As part of a series of lectures of Mother Syria Assembly MSA specialized scientific course on Hi-tech, in cooperation with Damascus Branch of the Engineers Union., Dr. Mustafa Eleoui delivered a lecture entitled “nano- manufacturing ” in the presence of MSA President Dr. Mahmoud al-Irk , MSA members and an elite group of Specialized researchers …
Eleoui pointed out that nanomaterials are micro-chemicals used in high quality in many industrial applications such as telecommunications, electronics and medical fields because they contain many physical and chemical properties. They are prepared in several ways, all of which are adopted by atomic scale, And the different size scale of the mass of the material, the different the chemical effectiveness, the smaller the chemical effect of the material.
Dr. Eleoui said that nanotechnology manufacturing is transforming raw materials into products with specific properties and specific performance, adding that a nanostructure is a structure of intermediate size between microscopic and molecular structures. Nanostructural detail is microstructure at nanoscale.
In describing nanostructures, he added it is necessary to differentiate between the number of dimensions in the volume of an object which are on the nanoscale. Nanotextured surfaces have one dimension on the nanoscale, i.e., only the thickness of the surface of an object is between 0.1 and 100 nm. Nanotubes have two dimensions on the nanoscale, i.e., the diameter of the tube is between 0.1 and 100 nm; its length can be far more. Finally, spherical nanoparticles have three dimensions on the nanoscale, i.e., the particle is between 0.1 and 100 nm in each spatial dimension. The terms nanoparticles and ultrafine particles (UFP) are often used synonymously although UFP can reach into the micrometre range.
Speaking about processes used for bottom-up manufacturing, Dr. Eleoui said that methods to produce nanoparticles from atoms are chemical processes based on transformations in solution e.g. sol-gel processing, chemical vapour deposition (CVD), plasma or flame spraying synthesis, laser pyrolysis, atomic or molecular condensation. These chemical processes rely on the availability of appropriate “metal-organic” molecules as precursors. Sol-gel processing differs from other chemical processes due to its relatively low processing temperature. This makes the sol-gel process cost-effective and versatile. In spraying processes the flow of reactants (gas, liquid in form of aerosols or mixtures of both) is introduced to high-energy flame produced for example by plasma spraying equipment or carbon dioxide laser. The reactants decompose and particles are formed in a flame by homogeneous nucleation and growth. Rapid cooling results in formation of nanoscale particles.
At the end of the lecture, Dr. Eleoui answered all the questions posed by the attendees regarding the employment of nanotechnology locally, saying that it is used in some industries, although it is still under instant research and inspection .