jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Sugeng Hadi Susilo | Azam Muzakhim Imanudin | Taufiq Rochman | Supriatna Adhisuwignjo
Source: EUREKA Physics and Engineering (article, 2024-01-31)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Investigation of electrical conductivity and electromagnetic wave absorption capabilities of water hyacinth biocarbon impregnated with Cu atom This paper discusses the impregnation of Cu atoms at carbonization temperature of water hyacinth bio carbon composite. This composite is used as an absorber of electromagnetic waves. Because the inference of electromagnetic waves can cause damage to other electronic equipment. In addition, electromagnetic wave radiation can cause various human health problems. The purpose of the research is to obtain a material that is able to absorb electromagnetic waves and increase electrical conductivity, impregnation of Cu atoms at carbonization temperature of water hyacinth bio carbon composite. The composite material uses a composition ratio of water hyacinth powder and phenol-formaldehyde of 30:70. The carburization temperatures used were 600 °C, 800 °C, and 1000 °C with a heat increase rate of 7 °C/minute. This study used Scanning Electron Micrograph (SEM), X-Ray Diffraction (XRD), LCR Meter, and vector network analyzer. The results show that the impregnation of Cu atoms at carbonization temperature can increase the area of the nanostructure, thereby increasing the formation of micropores in the composite. The higher the carbonization temperature, the percentage of Cu and carbon compounds can increase, while the percentage of crystal structure decreases. Impregnation of Cu atoms further strengthens the composite's absorption of electromagnetic wave radiation. Impregnation of Cu atoms in water hyacinth bio carbon composites at carbonization temperature can increase the electrical conductivity of the composite. The results of this research have potential applications in the electronics industry, batteries, and electrical devices, and can be used to protect devices from electromagnetic interference, especially in telecommunications and the medical field Hyacinth ; Absorption (acoustics) ; Atom (system on chip) ; Electrical resistivity and conductivity ; Electromagnetic radiation ; Conductivity ; Materials science ; Composite material ; Physics ; Chemistry ; Optics ; Engineering Electromagnetic wave absorption materials ; Flame retardant materials and properties ; Advanced Antenna and Metasurface Technologies
Authors: Kathleen R. Mullin | Dane Johnson | Danna E. Freedman | James M. Rondinelli
Source: Dalton Transactions (article, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Systems-chart approach to the design of spin relaxation times in molecular qubits Molecular qubits are a promising platform for future quantum information science technologies; however, to find success in novel devices requires that the molecules exhibit long spin relaxation times. Understanding and optimizing these relaxation times has been shown to be challenging and much experimental work has been done to understand how various chemical features of the molecular qubit influence relaxation times. Here we have curated a data set of relaxation times of metal complex molecular qubits and formulated systems design charts to provide a hierarchical organization of how chemical variables affect relaxation times <i>via</i> known physical processes. We demonstrate the utility of the systems charts by combining examples from the literature with calculated descriptors for molecules in the dataset. This approach helps reduce the complexity associated with <i>de novo</i> molecular design by providing a map of interdependencies and identifying features to prioritize during synthesis. Qubit ; Relaxation (psychology) ; Spin (aerodynamics) ; Chart ; Quantum mechanics ; Physics ; Statistical physics ; Computer science ; Quantum ; Mathematics ; Statistics ; Thermodynamics ; Biology Magnetism in coordination complexes ; Electron Spin Resonance Studies ; Lanthanide and Transition Metal Complexes
Authors: Anne Frommelius | Konstantin G. Wirth | Thorsten Ohlerth | Dario Siebenkotten | Simon Wintersteller | Ahed Abouserie | Hongchu Du | Joachim Mayer | Maksym Yarema | Thomas Taubner | Ulrich Simon
Source: Small (article, 2024-07-11)
Field: Materials Science — Materials Chemistry

