bluuebunny/crossref_metadata_2025_split huggingface dataset:
Controllable synthesis of Pt nanoparticles on graphene oxide nanosheets and its application for electrochemical determination of dopamine
Authors: Zhang Xinjin , Yan Bo , Peng Lei , Zhao Jie , Zheng Jianbin 
Published: January 2023

AbstractEstablishing effective strategies to improve the performance of catalyst is a major area of interest within the field of electrochemical detection. In this paper, the nanocomposites of Pt catalyst with different morphologies decorated GO surface were successfully synthesized. The feature and diversity of Pt nanoparticles were confirmed by transmission electron microscope. The electrocatalytic performance and electroactive area of various modified electrodes were examined by cyclic voltammetry. According to Randles‐Sevick equation, the active area of electrode modified with the shape of concave cube Pt nanoparticles is the largest. Moreover, compared with the other common stable planes, the concave cube Pt nanoparticles bound by high‐index facets have the strongest current response. Furthermore, dopamine can be detected by amperometry at a typical working potential of 0.2 V (versus SCE) with a detection limit of 0.74 μM (at the signal‐to‐noise ratio of 3), over two wide linear ranges (3 μM–0.7 mM and 0.7 mM–4 mM). The sensing electrode also exhibited good reproducibility, stability and selectivity for dopamine determination.
Synthesis of Novel 5‐Oxo‐1,2,4‐Oxadiazole Derivatives as Antitubercular Agents and Their Molecular Docking Study toward Enoyl Reductase (InhA) Enzyme
Authors: Reddy B. Raja Sekhara , Babu K Sudakar , Mulakayala Naveen , Gajulapalli V. Pratap Reddy 
Published: January 2023

AbstractAn analogue of novel 3‐(1‐(4‐(benzoyl) benzyl)‐1H‐indol‐5‐yl)‐1,2,4‐oxadiazol‐5(4H)‐ones were synthesized in good yields (80–90 %), and its anti‐tubercular (anti‐TB) activity was investigated. All synthesized compounds (7 a–u) showed significant deterioration in the proliferation of the Mycobacterium tuberculosis H37Rv strain. A structure‐activity relationship (SAR) study was performed to identify compounds with mixed anti‐tubercular profiles. These compounds′ minimum inhibitory concentration (MIC) ranged between 0.78 and 25 μg/mL, comparable to standard drugs such as Ethambutol. Moreover, the derivative (7 l) (MIC of 0.78 μg/mL), amongst other 5‐oxo‐1,2,4‐oxadiazole, conferred anti‐TB activity more efficiently than Ethambutol (MIC of 1.56 μg/mL) when tested against all bacterial strains. Additionally, molecular docking studies were used against the mycobacterial enoyl reductase (InhA) enzyme to understand the binding modes of the potent compounds (7 l) and (7 m). Also evaluated were these molecules for in silico ADMET and drug similarity features. Thus, this study identified novel 5‐oxo‐1,2,4‐oxadiazoles as potential targets against tuberculosis. Further optimization of the molecule (7 l) could increase potency and aid in creating newer and better targets against M. tuberculosis.
Water‐Assisted Passerini Reactions under Mechanochemical Activation: A Simple and Straightforward Access to Oxindole Derivatives
Authors: Salami Sodeeq Aderotimi , Smith Vincent J. , Krause Rui W. M. 
Published: January 2023

AbstractA protocol based on the Passerini Multi‐Component reaction (MCR) has been developed for facile, efficient, environmentally benign and atom economical synthesis of a small library of biologically important oxindole derivatives employing isatin, benzoic acid and substituted isocyanides. In contrast to the conventional approach, which requires the use of toxic organic solvents, Passerini reactions were completed in 10–15 minutes under mechanochemical conditions with excellent yields. The protocol described below allows the modular synthesis of diverse compounds under green chemistry principles, specifically in favourable environmental conditions, with great atom economy, shorter reaction time, cleaner reactions with improved yields, and experimental simplicity.
An Efficient Synthesis of Rivaroxaban
Authors: Lin Xiaoyu , Li Nanlian , Zhu Chenlong , Sun Bingfeng 
Published: January 2023

