Search

Your search keyword '"McKeown, Neil"' showing total 822 results
Start Over Author "McKeown, Neil"
822 results on '"McKeown, Neil"'

101. Photoelectroanalytical Oxygen Detection with Titanate Nanosheet – Platinum Hybrids Immobilised into a Polymer of Intrinsic Microporosity (PIM‐1)

Author

Fan, Bingbing, primary, Zhao, Yuanzhu, additional, Putra, Budi Riza, additional, Harito, Christian, additional, Bavykin, Dmitry, additional, Walsh, Frank C., additional, Carta, Mariolino, additional, Malpass‐Evans, Richard, additional, McKeown, Neil B., additional, and Marken, Frank, additional

Published
2020
Full Text
View/download PDF

111. Sulfonated Microporous Polymer Membranes with Fast and Selective Ion Transport for Electrochemical Energy Conversion and Storage

Author

Zuo, Peipei, primary, Li, Yuanyuan, additional, Wang, Anqi, additional, Tan, Rui, additional, Liu, Yahua, additional, Liang, Xian, additional, Sheng, Fangmeng, additional, Tang, Gonggen, additional, Ge, Liang, additional, Wu, Liang, additional, Song, Qilei, additional, McKeown, Neil B., additional, Yang, Zhengjin, additional, and Xu, Tongwen, additional

Published
2020
Full Text
View/download PDF

112. Tailoring molecular interactions between microporous polymers in high performance mixed matrix membranes for gas separations

Author

Lau, Cher Hon, primary, Konstas, Kristina, additional, Doherty, Cara M., additional, Smith, Stefan J. D., additional, Hou, Rujing, additional, Wang, Huanting, additional, Carta, Mariolino, additional, Yoon, Heewook, additional, Park, Jaesung, additional, Freeman, Benny D., additional, Malpass-Evans, Richard, additional, Lasseuguette, Elsa, additional, Ferrari, Maria-Chiara, additional, McKeown, Neil B., additional, and Hill, Matthew R., additional

Published
2020
Full Text
View/download PDF

114. Author Correction: Hydrophilic microporous membranes for selective ion separation and flow-battery energy storage

Author

Tan, Rui, primary, Wang, Anqi, additional, Malpass-Evans, Richard, additional, Williams, Rhodri, additional, Zhao, Evan Wenbo, additional, Liu, Tao, additional, Ye, Chunchun, additional, Zhou, Xiaoqun, additional, Darwich, Barbara Primera, additional, Fan, Zhiyu, additional, Turcani, Lukas, additional, Jackson, Edward, additional, Chen, Linjiang, additional, Chong, Samantha Y., additional, Li, Tao, additional, Jelfs, Kim E., additional, Cooper, Andrew I., additional, Brandon, Nigel P., additional, Grey, Clare P., additional, McKeown, Neil B., additional, and Song, Qilei, additional

Published
2019
Full Text
View/download PDF

116. Hydrophilic microporous membranes for selective ion separation and flow-battery energy storage

Author

Tan, Rui, primary, Wang, Anqi, additional, Malpass-Evans, Richard, additional, Williams, Rhodri, additional, Zhao, Evan Wenbo, additional, Liu, Tao, additional, Ye, Chunchun, additional, Zhou, Xiaoqun, additional, Darwich, Barbara Primera, additional, Fan, Zhiyu, additional, Turcani, Lukas, additional, Jackson, Edward, additional, Chen, Linjiang, additional, Chong, Samantha Y., additional, Li, Tao, additional, Jelfs, Kim E., additional, Cooper, Andrew I., additional, Brandon, Nigel P., additional, Grey, Clare P., additional, McKeown, Neil B., additional, and Song, Qilei, additional

Published
2019
Full Text
View/download PDF

117. Correlating Gas Permeability and Young’s Modulus during the Physical Aging of Polymers of Intrinsic Microporosity Using Atomic Force Microscopy

Author

Longo, Mariagiulia, primary, De Santo, Maria Penelope, additional, Esposito, Elisa, additional, Fuoco, Alessio, additional, Monteleone, Marcello, additional, Giorno, Lidietta, additional, Comesaña-Gándara, Bibiana, additional, Chen, Jie, additional, Bezzu, C. Grazia, additional, Carta, Mariolino, additional, Rose, Ian, additional, McKeown, Neil B., additional, and Jansen, Johannes C., additional

Published
2019
Full Text
View/download PDF

119. Size‐Selective Photoelectrochemical Reactions in Microporous Environments: Clark Probe Investigation of Pt@g‐C3N4 Embedded into Intrinsically Microporous Polymer (PIM‐1).

