A. K. Whittaker

Publication List Details

Period

1999 - 2009

Number

162

Co-Authors

The radiation degradation of a nanotube-polimide nanocomposite (2008)

Nielsen, K. L. C., Hill, D. J. T., Watson, K. A., Connell, J. W., Ikeda, S., Kudo, H., ...

The radiation degradation of a nanotube–polyimide nanocomposite was studied. Radiation chemistry was observed that was not present in the unmodified polymer or in the imbedded single-walled carbon...

Proton conduction mechanism and the stability of sol-gel titanium phosphates (2007)

Hogarth, W. H. J., Muir, S. S., Whittaker, A. K., Diniz Da Costa, J. C., Drennan, J., Lu, G.

Proton conducting sol-gel titanium phosphates were synthesised and characterised with a specific focus on the structural characteristics of the materials which enable proton conductivity and on...

A method for estimating the nature and relative proportions of amorphous, single, and double-helical components in starch granules by 13C CP/MAS NMR (2007)

Tan, I., Flanagan, B. M., Halley, P. J., Whittaker, A. K., Gidley, M. J.

An improved method to analyze the C-13 NMR spectra of native starches, which considers the contribution of the V-type conformation and the nature of the amorphous component, has been developed....

Preferential interactions of calcium ions in poly(2-hydroxyethyl methacrylate) hydrogels (2007)

Hill, D. J. T., Whittaker, A. K., Lambert, L., Chirila, T. V.

An investigation of the preferential interaction of calcium ions with oxygen atoms in poly(2-hydroxyethyl methacrylate) (PHEMA)-based hydrogels has been carried out. The formation of polymer-Ca...

Mechanism of 157 nm photodegradation of poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-co-tetrafluorethylene] (Teflon AF) (2007)

Blakey, I., George, G.A., Hill, D.J.T., Liu, H., Rasoul, F., Zimmerman, P.A., ...

The photodegradation at 157 nm of thin films of a series of Teflon AF copolymers has been comprehensively examined using electron spin resonance, NMR, FTIR, and Raman spectroscopies, mass...

Surface-functionalized polymer nanoparticles for selective sequestering of heavy metals (2006)

Bell, C. A., Smith, S. V., Whittaker, M. R., Whittaker, A. K., Gahan, L. R., Monteiro, M. J.

Xanthate-mediated (reversible addition-fragmentation chain transfer) emulsion polymerization has been used to create novel polystyrene nanoparticles with functionalized surfaces (see Figure) for the...

The hydration of paper studied with solid-state magnetisation-exchange H-1 NMR spectroscopy (2006)

Garvey, C. J., Parker, I. H., Simon, G. P., Whittaker, A. K.

The wide-line H-1 nuclear magnetic resonance (NMR) spectrum of paper in equilibrium with ambient humidity consists of super-imposed relatively broad and narrow lines. The narrower line is of the...

In-vitro study of the spontaneous calcification of PHEMA-based hydrogels in simulated body fluid (2006)

Hill, D. J. T., Whittaker, A. K., Chirila, T. V.

In-vitro calcification of poly(2-hydroxyethyl methacrylate) (PHEMA)-based hydrogels in simulated body fluid (SBF) under a steady/batch system without agitation or stirring the solutions has been...

Solution properties of star and linear poly(N-isopropylacrylamide) (2006)

Plummer, R., Hill, D. J. T., Whittaker, A. K.

The LCST transitions of novel N-isopropylacrylamide ( NIPAM) star polymers, prepared using the four-armed RAFT agent pentaerythritoltetrakis(3-(S-benzyltrithiocarbonyl) propionate) (PTBTP) and their...

DOSY NMR studies of chemical exchange behavior of poly(2-hydroxyethyl methacrylate) (2006)

Plummer, R., Hill, D. J. T., Whittaker, A. K.

PFG-NMR was used to study the chemical exchange of linear PHEMA having a range of molecular weights with water in DMSO containing varying quantities of water. The aim was to investigate the use of...

Vitamin B-12 release from P(HEMA-co-THFMA) in water and SBF: A model drug release study (2005)

Chowdhury, M. A., Hill, D. J. T., Whittaker, A. K.

