jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Gerardo Salinas | Serena Arnaboldi | Patrick Garrigue | Alexander Kuhn
Source: Advanced Materials Interfaces (article, 2023-03-22)
Field: Materials Science — Polymers and Plastics

Controlled Patterning of Complex Resistance Gradients in Conducting Polymers with Bipolar Electrochemistry Abstract Conducting polymers have gained considerable attention for the possible design of localized electroactive patterns for microelectronics. In this work, the authors take advantage of the properties of polypyrrole, in synergy with a wireless polarization, triggered by bipolar electrochemistry, to produce localized resistance gradient patterns. The physicochemical modification is caused by the reduction and overoxidation of polypyrrole, which produces highly resistive regions at different positions along the conducting substrate at predefined locations. Due to the outstanding flexibility of polypyrrole, U‐, S‐, and E‐shaped bipolar electrodes can be formed for prove‐of‐concept experiments, and electrochemically modified in order to generate well‐defined resistance gradients. Energy‐dispersive X‐ray spectroscopy analysis of the samples confirms the localized physicochemical modifications. This approach presents as main advantages the wireless nature of bipolar electrochemistry and the possible fine‐tuning of the spatial distribution of the electrochemical modification, in comparison with more conventional patterning methods. Polypyrrole ; Materials science ; Conductive polymer ; Electrode ; Electrochemistry ; Microelectronics ; Polymer ; Resistive touchscreen ; Nanotechnology ; Polarization (electrochemistry) ; Cyclic voltammetry ; Optoelectronics ; Composite material ; Computer science ; Polymerization ; Chemistry Conducting polymers and applications ; Advanced Sensor and Energy Harvesting Materials ; Organic Electronics and Photovoltaics
Authors: Ben Zhang | Yang Zhou | Chang Dong | Yi Xiang | Yanbo Shi | Chennan Zhang | Aihua Yuan | Shaojun Zheng | Zhao‐Yang Li | Yi‐Quan Zhang | Yong Yang | Lei Chen
Source: Dalton Transactions (article, 2023-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Boosting the mono-axial crystal field in stable high-coordinate Dy(<scp>iii</scp>) single-ion magnets by substitution of the phenoxy axial ligand Synthesis of air-stable and high-performance single-molecule magnets (SMMs) is challenging. Here, a heptadentate pentapyridyldiamine (BPA-TPA) ligand and fine-tuned axial phenoxy ligands are used to synthesize two triangular dodecahedral Dy(III) complexes [Dy(BPA-TPA)(4-methoxy-PhO)](BPh<sub>4</sub>)<sub>2</sub>·3CH<sub>2</sub>Cl<sub>2</sub> (4) and [Dy(BPA-TPA)(2,4-dimethyl-PhO)](BPh<sub>4</sub>)<sub>2</sub>·0.85CH<sub>2</sub>Cl<sub>2</sub> (5). Both complexes have high effective barriers exceeding 400 K and magnetic hysteresis up to 8 K, which is ascribed to one strong and short Dy-O bond combined with seven weak Dy-N bonds. <i>Ab initio</i> calculations reveal the thermally activated quantum tunneling of magnetization through the first excited Kramers doublet, due to the presence of a strong axial Dy-O crystal ligand. Substitution of the phenoxy ligand leads to more constrained vibrations, improving the magnetic hysteresis behavior for 5. Substitution (logic) ; Ligand (biochemistry) ; Single crystal ; Boosting (machine learning) ; Crystallography ; Ion ; Magnet ; Chemistry ; Materials science ; Stereochemistry ; Organic chemistry ; Engineering ; Mechanical engineering ; Computer science ; Receptor Magnetism in coordination complexes ; Lanthanide and Transition Metal Complexes ; Advanced NMR Techniques and Applications
Authors: Priya Kedia | Yogesh Badhe | Rakesh Gupta | Shankar B. Kausley | Beena Rai
Source: Journal of Food Engineering (article, 2023-08-05)
Field: Materials Science — Biomaterials

