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Your search keyword '"Christopher D. J."' showing total 10 results
Start Over Author "Christopher D. J." Publisher royal society of chemistry
10 results on '"Christopher D. J."'

1. Three dimensional nanoscale analysis reveals aperiodic mesopores in a covalent organic framework and conjugated microporous polymer

Author

Stoppiello, Craig T., Isla, Helena, Fay, Michael W., Parmenter, Christopher D. J., Roe, Martin J., Mateo-Alonso, Aurelio, and Khlobystov, Andrei N.

Subjects
General Materials Science
Abstract

The integrated analytical approach developed in this study offers a powerful methodology for the structural characterization of complex molecular nanomaterials. Structures of a covalent organic framework based on boronate esters (COF-5) and a conjugated microporous polymer (Aza-CMP) have been investigated by a combination of several electron microscopy techniques elucidating the three-dimensional topology of the complex polycrystalline (COF) and non-crystalline (CMP) materials. Unexpected, aperiodic mesoporous channels of 20-50 nm in diameter were found to be penetrating the COF and CMP particles, which cannot be detected by X-ray diffraction techniques. The mesopores appear to be stable under a range of different conditions and accessible to gas molecules, exhibiting a particular bonding capability with CO2 in the case of the CMP. The mesoporosity appears to be unrelated to the intrinsic chemical structures of the COF or CMP but rather it reflects the dynamics of polymer particle formation in a polycondensation reaction. The mesopores may be templated by clusters of solvent molecules during the COF or CMP synthesis, leaving cavities within the polymer particles. The unexpected mesoporosity discovered in COF and CMP materials begs for re-assessment of the nature of framework materials and may open new opportunities for applications of these molecular materials in gas sorption or catalysis.

Published
2019

2. Three Dimensional Nanoscale Analysis Reveals Aperiodic Mesopores in a Covalent Organic Framework and Conjugated Microporous Polymer

Author

Química aplicada, Kimika aplikatua, Stoppiello, Craig T., Isla, Helena, Martínez Abadía, Marta, Fay, Michael W., Parmenter, Christopher D. J., Roe, Martin J., Lerma Berlanga, Belén, Martí Gastaldo, Carlos, Mateo Alonso, Aurelio, Khlobystov, Andrei N., Química aplicada, Kimika aplikatua, Stoppiello, Craig T., Isla, Helena, Martínez Abadía, Marta, Fay, Michael W., Parmenter, Christopher D. J., Roe, Martin J., Lerma Berlanga, Belén, Martí Gastaldo, Carlos, Mateo Alonso, Aurelio, and Khlobystov, Andrei N.

Abstract

The integrated analytical approach developed in this study offers a powerful methodology for the structural characterisation of complex molecular nanomaterials. Structures of a covalent organic framework based on boronate esters (COF-5) and a conjugated microporous polymer (Aza-CMP) have been investigated by a combination of several electron microscopy techniques elucidating the three-dimensional topology of the complex polycrystalline (COF) and non-crystalline (CMP) materials. Unexpected, aperiodic mesoporous channels of 20-50 nm in diameter were found to be penetrating the COF and CMP particles, which cannot be detected by X-ray diffraction techniques. The mesopores appear to be stable under a range of different conditions and accessible to gas molecules, exhibiting a particular bonding capability with CO2 in the case of the CMP. The mesoporosity is unrelated to the intrinsic chemical structures of the COF or CMP but rather it reflects the mechanisms of polymer particle formation in a polycondensation reaction. The mesopores may be templated by clusters of solvent molecules during the COF or CMP synthesis, leaving cavities within the polymer particles. The unexpected mesoporosity discovered in COF and CMP materials begs for re-assessment of the nature of framework materials and may open new opportunities for applications of these molecular materials in gas sorption or catalysis.

Published
2019

3. A comprehensive comparison of dye-sensitized NiO photocathodes for solar energy conversion

Author

Summers, Gareth H., Clark, Charlotte A., Kaeffer, Nicolas, Braeutigam, Maximilian, Carbone, Lea Roberta, D'Amario, Luca, Fan, Ke, Stevens, Lee A., Parmenter, Christopher D. J., Fay, Michael W., La Torre, Alessandro, Snape, Colin E., Dietzek, Benjamin, Dini, Danilo, Pellegrin, Yann, Odobel, Fabrice, Sun, Licheng, Artero, Vincent, Gibson, Elizabeth A., and Wood, Christopher J.

