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Topic Review
Optimizing Efficiency and Exploring Greenhouse-Integrated Organic Photovoltaics
Organic solar cells present distinct advantages including transparency, cost-effective manufacturing potential, and tunable light absorption properties. Recent years have witnessed the development of various strategies aimed at enhancing the performance of Organic solar cells. Utilizing the high optical selectivity and tunability of organic semiconductors, the application of organic photovoltaics in greenhouse integration has also been explored. Tackling the efficiency challenges could be the pivotal factor that shifts organic photovoltaics from a promising technology to a commercial reality.
  • 755
  • 30 Aug 2023
Topic Review
Factors Affecting Wear Performance of Medium Manganese Steels
Medium manganese steels (MMSs) have garnered increased attention and interest due to their relatively low cost and superior combination properties compared to other steels. In particular, MMSs have been recognised as ideal wear-resistant materials employed in the mining industry. The key factors that affect the wear performance of MMSs include the elemental composition in MMSs and the phase transformation occurred during TRIP and TWIP as well as various heat treatment processes.
  • 742
  • 11 Jul 2023
Topic Review
Flexible Piezoresistive Arrays
Spatial distribution perception has become an important trend for flexible pressure sensors, which endows wearable health devices, bionic robots, and human–machine interactive interfaces (HMI) with more precise tactile perception capabilities. Flexible pressure sensor arrays can monitor and extract abundant health information to assist in medical detection and diagnosis. Bionic robots and HMI with higher tactile perception abilities will maximize the freedom of human hands. Flexible arrays based on piezoresistive mechanisms have been extensively researched due to the high performance of pressure-sensing properties and simple readout principles.
  • 740
  • 28 Jul 2023
Topic Review
Types of Skin Wounds and Wound Healing
Chronic wounds encompass various types, each exhibiting distinct characteristics that are influenced by changes in the wound microenvironment. Parameters such as temperature, pH value, blood glucose concentration, and pressure undergo fluctuations depending on the type and condition of the wound. Hydrogels, composed of hydrophilic polymers, are promising materials for constructing multifunctional platforms. These hydrogels possess several advantageous properties, including a 3D network structure, high permeability to water and oxygen, and biocompatibility. 
  • 738
  • 27 Sep 2023
Topic Review
Intermetallic Compounds for Hydrogen Storage
Intermetallic compounds have attracted great attention because of their wide application in the development of Hstorage alloys. There are many applications for intermetallic compounds, including Hstorage systems, Nickel Metal Hydride (NiMH) battery electrodes, Hsensors and catalysts, and cooling systems. Intermetallic compounds are attractive in the development of Hstorage alloys because they can absorb large amounts of H. In addition, they are abundant and have diverse ingredients.
  • 734
  • 09 Feb 2023
Topic Review
Immobilized Nanomaterials for Energy Production
Nanomaterials (NMs) have been extensively used in several environmental applications; however, their widespread dissemination at full scale is hindered by difficulties keeping them active in engineered systems. Thus, several strategies to immobilize NMs for their environmental utilization have been established and are described in the present text, emphasizing their role in the production of renewable energies, the removal of priority pollutants, as well as greenhouse gases, from industrial streams, by both biological and physicochemical processes. The challenges to optimize the application of immobilized NMs and the relevant research topics to consider in future research are also presented to encourage the scientific community to respond to current needs.
  • 716
  • 01 Nov 2022
Topic Review
Effect of Carbon Nanotubes on Tin-Based Lead-Free Solders
Carbon nanotubes (CNTs) are being applied with increasing frequency for advanced soldering. They have excellent mechanical, electrical, and thermal properties and are primarily used to reinforce lead-free solders. The addition of CNTs can effectively improve the ultimate tensile strength, microhardness, shear strength, and creep resistance of the solder. However, the practical application of CNT composite solders has been a challenge for researchers for decades. The most significant issue is uniform dispersion due to the large density and surface differences between CNTs and solders. Other concerns are the structural integrity of CNTs and their limited addition amount, solder wettability, and interfacial bonding. CNT composite solders can only be widely used in a real sense when these challenges are properly addressed and overcome.
