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Topic Review
Gas Channeling Control in CO2-Based Enhanced Oil Recovery
Gel systems are widely used as plugging materials in the oil and gas industry. Gas channeling can be mitigated by reducing the heterogeneity of the formation and the mobility ratio of CO2 to crude oil. Cracks and other CO2 leaking pathways can be plugged during the geological storage of CO2 to increase the storage stability. By adding CO2-responsive groups to the classic polymer gel’s molecular chain, CO2 responsive gel is able to seal and recognize CO2 in the formation while maintaining the superior performance of traditional polymer gel. 
  • 666
  • 08 Dec 2023
Topic Review
Progress of Dispersants for Coal Water Slurry
This article provides a comprehensive review of existing coal water slurry dispersants, and points out the existing problems and possible future development directions.
  • 656
  • 12 Dec 2023
Topic Review
Nanoparicles in Latent Fingerprinting
Latent fingerprints are commonly found at crime scenes and can provide valuable evidence for forensic investigations. However, latent fingerprints are often difficult to detect and develop, especially on porous or complex surfaces. Nanoparticles have emerged as a promising tool for the development of latent fingerprints, as they can enhance the contrast and ridge details of the fingerprint. The recent advances in the use of nanoparticles for latent fingerprint development, including gold nanoparticles, silver nanoparticles, carbon nanoparticles, copper nanoparticles, and iron oxide nanoparticles were summarized here. Current article encompasses the principles of physical and chemical interactions between nanoparticles and fingerprint residue, as well as the factors that can affect the performance of nanoparticles in latent fingerprint development. We also highlight the potential applications and limitations of nanoparticle-based fingerprint development in forensic investigations.
  • 609
  • 22 Feb 2023
Topic Review
Catalytic Materials Development for Fuel Cell Power Generators
Many research teams around the world persistently undertake attempts to create active and stable catalysts for the pre-reforming and steam reforming of diesel and kerosene fuels. The most active and stable catalysts for diesel fuel conversion are Rh- and other precious metal systems supported on oxide carriers containing mobile lattice oxygen, mainly zirconium and cerium oxides.
  • 605
  • 03 Feb 2023
Topic Review
Copper–Sulfur Composite with Carbon-Based Materials for Supercapacitors Applications
Supercapacitors (SCs) are a novel type of energy storage device that exhibit features such as a short charging time, a long service life, excellent temperature characteristics, energy saving, and environmental protection. The capacitance of SCs depends on the electrode materials. Currently, carbon-based materials, transition metal oxides/hydroxides, and conductive polymers are widely used as electrode materials. However, the low specific capacitance of carbon-based materials, high cost of transition metal oxides/hydroxides, and poor cycling performance of conductive polymers as electrodes limit their applications. Copper–sulfur compounds used as electrode materials exhibit excellent electrical conductivity, a wide voltage range, high specific capacitance, diverse structures, and abundant copper reserves, and have been widely studied in catalysis, sensors, supercapacitors, solar cells, and other fields. 
  • 588
  • 04 Mar 2024
Topic Review
Biomedical Applications of CaPO4 Deposits
The clinical applications of CaPO4 alone were largely limited to non-load-bearing areas of the body. However, investigations have continued and researchers have begun to deposit biocompatible CaPO4 on the surface of mechanically strong but biologically inert or biotoxic materials in order to combine the benefits of various materials. For example, metal implants are used in artificial joints such as hip joints and artificial tooth roots as sufficient mechanical stability is required.  Since no metal alone causes osseointegration, i.e., they do not create a mechanically stable connection between the implant and bone tissue, they are coated with CaPO4 to create osseointegration. However, the problem of osseointegration is not limited to metals. Biodegradable polymers are also generally not bioactive. Therefore, to overcome this disadvantage, the surface of those polymers is also coated with CaPO4 and can be replaced by autogenous bone after implantation, as CaPO4 is involved in the same bone regeneration response as natural bones.
  • 581
  • 07 Jul 2023
Topic Review
H2 in CO Oxidation over Ceria Catalysts
The preferential CO oxidation (so-called CO-PROX) is the selective CO oxidation amid H2-rich atmospheres, a process where ceria-based materials are consolidated catalysts. This article aims to disentangle the potential CO–H2 synergism under CO-PROX conditions on the low-index ceria surfaces (111), (110) and (100). Polycrystalline ceria, nanorods and ceria nanocubes were prepared to assess the physicochemical features of the targeted surfaces. Diffuse reflectance infrared Fourier-transformed spectroscopy (DRIFTS) shows that ceria surfaces are strongly carbonated even at room temperature by the effect of CO, with their depletion related to the CO oxidation onset. Conversely, formate species formed upon OH + CO interaction appear at temperatures around 60 °C and remain adsorbed regardless the reaction degree, indicating that these species do not take part in the CO oxidation. Density functional theory calculations (DFT) reveal that ceria facets exhibit high OH coverages all along the CO-PROX reaction, whilst CO is only chemisorbed on the (110) termination. 
