Search

Your search keyword '"Gengenbach, Thomas R."' showing total 272 results
Start Over Author "Gengenbach, Thomas R."
272 results on '"Gengenbach, Thomas R."'

52. Proliferation of Faulty Materials Data Analysis in the Literature

Author

Linford, Matthew R., primary, Smentkowski, Vincent S., additional, Grant, John T., additional, Brundle, C. Richard, additional, Sherwood, Peter M.A., additional, Biesinger, Mark C., additional, Terry, Jeff, additional, Artyushkova, Kateryna, additional, Herrera-Gómez, Alberto, additional, Tougaard, Sven, additional, Skinner, William, additional, Pireaux, Jean-Jacques, additional, McConville, Christopher F., additional, Easton, Christopher D., additional, Gengenbach, Thomas R., additional, Major, George H., additional, Dietrich, Paul, additional, Thissen, Andreas, additional, Engelhard, Mark, additional, Powell, Cedric J., additional, Gaskell, Karen J., additional, and Baer, Donald R., additional

Published
2020
Full Text
View/download PDF

53. Enhancement of the intrinsic light harvesting capacity of Cs2AgBiBr6double perovskiteviamodification with sulphide

Author

Pai, Narendra, primary, Lu, Jianfeng, additional, Wang, Mingchao, additional, Chesman, Anthony S. R., additional, Seeber, Aaron, additional, Cherepanov, Pavel V., additional, Senevirathna, Dimuthu C., additional, Gengenbach, Thomas R., additional, Medhekar, Nikhil V., additional, Andrews, Philip C., additional, Bach, Udo, additional, and Simonov, Alexandr N., additional

Published
2020
Full Text
View/download PDF

55. Fiber with Butterfly Wings: Creating Colored Carbon Fibers with Increased Strength, Adhesion, and Reversible Malleability

Author

Eyckens, Daniel J., primary, Arnold, Chantelle L., additional, Randall, James D., additional, Stojcevski, Filip, additional, Hendlmeier, Andreas, additional, Stanfield, Melissa K., additional, Pinson, Jean, additional, Gengenbach, Thomas R., additional, Alexander, Richard, additional, Soulsby, Lachlan C., additional, Francis, Paul S., additional, and Henderson, Luke C., additional

Published
2019
Full Text
View/download PDF

60. Practical guides for x-ray photoelectron spectroscopy: Analysis of polymers.

Author

Easton, Christopher D., Kinnear, Calum, McArthur, Sally L., and Gengenbach, Thomas R.

Subjects
X-ray photoelectron spectroscopy, POLYMERS, DEPTH profiling, CHEMICAL sample preparation, INSULATING materials, PHOTOELECTRONS
Abstract

XPS is widely used to identify and quantify the elements present at the surface of polymeric materials. The energy distribution of photoelectrons emitted from these elements contains information about their chemical state, potentially allowing the analyst to identify and quantify specific functional groups. These functional groups may originate from the synthesis and processing of the polymers, from postsynthetic modifications such as surface grafting, or indeed may be unrelated to the polymer (additives and contaminants). Extracting reliable and meaningful information from XPS data is not trivial and relies on careful and appropriate experimentation, including experimental design, sample preparation, data collection, data processing, and data interpretation. Here, the authors outline some of these challenges when performing XPS analysis of polymers and provide practical examples to follow. This guide will cover all relevant aspects over the course of a typical experiment, including tips and considerations when designing the experiment, sample preparation, charge neutralization, x-ray induced sample damage, depth profiling, data analysis and interpretation, and, finally, reporting of results. Many of these topics are more widely applicable to insulating organic materials, and the recommendations of this guide will help to ensure that data is collected and interpreted using current best practices. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

61. Silver Bismuth Sulfoiodide Solar Cells: Tuning Optoelectronic Properties by Sulfide Modification for Enhanced Photovoltaic Performance

Author

Pai, Narendra, primary, Lu, Jianfeng, additional, Gengenbach, Thomas R., additional, Seeber, Aaron, additional, Chesman, Anthony S. R., additional, Jiang, Liangcong, additional, Senevirathna, Dimuthu C., additional, Andrews, Philip C., additional, Bach, Udo, additional, Cheng, Yi‐Bing, additional, and Simonov, Alexandr N., additional

