Confined CVD Synthesis and Temperature-Dependent Spectroscopic Properties of Bilayer Graphene Ribbon Arrays with Bifunctional Modulation of Adhesion Metal.

Bilayer graphene ribbons (GRs) hold great promise for the fabrication of next-generation nanodevices, thanks to unparalleled electronic properties, especially the tunable bandgap in association with twist angle, ribbon width, edge structure, and interlayer coupling. A common challenge in manufacturing bilayer GRs via templated chemical vapor deposition (CVD) approach is uncontrollable dewetting of micro- and nano-scaled patterned metal substrates. Herein, a confined CVD synthetic strategy of bilayer GR arrays is proposed, by utilizing the bifunctional Ni as a buffered adhesion layer to regulate the anisotropic dewetting of metal film in the V-groove and as a carbon-dissolution regulated metal to initiate the bilayer nucleation.

Synthesis of N-doped Carbon Quantum Dots as an Effective Fluorescent Sensor of Fe Ions and a Potent Antibacterial Agent.

In this study, a simple and efficient method for synthesizing nitrogen-doped carbon quantum dots (N-CQDs) has been developed through a one-step hydrothermal process using hedyotis diffusa willd. The morphology, chemical composition, and optical properties of the resulting N-CQDs were thoroughly characterized. The synthesized N-CQDs exhibited a spherical shape with an average particle size of 4.

High-Efficiency Catalytic Ozonation Degradation of Ni Complex Wastewater Using Mn-N Codoped Active Carbon Catalyst.

With the rapid development of electroless nickel (Ni) plating industry, a large amount of Ni complex wastewater is inevitably produced, which is a serious threat to the ecological environment. Herein, a novel Mn-N codoped active carbon (Mn-N@AC) catalyst with high catalytic ozonation ability was synthesized by the impregnation precipitation method and was characterized by BET, XRD, Raman, SEM, FTIR, and TPR. Meanwhile, Mn-N@AC showed excellent catalytic ozonation ability, stability, and applicability.

Experimental study on CO huff and puff in the Daqing Fuyu tight oil reservoir with online NMR.

Tight oil is a typical unconventional resource, and enhancing its recovery rate remains a challenge in current development efforts. In this study targeting the Daqing Fuyu tight oil reservoir, we combine a high-temperature and high-pressure long core physical simulation apparatus and a high-temperature and high-pressure online Nuclear Magnetic Resonance (NMR) testing system to conduct indoor simulation experiments on CO huff and puff in long cores. The results indicate that in the process, it is primarily the oil from micro-pores that is initially mobilized, but further along mobilization of fluids from a portion of sub-micro-pores and nanopores is enhanced, with an efficiency ranging from 25 to 33 %.

Critical depth prediction based on in-situ stress and gas content model of deep coalbed methane in Liupanshui Coalfield in China.

In-situ stress plays a pivotal role in influencing the desorption, adsorption, and transportation of coalbed methane. The reservoir gas content represents a pivotal physical parameter, encapsulating both the coalbed methane enrichment capacity and the underlying enrichment law of the reservoir. This investigation collates, computes, and consolidates data concerning pore pressure, breakdown pressure, closure pressure, triaxial principal stress, gas content, lateral pressure coefficient, and other pertinent variables from coal reservoirs within several coal-bearing synclines in the Liupanshui coalfield, China.

Investigation of combustion characteristics of critical quenching hydrogen mixing ratios in the presence of ordered porous media.

In order to promote low-carbon sustainable development in the ecological environment and improve the efficiency of hydrogen and natural gas energy utilization, this project carried out research on the explosive effects of different thicknesses of ordered porous media on the hydrogen-methane gas mixture. A detailed discussion was conducted based on the critical quenching hydrogen blending ratio under the thicknesses of 50 mm and 60 mm of ordered porous media. The results indicate that the critical quenching hydrogen blending ratio is 9% for a thickness of 50 mm and 20% for a thickness of 60 mm, indicating that greater thickness enhances flame suppression capabilities.

Recent Progress of Substituted Allylboron Compounds in Catalytic Asymmetric Allylation Reactions.

The catalytic asymmetric allylation reaction involving allylboron species has emerged as a powerful tool to access highly stereoselective allylation products. In the early years, most of the researches focused on the reaction of unsubstituted allylboronates with ketones or imines. With the synthesis of complex substituted allylboronates, allylboronic acids and allyltrifluoroborates, the type of reactions and the variety of substrates are greatly expanded.

Recent Research Progress of Benzothiazole Derivative Based Fluorescent Probes for Reactive Oxygen (HO HClO) and Sulfide (HS) Recognition.

Fluorescent sensing technology has advantages such as high sensitivity, good selectivity, and easy operation. It is widely used in the environment and biomedical field and receives increasing attention from people. It is easy to modify the structure of the benzothiazole fluorophores, and adding the push-pull electronic system can regulate the optical properties of benzodiapylene molecules.

Scale effects of supplementary nature reserves on biodiversity conservation in China's southern hilly region.

The Southern Hilly Region (SHR) of China plays a critical role in maintaining national ecological security and supporting global biodiversity. However, intensified human activities, such as urbanization and excessive land exploitation, have led to significant ecological degradation, posing threats to both local and global biodiversity. The current nature reserve system in SHR no longer meets the demands for local biodiversity conservation.

monitoring of quorum sensing signalling molecules using a SERS chip with a micro -chamber array.

