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Zhao Y, Otto SK, Lombardo T, Henss A, Koeppe A, Selzer M, Janek J, Nestler B. Identification of Lithium Compounds on Surfaces of Lithium Metal Anode with Machine-Learning-Assisted Analysis of ToF-SIMS Spectra. ACS Appl Mater Interfaces 2023; 15:50469-50478. [PMID: 37852613 PMCID: PMC10623505 DOI: 10.1021/acsami.3c09643] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 09/13/2023] [Indexed: 10/20/2023]
Abstract
Detailed knowledge about contamination and passivation compounds on the surface of lithium metal anodes (LMAs) is essential to enable their use in all-solid-state batteries (ASSBs). Time-of-flight secondary ion mass spectrometry (ToF-SIMS), a highly surface-sensitive technique, can be used to reliably characterize the surface status of LMAs. However, as ToF-SIMS data are usually highly complex, manual data analysis can be difficult and time-consuming. In this study, machine learning techniques, especially logistic regression (LR), are used to identify the characteristic secondary ions of 5 different pure lithium compounds. Furthermore, these models are applied to the mixture and LMA samples to enable identification of their compositions based on the measured ToF-SIMS spectra. This machine-learning-based analysis approach shows good performance in identifying characteristic ions of the analyzed compounds that fit well with their chemical nature. Moreover, satisfying accuracy in identifying the compositions of unseen new samples is achieved. In addition, the scope and limitations of such a strategy in practical applications are discussed. This work presents a robust analytical method that can assist researchers in simplifying the analysis of the studied lithium compound samples, offering the potential for broader applications in other material systems.
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Affiliation(s)
- Yinghan Zhao
- Institute
for Applied Materials − Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
| | - Svenja-K. Otto
- Institute
of Physical Chemistry, Justus-Liebig-Universität
Giessen, D-35392 Giessen, Germany
| | - Teo Lombardo
- Institute
of Physical Chemistry, Justus-Liebig-Universität
Giessen, D-35392 Giessen, Germany
| | - Anja Henss
- Institute
of Physical Chemistry, Justus-Liebig-Universität
Giessen, D-35392 Giessen, Germany
| | - Arnd Koeppe
- Institute
for Applied Materials − Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
| | - Michael Selzer
- Institute
for Applied Materials − Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute
for Digital Materials Science, Karlsruhe
University of Applied Sciences, D-76133 Karlsruhe, Germany
| | - Jürgen Janek
- Institute
of Physical Chemistry, Justus-Liebig-Universität
Giessen, D-35392 Giessen, Germany
| | - Britta Nestler
- Institute
for Applied Materials − Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute
for Digital Materials Science, Karlsruhe
University of Applied Sciences, D-76133 Karlsruhe, Germany
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2
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Grijalva Garces D, Strauß S, Gretzinger S, Schmieg B, Jüngst T, Groll J, Meinel L, Schmidt I, Hartmann H, Schenke-Layland K, Brandt N, Selzer M, Zimmermann S, Koltay P, Southan A, Tovar GEM, Schmidt S, Weber A, Ahlfeld T, Gelinsky M, Scheibel T, Detsch R, Boccaccini AR, Naolou T, Lee-Thedieck C, Willems C, Groth T, Allgeier S, Köhler B, Friedrich T, Briesen H, Buchholz J, Paulus D, von Gladiss A, Hubbuch J. On the reproducibility of extrusion-based bioprinting: round robin study on standardization in the field. Biofabrication 2023; 16:015002. [PMID: 37769669 DOI: 10.1088/1758-5090/acfe3b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 09/25/2023] [Indexed: 10/03/2023]
Abstract
The outcome of three-dimensional (3D) bioprinting heavily depends, amongst others, on the interaction between the developed bioink, the printing process, and the printing equipment. However, if this interplay is ensured, bioprinting promises unmatched possibilities in the health care area. To pave the way for comparing newly developed biomaterials, clinical studies, and medical applications (i.e. printed organs, patient-specific tissues), there is a great need for standardization of manufacturing methods in order to enable technology transfers. Despite the importance of such standardization, there is currently a tremendous lack of empirical data that examines the reproducibility and robustness of production in more than one location at a time. In this work, we present data derived from a round robin test for extrusion-based 3D printing performance comprising 12 different academic laboratories throughout Germany and analyze the respective prints using automated image analysis (IA) in three independent academic groups. The fabrication of objects from polymer solutions was standardized as much as currently possible to allow studying the comparability of results from different laboratories. This study has led to the conclusion that current standardization conditions still leave room for the intervention of operators due to missing automation of the equipment. This affects significantly the reproducibility and comparability of bioprinting experiments in multiple laboratories. Nevertheless, automated IA proved to be a suitable methodology for quality assurance as three independently developed workflows achieved similar results. Moreover, the extracted data describing geometric features showed how the function of printers affects the quality of the printed object. A significant step toward standardization of the process was made as an infrastructure for distribution of material and methods, as well as for data transfer and storage was successfully established.
