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Imaging immunoassay in negative: Surface-­‐catalysed chemiluminescence for the detection of pregnancy hormones in artificial saliva (2018)
Journal Article
Wright, K. J., Oiaidha, Z. O., Love, D. P., Aljohani, M., Greenway, G. M., & Wadhawan, J. D. (2018). Imaging immunoassay in negative: Surface-­‐catalysed chemiluminescence for the detection of pregnancy hormones in artificial saliva. New journal of chemistry = Nouveau journal de chimie, 42(23), 18641-18648. doi:10.1039/c8nj02974a

A novel and rapid (45min), quantitative chemiluminescence-based, surface immunoassay is reported for the quantitative detection of progesterone and œstriol in artificial saliva. The detection limits for these pregnancy hormones are 2.3 and 2.5 pg mL-... Read More

Performance of lyotropic liquid crystal-based photoelectrochemical capacitors for solar-to- electrical energy conversion (2018)
Conference Proceeding
Halls, J. E., Ward, H. J., Althali, A. A., Testut, L., Kocsis, D., Alhassan, H. S., …Wadhawan, J. D. (2018). Performance of lyotropic liquid crystal-based photoelectrochemical capacitors for solar-to- electrical energy conversion. In SIPS 2018, 2017-

Regenerative photoelectrochemical capacitors, adapted from a experimental system previously reported (J. E. Halls, J. D. Wadhawan, Energy Environ. Sci., 2012, 5, 6541) and based on the doping of a lamellar lyotropic liquid crystal with visible light... Read More

Electrochemical measurement of antibody­‐antigen recognition biophysics: thermodynamics and kinetics of human chorionic gonadotropin (hCG) binding to redox-­tagged antibodies (2018)
Journal Article
Partington, L. I., Atkin, S. L., Kilpatrick, E. S., Morris, S. H., Piper, M., Lawrence, N. S., & Wadhawan, J. D. (in press). Electrochemical measurement of antibody­‐antigen recognition biophysics: thermodynamics and kinetics of human chorionic gonadotropin (hCG) binding to redox-­tagged antibodies. Journal of Electroanalytical Chemistry, ISSN 1572-6657

The thermodynamics and kinetics of antigen binding under diffusive conditions to an electrode surface modified with ferrocene-tagged antibodies is studied within this work, and realised experimentally for the case of human chorionic gonadotropin (hGC... Read More

Synthesis and antibacterial effects of cobalt–cellulose magnetic nanocomposites (2017)
Journal Article
Kelly, S., Kornherr, A., Alahmadi, N. S., Betts, J. W., Francesconi, M. G., Prior, T. J., …Kornherr, A. (2016). Synthesis and antibacterial effects of cobalt–cellulose magnetic nanocomposites. RSC advances, 7(32), (20020-20026). doi:10.1039/c7ra00920h. ISSN 2046-2069

© The Royal Society of Chemistry. Green synthesis is employed to prepare cobalt/cellulose nanocomposites with cubic (α-cobalt) cobalt as a main component with antibacterial and magnetic properties. An in situ reduction of aqueous solutions of cobalt... Read More

A mechanistic study of the EC′ mechanism – the split wave in cyclic voltammetry and square wave voltammetry (2016)
Journal Article
Ward, H. J., Lawrence, N. S., Wadhawan, J. D., Cooper, J. J., Fisher, A. C., & Song, P. (in press). A mechanistic study of the EC′ mechanism – the split wave in cyclic voltammetry and square wave voltammetry. RSC advances, 6(74), (70237-70242). doi:10.1039/c6ra08723j. ISSN 2046-2069

In this paper, a detailed investigation of electrochemical reactions coupled with homogenous chemical steps using cyclic voltammetry (CV) and square wave voltammetry (SWV) was carried out to study the electrocatalytic (EC’) mechanism. In CV, paramete... Read More

Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure (2016)
Journal Article
Haywood, S. K., Rybchenko, S. I., Touhami, D., & Wadhawan, J. D. (2016). Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure. ChemSusChem, 9(13), 1660-1669. https://doi.org/10.1002/cssc.201600267

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The recently proposed highly efficient route of pyridine-catalyzed CO 2 reduction to methanol was explored on platinum electrodes at high CO 2 pressure. At 55 bar (5.5 MPa) of CO 2 , the bulk elec... Read More

A route to unbuffered pH monitoring: A novel electrochemical approach (2016)
Journal Article
Dai, C., Chan, C. I., Barrow, W., Smith, A., Song, P., Potier, F., …Lawrence, N. S. (2016). A route to unbuffered pH monitoring: A novel electrochemical approach. Electrochimica acta, 190, 879-886. https://doi.org/10.1016/j.electacta.2016.01.004

Carbon paste electrodes modified by various dihydroxyquinone derivatives are investigated using both cyclic voltammetry and square wave voltammetry in order to ascertain suitability as voltammetric pH sensors. These electrodes show a Nernstian respon... Read More

