jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Miki Kariya | Kenichiro Omoto | Kaoru Nomura | Kento Yonezawa | Hironari Kamikubo | Toshio Nishino | Tomomi Inoie | Gwénaël Rapenne | Kazuma Yasuhara
Source: Chemical Communications (article, 2024-01-01)
Field: Materials Science — Biomaterials

Lipid cubic phase with an organic–inorganic hybrid structure formed by organoalkoxysilane lipid A lipid cubic phase encompassing a cross-linked siloxane structure was formed by the self-assembly of a synthetic organoalkoxysilane lipid in water. The spontaneous sol-gel reaction of the alkoxysilane moiety on the lipid head group produced an organic-inorganic hybrid material with a double gyroid <i>Ia</i>3<i>d</i> cubic structure. Gyroid ; Moiety ; Siloxane ; Phase (matter) ; Chemistry ; Crystallography ; Materials science ; Organic chemistry ; Chemical engineering ; Polymer chemistry ; Copolymer ; Polymer Supramolecular Self-Assembly in Materials ; Diatoms and Algae Research ; Polydiacetylene-based materials and applications
Authors: Maria-Athina Apostolaki | Elias Sakellis | Polychronis Tsipas | S. Gardelis | V. Likodimos
Source:  (article, 2024-04-12)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Surface-Enhanced Raman Spectroscopy on Ag−WO3/TiO2 Inverse Opal Film Substrates The synergetic effects of electromagnetic and chemical enhancements via the combination of semiconductor nanomaterials with noble metal nanoparticles is crucial to the performance of surface-enhanced Raman scattering (SERS). Here, WO3/TiO2 photonic crystal films in the form of three-dimensional inverse opals were fabricated via the co-assembly of polymer colloidal templates with water-soluble precursors in order to simultaneously grow both constituent metal oxides with tailored electronic properties and photonic band gaps. The surface modification of compositionally tuned WO3/TiO2 inverse opals by Ag nanoparticles is demonstrated to be an efficient method to boost SERS efficiency in the detection of 4−mercaptobenzoic acid via the synergy of plasmonic effects with charge transfer and slow-light trapping. Materials science ; Nanomaterials ; Photonic crystal ; Raman spectroscopy ; Plasmon ; Nanoparticle ; Raman scattering ; Surface-enhanced Raman spectroscopy ; Colloidal crystal ; Nanotechnology ; Crystal violet ; Spectroscopy ; Semiconductor ; Optoelectronics ; Photonics ; Chemical engineering ; Colloid ; Optics Gold and Silver Nanoparticles Synthesis and Applications ; Nonlinear Optical Materials Studies ; Quantum Dots Synthesis And Properties
Authors: Haneen H. Salman | Asra Ali Hussein
Source: Salud Ciencia y Tecnología - Serie de Conferencias (article, 2024-01-01)
Field: Materials Science — Biomaterials

