Search

Your search keyword '"Thommes, M."' showing total 316 results
Start Over Author "Thommes, M." Search Limiters Academic (Peer-Reviewed) Journals
316 results on '"Thommes, M."'

3. A reference high-pressure CH4 adsorption isotherm for zeolite Y: results of an interlaboratory study

Author

Nguyen, H. G. T., Sims, C. M., Toman, B., Horn, J., van Zee, R. D., Thommes, M., Ahmad, R., Denayer, J. F. M., Baron, G. V., Napolitano, E., Bielewski, M., Mangano, E., Brandani, S., Broom, D. P., Benham, M. J., Dailly, A., Dreisbach, F., Edubilli, S., Gumma, S., Möllmer, J., Lange, M., Tian, M., Mays, T. J., Shigeoka, T., Yamakita, S., Hakuman, M., Nakada, Y., Nakai, K., Hwang, J., Pini, R., Jiang, H., Ebner, A. D., Nicholson, M. A., Ritter, J. A., Farrando-Pérez, J., Cuadrado-Collados, C., Silvestre-Albero, J., Tampaxis, C., Steriotis, T., Řimnáčová, D., Švábová, M., Vorokhta, M., Wang, H., Bovens, E., Heymans, N., and De Weireld, G.

Published
2020
Full Text
View/download PDF

5. The relaxation behavior of supercooled and glassy imidacloprid.

Author

Mansuri, A., Münzner, P., Feuerbach, T., Vermeer, A. W. P., Hoheisel, W., Böhmer, R., Thommes, M., and Gainaru, C.

Subjects
IMIDACLOPRID, SUPERCOOLED liquids, GLASS transition temperature, MOLECULAR dynamics
Abstract

Employing dielectric spectroscopy, oscillatory shear rheology, and calorimetry, the present work explores the molecular dynamics of the widely used insecticide imidacloprid above and below its glass transition temperature. In its supercooled liquid regime, the applied techniques yield good agreement regarding the characteristic structural (alpha) relaxation times of this material. In addition, the generalized Gemant–DiMarzio–Bishop model provides a good conversion between the frequency-dependent dielectric and shear mechanical responses in its viscous state, allowing for an assessment of imidacloprid's molecular hydrodynamic radius. In order to characterize the molecular dynamics in its glassy regime, we employ several approaches. These include the application of frequency–temperature superposition (FTS) to its isostructural dielectric and rheological responses as well as use of dielectric and calorimetric physical aging and the Adam–Gibbs–Vogel model. While the latter approach and dielectric FTS provide relaxation times that are close to each other, the other methods predict notably longer times that are closer to those reflecting a complete recovery of ergodicity. This seemingly conflicting dissimilarity demonstrates that the molecular dynamics of glassy imidacloprid strongly depends on its thermal history, with high relevance for the use of this insecticide as an active ingredient in technological applications. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

6. A reference high-pressure CO2 adsorption isotherm for ammonium ZSM-5 zeolite: results of an interlaboratory study

Author

Nguyen, H. G. T., Espinal, L., van Zee, R. D., Thommes, M., Toman, B., Hudson, M. S. L., Mangano, E., Brandani, S., Broom, D. P., Benham, M. J., Cychosz, K., Bertier, P., Yang, F., Krooss, B. M., Siegelman, R. L., Hakuman, M., Nakai, K., Ebner, A. D., Erden, L., Ritter, J. A., Moran, A., Talu, O., Huang, Y., Walton, K. S., Billemont, P., and De Weireld, G.

Published
2018
Full Text
View/download PDF

14. Critical depletion of pure fluids in colloidal solids: Results of experiments on EURECA and grand canonical Monte Carlo simulations

Author

Thommes, M., Schoen, M., Findenegg, G. H., Araki, H., editor, Brézin, E., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Ratke, Lorenz, editor, Walter, Hannes, editor, and Feuerbacher, Berndt, editor

Published
1996
Full Text
View/download PDF

19. Correction to: A reference high-pressure CO2 adsorption isotherm for ammonium ZSM-5 zeolite: results of an interlaboratory study

Author

Nguyen, H. G. T., Espinal, L., van Zee, R. D., Thommes, M., Toman, B., Hudson, M. S. L., Mangano, E., Brandani, S., Broom, D. P., Benham, M. J., Cychosz, K., Bertier, P., Yang, F., Krooss, B. M., Siegelman, R. L., Hakuman, M., Nakai, K., Ebner, A. D., Erden, L., Ritter, J. A., Moran, A., Talu, O., Huang, Y., Walton, K. S., Billemont, P., and De Weireld, G.