A model drug release study on the ingress of water and Kokubo simulated body fluid (SBF) into poly(2-hydroxyethyl methacrylate) (THFMA) and its copolymers with tetrahydrofurfuryl methacrylate (THFMA)...

Study of the calcification of PHEMA hydrogels using a two compartment permeation cell (2005)

Chirila, T. V., Hill, D. J. T., Whittaker, A. K.

To simulate the process of calcification in hydrogel implants, particularly calcification inside hydrogels, in vitro experiments using two compartment permeation cells have been performed. PHEMA...

NMR imaging of the diffusion of water at 310 K into poly[(2-hydroxyethyl methacrylate)-co-(tetrahydrofurfuryl methacrylate)] containing vitamin B12 or aspirin (2005)

Chowdhury, M. A., Hill, D. J. T., Whittaker, A. K.

The ingress of water into copolymers of 2-hydroxyethyl methacrylate (HEMA) and tetrahydrofurfuryl methacrylate (THFMA) loaded with either one of two model drugs, ie vitamin B-12 or aspirin, was...

Synthesis of gadolinium-labeled shell-crosslinked nanoparticles for magnetic resonance imaging applications (2005)

Turner, J. L., Pan, D. P. J., Plummer, R., Chen, Z. Y., Whittaker, A. K., Wooley, K. L.

Shell-crosslinked knedel-like nanoparticles (SCKs; knedel is a Polish term for dumplings) were derivatized with gadolinium Shell chelates and studied as robust magnetic-resonance-imaging-active...

Salt diffusion and distribution in meat studied by Na-23 nuclear magnetic resonance imaging and relaxometry (2005)

Bertram, H. C., Holdsworth, S. J., Whittaker, A. K., Andersen, H. J.

This study introduces the use of combined Na-23 magnetic resonance imaging (MRI) and Na-23 NMR relaxometry for the study of meat curing. The diffusion of sodium ions into the meat was measured using...

Equilibrium swelling measurements of network and semicrystalline polymers in supercritical carbon dioxide using high-pressure NMR (2005)

Thurecht, K. J., Hill, D. J. T., Whittaker, A. K.

The extent of swelling of cross-linked poly(dimethylsiloxane) and linear low-density poly(ethylene) in supercritical CO2 has been investigated using high-pressure NMR spectroscopy and microscopy....

Analysis of lipoproteins using 2D diffusion-edited NMR spectroscopy and multi-way chemometrics (2005)

Dyrby, M., Petersen, M., Whittaker, A. K., Lambert, L., Norgaard, L., Bro, R., ...

This study represents the first application of multi-way calibration by N-PLS and multi-way curve resolution by PARAFAC to 2D diffusion-edited H-1 NMR spectra. The aim of the analysis was to evaluate...

Visualization of drip channels in meat using NMR microimaging (2004)

Bertram, H. C., Whittaker, A. K., Andersen, H. J., Karlsson, A. H.

The progressive changes in the water distribution within rabbit muscles were studied by nuclear magnetic resonance microscopy during the first 24 h postmortem. T-2 images revealed development of...

The states, diffusion, and concentration distribution of water in radiation-formed PVA/PVP hydrogels (2004)

Hill, D. J. T., Strounina, E., Whittaker, A. K., Chirila, T. V.

Hydrogels with various compositions of polyvinyl alcohol (PVA) and poly(1-vinyl-2-pyrrolidinone) (PVP) were prepared by irradiating mixtures of PVA and PVP in aqueous solutions with gamma-rays from...

NMR imaging of the diffusion of water at 310 K into semi-IPNs of PEM and Poly(HEMA-co-THFMA) (2004)

Chowdhury, M. A., Hill, D. J. T., Whittaker, A. K., Braden, M., Patel, M. P.

Magnetic resonance imaging has been used to monitor the diffusion of water at 310 K into a series of semi-IPNs of poly(ethyl methacrylate), PEM, and copolymers of 2-hydroxyethyl methacrylate, HEMA,...

Investigation into the diffusion of water into HEMA-co-MOEP hydrogels (2004)

George, K. A., Wentrup-Byrne, E., Hill, D. J. T., Whittaker, A. K.