Modeling the effect of pH on the permeability of dried chitosan film Chitosan ; Solubility ; Permeation ; Oxygen permeability ; Chemical engineering ; Chemistry ; Permeability (electromagnetism) ; Water vapor ; Oxygen ; Coating ; Organic chemistry ; Membrane Nanocomposite Films for Food Packaging ; Microencapsulation and Drying Processes ; Postharvest Quality and Shelf Life Management
Authors: Kailash | S. S. Verma
Source: Optical and Quantum Electronics (article, 2023-03-25)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Thermoplasmonic study of AuxAg(1−x) alloy nanospheres Materials science ; Alloy ; Bimetallic strip ; Photothermal therapy ; Nanoparticle ; Surface plasmon resonance ; Nanoshell ; Plasmon ; Absorption (acoustics) ; Nanotechnology ; Chemical engineering ; Metal ; Optoelectronics ; Composite material ; Metallurgy Gold and Silver Nanoparticles Synthesis and Applications ; nanoparticles nucleation surface interactions ; Thermal Radiation and Cooling Technologies
Authors: Michael F. Wolff | Alexander Schwiers | Kai Wilkner | Doris Sebold | Norbert H. Menzler
Source: Journal of Power Sources (article, 2023-12-11)
Field: Materials Science — Materials Chemistry

Wet powder spraying – A versatile and highly effective technique for the application of spinel-type protective coatings on SOC interconnects Chromia-forming metallic interconnects used for solid oxide cells require protective coatings to prevent chromium poisoning of other cell components. This study focuses on Mn1.0Co1.9Fe0.1O4 -coated Crofer 22 H interconnects fabricated by wet powder spraying, which is a versatile, cost-effective, and scalable coating technique. The investigation and fine-tuning of relevant parameters along the process chain provide a fundamental understanding of their impact on coating quality and thermomechanical stability. The correlation with cross-sectional analysis and area-specific contact resistance (ASR) measurements supports the parameter evaluation. Mid-term thermal testing demonstrates excellent chromium retention, as well as chemical and mechanical stability of the protective layer on real component interconnect substrates. With an ASR below 10 mΩ cm2 after 1000 h at 800 °C, wet powder spraying represents a viable alternative to established but more expensive processes. Materials science ; Chromia ; Coating ; Spinel ; Interconnection ; Chromium ; Oxide ; Layer (electronics) ; Thermal stability ; Solid oxide fuel cell ; Composite material ; Metallurgy ; Chemical engineering ; Electrode ; Computer science Advancements in Solid Oxide Fuel Cells ; Advanced materials and composites ; Advanced ceramic materials synthesis
Authors: Shunsuke Sasaki | Simon J. Clarke | Stéphane Jobic | Laurent Cario
Source: ACS Organic & Inorganic Au (article, 2023-11-07)
Field: Materials Science — Materials Chemistry

Anionic Redox Topochemistry for Materials Design: Chalcogenides and Beyond Topochemistry refers to a generic category of solid-state reactions in which precursors and products display strong filiation in their crystal structures. Various low-dimensional materials are subject to this stepwise structure transformation by accommodating guest atoms or molecules in between their 2D slabs or 1D chains loosely bound by van der Waals (vdW) interactions. Those processes are driven by redox reactions between guests and the host framework, where transition metal cations have been widely exploited as the redox center. Topochemistry coupled with this cationic redox not only enables technological applications such as Li-ion secondary batteries but also serves as a powerful tool for structural or electronic fine-tuning of layered transition metal compounds. Over recent years, we have been pursuing materials design beyond this cationic redox topochemistry that was mostly limited to 2D or 1D vdW systems. For this, we proposed new topochemical reactions of non-vdW compounds built of 2D arrays of anionic chalcogen dimers alternating with redox-inert host cationic layers. These chalcogen dimers were found to undergo redox reaction with external metal elements, triggering either (1) insertion of these metals to construct 2D metal chalcogenides or (2) deintercalation of the constituent chalcogen anions. As a whole, this topochemistry works like a "zipper", where reductive cleavage of anionic chalcogen-chalcogen bonds opens up spaces in non-vdW materials, allowing the formation of novel layered structures. This Perspective briefly summarizes seminal examples of unique structure transformations achieved by anionic redox topochemistry as well as challenges on their syntheses and characterizations. Chalcogen ; Redox ; Cationic polymerization ; Chemistry ; van der Waals force ; Transition metal ; Metal ; Molecule ; Crystallography ; Inorganic chemistry ; Polymer chemistry ; Organic chemistry ; Catalysis 2D Materials and Applications ; Crystal Structures and Properties ; Metal-Organic Frameworks: Synthesis and Applications
Authors: Huangjie Lu | Zhaofa Zheng | Huiliang Hou | Yaoyao Bai | Jie Qiu | Jian‐Qiang Wang | Jian Lin
Source: Advanced Science (article, 2023-11-08)
Field: Chemistry — Inorganic Chemistry