  • 714
  • 26 May 2023
Topic Review
(Fe-Co-Ni-Zn)-Based Metal–Organic Framework-Derived Electrocatalyst for Zinc–Air Batteries
Zinc–air batteries (ZABs) have garnered significant interest as a viable substitute for lithium-ion batteries (LIBs), primarily due to their impressive energy density and low cost. However, the efficacy of zinc–air batteries is heavily dependent on electrocatalysts, which play a vital role in enhancing reaction efficiency and stability. This research highlights the crucial significance of electrocatalysts in zinc–air batteries and explores the rationale behind employing Fe-Co-Ni-Zn-based metal–organic framework (MOF)-derived hybrid materials as potential electrocatalysts. These MOF-derived electrocatalysts offer advantages such as abundancy, high catalytic activity, tunability, and structural stability. Various synthesis methods and characterization techniques are employed to optimize the properties of MOF-derived electrocatalysts. Such electrocatalysts exhibit excellent catalytic activity, stability, and selectivity, making them suitable for applications in ZABs. Furthermore, they demonstrate notable capabilities in the realm of ZABs, encompassing elevated energy density, efficacy, and prolonged longevity. It is imperative to continue extensively researching and developing this area to propel the advancement of ZAB technology forward and pave the way for its practical implementation across diverse fields.
  • 705
  • 16 Oct 2023
Topic Review
Smart Polymer Materials for 4D Printing
Among the innovative materials gaining attention are smart materials, characterized by their ability to undergo changes in properties, such as shape, color, or size, in response to external stimuli like light, heat, humidity, or electric and magnetic fields. This class of programmable materials introduces a unique dimension to 3D printing, referred to as 4D printing. In 4D printing, the same process as 3D printing is used, but the printed objects possess the remarkable capability to dynamically transform their shape or properties over time in response to external stimuli. Some smart polymers exhibit minimal responses over extended periods or possess limited reversibility in their transformations. Despite the need for further advancement in achieving swift and precise transformations in 4D-printed objects, the realm of 4D printing presents novel opportunities across diverse applications such as textiles, aerospace, medical industries, electronics, and robotics.
  • 697
  • 25 Jan 2024
Topic Review
Recovery of Waste-Printed Circuit Boards Non-Metallic Components
The reutilization non-metallic components from a waste-printed circuit board (WPCB) has become one of the most significant bottlenecks in the comprehensive reuse of electronic wastes due to its low value and complex compositions, and it has received great attention from scientific and industrial researchers. To effectively address the environmental pollution caused by inappropriate recycling methods, such as incineration and landfill, extensive efforts have been dedicated to achieving the high value-added reutilization of WPCB non-metals in sustainable polymer composites.
  • 690
  • 11 Sep 2023
Topic Review
Biopolymeric Carbon as Electrode and ILs as Electrolytes
Electrochemical capacitors (also called supercapacitors) are an important segment of the clean energy portfolio due to their high-power density and long cycle life. The energy storage mechanism in supercapacitors is based on the electric charge buildup by a charge–discharge process (electrosorption) at the electrode–electrolyte interface and/or redox reactions on the electroactive surface.
  • 677
  • 12 May 2023
Topic Review
Processing Methods of Low-Clinker Multi-Component Cementitious Materials
The wide use of multi-component cement of highly reduced Portland clinker factor is largely impeded by detrimental changes in the rheological properties of concrete mixes, a substantial reduction in the early rate of cement hardening, and sometimes the insufficient strength of mature concrete. Therefore, major changes are needed in traditional concrete-production technologies if low-clinker cement is to gain wider acceptance. 
  • 655
  • 25 Jan 2024
Topic Review
Cobalt Sulfide-Based Composite Material for Photocatalysis
Photocatalysis, as an inexpensive and safe technology to convert solar energy, is essential for the efficient utilization of sustainable renewable energy sources. Earth-abundant cobalt sulfide-based composites have generated great interest in the field of solar fuel conversion because of their cheap, diverse structures and facile preparation.
