Study on Enhancement of Adhesion Force and Surface Conductivity of Graphene Oxide Films using Different Solvents | Chapter 6 | Recent Trends in Chemical and Material Sciences Vol. 1

 The nanotechnology approach was used to improve the adhesion force as well as the surface properties of graphene oxide (GO) films in this study. By employing a modified Hummer's process to oxidise pure graphite, GO has been created in powder form. Several types of solvents were used to deposit different films of GO nanoparticles (NPs), including distilled water, acetone, ethanol, dimethylformamide (DMF), and ethylene glycol. XRD and UV–vis absorption spectroscopy were used to investigate the structural and optical characteristics of GO films. Electrical properties, surface roughness, contact angle, adhesion force, wetting energy, and spreading coefficient were all looked into. The solvent type has an effect on the qualities of the produced films, it has been discovered. The electrical resistivity of films is strongly dependent on the solvent type, with distilled water having the lowest value. Furthermore, the adhesion force and average surface roughness (Ra) of GO films synthesised with distilled water are 143.4 mN/m and 7.83 m, respectively. These findings are linked to the agglomeration of hydrophilic cites and GO NPs on the surface of films, as well as the effects of their size on surface roughness expansion.

Author (s) Details

M. Abdelhamid Shahat
PV Unit, Solar and Space Research Department, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt.

Ahmed Ghitas
PV Unit, Solar and Space Research Department, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt.

F. M. El-Hossary
Physics Department, Faculty of Science, Sohag University, Sohag, Egypt.

A. M. Abd El-Rahman
Physics Department, Faculty of Science, Sohag University, Sohag, Egypt and King Abdul Aziz University, Jeddah, KSA.

Mohammed H. Fawey
Physics Department, Faculty of Science, Sohag University, Sohag, Egypt.

View Book :- https://stm.bookpi.org/RTCAMS-V1/article/view/2183

Study of Contact Parameters in Metal-on-plastic Hip Endoprothesis with a New Analytical Method of Contact Mechanics | Book Publisher International

 The author presents a computational approach for estimating contact characteristics (i.e., maximum contact pressures, angle, and diameter of contact) in thermo-diffusion nitrided (TDN) Grade 2 and ultra-high molecular weight polyethylene hip prostheses (UHMWPE). The impact of hip joint stress, prosthesis head diameter, and radial clearance on the above contact parameters has been examined. The relationships between maximum contact pressures and the contact parameters given above are determined. A linear increase in contact pressure is caused by increasing radial clearance and endoprosthesis loading. However, when the head diameter grows, the contact pressure decreases in a non-linear manner. The contact diameter grows in lockstep with the head diameter. The Young's modulus of UHMWPE has been shown to vary by up to three times. As a result, the impact of Young's modulus and Poisson's ratio on the maximum contact pressure was investigated. The endoprosthesis with non-spherical surfaces of its elements was also examined using the approach (Alpharabola geometry). The impact of a head departure from sphericity in the shape of an oval on contact pressure, contact angle, and contact diameter was investigated. This geometry's beneficial properties were discovered.

Author(s) Details

Myron Chernets
Aerospace Faculty, National Aviation University, 03680 Kyiv, Ukraine.

Jaroslaw Zubrzycki
Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.

View Book:- https://stm.bookpi.org/SCPMHENAMCM/article/view/2747

Review on the Actively-Controlled Colloidal Dampers and Investigations on a Colloidal Damper Rendered Controllable under the Variable Magnetic Field Generated by Moving Permanent Magnets| Chapter 10 | Newest Updates in Physical Science Research Vol. 7