Published
2018
Full Text
View/download PDF

35. DOE Chair of Excellence in Environmental Disciplines-Final Technical Report

Author

Kurunganty, Sastry, primary, Loran, Roberto, additional, Roque-Malherbe, Rolando, additional, Hijazi, Yazan, additional, Nieto, Santander, additional, Gomez, Will A., additional, Duconge, Jose, additional, Cotto, María del C., additional, Muniz, Carlos, additional, Diaz, Francisco J., additional, Neira, Carlos F., additional, Marquez, Francisco, additional, Del Valle, W., additional, and Thommes, M., additional

Published
2014
Full Text
View/download PDF

37. A reference high-pressure CH4 adsorption isotherm for zeolite Y: results of an interlaboratory study.

Author

Nguyen, H. G. T., Sims, C. M., Toman, B., Horn, J., van Zee, R. D., Thommes, M., Ahmad, R., Denayer, J. F. M., Baron, G. V., Napolitano, E., Bielewski, M., Mangano, E., Brandani, S., Broom, D. P., Benham, M. J., Dailly, A., Dreisbach, F., Edubilli, S., Gumma, S., and Möllmer, J.

Abstract

This paper reports the results of an international interlaboratory study led by the National Institute of Standards and Technology (NIST) on the measurement of high-pressure surface excess methane adsorption isotherms on NIST Reference Material RM 8850 (Zeolite Y), at 25 °C up to 7.5 MPa. Twenty laboratories participated in the study and contributed over one-hundred adsorption isotherms of methane on Zeolite Y. From these data, an empirical reference equation was determined, along with a 95% uncertainty interval (Uk=2). By requiring participants to replicate a high-pressure reference isotherm for carbon dioxide adsorption on NIST Reference Material RM 8852 (ZSM-5), this interlaboratory study also demonstrated the usefulness of reference isotherms in evaluating the performance of high-pressure adsorption experiments. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

41. DEM simulations of particle dynamics in a spheronization process to describe the pelletization mechanisms

Author

Weis, D., Thaete, D., Thommes, M., Antonyuk, S., Weis, D., Thaete, D., Thommes, M., and Antonyuk, S.

Abstract

Spheronization is an important process to produce pharmaceutical pellets with a narrow particle size distribution and a homogeneous outer particle surface. Thereby, cylindrical extrudates are rounded by different pelletization mechanisms [1]. These mechanisms are highly dependent on the particle dynamics in the spheronizer. Discrete Element Method simulations of the particle motions in a spheronizer were performed to study the particle dynamics. The elastic-plastic contact model used in the simulations was calibrated by experiments with spheronized pellets. The influence of different process conditions and particle properties on the particle kinematics and interactions was analyzed. Also a comparison of the simulation results with PIV measurementswas performed.

Published
2015

42. A reference high-pressure CO2 adsorption isotherm for ammonium ZSM-5 zeolite: results of an interlaboratory study.

Author

Nguyen, H. G. T., Espinal, L., van Zee, R. D., Thommes, M., Toman, B., Hudson, M. S. L., Mangano, E., Brandani, S., Broom, D. P., Benham, M. J., Cychosz, K., Bertier, P., Yang, F., Krooss, B. M., Siegelman, R. L., Hakuman, M., Nakai, K., Ebner, A. D., Erden, L., and Ritter, J. A.