Fabrication and comperization Study the effect of molecular weight for chitosan blended with polyvinyl alcohol for food packaging application This research concentrates on the fabrication and characterization of biodegradable food packaging composed of Chitosan and polyvinyl alcohol (PVA), both possessing antioxidant and antibacterial activates. Simultaneously, the aim is to enhance the degradation of food packaging materials, safeguarding the environment against the hazards of pollution caused by food packaging waste, thereby safeguarding human health. The study explores the impact of different molecular weight biopolymers combined with synthetic polymers by incorporating various molecular weights of chitosan and polyvinyl alcohol PVA in different ratios (pure MMW-CS, LMW-Cs, PVA, 70:30, and 90:10). Films were created using the solvent casting method to fabricate and characterize biodegradable food packaging from these biopolymers, aiming to mitigate environmental pollution caused by food packaging waste and its adverse effects on human health. Various tests were conducted, and the comparison between MMW_CS and LMW_Cs revealed that the most effective combination was found to be (pure and 70 % MMW_CS). This combination exhibited superior antibacterial properties, enhanced biofilm formation, favorable contact angle, UV resistance, as well as improved results in AFM and DSC analyses. The chitosan content played a significant role in augmenting the antibacterial activity and reducing roughness in the AFM test. Moreover, chitosan-based films demonstrated exceptional UV absorbance, providing a protective shield against lipid oxidation induced by UV light, thereby preserving the quality of the packaged food Polyvinyl alcohol ; Chitosan ; Fabrication ; Food packaging ; Materials science ; Active packaging ; Polymer science ; Chemical engineering ; Food science ; Composite material ; Chemistry ; Engineering ; Medicine Nanocomposite Films for Food Packaging ; biodegradable polymer synthesis and properties ; Conducting polymers and applications
Authors: Ai-Mei Zhou | Denan Li | Mingshu Tan | Yanpei Lv | Simin Pang | Xinxing Zhao | Zhifu Shi | Jun Zhang | Feng Jin | Shi Liu | Lei Sun
Source: ChemRxiv (preprint, 2024-07-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Phononic Modulation of Spin-Lattice Relaxation in Molecular Qubit Frameworks The advancement of molecular quantum information science demands solid-state integration of molecular electron spin qubits. With highly ordered structures and rational designability, microporous framework materials offer ideal matrices to host qubits. They exhibit tunable phonon dispersion relations and spin distributions, enabling optimization of essential qubit properties including the spin-lattice relaxation time (T1) and decoherence time. In this study, through spin dynamic and vibrational spectroscopic characterizations of two radical-embedded framework materials, we show that hydrogen-bonded networks give rise to a low Debye temperature of acoustic phonons and generates sub-terahertz optical phonons, both of which facilitate spin-lattice relaxation. Whereas deuterating hydrogen-bonded networks reduces both phonon frequencies and T1, eliminating such flexible structural motifs in the structure raises phonon dispersions and improves the T1 by one to two orders of magnitude. The phononic tunability of spin-lattice relaxation in molecular qubit frameworks would facilitate the development of solid-state qubits operating at elevated temperatures. Qubit ; Phonon ; Condensed matter physics ; Quantum decoherence ; Spin engineering ; Relaxation (psychology) ; Materials science ; Quantum computer ; Spin (aerodynamics) ; Physics ; Quantum ; Quantum mechanics ; Spin polarization ; Electron Organic and Molecular Conductors Research ; Perovskite Materials and Applications ; Electron Spin Resonance Studies
Authors: Cristian Villa-Pérez | Luis J. Mendoza Herrera | Jesica M. J. Santillán | David Muñetón Arboleda | M. Sergio Moreno | Valeria B. Arce
Source: arXiv (Cornell University) (preprint, 2024-12-27)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Silver Nanoplates: Theoretical and Experimental Characterization. Study of SERS Application Metal nanostructures have received significant attention in recent years owing to their peculiar physical and chemical properties, which span a wide range of practical applications in a variety of scientific and engineering fields. Herein, we report a study of the optical properties and application in the field enhancement of silver nanoplates (Ag-Nplates) obtained by two-step chemical synthesis. Optical Extinction Spectroscopy (OES), together with a detailed theoretical analysis of the experimental spectra, was used to characterize the size distribution, morphology, and optical spectral behavior of the obtained suspensions. These studies were complemented with shape and size distribution analyses using Transmission Electron Microscopy (TEM). It was observed by both techniques that these characteristics are related to the concentration of silver spherical nanoparticles (Ag-Seeds) added during the synthesis of Ag-Nplates. A decrease in the Ag-Seed amount produces an infrared shift of the main plasmon peak with respect to the neat Ag-Seeds suspension, which is related to the size growth of Ag-Nplates showing size distributions centered in the edge length range of 12-15 nm and 34-36 nm for the experimental spectra, whose plasmon peak positions are at 543 nm (higher Ag-Seeds concentration) and 815 nm (lower Ag-Seed concentration), respectively. The detection of Brilliant Blue (BB) by Surface-Enhanced Raman Spectroscopy (SERS) was successfully probed with the incorporation of Ag-Nplates in an agarose gel. Characterization (materials science) ; Nanotechnology ; Materials science Gold and Silver Nanoparticles Synthesis and Applications ; Laser-Ablation Synthesis of Nanoparticles ; Nanocluster Synthesis and Applications
Authors: Hao Zhao | Pengyao Sun | Hui Xu | Xinyi Xiao | Zhiyuan Kong | Shaojia Song | Weihao Li | L.X. Liu | Jiadong Wang | Xiaobo Pan
Source: Catalysts (article, 2024-10-14)
Field: Materials Science — Materials Chemistry

