jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Reza Rahmati | Meysam Salari | Mehran Ashouri‐Sanjani | Amirmehdi Salehi | Mahdi Hamidinejad | Chul B. Park
Source: Small (article, 2023-12-17)
Field: Materials Science — Materials Chemistry

Comparative Effects of Hydrazine and Thermal Reduction Methods on Electromagnetic Interference Shielding Characteristics in Foamed Titanium Carbonitride MXene Films The urgent need for the development of micro-thin shields against electromagnetic interference (EMI) has sparked interest in MXene materials owing to their metallic electrical conductivity and ease of film processing. Meanwhile, postprocessing treatments can potentially exert profound impacts on their shielding effectiveness (SE). This work comprehensively compares two reduction methods, hydrazine versus thermal, to fabricate foamed titanium carbonitride (Ti<sub>3</sub>CNT<sub>x</sub>) MXene films for efficient EMI shielding. Upon treatment of ≈ 100 µm-thick MXene films, gaseous transformations of oxygen-containing surface groups induce highly porous structures (up to ≈ 74.0% porosity). The controlled application of hydrazine and heat allows precise regulation of the reduction processes, enabling tailored control over the morphology, thickness, chemistry, and electrical properties of the MXene films. Accordingly, the EMI SE values are theoretically and experimentally determined. The treated MXene films exhibit significantly enhanced SE values compared to the pristine MXene film (≈ 52.2 dB), with ≈ 38% and ≈ 83% maximum improvements for the hydrazine and heat-treated samples, respectively. Particularly, heat treatment is more effective in terms of this enhancement such that an SE of 118.4 dB is achieved at 14.3 GHz, unprecedented for synthetic materials. Overall, the findings of this work hold significant practical implications for advancing high-performance, non-metallic EMI shielding materials. Materials science ; Electromagnetic shielding ; Electromagnetic interference ; EMI ; Hydrazine (antidepressant) ; Titanium ; Shields ; Reduction (mathematics) ; Interference (communication) ; Thermal conductivity ; Composite material ; Thermal ; Metal ; Work (physics) ; Metallurgy ; Electronic engineering ; Mechanical engineering ; Computer science ; Telecommunications MXene and MAX Phase Materials ; Electromagnetic wave absorption materials ; Aluminum Alloys Composites Properties
Authors: Hamed Sharifi Dehsari | Morteza Hassanpour Amiri | Kamal Asadi
Source: ACS Nano (article, 2023-04-17)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Solution-Processed Multiferroic Thin-Films with Large Magnetoelectric Coupling at Room-Temperature Experimental realization of thin films with a significant room-temperature magnetoelectric coupling coefficient, <i>α</i><sub>ME</sub>, in the absence of an external DC magnetic field, has been thus far elusive. Here, a large coupling coefficient of 750 ± 30 mV Oe<sup>-1</sup> cm<sup>-1</sup> is reported for multiferroic polymer nanocomposites (MPCs) thin-films in the absence of an external DC magnetic field. The MPCs are based on PMMA-grafted cobalt-ferrite nanoparticles uniformly dispersed in the piezoelectric polymer poly(vinylidene fluoride-<i>co</i>-trifluoroethylene, P(VDF-TrFE). It is shown that nanoparticle agglomeration plays a detrimental role and significantly reduces <i>α</i><sub>ME</sub>. Surface functionalization of the nanoparticles by grafting a layer of poly(methyl methacrylate) (PMMA) <i>via</i> atom transfer radical polymerization (ATRP) renders the nanoparticle miscible with P(VDF-TRFE) matrix, thus enabling their uniform dispersion in the matrix even in submicrometer thin films. Uniform dispersion yields maximized interfacial interactions between the ferromagnetic nanoparticles and the piezoelectric polymer matrix leading to the experimental demonstration of large <i>α</i><sub>ME</sub> values in solution-processed thin films, which can be exploited in flexible and printable multiferroic electronic devices for sensing and memory applications. Multiferroics ; Materials science ; Thin film ; Coupling (piping) ; Condensed matter physics ; Nanotechnology ; Optoelectronics ; Ferroelectricity ; Dielectric ; Composite material ; Physics Multiferroics and related materials ; Ferroelectric and Piezoelectric Materials ; Magnetic and transport properties of perovskites and related materials
Authors: Sonali Das | Uzma Anjum | Kang Hui Lim | Qian He | Adam S. Hoffman | Simon R. Bare | Sergey M. Kozlov | Bruce C. Gates | Sibudjing Kawi
Source: Small (article, 2023-03-21)
Field: Materials Science — Materials Chemistry