  • 644
  • 27 Mar 2023
Topic Review
Composite Materials Related to Bone
Bones are composite materials consisting of organic polymers (mainly type I collagen), carbonated apatite, and water, with volume fractions of 35–45%, 35–45%, and 15–25%, respectively. Carbonated apatite in bone contributes to rigidity, while organic polymers and water contribute to toughness. The inorganic crystal, carbonated apatite, is a plate-shaped crystal with dimensions of 50 nm × 25 nm × 1–4 nm, generating a significant organic–inorganic interface, due to its nanoscale size. This interface is believed to absorb externally applied forces to dissipate mechanical energy to thermal energy. Crystallization of calcium phosphate in a solution or in a dispersion of a polymer attracts interest as a biomimetic synthesis of the bone-like composites.
  • 644
  • 14 Nov 2023
Topic Review
Components of the Nanocomposite Photoanisotropic Materials
A new approach has emerged that has been extensively studied by many research groups, namely doping azobenzene-containing materials with nanoparticles with various compositions, sizes, and morphologies. The resulting nanocomposites have shown significant enhancement in their photoanisotropic response, including increased photoinduced birefringence, leading to a higher diffraction efficiency and a larger surface relief modulation in the case of polarization holographic recordings. 
  • 642
  • 01 Dec 2023
Topic Review
Antibacterial Polymer Composite Materials
The escalating presence of pathogenic microbes has spurred a heightened interest in antimicrobial polymer composites tailored for hygiene applications. These innovative composites ingeniously incorporate potent antimicrobial agents such as metals, metal oxides, and carbon derivatives. This integration equips them with the unique ability to offer robust and persistent protection against a diverse array of pathogens. By effectively countering the challenges posed by microbial contamination, these pioneering composites hold the potential to create safer environments and contribute to the advancement of public health on a substantial scale.
  • 618
  • 24 Nov 2023
Topic Review
Bast-Fibre-Reinforced Hybrid Composites
Bast hybrid composites can be utilised in different applications, opening new platforms for developing novel products that compete with traditional hybrid composites. Various polymeric materials and processing techniques have been used to manufacture bast hybrid composites with attractive properties, such as renewability, low density, and cost-effectiveness. In most cases, the fibres were chemically modified in order to improve their adhesion with the host polymeric materials. 
  • 576
  • 22 Sep 2023
Topic Review
Bio-Based Polymers for Environmentally Friendly Phase Change Materials
Phase change materials (PCMs) have received increasing attention in recent years as they enable the storage of thermal energy in the form of sensible and latent heat, and they are used in advanced technical solutions for the conservation of sustainable and waste energy. Importantly, most of the currently applied PCMs are produced from non-renewable sources and their carbon footprint is associated with some environmental impact. However, novel PCMs can also be designed and fabricated using green materials without or with a slight impact on the environment.
  • 497
  • 07 Feb 2024
Topic Review
Three-Dimensional Printing Techniques Applied to DDS Area
Three-dimensional printing (3DP) technologies are characterized as a set of innovative manufacturing techniques that allow for the creation of complex and/or personalized three-dimensional physical objects on the work surface of a 3D printing machine (based on the computer-aided design (CAD) project designs of these parts). Three-dimensional printing techniques are widely used in various areas of knowledge, such as education, engineering, and biomedicine.
  • 468
  • 23 Jan 2024
Topic Review
Graphene–Polymer Nanocomposite Foams for Electromagnetic Interference Shielding
Graphene, a unique carbon nanomaterial with a two-dimensional structure and exceptional electrical and mechanical properties, offers advantages such as flexibility, light weight, good chemical stability, and high electromagnetic shielding efficiency. Consequently, it has emerged as an ideal filler in electromagnetic shielding composites, garnering significant attention. In order to meet the requirements of high efficiency and low weight for electromagnetic shielding materials, researchers have explored the use of graphene–polymer nanocomposite foams with a cellular structure. 
  • 437
  • 19 Oct 2023
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