3D Confinement Stabilizes the Metastable Amorphous State of Antimony Nanoparticles – A New Material for Miniaturized Phase Change Memories? The wet-chemical synthesis of 3D confined antimony nanoparticles (Sb-NP) at low and high temperatures is described. Using reaction conditions that are mild in temperature and strong in reducing power allows the synthesis of amorphous Sb-NP stabilized with organic ligands. Exchanging the organic ligand 1-octanethiol by iodide enabled to investigate the unusual strong stability of this metastable material through simultaneous thermal analysis combining differential scanning calorimetry and thermogravimetric analysis. Additionally, in situ high temperature powder x-ray diffraction (p-XRD) shows a significant increase in stabilization of the amorphous phase in comparison to thin layered, 1D confined Sb or bulk material. Further, it is shown with scattering-type scanning near-field optical microscopy (s-SNOM) experiments that the optical response of the different phases in Sb-NP make the distinctness of each phase possible. It is proposed that the Sb-NP introduced here can serve as a 3D-confined optically addressable nanomaterial of miniaturized phase change memory devices. Amorphous solid ; Thermogravimetric analysis ; Materials science ; Differential scanning calorimetry ; Nanoparticle ; Nanomaterials ; Antimony ; Phase (matter) ; Thermal stability ; Metastability ; Chemical engineering ; Nanotechnology ; Analytical Chemistry (journal) ; Crystallography ; Chemistry ; Organic chemistry ; Metallurgy Phase-change materials and chalcogenides ; Chalcogenide Semiconductor Thin Films ; Perovskite Materials and Applications
Authors: Anna Prioriello | Laura Fazi | Pietro Morales | Leonardo Duranti | David Della‐Morte | Francesca Pacifici | Manfredi Tesauro | Michelina Soccio | Nadia Lotti | Laura Capozzoli | Giovanni Romanelli | Luca Tortora | Silvia Licoccia
Source: Emergent Materials (article, 2024-10-25)
Field: Materials Science — Materials Chemistry

Nanocarbon and medicine: polymer/carbon nanotube composites for medical devices Abstract In view of wide-ranging application to the biomedical field, this work investigates the mechanical and electrical properties of a composite made of Single Wall Carbon Nanotubes (SWCNT) bundles self-grafted onto a poly-dimethyl-siloxane (PDMS) elastomer, particularly Sylgard 184, that has well assessed biocompatible properties and is commonly used in prosthetics. Due to the potential risks associated with the use of carbon nanostructures in implanted devices, we also assess the viability of cells directly grown on such composite substrates. Furthermore, as the stability of conductive, stretchable devices made of such composite is also crucial to their use in the medical field, we investigate, by different experimental techniques, the grafting of SWCNT bundles deep into PDMS films. Our findings prove that penetration of SWCNT bundles into the polymer bulk depends on heating time and carbon nanotubes can be seen beyond 150 μm from the surface. This is confirmed by direct electron microscopy observation of large bundles as deep as about 20 μm. The composites exhibit reliable mechanical and electrical responses that are more suitable to large and repeated deformation of the polymer with respect to thermoplastic based composites, suggesting a wide potential for their application to stretchable biomedical devices. Aiming at the proposed application of artificial bladders, a bladder prototype made of poly-dimethyl siloxane endowed with a printed SWCNT-based strain sensor was developed. Carbon nanotube ; Materials science ; Composite material ; Polymer ; Carbon nanotube metal matrix composites ; Nanotube ; Nanotechnology Carbon Nanotubes in Composites ; Neuroscience and Neural Engineering ; Nanotechnology research and applications
Authors: Yong-Jyun Wang | Zi‐Liang Yang | Jiawei Chen | Ruixue Zhu | Shang‐Hsien Hsieh | Sen-Hao Chang | Hongyuan Lin | Chun‐Liang Lin | Yi‐Chun Chen | Chia‐Hao Chen | Bo-Chao Huang | Ya‐Ping Chiu | Chao‐Hui Yeh | Peng Gao | Po‐Wen Chiu | Yi-Cheng Chen | Ying‐Hao Chu
Source: ACS Applied Materials & Interfaces (article, 2024-05-15)
Field: Materials Science — Materials Chemistry

Nonvolatile Modulation of Bi<sub>2</sub>O<sub>2</sub>Se/Pb(Zr,Ti)O<sub>3</sub> Heteroepitaxy The pursuit of high-performance electronic devices has driven the research focus toward 2D semiconductors with high electron mobility and suitable band gaps. Previous studies have demonstrated that quasi-2D Bi<sub>2</sub>O<sub>2</sub>Se (BOSe) has remarkable physical properties and is a promising candidate for further exploration. Building upon this foundation, the present work introduces a novel concept for achieving nonvolatile and reversible control of BOSe's electronic properties. The approach involves the epitaxial integration of a ferroelectric PbZr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> (PZT) layer to modify BOSe's band alignment. Within the BOSe/PZT heteroepitaxy, through two opposite ferroelectric polarization states of the PZT layer, we can tune the Fermi level in the BOSe layer. Consequently, this controlled modulation of the electronic structure provides a pathway to manipulate the electrical properties of the BOSe layer and the corresponding devices. Materials science ; Modulation (music) ; X-ray crystallography ; Crystallography ; Optoelectronics ; Diffraction ; Optics Electronic and Structural Properties of Oxides ; 2D Materials and Applications ; Gas Sensing Nanomaterials and Sensors
Authors: Vikram V. Karve | Alexandre Mabillard | Jordi Espín | Mehrdad Asgari | Wendy L. Queen | Mathieu Soutrenon
Source: Materials Research Express (article, 2024-05-01)
Field: Chemistry — Inorganic Chemistry

