MICROSTRUCTURE OF NANOSILICA MODIFIED BINDER BY ATOMIC FORCE MICROSCOPY

2016 ◽  
Vol 78 (7-3) ◽  
Author(s):  
Ahmad Kamil Arshad ◽  
Mohamad Saifullah Samsudin ◽  
Juraidah Ahmad ◽  
Khairil Azman Masri
Keyword(s):  
Atomic Force Microscopy ◽  
Physical Properties ◽  
Asphalt Binder ◽  
Visual Evaluation ◽  
Force Microscopy ◽  
Atomic Force ◽  
Surface Stiffness ◽  
Before And After ◽  
Modified Binder ◽  
Temperature Susceptibility

In this paper, the effect of nanosilica (NS) on the physical properties as well as aging on the morphology of asphalt binder was investigated. Asphalt binder penetration grade 60/70 (PEN 60/70) was modified with NS at concentrations of 1% to 5% by weight of binder. Scanning electron microscopy (SEM) was used to have a visual evaluation of Nanosilica dispersion. The physical properties tested include is softening point, penetration, ductility, viscosity and storage stability. Temperature susceptibility was evaluated using penetration index (PI) and penetration viscosity number (PVN). Nanosilica modified binder (NSMB) were aged using the rolling thin film oven test (RTFO) and pressure aging vessel (PAV). The morphology of the virgin asphalt binder and NSMB before and after aging was characterized by tapping mode atomic force microscopy (AFM). From the physical properties test, the addition of NS was found to improve the asphalt binder properties and can resist high temperature susceptibility. The results of the AFM imaging showed that the addition of nanosilica in asphalt binder improved its surface stiffness. The overall surface stiffness of the asphalt binder after aging also increased. It can be concluded from this study that 2% to 4% of NS gave the optimum performance for the binder.

In Operando Detection of the Physical Properties Change of the Interfacial Electrolyte during Li-Metal Electrode Reaction by Atomic Force Microscopy

2020 ◽  
Author(s):  
Mitsunori Kitta
Keyword(s):  
Atomic Force Microscopy ◽  
Energy Dissipation ◽  
Physical Properties ◽  
Electrode Surface ◽  
Electrode Reaction ◽  
Metal Electrode ◽  
Ion Concentration ◽  
Force Microscopy ◽  
Atomic Force ◽  
Discharge Reaction

This manuscript propose the operando detection technique of the physical properties change of electrolyte during Li-metal battery operation.The physical properties of electrolyte solution such as viscosity (η) and mass densities (ρ) highly affect the feature of electrochemical Li-metal deposition on the Li-metal electrode surface. Therefore, the operando technique for detection these properties change near the electrode surface is highly needed to investigate the true reaction of Li-metal electrode. Here, this study proved that one of the atomic force microscopy based analysis, energy dissipation analysis of cantilever during force curve motion, was really promising for the direct investigation of that. The solution drag of electrolyte, which is controlled by the physical properties, is directly concern the energy dissipation of cantilever motion. In the experiment, increasing the energy dissipation was really observed during the Li-metal dissolution (discharge) reaction, understanding as the increment of η and ρ of electrolyte via increasing of Li-ion concentration. Further, the dissipation energy change was well synchronized to the charge-discharge reaction of Li-metal electrode.This study is the first report for direct observation of the physical properties change of electrolyte on Li-metal electrode reaction, and proposed technique should be widely interesting to the basic interfacial electrochemistry, fundamental researches of solid-liquid interface, as well as the battery researches.

Characterization of X-ray irradiated graphene oxide coatings using X-ray diffraction, X-ray photoelectron spectroscopy, and atomic force microscopy

2013 ◽  
Vol 28 (2) ◽  
pp. 68-71 ◽  
Author(s):  
Thomas N. Blanton ◽  
Debasis Majumdar
Keyword(s):  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
High Energy ◽  
X Ray Diffraction ◽  
Carbon Phase ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After

In an effort to study an alternative approach to make graphene from graphene oxide (GO), exposure of GO to high-energy X-ray radiation has been performed. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) have been used to characterize GO before and after irradiation. Results indicate that GO exposed to high-energy radiation is converted to an amorphous carbon phase that is conductive.

Protective Coating Based on Organic Silicon Polymer of Ladder Structure Nanostructured with Alkoxysilane

2020 ◽  
Vol 992 ◽  
pp. 580-584
Author(s):  
V.Yu. Chukhlanov ◽  
O.G. Selivanov ◽  
N.V. Chukhlanova
Keyword(s):  
Atomic Force Microscopy ◽  
Physical Properties ◽  
Protective Coating ◽  
Silicon Oxide ◽  
Polymer Composition ◽  
Orthosilicic Acid ◽  
Force Microscopy ◽  
Atomic Force ◽  
Destruction Kinetics ◽  
The Impact

New materials based on oligooxidridsilmethylensiloxysilane nanostructured with ethyl ester of orthosilicic acid – tetraethoxysilane have been studied in the research. Tetraethoxysilane introduction into the composition is supposed to cause its decomposition up to nanoparticles of silicon oxide. The alkoxysilane hydrolytic destruction kinetics and the impact of the composition and nature of the polymer composition components on the physical properties have been studied. Atomic force microscopy was used to study the structurization kinetics of the polymer composition. The composition hydrophobicity was determined by the edge wetting angle. To study the adhesion characteristics of the obtained material, the method of disc separation from the substrate has been used. The relative rigidity has been determined by a pendulum device M3. Atomic force microscopy revealed the presence of nanoscale neoplasms (at average of one hundred twenty per one square micrometer) in diameter from two to five nanometers in the surface structure of the composition, modified with tetraethoxysilane. Herewith the physical properties of the material change: rigidity increases, the edge angle of wetting increases as well. The studied nanostructured compositions can also be applied. For example – they can be used as a protective coating with a set of special properties, such as high hydrophobicity.

