The spiral structures
of carbon-based materials such as coiled
carbon nanotube (CCNT) and graphene helicoid have attracted great
attention for use in electrical and mechanical nanodevices. There
are a couple of main reasons for this attitude such as striking properties
and behavioral diversity with regard to the ever-increasing need for
miniaturization of devices. In this research, using atomistic simulations,
the effects of geometric parameters (e.g., cross-sectional shape,
pitch angle, inner diameter, and outer diameter) on the mechanical
properties of CCNT are studied. Interestingly, the results show that
the mechanical properties (e.g., Young’s modulus, stretchability,
etc.) have a heavy reliance on CCNTs’ geometric parameters.
The stretching of the CCNT increases with the raising inner radius.
Geometric changes affect the various stages that the CCNTs encounter
during tensile and compression tests. The different mechanical behavior
of various types of CCNTs leads to their diverse applications. Thus,
these results can give an insight to design and develop new-generation
nanodevices.
The ever-increasing need for miniaturization of electromechanical devices has led us to exploit the properties of nanomaterials as well as controlling them. Chemical doping is one of the most commonly used techniques for controlling the properties of nanomaterials. Spiral carbon-based nanostructures possess excellent electrical properties, which are highly improved with chemical doping; however, the effect of chemical doping on their mechanical properties is still unknown. In this study, molecular dynamics simulation is conducted to study the effect of random/patterned boron and nitrogen doping in different percentages on the mechanical properties of spiral carbon-based nanostructures. The results show a significant impact of the geometry on the mechanical response of doped spiral nanostructures. Furthermore, increasing the percentage of the chemical doping influences the mechanical behavior of these nanoparticles, which can reduce their extensive stretchability even up to 50%. Chemical doping at the position of the pentagon/heptagon defects of nanostructures has led to interesting mechanical behavior in addition to electrical properties. Thus, using a combination of a couple of methods such as chemical doping and changing the geometry of the spiral carbon-based nanostructures opens a new avenue to control the properties of these nanostructures in proportion to their electromechanical applications.
Mechanical properties of pristine GHs along with patterned and randomly hydrogenated GHs have been investigated for various geometries and H-coverages.
The overall purpose of this study is to investigate the plausibility of employing honey impregnated nano microbial cellulose (NMC) produced in Hestrin-Schramm media as a novel wound dressing. In the initial stage, three predominant characteristics of thyme, Astragalus, and Ziziphus honey including pH, total soluble solids as well as hydrogen peroxide content were assessed. In the second stage, the zone of inhibition diameters for Escherichia coli (E. coli) and Staphylococcus aureus (S. S.areous) were examined respectively. Meanwhile, ATR-FTIR, XRD, and SEM were applied to study the chemical, physical structures, and surface morphology of NMC pellicle. In addition, Air permeability and wettability of samples were studied. The obtained results revealed that in spite of possessing the lowest amount of hydrogen peroxide, thyme honey had the uppermost antibacterial property. Furthermore, wettability and sinking time of treated NMC with thyme honey were 43% and 49% higher than the untreated NMC respectively and purified dry raw cellulose had 11% higher air permeability than dry raw cellulose in 400 Pa. According to the results, the treated NMC with thyme honey has a high potential to be applied in the medical field as a novel wound dressing.
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