Densification and shaping of pure Cu-BTC powders using a solid-state chemical transformation Abstract MOFs are a class of porous crystalline materials whose unique properties have led to applicability in several fields ranging from gas adsorption to drug delivery. Despite their high potential, MOFs are usually found as fine powders, a property that can limit their use in industrial applications. Here, a novel approach is proposed to form densified Cu-MOF (Cu-BTC) powders and monoliths using 1,2-ethanedisulfonic acid (EDSA) as a densification agent. A MOF/EDSA mixture was heated to ∼150 °C; the molten EDSA not only promotes the growth of larger MOF crystallites, but also stimulates condensation reactions between the carboxylate-based MOF ligands, further binding the particles together. When this reaction was done in a stainless-steel die under pressure MOF-based monoliths could also be formed. Notably, using this approach, the MOF had a higher density, significantly improving the volumetric CO 2 adsorption capacity. We believe this contribution provides the basis for future work wherein the intrinsic MOF particle surfaces can be selectively engineered to improve their properties towards shaping for industrial applications. Materials science ; Porosity ; Adsorption ; Chemical engineering ; Particle (ecology) ; Crystallite ; Solid-state ; Nanotechnology ; Condensation ; Particle size ; Composite material ; Metallurgy ; Organic chemistry ; Chemistry ; Physical chemistry ; Thermodynamics Metal-Organic Frameworks: Synthesis and Applications ; Advanced ceramic materials synthesis ; Advanced materials and composites
Authors: Navneet Singh | Vanika Mahant | Ridhima Bhasin | Kunika Verma | Anupam Kumar | Ashish Kumar Vyas
Source: Indian Journal of Microbiology (article, 2024-06-27)
Field: Chemistry — Organic Chemistry

Antimicrobial and Computational Studies of Newly Synthesized Benzotriazoles Antimicrobial ; Chemistry ; Combinatorial chemistry ; Organic chemistry Synthesis and biological activity ; Computational Drug Discovery Methods ; Multicomponent Synthesis of Heterocycles
Authors: Kunihiko Kato | Takashi Shirai
Source: Scientific Reports (article, 2024-11-15)
Field: Materials Science — General Materials Science

Multi-step thermal design of microwave vacuum heating to basaltic regolith simulant towards lunar base construction Humanned exploration and extended stay on the Moon are the hottest challenges today. We report highly robust materials by microwave heating under high-vacuum conditions (10<sup>- 3</sup> Pa) from a basaltic regolith simulant (FJS-1) to ensure the feasibility of lunar infrastructure construction. The violent degassing dynamics were revealed by monitoring vacuum pressure during heating and analyzing the compounds evolved from basaltic silicate compounds: thermal pyrolysis of silicate compounds became more pronounced above 1000 <sup>o</sup>C, leading to a catastrophic deformation accompanied by forming countless pores of several hundred µm sizes. The preferential formation of the magnetite phase in vacuum heating dominantly caused the radical change in microwave absorption capacity compared with conventional heating routes using an electrical furnace in atmospheric conditions. Besides, the in-situ measurement of dielectric properties during microwave vacuum heating clarified the increase in one order of magnitude from 100 to 1000 <sup>o</sup>C. Based on the presumed phenomena during microwave-vacuum heating for basaltic regolith, we propose a new thermal design concept to overcome the practical limitations of microwave technology. The multi-step temperature profile successfully fabricated a highly robust product that demonstrated world-class mechanical performance, equivalent to the compressive strength of 65 MPa without any vigorous hydrostatic cold press as a pre-treatment. Regolith ; Basalt ; Microwave ; Materials science ; Thermal ; Silicate ; Magnetite ; Ultra-high vacuum ; Hydrostatic equilibrium ; Absorption (acoustics) ; Composite material ; Mineralogy ; Astrobiology ; Nanotechnology ; Chemical engineering ; Geology ; Metallurgy ; Thermodynamics Material Properties and Applications ; Advanced ceramic materials synthesis ; Microwave-Assisted Synthesis and Applications
Authors: Yukiho Yoshida | Masaya Sawamura | Y. Shimizu
Source: Organic Letters (article, 2024-06-19)
Field: Chemistry — Organic Chemistry

