Article
Polymer Science
Ritika Singh Petersen, Anja Boisen, Stephan Sylvest Keller
Summary: The study introduces a high-throughput technique - Micromechanical Punching (MMP) for fabrication of non-spherical microparticles. It allows production of microparticles from prepatterned, porous, and fibrous films, constituting thermoplastics and thermosetting polymers. This method shows potential to make micro/nanofabrication more accessible to research and industrial communities for engineered particles applications.
Article
Polymer Science
Guus van der Borg, Harry Warner, Melina Ioannidis, Geert van den Bogaart, Wouter H. Roos
Summary: 3D printing with polylactic acid (PLA) filament is shown to be a cheaper and more easily accessible alternative to resin printing for manufacturing PDMS molds. A method using chloroform vapor treatment is introduced to smoothen the printed PLA mold, which was successfully used to cast PDMS rings. The PDMS-glass well created with the PLA mold showed no leakage and was suitable for cell culturing, as tested with monocyte-derived dendritic cells (moDCs).
Article
Chemistry, Multidisciplinary
Subhajit Pal, Dinh Phuong Trinh Nguyen, Angelique Molliet, Mahshid Alizadeh, Aurelien Crochet, Roberto D. Ortuso, Alke Petri-Fink, Andreas F. M. Kilbinger
Summary: The study introduces two chlorophosphonium iodide reagents that can activate aromatic carboxylic acids in the presence of amine initiators, allowing the formation of living polymers. These reagents facilitate living polymerization in the presence of amine initiators, enabling the preparation of diblock copolymers and triblock terpolymers.
Article
Chemistry, Multidisciplinary
Dongming Ding, Li Gong, Miao Li, Xie Cheng, Huahong Peng, Zesheng Zhang, Shuai Wang, Xibo Yan
Summary: Pectin-based biopolymer nanoparticles can be fabricated through aqueous nanoprecipitation with a solvent/water shift. The solubility of pectin can be adjusted by the citric acid content in the solution, allowing the production of biopolymer nanoparticles with tunable sizes. This method enables the direct fabrication of pectin-based biopolymer nanoparticles with good colloidal stability. The particle size and solid content can be regulated by the feed concentration, target pH, and solvent-shifting process, showing great potential for the programmable fabrication of versatile biopolymer nanomaterials.
Article
Chemistry, Multidisciplinary
Minh Nhut Le, Kang-Jun Baeg, Kyung-Tae Kim, Seung-Han Kang, Byung Doo Choi, Chan-Yong Park, Seong-Pil Jeon, Sol Lee, Jeong-Wan Jo, Seonhyoung Kim, Jun-Gu Park, Dongil Ho, Jongin Hong, Miso Kim, Han-Ki Kim, Choongik Kim, Kwanpyo Kim, Yong-Hoon Kim, Sung Kyu Park, Myung-Gil Kim
Summary: Stress-diffusive organic-inorganic hybrid superlattice nanostructures have been developed to overcome the mechanical limitations of metal oxides in flexible electronic applications, providing high electrical conductivity and mechanical stability.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Sebastjan Nemec, Slavko Kralj
Summary: The study presents a dynamic soft-templating strategy for controllably synthesizing hierarchical dual-mesoporous silica shells on diverse core nanoparticles, allowing easy design of applicable silica shells with tunable pore geometries. This method demonstrates versatility by transferring the coating procedure to various core particles, showing potential as a general approach for fabricating well-designed mesoporous silica coatings on a wide variety of core nanoparticles.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Naif Ahmed Alshehri, Abdulaziz K. Assaifan, Ayed A. Albalawi, Eman H. Alghamdi, Y. Niu, C. Pleydell-Pearce, Theodore Pavloudis, Joseph Kioseoglou, Mohammed Alsawat, T. T. G. Maffeis
Summary: This study successfully fabricated a scalable and reproducible ZnO@TiO2 heterostructure using a simple wet chemical method, investigated the impact of reaction parameters on the structure, and discovered the improvement in optical properties through photonic annealing.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Civil
J. Perez-Aracil, D. Casillas-Perez, S. Jimenez-Fernandez, L. Prieto-Godino, S. Salcedo-Sanz
Summary: This paper discusses the performance of a multi-method ensemble for optimization in a turbine layout problem for wind farms. The Coral Reefs Optimization algorithm with Substrate Layer (CRO-SL) is evaluated and found to achieve excellent results in the turbine layout problem.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Chemistry, Multidisciplinary
Qian Wei, Ze-Ping Wang, Xiao Zhang, Yi Zou