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Affiliation(s)
- David Grijalva Garces
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
- Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Svenja Strauß
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
- Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Sarah Gretzinger
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
- Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Barbara Schmieg
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
- Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Tomasz Jüngst
- Department for Functional Materials in Medicine and Dentistry, Institute of Functional Materials and Biofabrication, University of Würzburg, Würzburg, Germany
- Bavarian Polymer Institute, University of Bayreuth, Bayreuth, Germany
| | - Jürgen Groll
- Department for Functional Materials in Medicine and Dentistry, Institute of Functional Materials and Biofabrication, University of Würzburg, Würzburg, Germany
- Bavarian Polymer Institute, University of Bayreuth, Bayreuth, Germany
| | - Lorenz Meinel
- Institute of Pharmacy and Food Chemistry, University of Würzburg, Würzburg, Germany
| | - Isabelle Schmidt
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
| | - Hanna Hartmann
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
| | - Katja Schenke-Layland
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
- Institute of Biomedical Engineering, Department for Medical Technologies and Regenerative Medicine, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Nico Brandt
- Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Michael Selzer
- Institute for Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Stefan Zimmermann
- Laboratory for MEMS Applications, Department of Microsystems Engineering, University of Freiburg, Freiburg, Germany
| | - Peter Koltay
- Laboratory for MEMS Applications, Department of Microsystems Engineering, University of Freiburg, Freiburg, Germany
| | - Alexander Southan
- Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany
- Functional Surfaces and Materials, Fraunhofer Institute for Interfacial Engineering and Biotechnology, Stuttgart, Germany
| | - Günter E M Tovar
- Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany
- Functional Surfaces and Materials, Fraunhofer Institute for Interfacial Engineering and Biotechnology, Stuttgart, Germany
| | - Sarah Schmidt
- Functional Surfaces and Materials, Fraunhofer Institute for Interfacial Engineering and Biotechnology, Stuttgart, Germany
| | - Achim Weber
- Functional Surfaces and Materials, Fraunhofer Institute for Interfacial Engineering and Biotechnology, Stuttgart, Germany
| | - Tilman Ahlfeld
- Center for Translational Bone, Joint, and Soft Tissue Research, Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Michael Gelinsky
- Center for Translational Bone, Joint, and Soft Tissue Research, Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Thomas Scheibel
- Bavarian Polymer Institute, University of Bayreuth, Bayreuth, Germany
- Chair of Biomaterials, University of Bayreuth, Bayreuth, Germany
| | - Rainer Detsch
- Institute of Biomaterials, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Toufik Naolou
- Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover, Germany
| | - Cornelia Lee-Thedieck
- Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover, Germany
| | - Christian Willems
- Department Biomedical Materials, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Thomas Groth
- Department Biomedical Materials, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Stephan Allgeier
- Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Bernd Köhler
- Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Tiaan Friedrich
- Process Systems Engineering, School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Heiko Briesen
- Process Systems Engineering, School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Janine Buchholz
- Institute for Computational Visualistics, Active Vision Group, University of Koblenz, Koblenz, Germany
| | - Dietrich Paulus
- Institute for Computational Visualistics, Active Vision Group, University of Koblenz, Koblenz, Germany
| | - Anselm von Gladiss
- Institute for Computational Visualistics, Active Vision Group, University of Koblenz, Koblenz, Germany
| | - Jürgen Hubbuch
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
- Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany
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Farzaneh Kalourazi S, Wang F, Zhang H, Selzer M, Nestler B. Phase-field simulation for the formation of porous microstructures due to phase separation in polymer solutions on substrates with different wettabilities. J Phys Condens Matter 2022; 34:444003. [PMID: 35985313 DOI: 10.1088/1361-648x/ac8b4d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
The porous microstructure has been widely observed in a variety of polymer solutions that have been broadly applied in many industry fields. Phase separation is one of the common mechanisms for the formation of the porous microstructure in binary polymeric mixtures. Previous studies for the formation of porous microstructures mostly focus on the separation of the bulk phase. However, there is a paucity of investigation for the phase separation of polymer mixtures contacting the solid substrate. When the polymeric liquid mixtures interact with the solid substrate, the wetting boundary condition has to be taken into account. In this work, we present a phase-field model which is coupled with the wetting boundary condition to study the phase separation in binary polymer solutions. Our consideration is based on the polymerization-induced phase separation, and thermally induced phase separation by using the Flory-Huggins model. By taking the wetting effect into account, we find that polymer droplets spontaneously occur in the microstructure, even though the bulk composition is outside the spinodal region. This phenomenon is caused by the surface composition resulting from the wetting effect that was often overlooked in literature. For the phase separation in the binary polymer mixture, we also study the impact of the temperature gradient on the microstructural evolution. The porosity, the number of droplets, and the mean radius of the droplets are rationalized with the temperature gradient.
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Affiliation(s)
- Saeideh Farzaneh Kalourazi
- Institute of Applied Materials-Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Straße am Forum 7, Karlsruhe 76131, Germany
| | - Fei Wang
- Institute of Applied Materials-Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Straße am Forum 7, Karlsruhe 76131, Germany
| | - Haodong Zhang
- Institute of Applied Materials-Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Straße am Forum 7, Karlsruhe 76131, Germany
| | - Michael Selzer
- Institute of Applied Materials-Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Straße am Forum 7, Karlsruhe 76131, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, Karlsruhe 76133, Germany
| | - Britta Nestler
- Institute of Applied Materials-Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Straße am Forum 7, Karlsruhe 76131, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, Karlsruhe 76133, Germany
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4
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Altschuh P, Kunz W, Bremerich M, Reiter A, Selzer M, Nestler B. Wicking in Porous Polymeric Membranes: Determination of an Effective Capillary Radius to Predict the Flow Behavior in Lateral Flow Assays. Membranes 2022; 12:membranes12070638. [PMID: 35877842 PMCID: PMC9318119 DOI: 10.3390/membranes12070638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/17/2022] [Accepted: 06/17/2022] [Indexed: 11/29/2022]
Abstract
The working principle of lateral flow assays, such as the widely used COVID-19 rapid tests, is based on the capillary-driven liquid transport of a sample fluid to a test line using porous polymeric membranes as the conductive medium. In order to predict this wicking process by simplified analytical models, it is essential to determine an effective capillary radius for the highly porous and open-pored membranes. In this work, a parametric study is performed with selected simplified structures, representing the complex microstructure of the membrane. For this, a phase-field approach with a special wetting boundary condition to describe the meniscus formation and the corresponding mean surface curvature for each structure setup is used. As a main result, an analytical correlation between geometric structure parameters and an effective capillary radius, based on a correction factor, are obtained. The resulting correlation is verified by applying image analysis methods on reconstructed computer tomography scans of two different porous polymeric membranes and thus determining the geometric structure parameters. Subsequently, a macroscale flow model that includes the correlated effective pore size and geometrical capillary radius is applied, and the results are compared with wicking experiments. Based on the derived correction function, it is shown that the analytical prediction of the wicking process in highly porous polymeric membranes is possible without the fitting of experimental wicking data. Furthermore, it can be seen that the estimated effective pore radius of the two membranes is 8 to 10 times higher than their geometric mean pore radii.
