Article
Astronomy & Astrophysics
Pablo Bueno, Pablo A. Cano, Javier Moreno, Guido van der Velde
Summary: A plethora of new analytic black holes and globally regular horizonless spacetimes in three dimensions have been discovered, with solutions involving a single real scalar field. The new metrics are continuous generalizations of the BTZ solution, solving the Einstein gravity equations corrected by a new family of densities. Some solutions describe black holes with one or several horizons, while others have curvature singularities or are completely regular. Additionally, there are solutions describing globally regular and horizonless geometries.
Article
Chemistry, Physical
Forough Ghasem Zadeh Moslabeh, Farzaneh Fouladgar, Amir Jafari, Neda Habibi
Summary: This study demonstrates the possibility of substrate-free peptide self-assembly through acoustic levitation and investigates the effects of peptide concentration and acoustic wave velocity amplitude on the resultant nano-structures.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Multidisciplinary
Kevin Grill, Sabrina B. Dinauer, Eugenia Peresypkina, Alexander V. Virovets, Manfred Scheer
Summary: Pentaphosphaferrocenes are used as building blocks for polymeric assemblies in supramolecular chemistry when combined with coinage metal salts. A one-pot reaction between [Cp(R)Fe(eta(5)-P-5)] and AgSbF6, with the addition of rigid aromatic dinitriles, leads to the formation of various coordination polymers. The structure of the cyclopentadiene ligands and the rigidity of the dinitriles play a key role in the formation of these polymers, which were characterized by various techniques.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Alessandro Marchetti, Alessandro Gori, Anna Maria Ferretti, Daniel Arenas Esteban, Sara Bals, Claudia Pigliacelli, Pierangelo Metrangolo
Summary: Finite 3D structures with controlled morphology can be achieved in the out-of-equilibrium self-assembly of Au NPs using a spherical peptide-gold superstructure (PAuSS) as a template, resulting in a transient 3D-branched Au-nanoshell (BAuNS) stabilized by sodium dodecyl sulphate (SDS). The BAuNS dismantles and regresses to PAuSS through equilibrium of SDS concentration gradient over time in the sample solution, causing NP disassembly. The assembly and disassembly of BAuNS promote temporary interparticle plasmonic coupling, enabling reversible and tunable changes in their plasmonic properties, which is highly desirable for the development of optoelectronic nanodevices.
Article
Automation & Control Systems
Daniel Wertjanz, Ernst Csencsics, Georg Schitter
Summary: This article introduces a three-degree-of-freedom magnetically levitated vibration compensating measurement platform that can be used for robot-based surface inspection of free-forms. The platform can maintain a stable position through feedback control and actively compensate for environmental vibrations in tracking mode. Experimental results show that the platform can accurately measure the position of the sample surface while reducing disturbing vibrations.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Polymer Science
Dong Hwan Kim, Hong Gu Kwon, Hong Kyoon Choi
Summary: In this study, dewetting-induced hierarchical patterns were successfully formed using two self-assembled materials: block copolymers and colloidal crystals. The periodic structures of colloidal crystals were used as templates to generate multi-scale hierarchical patterns with block copolymers. Various concentric ring patterns were observed and explained using a free energy model. Spiral-defective features were also examined and found to be promoted by Y-junction defects.
Article
Chemistry, Multidisciplinary
Selina Hollstein, Oleksandr Shyshov, Marko Hanzevacki, Jie Zhao, Tamara Rudolf, Christof M. Jaeger, Max von Delius
Summary: This study reports on the dynamic covalent self-assembly of anion cryptates that offer an inherent mechanism for the release of guest ions. These self-assembled architectures exhibit moderate affinity for anions such as chloride, bromide or iodide, making them suitable for membrane transport applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Physics, Multidisciplinary
Mateusz Mazelanik, Adam Leszczynski, Tomasz Szawello, Michal Parniak
Summary: The authors propose and demonstrate an optical method to probe spin resonances and reconstruct the 3D structure of an atomic ensemble's coherence based on a single measurement of a two-photon Raman transition. This technique allows for the reconstruction of complex 3D coherence profiles and has the potential to be used in magnetometry, electrometry, and imaging of electromagnetic fields.
COMMUNICATIONS PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Muneo Futamura, Shunsuke Homma
Summary: The study involved a levitation system using a bulk superconductor supplemented with a hybrid stator containing a ring-shaped magnet, aimed at improving stability. The effect of the inner diameter of the ring-shaped magnet on levitation stability was investigated, showing improved vertical magnetic stiffness at 25-mm diameter and expanded range for horizontal stiffness.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Astronomy & Astrophysics
Yue Hu, A. Lazarian, Q. Daniel Wang
Summary: The Velocity Gradient Technique (VGT) provides an attractive solution for measuring and mapping magnetic fields in the interstellar medium. By applying the VGT to CO data cubes, researchers were able to decompose the magnetic field maps and investigate their significance. The results showed that the VGT has the potential to decompose velocity or density-dependent magnetic structures.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Materials Science, Paper & Wood
Huan Liu, Bo Pang, Kai Zhang
Summary: This study demonstrates the self-assembly of cellulose nanowhiskers (CNWs) in confined geometries to fabricate ordered honeycomb microporous films. The critical influencing factors for film formation include the concentration of CNW-SU suspensions, relative humidity, and surface-attached moieties. Immobilized hydrophobic groups on CNWs significantly affect the formation of uniform porous films.
Article
Chemistry, Physical
Mahesh Prasad, Bibhas Hazra, Avijit Sardar, Raki Mandal, Soumajit Gayen, Pradip K. Tarafdar
Summary: Nature extensively uses templated assembly of small molecules in nano-structural architectures. This study investigates the interactions among molecules at the molecular level and the role of phosphate templated assembly in the formation of prebiotic protocellular membranes.
Article
Polymer Science
Zaizai Tong, Yawei Su, Yikun Jiang, Yujie Xie, Shichang Chen, Rachel K. O'Reilly
Summary: The design of hybrid hierarchical architectures remains challenging, but the use of crystallization-driven selfassembly methods can help in constructing brushlike structures with controlled shape and size on carbon nanotubes. By anchoring seeds through hydrogen bonding and using in situ CDSA process with added monomers, brushlike heterostructures containing both CNTs and CDSA nanoassemblies were fabricated. The shape of the crystals changed from platelets to long and thin crystals with increasing mass ratios of seed micelles to CNTs.
Article
Astronomy & Astrophysics
Yue Hu, A. Lazarian
Summary: This study aims to map the Galactic magnetic field (GMF) in 3D by utilizing the MM2 technique, the velocity gradient technique (VGT), the column density variance approach, and the Galactic Arecibo L-band Feed Array HI survey. The results reveal the sub-Alfvenic and subsonic nature of the H i gas, with mean M-A ranging from 0.6 to 0.9 and mean M-s ranging from 0.2 to 1.5. The mean magnetic field strength varies from 0.5 to 2.5 μG, showing a decreasing trend towards the Galaxy's outskirt. This work provides a new avenue for mapping the GMF in 3D.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Bruno C. Batista, Amari Z. Morris, Oliver Steinbock
Summary: Chemical gardens are complex structures formed by precipitation reactions, and their patterns depend on spatial confinement and reactant injection. A cellular automaton model was developed to simulate the self-organization of chemical gardens, which reproduced the formation of thin-walled filaments and various shapes in two and three dimensions. This model highlights the significance of temporal changes in the self-healing membrane material.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.