Summary: This study reports a novel strategy for enzymatic diaryl ether generation through a nonoxidative manner. A versatile thioesterase domain was discovered to catalyze the formation of diarly ethers and insights into its catalytic process were provided through further mutations and biochemical analyses.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Polymer Science
Li Zhou, Run-Tan Gao, Xin-Jie Zhang, Kai He, Lei Xu, Na Liu, Zong-Quan Wu
Summary: End-functionalization of helical polycarbenes using Sonogashira coupling reaction is developed in this study. This method allows for the introduction of various functional groups at the chain end to construct functional polymer materials, while easily removing transition metal residues at the end of polymer chains.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Xiuli Bi, Yixuan Shang, Bo Liu, Bin Xiao, Weisheng Li, Xinbo Gao
Summary: Contrast enhancement manipulation is a common method to improve the visual effect of an image, but it can also be considered a type of global image forgery. Detecting contrast enhancement manipulations is critical for global image forgery detection as it helps identify tampering attempts. Existing methods can only detect specific types of contrast enhancement manipulations, but our proposed zero-gap spans (ZGS) approach can explore and distinguish various contrast enhancement manipulations through image-level and patch-level classification, as well as estimate gamma values for gamma corrections.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Siyuan Ye, Nobuhiko Hosono, Takashi Uemura
Summary: Two-dimensional (2D) materials based on metal-organic framework (MOF) nanosheets have high structural designability and anisotropy, making them highly useful in various fields. However, their high surface energy often leads to aggregation and low dispersibility, limiting their applications. A new polymer-grafting approach significantly enhances the dispersibility and stability of MOF nanosheets, allowing for improved performance in applications such as photoredox catalysts and oil/water separation membranes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Zhiyuan Yuan, Yisi Li, Minglei Shi, Fan Yang, Juntao Gao, Jianhua Yao, Michael Q. Zhang
Summary: SOTIP is a versatile method that incorporates microenvironments and their interrelationships into a unified graph, allowing for spatial heterogeneity quantification, spatial domain identification, and differential microenvironment analysis across multiple spatial omics datasets. Validation on various datasets shows that SOTIP outperforms existing methods in accuracy and interpretability for spatial omics data analysis.
NATURE COMMUNICATIONS
(2022)
Review
Polymer Science
Seyedeh Nooshin Banitaba, Andrea Ehrmann
Summary: This article discusses the basic principles of electrochemical devices and focuses on the application of electrospun nanofiber materials in electrolytic cells, batteries, fuel cells, etc. Electrospinning technology enables customization of material morphology and properties, providing new insights for the development of electrochemical devices.
Article
Chemistry, Physical
Takuya Ishida, Yohei Yanaga, Sunao Yamada, Yukina Takahashi
Summary: A convenient one-step approach for surface modification of citrate-capped gold nanoparticles with hydrophobic thiol or its dye-derivative was demonstrated. The success of surface immobilization depended on the solubility of the nanoparticles and the modifier in the reaction solvent. The modified nanoparticles exhibited redispersibility even after storing under dried powder conditions, and showed enhanced Raman scattering and spectroscopic effects.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Thilini K. Ekanayaka, Ping Wang, Saeed Yazdani, Jared Paul Phillips, Esha Mishra, Ashley S. Dale, Alpha T. N'Diaye, Christoph Klewe, Padraic Shafer, John Freeland, Robert Streubel, James Paris Wampler, Vivien Zapf, Ruihua Cheng, Michael Shatruk, Peter A. Dowben
Summary: The [Co(SQ)(2)(4-CN-py)(2)] complex shows dynamic effects at various temperatures, with the orbital moment exhibiting a nonzero critical field for net alignment of magnetic moments, in contrast to the spin moment behavior.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Camiel van Efferen, Clifford Murray, Jeison Fischer, Carsten Busse, Hannu-Pekka Komsa, Thomas Michely, Wouter Jolie
Summary: Non-invasive techniques using graphene as a dopant are utilized to shift the chemical potential of monolayer MoS2, inducing large electronic changes. Oxygen intercalation causes a rigid Fermi level shift in MoS2, while europium intercalation induces a metal-insulator transition and reduces the band gap. The 1D states within MoS2 mirror-twin boundaries remain unaffected by substrate charge and can serve as chemical potential sensors.
