Search

Your search keyword '"Rode, A. V."' showing total 343 results
Start Over Author "Rode, A. V." Search Limiters Academic (Peer-Reviewed) Journals
343 results on '"Rode, A. V."'

12. Megahertz single-particle imaging at the European XFEL

Author

Sobolev, Egor, Zolotarev, Serguey, Giewekemeyer, Klaus, Bielecki, Johan, Okamoto, Kenta, Reddy, Hemanth K. N., Andreasson, Jakob, Ayyer, Kartik, Barak, Imrich, Bari, Sadia, Barty, Anton, Bean, Richard, Bobkov, Sergey, Chapman, Henry N., Chojnowski, Grzegorz, Daurer, Benedikt J., Dörner, Katerina, Ekeberg, Tomas, Flückiger, Leonie, Galzitskaya, Oxana, Gelisio, Luca, Hauf, Steffen, Hogue, Brenda G., Horke, Daniel A., Hosseinizadeh, Ahmad, Ilyin, Vyacheslav, Jung, Chulho, Kim, Chan, Kim, Yoonhee, Kirian, Richard A., Kirkwood, Henry, Kulyk, Olena, Letrun, Romain, Loh, Duane, Messerschmidt, Marc, Mühlig, Kerstin, Ourmazd, Abbas, Raab, Natascha, Rode, Andrei V., Rose, Max, Round, Adam, Sato, Takushi, Schubert, Robin, Schwander, Peter, Sellberg, Jonas A., Sikorski, Marcin, Silenzi, Alessandro, Song, Changyong, Spence, John C. H., Stern, Stephan, Sztuk-Dambietz, Jolanta, Teslyuk, Anthon, Timneanu, Nicusor, Trebbin, Martin, Uetrecht, Charlotte, Weinhausen, Britta, Williams, Garth J., Xavier, P Lourdu, Xu, Chen, Vartanyants, Ivan, Lamzin, Victor, Mancuso, Adrian, and Maia, Filipe R. N. C.

Subjects
Physics - Instrumentation and Detectors, Physics - Biological Physics
Abstract

The emergence of high repetition-rate X-ray free-electron lasers (XFELs) powered by superconducting accelerator technology enables the measurement of significantly more experimental data per day than was previously possible. The European XFEL will soon provide 27,000 pulses per second, more than two orders of magnitude more than any other XFEL. The increased pulse rate is a key enabling factor for single-particle X-ray diffractive imaging, which relies on averaging the weak diffraction signal from single biological particles. Taking full advantage of this new capability requires that all experimental steps, from sample preparation and delivery to the acquisition of diffraction patterns, are compatible with the increased pulse repetition rate. Here, we show that single-particle imaging can be performed using X-ray pulses at megahertz repetition rates. The obtained results pave the way towards exploiting high repetition-rate X-ray free-electron lasers for single-particle imaging at their full repetition rate.

Published
2019
Full Text
View/download PDF

22. ZrO2 Supported Cu Nanoparticles for Sonogashira and Ullmann Coupling Reactions Under Palladium-Free Conditions.

Author

Patil, Seema P., Rajmane, Archana S., Jadhav, Sanjay N., Rajmane, Vijaya S., Rode, Chandrashekhar V., and Kumbhar, Arjun S.

Subjects
SONOGASHIRA reaction, COUPLING reactions (Chemistry), COPPER, COPPER catalysts, ARYL bromides, NANOPARTICLES, ARYL halides
Abstract

Cu nanoparticles supported on ZrO2 (CuNPs@ZrO2) were synthesized using a one‐step co-precipitation process, and their application in C–C coupling reactions was investigated. The catalyst was characterized using XRD, XPS, SEM, TEM, and TGA techniques. The prepared catalyst was used for the Sonogashira cross-coupling reactions of aryl bromides with phenyl-acetylene in the presence of K2CO3 in DMF at 110 °C, which resulted in substituted alkynes with good to excellent yields. The protocol was also extended for the Ullmann coupling reactions of aryl iodides under similar reaction conditions, yielding the desired products with good to excellent yields without homo-coupling. Interestingly, unlike other copper catalysts, the present catalyst worked under air and did not require an inert atmosphere to prevent alkyne. This catalytic system is versatile, tolerant, and significantly cheaper than the "traditional" Pd-catalyzed Sonogashira cross-coupling of terminal alkynes with aryl halides. The catalyst could be reused for five catalytic cycles with no significant change in the product yield. All of these characteristics make our prepared CuNPs@ZrO2 catalyst quite suitable for the gram-scale synthesis of biaryls and alkynes, with a simple workup. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

30. Megahertz single-particle imaging at the European XFEL

Author

Sobolev, Egor, Zolotarev, Sergei, Giewekemeyer, Klaus, Bielecki, Johan, Okamoto, Kenta, Reddy, Hemanth K. N., Andreasson, Jakob, Ayyer, Kartik, Barak, Imrich, Bari, Sadia, Barty, Anton, Bean, Richard, Bobkov, Sergey, Chapman, Henry N., Chojnowski, Grzegorz, Daurer, Benedikt J., Dörner, Katerina, Ekeberg, Tomas, Flückiger, Leonie, Galzitskaya, Oxana, Gelisio, Luca, Hauf, Steffen, Hogue, Brenda G., Horke, Daniel A., Hosseinizadeh, Ahmad, Ilyin, Vyacheslav, Jung, Chulho, Kim, Chan, Kim, Yoonhee, Kirian, Richard A., Kirkwood, Henry, Kulyk, Olena, Küpper, Jochen, Letrun, Romain, Loh, N. Duane, Lorenzen, Kristina, Messerschmidt, Marc, Mühlig, Kerstin, Ourmazd, Abbas, Raab, Natascha, Rode, Andrei V., Rose, Max, Round, Adam, Sato, Takushi, Schubert, Robin, Schwander, Peter, Sellberg, Jonas A., Sikorski, Marcin, Silenzi, Alessandro, Song, Changyong, Spence, John C. H., Stern, Stephan, Sztuk-Dambietz, Jolanta, Teslyuk, Anthon, Timneanu, Nicusor, Trebbin, Martin, Uetrecht, Charlotte, Weinhausen, Britta, Williams, Garth J., Xavier, P. Lourdu, Xu, Chen, Vartanyants, Ivan A., Lamzin, Victor S., Mancuso, Adrian, and Maia, Filipe R. N. C.