AbstractAn efficient synthesis of rivaroxaban has been accomplished by a sequence spanning five steps from 4‐morpholinoaniline and (S)‐2‐(oxiran‐2‐ylmethyl)isoindoline‐1,3‐dione with an overall yield of 44 %. This synthesis is concise, environmentally benign and cost‐effective, providing a good basis for the development of a new process for rivaroxaban.
An Oxidative Enzyme Boosting Mechanical and Optical Performance of Densified Wood Films
Authors: Koskela Salla , Wang Shennan , Li Lengwan , Zha Li , Berglund Lars A. , Zhou Qi 
Published: January 2023

AbstractNature has evolved elegant ways to alter the wood cell wall structure through carbohydrate‐active enzymes, offering environmentally friendly solutions to tailor the microstructure of wood for high‐performance materials. In this work, the cell wall structure of delignified wood is modified under mild reaction conditions using an oxidative enzyme, lytic polysaccharide monooxygenase (LPMO). LPMO oxidation results in nanofibrillation of cellulose microfibril bundles inside the wood cell wall, allowing densification of delignified wood under ambient conditions and low pressure into transparent anisotropic films. The enzymatic nanofibrillation facilitates microfibril fusion and enhances the adhesion between the adjacent wood fiber cells during densification process, thereby significantly improving the mechanical performance of the films in both longitudinal and transverse directions. These results improve the understanding of LPMO‐induced microstructural changes in wood and offer an environmentally friendly alternative for harsh chemical treatments and energy‐intensive densification processes thus representing a significant advance in sustainable production of high‐performance wood‐derived materials.
Reactivation of Anticancer Immunity by Resetting Interorgan Crosstalk in Immune‐Suppressive Cells with a Nanoparticulated Anti‐Inflammatory Drug
Authors: Doi Mizuki , Tanaka Hiroki , Ohoto Takara , Miura Naoya , Sakurai Yu , Hatakeyama Hiroto , Akita Hidetaka 
Published: January 2023

AbstractThe reactivation of anticancer immunity is a fundamental principle in cancer immunotherapy as evidenced by the use of immune checkpoint inhibitors (ICIs). While treatment with the ICIs is shown to have remarkable and durable therapeutic effects in the responders, the low objective response rate (<40%) continues to be a major problem. Since myeloid‐derived suppressor cells (MDSCs), heterogenous cells with strong immunosuppressive activity that originate in the hematopoietic system, suppress the anticancer immunity via parallel immune checkpoint‐dependent and independent pathways, these cells are potential targets for improving the efficacy of cancer immunotherapy. In this study, it is demonstrated that MDSCs can be depleted by delivering synthetic glucocorticoid dexamethasone to phagocytic cells in the spleen using a lipid nanoparticle. Since the interaction of nanoparticles with T cells is intrinsically poor, this strategy also enables the “detargeting” from T cells, thus avoiding the nonspecific suppression of cytotoxic immune responses against cancer cells. In addition to the direct anticancer effect of the nanoparticulated dexamethasone, their synergistic anticancer effect with ICIs is also reported.
Water as a Modifier in a Hybrid Coordination Network Glass
Authors: Sørensen Søren S. , Ren Xiangting , Du Tao , Traverson Ayoub , Xi Shibo , Jensen Lars R. , Bauchy Mathieu , Horike Satoshi , Wang John , Smedskjaer Morten M. 
Published: January 2023

AbstractChemical diversification of hybrid organic–inorganic glasses remains limited, especially compared to traditional oxide glasses, for which property tuning is possible through addition of weakly bonded modifier cations. In this work, it is shown that water can depolymerize polyhedra with labile metal–ligand bonds in a cobalt‐based coordination network, yielding a series of nonstoichiometric glasses. Calorimetric, spectroscopic, and simulation studies demonstrate that the added water molecules promote the breakage of network bonds and coordination number changes, leading to lower melting and glass transition temperatures. These structural changes modify the physical and chemical properties of the melt‐quenched glass, with strong parallels to the “modifier” concept in oxides. It is shown that this approach also applies to other transition metal‐based coordination networks, and it will thus enable diversification of hybrid glass chemistry, including nonstoichiometric glass compositions, tuning of properties, and a significant rise in the number of glass‐forming hybrid systems by allowing them to melt before thermal decomposition.
Synthesis of Thermally Stable and Highly Luminescent Cs5Cu3Cl6I2 Nanocrystals with Nonlinear Optical Response
Authors: Jang Changhee , Kim Kangyong , Nho Hak‐Won , Lee Seung Min , Mubarok Hanif , Han Joo Hyeong , Kim Hyeonjung , Lee Dongryeol , Jang Yangpil , Lee Min Hyung , Kwon Oh‐Hoon , Kwak Sang Kyu , Im Won Bin , Song Myoung Hoon , Park Jongnam 
Published: January 2023