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Affiliation(s)
- Patrick Altschuh
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
- Correspondence: (P.A.); (W.K.)
| | - Willfried Kunz
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Correspondence: (P.A.); (W.K.)
| | - Marcel Bremerich
- Sartorius Stedim Biotech GmbH, August-Spindler-Strasse 11, 37079 Goettingen, Germany;
| | - Andreas Reiter
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
| | - Michael Selzer
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
| | - Britta Nestler
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
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5
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Garabedian NT, Schreiber PJ, Brandt N, Zschumme P, Blatter IL, Dollmann A, Haug C, Kümmel D, Li Y, Meyer F, Morstein CE, Rau JS, Weber M, Schneider J, Gumbsch P, Selzer M, Greiner C. Generating FAIR research data in experimental tribology. Sci Data 2022. [PMCID: PMC9203546 DOI: 10.1038/s41597-022-01429-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Solutions for the generation of FAIR (Findable, Accessible, Interoperable, and Reusable) data and metadata in experimental tribology are currently lacking. Nonetheless, FAIR data production is a promising path for implementing scalable data science techniques in tribology, which can lead to a deeper understanding of the phenomena that govern friction and wear. Missing community-wide data standards, and the reliance on custom workflows and equipment are some of the main challenges when it comes to adopting FAIR data practices. This paper, first, outlines a sample framework for scalable generation of FAIR data, and second, delivers a showcase FAIR data package for a pin-on-disk tribological experiment. The resulting curated data, consisting of 2,008 key-value pairs and 1,696 logical axioms, is the result of (1) the close collaboration with developers of a virtual research environment, (2) crowd-sourced controlled vocabulary, (3) ontology building, and (4) numerous – seemingly – small-scale digital tools. Thereby, this paper demonstrates a collection of scalable non-intrusive techniques that extend the life, reliability, and reusability of experimental tribological data beyond typical publication practices.
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6
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Wu Y, Kuzina M, Wang F, Reischl M, Selzer M, Nestler B, Levkin PA. Equilibrium droplet shapes on chemically patterned surfaces: theoretical calculation, phase-field simulation, and experiments. J Colloid Interface Sci 2022; 606:1077-1086. [PMID: 34487930 DOI: 10.1016/j.jcis.2021.08.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/27/2021] [Accepted: 08/05/2021] [Indexed: 01/28/2023]
Abstract
HYPOTHESIS Droplet wetting on a solid substrate is affected by the surface heterogeneity. Introducing patterned wettability on the solid substrate is expected to engender anisotropic wetting morphologies, thereby manipulating droplet wetting behaviors. However, when the droplet size is comparable with that of the surface heterogeneity, the wetting morphologies cannot be depicted by the quintessential Cassie's theory but should be possible to be predicted from the perspective of thermodynamics via surface energy minimization. METHODS Here, we investigate the equilibrium droplet shapes on chemically patterned substrates by using an analytical model, phase-field simulations, and experiments. The former two methods are sharp and diffuse interface treatments, respectively, which both are based on minimizing the free energy of the system. The experimental results are obtained by depositing droplets on chemically patterned glass substrates. FINDINGS Various anisotropic wetting shapes are found from the three methods. Excellent agreement is observed between different methods, showing the possibility to quantify the anisotropic wetting droplet morphologies on patterned substrates by present methods. We also address a series of non-rotationally symmetric droplet shapes, which is the first resport about these special wetting morphologies. Furthermore, we reveal the anisotropic wetting shapes in a quasi-equilibrium evaporation process.
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Affiliation(s)
- Yanchen Wu
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany
| | - Mariia Kuzina
- Institute of Biological and Chemical Systems, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Pl. 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Fei Wang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany.
| | - Markus Reischl
- Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Pl. 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Michael Selzer
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany; Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
| | - Britta Nestler
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany; Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany.
| | - Pavel A Levkin
- Institute of Biological and Chemical Systems, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Pl. 1, 76344 Eggenstein-Leopoldshafen, Germany; Institute of Organic Chemistry, Karlsruhe Institute of Technology, Kaiserstraße 12, 76131 Karlsruhe, Germany.
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7
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Abstract
By utilizing a proposed analytical model in combination with the phase-field method, we present a comprehensive study on the effect of chemical patterns on equilibrium droplet morphologies. Here, three influencing factors, the droplet sizes, contact angles, and the ratios of the hydrophilic area to the hydrophobic area, are contemplated. In the analytical model, chemical heterogeneities are described by different non-linear functions. By tuning these functions and the related parameters, the analytical model is capable of calculating the energy landscapes of the system. The chemically patterned surfaces display complex energy landscapes with chemical-heterogeneity-induced local minima, which correspond to the equilibrium morphologies of the droplets. Phase-field (PF) simulations are accordingly conducted and compared with the predicted equilibrium morphologies. In addition, we propose a modified Cassie-Baxter (CB) model to delineate the equilibrium droplet shapes. In contrast to the classic CB model, our extension is not only restricted to the shape with a spherical cap. Both the energy landscape method and the modified CB model are demonstrated to have a good agreement with the PF simulations.