Genesis of Active Pt/CeO<sub>2</sub> Catalyst for Dry Reforming of Methane by Reduction and Aggregation of Isolated Platinum Atoms into Clusters Atomically dispersed metal catalysts offer the advantages of efficient metal utilization and high selectivities for reactions of technological importance. Such catalysts have been suggested to be strong candidates for dry reforming of methane (DRM), offering prospects of high selectivity for synthesis gas without coke formation, which requires ensembles of metal sites and is a challenge to overcome in DRM catalysis. However, investigations of the structures of isolated metal sites on metal oxide supports under DRM conditions are lacking, and the catalytically active sites remain undetermined. Data characterizing the DRM reaction-driven structural evolution of a cerium oxide-supported catalyst, initially incorporating atomically dispersed platinum, and the corresponding changes in catalyst performance are reported. X-ray absorption and infrared spectra show that the reduction and agglomeration of isolated cationic platinum atoms to form small platinum clusters/nanoparticles are necessary for DRM activity. Density functional theory calculations of the energy barriers for methane dissociation on atomically dispersed platinum and on platinum clusters support these observations. The results emphasize the need for in-operando experiments to assess the active sites in such catalysts. The inferences about the catalytically active species are suggested to pertain to a broad class of catalytic conversions involving the rate-limiting dissociation of light alkanes. Catalysis ; Platinum ; Dissociation (chemistry) ; Methane ; Oxide ; Metal ; Carbon dioxide reforming ; Materials science ; Inorganic chemistry ; Chemical engineering ; Chemistry ; Syngas ; Physical chemistry ; Organic chemistry Catalytic Processes in Materials Science ; Catalysis and Oxidation Reactions ; Catalysts for Methane Reforming
Authors: Amanda Kessler | Ping Huang | Eva Blomberg | Inger Odnevall Wallinder
Source: Chemical Research in Toxicology (article, 2023-11-10)
Field: Materials Science — Materials Chemistry

Unravelling the Mechanistic Understanding of Metal Nanoparticle-Induced Reactive Oxygen Species Formation: Insights from a Cu Nanoparticle Study Humans can be exposed to engineered and nonintentionally formed metal and metal oxide nanoparticles (Me NPs) in occupational settings, in public transportation areas, or by means of contact with different consumer products. A critical factor in the toxic potency of Me NPs is their ability to induce oxidative stress. It is thus essential to assess the potential reactive oxygen species (ROS) formation properties of Me NPs. A common way to assess the relative extent of ROS formation <i>in vitro</i> is to use fluorescence spectroscopy with the DCFH-DA (2',7'-dichlorofluorescein diacetate) probe, with and without HRP (horseradish peroxidase). However, this method does not provide any information about specific ROS species or reaction mechanisms. This study investigated the possibility of using complementary techniques to obtain more specific information about formed ROS species, both the type and reaction mechanisms. Cu NPs in PBS (phosphate buffered saline) were chosen as a test system to have the simplest (least interference from other components) aqueous solution with a physiologically relevant pH. ROS formation was assessed using fluorescence by means of the DCFH-DA method (information on relative amounts of oxygen radicals without selectivity), the Ghormley's triiodide method using UV-vis spectrophotometry (concentrations of H<sub>2</sub>O<sub>2</sub>), and electron paramagnetic resonance with DMPO as the spin-trap agent (information on specific oxygen radicals). This approach elucidates that Cu NPs undergo ROS-generating corrosion reactions, which previously have not been assessed <i>in situ</i>. In the presence of H<sub>2</sub>O<sub>2</sub>, and based on the type of oxygen radical formed, it was concluded that released copper participates in Haber-Weiss and/or Fenton reactions rather than in Fenton-like reactions. The new combination of techniques used to determine ROS induced by Me NPs provides a way forward to gain a mechanistic understanding of Me NP-induced ROS formation, which is important for gaining crucial insight into their ability to induce oxidative stress. Reactive oxygen species ; Chemistry ; Radical ; Nanoparticle ; Hydrogen peroxide ; Photochemistry ; Oxygen ; Metal ; Horseradish peroxidase ; Oxidative stress ; Electron paramagnetic resonance ; Nuclear chemistry ; Organic chemistry ; Nanotechnology ; Biochemistry Nanoparticles: synthesis and applications ; Electrochemical Analysis and Applications ; Advanced oxidation water treatment
Authors: Arthur Wieder | Julia Camut | Amandine Duparchy | Radhika Deshpande | Aidan Cowley | Eckhard Müller | Johannes de Boor
Source: Materials Today Energy (article, 2023-09-13)
Field: Materials Science — Materials Chemistry