Boron-Catalyzed Michael Reaction of Donor–Acceptor Carboxylic Acid Pairs Enabling Direct Synthesis of 1,5-Dicarboxylic Acids A boron-catalyzed Michael reaction using pairs of carboxylic acids was developed. The reaction occurs through dual activation of the two substrates by a boron catalyst, which facilitates boron enolate formation from the donor carboxylic acid with simultaneous activation of the α,β-unsaturated carboxylic acid as the acceptor. α-Aryl and α-alkenyl carboxylic acids were applicable as donors. The versatility and utility of this reaction were demonstrated by the direct use of pharmaceuticals as donor carboxylic acids. Chemistry ; Boron ; Carboxylic acid ; Catalysis ; Acceptor ; Aryl ; Organic chemistry ; Michael reaction ; Combinatorial chemistry Organoboron and organosilicon chemistry ; Synthetic Organic Chemistry Methods ; Asymmetric Synthesis and Catalysis
Authors: Mohammad Hashem Sedghkerdar | Umang Patel | Nader Mahinpey
Source: The Canadian Journal of Chemical Engineering (article, 2024-05-27)
Field: Chemistry — Inorganic Chemistry

Conversion of tailings solvent recovery unit ( <scp>TSRU</scp> ) by‐products into activated carbon‐zeolite composites: Impact of fusion pre‐treatment on porosity and <scp> CO <sub>2</sub> </scp> capture Abstract Currently, the oil sands industry is producing millions of tons of tailings by‐products from the tailings solvent recovery unit (TSRU) into the tailings ponds. TSRU tailings (TTs) consist of water, asphaltene, and minerals, including silica and alumina mixtures. The oil sands sector has expanded efforts to discover solutions to remove the tailings ponds due to growing public concern about the environmental effects of these ponds and stiffer government rules on their disposal. Therefore, this report studied the effect of the different methods for the conversion of the TTs into the activated carbon‐zeolite composite. The TTs were treated with activation followed by hydrothermal, either with or without fusion with NaOH at 800°C for 1 h as a pre‐treatment. Zeolite Na‐P, zeolite A, and zeolite X were identified during the different characterizations, depending on the pre‐treatment of the fusion. The result showed that the fusion with NaOH before the hydrothermal reaction was effective as it increased the porosity and adsorption of the composite. The CO 2 capture capacity of the product before fusion was 0.19 mmol/g, and after fusion, it was improved to 0.486 mmol/g. Activated carbon ; Zeolite ; Porosity ; Chemistry ; Fusion ; Waste management ; Tailings ; Chemical engineering ; Materials science ; Composite material ; Adsorption ; Organic chemistry ; Catalysis ; Engineering Zeolite Catalysis and Synthesis ; Radioactive element chemistry and processing ; Extraction and Separation Processes
Authors: Aurel Nechita | Laura BUJOREANU-BEZMAN | Carmen Tiutiucă | Dinu Bogdan Tiutiuca
Source: Medicine and Materials (article, 2024-12-15)
Field: Materials Science — Biomaterials

HYDROGELS IN NEUROSURGERY/NEUROREGENERATION, APPLICATIONS AND PERSPECTIVES Hydrogels represent a promising class of biomaterials used in neurosurgery and neuroregeneration due to their high biocompatibility, adjustable mechanical properties, and ability to mimic the natural extracellular matrix. This review explores their diverse applications, from neural tissue repair and peripheral nerve regeneration, to cell therapies and controlled drug delivery. Their unique properties, such as in situ gelling and porosity, allow them to provide effective structural support and facilitate neuronal regeneration. Recent developments highlight the use of hydrogels functionalized with growth factors or nanoparticles to improve axonal regeneration and integration with existing tissues. At the same time, biodegradability challenges, incomplete integration with tissues and high costs are significant barriers to their widespread application. The future of research in this field focuses on the development of personalized hydrogels, integration with 3D-printing technologies and the creation of smart materials responsive to stimuli. These advances can revolutionize treatments for central and peripheral nervous system injuries, providing innovative and effective solutions for patients. Therefore, hydrogels have the potential to fundamentally transform therapeutic approaches in neurosurgery and neuroregeneration. Neuroregeneration ; Neurosurgery ; Self-healing hydrogels ; Neuroscience ; Medicine ; Biology ; Surgery ; Chemistry ; Central nervous system Electrospun Nanofibers in Biomedical Applications ; Tissue Engineering and Regenerative Medicine ; Hydrogels: synthesis, properties, applications
Authors: Erwin Erwin | Didik Sugiyanto | Danny Faturahman | Yefri Chan | Husen Asbanu
Source: Eastern-European Journal of Enterprise Technologies (article, 2024-08-30)
Field: Materials Science — Materials Chemistry