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Affiliation(s)
- Yanchen Wu
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany.
| | - Fei Wang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany.
| | - Shaoping Ma
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany.
| | - Michael Selzer
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany. and Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
| | - Britta Nestler
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany. and Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
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8
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Subhedar A, Reiter A, Selzer M, Varnik F, Nestler B. Interface tracking characteristics of color-gradient lattice Boltzmann model for immiscible fluids. Phys Rev E 2020; 101:013313. [PMID: 32069649 DOI: 10.1103/physreve.101.013313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Indexed: 06/10/2023]
Abstract
We study the interface tracking characteristics of a color-gradient-based lattice Boltzmann model for immiscible flows. Investigation of the local density change in one of the fluid phases, via a Taylor series expansion of the recursive lattice Boltzmann equation, leads to the evolution equation of the order parameter that differentiates the fluids. It turns out that this interface evolution follows a conservative Allen-Cahn equation with a mobility which is independent of the fluid viscosities and surface tension. The mobility of the interface, which solely depends upon lattice speed of sound, can have a crucial effect on the physical dynamics of the interface. Further, we find that, when the equivalent lattice weights inside the segregation operator are modified, the resulting differential operators have a discretization error that is anisotropic to the leading order. As a consequence, the discretization errors in the segregation operator, which ensures a finite interface width, can act as a source of the spurious currents. These findings are supported with the help of numerical simulations.
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Affiliation(s)
- A Subhedar
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
| | - A Reiter
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
| | - M Selzer
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany
| | - F Varnik
- Interdisciplinary Centre for Advanced Materials Simulation, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
| | - B Nestler
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany
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9
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Abstract
Droplet wetting on solid surfaces is a ubiquitous phenomenon in nature and applications. The wetting behavior of droplets on homogeneous surfaces has been accurately elucidated by the quintessential Young's law. However, on heterogeneous substrates, due to the energy barriers and contact line pinning effect, more than one equilibrated droplet pattern exists, which is more close to reality. Here, we propose a concise mathematical-physical model to delineate the droplet patterns on chemically patterned surfaces: stripe, "chocolate," and "chessboard." The present concept is capable of predicting the number as well as the morphologies of the equilibrated droplets on chemically patterned surfaces. We anticipate that the current work can be applied to fabricate programmable surfaces involving droplet manipulation in integrated circuits, biochips, and smart microelectronics.
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Affiliation(s)
- Yanchen Wu
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany
| | - Fei Wang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany
| | - Michael Selzer
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany and Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
| | - Britta Nestler
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology, Straße am Forum 7, 76131 Karlsruhe, Germany and Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
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10
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Wu Y, Wang F, Selzer M, Nestler B. Investigation of Equilibrium Droplet Shapes on Chemically Striped Patterned Surfaces Using Phase-Field Method. Langmuir 2019; 35:8500-8516. [PMID: 31149828 DOI: 10.1021/acs.langmuir.9b01362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We systematically investigate the equilibrium shapes of droplets deposited on a set of chemically striped patterned surfaces by using an Allen?Cahn-type phase-field model. Varying the widths of the stripes d, the volume V, as well as the initial positions of the droplets, we release the droplets on the top of the surfaces and observe the final droplet shapes. It is found that there are either one or two equilibrium shapes for a fixed ratio of d/ V1/3 and each equilibrium shape corresponds to an energy minimum state. The aspect ratio of the droplets ? shows a periodic oscillation behavior with a decreasing amplitude as d/ V1/3 decreases, similar to the stick?slip?jump movement of a slowly condensing droplet on a chemically striped patterned surface. Additionally, by comparing the movements of slowly evaporating and condensing droplets, we have observed a hysteresis phenomenon, which reveals that the final shapes of droplets also rely on the moving paths. Through modifying the dynamic contact angle boundary condition, the contact line movements of droplets under condensation and evaporation, which are far from equilibrium, are addressed.
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Affiliation(s)
- Yanchen Wu
- Institute of Applied Materials?Computational Materials Science , Karlsruhe Institute of Technology , Stra?e am Forum 7 , 76131 Karlsruhe , Germany
| | - Fei Wang
- Institute of Applied Materials?Computational Materials Science , Karlsruhe Institute of Technology , Stra?e am Forum 7 , 76131 Karlsruhe , Germany
| | - Michael Selzer
- Institute of Applied Materials?Computational Materials Science , Karlsruhe Institute of Technology , Stra?e am Forum 7 , 76131 Karlsruhe , Germany
- Institute of Digital Materials Science , Karlsruhe University of Applied Sciences , Moltkestra?e 30 , 76133 Karlsruhe , Germany
| | - Britta Nestler
- Institute of Applied Materials?Computational Materials Science , Karlsruhe Institute of Technology , Stra?e am Forum 7 , 76131 Karlsruhe , Germany
- Institute of Digital Materials Science , Karlsruhe University of Applied Sciences , Moltkestra?e 30 , 76133 Karlsruhe , Germany
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Wang F, Altschuh P, Ratke L, Zhang H, Selzer M, Nestler B. Progress Report on Phase Separation in Polymer Solutions. Adv Mater 2019; 31:e1806733. [PMID: 30856293 DOI: 10.1002/adma.201806733] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/22/2018] [Indexed: 05/11/2023]
Abstract
Polymeric porous media (PPM) are widely used as advanced materials, such as sound dampening foams, lithium-ion batteries, stretchable sensors, and biofilters. The functionality, reliability, and durability of these materials have a strong dependence on the microstructural patterns of PPM. One underlying mechanism for the formation of porosity in PPM is phase separation, which engenders polymer-rich and polymer-poor (pore) phases. Herein, the phase separation in polymer solutions is discussed from two different aspects: diffusion and hydrodynamic effects. For phase separation governed by diffusion, two novel morphological transitions are reviewed: "cluster-to-percolation" and "percolation-to-droplets," which are attributed to an effect that the polymer-rich and the solvent-rich phases reach the equilibrium states asynchronously. In the case dictated by hydrodynamics, a deterministic nature for the microstructural evolution during phase separation is scrutinized. The deterministic nature is caused by an interfacial-tension-gradient (solutal Marangoni force), which can lead to directional movement of droplets as well as hydrodynamic instabilities during phase separation.
