Abstract Nanomaterials with intrinsic enzyme-like activities (nanozymes), have been widely used as artificial enzymes in biomedicine. However, how to control their vivo performance a target cell is still challenging. Here we report strategy coordinate nanozymes tumor cells and selectively perform activity destruct tumors. We develop nanozyme using nitrogen-doped porous carbon nanospheres which possess four (oxidase, peroxidase, catalase superoxide dismutase) responsible for reactive oxygen...

Nanozymes, as a new generation of artificial enzymes, offer great opportunities in biomedical engineering and disease treatment. Synergizing the multiple intrinsic functions nanozymes can improve their performance biological systems. Here, we report novel nanozyme with yolk-shell structure fabricated by combining single gold nanoparticle core porous hollow carbon shell nanospheres (Au@HCNs). Au@HCNs exhibited enzyme-like activities similar to horseradish peroxidase oxidase under an acidic...

Composites of LDPE filled with different amounts graphene nanoplatelets (GnP) were prepared in form films by means precoating technique and single screw melt-extrusion using two types screws, compression mixing. This manufacturing process imposes strong anisotropy on the sample's morphology, which become oriented along extrusion direction. Such orientation GnP matrix is confirmed scanning electron microscopy observations it yields unique electrical properties. As compared to pure LDPE,...

The most common type of extruded power cable insulation is based on cross-linked polyethylene (XLPE), which cannot be recycled as a thermoplastic material. Hence, materials currently receive considerable attention because they would allow recycling through re-melting. In particular blends (PE) and polypropylene (PP) compelling alternative to XLPE, provided that the poor compatibility two polymers can overcome. Here, we establish an approach exploits in situ formation PE–PP-type copolymer...

Abstract Poly(3‐hexylthiophene) (P3HT) is found to be a highly effective conductivity‐reducing additive for low‐density polyethylene (LDPE), which introduces new application area the field of conjugated polymers. Additives that reduce direct‐current (DC) electrical conductivity an insulation material at high electric fields have gained lot research interest because they may facilitate design more efficient high‐voltage power cables. An ultralow concentration regio‐regular P3HT 0.0005 wt% DC...

ABSTRACT High voltage insulation materials must combine excellent dielectric and thermomechanical properties. Ternary blends based on isotactic polypropylene (PP) tend to feature a low electrical conductivity high melting temperature but are usually characterized by too ductility. Here, it is shown that the cooling rate can be used significantly improve ductility without compromising otherwise property portfolio. Rapid of ternary comprising PP, low‐density polyethylene (LDPE) polystyrene‐ b...

Abstract Polyethylene based ionomers are demonstrated to feature a thermo‐mechanical and dielectric property portfolio that is comparable cross‐linked polyethylene (XLPE), which may enable the design of more sustainable high voltage direct‐current (HVDC) power cables, crucial component future electricity grids seamlessly integrate renewable sources energy. A new type ionomer obtained via high‐pressure/high‐temperature free radical copolymerization ethylene in presence small amounts ion‐pair...

Accurately quantifying the aerodynamic forces acting on vehicles and long-span bridges is critical for assessing safety of moving which are subjected to strong wind. It necessary consider interference between bridge, especially this with bluff body section wind barriers. However, very few investigations have been carried out find coefficients a bridge considering effect barrier. This article therefore tunnel tests determine container truck π-cross The influence vehicle position in different...

Investigations of bulk dielectric properties specimens extracted from in-service aged and UHVDC composite insulator sheds are reported in this paper. The program the study included measurements DC conductivity complex permittivity at frequency range 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> -10 xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> Hz various temperatures dry wet (water immersion) conditions. obtained results...

To design reliable high voltage cables, clean materials with superior insulating properties capable of operating at electric field levels elevated temperatures are required. This study aims the electrical characterization a byproduct-free crosslinked copolymer blend, which is seen as promising alternative to conventional peroxide polyethylene currently used for direct current cable insulation. The entails (DC) conductivity, dielectric response and surface potential decay measurements...

Partial discharge (PD) test has been widely used in condition assessment for power cables. However, extinguish phenomenon occurred PD detection hinders the effective of potential defects cable accessories. For this reason, a novel method based on thermal excitation is proposed article to eliminate and detect earlier stage. First, physical processes activity reasons extinguishing are introduced. Then, principle mechanism described analyzed respectively, that by external heating break dynamic...

