jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Xincheng Zhuang | Haomiao Zhu | Fang Wang | Xiao Hu
Source: Ultrasonics Sonochemistry (article, 2024-08-08)
Field: Materials Science — Biomaterials

Revolutionizing wild silk fibers: Ultrasound enhances structure, properties, and regenerability of protein biomaterials in ionic liquids Ultrasound-assisted regulation of biomaterial properties has attracted increasing attention due to the unique reaction conditions induced by ultrasound cavitation. In this study, we explored the fabrication of wild tussah silk nanofiber membranes via ultrasound spray spinning from an ionic liquid system, characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), atomic force microscopy (AFM), water contact angle, cytocompatibility tests, and enzymatic degradation studies. We investigated the effects of ultrasound propagation in an ionic liquid on the morphology, structure, thermal and mechanical properties, surface hydrophilicity, biocompatibility, and biodegradability of the fabricated fibers. The results showed that as ultrasound treatment time increased from 0 to 60 min, the regenerated silk fiber diameter decreased by 0.97 μm and surface area increased by 30.44 μm<sup>2</sup>, enhancing the fiber surface smoothness and uniformity. Ultrasound also promoted the rearrangement of protein molecular chains and transformation of disordered protein structures into β-sheets, increasing the β-sheet content to 54.32 %, which significantly improved the materials' thermal stability (with decomposition temperatures rising to 256.38 °C) and mechanical properties (elastic modulus reaching 0.75 GPa). In addition, hydrophilicity, cytocompatibility, and biodegradability of the fiber membranes all improved with longer ultrasound exposure, highlighting the potential of ultrasound technology in advancing the properties of natural biopolymers for applications in sustainable materials science and tissue regeneration. Thermogravimetric analysis ; Ionic liquid ; Differential scanning calorimetry ; Materials science ; Biocompatibility ; Fourier transform infrared spectroscopy ; Contact angle ; Biomaterial ; Chemical engineering ; Scanning electron microscope ; SILK ; Chemistry ; Composite material ; Nanotechnology ; Organic chemistry Silk-based biomaterials and applications ; Electrospun Nanofibers in Biomedical Applications ; Dyeing and Modifying Textile Fibers
Authors: T. de Ara | Chunwei Hsu | A. Martinez-Garcia | Bianca C. Baciu | Pawel J. Bronk | Luca Ornago | Stefan van der Poel | E. B. Lombardi | Albert Guijarro | Carlos Sabater | Carlos Untiedt | Herre S. J. van der Zant
Source: The Journal of Physical Chemistry Letters (article, 2024-08-07)
Field: Materials Science — Materials Chemistry

Evidence of an Off-Resonant Electronic Transport Mechanism in Helicenes Helical molecules have been proposed as candidates for producing spin-polarized currents, even at room conditions, due to their chiral asymmetry. However, describing their transport mechanism in single molecular junctions is not straightforward. In this work, we show the synthesis of two novel kinds of dithia[11]helicenes to study their electronic transport in break junctions among a series of three helical molecules: dithia[<i>n</i>]helicenes, with <i>n</i> = 7, 9, and 11 molecular units. Our experimental measurements and clustering-based analysis demonstrate low conductance values that remain similar across different applied voltages and molecules. Additionally, we assess the length dependence of the conductance for each helicene, revealing an exponential decay characteristic of off-resonant transport. This behavior is primarily attributed to the misalignment between the energy levels of the molecule-electrodes system. The length dependence trend described above is supported by <i>ab initio</i> calculations, further confirming an off-resonant transport mechanism. Asymmetry ; Molecule ; Mechanism (biology) ; Chemical physics ; Series (stratigraphy) ; Work (physics) ; Spin (aerodynamics) ; Materials science ; Chemistry ; Molecular physics ; Nanotechnology ; Physics ; Quantum mechanics ; Thermodynamics Graphene research and applications ; Molecular Junctions and Nanostructures ; Synthesis and Properties of Aromatic Compounds
Authors: Roberta Capuano | Roberto Avolio | Rachele Castaldo | Mariacristina Cocca | Gennaro Gentile | Teresa Cirillo | Agata Nolasco | Maria Emanuela Errico
Source: Journal of Cleaner Production (article, 2024-07-01)
Field: Materials Science — Biomaterials