 Following a study of the operating principle of a colloidal damper rendered controllable (CDRC), this Chapter presents a review of different types of controlling devices and their sensitivity. The controllability of a new form of colloidal absorber, rendered controllable under varying magnetic fields, is then experimentally tested. This absorber is made up of a water-based ferrofluid (FERROTEC MSG-W10) and a liquid-repellent nanoporous solid body made up of gamma alumina and/or silica gel particles. Permanent neodymium annular magnets are positioned either on the piston head (axial magnetic field) or on the exterior surface of the cylinder to control the dynamic properties (radial magnetic field). The quantity of the displaced liquid by the magnets through the damper's filter and through the nanoporous solid body was estimated after flow visualisations inside a transparent model damper were done. The fluctuation of the magnetic flux density at the magnet surface with the magnet's height and versus the target distance was measured experimentally. The appropriate magnet geometry was chosen based on this information. The trial colloidal damper's three-dimensional structural model, created with Solidworks, and the excitation test rig are then shown. Excitation studies on a ball-screw shaker revealed that the proposed absorber had greater damping capacities than a standard colloidal damper, as well as the ability to modify the damping coefficient depending on the excitation type.

Author(s) Details

Barenten Suciu
Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka-shi, Fukuoka 811-0295 Japan.

View Book :- https://stm.bookpi.org/NUPSR-V7/article/view/1297

Review on the Actively-Controlled Colloidal Dampers and Investigations on a Colloidal Damper Rendered Controllable under the Variable Magnetic Field Generated by Moving Permanent Magnets| Chapter 10 | Newest Updates in Physical Science Research Vol. 7

 Following a study of the operating principle of a colloidal damper rendered controllable (CDRC), this Chapter presents a review of different types of controlling devices and their sensitivity. The controllability of a new form of colloidal absorber, rendered controllable under varying magnetic fields, is then experimentally tested. This absorber is made up of a water-based ferrofluid (FERROTEC MSG-W10) and a liquid-repellent nanoporous solid body made up of gamma alumina and/or silica gel particles. Permanent neodymium annular magnets are positioned either on the piston head (axial magnetic field) or on the exterior surface of the cylinder to control the dynamic properties (radial magnetic field). The quantity of the displaced liquid by the magnets through the damper's filter and through the nanoporous solid body was estimated after flow visualisations inside a transparent model damper were done. The fluctuation of the magnetic flux density at the magnet surface with the magnet's height and versus the target distance was measured experimentally. The appropriate magnet geometry was chosen based on this information. The trial colloidal damper's three-dimensional structural model, created with Solidworks, and the excitation test rig are then shown. Excitation studies on a ball-screw shaker revealed that the proposed absorber had greater damping capacities than a standard colloidal damper, as well as the ability to modify the damping coefficient depending on the excitation type.

Author(s) Details

Barenten Suciu
Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka-shi, Fukuoka 811-0295 Japan.

View Book :- https://stm.bookpi.org/NUPSR-V7/article/view/1297

Recent Advances on Superhydrophobic Coating Based on Silicone Resin SILRES® MSE 100 | Chapter 2 | Advanced Aspects of Engineering Research Vol. 8

 Coatings based on the developed mixture are evaluated for anti-icing capabilities. It was demonstrated that after 72 hours of wetting, the coatings based on the suggested composition preserved their superhydrophobic properties. On the mortar substrate, the wetting angle was greater than 150 degrees. Coating adhesion to the substrate after wetting was rated as 1 point. The findings of an evaluation of ice adhesion to a superhydrophobic metal surface are presented. The force of detachment of a drop of water on a superhydrophobic metal surface is proven to be three times less. Its anti-icing characteristics allow a drop of water to glide off the surface more easily. It has been demonstrated that ice adheres to a superhydrophobic surface less than a hydrophilic one. On a hydrophilic and superhydrophobic surface, there is no difference in the rate of ice evaporation. According to the research, the proposed composition generates a covering with anti-icing qualities that lasts in service.

Author (s) Details

V. I. Loganina
Penza State University of Architecture and Construction, Street Titov,28, 440028, Penza, Russia.

View Book :- https://stm.bookpi.org/AAER-V8/article/view/1097