Author

Zhao, Yuanzhu, Malpass‐Evans, Richard, Carta, Mariolino, McKeown, Neil B., Fletcher, Philip J., Kociok‐Köhn, Gabriele, Lednitzky, Diana, and Marken, Frank

Subjects
POLYMERS, HYDROGEN detectors, HYDROGEN production, IMPRINTED polymers, OXYGEN reduction, SACCHARIDES
Abstract

Graphitic carbon nitride (g‐C3N4) with photo‐attached platinum (Pt@g‐C3N4) is known to generate hydrogen under illumination in aqueous environments in the presence of carbohydrate hole quenchers. Here, Pt@g‐C3N4 is embedded into a polymer of intrinsic microporosity (PIM‐1) host material with a molecularly rigid structure to maintain active unblocked catalyst surfaces and to control transport to/from the photocatalyst. A Clark‐type oxygen/hydrogen sensor is employed with Pt@g‐C3N4 embedded into PIM‐1 applied as a film to be the gas‐permeable sensor membrane. Oxygen reduction and hydrogen production are observed in situ as a function of light exposure and quencher concentration. Significant size‐selectivity favouring smaller more flexible saccharides or carbohydrate/ hydrocarbon quenchers is observed and attributed to rate limiting PIM‐1 micropore transport. Effective hydrogen production through a Teflon membrane is demonstrated. The underlying hydrogen production/ photocurrent enhancing effects of the microporous PIM‐1 film on the photochemical process are revealed. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

125. Towards High Performance MOF - Microporous Polymer Mixed Matrix Membranes: Addressing Compatibility and Limiting Aging via Polymer Doping

Author

Sabetghadam, Anahid, Liu, Xinlei, Orsi, Angelica, Lozinska, Magdalena, Johnson, Timothy, Jansen, Kaspar, Wright, Paul, Carta, Mariolino, Mckeown, Neil, Kapteijn, Freek, and Gascon, Jorge

Abstract

Membrane separation for gas purification is an energy-efficient and environment-friendly technology. However, the development of high performance membranes is still a great challenge. In principle, mixed matrix membranes (MMMs) have the potential to overcome current materials limitations, but in practice there is no straightforward method to match the properties of fillers and polymers (the main components of MMMs) in such a way that the final membrane performance reflects the high performance of themicroporous filler and the processability of the continuous polymer phase. This issue is especially important when high flux polymers are utilized. In this work, we demonstrate that the use of small amounts of a glassy polymer in combination with high performance PIM-1 allow for the preparation of MOF based MMMs with superior separation properties and low aging rates under humid conditions, meeting the commercial target for post-combustion CO2 capture.

Published
2018

126. Triphasic nature of polymers of intrinsic microporosity (PIM-1 and PIM-PY) induces storage and catalysis effects in hydrogen and oxygen reactivity at electrode surfaces

Author

Madrid, Elena, Lowe, David John, Msayib, Kadhum J, Mckeown, Neil, Song, Qilei, Attard, Gary A., Duren, Tina, and Marken, Frank

Subjects
voltammetry, Science & Technology, ADSORPTION, diffusion, carbon dioxide, CARBONIZATION, EVOLUTION, CAPTURE, CARBON-DIOXIDE, METHANE, DESIGN, hemic and lymphatic diseases, modified electrode, Physical Sciences, Electrochemistry, electrocatalysis, FILM
Abstract

Hydrogen oxidation and oxygen reduction are two crucial energy conversion reactions, which are shown to be both strongly affected by the presence of intrinsically microporous polymer coatings on electrodes. Polymers of intrinsic microporosity (PIMs) are known to possess extremely high internal surface area and ability to bind gases under dry conditions. It is shown here that both, hydrogen‐ and oxygen gas binding into PIMs, also occurs under wet or “triphasic” conditions in aqueous electrolyte environments (when immersed in 0.01 M phosphate buffer at pH 7). For two known PIM materials (PIM‐1 and PIM‐PY), nanoparticles are formed by an anti‐solvent precipitation protocol and then cast as a film onto platinum or glassy carbon electrodes. Voltammetry experiments reveal evidence for hydrogen and oxygen binding. Both, PIM‐1 and PIM‐PY, locally store hydrogen or oxygen gas at the electrode surface and thereby significantly affect electrocatalytic reactivity. The onset of oxygen reduction on glassy carbon is shifted by 0.15 V in the positive direction.