Effect of the brass waste recycling process on mechanical properties with investment casting for gear materials This study is an experimental research to analyze the characteristics and mechanical properties of the casting process of recycled brass alloy, which will be used as a material for gears. Currently, the remaining production and waste from brass alloys continue to increase. Another thing is the increase in the need for brass gears, so environmentally friendly material engineering is needed to provide good quality and efficient energy use, especially during the casting process. The casting process uses an electric furnace that melts brass alloys at 526 up to 900 °C within 1 hour and molds to make test specimens. The results of microstructural testing for grain size in recycled brass alloys range from 74.63 μm to 84.57 μm. The maximum tensile strength produced is up to 225.2 MPa, the maximum yield strength is up to 179.8 MPa, and the maximum elongation is up to 7.3 %. The roughness of recycled brass alloys has a maximum Ra value (average roughness) of up to 0.836 μm. Validation was carried out by comparing the mechanical properties of CAC 302 brass products and the study results. The data shows that recycled brass's maximum yield strength value is 179.8 MPa and CAC 302 brass material is 175 MPa, but for the ultimate tensile strength value, the value of recycled brass is far below CAC 302 products. These results can be a consideration for the industry to be able to use recycled brass alloys for gear products because the yield strength value is not far from CAC 302 brass products. The impact result of this study produces recycled brass alloys that are environmentally friendly, efficient in smelting energy consumption, and have good yield strength. The results of this research can benefit the manufacture of gear components made of brass alloys. Brass ; Investment casting ; Process (computing) ; Casting ; Investment (military) ; Metallurgy ; Materials science ; Waste management ; Manufacturing engineering ; Process engineering ; Engineering ; Composite material ; Computer science ; Copper Metallurgy and Material Science ; Aluminum Alloys Composites Properties ; Aluminum Alloy Microstructure Properties
Authors: Molly Lightowler | Shuting Li | Xiao Ou | Jungyoun Cho | Binbin Liu | Ao Li | Gerhard Höfer | Jiaoyan Xu | Taimin Yang | Xiaodong Zou | Ming Lü | Hongyi Xu
Source: Angewandte Chemie (article, 2024-02-21)
Field: Materials Science — Materials Chemistry

Phase Identification and Discovery of an Elusive Polymorph of Drug‐Polymer Inclusion Complex Using Automated 3D Electron Diffraction Abstract 3D electron diffraction (3D ED) has shown great potential in crystal structure determination in materials, small organic molecules, and macromolecules. In this work, an automated, low‐dose and low‐bias 3D ED protocol has been implemented to identify six phases from a multiple‐phase melt‐crystallisation product of an active pharmaceutical ingredient, griseofulvin (GSF). Batch data collection under low‐dose conditions using a widely available commercial software was combined with automated data analysis to collect and process over 230 datasets in three days. Accurate unit cell parameters obtained from 3D ED data allowed direct phase identification of GSF Forms III, I and the known GSF inclusion complex (IC) with polyethylene glycol (PEG) (GSF‐PEG IC‐I), as well as three minor phases, namely GSF Forms II, V and an elusive new phase, GSF‐PEG IC‐II. Their structures were then directly determined by 3D ED. Furthermore, we reveal how the stabilities of the two GSF‐PEG IC polymorphs are closely related to their crystal structures. These results demonstrate the power of automated 3D ED for accurate phase identification and direct structure determination of complex, beam‐sensitive crystallisation products, which is significant for drug development where solid form screening is crucial for the overall efficacy of the drug product. Drug discovery ; Inclusion (mineral) ; Electron diffraction ; Identification (biology) ; Polymer ; Materials science ; Crystallography ; Diffraction ; Polymer science ; Chemistry ; Nanotechnology ; Organic chemistry ; Physics ; Mineralogy ; Biology ; Biochemistry ; Optics X-ray Diffraction in Crystallography ; Crystallography and molecular interactions ; Crystallization and Solubility Studies