jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Gazi A. K. M. Rafiqul Bari | Mobinul Islam | Jae-Ho Jeong
Source: Metals (article, 2024-04-03)
Field: Materials Science — Materials Chemistry

Materials Design and Development of Photocatalytic NOx Removal Technology Nitrogen oxide (NOx) pollutants have a significant impact on both the environment and human health. Photocatalytic NOx removal offers a sustainable and eco-friendly approach to combatting these pollutants by harnessing renewable solar energy. Photocatalysis demonstrates remarkable efficiency in removing NOx at sub-scale levels of parts per billion (ppb). The effectiveness of these catalysts depends on various factors, including solar light utilization efficiency, charge separation performance, reactive species adsorption, and catalytic reaction pathway selectivity. Moreover, achieving high stability and efficient photocatalytic activity necessitates a multifaceted materials design strategy. This strategy encompasses techniques such as ion doping, defects engineering, morphology control, heterojunction construction, and metal decoration on metal- or metal oxide-based photocatalysts. To optimize photocatalytic processes, adjustments to band structures, optimization of surface physiochemical states, and implementation of built-in electric field approaches are imperative. By addressing these challenges, researchers aim to develop efficient and stable photocatalysts, thus contributing to the advancement of environmentally friendly NOx removal technologies. This review highlights recent advancements in photocatalytic NOx removal, with a focus on materials design strategies, intrinsic properties, fundamental developmental aspects, and performance validation. This review also presents research gaps, emphasizing the need to understand the comprehensive mechanistic photocatalytic process, favored conditions for generating desired reactive species, the role of water concentration, temperature effects, inhibiting strategies for photocatalyst-deactivating species, and the formation of toxic NO2. NOx ; Photocatalysis ; Technology development ; Environmental science ; Waste management ; Process engineering ; Engineering ; Chemistry ; Manufacturing engineering Catalytic Processes in Materials Science ; Advanced Photocatalysis Techniques ; Gas Sensing Nanomaterials and Sensors
Authors: Myat Noe Khin | Shabbir Ahammed | Tariq Aziz | Fahad Al‐Asmari | Manal Y. Sameeh | Haiying Cui | Lin Lin
Source: Packaging Technology and Science (article, 2024-07-23)
Field: Materials Science — Biomaterials

Characterization of Composite Film Containing Polyvinyl Alcohol Cross‐Linked With Dialdehyde Cellulose Using Citric Acid as a Catalyst for Sustainable Packaging ABSTRACT This study is aimed at fabricating composite films by cross‐linking polyvinyl alcohol (PVA) and dialdehyde cellulose (DAC) in varying ratios using citric acid as a catalyst. The acetal formation between the two components was studied using FTIR. Characterizations of the physiochemical properties revealed that increasing the DAC ratio of the composite film improved the hydrophobicity, tensile strength and barrier properties (water vapour, UV and oxygen) of the films while reducing elongation at break (flexibility), swelling and solubility of the film in water. When the DAC ratio was elevated to 50%, the tensile strength was enhanced to 98 MPa. In comparison, flexibility diminished to 29%, the solubility of the film reduced to 10% and water vapour permeability was lower by two orders of magnitude than that of the control PVA film. The peroxide value of linoleic acid decreased from 21.2% ± 7.6 (packed with PVA film) to 9.9% ± 0.9 (packed with 50% DAC composite film) after 15 days. Furthermore, the composite films demonstrated effective absorption of UV radiation, with the order of effectiveness being UV‐C &gt; UV‐B &gt; UV‐A radiation. No significant difference in biodegradability was detected in the composite films with an increase in DAC ratio during indoor soil burial tests for 30 days. This study implies that the composite film could serve as an alternative sustainable packaging option, especially when transparency and high oxygen barrier properties are desired. Ultimate tensile strength ; Composite number ; Polyvinyl alcohol ; Materials science ; Citric acid ; Absorption of water ; Solubility ; Oxygen permeability ; Chemical engineering ; Cellulose ; Food packaging ; Nuclear chemistry ; Composite material ; Oxygen ; Chemistry ; Organic chemistry Nanocomposite Films for Food Packaging ; Advanced Cellulose Research Studies ; biodegradable polymer synthesis and properties
Authors: Noohul Alam | Anish Kumar Das | Priyanka Chandrashekar | P. R. Baidya | Sukhendu Mandal
Source: Nanoscale (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Recent progress in atomically precise silver nanocluster-assembled materials In the dynamic landscape of nanotechnology, atomically precise silver nanoclusters (Ag NCs) have emerged as a novel and promising category of materials with their fascinating properties and enormous potential. However, recent research endeavors have surged towards stabilizing Ag-based NCs, leading to innovative strategies like connecting cluster nodes with organic linkers to construct hierarchical structures, thus forming Ag-based cluster-assembled materials (CAMs). This approach not only enhances structural stability, but also unveils unprecedented opportunities for CAMs, overcoming the limitations of individual Ag NCs. In this context, this review delves into the captivating realm of atomically precise nitrogen-based ligand bonded Ag(I)-based CAMs, providing insights into synthetic strategies, structure-property relationships, and diverse applications. We navigate the challenges and advancements in integrating Ag(I) cluster nodes, bound by argentophilic interactions, into highly connected periodic frameworks with different dimensionalities using nitrogen-based linkers. Despite the inherent diversity among cluster nodes, Ag(I) CAMs demonstrate promising potential in sensing, catalysis, bio-imaging, and device fabrication, which all are discussed in this review. Therefore, gaining insight into the silver nanocluster assembly process will offer valuable information, which can enlighten the readers on the design and advancement of Ag(I) CAMs for state-of-the-art applications. Nanoclusters ; Nanotechnology ; Cluster (spacecraft) ; Context (archaeology) ; Materials science ; Polyoxometalate ; Computer science ; Chemistry ; Catalysis Nanocluster Synthesis and Applications ; Advanced Nanomaterials in Catalysis ; Gold and Silver Nanoparticles Synthesis and Applications
Authors: Jonathan Andrews | Russell G. Woodger | Christopher F. Palmer | Darren L. Poole | Michael C. Willis
Source: Angewandte Chemie International Edition (article, 2024-07-04)
Field: Chemistry — Organic Chemistry