Mg/Ca ratios in freshwater microbial carbonates: Thermodynamic, kinetic and vital effects (2014)
Journal Article
Pedley, H., Greenway, G., Rogerson, M., Wadhawan, J., & Saunders, P. (2014). Mg/Ca ratios in freshwater microbial carbonates: Thermodynamic, kinetic and vital effects. Geochimica et cosmochimica acta, 147, (107-118). doi:10.1016/j.gca.2014.10.014. ISSN 0016-7037

The ratio of magnesium to calcium (Mg/Ca) in carbonate minerals in an abiotic setting is conventionally assumed to be predominantly controlled by (Mg/Ca)solution and a temperature dependant partition coefficient. This temperature dependence suggests... Read More

Linking mineralisation process and sedimentary product in terrestrial carbonates using a solution thermodynamic approach (2014)
Journal Article
Rogerson, M., Pedley, H. M., Kelham, A., & Wadhawan, J. D. (2014). Linking mineralisation process and sedimentary product in terrestrial carbonates using a solution thermodynamic approach. Earth surface dynamics European Geosciences Union, 2(1), (197-216). doi:10.5194/esurf-2-197-2014. ISSN 2196-6311

Determining the processes which generate terrestrial carbonate deposits (tufas, travertines and to a lesser extent associated chemical sediments such as calcretes and speleothems) is a long-standing problem. Precipitation of mineral products from sol... Read More

Empowering the smart grid: Can redox batteries be matched to renewable energy systems for energy storage? (2013)
Journal Article
Halls, J. E., Hawthornthwaite, A., Hepworth, R. J., Roberts, N. A., Wright, K. J., Zhou, Y., …Wadhawan, J. D. (2013). Empowering the smart grid: Can redox batteries be matched to renewable energy systems for energy storage?. Energy & environmental science, 6(3), (1026-1041). doi:10.1039/c3ee23708g. ISSN 1754-5692

The charging of an undivided cerium-zinc redox battery by various current waveforms some of which mimic the output of renewable energy (solar, wind, tidal, biofuel burning) to electricity transducers is considered in this work, where the battery oper... Read More

Wastewater as a photoelectrochemical fuel source: light-to-electrical energy conversion with organochloride remediation (2012)
Journal Article
Halls, J. E., Johnson, T., Altalhi, A. A., & Wadhawan, J. D. (2012). Wastewater as a photoelectrochemical fuel source: light-to-electrical energy conversion with organochloride remediation. Electrochemistry communications, 22, (4-7). doi:10.1016/j.elecom.2012.04.024. ISSN 1388-2481

A photogalvanic cell that employs 2,4-dichlorophenol as a fuel source, an N-substituted phenothiazine as light harvester, and sacrificial zinc anode is presented, and shown to afford a ca. 4% light-to-electrical power conversion efficiency in violet... Read More

Voltammetry within structured liquid nanosystems: towards the design of a flexible, three-dimensional framework for artificial photosystems (2012)
Journal Article
Halls, J. E., Wright, K. J., Pickersgill, J. E., Smith, J. P., Altalhi, A. A., Bourne, R. W., …Kelly, S. M. (2012). Voltammetry within structured liquid nanosystems: towards the design of a flexible, three-dimensional framework for artificial photosystems. Electrochimica acta, 70, (215-227). doi:10.1016/j.electacta.2012.03.052. ISSN 0013-4686

Normal lyotropic liquid crystals (in the lamellar or hexagonal phases) are investigated as a route to afford a structured, three-dimensional, quasi-biphasic framework within which electron transfer cascades may be initiated voltammetrically. For mode... Read More

Electrochemistry of organometallic lyotropic chromonic liquid crystals (2012)
Journal Article
Halls, J. E., Bourne, R. W., Wright, K. J., Partington, L. I., Tamba, M. G., Zhou, Y., …Wadhawan, J. D. (2012). Electrochemistry of organometallic lyotropic chromonic liquid crystals. Electrochemistry communications, 19(1), (50-54). doi:10.1016/j.elecom.2012.02.032. ISSN 1388-2481

Two aqueous lyotropic chromonic liquid crystals made from nickel(II) or copper(II) phthalocyananine tetrasulfonic acid tetrasodium salt are prepared with characterisation through optical polarising microscopy, X-ray diffraction and conductivity. Thes... Read More

Concentration-dependent diffusion coefficients of tert-butylferrocene within dodecyltrimethylammonium chloride/brine liquid crystals (2012)
Journal Article
Halls, J. E., Altalhi, A. A., De Abreu, F. C., Goulart, M. O., & Wadhawan, J. D. (2012). Concentration-dependent diffusion coefficients of tert-butylferrocene within dodecyltrimethylammonium chloride/brine liquid crystals. Electrochemistry communications, 17, (41-44). doi:10.1016/j.elecom.2012.01.013. ISSN 1388-2481

