Silicon
[CAS# 7440-21-3]

Identification

• Classification: Inorganic chemical industry >> Simple substance
• Name: Silicon
• Synonyms: Silicone; Silicon powder
• Molecular Formula: Si
• Molecular Weight: 28.08
• CAS Registry Number: 7440-21-3 (90337-93-2)
• EC Number: 231-130-8
• SMILES: [Si]

Properties

• Density: 2.33
• Melting point: 1410 ºC
• Boiling point: 2355 ºC
• Water solubility: INSOLUBLE

Safety Data

• Hazard Symbols: GHS02 Warning
• Hazard Statements: H228
• Precautionary Statements: P210-P240-P241-P280-P370+P378

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Flammable solids	Flam. Sol.	2	H228
Eye irritation	Eye Irrit.	2	H319
Flammable solids	Flam. Sol.	1	H228
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - repeated exposure	STOT RE	2	H373
Specific target organ toxicity - single exposure	STOT SE	3	H335

Discovory and Applicatios

Silicon is a chemical element with the symbol Si and atomic number 14. It is a metalloid, meaning it has properties of both metals and non-metals. Silicon is the second most abundant element in the Earth's crust, making up approximately 27.7% by weight. It is found primarily in the form of silicon dioxide (SiO2) or silicates, such as in sand, quartz, and various minerals. Silicon's discovery and its subsequent applications have been critical in advancing modern technology, particularly in the fields of electronics and materials science.

The discovery of silicon dates back to the early 19th century. The element was first isolated in 1824 by the Swedish chemist Jöns Jacob Berzelius, who used a process involving the reduction of silicon tetrafluoride (SiF4) with potassium. Prior to this, silicon compounds were known but had not been identified as the element itself. Berzelius' work laid the foundation for the study of silicon, though it would take several decades before its full potential would be realized.

The most significant application of silicon is in the field of electronics. Silicon plays a pivotal role in the development of semiconductors, which are the fundamental components of modern electronic devices such as computers, smartphones, and solar cells. The discovery of silicon's semiconducting properties revolutionized the electronics industry. Silicon is used to create transistors, diodes, and integrated circuits, which are the building blocks of virtually all electronic devices. Its ability to conduct electricity under certain conditions, while acting as an insulator under others, allows it to control electrical signals in a wide range of applications.

The development of the silicon-based transistor in the 1940s and 1950s marked the beginning of the modern electronics age. This advancement led to the creation of smaller, more efficient, and more affordable electronic devices, particularly with the advent of the microprocessor in the 1970s. Silicon microchips have enabled the miniaturization of electronics, leading to innovations in computing, telecommunications, and entertainment technologies.

Another critical application of silicon is in the production of solar cells. Silicon-based photovoltaic cells are the most widely used type of solar cells in the world today. These cells convert sunlight into electricity by exploiting the photovoltaic effect, a process in which silicon absorbs photons and generates an electrical current. The efficiency and relatively low cost of silicon-based solar cells have made them a key technology in the transition to renewable energy sources. As global demand for clean energy increases, the role of silicon in the production of solar energy is expected to continue growing.

In addition to its electronic and energy applications, silicon is widely used in the construction industry. Silicon dioxide, or silica, is a key component of cement, concrete, and glass, which are essential materials in the building sector. Silica is also used in the production of ceramics, where it contributes to the durability and heat resistance of various products. Silicon compounds, such as silicones, are used in a wide range of consumer goods, including lubricants, adhesives, sealants, and medical devices. Silicones are known for their flexibility, resistance to high temperatures, and water-repellent properties, making them highly versatile in industrial applications.

In recent years, research into advanced materials has led to the development of silicon-based compounds for use in a variety of high-tech applications. For example, silicon carbide (SiC) is a semiconductor material that exhibits remarkable strength, thermal stability, and electrical conductivity. Silicon carbide is used in high-power electronics, such as electric vehicle charging systems and power conversion devices, due to its ability to operate at higher temperatures and voltages than traditional silicon-based devices. Additionally, silicon nanomaterials are being explored for use in areas such as drug delivery systems, high-performance batteries, and advanced coatings.

Despite its many applications, silicon does have limitations. For instance, while silicon is an excellent material for electronics, it is not ideal for certain high-frequency or high-power applications, which has led to the development of alternative semiconductors, such as gallium nitride (GaN) and gallium arsenide (GaAs). Nonetheless, silicon remains the dominant material in the semiconductor industry, with research continually aimed at improving its performance and expanding its applications.

The discovery of silicon and its applications have had a profound impact on technology and industry. Its versatility in electronics, renewable energy, construction, and consumer goods underscores its importance in modern life. As advancements in materials science continue, silicon will undoubtedly remain a central element in shaping the technologies of the future.

References

1971. Hemolysis by asbestos. Environmental Research, 4(1).
DOI: 10.1016/0013-9351(71)90038-7

2024. Effects of Silicon Concentration and Synthesis Duration on Lignin Structure: A Spectroscopic and Microscopic Study. Biopolymers.
DOI: 10.1002/bip.23640

1984. Silicon compounds as substrates and inhibitors of acetylcholinesterase. Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, 790(3).
DOI: 10.1016/0167-4838(84)90020-7