Exploiting <i>trans</i>‐Sulfinylation for the Synthesis of Diverse <i>N</i>‐Alkyl Sulfinamides via Decarboxylative Sulfinamidation Combining simple amines with the bench-stable sulfinylamine Tr-NSO allows in situ preparation of reactive alkyl sulfinylamines, which when combined with alkyl radicals generated by photocatalytic decarboxylation, provides N-alkyl sulfinamides. The reactions are broad in scope and tolerate a wide variety of functional groups on both the acid and amine components. The sulfinamide products are used to prepare a selection of challenging S(VI) products. The method provides a convenient way to use reactive and unstable alkyl sulfinylamines. Alkyl ; Chemistry ; Stereochemistry ; Organic chemistry Sulfur-Based Synthesis Techniques ; Synthesis and Catalytic Reactions ; Catalytic C–H Functionalization Methods
Authors: James Lefley | Roberto Terracciano | Zivani Varanaraja | James Beament | C. Remzi Becer
Source: Macromolecules (article, 2024-06-06)
Field: Chemistry — Organic Chemistry

Self-Assembly Behavior of Amphiphilic Poly(2-ethyl-2-oxazoline)-<i>b</i>-poly(2-isostearyl-2-oxazoline) Block Copolymers By utilizing a unique hydrophobic 2-oxazoline monomer, we report the facile and efficient synthesis of a novel poly(2-ethyl-2-oxazoline)-block-poly(2-isostearyl-2-oxazoline) copolymer library via cationic ring-opening polymerization. Varying the hydrophilic–hydrophobic block ratios of the copolymers afforded good control over thermal properties such as the glass transition temperature, leading to an increase from 0 to 60 °C as the volume fraction of the 2-ethyl-2-oxazoline block increased. A solvent-free self-assembly method was employed to study the self-assembly behavior of the copolymer library. Thus, using thin film hydration, a wide range of self-assembled structures were obtained in aqueous solution. Structures such as micelles, short and long worms, and unilamellar and multilamellar vesicles were observed and characterized via dynamic light scattering and electron microscopy analysis. All structures exhibited excellent stability in solution at ambient temperatures over a 2 month period and showed thermoresponsive behavior. Copolymer ; Oxazoline ; Amphiphile ; Polymer chemistry ; Self-assembly ; Materials science ; Polymer science ; Chemistry ; Polymer ; Organic chemistry Advanced Polymer Synthesis and Characterization ; Surfactants and Colloidal Systems ; biodegradable polymer synthesis and properties
Authors: Ian W. Hamley | Anindyasundar Adak | Valeria Castelletto
Source: Nature Communications (article, 2024-08-08)
Field: Chemistry — Spectroscopy