Up-cycling coffee silverskin into biobased functional coatings In this work, a novel route for the up-cycling of coffee silverskin (CS) based on a sustainable mechano-chemical process has been developed. CS was treated in a planetary ball milling in presence of water and the resulting suspension was used to realize thin bio-coatings deposited onto flexible packaging polylactic acid (PLA) films. CS based coatings exhibit homogeneous morphology, excellent adhesion on PLA substrates and good flexibility. The coatings display UV blocking properties, reducing the UV transmittance of PLA in the range 200–400 nm to values as low as 0.34%–2.67%, depending on the coating thickness and the process conditions. Moreover, a significant improvement of the oxygen barrier has been also recorded; CS coated films show an O2 transmission rate reduction up to 91% at 25 °C and 50% relative humidity with respect to PLA. Cycling ; Biochemical engineering ; Chemistry ; Engineering ; Geography ; Forestry Nanocomposite Films for Food Packaging ; Nanoparticles: synthesis and applications ; Nanomaterials and Printing Technologies
Authors: Filipe Pereira | Helena Lopes | Leandro Pinto | Filomena Soares | Rosa Vasconcelos | José Machado | Vı́tor Carvalho
Source: Applied Sciences (article, 2024-12-27)
Field: Materials Science — Polymers and Plastics

A Novel Deep Learning Approach for Yarn Hairiness Characterization Using an Improved YOLOv5 Algorithm In textile manufacturing, ensuring high-quality yarn is crucial, as it directly influences the overall quality of the end product. However, imperfections like protruding and loop fibers, known as ‘hairiness’, can significantly impact yarn quality, leading to defects in the final fabrics. Controlling yarn quality in the spinning process is essential, but current commercial equipment is expensive and limited to analyzing only a few parameters. The advent of artificial intelligence (AI) offers a promising solution to this challenge. By utilizing deep learning algorithms, a model can detect various yarn irregularities, including thick places, thin places, and neps, while characterizing hairiness by distinguishing between loop and protruding fibers in digital yarn images. This paper proposes a novel approach using deep learning, specifically, an enhanced algorithm based on YOLOv5s6, to characterize different types of yarn hairiness. Key performance indicators include precision, recall, F1-score, mAP0.5:0.95, and mAP0.5. The experimental results show significant improvements, with the proposed algorithm increasing model mAP0.5 by 5% to 6% and mAP0.5:0.95 by 11% to 12% compared to the standard YOLOv5s6 model. A 10k-fold cross-validation method is applied, providing an accurate estimate of the performance on unseen data and facilitating unbiased comparisons with other approaches. Yarn ; Algorithm ; Artificial intelligence ; Computer science ; Characterization (materials science) ; Materials science ; Nanotechnology ; Composite material Textile materials and evaluations ; Industrial Vision Systems and Defect Detection
Authors: A. D. Kondorskiy
Source: Chinese Optics Letters (article, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Optical spectra of plasmon–exciton core–shell nanoparticles: an anisotropic classical model eliminates discrepancies in experiments The optical properties of hybrid core-shell nanostructures composed of a metallic core and an organic shell of molecular J-aggregates are determined by the electromagnetic coupling between plasmons localized at the surface of the metallic core and Frenkel excitons in the shell.In cases of strong and ultra-strong plasmon-exciton coupling, the use of the traditional isotropic classical oscillator model to describe the J-aggregate permittivity may lead to drastic discrepancies between theoretical predictions and the available experimental spectra of hybrid nanoparticles.We show that these discrepancies are not caused by limitations of the classical oscillator model itself, but by considering the organic shell as an optically isotropic material.By assuming a tangential orientation of the classical oscillators of the molecular J-aggregates in a shell, we obtain excellent agreement with the experimental extinction spectra of TDBC-coated gold nanorods, which cannot be treated with the conventional isotropic shell model.Our results extend the understanding of the physical effects in the optics of metal-organic nanoparticles and suggest an approach for the theoretical description of such hybrid systems. Optics ; Plasmon ; Exciton ; Materials science ; Anisotropy ; Spectral line ; Core (optical fiber) ; Nanoparticle ; Shell (structure) ; Nonlinear optics ; Surface plasmon ; Physics ; Molecular physics ; Condensed matter physics ; Nanotechnology ; Laser ; Quantum mechanics Gold and Silver Nanoparticles Synthesis and Applications ; Plasmonic and Surface Plasmon Research ; Nonlinear Optical Materials Studies
Authors: Nada N. Al-Refaey | A. Abd El-Maboud | A. Abdelghany | I. Kashif
Source: Journal of Materials Science Materials in Electronics (article, 2024-09-01)
Field: Materials Science — Ceramics and Composites