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Affiliation(s)
- Fei Wang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
| | - Patrick Altschuh
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133, Karlsruhe, Germany
| | - Lorenz Ratke
- Institute of Materials Research, German Aerospace Center (DLR), Linder Hoehe, 51147, Cologne, Germany
| | - Haodong Zhang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
| | - Michael Selzer
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133, Karlsruhe, Germany
| | - Britta Nestler
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133, Karlsruhe, Germany
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Ley A, Altschuh P, Thom V, Selzer M, Nestler B, Vana P. Characterization of a macro porous polymer membrane at micron-scale by Confocal-Laser-Scanning Microscopy and 3D image analysis. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.07.062] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Selzer M. Experimental neurorehabilitation training. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Altschuh P, Yabansu YC, Hötzer J, Selzer M, Nestler B, Kalidindi SR. Data science approaches for microstructure quantification and feature identification in porous membranes. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.06.020] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Dyachenko V, Steinmann M, Bangoura B, Selzer M, Munderloh U, Daugschies A, Barutzki D. Co-infection of Trypanosoma pestanai and Anaplasma phagocytophilum in a dog from Germany. Vet Parasitol Reg Stud Reports 2017; 9:110-114. [PMID: 31014832 DOI: 10.1016/j.vprsr.2017.06.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 05/31/2017] [Accepted: 06/03/2017] [Indexed: 10/19/2022]
Abstract
Infections with arthropod-borne pathogens are an increasing threat world-wide that requires heightened vigilance from veterinary and medical practitioners, especially when they involve new or unusual organisms. A dog was presented to a local veterinary clinic in Germany with malaise, pale mucous membranes and stiff joints. Clinical assessment revealed pyrexia, leukopenia and thrombocytopenia. On suspicion of a tick-borne infection, blood samples were examined for clinical and biochemical parameters and subjected to a Anaplasma phagocytophilum-, Borrelia spp.- and Ehrlichia canis-specific real-time PCR. Additionally, a sample of the pre-therapeutic buffy coat was co-cultured with the Ixodes scapularis cell-line ISE6 for 20days. Only the PCR specific for A. phagocytophilum DNA yielded a positive result, and furthermore, Anaplasma morulae were visible in granulocytes and tick cells. After co-culturing, extracellular trypomastigote and epimastigote stages of Trypanosoma sp. with an average length of 29.7μm were observed, featuring a pointed posterior end. Sequence analysis of a 2080bp fragment of the 18S rRNA gene showed 99% identity to the 18S rRNA gene of Trypanosoma pestanai, previously described from a European badger (Meles meles) in France. The dog's condition improved rapidly in response to doxycycline treatment for three weeks. The clinical status normalized and clinical blood parameters were found to be within the reference ranges. To our knowledge this is the first description of T. pestanai infection in a dog, the first detection of T. pestanai in Germany and the first documented co-infection with these two pathogens. Co-infections with unusual opportunistic vector-borne pathogens should be considered, if acute canine granulocytic anaplasmosis is evident.
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Affiliation(s)
- V Dyachenko
- Veterinary Laboratory Freiburg, BioTech Park, Engesserstr. 4b, 79108 Freiburg i. Br., Germany.
| | - M Steinmann
- Veterinary Clinic Selzer, Ippendorfer Allee 14d, 53127 Bonn, Germany
| | - B Bangoura
- Institute of Parasitology, Leipzig University, An den Tierkliniken 35, 04103 Leipzig, Germany
| | - M Selzer
- Veterinary Clinic Selzer, Ippendorfer Allee 14d, 53127 Bonn, Germany
| | - U Munderloh
- Department of Entomology, University of Minnesota, 219 Hodson Hall, 1980 Folwell Avenue, St. Paul, MN 55108, USA
| | - A Daugschies
- Institute of Parasitology, Leipzig University, An den Tierkliniken 35, 04103 Leipzig, Germany
| | - D Barutzki
- Veterinary Laboratory Freiburg, BioTech Park, Engesserstr. 4b, 79108 Freiburg i. Br., Germany
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Mukherjee A, Ankit K, Reiter A, Selzer M, Nestler B. Electric-field-induced lamellar to hexagonally perforated lamellar transition in diblock copolymer thin films: kinetic pathways. Phys Chem Chem Phys 2016; 18:25609-25620. [PMID: 27722519 DOI: 10.1039/c6cp04903f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Symmetric block-copolymers, hitherto, are well known to evolve into parallel, perpendicular and mixed lamellar morphologies under the concomitant influence of an electric field and substrate affinity. In the present work, we show that an additional imposed confinement can effectuate a novel parallel lamellar to hexagonally perforated lamellar (HPL) transition in monolayer and bilayer films. Three dimensional numerical studies are performed using the Ohta-Kawasaki functional, complemented with an exact solution of Maxwell's equation. HPL is shown to stabilize at large substrate affinity in a narrow region of the phase diagram between parallel and perpendicular lamellar transitions in ultra-thin films. Additionally, we also identify perforated lamellae as intermediate structures during parallel-to-perpendicular lamellar transition. A systematic analysis using Minkowski functionals yields deeper insights into the associated kinetic pathways.