Published
2018
Full Text
View/download PDF

62. An efficient high-throughput grafting procedure for enhancing carbon fiber-to-matrix interactions in composites

Author

Eyckens, Daniel J., primary, Stojcevski, Filip, additional, Hendlmeier, Andreas, additional, Arnold, Chantelle L., additional, Randall, James D., additional, Perus, Magenta D., additional, Servinis, Linden, additional, Gengenbach, Thomas R., additional, Demir, Baris, additional, Walsh, Tiffany R., additional, and Henderson, Luke C., additional

Published
2018
Full Text
View/download PDF

63. Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance

Author

Jalili, Rouhollah, primary, Esrafilzadeh, Dorna, additional, Aboutalebi, Seyed Hamed, additional, Sabri, Ylias M., additional, Kandjani, Ahmad E., additional, Bhargava, Suresh K., additional, Della Gaspera, Enrico, additional, Gengenbach, Thomas R., additional, Walker, Ashley, additional, Chao, Yunfeng, additional, Wang, Caiyun, additional, Alimadadi, Hossein, additional, Mitchell, David R. G., additional, Officer, David L., additional, MacFarlane, Douglas R., additional, and Wallace, Gordon G., additional

Published
2018
Full Text
View/download PDF

65. Silicon as a ubiquitous contaminant in graphene derivatives with significant impact on device performance

Author

Jalili, Rouhollah, Esrafilzadeh, Dorna, Aboutalebi, Seyed Hamed, Sabri, Ylias M, Kandjani, Ahmad E, Bhargava, Suresh K, Della Gaspera, Enrico, Gengenbach, Thomas R, Walker, Ashley, Chao, Yunfeng, Wang, Caiyun, Alimadadi, Hossein, Mitchell, David R. G, Officer, David L, MacFarlane, Douglas R, Wallace, Gordon G, Jalili, Rouhollah, Esrafilzadeh, Dorna, Aboutalebi, Seyed Hamed, Sabri, Ylias M, Kandjani, Ahmad E, Bhargava, Suresh K, Della Gaspera, Enrico, Gengenbach, Thomas R, Walker, Ashley, Chao, Yunfeng, Wang, Caiyun, Alimadadi, Hossein, Mitchell, David R. G, Officer, David L, MacFarlane, Douglas R, and Wallace, Gordon G

Abstract

Silicon-based impurities are ubiquitous in natural graphite. However, their role as a contaminant in exfoliated graphene and their influence on devices have been overlooked. Herein atomic resolution microscopy is used to highlight the existence of silicon-based contamination on various solution-processed graphene. We found these impurities are extremely persistent and thus utilising high purity graphite as a precursor is the only route to produce silicon-free graphene. These impurities are found to hamper the effective utilisation of graphene in whereby surface area is of paramount importance. When non-contaminated graphene is used to fabricate supercapacitor microelectrodes, a capacitance value closest to the predicted theoretical capacitance for graphene is obtained. We also demonstrate a versatile humidity sensor made from pure graphene oxide which achieves the highest sensitivity and the lowest limit of detection ever reported. Our findings constitute a vital milestone to achieve commercially viable and high performance graphene-based devices.

Published
2018

66. An efficient high-throughput grafting procedure for enhancing carbon fiber-to-matrix interactions in composites

Author

Eyckens, Daniel J., Stojcevski, Filip, Hendlmeier, Andreas, Arnold, Chantelle L., Randall, James D., Perus, Magenta D., Servinis, Linden, Gengenbach, Thomas R., Demir, Baris, Walsh, Tiffany R., Henderson, Luke C., Eyckens, Daniel J., Stojcevski, Filip, Hendlmeier, Andreas, Arnold, Chantelle L., Randall, James D., Perus, Magenta D., Servinis, Linden, Gengenbach, Thomas R., Demir, Baris, Walsh, Tiffany R., and Henderson, Luke C.

Published
2018

68. Thiol surface functionalization via continuous phase plasma polymerization of allyl mercaptan, with subsequent maleimide-linked conjugation of collagen

Author

Stynes, Gil D., Gengenbach, Thomas R., Kiroff, George K., Morrison, Wayne A., and Kirkland, Mark A.