Effect of samarium oxide addition on the structural, thermal, and optical properties and photoluminescence of lithium borate glass Abstract The samples were prepared in compliance with the form 33 Li 2 O–66 B 2 O 3 —(1-x) AgF—x Sm 2 O 3 , where x = 0, 0.25, 0.5, and 0.75. Powdered samples were converted to a glassy state via melting and quenching. The glassiness of the prepared samples was examined using X-ray diffraction (XRD) and Differential Thermal Analysis (DTA). From the absorption spectra of the prepared glass samples, the band gap in the optical spectrum changed slightly in the range of 3.45, whereas the Urbach energy decreased from 0.32 to 0.267 eV. The fluctuations of the optical band gap and Urbach energy can be attributed to variations in the glass structure. Sm3 + emitted intense reddish-orange light under blue and UV light excitation. There are six excitation bands in the Sm 3+ excitation spectrum situated in the blue and UV regions, peaking at 361.7, 374, 400, 417, 462, and 475 nm, which are attributed to the transitions from 6 H 5/2 to 4 D 3/2 , 6 P 7/2 , 6 P 3/2 , 6 P 5/2 , 4 I 13/2 , and 4 I 11/2 respectively. The transition from 6 H 5/2 to 6 P 3/2 had the highest intensity and was associated with a peak at 400 nm. The bright yellow, reddish-orange, and red emission bands of the Sm 3+ ions in the oxide glasses are related to the 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 , and 4 G 5/2 → 6 H 9/2 emission transitions, respectively. Materials science ; Photoluminescence ; Samarium ; Lithium borate ; Lithium (medication) ; Boron ; Thermal ; Oxide ; Inorganic chemistry ; Borate glass ; Boron oxide ; Chemical engineering ; Metallurgy ; Optoelectronics ; Doping ; Thermodynamics ; Organic chemistry Glass properties and applications ; Luminescence Properties of Advanced Materials ; Photorefractive and Nonlinear Optics
Authors: Vahid Momeni | Sorana Luca | Joamin González-Gutiérrez | Santiago Cano | Emilie Sueur | Zahra Shahroodi | Stephan Schuschnigg | Christian Kukla | Clemens Holzer
Source: Applied Sciences (article, 2024-06-28)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Binder System Composition on the Rheological and Magnetic Properties of Nd-Fe-B Feedstocks for Metal Injection Molding The applications of Nd-Fe-B-based magnets are experiencing significant diversification to achieve efficiency and miniaturization in different technologies. Metal injection molding (MIM) provides new opportunities to manufacture Nd-Fe-B magnets with high geometrical complexity efficiently. In this study, the impacts of the binder system composition and powder loading on the rheological behavior, contamination, and magnetic properties of the Nd-Fe-B MIM parts were investigated. A high-pressure capillary rheometer was used to measure the apparent viscosity and pressure drops for feedstocks with different binder formulations and powder contents. Also, oxygen and carbon contamination, density, and magnetic properties were measured for different feedstock formulations and powder loadings. From the rheological, density, and magnetic properties points of view, the binder system consisting of 45 vol.% LLDPE as backbone was selected as the optimum formulation. The findings indicated that the sample with this binder system and 55 vol.% powder content had a high density (6.83 g/cm3), remanence (0.591 T), and coercivity (744.6 kA/m) compared to other binder compositions. By using 58 vol.% powder loading, the values of density (7.54 g/cm3), remanence (0.618 T), and carbon residue (982 ppm) improved, and a suitable rheological behavior was still observed. Thus, a suitable feedstock formulation was developed. Rheology ; Materials science ; Molding (decorative) ; Composite material ; Composition (language) ; Metal injection molding ; Metallurgy Magnetic Properties of Alloys ; Powder Metallurgy Techniques and Materials ; Metallurgical and Alloy Processes
Authors: Xin Sun | Huiwen Tian | Fangxin Zou | W. Li | Yujie Qiang | Baorong Hou
Source: Materials (article, 2024-07-30)
Field: Materials Science — Materials Chemistry