Surface potential decay characteristics of specimens extracted from in-service aged and reference HVDC composite insulator sheds are reported analyzed in this paper. In the experiments, surfaces samples were charged by dc corona was recorded utilizing a non-contact technique. addition, surface bulk conductivities determined used for analyzing means computer simulations their impact on distribution profiles its decay. Based performed trap density distributions, mobility charge carriers field...

Abstract High‐voltage direct‐current power cables are vital for the efficient transport of electricity derived from renewable sources energy. The most widely used material high‐voltage cable insulation – low‐density polyethylene (LDPE) is usually crosslinked with peroxides, a process that releases unwanted by‐products. Hence, by‐product‐free crosslinking concepts mitigate associated increase in electrical conductivity high demand. Click chemistry‐type copolymer mixtures contain glycidyl...

The impact of the composition blends comprising low-density polyethylene (LDPE), isotactic polypropylene (PP) and a styrenic copolymer additive on thermomechanical properties as well direct-current (DC) electrical thermal conductivity is investigated. presence 5 weight percent (wt%) strongly reduces amount PP that needed to enhance storage modulus above melting temperature LDPE from 40 24 wt%. At same time, improves consistency resulting ternary blends. While both DC decrease with content,...

Abstract The impact of a small amount polystyrene‐ b ‐poly(ethylene‐ co ‐butylene)‐ ‐polystyrene (SEBS) on the thermomechanical and electrical properties blends comprising low‐density polyethylene (LDPE) isotactic polypropylene (PP) is investigated. SEBS found to assemble at PP:LDPE interface as well within isolated PP domains. addition 10 wt% significantly increases storage modulus between melting temperatures two polyolefins, 110 160°C, results in improved resistance creep during both...

Destruction of the spherulite structure in low-density polyethylene (LDPE) is shown to result a more insulating material at low temperatures, while reverse effect observed high temperatures. On average, change morphology reduced conductivity by factor 4, but this morphology-related decrease was relatively small compared with drop than 2 decades that after slight oxidation LDPE (at 25 °C and 30 kV mm-1). The measured different temperatures (25-60 °C) electrical field strengths (3.3-30 mm-1)...

Polymer nanocomposites are the material of choice for dc insulation. The emerging demand high-capacity high voltage direct current (HVdc) power transmission requires polymer capable safe and stable operation at temperatures. However, high-temperature electrical properties still unsatisfactory. Here, we report that modulation polymer/nanoparticle interfaces can greatly improve insulation polypropylene (PP)-based nanocomposite recyclable HVdc cable application. nanoparticles surface-modified...

Although the cores made with amorphous metal alloy have lowered no‐load losses compared orientation silicon steel cores, a high cost and noise level are inevitable because magnetostriction for strip is larger than ordinary one. This study mainly focused on experimental systems methods magnetic properties measurement, vibration characteristics of combinations. The composite were also studied. influence annealing process energy, core analysed in detail as well. All testing results analysis...

Partial discharge measurements have important applications in evaluating insulation systems as well for dielectric materials studies. This work investigates a measurement technique to study partial activity by measuring the PD loss current. The method is similar response and measures current through test object with without PD. By comparing current, all conduction processes, both fast slow, can be explored. contrast traditional pulse detections, where only transients been measured....

In this research, nano-TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> of various diameters is added to cellulose and pressboard made enhance its anti-thermal aging characteristics. After thermally the samples, partial discharge inception voltage (PDIV), AC breakdown strength relative permittivity are measured. The results show that dielectric properties with 10 nm TiO has highest due closer match permittivity. mechanical higher than...

Octyl-silane-coated Al2O3 nanoparticles are found to be a promising conductivity-reducing additive for thermoplastic ternary blends comprising low-density polyethylene (LDPE), isotactic polypropylene and styrenic copolymer. The blend nanocomposites were prepared by compounding the components together with an LDPE-based masterbatch that contained nanoparticles. did not affect superior stiffness of blends, compared neat LDPE, between melting temperatures two polyolefins. As result, 38 wt%...

Dielectric response measurements are an important technique to characterize dielectric materials. However, the electrode arrangements as well accuracy of measurement setup limit precision this characterization, especially in case solid An air reference method and a contact-free arrangement described paper enhance characterization by avoiding problems introduced contacts. It is shown that performing calibration with gap filled under same conditions material tested, can improve substantially....