Shining light on CO2: from materials discovery to photocatalyst, photoreactor and process engineering

2020 ◽  
Vol 49 (16) ◽  
pp. 5648-5663 ◽  
Author(s):  
Yuchan Dong ◽  
Paul Duchesne ◽  
Abhinav Mohan ◽  
Kulbir Kaur Ghuman ◽  
Paul Kant ◽  
...  
Keyword(s):  
Gas Phase ◽  
Indium Oxide ◽  
Process Development ◽  
Process Engineering ◽  
Theoretical Modelling ◽  
Oxide Systems ◽  
Materials Engineering

Materials engineering, theoretical modelling, reactor engineering and process development of gas-phase photocatalytic CO2 reduction exemplified by indium oxide systems.

Generic Modular Operations for Virtual Manufacturing Process Engineering

1997 ◽  
Author(s):  
David E. Lee ◽  
H. Thomas Hahn
Keyword(s):  
Manufacturing Process ◽  
Process Development ◽  
Process Engineering ◽  
Virtual Manufacturing ◽  
Control Approach ◽  
Computational Costs ◽  
Direct Mechanism ◽  
Novel Approach ◽  
Operation Control ◽  
Virtual Process

Abstract In order to address the computational costs of modeling and analyzing manufacturing processes, a novel approach to virtual manufacturing process engineering using generic modular operations is presented. Relying on a state based representation of operation control for a simplified virtual manufacturing workcell, the valid states for each sequence of generic modular operations are aggregated and both operation state and processing constraints applied to specify the subtasks required to complete each step in a product’s process plan. By adopting this state based control approach, virtual process engineering provides a direct mechanism to map virtual process representations onto actualized processes. Using these generic modular operations and their temporal and processing dependencies, the computationally complex elements of virtual manufacturing process simulation can be directly identified and an architecture for virtual process development specified. Examples from both machining and assembly processes are provided.

Deposition of Ceramic Films by A Novel Pulsed-Gas Mocvd Technique

1992 ◽  
Vol 271 ◽  
Author(s):  
Kenneth A. Aitchison ◽  
James D. Barrie ◽  
Joseph Ciofalo
Keyword(s):  
Gas Phase ◽  
Film Growth ◽  
Flow Reactor ◽  
Substrate Surface ◽  
Chemical Vapor ◽  
Film Deposition ◽  
Organic Chemical ◽  
Oxide Systems ◽  
Metal Organic ◽  
Mocvd Technique

ABSTRACTMetal-Organic Chemical Vapor Deposition (MOCVD) is a versatile technique for the deposition of thin films of metals, semiconductors and ceramics. Commonly used hot wall flow-reactor designs suffer from a number of limitations. Chemical processes occurring in these reactors typically include a combination of homogeneous (gas-phase) and heterogeneous (gas-surface) reactions. These complex conditions are difficult to model and are poorly understood. In addition, flow reactors use large quantities of expensive precursor materials and are not well suited to the formation of abrupt interfaces. We report here a novel MOCVD technique which addresses these problems and enables a more thorough mechanistic understanding of the heterogeneous decomposition pathways of metal-organic compounds. This technique, the low-pressure pulsed gas method, has been demonstrated to provide high deposition rates with excellent control over film thickness. The deposition conditions effectively eliminate homogeneous processes allowing surface-mediated reactions to dominate. This decoupling of gas-phase chemistry from film deposition allows a better understanding of reaction mechanisms and provides better control over film growth. Both single metal oxides and binary oxide systems have been investigated on a variety of substrate materials. Effects of precursor chemistry, substrate surface, temperature and pressure on film composition and morphology will be discussed.

scholarly journals Models of hot molecular cores

1997 ◽  
Vol 178 ◽  
pp. 75-88 ◽  
Author(s):  
T.J. Millar
Keyword(s):  
Gas Phase ◽  
Theoretical Modelling ◽  
Specific Reference ◽  
Future Directions ◽  
Chemical Modelling

We review the properties of hot molecular cores with specific reference to chemical modelling. While most theoretical modelling has been generic, we discuss models for two specific sources, G34.3+0.15 and W3 (H2O). We show that the hot core gas in both these regions has an age of 5 103 — 104 yrs and that the abundances of many molecules are consistent with formation in the gas-phase following evaporation of simple molecular ices from the grains. We end with a discussion of current problems and future directions.

Electron Distribution in Partially Reduced Mixed Metal Oxide Systems: Infrared Spectroscopy of CemVnOo+Gas-Phase Clusters

2011 ◽  
Vol 115 (41) ◽  
pp. 11187-11192 ◽  
Author(s):  
Ling Jiang ◽  
Torsten Wende ◽  
Pieterjan Claes ◽  
Soumen Bhattacharyya ◽  
Marek Sierka ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Metal Oxide ◽  
Gas Phase ◽  
Electron Distribution ◽  
Mixed Metal Oxide ◽  
Oxide Systems ◽  
Mixed Metal ◽  
Gas Phase Clusters

scholarly journals The structure of chromophore-grafted amyloid-β12–28 dimers in the gas-phase: FRET-experiment guided modelling

2016 ◽  
Vol 18 (13) ◽  
pp. 9061-9069 ◽  
Author(s):  
Alexander Kulesza ◽  
Steven Daly ◽  
Chang Min Choi ◽  
Anne-Laure Simon ◽  
Fabien Chirot ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Amyloid Β ◽  
Theoretical Modelling

Theoretical modelling, ion mobility spectrometry and action-FRET experiments are combined to an experiment guided approach and used to elucidate the structure of chromophore-grafted amyloid-β12–28 dimers in the gas-phase.

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