  • 548
  • 13 Jan 2022
Topic Review
Catalytic Synthesis of Terminal Alkene Dimers and Oligomers
Dimers and oligomers of alkenes represent a category of compounds that are in great demand in diverse industrial sectors. Among the developing synthetic methods, the catalysis of alkene dimerization and oligomerization using transition metal salts and complexes is of undoubted interest for practical applications. 
  • 545
  • 24 Jan 2024
Topic Review
Metal-Organic Frameworks Based Multifunctional Materials for Solar Cells
Developing low-cost and stable materials for converting solar energy into electricity is vital in meeting the world’s energy demand. Metal-organic frameworks (MOFs) have gained attention for solar cells due to their natural porous architectures and tunable chemical structures. They are built by high-symmetry metal clusters as secondary building units and organic carboxylate/azolate ligands as linkers. 
  • 533
  • 17 Nov 2023
Topic Review
Wide Structural Variety and Applications of Dendrimers
Dendrimers are hyper-branched macromolecules characterized by large numbers of end-group functionalities and a compact molecular structure. They consist of a central core molecule where multiple branches emerge, giving rise to a hierarchical and well-defined architecture.
  • 489
  • 21 Nov 2023
Topic Review
Compositional Analysis of Metal(IV) Phosphate and Phosphonate Materials
Metal(IV) phosphate and phosphonates materials have increasingly found their applications in water purification, heterogeneous catalysis, drug delivery, and proton-exchange membrane fuel cells. The strong linkage between tetravalent metal cations and phosphate/phosphonate groups offers a unique bottom-up design platform, resulting in chemically stable inorganics or hybrids. Task-specific physiochemical functionalities could be deposited by modifying the phosphate/phosphonate groups before the material synthesis. The high reactivity between the metal centre and the phosphorus-containing linker, on the other hand, often leads to obtaining unordered materials (amorphous solids or coordination polymers). The chemical composition of the prepared materials is a key parameter in guiding the synthetic approach and in governing their performances.
  • 488
  • 09 Jan 2024
Topic Review
Synthesis and Modification of Magnetic Nanoparticles
Magnetic nanoparticles (MNPs) combine their magnetic properties with other interesting characteristics, such as their small size, high surface-to-volume ratio, easy handling, and excellent biocompatibility, resulting in improved specificity and sensitivity and reduced matrix effects. They can be tailored to specific applications and have been extensively used in various fields, including biosensing and clinical diagnosis. In addition, MNPs simplify sample preparation by isolating the target analytes via magnetic separation, thus reducing the analysis time and interference phenomena and improving the analytical performance of detection. The synthesis and modification of MNPs play a crucial role in adjusting their properties for different applications.
  • 478
  • 19 Oct 2023
Topic Review
CO2 Capture
In pre-combustion CO2 capture, the fuel (e.g., biomass, coal, natural gas) is firstly converted into syngas and then subjected to shift conversion to react CO and increase H2 content.
  • 452
  • 25 Jan 2024
Topic Review Peer Reviewed
Importance of High-Concentration Electrolytes for Lithium-Based Batteries
Each battery cell consists of three main components: the anode, the cathode, and the separator soaked with liquid electrolyte, the medium in the battery that allows charged ions to move between the two electrodes. Besides a wide electrochemical stability window and good compatibility with both electrodes, the electrolyte should also be safe, thermally stable and environmentally benign, showing a high ionic conductivity of the charge-carrying Li ions and finally a low price. This unique combination of properties is impossible to achieve with a simple salt–solvent mixture and usually requires a combination of different electrolyte components, i.e., several liquid solvents and additives and one or more conducting salt(s). For lithium-based batteries, which are the most common electrochemical energy storage devices today, a solution based on lithium hexafluorophosphate (LiPF6) in a mixture of organic carbonates as the solvent is used. Usually, the conducting salt concentrations used for lithium-based electrolytes are in the range of ≈1 to 1.2 M, but recently, electrolytes with much higher conducting salt concentrations of 5 M and even over 10 M have been investigated as they offer several benefits ranging from increased safety to a broadened electrochemical stability window, thus enabling cheap and safe solvents, even water.
  • 356
  • 06 Feb 2025
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