Published
2020
Full Text
View/download PDF

33. Conversion of benzyl phenyl ether to monoaromatics in high-temperature aqueous ethanol solution under high-pressure carbon dioxide conditions.

Author

Taniguchi, Kenkichi, Kusumawati, Etty N., Nanao, Hidetaka, Rode, Chandrashekhar V., Sato, Osamu, Yamaguchi, Aritomo, and Shirai, Masayuki

Subjects
PHENYL ethers, BENZYL ethers, CARBON dioxide, AQUEOUS solutions, ETHANOL, BENZYL alcohol, LIGNIN structure, LIGNANS
Abstract

Solvolysis of benzyl phenyl ether (BPE), which is a model compound of lignin ether linkage, was studied in an aqueous ethanol solution, which can be obtained from bioethanol, under high-pressure carbon dioxide conditions. A batch study revealed that BPE solvolysis to monoaromatics (benzyl ethyl ether (BEE), benzyl alcohol (BA), and phenol (Ph)) proceeded in aqueous ethanol solution over 523 K and the addition of high-pressure carbon dioxide enhanced the initial solvolysis rate and suppressed the side reaction (hydrogenolysis to toluene (TL)). The ethanol molar fraction (ethanol–water volume ratio) is the key factor for the solvolysis reaction, and the highest monoaromatic yield of 72.9% (BEE 10.7%, BA 19.3%, Ph 37.9%, and TL 5.1%) was obtained in aqueous ethanol solution (2 cm3 : 1 cm3 = water:ethanol) at 598 K for 3 h under a pressure of 18 MPa of carbon dioxide. The solvolysis reaction proceeded continuously to produce monoaromatics with a flow system. A monoaromatic yield of 76.7% (BEE 8.6%, BA 19.7%, Ph 39.6%, and TL 8.9%) was obtained, and the formation rates were 2.7 × 10−4 mmol min−1 for BEE, 6.2 × 10−4 mmol min−1 for BA, and 12.4 × 10−4 mmol min−1 for Ph at 598 K under flowing water (26 mmol min−1), ethanol solution (4.1 mmol min−1), carbon dioxide (1.2 mmol min−1), and BPE (15.6 × 10−4 mmol min−1) under a total pressure of 40 MPa. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

36. Activity performance and kinetics for glycerol carbonylation with urea over Zn‐Co mixed metal oxide catalyst.

Author

Kondawar, Sharda E., Kasar, Gaytri B., Khatua, Angshuman S., and Rode, Chandrashekhar V.

Subjects
GLYCERIN, CARBONYLATION, METAL catalysts, METALLIC oxides, X-ray photoelectron spectroscopy, UREA, RAMAN spectroscopy
Abstract

Efficient carbonylation of glycerol using urea with Zn‐Co mixed metal oxide (MMO) catalyst has been achieved. Various methods of catalyst preparation were explored for glycerol carbonate (GC) synthesis. The optimized method of catalyst preparation was found to be co‐precipitation (CP) with a Zn:Co ratio of 70:30, achieving 81% glycerol conversion with 97% GC selectivity. X‐ray diffraction (XRD) studies revealed the formation of ZnO, Co3 O4, and spinel ZnCo2O4 phases. Thermal treatment given to the catalyst allows insertion of Zn cations into Co3O4 lattice forming ZnCo2O4 phase which was also evidenced in X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Herein, for the first time, reaction kinetics was studied to propose the rate equation, based on which a plausible reaction pathway is proposed involving two‐site adsorption of glycerol (basic site) and urea (acidic site), which undergo carbonylation followed by cyclization into GC. A recycle study and hot filtration test have proven the reusability of the catalyst. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

49. Enhanced anisole hydroxylation over a hierarchical micro/mesoporous TS-1 catalyst.

Author

Patil, Chetana R., Niphadkar, Prashant, Kamble, Sanjay P., and Rode, Chandrashekhar V.

Subjects
ANISOLE, HYDROXYLATION, CATALYSTS, CATALYTIC activity, MASS transfer
Abstract

Hierarchical TS-1 materials were synthesized using hydrothermal synthesis and a post modification technique through desilication. They were evaluated for hydroxylation of anisole to produce industrially important chemicals, o-methoxyphenol (OMP) and p-methoxyphenol (PMP). The detailed characterization of the prepared catalysts, such as morphology, structure, nature of Ti and surface area were obtained by SEM, HR-TEM, XRD, UV-VIS spectroscopy and the BET technique. The effects of various operational parameters such as substrate/H2O2 molar ratio, reaction temperature, catalyst concentration and solvent effect on the hydroxylation of anisole have been studied in detail. The microporous TS-1 catalyst showed 32% anisole conversion with 34% selectivity to PMP, while the micro/mesoporous DTS-1 catalyst showed enhanced activity for anisole hydroxylation, i.e. 54% conversion with 55% selectivity towards PMP. The increased framework Ti and improved accessibility of the active sites located in the channels of DTS-1, which permit the mass transfer of reactants, transition states and products from the mesopores of DTS-1, were responsible for the enhanced catalytic activity and selectivity towards p-methoxyphenol. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results