Published
2018

129. Effect of Backbone Rigidity on the Glass Transition of Polymers of Intrinsic Microporosity Probed by Fast Scanning Calorimetry

Author

Yin, Huajie, primary, Yang, Bin, additional, Chua, Yeong Zen, additional, Szymoniak, Paulina, additional, Carta, Mariolino, additional, Malpass-Evans, Richard, additional, McKeown, Neil B., additional, Harrison, Wayne J., additional, Budd, Peter M., additional, Schick, Christoph, additional, Böhning, Martin, additional, and Schönhals, Andreas, additional

Published
2019
Full Text
View/download PDF

130. Charge Transfer Hybrids of Graphene Oxide and the Intrinsically Microporous Polymer PIM-1

Author

Rong, Yuanyang, primary, Large, Matthew J., additional, Tripathi, Manoj, additional, Ogilvie, Sean P., additional, Amorim Graf, Aline, additional, Mao, Boyang, additional, Tunesi, Jacob, additional, Salvage, Jonathan P., additional, King, Alice A. K., additional, Pasquazi, Alessia, additional, Peccianti, Marco, additional, Malpass-Evans, Richard, additional, McKeown, Neil B., additional, Marken, Frank, additional, and Dalton, Alan B., additional

Published
2019
Full Text
View/download PDF

132. The fabrication of ultrathin films and their gas separation performance from polymers of intrinsic microporosity with two-dimensional (2D) and three-dimensional (3D) chain conformations

Author

Benito, Javier, primary, Vidal, Julio, additional, Sánchez-Laínez, Javier, additional, Zornoza, Beatriz, additional, Téllez, Carlos, additional, Martín, Santiago, additional, Msayib, Kadhum J., additional, Comesaña-Gándara, Bibiana, additional, McKeown, Neil B., additional, Coronas, Joaquín, additional, and Gascón, Ignacio, additional

Published
2019
Full Text
View/download PDF

133. Redefining the Robeson upper bounds for CO2/CH4 and CO2/N2 separations using a series of ultrapermeable benzotriptycene-based polymers of intrinsic microporosity

Author

Comesaña-Gándara, Bibiana, primary, Chen, Jie, additional, Bezzu, C. Grazia, additional, Carta, Mariolino, additional, Rose, Ian, additional, Ferrari, Maria-Chiara, additional, Esposito, Elisa, additional, Fuoco, Alessio, additional, Jansen, Johannes C., additional, and McKeown, Neil B., additional

Published
2019
Full Text
View/download PDF

135. Gas sorption in polymers of intrinsic microporosity: The difference between solubility coefficients determined via time-lag and direct sorption experiments

Author

Lanč, Marek, primary, Pilnáček, Kryštof, additional, Mason, Christopher R., additional, Budd, Peter M., additional, Rogan, Yulia, additional, Malpass-Evans, Richard, additional, Carta, Mariolino, additional, Gándara, Bibiana Comesaña, additional, McKeown, Neil B., additional, Jansen, Johannes C., additional, Vopička, Ondřej, additional, and Friess, Karel, additional

Published
2019
Full Text
View/download PDF

136. Out of the blue

Author

McKeown, Neil B.

Subjects
Phthalocyanins -- Usage, Business, Chemicals, plastics and rubber industries
Published
1999

143. A Novel Time Lag Method for the Analysis of Mixed Gas Diffusion in Polymeric Membranes by On-Line Mass Spectrometry: Pressure Dependence of Transport Parameters

Author

Monteleone, Marcello, primary, Esposito, Elisa, additional, Fuoco, Alessio, additional, Lanč, Marek, additional, Pilnáček, Kryštof, additional, Friess, Karel, additional, Bezzu, Caterina, additional, Carta, Mariolino, additional, McKeown, Neil, additional, and Jansen, Johannes, additional

Published
2018
Full Text
View/download PDF

147. The immobilisation and reactivity of Fe(CN)63−/4− in an intrinsically microporous polyamine (PIM-EA-TB).

Author

Wang, Lina, Malpass-Evans, Richard, Carta, Mariolino, McKeown, Neil B., and Marken, Frank

Subjects
PRUSSIAN blue, MICROPOROSITY, CARBON electrodes, VITAMIN C, PROTON transfer reactions, COORDINATION polymers, AQUEOUS solutions
Abstract