Spirobifluorene-Based D-A Type Conjugated Polymer Photocatalysts for Water Splitting Exploring synthetic pathways for efficient photocatalysts has always been a major goal in catalysis. The performance of organic photocatalysts is affected by a variety of complex factors, and how to understand the structure–effect relationship is the key to designing efficient photocatalysts. This work explored the feasibility of constructing large-specific-surface-area conjugated microporous polymers (CMPs) based on stereoscopic units like spirobifluorene and achieving efficient photocatalytic activity by modulating the donor–acceptor (D-A) ratio with dibenzothiophene sulfone. Crosslinked pore structures were successfully constructed, and the specific surface area increased with the ratio of spirobifluorene. When the molar ratio of D-A was 1:20, polymer Spso-3 showed the highest photocatalytic hydrogen production activity, at 22.4 mmol h–1 g–1. The findings indicate that constructing D-A type CMPs should be a promising approach to improving the performance of photocatalytic water separation. The appropriate push–pull effect of the D-A structure promotes the photo-induced separation of electron–hole pairs, and the porous structure built on steric units offers ample space for catalytic reactions. This work could provide case references for structural design and the structure–effect relationship of efficient polymer photocatalysts. Photocatalysis ; Materials science ; Polymer ; Conjugated system ; Steric effects ; Catalysis ; Chemical engineering ; Acceptor ; Specific surface area ; Microporous material ; Nanotechnology ; Chemistry ; Organic chemistry ; Composite material Covalent Organic Framework Applications ; Advanced Photocatalysis Techniques ; Metal-Organic Frameworks: Synthesis and Applications
Authors: S. S. CHATTERJEE
Source: International Journal of Advanced Multidisciplinary Research and Studies (article, 2024-05-04)
Field: Chemistry — Inorganic Chemistry

A selective discussion on oxo-bridged diiron (III,III) centers in chemistry related to bio-functional activity Diiron (III, III) oxo- bridged core is playing significant role in various biologically active compounds. Several synthetic diiron compounds are prepared which are the structural and functional models of these bio active centers. Extensive study over these compounds helps us to gain an idea about the mechanistic pathways adopted in the bio active centers. In vivo studies are highly expensive and critical. Analysis of these complexes outside the bio-environment is comparatively simple but give us an idea about the mechanistic overview of the metal centers which guide us for further proceedings. Chemistry ; Active site ; Combinatorial chemistry ; Nanotechnology ; Catalysis ; Biochemistry ; Materials science Metal-Catalyzed Oxygenation Mechanisms ; Metal complexes synthesis and properties ; Metalloenzymes and iron-sulfur proteins
Authors: Weitao Ye | Hai-Na Feng | Zhihui Zhang | Liang Zhang
Source: STAR Protocols (article, 2024-01-06)
Field: Chemistry — Organic Chemistry

A protocol for the stereoselective synthesis of a Star of David [2]catenane Most complex prime links exhibit inherent topological chirality, yet their high stereoinduction remains a rare occurrence. Here, we present a protocol for the stereoselective synthesis of a molecular link comprising two triple entwined rings. We describe steps for constructing the precursor circular helicate, performing ring closure metathesis, and demetallation. We also outline procedures for bio-beads separation and data analysis. This protocol holds promise for applications in molecular nanotopology. For complete details on the use and execution of this protocol, please refer to Zhang et al. (2022).<sup>1</sup>. Catenane ; Chirality (physics) ; Metathesis ; Protocol (science) ; Stereoselectivity ; Computer science ; Combinatorial chemistry ; Stereochemistry ; Chemistry ; Physics ; Molecule ; Polymerization ; Catalysis ; Organic chemistry ; Medicine Supramolecular Chemistry and Complexes ; Chemical Synthesis and Analysis ; Synthetic Organic Chemistry Methods
Authors: Wei-Tong Li
Source: MATEC Web of Conferences (article, 2024-01-01)
Field: Chemistry — Organic Chemistry

Research progress on magnetic nanosorbent materials for industrial wastewater treatment In today’s increasingly serious environmental problems, water treatment technology has become a worldwide research hot spot. At present, as the harmful components of polluted water are becoming more and more complex, the requirements for treatment process are getting higher and higher, so it is difficult for a single technology to purify sewage completely. In this context, interdisciplinary multi-technology has become the development trend in water treatment, and magnetic nanomaterials have the advantages of high efficiency and rapidity compared with the traditional technology, so they have a greater potential for development. This paper will be divided into the research background, the main types of industrial wastewater, the current classification of magnetic nanomaterials, the surface functionalization of composite magnetic nanomaterials, including inorganic materials composite and organic materials composite two kinds of composite materials, the material desorption and recovery, as well as the direction of the future development and some challenges to be faced to introduce the magnetic nanoscale adsorbent materials in wastewater treatment of the current research in several aspects. Sewage treatment ; Industrial wastewater treatment ; Wastewater ; Environmental science ; Environmental engineering Nanomaterials for catalytic reactions ; Advanced Nanomaterials in Catalysis ; Graphene and Nanomaterials Applications
Authors: Dongxing Dun | Min Zhu | Hongfu Zhou | Jian Li | Jing Hu
Source: Research Square (preprint, 2024-02-08)
Field: Materials Science — Biomaterials