Influence of chirality and sequence in lysine-rich lipopeptide biosurfactants and micellar model colloid systems Lipopeptides can self-assemble into diverse nanostructures which can be programmed to incorporate peptide sequences to achieve a remarkable range of bioactivities. Here, the influence of peptide sequence and chirality on micelle structure and interactions is investigated in a series of lipopeptides bearing two lysine or D-lysine residues and tyrosine or tryptophan residues, attached to a hexadecyl lipid chain. All molecules self-assemble into micelles above a critical micelle concentration (CMC). Small-angle x-ray scattering (SAXS) is used to probe micelle shape and structure from the form factor and to probe inter-micellar interactions via analysis of structure factor. The CMC is obtained consistently from surface tension and electrical conductivity measurements. We introduce a method to obtain the zeta potential from the SAXS structure factor which is in good agreement with directly measured values. Atomistic molecular dynamics simulations provide insights into molecular packing and conformation within the lipopeptide micelles which constitute model self-assembling colloidal systems and biomaterials. Chirality (physics) ; Lipopeptide ; Colloid ; Lysine ; Sequence (biology) ; Chemistry ; Micelle ; Chemical engineering ; Microbiology ; Biophysics ; Biochemistry ; Physics ; Biology ; Amino acid ; Organic chemistry ; Bacteria ; Chiral symmetry ; Aqueous solution ; Genetics Analytical Chemistry and Chromatography ; Porphyrin and Phthalocyanine Chemistry ; Supramolecular Chemistry and Complexes
Authors: Lorena Simó-Cabrera | Salvador García-Chumillas | Sergio J. Benitez-Benitez | Verónica Cánovas | Fuensanta Monzó | Carmen Pire | Rosa María Martínez‐Espinosa
Source: Bioengineering (article, 2024-08-27)
Field: Materials Science — Biomaterials

Production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) by Haloferax mediterranei Using Candy Industry Waste as Raw Materials The haloarchaeon <i>Haloferax mediterranei</i> synthesizes poly(3-hydroxybutyrate-<i>co</i>-3-hydroxyvalerate) (PHBV) under unfavorable nutritional conditions without the addition of any precursor to the culture, which is an advantage compared to other microbial counterparts able to synthesize polyhydroxyalkanoates (PHA). PHBV is a biodegradable polymer showing physiochemical properties of biotechnological and biomedical interest and can be used as an alternative to plastics made from chemical synthesis (which are not environmentally friendly). The versatile metabolism of <i>H. mediterranei</i> makes the use of waste as a carbon source for cellular growth and PHA synthesis possible. In this work, cellular growth and the production and characterization of PHBV using two different types of confectionery waste were analyzed and compared with cellular growth and PHBV synthesis in a standard culture media with glucose of analytical grade as a carbon source. The PHBV granules produced were analyzed by TEM and the biopolymer was isolated and characterized by GC-MS, FTIR NMR, and DSC. The results reveal that <i>H. mediterranei</i> can use these two residues (R1 and R2) for pure PHBV production, achieving 0.256 and 0.983 g PHBV/L, respectively, which are among the highest yields so far described using for the first-time waste from the candy industry. Thus, a circular economy-based process has been designed to optimize the upscaling of PHBV production by using haloarchaea as cell factories and valorizing confectionery waste. Raw material ; Pulp and paper industry ; Polyhydroxyalkanoates ; Production (economics) ; Waste management ; Business ; Materials science ; Chemistry ; Engineering ; Bacteria ; Biology ; Organic chemistry biodegradable polymer synthesis and properties ; Microplastics and Plastic Pollution ; Additive Manufacturing and 3D Printing Technologies
Authors: Beatriz Quevedo-Flores | Irene Bosque | José C. González‐Gómez
Source: Organic Letters (article, 2024-08-24)
Field: Chemistry — Organic Chemistry

Electrophotocatalytic Hydroxymethylation of Azaarenes with Methanol The merging of electrochemistry and photocatalysis allowed the required selectivity for the hydroxymethylation of functionalized azaarenes with methanol, including bioactive substrates. The two electrophotocatalytic protocols developed in this work address this transformation, using nontoxic and readily available reagents under mild reaction conditions with electricity as the only "sacrificial oxidant". Chemistry ; Methanol ; Reagent ; Photocatalysis ; Selectivity ; Combinatorial chemistry ; Electrochemistry ; Organic chemistry ; Catalysis Radical Photochemical Reactions ; Catalytic C–H Functionalization Methods ; Sulfur-Based Synthesis Techniques
Authors: J. Tyczkowski | Hanna Kierzkowska‐Pawlak
Source: ACS Applied Materials & Interfaces (review, 2024-07-11)
Field: Materials Science — Materials Chemistry