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Affiliation(s)
- Arnab Mukherjee
- Institute of Materials and Processes, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133, Karlsruhe, Germany. and Institute of Applied Materials - Computational Materials Science, Karlsruhe Institute of Technology, Haid-und-Neu str. 7, 76131, Karlsruhe, Germany
| | - Kumar Ankit
- Institute of Applied Materials - Computational Materials Science, Karlsruhe Institute of Technology, Haid-und-Neu str. 7, 76131, Karlsruhe, Germany
| | - Andreas Reiter
- Institute of Applied Materials - Computational Materials Science, Karlsruhe Institute of Technology, Haid-und-Neu str. 7, 76131, Karlsruhe, Germany
| | - Michael Selzer
- Institute of Materials and Processes, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133, Karlsruhe, Germany. and Institute of Applied Materials - Computational Materials Science, Karlsruhe Institute of Technology, Haid-und-Neu str. 7, 76131, Karlsruhe, Germany
| | - Britta Nestler
- Institute of Materials and Processes, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133, Karlsruhe, Germany. and Institute of Applied Materials - Computational Materials Science, Karlsruhe Institute of Technology, Haid-und-Neu str. 7, 76131, Karlsruhe, Germany
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Ben Said M, Selzer M, Nestler B, Braun D, Greiner C, Garcke H. A phase-field approach for wetting phenomena of multiphase droplets on solid surfaces. Langmuir 2014; 30:4033-4039. [PMID: 24673164 DOI: 10.1021/la500312q] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We study the equilibrium wetting behavior of immiscible multiphase systems on a flat, solid substrate. We present numerical computations which are based on a vector-valued multiphase-field model of Allen-Cahn type, with a new boundary condition, based on appropriately designed surface energy contributions in order to ensure the right contact angles at multiphase junctions. Experimental investigations are carried out to validate the method and to support the numerical results.
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Affiliation(s)
- Marouen Ben Said
- Institute of Applied Materials, Karlsruhe Institute of Technology , 76131 Karlsruhe, Germany
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Wang F, Choudhury A, Selzer M, Mukherjee R, Nestler B. Effect of solutal Marangoni convection on motion, coarsening, and coalescence of droplets in a monotectic system. Phys Rev E Stat Nonlin Soft Matter Phys 2012; 86:066318. [PMID: 23368049 DOI: 10.1103/physreve.86.066318] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Indexed: 05/26/2023]
Abstract
In this paper, we study the effect of solutal Marangoni convection (SMC) on the microstructure evolution in a monotectic system, using the convective Cahn-Hilliard and Navier-Stokes equations with a capillary tensor contributed by the chemical concentration gradient. At first, we simulate the spontaneous motion of two distant droplets induced by SMC and compare our results with an analytical solution. We then compute the coalescence of two droplets in contact and coarsening of two distant droplets considering different sizes. We further study the influence of SMC on the evolution of phase separation processes inside the spinodal region for Fe-50 at %Sn and Fe-40 at %Sn alloys. In the former case, we rationalize our results using Fourier spectra and in the latter case, we compare the size distribution of droplets with the LSW theory.
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Affiliation(s)
- F Wang
- Institute of Materials and Processes, Karlsruhe University of Applied Sciences, Moltkestrasse 30, 76133 Karlsruhe, Germany.
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Weber U, Reitinger A, Erdeii T, Hellmich C, Steinlechner B, Hager H, Selzer M, Hiesmayr M, Rajek A, Kober A. Effects of high-urgency ambulance transportation on pro-B-type natriuretic peptide levels in patients with heart failure. Am J Emerg Med 2010; 28:568-76. [DOI: 10.1016/j.ajem.2008.12.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Revised: 12/17/2008] [Accepted: 12/19/2008] [Indexed: 11/26/2022] Open
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Abstract
To investigate the local properties of heterogeneous nuclei on substrates, a phase-field model is extended to incorporate volume constraints and a third order line tension in the gradient free energy density formulation. The new model is applied to sessile drop simulations of Cu nuclei on Ni substrates to precisely analyse 3D equilibrium shapes and diffusion processes across the phase boundaries. In particular, the formalism with higher order potentials is used to investigate the length-scale dependent effect of the line tension on Young's force balance at triple lines in 3D. The employment of parallel and adaptive simulation techniques is essential for three-dimensional numerical computations. Early stage solidification microstructures of cubic Ni crystals are simulated by scale-bridging molecular dynamics (MD) and phase-field (PF) simulations. The domain of the PF computations is initialized by transferring MD data of the atomic positions and of the shape of the nuclei. The combined approach can be used to study the responses of microstructures upon nucleation.
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Affiliation(s)
- B Nestler
- Institute of Materials and Processes (IMP), Karlsruhe University of Applied Sciences, Moltkestrasse 30, 76133 Karlsruhe, Germany
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Capri G, Chang J, Chen SC, Conte P, Cwiertka K, Jerusalem G, Jiang Z, Johnston S, Kaufman B, Link J, Ro J, Schütte J, Oliva C, Parikh R, Preston A, Rosenlund J, Selzer M, Zembryki D, De Placido S. An open-label expanded access study of lapatinib and capecitabine in patients with HER2-overexpressing locally advanced or metastatic breast cancer. Ann Oncol 2009; 21:474-480. [PMID: 19815649 DOI: 10.1093/annonc/mdp373] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The Lapatinib Expanded Access Program (LEAP) was designed to provide access to lapatinib plus capecitabine for HER2-positive metastatic breast cancer patients who previously received an anthracycline, a taxane, and a trastuzumab and had no other treatment options. PATIENTS AND METHODS LEAP opened globally and enrollment continued until lapatinib received regulatory approval in each participating country. Patients were assessed for progression-free survival (PFS) and overall survival (OS) and monitored for serious adverse events (SAEs). RESULTS As of 30 September 2008, 4283 patients from 45 countries enrolled in LEAP. The median treatment duration was 24.7 weeks. The most common drug-related SAEs were diarrhea (9.7%), vomiting (4.3%), and nausea (2.4%) and were mainly grade 3 or higher. The incidences of special interest SAEs were decreased left ventricle ejection fraction (0.5%), interstitial lung disease/pneumonitis (0.2%), and serious hepatobiliary events (0.4%). This safety profile is consistent with the overall lapatinib program. The median PFS and OS were 21.1 [95% confidence interval (CI) = 20.1-22.3] and 39.6 (95% CI = 37.7-40.7) weeks, respectively (n = 4006). Subgroup analysis showed longer PFS and OS in patients who had not received prior capecitabine. CONCLUSIONS These results demonstrate the safety and efficacy of lapatinib in a broader patient population compared with a clinical trial.