Fine‐Tuning X‐Ray Sensitivity in Organic–Inorganic Hybrids via an Unprecedented Mixed‐Ligand Strategy Crystalline organic-inorganic hybrids, which exhibit colorimetric responses to ionizing radiation, have recently been recognized as promising alternatives to conventional X-ray dosimeters. However, X-ray-responsive organic-inorganic hybrids are scarce and the strategy to fine-tune their detection sensitivity remains elusive. Herein, an unprecedented mixed-ligand strategy is reported to modulate the X-ray detection efficacy of organic-inorganic hybrids. Deliberately blending the stimuli-responsive terpyridine carboxylate ligand (tpc<sup>-</sup> ) and the auxiliary pba<sup>-</sup> group with different ratios gives rise to two OD thorium-bearing clusters (Th-102 and Th-103) and a 1D coordination polymer (Th-104). Notably, distinct X-ray sensitivity is evident as a function of molar ratio of the tpc<sup>-</sup> ligand, following the trend of Th-102 > Th-103 > Th-104. Moreover, Th-102, which is exclusively built from the tpc<sup>-</sup> ligands with the highest degree of π-π interactions, exhibits the most sensitive radiochromic and fluorochromic responses toward X-ray with the lowest detection limit of 1.5 mGy. The study anticipates that this mixed-ligand strategy will be a versatile approach to tune the X-ray sensing efficacy of organic-inorganic hybrids. Ligand (biochemistry) ; Thorium ; X-ray ; Hybrid ; Materials science ; Chemistry ; Uranium ; Optics ; Physics ; Biology Metal-Organic Frameworks: Synthesis and Applications ; Radioactive element chemistry and processing ; Lanthanide and Transition Metal Complexes
Authors: Guanting Li | Fengli Xia | Hongying Xiao | Shunzhe Zheng | Shuwen Fu | Han Qiao | Qianhui Jin | Xuanbo Zhang | Dun Zhou | Chutong Tian | Jin Sun | Zhonggui He | Bingjun Sun
Source: Nano Research (article, 2023-08-30)
Field: Materials Science — Biomaterials

Fine-tuning the structure-tolerance-antitumor efficacy axis of prodrug nanoassemblies via branched aliphatic functionalization Small-molecule prodrug nanoassemblies have emerged as efficient antitumor drug delivery systems. However, in the case of camptothecins-based prodrug nanoassemblies, linear aliphatic side chain modification often results in rod-shaped or irregularly shaped nanoassemblies, which are highly unfavorable for sterilization through filtration, and may cause capillary blockage upon intravenous injection. The rational design of camptothecins-based prodrug nanoassemblies remains a challenge. Herein, we propose that branched aliphatic alcohol (BAA) functionalization could fine-tune the structure-tolerance-antitumor efficacy axis of prodrug nanoassemblies. Correspondingly, four SN38-BAA prodrugs were synthesized by conjugating 7-ethyl-10-hydroxycamptothecin (SN38) with BAAs of varying lengths via a tumor redox-responsive disulfide bond, which self-assemble into uniform spherical nanoparticles. The length of BAA was found to significant impact the multiple drug delivery process, including colloidal stability, drug release profiles and pharmacokinetics. Overall, SN38-C21 NPs (SN38-11-heneicosanol nanoparticles), featuring the longest BAA, showcased multiple therapeutic advantages, ultimately culminating the optimal antitumor efficacy and tolerance. The findings underscore the potential of BAA functionalization in strengthening the therapeutic outcomes of prodrug nanoassemblies, and provide valuable insights for developing translational camptothecins-based nanomedicines. Prodrug ; Rational design ; Nanomedicine ; Drug delivery ; Surface modification ; Combinatorial chemistry ; Nanoparticle ; Camptothecin ; Small molecule ; Chemistry ; Nanotechnology ; Drug ; Materials science ; Pharmacology ; Organic chemistry ; Biochemistry ; Medicine Nanoparticle-Based Drug Delivery ; Cancer therapeutics and mechanisms ; Advanced biosensing and bioanalysis techniques
Authors: Cheng Jih | Chih‐Hsien Chen
Source: Journal of Photochemistry and Photobiology A Chemistry (article, 2023-10-11)
Field: Materials Science — Materials Chemistry

