Ultrasound Parameters of Umbilical Artery Blood Flow Are Associated with Amniotic Fluid and Umbilical Artery Concentrations of Erythropoietin and Oxidative Stress InjuryRead the full article
Journal of Nanomaterials publishes research on nanoscale and nanostructured materials with an emphasis on synthesis, processing, characterization, and the applications of nanomaterials.
Journal of Nanomaterials maintains an Editorial Board of practicing researchers from around the world, to ensure manuscripts are handled by editors who are experts in the field of study.
Latest ArticlesMore articles
Preparation and Characterization of Lauric–Myristic Acid/Expanded Graphite as Composite Phase Change Energy Storage Material
Lauric acid (LA) and myristic acid (MA) were used to prepare a binary eutectic mixture. The expanded graphite (EG) was used as the carrier, and the lauric–myristic acid/expanded graphite (LA–MA/EG) composite phase change material was prepared by physical adsorption method. The microstructure, chemical structure, and thermal properties of LA–MA/EG were characterized by scanning electron microscopy (SEM), differential scanning calorimeter (DSC), Fourier transform infrared spectroscopy (FTIR), and thermal conductivity measurement. The experimental results have shown that the maximum mass ratio of the binary eutectic mixture in the LA–MA/EG composite phase change energy-storing material was 92.2%, and there was physical mixing and has no chemical reaction between LA–MA and EG. The fusion point temperature of LA–MA/EG was 33.4°C, the solidification point temperature was 33.8°C, and the latent heat was 171.1 J/g, which was suitable for building energy storage field. After several thermal cycles, the change of the fusion point and potential heat of the composite phase change materials were very small, and it still has good energy storage performance.
Preparation and Properties of Novel Superhydrophobic Cellulose Nanofiber Aerogels
The superhydrophobic cellulose nanofiber aerogels were prepared via sol-gel and subsequent freeze-drying with cellulose nanofibers as raw materials and perfluorohexyl ethyl trimethoxysilane and 3-aminopropyl trimethoxysilane as modifying monomers. The effect of volume ratio and total dosage of the two modifying monomers on the superhydrophobic properties was investigated, and the property variations of the cellulose nanofibers before and after modification were also characterized by FT-IR, XRD, TGA, SEM, XPS, and laser flash diffusivity apparatus. The results showed that the modifying monomers were successfully grafted onto cellulose nanofibers, and the prepared modified cellulose nanofiber aerogels had higher thermal stability. After modification, a micron-level arrayed three-dimensional grid superhydrophobic surface structure was constructed, and the surface energy was reduced. The prepared aerogels exhibited superhydrophobicity with a water contact angle up to 151° and excellent thermal insulation performance with a thermal conductivity of 0.035 W·m−1·K−1, which displayed promising application potential in the field of thermal insulation and waterproof materials.
Design and Analysis Comparison of Surface Acoustic Wave-Based Sensors for Fabrication Using Additive Manufacturing
Sensors have become an integral part of our everyday lives by helping us converting packets of data to make important decisions. Due to this reason, researches are done constantly to improve the fabrication processes of sensors by making them more user-friendly, less time-consuming, and more cost-effective. The application of any fabrication solution that offers those advantages will have a major impact on the manufacturing of modern sensors. To address this issue, a 3D printed Surface Acoustic Wave (SAW) temperature sensor is presented in this paper. The modelling and analysis of such a sensor have been performed for both aluminium and copper electrodes using COMSOL software. In total, 4 different sensing structures, 2 each for both aluminium and copper electrodes based one-port resonators, are designed and analysed for their application in temperature sensing. The resulting responses of those sensors are approximately 2.19 MHz and 424.01 MHz frequency ranges. The novelty lies in the possibility of mass-producing such a sensor using additive manufacturing will have a direct impact in the areas where conventional electronics cannot be utilized.
