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A 11B and 31P MAS NMR study of the impact of Ca2+ and Sr2+ network modifying cations on the structure of borate and borophosphate glasses
Download2018-01-01
Jin, T., Bernard, G.M., Miskolzie, M., Terskikh, V.V., Michaelis, V.K.
A detailed qualitative and quantitative analysis of the short and medium range order of alkaline earth binary borate and ternary borophosphate glasses has been carried out through the use of 11B and 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. In order to understand...
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Alkaline Earth Metal–Organic Frameworks with Tailorable Ion Release: A Path for Supporting Biomineralization
Download2019-01-01
Matlinska, M.A., Ha, M., Hughton, B., Oliynyk, A.O., Iyer, A.K., Bernard, G.M., Lambkin, G., Lawrence, M.C., Katz, M.J., Mar, A., Michaelis, V.K.
An innovative application of metal–organic frameworks (MOFs) is in biomedical materials. To treat bone demineralization, which is a hallmark of osteoporosis, biocompatible MOFs (bioMOFs) have been proposed in which various components, such as alkaline-earth cations and bisphosphonate molecules,...
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Annealing induced structural evolution in feldspar dental glass-ceramics investigated by solid-state NMR spectroscopy
Download2020-01-01
Bhattacharya, A., Qiu, Y., Bernard, G.M., Butler, S., Mar, A., Michaelis, V.K.
Glass-ceramics are an attractive oxide-based material routinely used for biomineral repair such as porcelain veneers in dental crown applications. The short- and long-range structure of a commercial glass-ceramic feldspar material, VITA VM9, has been investigated as a function of annealing...
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Composition-Tunable Formamidinium Lead Mixed Halide Perovskites via Solvent-Free Mechanochemical Synthesis: Decoding the Pb Environments Using Solid-State NMR Spectroscopy
Download2018-01-01
Askar, A.M., Karmakar, A., Bernard, G.M., Ha, M., Terskikh, V.V., Wiltshire, B.D., Patel, S., Fleet, J., Shankar, K., Michaelis, V.K.
Mixed-halide lead perovskites are becoming of paramount interest in the optoelectronic and photovoltaic research fields, offering band gap tunability, improved efficiency, and enhanced stability compared to their single halide counterparts. Formamidinium-based mixed halide perovskites (FA-MHPs)...
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2018-01-01
Karmakar, A., Dodd, M.S., Agnihotri, S., Ravera, E., Michaelis, V.K.
Lead-free halide double perovskites with a generic formula of A2B′(III)B″(I)X6 (A and B are cations and X is a halide anion) are being explored as a less toxic, higher thermal- and moisture-stable alternative to well-studied lead halide perovskite (APbX3) solar energy absorbers. However, the...
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2020-01-01
Hooper, R.W., Klein, B.A., Michaelis, V.K.
The design of new materials requires a deep understanding of the intricacies underpinning their structure–property relationships. These relationships are modified through synthesis and processing to create materials with new properties and characteristics to achieve a wide range of applications....
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2019-01-01
Ha, M., Thiessen, A.N., Sergeyev, I.V., Veinot, J.G.C., Michaelis, V.K.
Silicon nanoparticles (SiNPs) are intriguing materials and their properties fascinate the broader scientific community; they are also attractive to the biological and materials science sub-disciplines because of their established biological and environmental compatibility, as well as their...
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2019-01-01
Bernard, G.M., Michaelis, V.K.
High‐field dynamic nuclear polarization nuclear magnetic resonance (DNP NMR) spectroscopy is rapidly emerging as a revolutionary analytical structural method by greatly enhancing the sensitivity of nuclear magnetic resonance. Innovative solutions are constantly being introduced to address the...
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Lead‐207 NMR spectroscopy at 1.4 T: Application of benchtop instrumentation to a challenging I = ½ nucleus
Download2020-01-01
Bernard, G.M., Michaelis, V.K.
The practicality of obtaining liquid‐ and solid‐state 207Pb nuclear magnetic resonance (NMR) spectra with a low permanent‐field magnet is investigated. Obtaining 207Pb NMR spectra of salts in solution is shown to be viable for samples as dilute as 0.05 M. The concentration dependence of the 207Pb...
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2019-01-01
Karmakar, A., Dodd, M.S., Zhang, X., Oakley, M.S., Klobukowski, M., Michaelis, V.K.
A simplified mechanochemical synthesis approach for Cs-containing mixed halide perovskite materials of lower and higher dimensionality (0D and 3D, respectively) is presented with stoichiometric control from their halide salts, CsX and PbX2 (X = Cl, Br, I). Excellent optical bandgap tunability...