A+ 무기화학실험 <exp9. Synthesis of highly uniform 400nm silica spheres> 레포트

A+ 무기화학실험 레포트

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1. Silica

Silica는 silicon dioxide를 뜻하며, 화학식은 SiO2∙ nH2O이다. Sulfuric acid와 sodium silicate가 반응하여 만들어지며, Si를 중심원자로 가지고 4개의 산소 원자가 Si 주변에 결합된 tetrahedral 구조를 갖는다. Silica의 산소 원자에 새로운 Si가 공유 결합하면서 3D network 구조를 형성하며, 그 종류에는 α-quartz, α-tridymite, β-tridymite 등이 있다. 이 중 α-quartz의 안정성이 가장 높기 때문에 해당 구조가 가장 흔히 관찰된다. Si-O 결합의 결합길이는 약 154~171pm이며, 결합각은 약 140~180°이나, silica의 구조에 따라 달라질 수 있다. Silica는 그물 구조를 가진 silicate로, 체적의 약 50%가 구멍으로 이루어져 있어 크기에 비하여 매우 넓은 표면적을 가진다. 이러한 특성으로 인하여 silica는 다양한 물질을 내부 구멍에 흡착시킬 수 있다.
2. Silica synthesis

고전적인 silica 연구는 1956년, Kolbe가 silicon alkoxide와 short chain alcohol을 가수분해와 condensation polymerization을 거쳐 non-porous 한 silica particle을 합성하면서 시작되었다.

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1. Silica

Silica is a naturally occurring mineral compound composed of silicon and oxygen. It is one of the most abundant elements on Earth and plays a crucial role in various industries and applications. Silica has a wide range of uses, including in the production of glass, ceramics, abrasives, and as a filler in rubber and plastics. It is also used in the production of computer chips and other electronic components, as well as in the construction industry as a key ingredient in concrete and cement. Silica's unique properties, such as its high melting point, chemical stability, and ability to form a variety of structures, make it a valuable and versatile material. Understanding the properties and applications of silica is essential for advancing various technological and industrial advancements.
2. Silica synthesis

Silica synthesis is the process of producing silica from various raw materials, such as sand, quartz, or other silicon-containing compounds. This process is essential for the production of a wide range of silica-based materials and products. The synthesis of silica can be achieved through various methods, including chemical precipitation, sol-gel processing, and hydrothermal synthesis. Each method has its own advantages and is suitable for different applications. For example, chemical precipitation is often used to produce precipitated silica for use in rubber and plastic reinforcement, while sol-gel processing is commonly used to produce high-purity silica for optical and electronic applications. Hydrothermal synthesis, on the other hand, is used to produce silica nanoparticles and other specialized silica materials. The development of efficient and cost-effective silica synthesis techniques is crucial for meeting the growing demand for silica-based products in various industries, such as construction, electronics, and healthcare. Continuous research and innovation in silica synthesis are essential for expanding the applications and improving the performance of silica-based materials.