Subjects
plasma chemistry, thiol, biological activity, protein engineering, surface analysis
Abstract

Thiol groups can undergo a large variety of chemical reactions and are used in solution phase to conjugate many bioactive molecules. Previous research on solid substrates with continuous phase glow discharge polymerization of thiol-containing monomers may have been compromised by oxidation. Thiol surface functionalization via glow discharge polymerization has been reported as requiring pulsing. Herein, continuous phase glow discharge polymerization of allyl mercaptan (2-propene-1-thiol) was used to generate significant densities of thiol groups on a mixed macrodiol polyurethane and tantalum. Three general classes of chemistry are used to conjugate proteins to thiol groups, with maleimide linkers being used most commonly. Here the pH specificity of maleimide reactions was used effectively to conjugate surface-bound thiol groups to amine groups in collagen. XPS demonstrated surface-bound thiol groups without evidence of oxidation, along with the subsequent presence of maleimide and collagen. Glow discharge reactor parameters were optimized by testing the resistance of bound collagen to degradation by 8 M urea. The nature of the chemical bonding of collagen to surface thiol groups was effectively assessed by colorimetric assay (ELISA) of residual collagen after incubation in 8 M urea over 8 days and after incubation with keratinocytes over 15 days. The facile creation of useable solid-supported thiol groups via continuous phase glow discharge polymerization of allyl mercaptan opens a route for attaching a vast array of bioactive molecules.

Published
2017

72. Enhancement of the intrinsic light harvesting capacity of Cs2AgBiBr6 double perovskite via modification with sulphide.

Author

Pai, Narendra, Lu, Jianfeng, Wang, Mingchao, Chesman, Anthony S. R., Seeber, Aaron, Cherepanov, Pavel V., Senevirathna, Dimuthu C., Gengenbach, Thomas R., Medhekar, Nikhil V., Andrews, Philip C., Bach, Udo, and Simonov, Alexandr N.

Abstract

Caesium silver bismuth halide double perovskites, in the first instance Cs2AgBiBr6, were recently introduced to the field of emerging photovoltaics as environmentally friendly, non-toxic and thermodynamically stable photoabsorber materials. However, the wide indirect bandgaps of these materials indicate the need for bandgap engineering and enhancing the light absorption to improve the photovoltaic performance. The present work demonstrates that this can be achieved via modification of the double perovskite with sulphide to obtain caesium silver bismuth sulphobromide materials, Cs2AgBiBr6−2xSx, which have been synthesised as pin-hole-free uniform films and systematically investigated herein. Notable enhancements in the intrinsic light absorption for 0 ≤ x ≤ 0.2 are demonstrated, as are the improvements by up to 50% in the photocurrent density of the corresponding thin-film solar cells. The devices based on the films with the nominal composition Cs2AgBiBr5.8S0.1 delivered a short-circuit current density of 3.0 ± 0.3 mA cm−2 and a power conversion efficiency of 1.9 ± 0.1% (cf. 2.1 ± 0.2 mA cm−2 and 1.3 ± 0.1%, respectively, for the control cells based on the sulphide-free Cs2AgBiBr6). Equally important, caesium silver bismuth sulphobromides demonstrate excellent stability against all common environmental stimuli, viz. heat, light, and humidity. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

74. Robust Sub-Monolayers of Co₃O₄ Nano-Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis

Author

Liu, Guanyu, Karuturi, Siva Krishna, Simonov, Alexandr N, Fekete, Monika, Chen, Hongjun, Nasiri, Noushin, Le, Nhien H, Reddy Narangari, Parvathala, Lysevych, Mykhaylo, Gengenbach, Thomas R, Lowe, Adrian, Tan, Hark Hoe, Jagadish, Chennupati, Spiccia, Leone, Tricoli, Antonio, Liu, Guanyu, Karuturi, Siva Krishna, Simonov, Alexandr N, Fekete, Monika, Chen, Hongjun, Nasiri, Noushin, Le, Nhien H, Reddy Narangari, Parvathala, Lysevych, Mykhaylo, Gengenbach, Thomas R, Lowe, Adrian, Tan, Hark Hoe, Jagadish, Chennupati, Spiccia, Leone, and Tricoli, Antonio

