Aging kinetics on silver-functionalized silica aerogel in off-gas streams including dry air, humid air, NO and NO2

This manuscript elucidates the mechanism responsible for a decrease of iodine-sorption performance for Ag0-functionalized silica aerogel in the reprocessing off-gas streams.

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Tungsten Oxide Based Sensor for Oxygen Detection

Proceedings ◽

10.3390/proceedings2130952 ◽

2018 ◽

Vol 2 (13) ◽

pp. 952 ◽

Cited By ~ 3

Author(s):

Wangi Sari ◽

Simon Leigh ◽

James Covington

Keyword(s):

Metal Oxide ◽

Linear Relationship ◽

Tungsten Oxide ◽

Spin Coating ◽

Low Temperatures ◽

Oxygen Sensor ◽

High Response ◽

Humid Air ◽

Dry Air ◽

Oxygen Detection

In this paper we report on the development tungsten oxide based chemiresistive sensors for the monitoring of oxygen at low temperatures (T ≤ 400 °C) in dry and humid air. The sensors were deposited onto alumina substrate by a combination of spin coating and a photolithographic process to define the sensing area. Our results show that the sensors comply with a linear relationship over a 0 to 20% concentration range, with a high response towards oxygen. The highest response was observed at 350 °C (ΔR/Ra = 7.8) in humid and in dry air (ΔR/Ra = 18). This result is a significant improvement over our previous experiments and we believe to take the concept of a metal-oxide based oxygen sensor a step closer.

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Adsorption of Methyl Iodide on Reduced Silver‐Functionalized Silica Aerogel: Kinetics and Modeling

AIChE Journal ◽

10.1002/aic.17137 ◽

2020 ◽

Author(s):

Siqi Tang ◽

Seungrag Choi ◽

Yue Nan ◽

Lawrence L. Tavlarides

Keyword(s):

Methyl Iodide ◽

Silica Aerogel ◽

Functionalized Silica

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Fabrication of silica aerogel and carbon–silica composite for dynamic adsorption of benzene from dry and wet gas streams

International Journal of Environmental & Analytical Chemistry ◽

10.1080/03067319.2021.1982921 ◽

2021 ◽

pp. 1-19

Author(s):

Mohammadreza Alipour ◽

Vinod Kumar Gupta ◽

Mohamadreza Massoudinejad ◽

Siamak Motahari ◽

Saeed Motesaddi Zarandi

Keyword(s):

Silica Aerogel ◽

Dynamic Adsorption ◽

Gas Streams ◽

Silica Composite ◽

Wet Gas

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Nasal Mucosal Temperature after Exposure to Cold, Dry Air and Hot, Humid Air

Acta Oto-Laryngologica ◽

10.1080/00016480310000601a ◽

2003 ◽

Vol 123 (7) ◽

pp. 851-856 ◽

Cited By ~ 19

Author(s):

Kristina Liener ◽

Richard Leiacker ◽

Jörg Lidemann ◽

Gerhard Rettinger ◽

Tilman Keck

Keyword(s):

Humid Air ◽

Dry Air ◽

Exposure To Cold

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Methyl Iodide Adsorption on Reduced Silver-Functionalized Silica Aerogel: How Temperature Impacts the Adsorption?

10.22541/au.162206839.94974132/v1 ◽

2021 ◽

Author(s):

Siqi Tang ◽

Seungrag Choi ◽

Lawrence Tavlarides

Keyword(s):

Methyl Iodide ◽

Photoelectron Spectroscopy ◽

Silica Aerogel ◽

Reaction Rate ◽

Reaction Pathway ◽

Effect Of Temperature ◽

Functionalized Silica ◽

Contributing Factors ◽

X Ray ◽

Temperature Impacts

To understand the effect of temperature to the adsorption, 104 ppbv and 1044 ppbv methyl iodide (CHI) adsorptions on reduced silver-functionalized silica aerogel (Ag-Aerogel) at 100, 150 and 200 ℃ were performed. In the experiments, a significantly high uptake rate (3 – 4 times higher than that at 100 and 150 ℃) was observed for the 104 ppbv adsorption at 200 ℃. To explain such behavior, a potential reaction pathway was proposed and multiple physical analyses including nitrogen titration, x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were performed. Based on the results, the contributing factors appear to be the formation of different Ag-I components induced by temperature, higher silver site availability, decreasing diffusion limitation, and increasing reaction rate described by the Arrhenius relationship.