AbstractLow‐dimensional Cu(I)‐based metal halide materials are gaining attention due to their low toxicity, high stability and unique luminescence mechanism, which is mediated by self‐trapped excitons (STEs). Among them, Cs5Cu3Cl6I2, which emits blue light, is a promising candidate for applications as a next‐generation blue‐emitting material. In this article, an optimized colloidal process to synthesize uniform Cs5Cu3Cl6I2 nanocrystals (NCs) with a superior quantum yield (QY) is proposed. In addition, precise control of the synthesis parameters, enabling anisotropic growth and emission wavelength shifting is demonstrated. The synthesized Cs5Cu3Cl6I2 NCs have an excellent photoluminescence (PL) retention rate, even at high temperature, and exhibit high stability over multiple heating–cooling cycles under ambient conditions. Moreover, under 850‐nm femtosecond laser irradiation, the NCs exhibit three‐photon absorption (3PA)‐induced PL, highlighting the possibility of utilizing their nonlinear optical properties. Such thermally stable and highly luminescent Cs5Cu3Cl6I2 NCs with nonlinear optical properties overcome the limitations of conventional blue‐emitting nanomaterials. These findings provide insights into the mechanism of the colloidal synthesis of Cs5Cu3Cl6I2 NCs and a foundation for further research.
Controllable CO2 Reduction or Hydrocarbon Oxidation Driven by Entire Solar via Silver Quantum Dots Direct Photocatalysis
Authors: Xue Ruiting , Ge Peng , Xie Jun , Hu Ziyuan , Wang Xikui , Li Peiqi 
Published: January 2023

AbstractThe current solar‐chemical‐industry based on semiconductor photocatalyst is impractical. Metal catalysts are extensively employed in thermal‐ and electro‐catalysis industries, but unsuitable for direct‐driven photocatalysis. Herein, silver quantum dots (Ag‐QDs) are synthesized on support via an in situ photoreduction method, and in situ photocatalysis temperature programmed dynamics chemisorption desorption analyses are designed to demonstrate that Ag‐QDs should be the actual photocatalytic sites. The surface plasmon resonance of Ag‐QDs could harvests entire visible solar, and the plasmon‐driven charge‐transfer exhibits opposite directions at the interface when supports are different. Consequently, Ag‐QDs could be alternatively regulated as oxidation or reduction active centers. Furthermore, Ag‐QDs excite electron tunneling transfer with adsorbate, which does not generate high‐energy free‐radical intermediates. As a result, the efficiencies of hydrocarbon photooxidation and CO2 photoreduction are improved in several orders of magnitude. Evidently, the Ag‐QDs direct photocatalytic technology greatly promotes solar‐chemical‐industry applications.
Boosting Electrochemical Catalysis and Nonenzymatic Sensing Toward Glucose by Single‐Atom Pt Supported on Cu@CuO Core–Shell Nanowires
Authors: Zhao Yuanmeng , Jiang Yunhao , Mo Yan , Zhai Yueming , Liu Juejing , Strzelecki Andrew C. , Guo Xiaofeng , Shan Changsheng 
Published: January 2023

AbstractIt is critical to develop high‐performance electrocatalyst for electrochemical nonenzymatic glucose sensing. In this work, a single‐atom Pt supported on Cu@CuO core–shell nanowires (Pt1/Cu@CuO NWs) for electrochemical nonenzymatic glucose sensor is designed. Pt1/Cu@CuO NWs exhibit excellent electrocatalytic oxidation toward glucose with 70 mV lower onset potential (0.131 V) and 2.4 times higher response current than Cu NWs. Sensors fabricated using Pt1/Cu@CuO NWs also show high sensitivity (852.163 µA mM−1 cm−2), low detection limit (3.6 µM), wide linear range (0.01–5.18 µM), excellent selectivity, and great long‐term stability. The outstanding sensing performance of Pt1/Cu@CuO NWs, investigated by experiments and density functional theory (DFT) calculations, is attributed to the synergistic effect between Pt single atoms and Cu@CuO core–shell nanowires that generates strong binding energy of glucose on the nanowires. The work provides a new pathway for exploring highly active SACs for electrochemical nonenzymatic glucose sensor.
Heterocyclic Modulated Electronic States of Alkynyl‐Containing Conjugated Microporous Polymers for Efficient Oxygen Reduction
Authors: Zhao Zijie , Wang Binbin , You Zhihu , Zhang Qiankun , Song Weichen , Long Xiaojing 
Published: January 2023

