Masters Dissertations : Engineering Technology Industrieshttps://repository.sustech.edu/handle/123456789/204902024-03-29T03:03:40Z2024-03-29T03:03:40ZEnhancement of Vehicle Airbag Nylon 66 Fabric Properties Coated with PVA/Silica Nanoparticles CompositeAli, Salma Zakaria SalmanSupervisor, -Hasabo Abdelbagi Mohamed Ahmedhttps://repository.sustech.edu/handle/123456789/276992022-10-20T08:10:14Z2019-05-12T00:00:00ZEnhancement of Vehicle Airbag Nylon 66 Fabric Properties Coated with PVA/Silica Nanoparticles Composite
Ali, Salma Zakaria Salman; Supervisor, -Hasabo Abdelbagi Mohamed Ahmed
The vehicle airbags are safety systems used to cushion the driver or passenger
during a collision and reduce bodily injuries. Airbags are typically made from
woven fabric, which may be coated or uncoated fabric. In this research nylon 66
fabric was Coated with composite of polyvinyl alcohol (PVA) and different
concentration of silica (SiO2) nanoparticles. The fabrics were characterized by
different instruments such as Scanning Electron Microscopy (SEM), Fourier
Transform Infrared (FTIR) Spectroscopy, Differential Scanning Calorimeter
(DSC),Thermogravimetric Analysis (TGA), Water Contact Angle (WCA), Tensile
Strength Tester and Airpermeability Tester. Nylon 66 fabric was coated with PVA
and higher concentration of silica nanoparticles has a thin layer thickness rechead
to (0.009mm). Moreover, the final dry weight of the coating (PVA/SiO2) material
taken by the nylon 66 fabric is 0.4 gram per square meter. The thermal properties
of nylon 66 coated with PVA/SiO2 nanoparticles has been improved, including
better mechanical properties according to commercial guidelines airbag (FMVSS).
Nylon 66 fabric coated with PVA/SiO2 nanoparticles demonstrated the a
hydrophobicity property. The airpermeability has decreased by increasing the
amount of silica nanoparticles in the composite material.
Thesis
2019-05-12T00:00:00ZHydrophobicity of Cotton Fabric Treated With Silica NanoparticlesHassan, Rahma Adam AissaSupervisor, -HasaboAbdelbagi Mohamed Ahmedhttps://repository.sustech.edu/handle/123456789/274372022-08-28T12:44:37Z2021-11-22T00:00:00ZHydrophobicity of Cotton Fabric Treated With Silica Nanoparticles
Hassan, Rahma Adam Aissa; Supervisor, -HasaboAbdelbagi Mohamed Ahmed
To obtain the hydrophobicity cotton fabrics, cotton fabrics were treated with silica nanoparticles and/or accost effective Water Repellent agent (WR agent).Two different silica nanoparticles were synthesized via a sol–gel process and their shapes, sizes, and compositions were characterized. It was found that silica particles are spherical and have diameters of 150 and 300nm.
For the cotton fabrics treated with the WR agent alone the water contact angles on the fabric surface remained lower than 20°approximately at the WR agent concentration of 0.3wt% or less.
Silica nanoparticle treatment itself did not change the hydrophilic surface of cotton fabric indicating that water drops were absorbed into fabrics due to the hydroxyl groups on both cotton and silica nanoparticle surfaces.
However for the cotton fabrics treated with both silica nanoparticles and the WR agent a contact angle above 105°can be obtained even at the very low WR agent concentration of 0.1wt%.
Therefore,hydrophobic cotton fabrics could be obtained the combined treatment of silica nanoparticle and WR agent, which is cost effective com-pared with fluorinate silane treatment.
Keywords — Hydrophobicity cotton, silica nanoparticles, water Repellent (WR), Contact Angle (CA).
Thesis
2021-11-22T00:00:00ZA Sustainable Approach to Reduce Environmental Threats of Oxidative Degradation of Plastic FilmsAhmed, Samah Suliman Alhaj MohammedSupervisor, -Mohamed Deen Hussein Mohammedhttps://repository.sustech.edu/handle/123456789/273252022-05-11T06:37:28Z2021-12-29T00:00:00ZA Sustainable Approach to Reduce Environmental Threats of Oxidative Degradation of Plastic Films
Ahmed, Samah Suliman Alhaj Mohammed; Supervisor, -Mohamed Deen Hussein Mohammed
Plastic pollution of the environment is a serious since the plastics production worldwide now is about 400 million tons. Many items of plastics products cannot be collected in order to recycle. The recycled plastics is less than 9%. It takes very long time degrades in the soil about one hundred year. Polyethylene is the most widely used plastic in the world. The major product of polyethylene is the films which is difficult collect after being used therefore it is a major pollutant to the environment.
For many decades the scientists are searching for method to degrade specially PE films. The researches are carried into chemical and biological routes and some other researches to replace PE with another plastic that degrade easily in nature. The fruit of these researches is to add small amount of transitional metal organic salt can lead to the degradation of PE in a short time. The most effective metals found are manganese and cobalt. Many materials has been introduced in this field. To judge upon suitability of these products ASTM D6954 and BS 8472 are issued. It verify that the product is suitable for food contact and does not affect the recycling if carried.
Thesis
2021-12-29T00:00:00ZGreen Synthesis of Silver Nano-particles by Using Fenugreek Seeds Extract and Application as Antifungal AgentElsiddig, Eiman Seif Eldeen HassanSupervisor, -Hasabo Abdelbagi Mohamed Ahmedhttps://repository.sustech.edu/handle/123456789/271572022-04-11T07:37:25Z2022-03-12T00:00:00ZGreen Synthesis of Silver Nano-particles by Using Fenugreek Seeds Extract and Application as Antifungal Agent
Elsiddig, Eiman Seif Eldeen Hassan; Supervisor, -Hasabo Abdelbagi Mohamed Ahmed
Recently, researchers turned to green and environmentally friendly ways to prepare nanoparticles, due to the safety of the environment and low cost. This research aims to synthesize silver Nano-particles to be used as an antifungal for Candida Albicans. This fungus causes diaper rash in children and vaginal infections in women. Silver nanoparticles were synthesized using an aqueous solution of fenugreek seed Trigonella Foenum-graecum extract, the plant extract acts as a reducing and stabilizing agent. Fenugreek extract was mixed with three concentrations of silver nitrate solution to obtain silver nanoparticles, which were characterized by scanning electron microscopy. The scanning electron microscope image showed nanoparticles in the nano-meter size range. These particles were used to examine the antifungal activity using the paper disc diffusion method and showed a clear effect on Candida Albicans.
Thesis
2022-03-12T00:00:00Z