Abstract

The scalable synthesis of highly transparent and robust sub-monolayers of Co₃O₄ nano-islands, which efficiently catalyze water oxidation, is reported. Rapid aerosol deposition of Co₃O₄ nanoparticles and thermally induced self-organization lead to an ultra-fine nano-island morphology with more than 94% light transmission at a wavelength of 500 nm. These transparent sub-monolayers demonstrate a remarkable mass-weighted water oxidation activity of 2070–2350 A gCo₃O₄ ⁻¹ and per-metal turnover frequency of 0.38–0.62 s⁻¹ at an overpotential of 400 mV in 1 m NaOH aqueous solution. This mixed valent cobalt oxide structure exhibits excellent long-term electrochemical and mechanical stability preserving the initial catalytic activity over more than 12 h of constant current electrolysis and 1000 consecutive voltammetric cycles. The potential of the Co₃O₄ nano-islands for photoelectrochemical water splitting has been demonstrated by incorporation of co-catalysts in GaN nanowire photoanodes. The Co₃O₄-GaN photoanodes reveal significantly reduced onset overpotentials, improved photoresponse and photostability compared to the bare GaN ones. These findings provide a highly performing catalyst structure and a scalable synthesis method for the engineering of efficient photoanodes for integrated solar water-splitting cells.

Published
2016

75. Robust Sub‐Monolayers of Co 3 O 4 Nano‐Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis

Author

Liu, Guanyu, primary, Karuturi, Siva Krishna, additional, Simonov, Alexandr N., additional, Fekete, Monika, additional, Chen, Hongjun, additional, Nasiri, Noushin, additional, Le, Nhien H., additional, Reddy Narangari, Parvathala, additional, Lysevych, Mykhaylo, additional, Gengenbach, Thomas R., additional, Lowe, Adrian, additional, Tan, Hark Hoe, additional, Jagadish, Chennupati, additional, Spiccia, Leone, additional, and Tricoli, Antonio, additional

Published
2016
Full Text
View/download PDF

77. Morphology and surface properties of high strength siloxane poly(urethane‐urea)s developed for heart valve application.

Author

Dandeniyage, Loshini S., Adhikari, Raju, Bown, Mark, Shanks, Robert, Adhikari, Benu, Easton, Christopher D., Gengenbach, Thomas R., Cookson, David, and Gunatillake, Pathiraja A.

Abstract

A series of siloxane poly(urethane‐urea) (SiPUU) were developed by incorporating a macrodiol linked with a diisocyanate to enhance mixing of hard and soft segments (SS). The effect of this modification on morphology, surface properties, surface elemental composition, and creep resistance was investigated. The linked macrodiol was prepared by reacting α,ω‐bis(6‐hydroxyethoxypropyl) poly(dimethylsiloxane)(PDMS) or poly(hexamethylene oxide) (PHMO) with either 4,4′‐methylenediphenyl diisocyanate (MDI), hexamethylene diisocyanate (HDI), or isophorone diisocyanate (IPDI). SiPUU with PHMO‐MDI‐PHMO and PHMO‐IPDI‐PHMO linked macrodiols showed enhanced creep resistance and recovery when compared with a commercial biostable polyurethane, Elast‐Eon™ 2A. Small and wide‐angle X‐ray scattering data were consistent with significant increase of hydrogen bonding between hard and SS with linked‐macrodiols, which improved SiPUU's tensile stress and tear strengths. These SiPUU were hydrophobic with contact angle higher than 101° and they had low water uptake (0.7%·w/w of dry mass). They also had much higher siloxane concentration on the surface compared to that in the bulk. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 107B: 112–121, 2019. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

78. Methanol-water co-electrolysis for sustainable hydrogen production with PtRu/C-SnO2 electro-catalyst.

Author

Ju, HyungKuk, Giddey, Sarbjit, Badwal, Sukhvinder P. S., Mulder, Roger J., and Gengenbach, Thomas R.