AbstractThe oxygen reduction reaction (ORR) is a key process in green energy conversion technology. Heteroatom doping has been proven to be a prospective strategy to prepare metal‐free carbon‐based electrocatalysts, but such methods often suffer from uncontrollable catalyst frameworks and imprecise active sites. Herein, an organic heterocyclic strategy is adopted to modulate the charge redistribution of alkynyl‐containing conjugated microporous polymers (CMPs) by introducing varied five‐membered heterocyclic structures. Among these CMPs, the S, 2N‐containing thiadiazole heterocyclic molecule (CMP‐Tdz) with carbonized alginate materials (CCA) displays a remarkable quasi‐four‐electron‐transfer ORR pathway, exhibiting an excellent half‐wave potential (E1/2) of 0.77 V, coupled with superior methanol tolerance and electrochemical stability, which are among the highest performance in the metal‐free organic catalytic material systems. Density functional theory calculations prove that the high catalytic performance of these catalysts originates from the sp‐hybridized C atom (site–2) which is activated by their adjacent heterocyclic structures. Importantly, the five‐membered heterocyclic structures can also modulate the local charge distribution, and increase dipole moment, with significantly improved catalytic kinetics. This incorporation of chemically designed heterocyclic‐containing alkynyl‐CMPs provides a new approach to developing efficient metal‐free carbon‐based electrocatalysts for fuel cells.
2D Covalent Organic Frameworks Based on Heteroacene Units
Authors: Guo Fu , Zhang Weifeng , Yang Shuai , Wang Liping , Yu Gui 
Published: January 2023

AbstractCovalent organic frameworks (COFs) are a unique new class of porous materials that arrange building units into periodic ordered frameworks through strong covalent bonds. Accompanied with structural rigidity and well‐defined geometry, heteroacene‐based COFs have natural advantages in constructing COFs with high stability and crystallinity. Heteroacene‐based COFs usually have high physical and chemical properties, and their extended π‐conjugation also leads to relatively low energy gap, effectively promoting π‐electron delocalization between network units. Owing to excellent electron‐withdrawing or ‐donating ability, heteroacene units have incomparable advantages in the preparation of donor–acceptor type COFs. Therefore, the physicochemical robust and fully conjugated heteroacene‐based COFs solve the problem of traditional COFs lacking π–π interaction and chemical stability. In recent years, significant breakthroughs are made in this field, the choice of various linking modes and building blocks has fundamentally ensured the final applications of COFs. It is of great significance to summarize the heteroacene‐based COFs for improving its complexity and controllability. This review first introduces the linkages in heteroacene‐based COFs, including reversible and irreversible linkages. Subsequently, some representative building blocks are summarized, and their related applications are especially emphasized. Finally, conclusion and perspectives for future research on heteroacene‐based COFs are presented.
Exciton diffusion and dissociation in organic and quantum‐dot solar cells
Authors: He Dan , Zeng Miao , Zhang Zhenzhen , Bai Yang , Xing Guichuan , Cheng Hui‐Ming , Lin Yuze 
Published: January 2023

AbstractFor the process of photovoltaic conversion in organic solar cells (OSCs) and quantum‐dot solar cells (QDSCs), three of four steps are determined by exciton behavior, namely, exciton generation, exciton diffusion, and exciton dissociation. Therefore, it is of great importance to regulate exciton behavior in OSCs and QDSCs for achieving high power conversion efficiency. Due to the rapid development in materials and device fabrication, great progress has been made to manage the exciton behavior to achieve prolonged exciton diffusion length and improved exciton dissociation in recent years. In this review, we first introduce the parameters that affect exciton behavior, followed by the methods to measure exciton diffusion length. Then, we provide an overview of the recent advances with regard to exciton behavior investigation in OSCs and QDSCs, including exciton lifetime, exciton diffusion coefficient, and exciton dissociation. Finally, we propose future directions in deepening the understanding of exciton behavior and boosting the performance of OSCs and QDSCs.
Optical Amplification at 637 and 1067 nm Based on Organic Molecule AQ(PhDPA)2 and NdIII Complex Codoped Polymer Waveguides
Authors: Huang Yuyang , Man Yi , Xie Guohua , Wang Ce , Zhang Baoping , Xu Hui , Fu Hongyan , Zhu Jiyun , Lv Ziyue , Ying Leiying , Xia Feng , Zhang Dan 
Published: January 2023