Role of π-bridge and strong solid-state emission in triphenylamine-benzothiazole based nonlinear optical dyes Triphenylamine ; Benzothiazole ; Chromophore ; Photochemistry ; Fluorophore ; Electroluminescence ; Fluorescence ; Solvatochromism ; Quantum yield ; Materials science ; Acceptor ; Chemistry ; Intramolecular force ; Solvent ; Organic chemistry ; Nanotechnology ; Optics Luminescence and Fluorescent Materials ; Nonlinear Optical Materials Studies ; Porphyrin and Phthalocyanine Chemistry
Authors: Mahsa Namvari | V. A. Chernenko | Andrey Saren | José Porro | K. Ullakko
Source: Journal of Alloys and Compounds (article, 2023-02-09)
Field: Materials Science — Materials Chemistry

Structure-property control of polycrystalline Ni-Mn-Ga by moderate Co-doping It is well-known that the Co-doping of ferromagnetic shape memory alloys (FSMAs) is a crucial tool to control their multifunctional properties. The present work investigates the use of small quantities of Co to fine-tune the transformation, structure, microstructure, mechanical and magnetic properties of the polycrystalline Ni49.8Mn28.5Ga21.7 (at.%) alloy, as the representative of the most elaborated magnetostrain-active Ni-Mn-Ga FSMAs. A series of seven alloys, undoped and doped with 0.5, 1, 1.5, 2, 3, and 4 at.% Co, was fabricated using a standard induction melting technique with subsequent heat treatment. Alongside establishing the evolution of the basic characteristics as a function of the Co content in this series, an unusual effect of Co-doping on the grain microstructure was found. A Co-doping up to 1.5 at.% instead of Mn significantly increased the average grain size while importantly maintaining the 10 M martensitic crystal structure. At Co concentrations of 1-1.5 at.%, a microstructure with an average grain size of about 2.00 mm was formed with a twin structure, enabling the experimental observation of magnetic-field-induced twin variant rearrangement. At higher levels of Co-doping, the grain size was essentially reduced, and the crystal structure of the martensitic phase became 2 M martensite. The decreasing grain size and changing crystal structure are attributed to the progress of γ-phase precipitates. Alongside the academic aspect, the results of the present work point to the commercial advantage of fabricating 10 M Co-doped Ni-Mn-Ga actuating elements made from large grains of polycrystalline ingots obtained by a standard melting facility instead of grown single crystals. Materials science ; Microstructure ; Grain size ; Doping ; Crystallite ; Crystal structure ; Martensite ; Ferromagnetism ; Magnetic shape-memory alloy ; Alloy ; Shape-memory alloy ; Crystallography ; Metallurgy ; Condensed matter physics ; Magnetization ; Magnetic domain ; Magnetic field ; Optoelectronics ; Chemistry Shape Memory Alloy Transformations
Authors: Mansour Zaremanesh | Ali Bahrami
Source: Physica Scripta (article, 2023-12-29)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Two-dimensional honeycomb lattice structure for underwater acoustic cloaking using pentamode materials Abstract This research article presents an innovative and novel approach to achieve underwater acoustic cloaking using a two-dimensional honeycomb lattice structure with pentamode materials in the kHz frequency range. Underwater acoustic cloaking holds substantial importance in various applications, such as marine engineering, imaging, and military operations, making the development of an efficient underwater acoustic shell imperative. The proposed cloak consists of a pentamode titanium material honeycomb lattice embedded in an air background, submerged in water. To attain effective camouflage and regulate the phase and energy flow, impedance matching was applied to the overall geometry of the structure. By fine-tuning the structural parameters of the cloaking shell, derived from the effective mass velocity and density for recovering reflected waves, impedance matching with water was ensured. Through simulation calculations and optimization design, the average total scattering cross-section of the acoustic cloak is determined to be 0.1. The results demonstrate that the pentamode material-based cloaking approach is not only suitable and efficient in achieving the cloaking phenomenon but also enhances operator flexibility. The operating frequency bandwidth of the acoustic cloaking system is approximately 8 kHz for lattice constant a = 5 mm. These findings pave the way for further advancements in underwater acoustic cloaking technologies. Cloaking ; Cloak ; Underwater ; Acoustics ; Bandwidth (computing) ; Lattice (music) ; Metamaterial ; Physics ; Acoustic wave ; Materials science ; Optics ; Computer science ; Geology ; Telecommunications Metamaterials and Metasurfaces Applications ; Advanced Antenna and Metasurface Technologies ; Acoustic Wave Phenomena Research
Authors: Rita de Cássia F. Bezerra | Gabriela Mota | Ruth Maria B. Vidal | Gilberto D. Saraiva | Alcinéia C. Oliveira | A.J. Ramiro de Castro | Rinaldo dos Santos Araújo | Elena Rodríguez‐Aguado | José Jiménez Jiménez | Enrique Rodrı́guez-Castellón
Source: Molecular Catalysis (article, 2023-08-07)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Multifunctional properties of alumina-based graphene nanocomposites as catalysts for esters of glycerol production Graphene ; Nanocomposite ; X-ray photoelectron spectroscopy ; High-resolution transmission electron microscopy ; Materials science ; Fourier transform infrared spectroscopy ; Chemical engineering ; Catalysis ; Raman spectroscopy ; Scanning electron microscope ; Transmission electron microscopy ; Nanotechnology ; Chemistry ; Organic chemistry ; Composite material Supercapacitor Materials and Fabrication ; Graphene research and applications ; Graphene and Nanomaterials Applications
Authors: Kelcilene B. R. Teodoro | Maycon Jhonny da Silva | Rafaela S. André | Rodrigo Schneider | Maria Alice Martins | L. H. C. Mattoso | Daniel S. Côrrea
Source: Carbohydrate Polymers (article, 2023-10-14)
Field: Materials Science — Biomaterials

