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1,087 results on '"Ulbricht, Mathias"'

206. Soft synthetic microgels as mimics of mycoplasma

Author

Büning, Dominic, primary, Schumacher, Jens, additional, Helling, Alexander, additional, Chakroun, Ramzi, additional, Ennen-Roth, Franka, additional, Gröschel, Andre H., additional, Thom, Volkmar, additional, and Ulbricht, Mathias, additional

Published
2021
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218. Modification of Polysulfone Ultrafiltration Membranes via Addition of Anionic Polyelectrolyte Based on Acrylamide and Sodium Acrylate to the Coagulation Bath to Improve Antifouling Performance in Water Treatment

Author

Plisko, Tatiana V., primary, Bildyukevich, Alexandr V., additional, Burts, Katsiaryna S., additional, Hliavitskaya, Tatiana A., additional, Penkova, Anastasia V., additional, Ermakov, Sergey S., additional, and Ulbricht, Mathias, additional

Published
2020
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223. One-Step Preparation of Antifouling Polysulfone Ultrafiltration Membranes via Modification by a Cationic Polyelectrolyte Based on Polyacrylamide

Author

Plisko, Tatiana V., primary, Bildyukevich, Alexandr V., additional, Burts, Katsiaryna S., additional, Ermakov, Sergey S., additional, Penkova, Anastasia V., additional, Kuzminova, Anna I., additional, Dmitrenko, Maria E., additional, Hliavitskaya, Tatiana A., additional, and Ulbricht, Mathias, additional

Published
2020
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240. Adhesion, proliferation, and osteogenic differentiation of human mesenchymal stem cells on additively manufactured Ti6Al4V alloy scaffolds modified with calcium phosphate nanoparticles

Author

Chudinova, Ekaterina A., Surmeneva, Maria A., Timin, Alexander S., Karpov, Timofey E., Wittmar, Alexandra, Ulbricht, Mathias, Ivanova, Anna, Loza, Kateryna, Prymak, Oleg, Koptioug, Andrei, Epple, Matthias, Surmenev, Roman A., Chudinova, Ekaterina A., Surmeneva, Maria A., Timin, Alexander S., Karpov, Timofey E., Wittmar, Alexandra, Ulbricht, Mathias, Ivanova, Anna, Loza, Kateryna, Prymak, Oleg, Koptioug, Andrei, Epple, Matthias, and Surmenev, Roman A.

Abstract

In the present study, biocomposites based on 3D porous additively manufactured Ti6Al4V (Ti64) scaffolds modified with biocompatible calcium phosphate nanoparticles (CaPNPs) were investigated. Ti64 scaffolds were manufactured via electron beam melting technology using an Arcam machine. Electrophoretic deposition was used to modify the scaffolds with CaPNPs, which were synthesized by precipitation in the presence of polyethyleneimine (PEI). Dynamic light scattering revealed that the CaP/PEI nanoparticles had an average size of 46 ± 18 nm and a zeta potential of +22 ± 9 mV. Scanning electron microscopy (SEM) revealed that the obtained spherical CaPNPs had an average diameter of approximately 90 nm. The titanium-based scaffolds coated with CaPNPs exhibited improved hydrophilic surface properties, with a water contact angle below 5°. Cultivation of human mesenchymal stem cells (hMSCs) on the CaPNPs-coated Ti64 scaffolds indicated that the improved hydrophilicity was beneficial for the attachment and growth of cells in vitro. The Ti6Al4V/CaPNPs scaffold supported an increase in the alkaline phosphatase (ALP) activity of cells. In addition to the favourable cell proliferation and differentiation, Ti6Al4V/CaPNPs scaffolds displayed increased mineralization compared to non-coated Ti6Al4V scaffolds. Thus, the developed composite 3D scaffolds of Ti6Al4V functionalized with CaPNPs are promising materials for different applications related to bone repair.

Published
2019
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241. Preparation and characterization of hydrophilic and antibacterial silver decorated silica‐grafted‐poly(vinylpyrrolidone) (Ag‐SiO2‐PVP) nanoparticles for polymeric nanocomposites.

Author

Ahsani, Mina, Sabouri, Reza, Ulbricht, Mathias, Hazrati, Hossein, Jafarizad, Abbas, and Yegani, Reza

Subjects
POLYMERIC nanocomposites, SILICA nanoparticles, ENERGY dispersive X-ray spectroscopy, FOURIER transform infrared spectroscopy, VINYL polymers, NANOPARTICLES
Abstract