Published
2016

4. A comprehensive comparison of dye-sensitized NiO photocathodes for solar energy conversion.

Author

Wood, Christopher J., Summers, Gareth H., Clark, Charlotte A., Kaeffer, Nicolas, Braeutigam, Maximilian, Carbone, Lea Roberta, D'Amario, Luca, Fan, Ke, Farré, Yoann, Narbey, Stéphanie, Oswald, Frédéric, Stevens, Lee A., Parmenter, Christopher D. J., Fay, Michael W., La Torre, Alessandro, Snape, Colin E., Dietzek, Benjamin, Dini, Danilo, Hammarström, Leif, and Pellegrin, Yann

Abstract

We investigated a range of different mesoporous NiO electrodes prepared by different research groups and private firms in Europe to determine the parameters which influence good quality photoelectrochemical devices. This benchmarking study aims to solve some of the discrepancies in the literature regarding the performance of p-DSCs due to differences in the quality of the device fabrication. The information obtained will lay the foundation for future photocatalytic systems based on sensitized NiO so that new dyes and catalysts can be tested with a standardized material. The textural and electrochemical properties of the semiconducting material are key to the performance of photocathodes. We found that both commercial and non-commercial NiO gave promising solar cell and water-splitting devices. The NiO samples which had the two highest solar cell efficiency (0.145% and 0.089%) also gave the best overall theoretical H2 conversion. [ABSTRACT FROM AUTHOR]

Published
2016
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5. Manganese(ii) and copper(ii) nitrate bis-imidazole coordination polymers: dimensionality and product morphology.

Author

Richards, Victoria J., Blake, Alexander J., Lewis, William, Nowell, Harriott, Parmenter, Christopher D. J., and Champness, Neil R.

Subjects
IMIDAZOLES, COORDINATION polymers, MANGANESE, COPPER, X-ray diffraction, ISOMERS
Abstract

The reaction of a bis-imidazole ligand, N,N′-bis(3-(1-imidazolyl)propyl)-1,4,5,8-naphthalene-tetracarboxylicdiimide (BIPNDI), with either Mn(NO3)2 or Cu(NO3)2 affords coordination polymers of formula {[Mn(BIPNDI)3](NO3)2}∞ or [M(BIPNDI)2(NO3)2]∞ (M = Mn or Cu). Single crystal X-ray diffraction studies confirm the structures of supramolecular isomers of {[Mn(BIPNDI)3](NO3)2}∞ (1,2), both of which contain two-dimensional coordination polymer sheets, and a one-dimensional coordination polymer [Mn(BIPNDI)2(NO3)2]∞ (3). Reaction of either Mn(NO3)2 or Cu(NO3)2 with BIPNDI exploiting rapid precipitation affords sub-micron coordination particles of either rod-shaped (4, Mn) or spherical (5, Cu) morphology depending on the metal salt used. SEM and DLS studies were used to probe the morphology and solution behaviour of the coordination particles. Spectroscopic investigations indicate that the rod-shaped, Mn-based particles comprise two-dimensional coordination polymers in contrast to the spherical, Cu-based particles which are composed of one-dimensional coordination polymers. [ABSTRACT FROM AUTHOR]

Published
2013
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10. Multivariate analysis of 3D ToF-SIMS images: method validation and application to cultured neuronal networks

Author

Mischa Zelzer, Noah A. Russell, Christopher D. J. Parmenter, S. Van Nuffel, and David J. Scurr

Subjects
Validation study, Multivariate analysis, INFORMATION, ION MASS-SPECTROMETRY, Analytical chemistry, Spectrometry, Mass, Secondary Ion, 02 engineering and technology, Signal-To-Noise Ratio, FILMS, 01 natural sciences, Biochemistry, Analytical Chemistry, Imaging, Three-Dimensional, Electrochemistry, Environmental Chemistry, Animals, Spectroscopy, Cultured neuronal network, Cells, Cultured, Neurons, Principal Component Analysis, Training set, Chemistry, business.industry, 010401 analytical chemistry, Pattern recognition, 021001 nanoscience & nanotechnology, Sample (graphics), 0104 chemical sciences, 3. Good health, Rats, Signal-to-noise ratio (imaging), CELLS, Principal component analysis, Multivariate Analysis, Artificial intelligence, Analysis tools, Nerve Net, 0210 nano-technology, business
Abstract

Advanced data analysis tools are crucial for the application of ToF-SIMS analysis to biological samples. Here, we demonstrate that by using a training set approach principal components analysis (PCA) can be performed on large 3D ToF-SIMS images of neuronal cell cultures. The method readily provides access to sample component information and significantly improves the images' signal-to-noise ratio (SNR).

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