Turning Waste into Treasure: Invasive Plant Ambrosia trifida L Leaves as a High-Efficiency Inhibitor for Steel in Simulated Pickling Solutions High toxicity is the main reason for the limited application of traditional corrosion inhibitors. Herein, it is critical to find a green, efficient, and long-term stable alternative substitute for the hazardous and conventional corrosion inhibitor. <i>Ambrosia trifida L</i> is widely distributed in fields and riverside wetlands as an invasive plant in China. According to the concept of turning waste into treasure, the extract of <i>Ambrosia trifida L</i> leaves (ATL) has the potential to address this issue due to its natural origin and abundant presence of heterocyclic organics. Therefore, ATL, as a green corrosion inhibitor, is prepared for the first time via a simple water-based extraction method. FT-IR (Fourier transform infrared spectroscopy) and UV-Vis (UV-visible) indicate that ATL extract contains abundant heterocyclic organics with conjugated structures, which exhibit the potential to become a high-efficiency inhibitor. Notably, the active sites of ATL molecules and their interaction with Q235 steel at the molecular/atomic level are revealed via theoretical calculations. The highest <i>E</i><sub>binding</sub> value observed for the major components in the ATL extract is 259.66 kcal/mol, implying a significant adsorption capacity. The electrochemical results verify that microdose ATL extract can prominently inhibit steel corrosion, and the highest inhibition efficiency (<i>η</i>) is 97.5% (1000 mg/L). Following immersion for 24 h, the <i>η</i> value is enhanced to 99.0%, indicating a reliable and long-term ATL extract protection film is formed on the steel surface in harsh acidic solutions. The results of the weight loss, SEM (scanning electron microscope), and LSCM (laser scanning confocal microscopy) are consistent with the above conclusions. Finally, this study anticipates providing theoretical support for developing novel green plant extract inhibitors and aiding in their application in industrial pickling environments. Pickling ; Corrosion ; Corrosion inhibitor ; Hazardous waste ; Materials science ; Pulp and paper industry ; Metallurgy ; Waste management ; Environmental science ; Engineering Corrosion Behavior and Inhibition ; Concrete Corrosion and Durability ; Lignin and Wood Chemistry
Authors: Aamir Mahmood | Miroslava Pechočiaková | Muhammad Tayyab Noman | Stanisław Wacławek | Mohammad Gheibi | Kourosh Behzadian | Jakub Wiener | Jiřı́ Militký
Source: Journal of Building Engineering (article, 2024-05-20)
Field: Materials Science — Polymers and Plastics

Aging behaviour assessment of cellulosic fibres in alkaline media: A green technology approach in construction materials With the increasing demand for buildings, the utilisation of green materials represents a novel approach toward achieving sustainable development goals. Cellulose-based materials, such as jute, exemplify eco-friendly substances for civil engineering applications. The present study aims at studying the aging behavior of jute fibers in an alkaline environment. For this purpose, three alkali environments (NaOH, KOH, Ca(OH)2) with three different concentrations were selected. Samples were treated at three different periods (7d, 14d, and 28d) to assess the impact of treatment on the fiber properties. This study introduces a pioneering concept of the alkali treatment of jute-based fibres to evaluate tensile strength and weight loss, marking the first of its kind. This approach incorporates various characterisation techniques, including Differential Scanning Calorimetry (DSC), Thermo-Gravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM) to assess the treatment process. In our experimental procedures, we evaluated key parameters such as the type of alkali, alkali concentration, and curing time for their influence on tensile strength. Subsequently, we applied Response Surface Methodology (RSM) in conjunction with bagging techniques to develop mathematical models based on the acquired data. Results demonstrated varied tensile strengths based on alkali type, concentration, and treatment duration. Fibres treated with 15 g/L concentration of NaOH exhibited an increase in tensile strength from 7 days (79.66 MPa) to 28 days (225.05 MPa). The highest tensile strength of jute fibres treated with KOH was observed with 15 g/L concentration at 14 days (237.58 MPa). For Ca(OH)₂ treatments, the highest tensile strength was observed with 30 g/L concentration at 14 days (111.28 MPa). It was also observed that prolonged exposure to very high alkali concentrations could adversely affect the tensile strength, as observed in the case of 30 g/L concentration of NaOH at 28 days (84.73 MPa). Among the various alkali materials tested, NaOH and KOH demonstrated greater effectiveness compared to Ca(OH)2. According to RSM analysis, the time of sample curing was found to be the most significant factor in tensile strength, with a P-value of 0.009. On average, the tensile strength changes by 54%, 52%, and 35% for NaOH, KOH, and Ca(OH)₂, respectively, when the curing time shifts from 7 days to 28 days. Ultimate tensile strength ; Curing (chemistry) ; Materials science ; Cellulose fiber ; Differential scanning calorimetry ; Alkali metal ; Composite material ; Scanning electron microscope ; Thermogravimetric analysis ; Cellulose ; Gravimetric analysis ; Fiber ; Chemistry Natural Fiber Reinforced Composites ; Advanced Cellulose Research Studies ; Bamboo properties and applications
Authors: Mamadou Souare | Changqing Dong | Tong Xing | Junjiao Zhang | Xiaoying Hu
Source: Membranes (article, 2024-11-18)
Field: Materials Science — Surfaces, Coatings and Films