Abstract

Hydrogen at present is mainly produced from fossil fuels for use in ammonia synthesis, the petrochemical industry, and chemical production. In the future, hydrogen will be increasingly used as an energy vector. Although water electrolysis to produce hydrogen with renewable electricity offers a clean process, the approach is energy intensive, requiring a large renewable resource footprint. Methanol-water co-electrolysis can reduce the energy input by > 50%; its electrochemical oxidation poses complex issues such as poisoning of the catalyst, sluggish oxidation kinetics, and degradation over time. The addition of nano-sized SnO2 to PtRu/C catalyst, to reduce noble metal loading, has been shown here to reduce catalyst leaching and increase the chemical, micro-structural, and performance stability of the methanol-water co-electrolysis process during extended periods of testing. The electrochemical characterization, analysis of the methanol solution, and exit gases, post-cell testing, revealed complete oxidation of methanol with little performance degradation. This is further supported by the stability of the catalyst composition and structure as revealed by the post-mortem XRD and XPS analysis of the cell. The energy balance calculations show that methanol-water co-electrolysis can significantly reduce the renewable energy footprint, and the process can become carbon neutral if bio-methanol is used with renewable electricity. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

86. Azide photochemistry for facile modification of graphitic surfaces : preparation of DNA-coated carbon nanotubes for biosensing

Author

Moghaddam, Minoo J., Yang, Wenrong, Bojarski, Barbara, Gengenbach, Thomas R., Gao, Mei, Zareie, Hai, McCall, Maxine J., Moghaddam, Minoo J., Yang, Wenrong, Bojarski, Barbara, Gengenbach, Thomas R., Gao, Mei, Zareie, Hai, and McCall, Maxine J.

Abstract

A facile, two-step method for chemically attaching single-stranded DNA to graphitic surfaces, represented here by carbon nanotubes, is reported. In the first step, an azide-containing compound, N-5-azido-nitrobenzoyloxy succinimide (ANB-NOS), is used to form photo-adducts on the graphitic surfaces in a solid-state photochemical reaction, resulting in active ester groups being oriented for the subsequent reactions. In the second step, pre-synthesized DNA strands bearing a terminal amine group are coupled in an aqueous solution with the active esters on the photo-adducts. The versatility of the method is demonstrated by attaching pre-synthesized DNA to surfaces of carbon nanotubes in two platforms—as vertically-aligned multi-walled carbon nanotubes on a solid support and as tangled single-walled carbon nanotubes in mats. The reaction products at various stages were characterized by x-ray photoelectron spectroscopy. Two different assays were used to check that the DNA strands attached to the carbon nanotubes were able to bind their partner strands with complementary base sequences. The first assay, using partner DNA strands tethered to gold nanoparticles, enabled the sites of DNA attachment to the carbon nanotubes to be identified in TEM images. The second assay, using radioactively labelled partner DNA strands, quantified the density of functional DNA strands attached to the carbon nanotubes. The diversity of potential applications for these DNA-modified carbon-nanotube platforms is exemplified here by the successful use of a DNA-modified single-walled carbon-nanotube mat as an electrode for the specific detection of metal ions.

Published
2012

88. Robust Sub-Monolayers of Co3O4 Nano-Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis.

Author

Liu, Guanyu, Karuturi, Siva Krishna, Simonov, Alexandr N., Fekete, Monika, Chen, Hongjun, Nasiri, Noushin, Le, Nhien H., Reddy Narangari, Parvathala, Lysevych, Mykhaylo, Gengenbach, Thomas R., Lowe, Adrian, Tan, Hark Hoe, Jagadish, Chennupati, Spiccia, Leone, and Tricoli, Antonio

Subjects
MONOMOLECULAR films, OXIDATION of water, CATALYSIS, CHEMISTRY, NANOSTRUCTURED materials
Abstract

The scalable synthesis of highly transparent and robust sub-monolayers of Co3O4 nano-islands, which efficiently catalyze water oxidation, is reported. Rapid aerosol deposition of Co3O4 nanoparticles and thermally induced self-organization lead to an ultra-fine nano-island morphology with more than 94% light transmission at a wavelength of 500 nm. These transparent sub-monolayers demonstrate a remarkable mass-weighted water oxidation activity of 2070-2350 A gCo3O4−1 and per-metal turnover frequency of 0.38-0.62 s−1 at an overpotential of 400 mV in 1 m NaOH aqueous solution. This mixed valent cobalt oxide structure exhibits excellent long-term electrochemical and mechanical stability preserving the initial catalytic activity over more than 12 h of constant current electrolysis and 1000 consecutive voltammetric cycles. The potential of the Co3O4 nano-islands for photoelectrochemical water splitting has been demonstrated by incorporation of co-catalysts in GaN nanowire photoanodes. The Co3O4-GaN photoanodes reveal significantly reduced onset overpotentials, improved photoresponse and photostability compared to the bare GaN ones. These findings provide a highly performing catalyst structure and a scalable synthesis method for the engineering of efficient photoanodes for integrated solar water-splitting cells. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

