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Your search keyword '"Hüsgen, Bruno"' showing total 17 results
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17 results on '"Hüsgen, Bruno"'

1. Pyrolysis of sucrose-derived hydrochar

Author

Wortmann, Martin, Keil, Waldemar, Brockhagen, Bennet, Biedinger, Jan, Westphal, Michael, Weinberger, Christian, Diestelhorst, Elise, Hachmann, Wiebke, Zhao, Yanjing, Tiemann, Michael, Reiss, Günter, Hüsgen, Bruno, Schmidt, Claudia, Sattler, Klaus, and Frese, Natalie

Published
2022
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4. Identification of Microorganisms from Several Surfaces by MALDI-TOF MS: P. aeruginosa Is Leading in Biofilm Formation

Author

Asghari, Ehsan, Kiel, Annika, Kaltschmidt, Bernhard Peter, Wortmann, Martin, Schmidt, Nadine, Hüsgen, Bruno, Hütten, Andreas, Knabbe, Cornelius, Kaltschmidt, Christian, and Kaltschmidt, Barbara

Subjects
Pseudomonas aeruginosa, QH301-705.5, domestic appliances, Biology (General), biochemical phenomena, metabolism, and nutrition, MALDI-TOF-MS, biofilm, scanning electron microscopy
Abstract

New ecological trends and changes in consumer behavior are known to favor biofilm formation in household appliances, increasing the need for new antimicrobial materials and surfaces. Their development requires laboratory-cultivated biofilms, or biofilm model systems (BMS), which allow for accelerated growth and offer better understanding of the underlying formation mechanisms. Here, we identified bacterial strains in wildtype biofilms from a variety of materials from domestic appliances using matrix-assisted laser desorption/ionization-time of flight mass spectroscopy (MALDI-TOF-MS). Staphylococci and pseudomonads were identified by MALDI-TOF-MS as the main genera in the habitats and were analyzed for biofilm formation using various in vitro methods. Standard quantitative biofilm assays were combined with scanning electron microscopy (SEM) to characterize biofilm formation. While Pseudomonas putida, a published lead germ, was not identified in any of the collected samples, Pseudomonas aeruginosa was found to be the most dominant biofilm producer. Water-born Pseudomonads were dominantly found in compartments with water contact only, such as in detergent compartment and detergent enemata. Furthermore, materials in contact with the washing load are predominantly colonized with bacteria from the human.

Published
2021

9. Chemical and Morphological Transition of Poly(acrylonitrile)/Poly(vinylidene Fluoride) Blend Nanofibers during Oxidative Stabilization and Incipient Carbonization

Author

Wortmann, Martin, primary, Frese, Natalie, additional, Mamun, Al, additional, Trabelsi, Marah, additional, Keil, Waldemar, additional, Büker, Björn, additional, Javed, Ali, additional, Tiemann, Michael, additional, Moritzer, Elmar, additional, Ehrmann, Andrea, additional, Hütten, Andreas, additional, Schmidt, Claudia, additional, Gölzhäuser, Armin, additional, Hüsgen, Bruno, additional, and Sabantina, Lilia, additional

Published
2020
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13. Examination of Interpenetrating Polymer Networks of Polyurea in Silicone Molds Arising during Vacuum Casting Processes.

Author

Wortmann, Martin, Frese, Natalie, Heide, Alexander, Brikmann, Johannes, Strube, Oliver, Dalpke, Raphael, Gölzhäuser, Armin, Moritzer, Elmar, and Hüsgen, Bruno

Subjects
SILICONES, X-ray photoelectron spectroscopy, POLYMER networks, THERMOGRAVIMETRY, VACUUM casting (Plastics)
Abstract

We present an in-depth investigation of the aging effects in silicone molds for vacuum casting processes. Their lifetime is limited to a few production cycles due to contamination with the diisocyanate component of polyurethane casting materials. Using thermogravimetric analysis measurements, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and helium-ion-microscopy the chemical and physical mechanisms of the aging process have been identified. It has been shown that a diffusion process of diisocyanate into the cavity surface leads to the formation of interpenetrating polymer networks of polyurea derivatives in silicone rubber. This has been proven by extracting and analyzing polyurea of low molecular weights from the silicone. [ABSTRACT FROM AUTHOR]

Published
2018
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16. Examination of the Aging Effects of Silicone Molds During Vacuum Casting Processes via Scanning Electron Microscopy.

Author

Strube, Oliver I., Briesenick, Daniel, Brikmann, Johannes, and Hüsgen, Bruno

Subjects
SILICONES, CHEMICAL molding, VACUUM casting (Plastics), SCANNING electron microscopy, POLYURETHANES, FOCUSED ion beams
Abstract

We present an in-depth investigation of contaminated silicone molds by use of scanning electron microscopy, that provides additional insight into the aging process of the molds. The molds lifetime in vacuum casting processes of polyurethane is limited due to contamination with the diisocyanate compound of the PUR resin. SEM investigations, combined with FIB cross-sections and EDX measurements show that three different types of particles are distributed in the contaminated silicone matrix. The particles differ in shape and size, with a range from 50 nm to 50 µm. This explains the loss in transparency and the hardened haptics of contaminated molds. [ABSTRACT FROM AUTHOR]

Published
2015
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