Cross-linked homopolymers and copolymers of 2-hydroxyethyl methacrylate, HEMA, and ethylene glycol methacrylate phosphate, MOEP, have been synthesized, and the diffusion of water into these systems...

An investigation of the nitroxide-mediated preirradiation grafting of styrene onto PFA (2004)

Dargaville, T. R., George, G. A., Hill, D. J. T., Whittaker, A. K.

Simultaneous and preirradiation grafting of styrene onto fluorinated polyolefins does not enable control of the molecular weights or polydispersities of the styrene grafts. The nitroxide-mediated...

Water characteristics in cooked beef as influenced by ageing and high-pressure treatment -an NMR micro imaging study (2004)

Bertram, H. C., Whittaker, A. K., Shorthose, W. R., Andersen, H. J., Karlsson, A. H.

The water characteristics in cooked pressure-heat treated (45 degreesC for 45 min prior to pressurisation at 150 MPa for 30 min) and non-pressurised, cooked (control) samples of beef Longissimus aged...

Determination of domain sizes in blends of poly(ethylene) and poly(styrene) formed in the presence of supercritical carbon dioxide (2004)

Thurecht, K. J., Hill, D. J. T., Preston, C. M. L., Rintoul, L., White, J. W., Whittaker, A. K.

Well-mixed blends of poly(ethylene) and poly(styrene) have been synthesized using supercritical carbon dioxide as a solvent. The morphology of the blends has been conclusively characterized using...

The use of simultaneous H-1 & P-31 magic angle spinning nuclear magnetic resonance measurements to characterize energy metabolism during the conversion of muscle to meat (2004)

Bertram, H. C., Whittaker, A. K., Andersen, H. J., Karlsson, A. H.

In order to investigate the potential of magic angle spinning nuclear magnetic resonance (MAS NMR) in the elucidation of post-mortem metabolism in muscle biopsies, simultaneous H-1 and (31)p MAS NMR...

Water diffusion in methacrylate based copolymer hydrogels of 2-hydroxyethyl methacrylate (2004)

Hill, D. J. T., Chowdhury, M., Ghi, P. Y., Moss, N. G., Whittaker, A. K.

The diffusion of water into cylinders of polyHEMA and copolymers of HEMA with THFMA, BMA and CHMA were studied over a range of copolymer compositions. The diffusion of water into the polymers was...

Ultrasonic absorption in polymer gel dosimeters (2003)

Mather, M. L., Collings, A. F., Bajenov, N., Whittaker, A. K., Baldock, C.

Ultrasonic absorption in polymer gel dosimeters was investigated. An ultrasonic interferometer was used to study the frequency (f) dependence of the absorption coefficient (alpha) in a polyacrylamide...

New structure formation on gamma-irradiation of poly(chlorotrifluoroethylene) (2003)

Hill, D. J. T., Thurecht, K. J., Whittaker, A. K.

The radiation chemistry of PCTFE at different temperatures has been studied. The polymer was irradiated under vacuum to absorbed doses of up to 1500 kGy. Three irradiation temperatures were chosen....

Water sorption into poly[(2-hydroxyethyl methacrylate)-co-(1-vinyl-2-pyrrolidone]at 310 K (2003)

Malak, M., Hill, D. J. T., Whittaker, A. K.

Poly(2-hydroxyethyl methacrylate) and copolymers of 2-hydroxyethyl methacrylate (HEMA) and 1-vinyl-2-pyrrolidone (VP) in the form of cylindrical samples (approximate to8mm x 20mm) have been prepared...

A study of the radiation chemistry of poly(chlorotrifluoroethylene) by ESR spectroscopy (2003)

Hill, D. J. T., Thurecht, K. J., Whittaker, A. K.

The ESR spectra of poly(chlorotrifluoroethylene) were recorded following gamma-radiolysis under vacuum at room temperature and 77 K. The very broad spectrum at 77 K revealed little fine structure...

G-values for scission and crosslinking on gamma-radiolysis of Ultem at 303 K (2003)

Devasahayam, S., Hill, D. J. T., Whittaker, A. K.

The radiation chemical yields G(S) and G(X) for H-linking and Y-linking models for Ultem have been calculated from molecular weight analysis by gel permeation chromatography. These G-values have been...