Protonation of the molecularly rigid polymer of intrinsic microporosity PIM-EA-TB can be coupled to immobilisation of Fe(CN)63−/4− (as well as immobilisation of Prussian blue) into 1–2 nm diameter channels. The resulting films provide redox-active coatings on glassy carbon electrodes. Uptake, transport, and retention of Fe(CN)63−/4− in the microporous polymer are strongly pH dependent requiring protonation of the PIM-EA-TB (pKA ≈ 4). Both Fe(CN)64− and Fe(CN)63− can be immobilised, but Fe(CN)64− appears to bind tighter to the polymer backbone presumably via bridging protons. Loss of Fe(CN)63−/4− by leaching into the aqueous solution phase becomes significant only at pH > 9 and is likely to be associated with hydroxide anions directly entering the microporous structure to combine with protons. This and the interaction of Fe(CN)63−/4− and protons within the molecularly rigid PIM-EA-TB host are suggested to be responsible for retention and relatively slow leaching processes. Electrocatalysis with immobilised Fe(CN)63−/4− is demonstrated for the oxidation of ascorbic acid. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

148. Carbonization of Polymers of Intrinsic Microporosity to Microporous Heterocarbon: Capacitive pH Measurements

Author

McKeown, Neil, Malpass-Evans, Richard, Hernandez, Naiara, Iniesta, Jesus, Montiel Leguey, Vincente, Armsyrong, Robert, Taylor, Stuart H, Madrid, Elena, Rong, Yuanyang, Castaing, Remi, Marken, Frank, Universidad de Alicante. Departamento de Química Física, Universidad de Alicante. Instituto Universitario de Electroquímica, and Electroquímica Aplicada y Electrocatálisis

Subjects
Materials science, 02 engineering and technology, Electrolyte, Conformal carbonization, 010402 general chemistry, Electrochemistry, 01 natural sciences, Capacitance, Adsorption, Materials Science(all), Organic chemistry, Micropore hydration, General Materials Science, Química Física, chemistry.chemical_classification, Heterocarbon, Aqueous solution, Carbonization, pH sensing, Microporous material, Polymer, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Chemical engineering, chemistry, Voltammetry, 0210 nano-technology
Abstract

A nitrogen-containing polymer of intrinsic microporosity (PIM-EA-TB-H2; nitrogen adsorption surface area 846 m2 g−1) is vacuum carbonized at 700 °C and thereby directly without post-treatment converted into a microporous heterocarbon (cPIM; N2 adsorption surface area 425 m2 g−1). Nitrogen functionalities in the polymer backbone are retained in the heterocarbon and appear responsible for unusual time-, electrolyte-, and pH-dependent properties. Electrochemical characterization suggests a high specific capacitance (typically 50 F g−1) but only after prolonged immersion in aqueous HClO4. The time-dependent increase in capacitance during immersion is assigned to slow hydration and ingress of HClO4 into hydrophobic micropores (H2SO4 or H3PO4 are more hydrophilic and much less effective). Once hydrated, the microporous heterocarbon exhibits pH-dependent capacitance “switching” over a wide pH range and analytical applications as “capacitive” pH sensor are proposed. N.H. and J.I. thank MINICINN, Spain (projects CTQ2013-48280-C3-3-R and CTQ2016-76231-C2-2-R) for financial support and the University of Alicante for support for a PhD exchange visit. F.M. and N.B.M. thank the Leverhulme Foundation for financial support (RPG-2014-308: “New Materials for Ionic Diodes and Ionic Photodiodes”).

Published
2017

149. The Synthesis of Polymers of Intrinsic Microporosity (PIMs

Author

McKeown, Neil

Subjects
hemic and lymphatic diseases
Abstract

Polymers of Intrinsic Microporosity (PIMs) are a class of Porous Organic Polymer (POP) that form microporous solids due to the inefficient packing of their rigid and contorted macromolecular chains. In contrast to other types of POP, PIMs are not comprised of a network of cross-linked covalent bondsso that they can be dissolved in organic solvents and processed into robust films, coatings or fibres. Here, over twelve years accumulated research on the synthesis of PIMs is reviewed. To date, three types of polymerisation reaction have been used successfully to prepare PIMs of sufficient molecular mass to form robust self-standing films. These involve the formation of (i) dibenzodioxin, (ii) Tröger’s base and (iii) imide linkages between mon-omeric units. This rapid development of synthetic methods for preparing PIMs has been driven by their rich potential for numerous diverse applications and this synergistic relationship between synthesis and functionality is set to continue.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results