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Design of H-knee: a modular ceramic total knee replacement prosthesis
(Australasian Ceramic Society, 1988-09) Payten, WM; Ben-Nissan, B
Degenerative joint disease, recognized as an increasing problem for society, is a direct result of an aging population. When patients present with joint pain, their primary concern is the relief of pain and return to a mobile life style. This often requires replacement of skeletal parts, such as hips, knees, elbows, finger joints, shoulder, and teeth, or fusion of vertebrae, and repair or augmentation of the jaw and bones of the skull. The result is a current worldwide orthopedic market valued at over $5 billion; joint replacement represents 68% of this market. The demand for knee replacements is increasing at approximately 17%/ p.a., with some 300,000 knee joints replaced each year in the United States alone. This increase results in part from increased confidence in using such prostheses. Unfortunately, results do not reinforce this confidence: Long-term clinical results are scattered, and, although the overall rate of failure is reasonably low, it remains unacceptable. A further complication arises because the increase in younger patients undergoing total knee arthroplasty (TKA) may well lead to a higher incidence of eventual failure.
Synthesis of a new cage ligand, SarAr, and its complexation with selected transition metal ions for potential use in radioimaging
(Royal Society of Chemistry, 2001-07-12) Di Bartolo, NM; Sargeson, AM; Donlevy, TM; Smith, SV
A new hexaazamacrobicyclic cage ligand, 1-N-(4-aminobenzyl)-3,6,10,13,16,19-hexaazabicyclo[6.6.6]eicosane-1,8-diamine (SarAr) has been designed for conjugation to proteins. SarAr was synthesised and characterised by microanalyses, 1H NMR and electrospray mass spectrometry. The complexation of selected transition metal ions (Cu(II), Ni(II) and Co(II) at 10−6 M) by SarAr was complete within 30 min over pH 6 to 8. The [64Cu(SarAr)]2+ complex was investigated with a view to applications in radioimaging. The [64Cu(sar)]2+ complex was found to be stable in human plasma for at least 174 h and biodistribution studies in mice, showed that the [64Cu(SarAr)]2+complex was rapidly excreted through the renal system unlike the free 64Cu2+. Overall, the simple synthesis, ready complexation behaviour of SarAr, the kinetic inertness of the [Cu(SarAr)]2+ complex to dissociation of 64Cu and its facile elimination from mice make it an attractive prospect for use in nuclear medicine. © The Royal Society of Chemistry 2001
Corrigendum to “Application of chelating weak base resin Dowex M4195 to the recovery of uranium from mixed sulfate/chloride media” [Chem. Eng. J., 317 (2017) 80–89]
(Elsevier, 2017-09-15) Ogden, MD; Moon, EM; Wilson. A; Griffith, CS; Mata, JP; Soldenhoff, KH; Pepper, SE
The authors regret that the historical contributions from collaborators at ANSTO were not sufficiently acknowledged in this paper. The authors would like to add the following contributors, with the affiliations shown above. The acknowledgements should also state the following; “The authors would like to acknowledge the members of the Separations and Nuclear Chemical Engineering Research (SNUCER) group at the University of Sheffield who all assisted with this work in some capacity. Thank you to Prof. Neil Hyatt and Dr. Claire Corkhill in MIDAS, University of Sheffield for use of analytical equipment. Thank you to Dr. Gabriella Kakonyi at the Kroto Research Institute at the University of Sheffield for ICP-MS analysis. Funding was provided by the Department of Chemical and Biological Engineering at The University of Sheffield, as part of their start-up scheme. This work is published with the permission of the Australian Nuclear Science & Technology Organisation, where most of the work was conducted.” The authors would like to apologise for any inconvenience caused. © 2017 Elsevier B.V
Defect control and ionic conductivity of oxynitride perovskite Sr0.83Li0.17Ta0.83O1.88N0.74
(Elsevier, 2022-01) Kim, YI; Avdeev, M
Perovskite lattice was tailored by introducing site vacancies and mixed anion composition, to produce Sr0.83Li0.17Ta0.83O1.88N0.74 (Li02N). Further, Li02N was converted to a defect oxide Sr0.83Li0.17Ta0.83O3 (Li02O) by applying an optimized treatment: heating in air at 1173 K for 2 h. According to the neutron Rietveld refinement, Li02N and Li02O are tetragonal and orthorhombic, respectively, where the lattice volume of Li02O is significantly smaller than that of Li02N. The ionic conductivity (σion) of Li02N and Li02O was evaluated by the ac impedance spectroscopy and the equivalent circuit analysis. Both Li02N (σion = 10−5.5 S/cm at 671 K) and Li02O (σion = 10−6.2 S/cm at 667 K) exhibited an Arrhenius behavior of ionic conductivity with activation energies of 0.87 eV and 0.75 eV, respectively. It is interpreted that the nitride component enhances the ionic conduction of Li02N, while the vacancy of the anion lattice makes an opposite effect. © 2021 Elsevier Ltd and Techna Group S.r.l.
Role of a-site molecular ions in the polar functionality of metal–organic framework perovskites
(American Chemical Society (ACS), 2021-12-28) Lu, T; Cortie, DL; Li, ZX; Narayanan, N; Liu, Z; Sun, QB; Frankcombe, TJ; McIntyre, GJ; Yu, D; Liu, Y
Recent studies on organic–inorganic hybrid perovskites (OIHPs) and ferroelectric metal–organic framework perovskites (MOFPs) reveal their superb performance as highly efficient materials for photovoltaics and ferroelectrics. This has enabled the development of a new generation of optic-electronic-mechanical devices based on green chemistry. However, the fundamental understanding of these polarization-related functionalities is not yet clear, which has hindered the progress in further designing and developing materials with expected properties. In this work, we investigate three MOFPs that have the same Mg(HCOO)3– frameworks with different molecular ions: [CH3NH3][Mg(HCOO)3] (MA-MOF), [(CH3)2NH2][Mg(HCOO)3] (DMA-MOF), and [C(NH2)3][Mg(HCOO)3] (GUA-MOF). Single-crystal and powder X-ray diffraction, inelastic neutron spectroscopy, and ab initio molecular dynamics simulations are combined to achieve a detailed description of the three MOFPs’ static and dynamic structures as a function of temperature. Intriguingly, our study reveals that the alignments and motions of the guest molecular ions are highly dependent on the directional hydrogen bonds that link N–H units to the surrounding MgO6 octahedra through the O acceptor from the frameworks. At the same time, the size, dynamic behavior, and alignments of the A-site molecular ions influence the distortive framework structures and their temperature-dependent deformation. Therefore, the mutual interaction between the guest and the framework determines the overall functionalities of the MOFPs. This study indicates that the configuration of the A-site molecular ions and the potential hydrogen bonds are critical to design the polar functionalities in both MOFPs and OIHPs. © 2021 American Chemical Society

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