90. Layer-by-layer deposition of chitosan nanoparticles as drug-release coatings for PCL nanofibersElectronic supplementary information (ESI) available. See DOI: 10.1039/c8bm00657a

Author

Sydow, Steffen, de Cassan, Dominik, Hänsch, Robert, Gengenbach, Thomas R., Easton, Christopher D., Thissen, Helmut, and Menzel, Henning

Abstract

Nanogels were prepared by ionotropic gelation of chitosan (CS) with tripolyphosphate (TPP). The use of such nanogels to prepare coatings by layer-by-layer deposition (LbL) was studied. The nanogels were characterized in terms of particle size, zeta-potential and stability. Nanogel suspensions were used to build polyelectrolyte multilayers on silicon wafers and on PCL fiber mats by LbL-deposition. Three different polysaccharides were used as polyanions, namely chondroitin sulfate, alginate and hyaluronic acid. The ellipsometric thickness was demonstrated to depend significantly on the type of polyanion. XPS analysis with depth profiling further substantiated the differences in the chemical composition of the films with the different polyanions. Furthermore, XPS data clearly indicated a strong penetration of the polyanions into the CS-TPP layer, resulting in a complete exchange and release of the TPP ions. The LbL-deposition also was studied with PCL fiber mats, which were modified with a chitosan-PCL-graft polymer and alginate. The possibility to create graded coatings on the fiber mats was shown employing fluorescently labelled CS–TPP nanoparticles. The potential of the coatings as drug delivery system for therapeutic proteins was exemplified with the release of Transforming Growth Factor β3(TGF-β3). The CS–TPP nanogels were shown to encapsulate and release therapeutic proteins. In combination with the layer-by-layer deposition they will allow the creation of PCL fiber mat implants having with drug gradients for applications at tissue transitions.

Published
2018
Full Text
View/download PDF

92. One-Step Method for Generating PEG-Like Plasma Polymer Gradients: Chemical Characterization and Analysis of Protein Interactions

Author

Menzies, Donna J., primary, Cowie, Bruce, additional, Fong, Celesta, additional, Forsythe, John S., additional, Gengenbach, Thomas R., additional, McLean, Keith M., additional, Puskar, Ljiljana, additional, Textor, Marcus, additional, Thomsen, Lars, additional, Tobin, Mark, additional, and Muir, Benjamin W., additional

Published
2010
Full Text
View/download PDF

96. Investigation of the capacity decay of a CdO–NaI mixed sorbent for pre-combustion CO2 capture.

Author

Vogt, Christian, Gengenbach, Thomas R., Chang, Shery L. Y., Knowles, Gregory P., and Chaffee, Alan L.

Abstract

The mechanisms for the loss of both CO2 working capacity and mass from a CdO–NaI composite were investigated to better assess the potential use of the material to facilitate the pre-combustion capture of CO2 from syngas. Fresh activated material was used to analyse sorption and desorption using a CO2–N2 mixture. Mass spectrometric analysis of the exit gas revealed the loss of elemental iodine from the system over the period, attributed to the oxidation of iodide. Thermogravimetric analysis using iodine vapour suggested the iodide loss reaction to be a partially reversible equilibrium. X-ray photoelectron spectroscopy revealed the formation of a highly oxidised iodine species on the surface of the sorbent during initial calcination in both air and N2, but this compound vanished after the use of the sorbent in 25 CO2 sorption cycles. Elemental mapping showed that iodine was dislocated from the sodium, which it was considered to be originally associated to, supporting the theory of oxidation and evaporation (and possible re-deposition). Transmission electron microscopy revealed that the sorbent consisted of regular, spherical nanoparticles of approx. 250 nm diameter, which became more irregularly-shaped after CO2 sorption cycles, considered to be due to void/crack formation caused by density changes upon calcination and carbonation. In situ powder X-ray diffraction revealed an increase in crystallinity of both CdO and NaI upon heating to CO2 sorption temperature of 325 °C in N2 atmosphere, compared to room temperature. If the oxidation of the iodide promoter can be inhibited, this is likely to improve the multicyclic CO2 sorption stability of this material for future use. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results