Exploring the potential of cellulose autofluorescence for optical detection of tannin in red wines Cellulose ; Autofluorescence ; Context (archaeology) ; Fluorescence ; Materials science ; Tannin ; Photoluminescence ; Nanotechnology ; Chemistry ; Optoelectronics ; Optics ; Organic chemistry ; Food science Advanced Cellulose Research Studies ; Biosensors and Analytical Detection ; Nanocomposite Films for Food Packaging
Authors: Marina V. Volostnykh | Gayane A. Kirakosyan | Anna А. Sinelshchikova | Polina A. Loboda | Павел В. Дороватовский | Maxim A. Mikhaylov | А. Yu. Tsivadze | Maxim N. Sokolov⧫ | Yulia G. Gorbunova
Source: Dalton Transactions (article, 2023-01-01)
Field: Materials Science — Materials Chemistry

Supramolecular hybrids based on Ru(<scp>ii</scp>) porphyrin and octahedral Mo(<scp>ii</scp>) iodide cluster The coordination-driven design and synthesis of new stable supramolecular cluster-porphyrin (CP) hybrids based on an A<sub>2</sub>-type ruthenium porphyrin 5,15-bis[(<i>p</i>-tolyl)porphyrinato(2-)]ruthenium(carbonyl)(aqua) [RuDTolP(CO)H2O] and an octahedral molybdenum(II) iodide cluster with six terminal isonicotinate ligands (Bu<sub>4</sub>N)<sub>2</sub>[{Mo<sub>6</sub>I<sub>8</sub>}(OOC-C<sub>5</sub>H<sub>4</sub>N)<sub>6</sub>] (PyMoC) are reported. The stepwise supramolecular assembly of the PyMoC "superoctahedron" with RuDTolP(CO)H2O has been studied by <sup>1</sup>H NMR and 2D <sup>1</sup>H-<sup>1</sup>H COSY, <sup>1</sup>H-<sup>15</sup>N HMBC and DOSY techniques, as well as by UV-vis spectroscopy and HR-ESI mass spectrometry. The formation of discrete cluster-porphyrin CPn adducts with different numbers of coordinated porphyrins (<i>n</i> = 1-6), including the geometrical isomers of CP2, CP3 and CP4, has been observed. Using a double equivalent amount of RuDTolP(CO)H2O relative to the cluster (C : P ratio 1 : 12) affords a mixture of CP5 and CP6 species in solution, while only the CP6 complex is crystallized from this system. Fine tuning of crystallization conditions leads to the formation of a more complex architecture CP6+2, where the CP6 assembly incorporates two additional porphyrin molecules bound to the cluster core by hydrogen bonds. Thus, the coordination-based supramolecular approach provides new stable cluster-multiporphyrin 3D arrays based on two types of photosensitizers, which can be promising for the design of photoactive materials. Porphyrin ; Supramolecular chemistry ; Chemistry ; Ruthenium ; Crystallography ; Cluster (spacecraft) ; Octahedron ; Proton NMR ; Stereochemistry ; Iodide ; Photochemistry ; Crystal structure ; Inorganic chemistry ; Catalysis ; Organic chemistry Polyoxometalates: Synthesis and Applications ; Nanocluster Synthesis and Applications ; Metal-Organic Frameworks: Synthesis and Applications