High-performance tellurium-free thermoelectric module for moderate temperatures using α-MgAgSb/Mg2(Si,Sn) Thermoelectric effect ; Materials science ; Figure of merit ; Tellurium ; Thermoelectric materials ; Thermoelectric generator ; Optoelectronics ; Seebeck coefficient ; Characterization (materials science) ; Thermoelectric cooling ; Engineering physics ; Composite material ; Thermodynamics ; Nanotechnology ; Metallurgy ; Thermal conductivity Advanced Thermoelectric Materials and Devices ; Thermal Expansion and Ionic Conductivity ; Thermal properties of materials
Authors: Zahra Heidari | Parizad Ghanbarikondori | Elham Mortazavi Mamaghani | Ali Hheidari | Elham Saberian | Elaheh Mozaffari | Mohsen Alizadeh | Mohammad Allahyartorkaman
Source: Asian Pacific Journal of Cancer Prevention (article, 2023-09-01)
Field: Materials Science — Biomaterials

Characteristics and Cytotoxic Effects of Nano-Liposomal Paclitaxel on Gastric Cancer Cells These findings collectively advocate the potential of liposomal NPs as promising contenders for effective nano-drug application in propelling chemotherapy forward. Paclitaxel ; Cytotoxicity ; Liposome ; Zeta potential ; Drug delivery ; Pharmacology ; Drug ; Cancer cell ; Nanomedicine ; Cancer ; Chemotherapy ; Chemistry ; Medicine ; Nanoparticle ; In vitro ; Nanotechnology ; Surgery ; Materials science ; Internal medicine ; Biochemistry Nanoparticle-Based Drug Delivery ; Cancer Research and Treatment ; Advanced Drug Delivery Systems
Authors: Lili Zhao | Zhuoan Cai | Xiaoyang Wang | Wenbo Liao | Si-Min Huang | Lingyun Ye | Jilie Fang | Chunxing Wu | Hao Qiu | Lei Miao
Source: Journal of Advanced Ceramics (article, 2023-02-15)
Field: Materials Science — Polymers and Plastics

Constructed TiO <sub>2</sub>/WO <sub>3</sub> heterojunction with strengthened nano-trees structure for highly stable electrochromic energy storage device Tungsten trioxide (WO<sub>3</sub>) has been widely regarded as a prospective bifunctional material due to its electrochromic and pseudocapacitive properties, while still facing the dilemma of inadequate cycle stability and trapping-induced degradation. Here, inspired by the trees-strengthening approach, a unique titanium dioxide (TiO<sub>2</sub>) nanorod arrays strengthened WO<sub>3</sub> nano-trees (TWNTs) heterojunction was rationally designed and constructed. In sharp contrast to the transmittance modulation (Δ<i>T</i>) attenuation of primary WO<sub>3</sub> nano-trees during cycling, the TWNTs film showed not only excellent electrochromic performance but also fascinating cycle stability (77.35% retention of the initial Δ<i>T</i> after 10,000 cycles). Besides, the trapping-induced degradation could be easily rejuvenated by a potentiostatic de-trapping process. An electrochromic energy storage device (EESD) was further assembled based on the TWNTs film to deliver excellent Δ<i>T</i> (up to 79.5% at 633 nm), fast switching speed (<i>t</i><sub>c</sub>/<i>t</i><sub>b</sub> =1.9 s/14.8 s), extremely high coloration efficiency value (443.4 cm<sup>2</sup>·C<sup>−1</sup>), and long-term cycle stability (over 10,000 charge/discharge cycles). This innovative study provided in-depth insights into the electrochromism nature and a significant step in the realization of stable electrochromic-energy storage application, paving the way for multifunctional smart windows as well as next-generation optoelectronic devices. Electrochromism ; Materials science ; Tungsten trioxide ; Optoelectronics ; Heterojunction ; Nanotechnology ; Electrochromic devices ; Tungsten ; Electrode Transition Metal Oxide Nanomaterials ; ZnO doping and properties ; Conducting polymers and applications
Authors: Anthony Maho | Suraj Kumar Nayak | Florian Gillissen | Rudi Cloots | Aline Rougier
Source: Coatings (review, 2023-11-01)
Field: Materials Science — Polymers and Plastics