Crystallization behaviors of chain extended poly (lactic acid) modified with ST-NAB3 and its improved mechanical and thermal properties Abstract The widespread use of traditional petroleum-based plastics is causing significant environmental pollution for example microplastics issues, due to its non-biodegradability. Poly (lactic acid) (PLA) as a representative biodegradable polymer is a promising candidate to replace petroleum-based plastics in some fields of disposable packaging materials and tableware. In this work, in order to improve the poor crystallization, mechanical and heat resistance performances of PLA, styrene-acrylonitrile-glycidyl methacrylate (SAG) as a chain extender and octamethylenedicarboxylic dibenzoylhydrazide (ST-NAB3) as a heterogeneous nucleating agent (HNA) were added simultaneously into PLA matrix. The chain-extended PLA (CPLA) with branch structures had smaller crystal sizes and higher crystal density, compared with those of pure PLA. In addition, thanks to the nucleation effect of ST-NAB3 and the development of “shish-kebab”, this tendency became more pronounced in CPLA/HNA systems. It was worth mentioning that, CPLA with the ST-NAB3 content of 1 wt.% (CPLA-1) possessed the highest crystallinity of 43.6%. Meanwhile, CPLA-1 had the best impact strength and heat deformation temperature of 38.9 kJ/m 2 and 91.3°C respectively, which had increased by 11.3 kJ/m 2 and 32.4°C contrast to pure PLA. On the whole, this study proposed a simple and effective method, which provided a new possibility for PLA modification research. Crystallization ; Lactic acid ; Chain (unit) ; Materials science ; Thermal ; Chemical engineering ; Polymer chemistry ; Thermodynamics ; Physics ; Engineering biodegradable polymer synthesis and properties ; Bone Tissue Engineering Materials ; Carbon dioxide utilization in catalysis
Authors: Bijak Riyandi Ahadito | Zelyka Putri | Nova Yuliasari | Ady Mara | Desnelli Desnelli | Addy Rachmat
Source:  (article, 2024-01-01)
Field: Chemistry — Organic Chemistry

Esterification of Fatty Acid Catalyzed by Ga2O3-Impregnated Sulfated Zirconia Mesopore Heterogeneous catalysts are considered as valuable materials in enhancing many chemical reactions to obtain specific products. Solid acid catalyst such as sulfated zirconia (SZ) is a promising catalyst with morphology and acidity properties that can be tuned up. In this research, we utilize the meso Sulfation ; Cubic zirconia ; Mesoporous material ; Catalysis ; Chemistry ; Fatty acid ; Biochemistry ; Organic chemistry Chemical Synthesis and Reactions ; Zeolite Catalysis and Synthesis
Authors: Jiaoyang Meng
Source: Transactions on Computer Science and Intelligent Systems Research (article, 2024-11-25)
Field: Materials Science — Polymers and Plastics

All-Polymer Solar Cells Based on Wide-Band Gap Conjugated Polymers Recently, there has been an increased utilization of wide bandgap polymer electron donors in non-fullerene organic polymer solar cells. Consequently, scientists and engineers worldwide have shown substantial interest and research focus on all-polymer solar cells utilizing wide bandgap conjugated polymers. These advanced materials provide distinct benefits in terms of adjustable electronic properties, superior effectiveness, and possibility for cost-effective manufacturing, making them a central focus for the advancement of future solar energy technologies. This article will begin by giving a detailed summary of the progression of all-polymer solar cell development in recent decades. We will track the major achievements and advancements that have influenced the field of organic photovoltaics, from its earliest discovery to the most recent progress in polymer chemistry and device engineering. This historical viewpoint will focus on the continuous initiatives and advancements that have propelled the enhancements in performance and expanded the range of applications for polymer solar cells. Afterwards, the article will outline the fundamental layout and functioning principles of polymer solar cells. We will investigate the basic elements such as the active layer, charge transport layers, and electrodes, and demonstrate how these components work together to convert sunlight into electrical energy. In conclusion, the paper will explore the studies on donor materials of conjugated polymers with wide bandgaps. These materials are now seen as crucial elements needed to improve power conversion efficiencies and enhance stability in polymer solar cells. Organic solar cell ; Photovoltaic system ; Photovoltaics ; Nanotechnology ; Polymer ; Materials science ; Hybrid solar cell ; Solar cell ; Band gap ; Polymer solar cell ; Conjugated system ; Engineering physics ; Optoelectronics ; Electrical engineering ; Engineering Conducting polymers and applications ; Organic Electronics and Photovoltaics
Authors: Mihai C. Suster | Aleksandra Szymańska | Tomasz J. Antosiewicz | Agata Królikowska | Piotr Wróbel
Source: arXiv (Cornell University) (preprint, 2024-12-18)
Field: Materials Science — Materials Chemistry