High energy radiation grafting of fluoropolymers (2003)

Dargaville, T. R., George, G. A., Hill, D. J. T., Whittaker, A. K.

Fluoropolymers are known as chemically inert materials with good high temperature resistance, so they are often the materials of choice for harsh chemical environments. These properties arise because...

An investigation of the thermal and tensile properties of PFA following gamma-radiolysis (2003)

Dargaville, T. R., George, G. A., Hill, D. J. T., Whittaker, A. K.

For some applications for fluoropolymers they must be subjected to high-energy radiation, e.g., when they are grafted with styrene using an irradiation method to produce fuel cell membranes or matrix...

Investigation of the vapor-phase grafting of styrene onto PFA (2003)

Dargaville, T. R., George, G. A., Hill, D. J. T., Whittaker, A. K.

Poly(tetrafluoroethylene-co-perfluoropropyI vinyl ether), PFA, was grafted with styrene from the vapor phase using a simultaneous radiation grafting method. The graft yields were measured as a...

Cross-linking of PFA by electron beam irradiation (2003)

Dargaville, T. R., George, G. A., Hill, D. J. T., Scheler, U., Whittaker, A. K.

The effect of electron beam radiation on a perfluoroalkoxy (PFA) resin was examined using solid-state high-speed magic angle spinning F-19 NMR spectroscopy and FT-IR spectroscopy. Samples were...

Chain scission and branching in irradiated poly(tetrafluoroethylene-co-hexafluoropropylene) (2003)

Hill, D. J. T., Mohajerani, S., Whittaker, A. K., Scheler, U.

The radiation chemistry of poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) with a TFE mole fraction of 0.90 has been studied under vacuum using Co-60 gamma-radiation over a range of...

Determination of T1pH relaxation rates in charred and uncharred wood and consequences for NMR quantitation (2002)

Smernik, R. J., Baldock, J. A., Oades, J. M., Whittaker, A. K.

The performance of three different techniques for determining proton rotating frame relaxation rates (T1pH) in charred and uncharred woods is compared. The variable contact time (VCT) experiment is...

H-1 NMR study of the states of water in equilibrium Poly(HEMA-co-THFMA) hydrogels (2002)

Ghi, P. Y., Hill, D. J. T., Whittaker, A. K.

The spin-spin relaxation times, T-2, of hydrated samples of poly(hydroxymethyl methacrylate), PHEMA, poly(tetrahydrofurfuryl methacrylate),PTHFMA, and the,corresponding HEMA-THFMA copolymers have...

PFG-NMR measurements of the self-diffusion coefficients of water in equilibrium poly(HEMA-co-THFMA) hydrogels (2002)

Ghi, P. Y., Hill, D. J. T., Whittaker, A. K.

The self-diffusion coefficients for water in a series of copolymers of 2-hydroxyethyl methacrylate, HEMA, and tetrahydrofurfuryl methacrylate, THFMA, swollen with water to their equilibrium states...

High-speed MAS F-19 NMR analysis of an irradiated fluoropolymer (2002)

Dargaville, T. R., George, G. A., Hill, D. J. T., Scheler, U., Whittaker, A. K.

The effect of gamma-radiation on a perfluoroalkoxy (PFA) resin was examined using solid-state high-speed magic angle spinning (MAS) F-19 NMR spectroscopy. Samples were prepared for analysis by...

The radiation chemistry of ultem at 77 K as revealed by ESR spectroscopy (2002)

Devasahayam, S., Hill, D. J. T., Pomery, P. J., Whittaker, A. K.

Radical formation in ultem following gamma-radiolysis has been reassessed, and the G(R*) values at different temperatures have been determined by ESR spectroscopy. The radical assignment and radical...

The copolymerization of N-vinyl-2-pyrrolidone with 2-hydroxyethyl methacrylate (2002)

Faragalla, M. M., Hill, D. J. T., Whittaker, A. K.

The bulk free radical copolymerization of 2-hydroxyethyl methacrylate (HEMA) with N-vinyl-2-pyrrolidone (VP) was carried out to low conversions at 50 degreesC, using benzoyl peroxide (BPO) as...