AFM Study of Untreated and Treated Fibers of Mongolian Goat Cashmere

2009 ◽  
Vol 610-613 ◽  
pp. 175-178 ◽  
Author(s):  
Namsrai Javkhlantugs ◽  
Enkhbaatar Ankhbayar ◽  
Khishigjargal Tegshjargal ◽  
Damdin Enkhjargal ◽  
Chimed Ganzorig
Keyword(s):  
Surface Roughness ◽  
Atomic Force Microscopy ◽  
Fine Structure ◽  
Ambient Conditions ◽  
Bleaching Process ◽  
Surface Change ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After ◽  
The Difference

The morphological surface change of untreated and treated fibers of the Mongolian goat cashmere was investigated by atomic force microscopy (AFM) at ambient conditions. The cuticle scale heights of the Mongolian goat cashmere fibers were measured by the AFM for the fibers before and after treatment. The experimental results showed that the difference between the fine structure of the cuticle and surface roughness of untreated and treated fibers. We found that the surface morphological change of the cashmere fibers was strongly degraded after the bleaching process.

scholarly journals Atomic Force Microscopy Study of the Effect of Antimicrobial Peptides on the Cell Envelope of Escherichia coli

2005 ◽  
Vol 49 (10) ◽  
pp. 4085-4092 ◽  
Author(s):  
M. Meincken ◽  
D. L. Holroyd ◽  
M. Rautenbach
Keyword(s):  
Escherichia Coli ◽  
Atomic Force Microscopy ◽  
Morphological Changes ◽  
Cell Envelope ◽  
Microscopy Study ◽  
Target Cells ◽  
Force Microscopy ◽  
E Coli ◽  
Atomic Force ◽  
Before And After

ABSTRACT The influences of the antibacterial magainin 2 and PGLa from the African clawed frog (Xenopus laevis) and the hemolytic bee venom melittin on Escherichia coli as the target cell were studied by atomic force microscopy (AFM). Nanometer-scale images of the effects of the peptides on this gram-negative bacterium's cell envelope were obtained in situ without the use of fixing agents. These high-resolution AFM images of the surviving and intact target cells before and after peptide treatment showed distinct changes in cell envelope morphology as a consequence of peptide action. Although all three peptides are lytic to E. coli, it is clear from this AFM study that each peptide causes distinct morphological changes in the outer membrane and in some cases the inner membrane, probably as a consequence of different mechanisms of action.

scholarly journals Effect of at-home bleaching with different thickeners and aging on physical properties of a nanocomposite

2016 ◽  
Vol 10 (01) ◽  
pp. 082-091 ◽  
Author(s):  
Thayla Hellen Nunes Gouveia ◽  
Juliana do Carmo Públio ◽  
Glaucia Maria Bovi Ambrosano ◽  
Luís Alexandre Maffei Sartini Paulillo ◽  
Flávio Henrique Baggio Aguiar ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Physical Properties ◽  
Aging Process ◽  
Artificial Aging ◽  
Organic Matrix ◽  
Carbamide Peroxide ◽  
Treatment Control ◽  
Force Microscopy ◽  
Atomic Force ◽  
Knoop Microhardness

ABSTRACT Objective: To evaluate the influence of 16% carbamide peroxide (CP) containing different thickeners on the physical characteristics of a nanocomposite resin submitted or not to accelerated artificial aging (AAA). Materials and Methods: One hundred samples were randomly distributed into two groups (n = 50) according to AAA. Each group was divided into 5 subgroups (n = 10) depending on the bleaching/thickener treatment: CP + carbopol, CP + natrosol, carbopol, natrosol, and no treatment (control). The physical properties tested were color (ΔE), gloss (GU), mean roughness (Ra), and Knoop microhardness (KHN). The resin surface was performed with atomic force microscopy (AFM). Statistical Analysis: The color (variable Δ E) was assessed with two-way analysis of variance (ANOVA) and additionally with Tukey's and Dunnett's tests, the roughness values were submitted to Kruskal–Wallis, Dunn's, and Mann–Whitney's tests. Data on gloss and KHN were submitted to two-way ANOVA and Tukey's test (α = 0.05). Results: Among the physical properties evaluated, CP + carbopol promoted a reduction in composite microhardness only, thus differing statistically from the controls. As for CP + natrosol, such a change was not observed. The aging process reduced all the physical properties, thus differing statistically from the nonaging group. CP + carbopol increased the roughness and decreased the gloss of aged resins, whereas natrosol reduced gloss only, which differed statistically from the controls. Conclusions: AFM showed evidence of the loss of organic matrix and exposure to load particles in the aged samples. Therefore, the replacement of carbopol with natrosol provided maintenance of the composite microhardness following bleaching. The aging process reduced the physical properties evaluated, and some changes were enhanced by the application of bleaching.

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