Global Materials Science: Coltan, Polymers, and Nanotechnology Innovations

Coltan: Price and Applications of Raw Materials

Coltan is the abbreviation for Columbite and Tantalite. These minerals are found in certain granites and yield Niobium and Tantalum.

• Niobium: Used in manufacturing high-power magnetic alloys, crucial for the development of micromotors, and utilized in components like hard drives, headphones, and powerful, precise speakers.
• Tantalum: Essential for the fabrication of capacitors present in batteries.

Understanding Plastics and Polymerization

Plastics possess plasticity, a property that allows materials to be easily formed and shaped. The formation of plastic molecules, known as polymers, is quite complex. However, we can describe the process as the union of a large number of small molecules, called monomers or nanomers, which may or may not be identical.

The process where we take several simple molecules and unite them to form a large chain structure is called polymerization.

Paper Production: Environmental Challenges and Solutions

Paper relies on obtaining cellulose, a natural fiber derived from trees with exceptional characteristics regarding flexibility and the ability to bind sheets together.

Environmental Problems Associated with Paper Production

• Deforestation: Caused by the indiscriminate logging of trees.
• Water Consumption: The huge amount of water necessary for the phase separation of cellulose from lignin.
• Pollution: Contamination of rivers due to the use of sulfur compounds.
• Energy Use: The energy required to operate the machinery.

Sustainable Solutions for Paper Manufacturing

• Deforestation Control: Addressed through the chain of custody.
• Water Management: Closed-loop cycling can be used, extracting chemicals from wastewater, and returning the treated water to the industrial manufacturing process.
• Energy Reduction: Achieved by recycling more paper.

Nanoscience and the Atomic World

Nanoscience is the study of all aspects at the nanometer scale. Thanks to the new Scanning Tunneling Microscope, scientists can see atoms and substances and use them to fabricate machines with atomic-sized pieces, which are smaller than cells themselves.

Carbon Structures and Nanoscale Applications

In the world of carbon, when several carbon atoms are joined, they form crystal lattices. The properties vary according to the crystalline form—that is, based on how the atoms are linked.

A key application at the nanoscale is the Fullerene, a molecule composed of 60 carbon atoms (C₆₀). Its structure is very peculiar, as it can take the form of a ball, similar to a football.

Carbon structures may also take the form of a pipe, known as a nanotube, which has many applications. If composed of elements like boron, it can become a conductor. In this case, we would be talking about nanocables, or if it acts as a semiconductor, we would be talking about nanoswitches (nanointerruptores).

Defining Nanotechnology: Applied Multidisciplinary Science

NANOTECHNOLOGY is an applied science that addresses the design, manufacture, and fabrication of materials and equipment at the nanometric scale. Nanotechnology is a multidisciplinary science that covers all imaginable scientific fields and future creations.