Axial mixing in rotating drums using magnetic resonance imaging using bran as a model for solid state fermentations (2002)

Hardin, M. T., Howes, T., Mitchell, D. A., Whittaker, A. K.

Magnetic resonance imaging (MRI) is an easily automated, reliable technique to investigate axial mixing within rotating drums. Moist bran can be clearly differentiated from dry bran using MRI...

Influence of synthesis parameters on the formation of mesoporous SAPOs (2002)

Zhao, X. S., Lu, G. Q., Whittaker, A. K., Drennan, J., Xu, H.

The synthesis and characterization of high-quality mesoporous silicoaluminophosphates (SAPOs) with a hexagonally arranged pore structure and a good thermal stability are described. The influence of...

Investigation of ultrasonic properties of PAG and MAGIC polymer gel dosimeters (2002)

Mather, M. L., De Deene, Y., Whittaker, A. K., Simon, G. P., Rutgers, R., Baldock, C.

Ultrasonic speed of propagation and attenuation were investigated as a function of absorbed radiation dose in PAG and MAGIC polymer gel dosimeters. Both PAG and MAGIC gel dosimeters displayed a...

C-13-NMR, H-1-NMR, and FT-Raman study of radiation-induced modifications in radiation dosimetry polymer gels (2001)

Lepage, M., Whittaker, A. K., Rintoul, L., Baldock, C.

H-1- and C-13-NMR spectroscopy and FT-Raman spectroscopy are used to investigate the properties of a polymer gel dosimeter post-irradiation. The polymer gel (PACT) is composed of acrylamide,...

The relationship between radiation-induced chemical processes and transverse relaxation times in polymer gel dosimeters (2001)

Lepage, M., Whittaker, A. K., Rintoul, L., Back, S. A. J., Baldock, C.

The effects of ionizing radiation in different compositions of polymer gel dosimeters are investigated using FT-Raman spectroscopy and NMR T-2 relaxation times. The dosimeters are manufactured from...

Modelling of post-irradiation events in polymer gel dosimeters (2001)

Lepage, M., Whittaker, A. K., Rintoul, L, Back, S. A. J., Baldock, C.

The nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) is related to the radiation-dependent concentration of polymer formed in polymer gel dosimeters manufactured from monomers in an...

NMR imaging of water sorption into poly(hydroxyethyl methacrylate-co-tetrahydrofurfuryl methacrylate) (2001)

Ghi, P. Y., Hill, D. J. T., Whittaker, A. K.

The diffusion of water into a series of hydroxyethyl methacrylate, HEMA, copolymers with tetrahydrofurfuryl methacrylate, THFMA, has been studied over a range of copolymer compositions using NMR...

The radical homopolymerization of N-phenylmaleimide, N-n-hexylmaleimide and N-cyclohexylmaleimide in tetrahydrofuran (2001)

Hill, D. J. T., Shao, L. Y., Pomery, P. J., Whittaker, A. K.

The kinetics and mechanisms of thermally initiated (using 2,2'-azobisisoburyronitrile (AIBN) as initiator) radical homopolymerizations of a series of maleimides, including N-phenymaleimide (PHMI)...

The use of F-19 NMR for new structure determination in the radiolysis of FEP (2001)

Gleason, K. K., Hill, D. J. T., Lau, K. K. S., Mohajerani, S., Whittaker, A. K.

The radiation chemistry of poly(tetrafluoroethylene-co-perfluoropropylene), FEP, with a mole fraction of tetrafluoroethylene, TFE, of 0.90 has been studied under vacuum using Co-60 gamma -radiation...

An ESR study of irradiated poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) (2001)

Dargaville, T. R., Hill, D. J. T., Whittaker, A. K.

Poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) with 2 mol% perfluoropropyl vinyl ether (PPVE) was exposed to gamma -irradiation in vacuum at both 77 K and room temperature and the ESR...

Molecular weight changes and scission and crosslinking in poly(dimethyl siloxane) on gamma radiolysis (2001)

Hill, D. J. T., Preston, C. M. L., Salisbury, D. J., Whittaker, A. K.