Classical Concept of Semiconductor Heterojunctions in the Approach to Nanohybrid Catalysts Recalling the well-established theory of heterojunction formation between two different semiconductors or a semiconductor and a metal can elucidate the remarkable catalytic properties of nanohybrid systems employed in thermal catalysis. Upon the creation of heterojunctions, involved nanoparticles or nanometer-sized thin films, as a result of their dimensions, may become entirely filled with space charges generated from the development of depletion or accumulation regions. This phenomenon dictates the nature of catalytic sites and consequently affects the catalytic activity of such nanohybrids. The following perspective presents this concept and examples of experimental results that substantiate its validity, along with an extremely effective tool, cold plasma deposition, for designing and realizing in a controlled manner the structure of nanohybrids with heterojunctions. This approach will undoubtedly broaden the view of the contemporary "alchemy" of nanocatalysts. Materials science ; Heterojunction ; Nanotechnology ; Catalysis ; Semiconductor ; Optoelectronics ; Organic chemistry Catalytic Processes in Materials Science ; Catalysis and Oxidation Reactions ; Machine Learning in Materials Science
Authors: Asmaa M. Elsayed | Ashour M. Ahmed | M. T. Tammam | M. F. Eissa | Arafa H. Aly
Source: Scientific Reports (article, 2024-01-10)
Field: Chemistry — Electrochemistry

Sensing of heavy metal Pb2+ ions in water utilizing the photonic structure of highly controlled hexagonal TiON/TiO2 nanotubes The detection of heavy metals in water, especially Pb<sup>2+</sup> ions, is important due to their severe hazardous effects. To address this issue, a highly controlled hexagonal TiON/TiO<sub>2</sub> heterostructure has been synthesized in this study. The fabrication process involved the utilization of atomic layer deposition and direct current sputtering techniques to deposit TiO<sub>2</sub> and TiON layers onto a porous Al<sub>2</sub>O<sub>3</sub> membrane used as a template. The resulting heterostructure exhibits a well-ordered hollow tube structure with a diameter of 345 nm and a length of 1.2 µm. The electrochemical sensing of Pb<sup>2+</sup> ions in water is carried out using a cyclic voltammetry technique under both light and dark conditions. The concentration range for the Pb<sup>2+</sup> ions ranges from 10<sup>-5</sup> to 10<sup>-1</sup> M. The sensitivity values obtained for the sensor are 1.0 × 10<sup>-6</sup> in dark conditions and 1.0 × 10<sup>-4</sup> in light conditions. The remarkable enhancement in sensitivity under light illumination can be attributed to the increased activity and electron transfer facilitated by the presence of light. The sensor demonstrates excellent reproducibility, highlighting its reliability and consistency. These findings suggest that the proposed sensor holds great promise for the detection of Pb<sup>2+</sup> ions in water, thereby facilitating environmental monitoring, water quality assessment, and safety regulation across various industries. Furthermore, the eco-friendly and straightforward preparation techniques employed in its fabrication provide a significant advantage for practical and scalable implementation. Materials science ; Heterojunction ; Metal ions in aqueous solution ; Fabrication ; Ion ; Nanotechnology ; Metal ; Chemical engineering ; Optoelectronics ; Chemistry Electrochemical Analysis and Applications ; Analytical Chemistry and Sensors ; Gas Sensing Nanomaterials and Sensors
Authors: Hoeun Seong | Dongil Lee
Source: Bulletin of the Korean Chemical Society (article, 2024-04-06)
Field: Materials Science — Materials Chemistry