Article
Chemistry, Physical
Maximilian Kastenmeier, Lukas Fusek, Xin Deng, Tomas Skala, Sascha Mehl, Nataliya Tsud, Sebastian Grau, Corinna Stumm, Vitalii Uvarov, Viktor Johanek, Joerg Libuda, Yaroslava Lykhach, Josef Myslivec, Olaf Brummel
Summary: This study demonstrates the effect of particle size and shape on the oxidation behavior of nanostructured electrocatalysts and reveals the crucial role of electronic metal support interaction (EMSI) in the stability of metal/oxide interfaces.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
James Forsythe, Oleksandr Leiko, Vitalii Uvarov, Jan Skvara, Josef Myslivecek, Karel Masek, Viktor Johanek
Summary: Heteroepitaxial layers of ordered cobalt monoxide were prepared on single crystal Cu(111) substrate using two physical deposition methods. The structure and orientation of the CoO thin films were characterized, and the surface morphology was probed using scanning tunneling microscopy. It was found that only at low oxygen pressures could the cobalt monoxide phase be established on the Cu(111) surface.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Olaf Brummel, Yaroslava Lykhach, Maryline Ralaiarisoa, Matias Berasategui, Maximilian Kastenmeier, Lukas Fusek, Alexander Simanenko, Wenqing Gu, Pip C. J. Clark, Rossella Yivlialin, Michael J. Sear, Josef Myslivecek, Marco Favaro, David E. Starr, Joerg Libuda
Summary: We present a new technique for investigating complex model electrocatalysts using electrochemical in situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS). Our experiment demonstrates the potential of our approach and the importance of electrochemical in situ AP-XPS for studying complex electrocatalytic interfaces.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Thilini K. Ekanayaka, Okten Ungor, Yuchen Hu, Esha Mishra, Jared P. Phillips, Ashley S. Dale, Saeed Yazdani, Ping Wang, Kayleigh A. McElveen, M. Zaid Zaz, Jian Zhang, Alpha T. N'Diaye, Christoph Klewe, Padraic Shafer, Rebecca Y. Lai, Robert Streubel, Ruihua Cheng, Michael Shatruk, Peter A. Dowben
Summary: Modifications driven by TCNQ affect the spin state configuration and electric conductivity of [Fe(3-bpp)2](TCNQ)2 and [Fe{H2B(pz)2}2(bipy)] and TCNQ mixtures. The addition of TCNQ increases the conductivity and carrier lifetimes of [Fe{H2B(pz)2}2(bipy)]. TCNQ also enhances the transistor carrier mobility of [Fe{H2B(pz)2}2(bipy)] thin films grown using DMF.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Esha Mishra, Thilini K. Ekanayaka, Theodoros Panagiotakopoulos, Duy Le, Talat S. Rahman, Ping Wang, Kayleigh A. McElveen, Jared P. Phillips, M. Zaid Zaz, Saeed Yazdani, Alpha T. N'Diaye, Rebecca Y. Lai, Robert Streubel, Ruihua Cheng, Michael Shatruk, Peter A. Dowben
Summary: This study investigates the influence of an interface between a semiconducting polyaniline polymer or a polar poly-D-lysine molecular film and valence tautomeric complexes on the electronic structure. X-ray photoemission, X-ray absorption, inverse photoemission, and optical absorption spectroscopy measurements, guided by density functional theory, were used to identify electronic transitions and orbitals. The choice of substrate had little effect on the electronic structure, except for slight modifications in binding energies and orbital levels. A significant ligand-to-metal charge transfer state was observed in the Co-II high-spin state, which was insensitive to the interface between the polymer and tautomeric complexes.
Article
Chemistry, Physical
Thilini Ekanayaka, Tao Jiang, Emilie Delahaye, Olivier Perez, Jean-Pascal Sutter, Duy Le, Alpha T. N'Diaye, Robert Streubel, Talat S. Rahman, Peter A. Dowben
Summary: A chiral 3D coordination compound, [Gd-2(L)(2)(ox)(2)(H2O)(2)], arranged around a dinuclear Gd unit, has been characterized by X-ray photoemission and X-ray absorption measurements. The Gd 5p core level photoemission spectra indicate the dominance of spin orbit coupling over j-J coupling observed in the Gd metal spectra, suggesting the absence of inversion symmetry due to the ligand field. Density functional theory calculations predict antiferromagnetic alignment of the Gd-2 dimers and a band gap consistent with optical absorption.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Daniela Dombrowski, Abdus Samad, Kai Mehlich, Thais Chagas, Udo Schwingenschlogl, Carsten Busse
Summary: We prepare monolayers of tantalum sulfide on Au(111) through evaporating tantalum in the presence of H2S. Depending on the sulfur concentration, either 2H-TaS2 monolayers or TaS monolayers are formed. Using scanning tunneling microscopy and density functional theory calculations, we investigate the alignment of the layers with the substrate and the formation of heterostructures. We observe mirror twin boundaries within 2H-TaS2 along the S- and Ta-edge.