AbstractBased on the molecular energy transfer mechanism, relative gains at 1067 and 637 nm wavelengths are achieved in thermally activated delayed fluorescence molecule AQ(PhDPA)2 and Nd complex with chelating phosphine oxide as ligands codoped polymer waveguides, with the excitation of low‐power UV light‐emitting diodes (LEDs) instead of traditional semiconductor lasers as pump sources. For AQ(PhDPA)2‐Nd(DBTTA)3(DBFDPO) (DBTTA = dibenzotetrathienoacene, DBFDPO = 4,6‐bis (diphenylphosphoryl) dibenzofuran) ‐codoped polymethylmethacrylate (PMMA), and AQ(PhDPA)2‐Nd(DBTTA)3(FDPO) (FDPO = 9,9‐bis (diphenylphosphorylphenyl) fluorene)‐codoped PMMA polymers with a mass ratio of 1:4 respectively, when they are spin‐coated as upper claddings, the relative gains of 2.2 and 1.8 dB cm−1 at 1067 nm are obtained in evanescent‐field waveguides with cross‐section of 4 × 8 µm2 under excitation of 300 mW 405 nm LED, and the gains of 3.9 and 4.9 dB cm−1 at 637 nm are achieved with pumping of 530 mW 450 nm LED respectively. By growing a 100 nm‐thick aluminum reflector with the waveguides, the optical gain at 1067 and 637 nm can be enhanced to 3.5 and 6.1 dB cm−1, corresponding to AQ(PhDPA)2‐Nd(DBTTA)3(DBFDPO) and AQ(PhDPA)2‐Nd(DBTTA)3(FDPO)‐codoped PMMA polymers, respectively.
High‐Voltage MXene‐Based Supercapacitors: Present Status and Future Perspectives
Authors: Zhu Yuanyuan , Ma Jiaxin , Das Pratteek , Wang Sen , Wu Zhong‐Shuai 
Published: January 2023

AbstractAs an emerging class of 2D materials, MXene exhibits broad prospects in the field of supercapacitors (SCs). However, the working voltage of MXene‐based SCs is relatively limited (typically ≤ 0.6 V) due to the oxidation of MXene electrode and the decomposition of electrolyte, ultimately leading to low energy density of the device. To solve this issue, high‐voltage MXene‐based electrodes and corresponding matchable electrolytes are developed urgently to extend the voltage window of MXene‐based SCs. Herein, a comprehensive overview and systematic discussion regarding the effects of electrolytes (aqueous, organic, and ionic liquid electrolytes), asymmetric device configuration, and material modification on the operating voltage of MXene‐based SCs, is presented. A deep dive is taken into the latest advances in electrolyte design, structure regulation, and high‐voltage mechanism of MXene‐based SCs. Last, the future perspectives on high‐voltage MXene‐based SCs and their possible development directions are outlined and discussed in depth, providing new insights for the rational design and realization of advanced next‐generation MXene‐based electrodes and high‐voltage electrolytes.
A numerical perspective for CFRP‐wrapped thin‐walled steel cylinders
Authors: Aydin Abdulkadir Cüneyt , Maali Mahyar , Kiliç Mahmut , Bayrak Bariş , Akarsu Oğuzhan 
Published: January 2023

AbstractThe failure of steel cylindrical shells with carbon fiber‐reinforced polymers (CFRP) under hydrostatic pressure is studied in this article by experimental tests and the finite element method. Simulations were performed for 12 cylindrical shells with different dent numbers, dent depths, and two perfect models with and without CFRP. The finite element models are built to simulate the buckling behavior. The nonlinear stabilization method is preferred to simulate the buckling behavior. The finite element results agree well with the corresponding experimental tests and theories. A parametric study is conducted, and the number, depth, width of dents, and the effects of CFRPs on the critical buckling pressure are discussed. The dents are placed symmetrically around the cylinder with a thickness of tc (thickness of cylinder) and 2tc mm. The initial and overall buckling load decreased with increasing amplitude for dent numbers with different dent depths on all models. The results show that the number and depth of dents generally have a negative effect on the buckling strength, while CFRPs increase the critical buckling strength and are effective in repair as a retrofitting concept.