Nanogap-Engineered Core-Shell-Like Nanostructures for Comprehensive SERS Analysis Development of fabrication protocols for large-area plasmonic nanostructures with sub-10 nm gaps with a spatially controlled distribution is critical for their real-world applications. In this work, we develop a simple, cleanroom-free protocol for the fabrication of macroscopic-sized plasmonic substrates (&gt;6 cm^2), featuring a tunable multi-resonance optical response and light concentration in sub-10 nm gaps. Critically, these gaps are free to interact with the surrounding medium. This architecture consists of non-periodically distributed dielectric nanospheres coated with a metal multilayer, forming semi-spherical core-shell-like nanostructures (CSLNs) surrounded by a planar film. The sub-10 nm gaps formed between metal caps and the planar film are easily tuned by adjusting fabrication parameters such as multimetal layer thickness, composition, or nanosphere size and density. The excellent structural homogeneity, wide optical tunability, and extreme light confinement in the spatially controlled subwavelength nanogaps make CSLN-based substrates an ideal platform for comprehensive surface-enhanced Raman scattering (SERS) spectroscopy. This is proven through a combination of numerical modeling and iterative fabrication/characterization, leading to the optimized substrates showing cutting-edge spatial uniformity down to 1.9% determined as the relative standard deviation (RSD) of the SERS signal of p-mercaptobenzoic acid for 225 spectra over 3600 μm^2 area. High sensitivity is evidenced by an enhancement factor of ~10^6. The proposed substrates also meet all other demanding criteria, including sufficient signal temporal stability (RSD &lt;4%), high substrate-to-substrate reproducibility (&lt;15%), and SERS activity towards three various analytes. The unique geometry and wide spectral tunability of the CSLN substrates will also be of great value for other plasmon-driven applications. Nanotechnology ; Core (optical fiber) ; Nanostructure ; Shell (structure) ; Materials science ; Composite material Advanced Nanomaterials in Catalysis ; Gold and Silver Nanoparticles Synthesis and Applications ; Advanced biosensing and bioanalysis techniques
Authors: Ibukun Oluwaseun Shotonwa | Adebayo Ponle Oduwole | Oluwapelumi Martin Agosu | A. Yusuf | Simeon Okechukwu Eze
Source: European Journal of Chemistry (article, 2024-09-30)
Field: Chemistry — Organic Chemistry

Single and mixed dithiocarbamato metal(III) complexes (Co, Rh, and Ir): Crystal and molecular structure description and interplay This review focuses on the crystal and molecular structures of single and mixed dithiocarbamate ligands of cobalt, rhodium, and iridium in the +3 oxidation state. The complexities of their chelating and bridging modes come into play through modification of the substituents on the carbamate nitrogen atoms of the ligands and additional coordination of secondary phosphino-containing ligands, culminating in various applications such as biological, analytical, medicine, and catalysis. Other considerations include the geometrical coordination environments around the metal centres and their comparison with isostructural congeners. The distortions around the metal centres and their subsequent effects on the symmetries of bonds in the primary and secondary coordination spheres are discussed. The trans-effects of secondary P-ligands and their effects on geometrical alignment and structural stability have become valuable yardsticks in analyzing structural modifications and stabilities. Chemistry ; Metal ; Crystal structure ; Rhodium ; Single crystal ; Crystallography ; Stereochemistry ; Catalysis ; Organic chemistry Organometallic Compounds Synthesis and Characterization ; Crystal structures of chemical compounds ; Metal complexes synthesis and properties