The title lyotropic liquid crystal is examined as a framework to investigate long-range charge transfer, using tert-butylferrocene (tBuFc) as model hydrophobic system. It is found that the apparent one-dimensional diffusion coefficient depends on the... Read More

Voltammetric Immunoassay for the Detection of Protein Biomarkers (2012)
Journal Article
Haswell, S. J., Dou, Y., Wadhawan, J., & Greenman, J. (2012). Voltammetric Immunoassay for the Detection of Protein Biomarkers. Electroanalysis, 24(2), 264-272. doi:10.1002/elan.201100676

A strategy for a fast (ca. 20 min), specific, electrochemical immunoassay for the cardiac biomarker creatine kinase (CK) and the human cytokine interleukin 10 (IL10) has been developed in this paper. The polyaniline modified gold surface formed from... Read More

Photogalvanic cells based on lyotropic nanosystems: towards the use of liquid nanotechnology for personalised energy sources (2012)
Journal Article
Wadhawan, J. D., & Halls, J. E. (2012). Photogalvanic cells based on lyotropic nanosystems: towards the use of liquid nanotechnology for personalised energy sources. Energy & environmental science, 5(4), (6541-6551). doi:10.1039/c2ee03169h. ISSN 1754-5692

A lightweight, autonomous and practical, proof-of-concept electrical power source is developed within this work. It comprises a photoredox-active material embedded within the non-ionic surfactant subphase, with a second redox reagent present within t... Read More

Electrochemical estimation of diffusion anisotropy of N,N,N′,N′-tetramethyl-para-phenylenediamine within the normal hexagonal lyotropic mesophase of triton X 100/light water: when can the effects of cross-pseudophase electron transfer be neglected for par (2011)
Journal Article
Lawrence, N. S., Halls, J. E., & Wadhawan, J. D. (2011). Electrochemical estimation of diffusion anisotropy of N,N,N′,N′-tetramethyl-para-phenylenediamine within the normal hexagonal lyotropic mesophase of triton X 100/light water: when can the effects of cross-pseudophase electron transfer be neglected for partitioned reagents?. Journal of Physical Chemistry B, 115(20), 6509-6523. doi:10.1021/jp201806f

The H1 lyotropic liquid crystalline phase of Triton X 100 with aqueous 0.1 M potassium chloride is examined as a medium in which to determine the axiosymmetric anisotropy in the diffusion flux of N,N,N′,N′-tetramethyl-para-phenylenediamin... Read More

Electron hopping rate measurements in ITO junctions: charge diffusion in a layer-by-layer deposited ruthenium(II)-bis(benzimidazolyl)pyridine-phosphonate- TiO2 film (2011)
Journal Article
Dale, S. E. C., Cummings, C. Y., Wadhawan, J. D., Nakabayashi, T., Haga, M. A., Rassaei, L., …Wadhawan, J. (2011). Electron hopping rate measurements in ITO junctions: charge diffusion in a layer-by-layer deposited ruthenium(II)-bis(benzimidazolyl)pyridine-phosphonate- TiO2 film. Journal of Electroanalytical Chemistry, 657(1-2), (196-201). doi:10.1016/j.jelechem.2011.04.010. ISSN 1572-6657

Focused ion beam (FIB) machining allowed a sub-micron trench to be cut through tin-doped indium oxide (ITO) film on glass to give a generator - collector junction electrode with narrow gap (ca. 600 nm). A layer-by-layer deposited film composed of a d... Read More

Biphasic voltammetry of N, N, N ', N '-tetraphenyl-para-phenylenediamine microdroplets, microparticles and microparticle suspensions (2011)
Journal Article
Halls, J. E., & Wadhawan, J. D. (2011). Biphasic voltammetry of N, N, N ', N '-tetraphenyl-para-phenylenediamine microdroplets, microparticles and microparticle suspensions. Electroanalysis, 23(4), (997-1006). doi:10.1002/elan.201000633. ISSN 1040-0397

The aqueous biphasic voltammetry of the title compound is examined when it is immobilised on an electrode surface either when dissolved in an array of nitrobenzene droplets, in the form of solid microparticles, or when an electrode is immersed into a... Read More

Viability of plant spore exine capsules for microencapsulation (2010)
Journal Article
Barrier, S., Diego-Taboada, A., Thomasson, M. J., Pointon, J. C., Wadhawan, J. D., Beckett, S. T., …Wadhawan, J. (2011). Viability of plant spore exine capsules for microencapsulation. Journal of materials chemistry, 21(4), (975-981). doi:10.1039/c0jm02246b. ISSN 0959-9428

Sporopollenin exine capsules (SECs) (outer exoskeletal wall of the spores of Lycopodium clavatum) were extracted and examined for their potential use as microcapsules. They were shown, by laser scanning confocal microscopy (LSCM), to be void of their... Read More