Article
Materials Science, Multidisciplinary
Fulin Liu, Yao Chen, Lang Li, Chong Wang, Qingyuan Wang, Yongjie Liu
Summary: The interior defect-induced crack initiation mechanism and early growth behavior of Ti6Al4V alloy fabricated by laser powder bed fusion (LPBF) have been investigated in the very high cycle fatigue (VHCF) regime. The findings show that the formation of fine granular area (FGA) is composed of discontinuous nanograins, which are associated with dislocation movement and grain boundaries. Additionally, the fatigue loading process and the LPBF process contribute to the development of microvoids, accelerating the extension of microcracks.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Hongguang Deng, Min Zhong, Wenhu Xu
Summary: The effects of three different types of surfactants, including CTAB, SDBS, and AEO, on sapphire UV-CMP were investigated. AEO and SDBS caused abrasive agglomeration and slight particle size increase due to hydrogen bonding and electrostatic repulsion respectively. CTAB exhibited significant agglomeration of abrasive particles due to electrostatic attraction. The addition of 0.10% CTAB resulted in the best polishing effects with a sapphire MRR of 80.50 nm/min and a surface roughness of 0.200 nm.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Acoustics
Ben Nanzai, Akimitsu Mochizuki, Yusuke Wakikawa, Yusuke Masuda, Tadashi Oshio, Kazuhiro Yagishita
Summary: In this study, the average temperature of cavitation bubbles in different types of organic solvents was estimated using the methyl radical recombination method. The effects of solvents' physical properties on cavitation temperature were also discussed. The results showed that organic solvents with lower vapor pressure exhibited higher cavitation bubble temperature and sonoluminescence intensity, particularly in aromatic alcohols, due to the highly resonance-stable generated radicals. These findings are useful for accelerating sonochemical reactions in organic solvents, which are essential for organic synthesis and material synthesis.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Engineering, Industrial
Tianqi Zhang, Zixuan Wang, Tianbiao Yu, Hao Chen, Jinlong Dong, Ji Zhao, Wanshan Wang
Summary: With the advancement of science and technology, the demand for advanced machining techniques for hard and brittle materials has led to research on ultrasonic vibration-assisted polishing (UVAP) which can improve surface quality and efficiency. Predicting surface profiles and controlling polishing parameters are crucial for reducing errors in UVAP to enable deterministic material removal.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Tianqi Zhang, Chuang Guan, Chao Zhang, Wenchao Xi, Tianbiao Yu, Ji Zhao
Summary: The study introduced the UVAP method in polishing BK7 optical glass to improve efficiency and quality. A mathematical model considering ultrasonic vibration effects and a new concept of Preston-coefficient distribution function were proposed. Experiments validated the effectiveness of UVAP in achieving higher material removal rate and better surface quality. The research results can be applied for adjusting polishing parameters and trajectory planning for global polishing of workpiece surfaces.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Pedro R. da Costa, Manuel Sardinha, Luis Reis, Manuel Freitas, Manuel Fonte
Summary: Additive Manufacturing (AM) allows for almost infinite geometric freedom in mechanical design, enabling complex geometries with lower weight and improved behavior. The mechanical properties of AM materials are continuously researched due to various influencing factors, with surface quality having a significant impact on final mechanical properties and fatigue strength. Different post-treatment methods have shown positive effects on improving fatigue strength.
FORCES IN MECHANICS
(2021)
Article
Physics, Applied
R. Hink, A. Pipa, J. Schaefer, R. Caspari, R. Weichwald, R. Foest, R. Brandenburg
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Instruments & Instrumentation
Th Wegner, B. Geiger, R. Foest, A. Jansen van Vuuren, V. R. Winters, C. Biedermann, R. Burhenn, B. Buttenschoen, G. Cseh, I Joda, G. Kocsis, F. Kunkel, A. Quade, J. Schaefer, O. Schmitz, T. Szepesi
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Food Science & Technology
Uta Schnabel, Oliver Handorf, Joerg Stachowiak, Daniela Boehm, Christoph Weit, Thomas Weihe, Jan Schaefer, Harald Below, Paula Bourke, Joerg Ehlbeck
Summary: The use of plasma-treated water (PTW) in fresh-cut lettuce processing can effectively reduce microbial load, ensuring food safety and quality. PTW has a significant impact on microbial and metabolic activities of lettuce, but it does not adversely affect food quality.
FOOD ENGINEERING REVIEWS
(2021)
Article
Chemistry, Physical
Gustav W. Sievers, Anders W. Jensen, Jonathan Quinson, Alessandro Zana, Francesco Bizzotto, Mehtap Oezaslan, Alexandra Dworzak, Jacob J. K. Kirkensgaard, Thomas E. L. Smitshuysen, Shima Kadkhodazadeh, Mikkel Juelsholt, Kirsten M. o. Jensen, Kirsten Anklam, Hao Wan, Jan Schaefer, Klara Cepe, Maria Escudero-Escribano, Jan Rossmeisl, Antje Quade, Volker Brueser, Matthias Arenz
Summary: A new concept of self-supported platinum-cobalt oxide networks has been proposed, combining high specific activity with a high ECSA, promising a stable fuel-cell operation. This concept exceeds the US Department of Energy targets for Pt-related ORR mass activity.
