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Shaw NM Blanis D Bodek A Budd H Coombes R Eno S Fry CA Harada H Ho YH Kim YK Kumita T Mori T Olsen SL Sill A Thorndike EH Ueno K Zheng HW Imlay R Kirk P Lim J McNeil RR Metcalf W Myung SS Cheng CP Gu P Li J Li YK Mao ZP Xu YT Zhu YC Abashian A Gotow K Hu K Low EH Mattson ME Naito F Piilonen L Sterner KL Lusin S Rosenfeld C Wang AT Wilson S Frautschi M Kagan H Kass R Trahern CG Breedon RE Kim GN Ko W Lander RL Maeshima K Malchow RL Smith JR Sparks K Williams MC Abe K Fujii Y Higashi Y Kim SK 《Physical review letters》1989,63(13):1342-1345
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High-pressure measurements of the resistivity of americium metal are reported to 27 GPa and down to temperatures of 0.4 K. The unusual dependence of the superconducting temperature (T(c)) on pressure is deduced. The critical field [H(c)(0) extrapolated to T=0] increases dramatically from 0.05 to approximately 1 T as the pressure is increased, suggesting that the type of superconductivity is changing as pressure increases. At pressures of approximately 16 GPa the 5f electrons of Am are changing from localized to itinerant, and the crystal structure also transforms to a complex one. The role of a Mott-type transition in the development of the peak in T(c) above 16 GPa is postulated. 相似文献
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Bintinger D Kees KH Masek GE Miller ES Thompson JR Vernon W White JT Eisner AM Palmer DA Sullivan MK Armitage JC Buijs A Van Driel MA Erné FC Langeveld WG Paar HP Sens JC Timmer J Van Uitert B Cain MP Ko W Lander RL Maeshima K McNeil RR Pellett DE Smith JR Williams MC Caldwell DO Joshi UP Lu A Schwitkis KA Yellin SJ 《Physical review letters》1985,54(8):763-766
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T. A. Lozinova A. V. Lander 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(1):163-169
Conditions for the formation of peroxyl radicals photosensitized by near-UV irradiation in frozen aqueous solutions of adenine containing 0.1 M NaCl (pH 4–7) are studied. Analysis of the EPR spectra shows that the systems under study contain two types of peroxyl radicals presumably classified earlier as O 2 ?· and HO 2· · . The effect of freezing methods on the production of the radicals is shown. The signal from O 2 ?· predominates in the spectra of samples with open surfaces and is likely due to the reduction of adsorbed O2 molecules with photoejected electrons. The signal from HO 2 · could be due to photoinduced interaction between the sensitizer and solvent. Possible mechanisms of these processes are considered. 相似文献
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Thermodynamic Properties of Polymorphs of Fluorosulfate Based Cathode Materials with Exchangeable Potassium Ions 下载免费PDF全文
Dr. Radha Shivaramaiah Laura Lander Dr. G. P. Nagabhushana Prof. Gwenaëlle Rousse Prof. Jean‐Marie Tarascon Prof. Alexandra Navrotsky 《Chemphyschem》2016,17(21):3365-3368
FeSO4F‐based frameworks have recently emerged as attractive candidates for alkali insertion electrodes. Mainly owing to their rich crystal chemistry, they offer a variety of new host structures with different electrochemical performances and physical properties. In this paper we report the thermodynamic stability of two such K‐based “FeSO4F” host structures based on direct solution calorimetric measurements. KFeSO4F has been reported to crystallize in two different polymorphic modifications—monoclinic and orthorhombic. The obtained enthalpies of formation from binary components (KF plus FeSO4) are negative for both polymorphs, indicating that they are thermodynamically stable at room temperature, which is very promising for the future exploration of sulfate based cathode materials. Our measurements show that the low‐temperature monoclinic polymorph is enthalpically more stable than the orthorhombic phase by ≈10 kJ mol?1, which is consistent with the preferential formation of monoclinic KFeSO4F at low temperature. Furthermore, observed phase transformations and difficulties in the synthesis process can be explained based on the obtained calorimetric results. The KMnSO4F orthorhombic phase is more stable than both polymorphs of KFeSO4F. 相似文献
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Roerdink Lander M Ibragimova S Rein C Vogel J Stibius K Geschke O Perry M Hélix-Nielsen C 《Langmuir : the ACS journal of surfaces and colloids》2011,27(11):7002-7007
Lipid bilayers are intrinsically fragile and require mechanical support in technical applications based on biomimetic membranes. Tethering the lipid bilayer membranes to solid substrates, either directly through covalent or ionic substrate-lipid links or indirectly on substrate-supported cushions, provides mechanical support but at the cost of small molecule transport through the membrane-support sandwich. To stabilize biomimetic membranes while allowing transport through a membrane-support sandwich, we have investigated the feasibility of using an ethylene tetrafluoroethylene (ETFE)/hydrogel sandwich as the support. The sandwich is realized as a perforated surface-treated ETFE film onto which a hydrogel composite support structure is cast. We report a simple method to prepare arrays of lipid bilayer membranes with low intrinsic electrical conductance on the highly permeable, self-supporting ETFE/hydrogel sandwiches. We demonstrate how the ETFE/hydrogel sandwich support promotes rapid self-thinning of lipid bilayers suitable for hosting membrane-spanning proteins. 相似文献