Investigation of the Morphological, Structural, and Vibrational Behaviour of Graphite Nanoplatelets
This work investigated the morphological, structural, and vibrational properties of graphite nanoplatelets (GNPs) that were produced by ultrasonication. Scanning and transmission electron microscopy, X-ray diffractometry, and Raman spectroscopy identified 120-nm-thick GNP crystallites and 50–2000 μm2 plates with different areas and shapes. Extensive exfoliation was observed by transmission electron microscopy with abundant multi and some monolayer GNPs. X-ray diffractometry confirmed 43 GNP layers along the -axis. Rietveld X-ray analysis indicated a GNP crystal lattice with stacks of parallel two-dimensional graphene layers and tightly bound hybridized carbon atoms stacked in a translational …ABAB… sequence in hexagonal rings. Raman scattering indicated well-defined GNPs with few defects and no oxide content. All analytical results reveal that GNPs could have significant potential application in electrically conductive reinforcement devices.
miRNA-146a and miRNA-202-3p Attenuate Inflammatory Response by Inhibiting TLR4, IRAK1, and TRAF6 Expressions in Rats following Spinal Cord Injury
Spinal cord injury (SCI) is a catastrophic disease that induces a complex cascade of cellular reactions at the local lesion area, including secondary cell death and inflammatory reactions. Accumulating evidence has showed pro- and anti-inflammatory roles of microRNAs (miRNAs), a class of small RNAs, in SCI. The present study is aimed at investigating the effects of two miRNAs, miRNA-146a and miRNA-202-3p, on inflammatory response after SCI. Initially, we found that the expression levels of miRNA-146a and miRNA-202-3p were increased in the plasma samples of 32 SCI patients at days 3 and 7 after admission and the rat spinal cord at days 3 and 7 after SCI modeling compared with healthy controls and sham-operated rats, respectively. The expression levels of TLR4, IRAK1, and TRAF6 were declined in the rat spinal cord at days 1, 3, and 7 after SCI modeling compared with sham-operated rats. Injection of miRNA-146a mimic or miRNA-202-3p mimic decreased TLR4, IRAK1, and TRAF6 expressions in the rat spinal cord at days 1, 3, and 7 after SCI modeling, while injection of miRNA-146a antagomir or miRNA-202-3p antagomir produced opposed results. Subsequent results showed that the expression levels of tumor necrosis factor-α (TNF-α), IL-1β, IL-6, and IL-8 were upregulated in the rat serum at days 1, 3, and 7 after SCI modeling compared with sham-operated rats. Injection of miRNA-146a mimic or miRNA-202-3p mimic decreased TNF-α, IL-1β, IL-6, and IL-8 expression levels in the rat serum at days 1, 3, and 7 after SCI modeling, while injection of miRNA-146a antagomir or miRNA-202-3p antagomir yielded opposed results. The expression levels of TNF-α, IL-1β, IL-6, and IL-8 were higher in the supernatants of PC12 cells transfected with anti-miRNA-146a or anti-miRNA-202-3p than in those transfected with si-TLR4, si-IRAK1, or si-TRAF6. These findings support the notion that miRNA-146a/miRNA-202-3p exerts anti-inflammatory functions after SCI.
Study on the Synergies of Nanoclay and MWCNTs to the Flame Retardant and Mechanical Properties of Epoxy Nanocomposites
Modern flame retardants are organic compounds containing halogen or phosphorus groups and are not always well dispersed in polymers. Thus, by using a small amount of nanoclay and multiwalled carbon nanotubes (MWCNTs), they can significantly reduce the number of conventional flame retardant additives, making the material with optimal flame retardant properties. Conventional flame retardants always have some negative effects on the mechanical properties of the polymer substrate, so by using nanoclay and MWCNTs, those adverse effects can be minimized and overcome. In this work, in order to improve the mechanical properties and flame retardant of nanocomposite materials, nanoclay I.30E and MWCNTs are mixed into epoxy, with the selected percentage of 2% and 0.02% by weight, respectively, stirring mechanically for 7, 8, and 9 hours at 3000 rpm at 80°C, then performing ultrasonic vibration for 6 hours at 65°C.