Abstract

This paper reports the results of an international interlaboratory study led by the National Institute of Standards and Technology (NIST) on the measurement of high-pressure surface excess carbon dioxide adsorption isotherms on NIST Reference Material RM 8852 (ammonium ZSM-5 zeolite), at 293.15 K (20 °C) from 1 kPa up to 4.5 MPa. Eleven laboratories participated in this exercise and, for the first time, high-pressure adsorption reference data are reported using a reference material. An empirical reference equation nex=d(1+exp[-ln(P)+a/b])c, [nex-surface excess uptake (mmol/g), P-equilibrium pressure (MPa), a = −6.22, b = 1.97, c = 4.73, and d = 3.87] along with the 95% uncertainty interval (Uk = 2 = 0.075 mmol/g) were determined for the reference isotherm using a Bayesian, Markov Chain Monte Carlo method. Together, this zeolitic reference material and the associated adsorption data provide a means for laboratories to test and validate high-pressure adsorption equipment and measurements. Recommendations are provided for measuring reliable high-pressure adsorption isotherms using this material, including activation procedures, data processing methods to determine surface excess uptake, and the appropriate equation of state to be used. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

43. Carbide-derived carbon monoliths with hierarchical pore architectures

Author

Oschatz, M., Borchardt, L., Thommes, M., Cychosz, K.A., Senkovska, I., Klein, N., Frind, R., Leistner, M., Presser, V., Gogotsi, Y., Kaskel, S., and Publica

Subjects
polyHIPEs, adsorption, carbon, hierarchical structure, porous material
Abstract

Sierpinski carbon: Macroporous carbide-derived carbon monoliths (DUT-38) were synthesized starting from SiC-PolyHIPEs, resulting in a hierarchical micro-, meso-, and macroporous structure. The high specific surface area and high macropore volume renders PolyHIPE-CDC an excellent adsorbent combining high storage capacity with excellent adsorption rates in gas storage and air filtration.

Published
2012

44. Evolution of porosity in carbide-derived carbon aerogels

Author

Oschatz, M., Nickel, W., Thommes, M., Cychosz, K. A., Leistner, M., Adam, M., Mondin, G., Strubel, P., Borchardt, L., Kaskel, S., Oschatz, M., Nickel, W., Thommes, M., Cychosz, K. A., Leistner, M., Adam, M., Mondin, G., Strubel, P., Borchardt, L., and Kaskel, S.

Abstract

Carbide-derived carbon (CDC) aerogel monoliths with very high porosity are synthesized starting from polymeric precursors. Cross-linking by platinum-catalyzed hydrosilylation of polycarbosilanes followed by supercritical drying yields preceramic aerogels. After ceramic conversion and silicon extraction in hot chlorine gas, hierarchically porous carbon materials with specific surface areas as high as 2122 m² g⁻¹ and outstanding total pore volumes close to 9 cm³ g⁻¹ are obtained. Their pore structure is controllable by the applied synthesis temperature as shown by combined nitrogen (-196 °C) and carbon dioxide (0 °C) measurements coupled with electron microscopic methods. The combination of large micropore volumes and the aerogel-type pore system leads to advanced adsorption properties due to a combination of large storage capacities and effective materials transport in comparison with purely microporous reference materials as shown by thermal response measurements.

Published
2014

50. Hydrogen adsorption studies on single wall carbon nanotubes

Author

Consejo Superior de Investigaciones Científicas (España), Ansón Casaos, Alejandro, Callejas, María A., Benito, Ana M., Maser, Wolfgang K., Izquierdo Pantoja, María Teresa, Rubio Villa, Begoña, Jagiello, Jacek, Thommes, M., Parra Soto, José Bernardo, Martínez Fernández de Landa, María Teresa, Consejo Superior de Investigaciones Científicas (España), Ansón Casaos, Alejandro, Callejas, María A., Benito, Ana M., Maser, Wolfgang K., Izquierdo Pantoja, María Teresa, Rubio Villa, Begoña, Jagiello, Jacek, Thommes, M., Parra Soto, José Bernardo, and Martínez Fernández de Landa, María Teresa

Abstract

Hydrogen adsorption data on as-grown and heat-treated single walled carbon nanotubes (SWNTs) obtained by a volumetric procedure using a Quantachrome Autosorb-1 equipment are presented. The amounts of hydrogen adsorbed at atmospheric pressure reach approximately 0.01 wt.% at 298 K and 1 wt.% at 77 K. The isosteric heat of adsorption has been calculated for both samples from H2 equilibrium adsorption data at three temperatures, having initial values of 7.42 and 7.75 kJ mol−1. Studies in porous structure by N2 adsorption and density measurements in helium pycnometer are reported.

Published
2004

Catalog

Books, media, physical & digital resources
See catalog results