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Affiliation(s)
- G Capri
- Department of Medical Oncology, Fondazione IRCCS Istituto Tumori, Milano, Italy.
| | - J Chang
- Medical Oncology Program, RS McLaughlin Durham Regional Cancer Centre, Oshawa, Ontario, Canada
| | - S-C Chen
- Department of General Surgery, Chang Gung Memorial Hospital, Taipei, Taiwan
| | - P Conte
- Department of Oncology and Hematology, Universita degli Studi di Modena e Reggio Emilia, Modena, Italy
| | - K Cwiertka
- Department of Oncology, Hospital Olomouc, Olomouc, Czech Republic
| | - G Jerusalem
- Department of Medical Oncology, CHU Liège Hospital du Sart-Tilman, Liège, Belgium
| | - Z Jiang
- Breast Cancer Department, The Hospital Associated With Military Medical Science, Beijing, China
| | - S Johnston
- Department of Medical Oncology, Royal Marsden NHS Foundation Trust & Institute of Cancer Research, London, UK
| | - B Kaufman
- Breast Cancer Unit, Sheba Medical Center, Ramat Gan, Israel
| | - J Link
- Breast Link Medical Group, Inc., Long Beach, CA, USA
| | - J Ro
- Breast and Endocrine Cancer Branch, National Cancer Center, Kyunggi-do, South Korea
| | - J Schütte
- Department of Hematology and Oncology, Marien Hospital Düsseldorf, Düsseldorf, Germany
| | - C Oliva
- Oncology Medicine Development Center, GlaxoSmithKline, Uxbridge, Middlesex, UK
| | - R Parikh
- Oncology Medicine Development Center, GlaxoSmithKline, Uxbridge, Middlesex, UK
| | - A Preston
- Oncology Medicine Development Center, GlaxoSmithKline, Collegeville, PA, USA
| | - J Rosenlund
- Oncology Medicine Development Center, GlaxoSmithKline, Collegeville, PA, USA
| | - M Selzer
- Oncology, Global Clinical Safety and Pharmacovigilance, GlaxoSmithKline, Collegeville, PA, USA
| | - D Zembryki
- Oncology Medicine Development Center, GlaxoSmithKline, Collegeville, PA, USA
| | - S De Placido
- Department of Molecular and Clinical Oncology, Universita degli Studi di Napoli Federico II, Napoli, Italy
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Weber U, Reitinger A, Szusz R, Hellmich C, Steinlechner B, Hager H, Mora B, Selzer M, Hiesmayr M, Kober A. Emergency ambulance transport induces stress in patients with acute coronary syndrome. Emerg Med J 2009; 26:524-8. [DOI: 10.1136/emj.2008.059212] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Nestler B, Wendler F, Selzer M, Stinner B, Garcke H. Phase-field model for multiphase systems with preserved volume fractions. Phys Rev E Stat Nonlin Soft Matter Phys 2008; 78:011604. [PMID: 18763965 DOI: 10.1103/physreve.78.011604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Revised: 06/10/2008] [Indexed: 05/26/2023]
Abstract
We report on an interesting formulation of a phase-field model which incorporates a description of individual phases and particles with preserved volume evolving in a system of multiple phases such that the interfacial energy decreases. In our model, an antiforcing free energy density is defined to fulfill constraints on selected volume fractions by counterbalancing phase changes. Phases are defined as regions with energy bearing boundaries that may differ in their physical states, i.e., the regions may be distinguished in structure (crystal transformations), in composition (alloys, mixtures of fluids), or in the orientation of the crystal lattice (grains). The method allows one to simulate the formation of equilibrium crystal shapes and of the migration of inert particles and phases in microstructures. We show two- and three-dimensional simulations of bubble ensembles and foam textures and demonstrate the excellent agreement of crystal morphology configurations with analytical results.
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Affiliation(s)
- Britta Nestler
- Institute of Computational Engineering, Karlsruhe University of Applied Sciences, Moltkestrasse 30, Karlsruhe, Germany
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Selzer M, Zhang G, Jin L. Article 1. Arch Phys Med Rehabil 2006. [DOI: 10.1016/j.apmr.2006.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Selzer M. The Sea Lamprey: What This Primitive Animal Can Teach Us About the Potential for Repair of the Injured Spinal Cord. Top Spinal Cord Inj Rehabil 2003. [DOI: 10.1310/8hkb-ggpq-7ed1-3va5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Selzer M, Wangh M, Stierlin H, Loewenberg P. Psychistorical approaches to the study of Nazism. J Psychohist 2001; 4:215-30. [PMID: 11609921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Afonso AA, Sobrin L, Monroy DC, Selzer M, Lokeshwar B, Pflugfelder SC. Tear fluid gelatinase B activity correlates with IL-1alpha concentration and fluorescein clearance in ocular rosacea. Invest Ophthalmol Vis Sci 1999; 40:2506-12. [PMID: 10509643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
PURPOSE To correlate tear fluorescein clearance with interleukin-1alpha (IL-1alpha) concentration and gelatinase B (matrix metalloproteinase [MMP]-9) activity in the tear fluid of patients with ocular rosacea and normal control subjects. METHODS Gelatinase activity was evaluated by gelatin zymography in tear fluid obtained from 13 patients with ocular rosacea (including 1 patient with recurrent epithelial erosion, 2 with recurrent peripheral corneal infiltrates and vascularization, and 2 patients with epithelial basement membrane dystrophy) and 13 normal subjects with normal aqueous tear production and no irritation symptoms. Tear fluorescein clearance was evaluated by measuring fluorescence in tear fluid collected from the inferior meniscus 15 minutes after instillation of 5 microl of 2% Na-fluorescein with a CytoFluor II fluorometer. Pro-MMP-9 and IL-1alpha concentrations in the tear fluid were measured by enzyme-linked immunosorbent assay (ELISA). RESULTS Compared with normal control subjects, patients with ocular rosacea had a greater delay of tear fluorescein clearance (P < 0.001), a higher tear IL-1alpha concentration (P < 0.001), and a greater pro-gelatinase B (92 kDa) activity (P < 0.001) in their tear fluid. The 84-kDa active form of gelatinase B was observed in 46% of the rosacea tear samples and none of the controls. The zymographic results were confirmed by ELISA that showed a significantly greater concentration of pro-MMP-9 (92 kDa) in the tear fluid of rosacea patients than controls. Delayed tear clearance was correlated with elevated tear IL-1alpha concentration (p=0.67, P < 0.001) and increased tear gelatinase B activity (p=0.84, P < 0.001). Tear IL-1alpha concentration was correlated with tear gelatinase B activity (p=0.58, P < 0.002). CONCLUSIONS Gelatinase B (MMP-9) activity is greater in patients with ocular rosacea than in normal eyes. The majority of this activity is due to 92-kDa proform of this enzyme. This activity is correlated with delayed tear clearance and tear fluid concentration of interleukin-1alpha, a proinflammatory cytokine that has been reported to stimulate gelatinase B production. Elevated gelatinase B activity in ocular rosacea may be involved in the pathogenesis of the irritation symptoms, recurrent epithelial erosions, vascularization, and epithelial basement membrane dystrophy that develops in the corneas of patients with this condition.