Article
Physics, Applied
Tom Trautvetter, Jan Schaefer, Omar Benzine, Ralf Methling, Hardy Baierl, Volker Reichel, Jan Dellith, Daniel Koepp, Frank Hempel, Marjan Stankov, Margarita Baeva, Ruediger Foest, Lothar Wondraczek, Katrin Wondraczek, Hartmut Bartelt
PLASMA PROCESSES AND POLYMERS
(2020)
Article
Materials Science, Coatings & Films
Sehoon An, Rudiger Foest, Katja Fricke, Hendrik Riemer, Maik Froehlich, Antje Quade, Jan Schaefer, Klaus-Dieter Weltmann, Holger Kersten
Summary: The article explores the versatility of plasma electrolytic polishing (PEP) for cleaning and coating the surface of cemented carbide cutting tools. Results show that PEP treatment improves cleaning effectiveness and coating adhesion, leading to a significant increase in tool life.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Nicholas Farr, Jeerawan Thanarak, Jan Schaefer, Antje Quade, Frederik Claeyssens, Nicola Green, Cornelia Rodenburg
Summary: Understanding the effects of sterilization methods on biomaterial surface is crucial for clinical deployment. This study compared surfaces from autoclave sterilization with low-pressure Argon glow discharge to explore a potential new sterilization method, finding that the latter showed promising results for further optimization as a potential terminal sterilization method.
Article
Multidisciplinary Sciences
Steffen Franke, Lucian Paulet, Jan Schaefer, Deborah O'Connell, Markus M. Becker
Article
Nutrition & Dietetics
Uta Schnabel, Oliver Handorf, Hauke Winter, Thomas Weihe, Christoph Weit, Jan Schaefer, Joerg Stachowiak, Daniela Boehm, Harald Below, Paula Bourke, Jorg Ehlbeck
Summary: This study evaluated the impact of plasma treated water (PTW) on fresh-cut endive processing, finding that PTW can maintain the quality characteristics of endive and improve color and texture, while also reducing microbial load within EU regulations.
FRONTIERS IN NUTRITION
(2021)
Article
Polymer Science
Mehdi Ravandeh, Masoud Mehrjoo, Konstantin Kharitonov, Jan Schaefer, Antje Quade, Bruno Honnorat, Mabel Ruiz-Lopez, Barbara Keitel, Svea Kreis, Rui Pan, Seung-gi Gang, Kristian Wende, Elke Ploenjes
Summary: Polyethylene terephthalate (PET) is a widely used thermoplastic polyester in industry. Surface modification is required for printing and coating processes, and plasma treatment is commonly used to increase the hydrophilicity of PET films. This study used X-ray ptychography and scanning electron microscopy to investigate the effects of plasma treatment on the surface morphology of PET films. The results showed increased roughness and changes in morphology, as well as an increase in oxygen content and polarity without significant damage to the polymer.
Article
Physics, Applied
Maren Dworschak, Niklas Kohlmann, Filip Matejka, Pavel Galar, Lorenz Kienle, Jan Schaefer, Jan Benedikt
Summary: The HelixJet plasma source was utilized to synthesize silicon nanoparticles (Si-NPs) operating under atmospheric pressure. By adjusting the operational parameters, Si-NPs with different sizes, crystallinity, structure, and photoluminescence properties were achieved. The addition of H-2 and high RF powers led to the formation of crystalline nanoparticles with strong photoluminescence intensity, which could be tuned by controlling the synthesis parameters. Post-synthesis annealing allowed for the synthesis of large crystalline nanoparticles. The study also involved design improvements for the HelixJet plasma source, enhancing its stability and enabling continuous long-term operation.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Engineering, Environmental
Rezvan Hosseini Rad, Volker Brueser, Milko Schiorlin, Jan Schaefer, Ronny Brandenburg
Summary: CO2 splitting in a dielectric barrier discharge (DBD) is investigated using both empty and packed bed reactors with and without cerium oxide catalyst. The DBDs are operated at pressures up to 2 bar, with the addition of argon to reduce breakdown voltage. The electrical characteristics of the discharge are studied, along with the CO2 dissociation. Increasing pressure requires a higher minimum sustaining voltage amplitude, but the optimum power input depends on pressure and gas composition. Adding ceria-coated glass spheres improves reactor performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Nicholas T. H. Farr, Sabiniano Roman, Jan Schaefer, Antje Quade, Daniel Lester, Vanessa Hearnden, Sheila MacNeil, Cornelia Rodenburg
Summary: Polypropylene (PP) surgical mesh, successful in abdominal hernia repair, can lead to serious clinical complications when used for stress urinary incontinence or pelvic organ prolapse repair in the pelvic floor; evidence suggests that PP fibers are susceptible to oxidative damage and play a role in causing complications. The specific host response mechanisms against the material remain poorly understood.