Ozone

Kirschner, Mark J.

doi:10.1002/14356007.a18_349

Cited by 11 publications

(9 citation statements)

References 41 publications

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“…ArF excimer laser irradiation with oxygen (O 2 ); , gamma irradiation; UV radiation combined with ozone (O 3 ), ,,− air, or ammonia (NH 3 ); and vacuum-UV (VUV, 172 nm) with air are all alternative functionalization techniques that have been tested on polystyrene with success. Among these, treatments combining UV and O 3 (UV–ozone) are of interest because of design simplicity, operation close to ambient conditions, relative low cost, controllability, and generally harmless waste products, because ozone is a thermodynamically unstable precursor quickly reconverted to oxygen. However, the major drawback of UV–ozone treatments is that most of the functionalization does not last over time. ,, Functional group retention might be improved by replacing ozone with another chemical precursor that would be able to polymerize when exposed to UV light.…”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Surface Engineering of Polystyrene Beads Used to Challenge Automated Particle Inspection Systems

Labonté

Marion

Virgilio

2016

Ind. Eng. Chem. Res.

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Container challenge sets, used in the qualification and validation of automated visible particle inspection systems in the parenteral drug industry, are prepared by seeding a single standardized polystyrene-divinylbenzene (PS-DVB) bead inside the commercial product to mimic foreign particulates. Due to its low surface energy and wettability, the bead adheres to container walls, hindering its detection by the motion based inspection system. The aim of this research is to modify the surface properties of the bead in such a way that it repulses the inner walls and stays in suspension inside the liquid product. The surface treatment consists of a photoinduced chemical vapor deposition (PICVD) process using syngas and UVC light. Following 2 treatment, newly grafted C-OH, C-O-C, C=O and COOH functional groups on the bead's surface are observed by XPS and FTIR spectroscopy, leading to an increase in the surface energy from 31 ± 1 to 65 ± 2 mJ/m 2 , and a corresponding zeta potential decrease from -38 mV to -61 mV.Finally, treated 100 µm, 200 µm and 500 µm PS-DVB beads suspended in water exhibit higher dispersion stability over time than untreated beads. These results show the potential of syngas PICVD to provide an effective solution to the stability issue of containers challenge sets for the validation of automated particle inspection systems, enabling significant savings of time and money to the parenteral drug industry.

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Section: Introductionmentioning

confidence: 99%

Gas-Phase Surface Engineering of Polystyrene Beads Used to Challenge Automated Particle Inspection Systems

Labonté

Marion

Virgilio

2016

Ind. Eng. Chem. Res.

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“…In view of the high cost of noble metals, the metal oxide catalysts are usually preferred for ozone decomposition reactions. Catalyst supports include γ-Al 2 O 3 , SiO 2 , TiO 2 , zeolite, activated carbon (or carbon fibrous materials), or a combination of these. , …”

Section: Methodsmentioning

confidence: 99%

Catalytic Ozone Decomposition in a High Density Circulating Fluidized Bed Riser

Wang

et al. 2014

Ind. Eng. Chem. Res.

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Reactor performance of a high density circulating fluidized bed (CFB) riser is studied using ozone decomposition with extremely high solids circulation rates up to 800 kg/m 2 s and superficial gas velocities ranging from 5 to 9 m/s. Results show that the axial and radial distributions of the ozone concentration are consistent with those of the solids holdup. Higher solids flux and/or lower gas velocity lead to higher reaction conversion in the riser. Solids holdup is the dominant factor affecting reaction conversion. Effects of solids holdup on overall ozone conversion are more significant under high superficial gas velocity and/or low solids circulation rate. Overall conversion in the high density riser is not only less than that of plug flow reactor but also less than that of completely stirred tank reactor indicating that, due to the two-phase nature inside the riser, a CFB riser is still far from an ideal plug flow reactor.

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“…Industrial O2 production relies almost exclusively on air-separation processes 16,17 . One of these, PSA, is a cyclic chromatographic separation process 18 , which, in the last four decades, has steadily been displacing cryogenic distillation as the process of choice for O2 production, in an increasing number of conditions 16,17 .…”

Section: Introductionmentioning

confidence: 99%

“…One of these, PSA, is a cyclic chromatographic separation process 18 , which, in the last four decades, has steadily been displacing cryogenic distillation as the process of choice for O2 production, in an increasing number of conditions 16,17 . Presently, improvement of the process of air separation by PSA depends mainly on the development of new adsorbent materials, with greater working capacities 19,20 and selectivities; this is especially the case for O2, which is particularly hard to separate from Ar.…”

Section: Introductionmentioning

confidence: 99%

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Hydrophobic dipeptide crystals: a promising Ag-free class of ultramicroporous materials showing argon/oxygen adsorption selectivity

Afonso

Mendes

Gales

2014

Phys. Chem. Chem. Phys.

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The adsorption isotherms of nitrogen, oxygen and argon in four VA-class hydrophobic dipeptides are presented. Isotherms were determined at 5, 20 and 35 ºC, for a pressure range of 0-6 bar. Under these conditions, adsorption is still in the Henry region. For all materials and temperatures, the sequence of preferential adsorption is Ar>O2>N2, a highly abnormal result. At 5 ºC, the dipeptide with the smallest pores, VI, has Ar/O2 adsorption equilibrium selectivities up to 1.30, the highest ever measured in Ag -free adsorbents. Gas uptakes, at 1 bar and 20 ºC, are ~0.05 mol·kg -1 , very low relative values that are partially explained by the low porosity of the solids (< 10 %). The significance of these results for the development of new materials for the process of O2 generation by pressure swing adsorption (PSA) is discussed. The results indicate some of the structural and chemical properties that prospective Ag-free adsorbents should have in order to have Ar/O2 selectivity; hydrophobic pores, less than 0.5 nm-wide, and porosity of, at least, 20 %.

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Ozone

Abstract: The article contains sections titled: 1. Introduction 2. Physical Properties … Show more

Cited by 11 publications

References 41 publications

Gas-Phase Surface Engineering of Polystyrene Beads Used to Challenge Automated Particle Inspection Systems

Gas-Phase Surface Engineering of Polystyrene Beads Used to Challenge Automated Particle Inspection Systems

Catalytic Ozone Decomposition in a High Density Circulating Fluidized Bed Riser

Hydrophobic dipeptide crystals: a promising Ag-free class of ultramicroporous materials showing argon/oxygen adsorption selectivity

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