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Affiliation(s)
- A A Afonso
- Ocular Surface and Tear Center, Bascom Palmer Eye Institute, Miami, FL 33136, USA
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Aisen M, Rosen M, Dobkin B, Selzer M, Laven L, Wessel T, Giesser B, Sparr S, Lennihan L. Position Paper: ASNR Scientific Issues Committee 1995. Neurorehabil Neural Repair 1996. [DOI: 10.1177/154596839601000101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
A pilot study on the process of psychodynamic psychotherapy of borderline personality disorder at the Cornell University Medical College is designed to investigate the teaching and application of a specific model of treatment for borderline patients (Clarkin et al. 1992; Kernberg and Clarkin 1992). The project has involved teaching a group of self-selected trainees and faculty the manualized therapy (Kernberg et al. 1989); taping each of the twice-weekly therapy sessions over a period of 2 years; and rating (1) each therapist's adherence to the manual (Koenigsberg et al. 1985), (2) each therapist's skill, and (3) patient change. The patients are women with borderline personality disorder, between 20 and 40 years of age, diagnosed by DSM-III-R criteria (American Psychiatric Association 1987), SCID-II (Spitzer et al. 1987), and a self-report questionnaire for level of personality organization. At regular intervals, the patients are evaluated for symptom status, change in BPD criteria, and functioning. The therapists are evaluated for adherence to the manual and level of therapeutic skill. In teaching and carrying out the manualized therapy, it became clear that a critical moment in the treatment was the setting up of the treatment contract. A study was organized to look systematically at the adherence of the therapists to the model of treatment with regard to this initial phase of the therapy.
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Affiliation(s)
- F Yeomans
- Department of Psychiatry, New York Hospital-Cornell Medical Center, White Plains 10605
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Yeomans F, Selzer M, Clarkin J. Response to Soloff. Psychiatry 1993; 56:268-269. [PMID: 27707113 DOI: 10.1080/00332747.1993.11024644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Koenigsberg HW, Kernberg OF, Haas G, Lotterman A, Rockland L, Selzer M. Development of a scale for measuring techniques in the psychotherapy of borderline patients. J Nerv Ment Dis 1985; 173:424-31. [PMID: 4009159 DOI: 10.1097/00005053-198507000-00006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Studies of psychodynamic psychotherapy require an instrument to measure the application of the prescribed therapeutic techniques during ongoing treatment. The authors describe the development of such an instrument, the Therapist Verbal Intervention Inventory (TVII), designed specifically for use in the study of the treatment of patients with borderline personality disorders. The TVII was designed, in addition, to test the hypothesis that psychodynamic techniques defined at a middle level of inference could be reliably rated by trained clinicians. The authors present data on the inter-rater reliabilities and inter-rater agreements obtainable with the TVII in the hands of highly experienced clinicians and in the hands of an independent group of junior clinicians trained in its use. The TVII appears to be a potentially useful tool for monitoring psychotherapy techniques in ongoing studies of the treatment of patients with severe personality disorders. Psychiatrists at the advanced resident level or immediate postresidency level have been trained to use the TVII to rate videotaped therapy sessions reliably.
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Leventman S, Selzer M. Kike! International Migration Review 1974. [DOI: 10.2307/3002717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dichter M, Herman C, Selzer M. Extracellular unit analysis of the hippocampal penicillin focus. Electroencephalogr Clin Neurophysiol 1973; 34:619-29. [PMID: 4122397 DOI: 10.1016/0013-4694(73)90007-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Dichter MA, Herman CJ, Selzer M. Silent cells during interictal discharges and seizures in hippocampal penicillin foci. Evidence for the role of extracellular K+ in the transition from the interictal state to seizures. Brain Res 1972; 48:173-83. [PMID: 4645204 DOI: 10.1016/0006-8993(72)90177-1] [Citation(s) in RCA: 106] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Lewis AB, Selzer M. Some neglected issues in milieu therapy. Hosp Community Psychiatry 1972; 23:293-8. [PMID: 5070243 DOI: 10.1176/ps.23.10.293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Selzer M, Spencer WA. Interactions between visceral and cutaneous afferents in the spinal cord: reciprocal primary afferent fiber depolarization. Brain Res 1969; 14:349-66. [PMID: 5794912 DOI: 10.1016/0006-8993(69)90115-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Selzer M, Spencer WA. Is referred pain a spinal phenomenon? Neurology 1968; 18:290-1. [PMID: 5690373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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Cimerman C, Selzer M. Macro- and micro-volumetric determination of anthranilic acid and its application in inorganic quantitative macro- and micro-analysis. Anal Chim Acta 1953. [DOI: 10.1016/s0003-2670(01)80729-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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