ◽

pp. e164-e164

Author(s):

Patricia Basford

Keyword(s):

Crystal Structure ◽

Product Development ◽

Materials Science ◽

Drug Product

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A radical polymer for highly efficient solar evaporation and gas separation

10.21203/rs.3.rs-516120/v1 ◽

2021 ◽

Author(s):

Wei Liu ◽

Ming Yang ◽

Jing Liu ◽

Meijia Yang ◽

Jing Li ◽

...

Keyword(s):

Gas Separation ◽

Membrane Separation ◽

Hydrogen Separation ◽

Solar Irradiation ◽

Separation Processes ◽

Highly Efficient ◽

Separation Membranes ◽

Gas Separation Membranes ◽

Transport Channels ◽

The Impact

Abstract The unique magnetic, electronic and optical features derived from their unpaired electrons have made radical polymers an attractive material platform for various applications. Here, we report solution-processable radical polymer membranes with multi-level porosities and study the impact of free radicals on important membrane separation processes including solar vapor generation, hydrogen separation and CO2 capture. The radical polymer is a supreme light absorber over the full solar irradiation range with sufficient water transport channels, leading to a highly efficient solar evaporation membrane. In addition, the radical polymer with micropores and adjustable functional groups are broad-spectrum gas separation membranes for both hydrogen separation and CO2 capture. First principle calculations indicate that the conjugated polymeric network bearing radicals is more chemically reactive with CO2, compared with H2, N2 and CH4. This is evidenced by a high CO2 permeability in gas separation membranes made of the conjugated radical polymer.

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