scholarly journals Ultra-Structural Characteristics of Aloe vera-Based Nanofibers as MRSA-Phage Nanocarriers

2021 ◽  
Vol 12 (2) ◽  
pp. 2152-2161
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Mechanical Test ◽  
Morphological Changes ◽  
Structural Characteristics ◽  
Aloe Vera ◽  
Simultaneous Thermal Analysis ◽  
Thermal Testing ◽  
Roughness Coefficient ◽  
Elastic Module

This study investigates the mechanical, thermodynamic, and morphological changes and surface topography of Aloe vera (AV)-based nanofibers as the nanocarriers of methicillin-resistant Staphylococcus aureus (MRSA). After making the AV-based solutions, the nanofibers were made by electrospinning device and the topography and roughness coefficient of the nanofibers were obtained by atomic force microscopy (AFM). A tensile test was used to evaluate the mechanical properties of the nanofibers and simultaneous thermal analysis (STA) was used for thermal testing. The results of AFM showed nanofiber deformation in the combination of AV-phages. It was observed in the mechanical test results that with the addition of phage to AV-nanofibers, although the elastic module decreased, the elongation percentage increased, with high resistance to stretching. Also, the thermal analysis results were such that the addition of phage to AV-nanofibers increased the thermal stability of the nanofibers. The addition of MRSA phages to the Aloe vera nanofibers was increased thermal stability and the percentage of elongation of the nanofibers. The combination of AV-phage nanofibers creates a new carrying capacity at the nanofiber level to be a candidate for wound dressing as a therapeutic agent.

scholarly journals Friction and wear of nanocomposite Al2O3 + G processed by spark plasma sintering

2018 ◽  
Vol 84 (6) ◽  
pp. 52-58
Author(s):  
V. V. Stolyarov ◽  
A. A. Misochenko ◽  
E. G. Grigoriev ◽  
A. G. Zholnin ◽  
E. A. Klyatskina
Keyword(s):  
Thermal Stability ◽  
Friction And Wear ◽  
Structural Characteristics ◽  
Ultrasonic Dispersion ◽  
Elastic Module ◽  
Carbon Modification ◽  
Plasma Sintering ◽  
Thin Foils ◽  
Viscous Shear ◽  
The Coefficient Of Friction

The effect of allotropic carbon modification content, graphene (G), in the range of 0.5 – 2.0 wt.% on tribological, strength and structural characteristics of Al2O3/G nanocomposite processed by 10-min plasma spark sintering (pressure 50 MPa, temperature 1550 °C) of nanopowder mixture previously subjected to ultrasonic dispersion in organic solvent is studied. The results of tests for friction and wear without lubricant on a tribometer under a load of 20 N at room temperature and roundabout motion of a ruby ball penetrator on a disk are presented along with data on kinetic indentation with determination of the nanohardness and elastic module and observations of the fracture surface structure and friction track using a scanning microscope. Methods of the transmission electron microscopy of thin foils in dark and bright fields and Raman spectroscopy, respectively, were used to determine the microstructure in the bulk of a nanocomposite and prove the graphene thermal stability during plasma spark sintering. It is shown that introduction of graphene contributes to the increase of micro- and nanohardness, elastic modulus, wear resistance by two or three orders of magnitude and a slight decrease in the coefficient of friction. Increase in graphene content to 2 wt.% changes the wear mechanism from brittle breakage to viscous shear due to strengthening in coupling of matrix grains and presnrce of agglomerates. Lack of degradation and retention of graphene thermal stability are proved. The morphology of graphene particles indicates to their preferential arrangement inside the corundum grains and more rarely — on the grain boundaries.

scholarly journals A Characterization Study of Morphology and Properties of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH)/Aloe Vera Fibers Biocomposites: Effect of Fiber Surface Treatments

Proceedings ◽  
2020 ◽  
Vol 69 (1) ◽  
pp. 38
Author(s):  
Celia Idres ◽  
Mustapha Kaci ◽  
Nadjet Dehouche ◽  
Idris Zembouai ◽  
Stéphane Bruzaud
Keyword(s):  
Thermal Stability ◽  
Surface Morphology ◽  
Water Absorption ◽  
Loss Modulus ◽  
Aloe Vera ◽  
Fiber Surface ◽  
Complex Viscosity ◽  
Absorption Capacity ◽  
Characterization Study ◽  
Efficient Route

This paper aims to investigate the effect of different chemical modifications of biocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) and aloe vera bio-fibers incorporated at 20 wt%. The fiber surface was modified with alkaline, organosilanes, and combined alkaline/organosilanes. Surface morphology, thermal stability, water absorption capacity, and rheological behavior of the modified biocomposite materials were studied, and the results compared to both unmodified biocomposites and neat PHBH. The study showed that the modified biocomposites with both alkaline and organosilanes exhibited an improved surface morphology, resulting in a good fiber/matrix interfacial adhesion. As a result, increases in complex viscosity, storage modulus, and loss modulus were observed, whereas water absorption was reduced. Thermal stability remained almost unchanged, with the exception of the biocomposite treated with alkaline, where this property decreased significantly. Finally, the coupling of alkaline and organosilane modification is an efficient route to enhance the properties of PHBH biocomposites.

Organic solvent-free synthesis of phosphorus-containing polymers

2007 ◽  
Vol 79 (11) ◽  
pp. 1879-1884 ◽  
Author(s):  
Smaranda Iliescu ◽  
Gheorghe Ilia ◽  
Aurelia Pascariu ◽  
Adriana Popa ◽  
Nicoleta Plesu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Bisphenol A ◽  
Organic Solvent ◽  
Molar Mass ◽  
Interfacial Polycondensation ◽  
H Nmr ◽  
Phosphorus Containing ◽  
Solvent Free Synthesis ◽  
Thermal Stability Of

Direct, efficient, organic solvent- and catalyst-free synthesis of a series of polyphosphates was accomplished. The reaction involved a gas-liquid interfacial polycondensation between arylphosphoric dichlorides and bisphenol A. The polyphosphates were characterized by IR, 1H NMR, 31P NMR, inherent viscosity, thermal analysis, and molar mass. Yields in the range 70-90 % and inherent viscosities in the range 0.30-0.40 dl/g were obtained. The thermal stability of the polyphosphates was investigated by using thermogravimetry.

Sign in / Sign up

Export Citation Format

Share Document