The molecular weight changes which occur on the gamma -radiolysis of poly(dimethyl siloxane) under vacuum between 77 and 373 K and in air at 303 K have been investigated using triple detection GPC to...

Solid state F-19 NMR determination of new structure formation in FEP following radiolysis at 300 and 363 K (2001)

Forsythe, J. S., Hill, D. J. T., Mohajerani, S., Whittaker, A. K.

The radiation chemistry of FEP copolymer with a mole fraction TFE of 0.90 has been studied using Co-60 gamma -radiation at temperatures of 300 and 363 K. New structure formation in the copolymers was...

The use of NMR for determination of new structures in irradiated TFE/PMVE fluoropolymers (2001)

Forsythe, J. S., Hill, D. J. T., Whittaker, A. K.

The radiation chemistry of two TFE/PMVE copolymers with TFE mole fractions of 0.66 and 0.81 has been studied under vacuum using Co-60 gamma -radiation over absorbed dose ranges up to 4.2 MGy. The...

Molecular motion in nanocomposites of poly(ethylene oxide) and montmorillonite (2001)

Whittaker, A. K., Kwiatkowski, J.

Motion of chains of poly(ethylene oxide) within the interlayer spacing of 2:1 phyllosilicate/montmorillonite was studied with H-1 and C-13 NMR spectroscopy. Measurements of the H-1 NMR line widths...

NMR study of the gamma radiolysis of poly(dimethyl siloxane) under vacuum at 303 K (2001)

Hill, D. J. T., Preston, C. M., Whittaker, A. K.

The structural changes which occur on the gamma -radiolysis of poly(dimethyl siloxane) (PDMS) under vacuum at 303 K have been investigated using Si-29 and C-13 NMR. New structural units consistent...

Copolymer hydrogels of 2-hydroxyethyl methacrylate with n-butyl methacrylate and cyclohexyl methacrylate: synthesis, characterization and uptake of water (2000)

Hill, D. J. T., Moss, N. G., Pomery, P. J., Whittaker, A. K.

The bulk free radical copolymerizations of 2-hydroxyethyl methacrylate (HEMA) with n-butyl methacrylate (BMA) or cyclohexyl methacrylate (CHMA) were studied over the composition mole fraction...

The use of crosslinking promoters in the gamma-radiolysis of poly(tetrafluoroethylene-co-perfluoromethylvinyl ether). I (1999)

Forsythe, J. S., Hill, D. J. T., Logothetis, A. L., Pomery, P. J., Whittaker, A. K.

Incorporation of 1 wt % of triallyl isocyanurate (TAIC) significantly enhanced the radiation crosslinking of the perfluoroelastomer, poly(tetrafluoroethylene-co-perfluoromethylvinyl ether)...

Carbon structure and porosity of carbonaceous adsorbents in relation to their adsorption properties (1999)

Haghseresht, F., Lu, G., Whittaker, A. K.

A number of carbonaceous adsorbents were prepared by carbonisation at 600 degrees C following acidic oxidation under various conditions. Effects of the chemical nature of the precursor, such as the...

Miscibility and specific interactions in blends of poly(4-vinylphenol) and poly(2-ethoxyethyl methacrylate) (1999)

Hill, D. T., Whittaker, A. K., Wong, K.

The properties of the hydrogen-bonded polymer blends of poly(4-vinylphenol) and poly(2-ethoxyethyl methacrylate) are presented. Spectroscopic techniques such as C-13 solid-state NMR and FT-IR are...

A comparative study of the effects of UV- and gamma-radiation on copolymers of acrylonitrile/butadiene (1999)

Cardona, F., Hill, D. T., Pomery, P., Whittaker, A. K.

The radiolysis of nitrile rubbers with different acrylonitrile/butadiene composition and the homopolymers, poly(butadiene) (PBD) and poly(acrylonitrile) (PAN) has been investigated and compared with...

Thermal and radiation curing of phenylethynyl terminated macromers (1999)

Preston, C. M. L., Hill, D. J. T., Pomery, P. J., Whittaker, A. K., Jensen, B. J.

The thermal and gamma-irradiation induced curing of two phenylethynyl terminated composite resin systems, DFB/BPF and PETI5A, was investigated. Thermal curing of these matrix resin samples was...