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Oxidation Characteristics of Vapor-Plated Tungsten

CORROSION ◽

10.5006/0010-9312-22.10.291 ◽

1966 ◽

Vol 22 (10) ◽

pp. 291-293 ◽

Cited By ~ 1

Author(s):

VERNON A. NIEBERLEIN

Keyword(s):

Powder Metallurgy ◽

Vapor Deposition ◽

Oxidation Kinetics ◽

Activation Energies ◽

Humid Air ◽

Dry Air ◽

Oxidation Rates ◽

Complex Shapes ◽

Oxidation Characteristics

Abstract Vapor-deposition is being used increasingly for fabricating complex shapes from tungsten. In contrast to conventional tungsten whose oxidation kinetics have been well explored, vapor-deposited material has never been investigated systematically with regard to oxidation. Oxidation rates were run at 600–1000 C (1112–1832 F) in air using a recording balance. Activation energies were calculated and oxidation rates were compared to those of sheet tungsten prepared using powder metallurgy techniques. Humid air and dry air were compared as corroding media.

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Effect of cold and warm dry air hyperventilation on canine airway blood flow

Journal of Applied Physiology ◽

10.1152/jappl.1987.62.2.526 ◽

1987 ◽

Vol 62 (2) ◽

pp. 526-532 ◽

Cited By ~ 44

Author(s):

E. M. Baile ◽

R. W. Dahlby ◽

B. R. Wiggs ◽

G. H. Parsons ◽

P. D. Pare

Keyword(s):

Blood Flow ◽

Left Lung ◽

Tissue Temperature ◽

Humid Air ◽

Dry Air ◽

Airway Mucosa ◽

Anesthetized Dogs ◽

Tracheal Tissue ◽

Group 2 ◽

Central Airway

Tracheobronchial blood flow increases with cold air hyperventilation in the dog. The present study was designed to determine whether the cooling or the drying of the airway mucosa was the principal stimulus for this response. Six anesthetized dogs (group 1) were subjected to four periods of eucapnic hyperventilation for 30 min with warm humid air [100% relative humidity (rh)], cold dry air (-12 degrees C, 0% rh), warm humid air, and warm dry air (43 degrees C, 0% rh). Five minutes before the end of each period of hyperventilation, tracheal and central airway blood flow was determined using four differently labeled 15-micron diam radioactive microspheres. We studied another three dogs (group 2) in which 15- and 50-micron microspheres were injected simultaneously to determine whether there were any arteriovenous communications in the bronchovasculature greater than 15 micron diam. After the last measurements had been made, all dogs were killed, and the lungs, including the trachea, were excised and blood flow to the trachea, left lung bronchi, and parenchyma was calculated. Warm dry air hyperventilation produced a consistently greater increase in tracheobronchial blood flow (P less than 0.01) than cold dry air hyperventilation, despite the fact that there was a smaller fall (6 degrees C) in tracheal tissue temperature during warm dry air hyperventilation than during cold dry air hyperventilation (11 degrees C), suggesting that drying may be a more important stimulus than cold for increasing airway blood flow. In group 2, the 15-micron microspheres accurately reflected the distribution of airway blood flow but did not always give reliable measurements of parenchymal blood flow.

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Effect of autonomic blockade on tracheobronchial blood flow

Journal of Applied Physiology ◽

10.1152/jappl.1987.62.2.520 ◽

1987 ◽

Vol 62 (2) ◽

pp. 520-525 ◽

Cited By ~ 9

Author(s):

E. M. Baile ◽

S. Osborne ◽

P. D. Pare

Keyword(s):

Blood Flow ◽

Blood Gases ◽

Lung Parenchyma ◽

Beta Blockade ◽

Humid Air ◽

Dry Air ◽

Arterial Blood ◽

Autonomic Blockade ◽

Alpha Blockade ◽

Group 2

Tracheobronchial blood flow increases two to five times in response to cold and warm dry air hyperventilation in anesthetized tracheostomized dogs. In this series of experiments we have attempted to attenuate this increase by blockade of the autonomic nervous system. Four groups of anesthetized, tracheostomized, open-chest dogs were studied. Group 1 (n = 5) were hyperventilated for 30 min with 1) warm humid [approximately 26 degrees C, 100% relative humidity, (rh)] air followed by bilateral vagotomy, 2) warm humid air, 3) cold (-22 degrees C, 0% rh) dry air, and 4) warm humid air. Groups 2, 3, and 4 (n = 3/group) were hyperventilated for 30 min with 1) warm humid (approximately 41 degrees C, 100% rh) air, 2) warm dry (approximately 41 degrees C) air, 3) warm humid air, and 4) warm dry air. Group 2 were controls. Group 3 were given phentolamine, 0.6 mg/kg intravenously, as an alpha-blockade, and group 4 were given propranolol, 1 mg/kg, as a beta-blockade after warm dry air hyperventilation (period 2). Five minutes before the end of each 30-min period of hyperventilation, measurements of vascular pressures, cardiac output, arterial blood gases, and inspired, body, and tracheal temperatures were measured, and differently labeled radioactive microspheres were injected into the left atrium to make separate measurements of airway blood flow. After the last measurements had been made animals were killed and their lungs were excised. Blood flow to the airways and lung parenchyma was calculated.(ABSTRACT TRUNCATED AT 250 WORDS)

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