Film Deposition of Electrochromic Metal Oxides through Spray Coating: A Descriptive Review Electrochromism induces reversible changes of coloration in specific organic and inorganic materials through electrical charge/discharge reactions. When processed into thin films, electrochromic metal oxides can be integrated into glazing applications such as displays, rearview mirrors, goggles and, most notably, smart windows in energy-efficient buildings. Over the years, the use of spray coating as a liquid-based approach has been acknowledged for its cost-efficient, high-throughput samples production with a low volume consumption. It represents an interesting alternative to vacuum processes and to other wet methods, suitably responding to the current limitations of electrochromic thin films production by offering improved control over deposition parameters and capacities of up-scaling, together with lowered energetic and economic costs. The present review summarizes the main theoretical and practical aspects of spray coating, notably distinguishing room-temperature methodologies from pyrolysis-based, under heating protocols. The main families of functional electrochromic metal oxides are then screened and discussed, establishing how spray processing can challengingly lead to higher levels of optical contrast, commutation kinetics, coloration efficiency and cycling durability, and how low-toxic and environment-friendly precursors can be favored while sustaining large deposition areas. Electrochromism ; Glazing ; Materials science ; Electrochromic devices ; Deposition (geology) ; Thin film ; Coating ; Nanotechnology ; Electrode ; Process engineering ; Composite material ; Chemistry ; Engineering Transition Metal Oxide Nanomaterials ; Conducting polymers and applications ; Gas Sensing Nanomaterials and Sensors
Authors: Teodora Cvanić | Olja Šovljanski | Senka Popović | Tamara Erceg | Jelena Vulić | Jasna Čanadanović‐Brunet | Gordana Ćetković | Vanja Travičić
Source: Coatings (article, 2023-10-27)
Field: Materials Science — Biomaterials

Progress in Fruit and Vegetable Preservation: Plant-Based Nanoemulsion Coatings and Their Evolving Trends Innovative technologies in the food industry are focused on integrated approaches to improve the sustainability of the food system that cover the whole supply chain. Huge post-harvest losses of fruits and vegetables and the use of synthetic chemical preservatives for this purpose are a matter of grave concern for any country. High demands for safe and healthy food have contributed to maximizing efforts to investigate post-harvest technology. Since fruits and vegetables are extremely perishable foods, they require the best post-harvest methods to maintain their storage stability and increase shelf-life. A solution for this emerging problem was found in the application of nanoemulsion edible coatings, described as thin-layered edible coatings or films with the possibility to provide additional benefits such as antioxidant and antimicrobial properties. These coatings provide protection against moisture loss, respiration, gaseous exchange, microbial spoilage, etc., offering promising results to safeguard the physicochemical during the time of storage and transportation of fruits and vegetables. This review summarizes the newest studies of nanoemulsion coatings on fresh products, providing valuable information regarding preparation and application methods and applied polymers and bioactives. Moreover, it gives a detailed description of the influence of nanoemulsion coating application (shelf-life, weight loss, colour, etc.) on fresh fruits and vegetables during storage. Food spoilage ; Shelf life ; Food preservation ; Sustainability ; Preservative ; Environmental science ; Food science ; Business ; Biotechnology ; Chemistry ; Biology Nanocomposite Films for Food Packaging ; Postharvest Quality and Shelf Life Management ; Microencapsulation and Drying Processes
Authors: Jose Manuel Sojo Gordillo | Carolina Duque Sierra | Gerard Gadea | Jaime Segura‐Ruiz | Valentina Bonino | Marc Núñez | Juan Carlos Gonzalez‐Rosillo | Denise Estrada‐Wiese | Marc Salleras | Luis F. Fonseca | Àlex Morata | Albert Tarancón
Source: Small (article, 2023-01-31)
Field: Materials Science — Materials Chemistry