Article
Chemistry, Physical
Kai Mehlich, Abdus Samad, Catherine Grover, Daniela Dombrowski, Jiaqi Cai, Udo Schwingenschloegl, Carsten Busse, Thais Chagas
Summary: We studied the nucleation stage of epitaxial growth of monolayer TaS2 by using ultrahigh-vacuum conditions and Au(111) as the substrate. The atomic-scale protrusions with a well-defined triangular shape were identified as TaS3 using density functional theory. These protrusions act as nuclei for the growth of extended TaS2 monolayers with a unique orientation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Coatings & Films
Heshan Yu, Tieren Gao, A. T. N'Diaye, E. Arenholz, Suchismita Sarker, Apurva Mehta, Xiaohang Zhang, Ichiro Takeuchi
Summary: We have fabricated high-quality polycrystalline Fe1-xRhx composition-spread thin films and investigated their structural and magnetic transformations. The Fe1-xRhx film undergoes a phase transition from α to γ phase, accompanied by a magnetic transition from ferromagnetic to paramagnetic phase, as the Rh concentration increases. We constructed a thin-film phase diagram of Fe1-xRhx based on the structural and magnetic properties, which showed slightly different transition behaviors compared to bulk alloys.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Physical
Thais Chagas, Kai Mehlich, Abdus Samad, Catherine Grover, Daniela Dombrowski, Jiaqi Cai, Udo Schwingenschlogl, Carsten Busse
Summary: We investigate the nucleation stage of monolayer TaS2 in epitaxial growth of monolayer transition-metal sulfides. By using scanning tunneling microscopy, we discover atomic-scale protrusions with a triangular shape that serve as nuclei for the further growth of extended TaS2 monolayers. These protrusions are identified as TaS3 using density functional theory. The unique orientation of these protrusions is proposed to cause the well-defined orientation of complete TaS2 layers under optimal growth conditions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Jia Xu, Mengwen Jia, Chao Zhou, Qian Li, Padraic Shafer, Gong Chen, Mengmeng Yang, Alpha T. N'Diaye, Elke Arenholz, Ziqiang Qiu, Yizheng Wu
Summary: The spin Hall magnetoresistance (SMR) effect in single-crystalline Pt/CoO(001) bilayers has been systematically investigated. X-ray magnetic linear dichroism measurements prove that CoO antiferromagnetic (AFM) spins can be switched into the direction orthogonal to the applied field. We find that the SMR signal is composed of two components related to either the switching of CoO AFM Neel order or the applied strong field effect. Both SMR components show a positive angular dependence. The observed positive SMR is mainly attributed to the uncompensated spins at the Pt/CoO interface.
Article
Materials Science, Multidisciplinary
Philipp Valerius, Carsten Speckmann, Boris Senkovskiy, Alexander Gruneis, Nicolae Atodiresei, Thomas Michely
Summary: Patterns formed in monolayer graphene and hexagonal boron nitride under ion irradiation were investigated using scanning tunneling microscopy. Subnanometer pores with periodic distribution were created, and excess vacancies were expelled from the array. Successful delamination of a perforated graphene monolayer was achieved, providing a new material for membrane research.
Article
Chemistry, Multidisciplinary
Alexander Herman, Stefan Kraus, Shigeru Tsukamoto, Lea Spieker, Vasile Caciuc, Tobias Lojewski, Damian Guenzing, Jan Dreiser, Bernard Delley, Katharina Ollefs, Thomas Michely, Nicolae Atodiresei, Heiko Wende
Summary: From macroscopic heavy-duty permanent magnets to nanodevices, precise control of magnetic properties in rare-earth metals is crucial for various daily life applications. In this study, a proof-of-concept approach using a dysprosium-iridium surface alloy and graphene adsorption is presented, enabling the tailored manipulation of magnetic properties. By selectively lifting magnetic 4f-metal atoms from the surface alloy through the adsorption of graphene, a giant magnetic anisotropy in dysprosium atoms is introduced. The successful introduction and demonstration of this concept provide a clear understanding of its underlying mechanism and pave the way for an alternative approach to modify the crystal field around 4f-atoms and their magnetic anisotropies.