Efficient Separation of Oil/Water by a Biodegradable and Superhydrophobic Composite Based on Loofah and Rice Straw Membrane filtration is one of the preferred choices for petroleum wastewater disposal due to its simplicity and low energy consumption. In this paper, a biodegradable superhydrophobic membrane based on loofah and rice straw (LF-RS) was prepared and modified with dodecyltriethoxysilane to improve its stability, morphology, and performance. The membrane showed an efficiency of 99.06% for oil/water separation with an average water flux of 2057.37 Lm<sup>-2</sup>h<sup>-1</sup> and a tensile strength of 11.19 MPa. The tensile strength of the LF-RS membrane was 322.47% higher than that of the PVDF membrane and 126.58% higher than that of the commercially available nitrocellulose membrane. Through molecular simulations, we showed a 96.3% reduction in interaction energy between water and membrane post-modification, which is beneficial for increasing the contact angle and separation performance. This study provides an option for the large-scale, cost-effective fabrication of eco-friendly membranes for pollutant removal. Composite number ; Rice straw ; Straw ; Separation (statistics) ; Pulp and paper industry ; Materials science ; Composite material ; Environmental science ; Agronomy ; Mathematics ; Engineering ; Biology Surface Modification and Superhydrophobicity ; Advanced Cellulose Research Studies ; Pickering emulsions and particle stabilization
Authors: Jidong Liu | Haibo Gan | Qiaoyan Hao | Yonghong Zeng | Youning Gong | Jiaqi Zhu | Jiarui Huang | Liu Fei | Wenjing Zhang
Source: InfoMat (article, 2024-10-02)
Field: Materials Science — Materials Chemistry

High‐performance visible and near‐infrared dual‐band photodetector based on anisotropic <scp>2D NbS<sub>3</sub></scp> with perpendicularly reversed polarization behaviors Abstract Dual‐band photodetectors exhibit considerable advantages in target discrimination and navigation compared to single‐band devices in complex circumstances. However, it remains a major challenge to overcome the limitations of traditional devices in terms of their integration with multiple light‐absorbing layers and complicated optical components. In this study, a visible and near‐infrared (NIR) dual‐band polarimetric photodetector with a single light‐absorbing layer is constructed by utilizing the distinctive conversion of linear dichroism (LD) polarity in two‐dimensional niobium trisulfide (NbS 3 ). The NbS 3 photodetector exhibits selective detection behaviors in the visible and NIR bands, in which by switching the polarization angle of the incident light from 0° to 90°, photocurrent decreases in the visible region, and increases in the NIR region. Specifically, the degrees of linear polarization of photocurrent are 0.59 at 450 nm and −0.47 at 1300 nm, respectively. The opposite photoresponse in the visible and NIR bands of the photodetector significantly enhances the dual‐band information recognition. Therefore, clear visible and NIR dual‐band polarimetric imaging is accurately realized based on the NbS 3 photodetector taking advantage of its fast response speed of 28 μs. Such anisotropic materials, with unique LD conversion features, can facilitate selective modulation between the visible and NIR spectral ranges and promote the development of next‐generation multi‐dimensional photodetection for various applications, including com/puter vision, surveillance, and biomedical imaging. image Photodetector ; Perpendicular ; Anisotropy ; Infrared ; Polarization (electrochemistry) ; Materials science ; Optoelectronics ; Multi-band device ; Optics ; Chemistry ; Telecommunications ; Physics ; Computer science 2D Materials and Applications ; Advanced Semiconductor Detectors and Materials ; Gas Sensing Nanomaterials and Sensors