Superior Thermoelectric Performance of SiGe Nanowires Epitaxially Integrated into Thermal Micro‐Harvesters Semiconductor nanowires have demonstrated fascinating properties with applications in a wide range of fields, including energy and information technologies. Particularly, increasing attention has focused on SiGe nanowires for applications in a thermoelectric generation. In this work, a bottom-up vapour-liquid-solid chemical vapour Deposition methodology is employed to integrate heavily boron-doped SiGe nanowires on thermoelectric generators. Thermoelectrical properties -, i.e., electrical and thermal conductivities and Seebeck coefficient - of grown nanowires are fully characterized at temperatures ranging from 300 to 600 K, allowing the complete determination of the Figure-of-merit, zT, with obtained values of 0.4 at 600 K for optimally doped nanowires. A correlation between doping level, thermoelectric performance, and elemental distribution is established employing advanced elemental mapping (synchrotron-based nano-X-ray fluorescence). Moreover, the operation of p-doped SiGe NWs integrated into silicon micromachined thermoelectrical generators is shown over standalone and series- and parallel-connected arrays. Maximum open circuit voltage of 13.8 mV and power output as high as 15.6 µW cm<sup>-2</sup> are reached in series and parallel configurations, respectively, operating upon thermal gradients generated with hot sources at 200 °C and air flows of 1.5 m s<sup>-1</sup> . These results pave the way for direct application of SiGe nanowire-based micro-thermoelectric generators in the field of the Internet of Things. Materials science ; Nanowire ; Thermoelectric effect ; Epitaxy ; Optoelectronics ; Nanotechnology ; Thermal ; Thermoelectric materials ; Engineering physics ; Thermal conductivity ; Composite material Advanced Thermoelectric Materials and Devices ; Nanowire Synthesis and Applications ; Thermal properties of materials
Authors: Tadeáš Hanuš | Bouraoui Ilahi | Alexandre Chapotot | Hubert Pelletier | Jinyoun Cho | Kristof Dessein | Abderraouf Boucherif
Source: Materials Today Advances (article, 2023-04-28)
Field: Materials Science — Materials Chemistry

Wafer-scale Ge freestanding membranes for lightweight and flexible optoelectronics Semiconductor-based freestanding membranes (FSM) have recently emerged as a highly promising area of advanced materials research. Their unique properties, such as lightweight and flexibility, make them attractive for a wide range of disruptive device applications. However, the production of high-quality, single-crystalline FSM, especially from elemental materials such as germanium (Ge), remains a significant challenge. In this work, we report on the formation of easily detachable wafer-scale Ge FSM on porous Ge (PGe) substrate. The proposed method relies on low-temperature Ge epitaxy, allowing to preserve the porous structure's integrity during the FSM formation, and an easy substrate preparation for multiple reuses. Analysis of the surface morphology as a function of the deposited Ge thickness reveals that the FSM formation occurs in two distinct regimes. During the initial epitaxial regime, the Ge growth is governed by 3D nucleation on the PGe top surface. The nanoscale islands size increase, and consequent coalescence are found to increase the surface roughness up to a critical thickness, allowing full coalescence of islands into a 2D epilayer. The analysis of the membrane's surface morphology for various thicknesses shows continuous improvement, achieving sub nanometer surface roughness. Moreover, we demonstrate that the FSM formation process is applicable regardless the PGe porosity and thickness, while offering facile and sustainable substrate reconditioning for multiple FSM generation from the same substrate. Our findings open new opportunities to produce lightweight and flexible, high-performance optoelectronics based on Ge FSM, while ensuring reduction of both cost and critical materials consumption. Materials science ; Wafer ; Epitaxy ; Surface roughness ; Nucleation ; Coalescence (physics) ; Substrate (aquarium) ; Nanotechnology ; Surface finish ; Nanoscopic scale ; Optoelectronics ; Porosity ; Composite material ; Layer (electronics) ; Chemistry Silicon Nanostructures and Photoluminescence ; Nanowire Synthesis and Applications ; Semiconductor materials and devices
Authors: Simone Di Noja | Marina Garrido | Lorenzo Gualandi | Giulio Ragazzon
Source: Chemistry - A European Journal (article, 2023-02-16)
Field: Chemistry — Organic Chemistry

Control over Dethreading Kinetics Allows Evaluating the Entropy Stored in an Interlocked Molecular Machine Out‐of‐Equilibrium** The operation of nanomachines is fundamentally different from that of their macroscopic counterparts. In particular, the role of solvent is critical yet rarely associated with machine functionality. Here, we study a minimal model of one of the most advanced molecular machines to gain control of its operation by engineering components and the employed solvent. Operation kinetics were changed over more than four orders of magnitude and could be modulated by solvent. Leveraging solvent properties, it was possible to monitor the relaxation of the molecular machine towards equilibrium and measure the heat exchanged in the process. Our work expands the capabilities of acid-base powered molecular machines, confirming experimentally that such systems have a dominant entropy content. Molecular machine ; Solvent ; Kinetics ; Entropy (arrow of time) ; Computer science ; Thermodynamics ; Work (physics) ; Materials science ; Process engineering ; Biological system ; Chemistry ; Nanotechnology ; Physics ; Engineering ; Organic chemistry Supramolecular Chemistry and Complexes ; Photoreceptor and optogenetics research ; Supramolecular Self-Assembly in Materials