Atomically precise metal nanoclusters for energy conversion Abstract Atomically precise metal nanoclusters (NCs) have emerged as a new frontier in electrocatalysis, enabling the study of electrocatalytic reactions on well‐defined stable surfaces and rational electrocatalyst design based on atomic‐level tailoring. In this review, we focus on the recent applications of these NCs to energy conversion reactions, including those involved in water splitting (hydrogen and oxygen evolution reactions), fuel cell operation (oxygen reduction and hydrogen oxidation reactions), and electrochemical CO 2 reduction. Emblematic examples are used to highlight the roles of different NC parts, for example, core metal and surrounding ligands, and the significance of the electrode substrate. Finally, we discuss the perspectives of the future development and implementation of NC‐based energy conversion systems. Nanoclusters ; Metal ; Nanotechnology ; Energy transformation ; Energy (signal processing) ; Materials science ; Physics ; Metallurgy Nanocluster Synthesis and Applications ; Gold and Silver Nanoparticles Synthesis and Applications ; Advanced Nanomaterials in Catalysis
Authors: Jingang Wang | Haibo Yu | Jianchen Zheng | Yuzhao Zhang | Hongji Guo | Ye Qiu | Xiaoduo Wang | Yongliang Yang | Lianqing Liu
Source: Nano-Micro Letters (article, 2024-11-11)
Field: Chemistry — Organic Chemistry

Nanograting-Based Dynamic Structural Colors Using Heterogeneous Materials Dynamic structural colors can change in response to different environmental stimuli. This ability remains effective even when the size of the species responsible for the structural color is reduced to a few micrometers, providing a promising sensing mechanism for solving microenvironmental sensing problems in micro-robotics and microfluidics. However, the lack of dynamic structural colors that can encode rapidly, easily integrate, and accurately reflect changes in physical quantities hinders their use in microscale sensing applications. Herein, we present a 2.5-dimensional dynamic structural color based on nanogratings of heterogeneous materials, which were obtained by interweaving a pH-responsive hydrogel with an IP-L photoresist. Transverse gratings printed with pH-responsive hydrogels elongated the period of longitudinal grating in the swollen state, resulting in pH-tuned structural colors at a 45° incidence. Moreover, the patterned encoding and array printing of dynamic structural colors were achieved using grayscale stripe images to accurately encode the periods and heights of the nanogrid structures. Overall, dynamic structural color networks exhibit promising potential for applications in information encryption and in situ sensing for microfluidic chips. Structural coloration ; Computer science ; Computer graphics (images) ; Materials science ; Computer vision ; Optoelectronics Polydiacetylene-based materials and applications ; Photonic Crystals and Applications ; Advanced Materials and Mechanics
Authors: Graham Merrington | Lisa H. Nowell | C. Peck
Source: Integrated Environmental Assessment and Management (article, 2024-02-08)
Field: Chemistry — Physical and Theoretical Chemistry

An introduction to Criteria for Reporting and Evaluating Exposure Datasets (CREED) for use in environmental assessments Risks posed by environmental exposure to chemicals are routinely assessed to inform activities ranging from environmental status reporting to authorization and registration of chemicals for commercial uses. Environmental risk assessment generally relies on two key values generated from exposure data and ecotoxicity data. Data sets of measured concentrations of chemicals in environmental matrices, referred to here as exposure data, are widely used to support environmental risk management, decision-making, and reporting, such as for chemical screening, ecological or human health risk assessments, and establishment of guidelines. Practitioners have developed schemes to determine the suitability of ecotoxicity data for specific purposes, focused on evaluating reliability and relevance, but analogous schemes are not available for exposure data. Moreover, regulatory guidance arguably provides less resolution on reporting and evaluating exposure data sets compared to ecotoxicity data. The evaluation of exposure data sets is subject to limitations from variable or unreported data quality objectives and/or from differences in expert judgments, potentially introducing bias and leading to decisions based on flawed and/or inconsistent information. Exposure data sets should be evaluated for reliability and relevance prior to use in environmental assessments. This paper is the first of a four-paper series detailing the outcomes of a Society of Environmental Toxicology and Chemistry technical workshop that has developed Criteria for Reporting and Evaluating Exposure Datasets (CREED). The workshop participants developed practical, systematic criteria for consistent and transparent evaluation of the reliability (quality) and relevance (fitness for purpose) of exposure data. This guidance should apply to many different (unspecified) purposes of assessment. CREED can be used to evaluate existing data sets, but can also inform data generators interested in improving their data collection and reporting to maximize data utility to other users. This first paper details existing frameworks for the evaluation of exposure data sets and demonstrates the need for CREED, drawing from different regulatory assessments, and describes the technical workshop. Integr Environ Assess Manag 2024;20:975-980. © 2024 SETAC. Creed ; Computer science ; Environmental health ; Medicine ; Political science History and advancements in chemistry ; Health, Environment, Cognitive Aging ; Environmental and Social Impact Assessments