The monitoring of quorum sensing (QS) signal molecules in bacterial biofilms is crucial for the diagnosis and treatment of bacterial biofilms. In this work, a surface-enhanced Raman scattering (SERS) chip integrated with functional units of bacterial biofilms and SERS detection is proposed for the monitoring of pyocyanine, an important signal molecule and biomarker secreted by . The SERS chip was composed of a top self-assembled nano-silver SERS substrate layer, a PDMS layer containing a micro-chamber array and bottom quartz layer.

A review of self-healing hydrogels for bone repair and regeneration: Materials, mechanisms, and applications.

Bone defects, which arise from various factors such as trauma, tumor resection, and infection, present a significant clinical challenge. There is an urgent need to develop new biomaterials capable of repairing a wide array of damage and defects in bone tissue. Self-healing hydrogels, a groundbreaking advancement in the field of biomaterials, displaying remarkable ability to regenerate damaged connections after partial severing, thus offering a promising solution for bone defect repair.

Facile synthesis of highly efficient fluorescent silicon quantum dots used for highly sensitive sensor of tetracycline in honey samples and antibacterial agent.

The excessive use of antibiotics and the presence of tetracycline (TC) residues poses a significant threat to human health. It is imperative to develop antibacterial materials which address the issue of bacterial resistance as well as to establish reliable methods for detecting TC to ensure food safety. This study reports the synthesis of silicon quantum dots (SiQDs) with blue fluorescence emission at 420 nm via a hydrothermal method, using allyloxytrimethylsilane, triacetoxy(methyl)silane as the silicon sources and sodium citrate as a reducing agent.

Advancements and Challenges in Nanoscale Zero-Valent Iron-Activated Persulfate Technology for the Removal of Endocrine-Disrupting Chemicals.

Endocrine-disrupting chemicals are a new class of pollutants that can affect hormonal metabolic processes in animals and humans. They can enter the aquatic environment through various pathways and gradually become enriched, thus posing a serious threat to the endocrine and physiological systems of both animals and humans. Nano zero-valent iron has promising applications in endocrine disruptor removal due to its excellent reducing properties and high specific surface area.

A Facile Label-Free Colorimetric Assay for DNase I Activity Based on the Peroxidase-Like Activity of Functional Nucleic Acids.

DNase I plays a crucial role in fundamental biological processes, including gene expression, DNA repair, and apoptosis. Therefore, it is important to develop a simple and efficient method to detect DNase I activity. In this work, a colorimetric assay based on functional nucleic acid for sensitive DNase I detection was reported.

Research on the timing for subsequent water flooding in Alkali-Surfactant-Polymer flooding in Daqing Oilfield based on automated machine learning.

Determining the optimal timing for subsequent water flooding in Alkali-Surfactant-Polymer (ASP) flooding is essential to maximizing both the technical and economic outcomes of oilfield blocks. This study identified eight critical parameters that influence the benefits of ASP flooding and established parameter ranges based on data from completed blocks and actual field measurements. The optimal timing for subsequent water flooding was determined by evaluating cumulative net profit variations throughout the ASP flooding lifecycle.

Methane Gas Transport in Ca-MMT Shale Nanoslits Considering Water Content Effects: Insights from Molecular Dynamics Simulations.

Two-phase flow remains a significant challenge in the development of water-bearing shale gas, particularly regarding the flow of gases through clay minerals in such formations. Nonequilibrium molecular dynamics simulation is investigated to research the two-phase flow of water (HO) and methane (CH) through Ca-montmorillonite (MMT) shale nanoslits. The results indicate that water molecules preferentially adsorb onto the surfaces of the Ca-MMT shale nanoslits, leading to the formation of water bridges within the nanoslits as water content increases.

Development of pH-sensitive chitosan/plant extract microcapsules: Enhanced corrosion protection for carbon steel in HCl solution.

In recent years, controlled-release green corrosion inhibitors have become a research hotspot in the field of corrosion. In this study, chitosan/plant extract microcapsules (GCI@CS) loaded with Ambrosia artemisiifolia extract (green corrosion inhibitor, GCI) were prepared by emulsification cross-linking. Both the functional groups and micromorphology of GCI@CS were characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and optical microscopy (OM).

Enhanced visible-light-driven photocatalytic degradation via in-situ AIS/ZIS high-low junctions.

The I-III-VI QDs Ag-In-S (AIS) exhibits excellent properties in photocatalysis because of the adjustable band gap, wide light absorption range, and multiple active sites. Introducing homologous or heterogeneous ions not only derives the composition into quaternary/ quinary quantum dots but also generates new sulfide QDs to form composites, which is an effective strategy to promote photoactivity. In this work, we in-situ synthesized the AIS/ZIS (AgInS/ZnInS) composite photocatalyst by introducing Zn and changing the reaction temperature.

6π 1,5-Diaza-electrocyclization of Isatin, α-Ketoester Derived Hydrazones with α,β-Unsaturated Ketoesters, Ketones, and Aldehydes Enables Functionalized Pyrazoles.

A novel and efficient 6π 1,5-diaza-electrocyclization of readily available isatin, α-ketoester derived hydrazones with α,β-unsaturated ketoesters, ketones, and aldehydes has been developed. A series of functionalized pyrazoles bearing an oxindole unit were easily afforded by this tool with good yields and high functional group tolerance under mild conditions. Importantly, the obtained pyrazole could be further converted to 3-pyrazolecarboxylic acid with a quaternary carbon stereocenter.