Hydrophilic antibacterial silver decorated silica‐grafted‐poly(vinylpyrrolidone) (Ag‐SiO2‐PVP) nanoparticles were successfully synthesized in multiple steps. In this regard, silanization of the silica nanoparticles was performed with different concentrations of vinyltrimethoxysilane (VTS) to generate vinyl groups onto the nanoparticles surface. Obtained results showed that by increasing the VTS concentration the amount of vinyl groups on the surface of the silica nanoparticles increased while nanoparticles agglomeration did not occur. Then, poly(vinylpyrrolidone) PVP brushes were grafted onto the silanized silica nanoparticles (SiO2‐VTS) via grafting‐through polymerization method to obtain PVP‐grafted silica nanoparticles (SiO2‐PVP). Fourier transform infrared spectroscopy, thermal gravimetric analysis, and dynamic light scattering confirmed the successful generation of the vinyl groups and PVP brushes onto the silica nanoparticles. Finally, Ag‐SiO2‐PVP nanoparticles were prepared by synthesizing silver nanoparticles onto the SiO2‐PVP nanoparticles to render them antibacterial. Energy dispersive X‐ray spectroscopy showed that highest grafting of silver nanoparticles onto the SiO2‐PVP nanoparticles was obtained for the nanoparticles with highest content of vinyl groups. X‐ray photoelectron spectroscopy was used to identify the elements and their chemical structure for the synthesized nanoparticles. Plate colony counting method was applied to assess the antibacterial effects of the Ag‐SiO2‐PVP nanoparticles which revealed outstanding bactericidal properties of them. [ABSTRACT FROM AUTHOR]

Published
2021
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244. A comparative study on the photocatalytic degradation of organic dyes using hybridized 1T/2H, 1T/3R and 2H MoS₂ nano-sheets

Author

Saber, Mohamed R., Khabiri, Gomaa, Maarouf, Ahmed A., Ulbricht, Mathias, and Khalil, Ahmed S. G.

Subjects
Chemie
Abstract

MoS₂ is a very attractive material and has been well studied for potential applications in various areas. However, due to the wide variety of factors affecting the molecular and electronic structure of MoS₂, several contradictory reports about the adsorptive and photocatalytic properties of such materials have been published. In most of these reports, the effect of the actual phase of the materials on the properties was neglected. Here, different phases of MoS₂ nanosheets (1T/2H, 1T/3R and 2H) have been obtained using the hydrothermal method with different Mo : S molar ratios and different autoclave filling ratios. The obtained materials have been thoroughly characterized using Raman, UV-vis, powder XRD, SEM, TEM and XPS measurements in order to accurately identify the existing phases in each material. A comparative study of the photocatalytic organic dye degradation efficiency under white light irradiation has been conducted using methyl orange to correlate the different activity of each material to the respective phase composition. The results indicate a much higher performance of the 1T/2H phase compared to the 2H and 3R phases. Detailed computational studies of the different phases revealed the emergence of mid-gap states upon introducing 1T sites into the 2H lattice. This leads to the improvement of the photocatalytic activity of 1T/2H compared to the other prepared materials. CA extern

Published
2018

245. Erfolgreiche Trennungen : Innovationen zu Membranverfahren für die Wasseraufbereitung

Author

Panglisch, Stefan and Ulbricht, Mathias

Subjects
Maschinenbau, ddc:570, ddc:660, Chemie, Fakultät für Chemie » Technische Chemie
Abstract

Membranverfahren sind ein anerkannt wesentliches Element in einer nachhaltigen Wasserwirtschaft. Seit der Inbetriebnahme der ersten größeren Anlagen zur Wasseraufbereitung mit druckgetriebenen Membranen in den 1960er Jahren entwickelt sich die Membrantechnologie stetig weiter, immer mit den Zielen, Kosten für Investition und Betrieb zu senken und weitere Anwendungsgebiete zu erschließen., Because of their versatility and intrinsic advantages compared to conventional procedures, membrane processes are an acknowledged essential element in a sustainable water management system with growing national and international significance. Since the first major plants for water treatment with pressure-driven membranes were commissioned in the 1960s, membrane technology has been evolving steadily, always with the aim of reducing costs for investment and operation and of developing further areas of application. Depending on the membrane type, the use of membranes is possible for water and wastewater treatment and also for water reuse. Key targets are the elimination of particles, microorganisms and micro pollutants as well as desalination. Mathias Ulbricht and Stefan Panglisch are jointly researching and developing improved and new membrane materials and processes across faculties., UNIKATE: Berichte aus Forschung und Lehre, no. 51Herausforderung Wasserforschung - lokal, regional, global, p. 58

Published
2018

249. Material‐Auswahlbox zur Herstellung fortgeschrittener Polymermembranen für die Wasseraufbereitung

Author

Panglisch, Stefan, primary, Kouchaki Shalmani, Arman, additional, Weber, Martin, additional, Gronwald, Oliver, additional, Berg, Peter, additional, Heijnen, Martin, additional, Krug, Michaela, additional, Koti, Marcel, additional, Nahrstedt, Andreas, additional, Abetz, Volker, additional, Handge, Ulrich A., additional, Grünig, Lara, additional, Ulbricht, Mathias, additional, and Stratmann, Inga, additional

Published
2019
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