What is Aerosil?

Have you ever heard of Aerosil? It is the well-known brand name for colloidal silica, which is actually amorphous nano-silica. Aerosil is found in the form of a very fine and light powder and is composed of nano-scale particles that lack a regular crystalline structure. These unique structural features have made Aerosil one of the most widely used additives in various industries. Aerosil, also known as Fumed Silica, Pyrogenic Silica, or Fumed Silicon Dioxide, is produced through a chemical process at very high temperatures and acts as a multipurpose additive.

Aerosil is produced in two main categories: hydrophilic and hydrophobic, each of which has its own specific applications:

• Hydrophilic Aerosil: This type is the same as unmodified silica and is divided into mixed oxides and silicon dioxide. Hydrophilic Aerosil, due to its nature, mixes easily with water.
• Hydrophobic Aerosil: To produce hydrophobic Aerosil, hydrophilic silica is chemically treated with silane, silazane or siloxane. This process creates a coating that greatly increases the Aerosil’s resistance to moisture and corrosion. For this reason, hydrophobic Aerosil is a good choice in formulations that require protection against moisture and rust.

Aerosil is available in two grades: Pharmaceutical Grade and Industrial Grade, each grade being suitable for specific uses depending on its purity and characteristics:

• Pharmaceutical Grade: This grade is produced with very high purity and complies with the strict standards of the pharmaceutical industry. It is used in the production of various medicines and supplements.
• Industrial Grade: Aerosil industrial grade is used in a wide range of industries. Among its most important applications are the paint and resin industries (as a thickening and anti-settling agent), plastics (to improve mechanical properties and dimensional stability), rubber (to increase strength and abrasion resistance), food (as an anti-caking and lubricant agent), and cosmetics (to create the right texture and stability of formulations).

Given its exceptional properties and the variety of grades available, Aerosil is recognized as a key raw material in many modern manufacturing processes. Choosing the right Aerosil grade depends on the specific needs of each industry and intended application.

History of Aerosil

Aerosil or fumed silica is a nanostructured material that was developed in the 1940s by the German company Degussa AG (now part of Evonik Industries). The company was looking for solutions to improve the mechanical and rheological properties of various products. In this regard, the process of producing fumed silica was invented through the hydrolysis of silicon tetrachloride (SiCl₄) vapor in a hydrogen and oxygen flame.

Key Stages in the History of Aerosil:

1. 1940s: Degussa AG developed the process for producing fumed silica. This material was first used as a thickening agent and improver of mechanical properties in rubbers and polymers.

2. 1950s and 1960s: Aerosil gradually gained attention in various industries such as paints, coatings, adhesives and pharmaceuticals. Its unique properties such as high specific surface area, thermal and chemical stability made it a special place in many industrial and commercial applications.

3. 1970s and 1980s: With the increase in knowledge and technology, different types of Aerosil with different properties and applications were produced. Hydrophilic and hydrophobic Aerosil were introduced to the market, each of which was used in its own fields.

4. 1990s to date: The continuous development and improvement of Aerosil production processes and quality continued. Today, Aerosil is used in a wide range of industries including cosmetics, pharmaceuticals, food, and electronics.

Since its inception in the 1940s by Degussa AG until today, Aerosil has been used as a vital material in many industries. The continuous development and improvement of the properties and applications of this material demonstrate its importance and impact in modern technologies and products.

Physical and Chemical Properties of Aerosil: A Deeper Look at This Amazing Powder

Aerosil, which is silicon dioxide (SiO2) with a special structure, is a multipurpose powder with outstanding physical and chemical properties. Here we briefly mention the most important of these properties:

– Physical properties of Aerosil

• Appearance: White powder, very light and fluffy.
• Chemical formula: SiO2.
• Particle size: Very small particles on the nanometer scale (5 to 50 nm).
• High specific surface area: Due to its porous structure and fine particles, it has a very large contact surface.
• Thermal stability: Excellent resistance to high temperatures.
• Solubility: Insoluble in water and most organic solvents.

– Chemical properties of Aerosil

• Surface hydroxyl groups: The surface of Aerosil particles has hydroxyl (-OH) groups that are responsible for its hydrophilic properties.
• Thickening and anti-settling: Increases the viscosity (thickness) of liquids and prevents the particles from settling. It is thick at rest and thins with stirring (thixotropic property).
• Anti-caking agent: In powders, it prevents them from sticking and caking by reducing friction between particles.
• Reinforcer: In combination with other materials (such as rubber), it improves their strength and mechanical resistance.
• Hydrophobicity (in modified form): By chemically modifying the surface, Aerosil can be made hydrophobic to increase moisture resistance.

These properties have made Aerosil a key additive in various industries.

Aerosil Applications

Aerosil (SiO₂) is used in a wide range of industries due to its ultra-light structure, high active surface area and unique rheological behavior. These applications include the following:

• Paint and coating industries: It is used as a thickener, antifouling and improver of coating properties. Aerosil increases resistance to abrasion and scratches and improves the stability of coatings.
• Plastics and rubber industries: It is used as a reinforcement in plastics and rubbers. This material increases strength and resistance to abrasion.
•  Pharmaceutical industries: It is used as an anti-caking agent and flow improver in the production of tablets and capsules. Aerosil is also effective in improving the stability and shelf life of pharmaceutical products.
•  Food industries: It is used as an anti-caking additive and texture improver in some food products. This material can help prevent caking and improve the stability of food.
• Cosmetics: It is used as an opacifying agent and texture improver in cosmetic products. Aerosil helps reduce skin shine and increase the shelf life of cosmetic products.

With this range of applications, Aerosil is recognized as a strategic additive in advanced industries and its presence plays a key role in increasing the quality, stability and final performance of products.

Advantages and disadvantages of Aerosil

Aerosil, or amorphous nanosilica, is known as one of the most widely used additives in various industries due to its unique structural properties. This material has many technical advantages, but along with that, there are also challenges in its application and maintenance.

Advantages of Aerosil:

•  Increase in strength and resistance: Aerosil acts as a mechanical reinforcement and increases the strength and resistance of various materials.
• Improvement of rheological properties: This material can change the viscosity of liquids and improve their flow properties.
•  Lightness and high volume: Aerosil is very light due to its high particle volume compared to its low weight, and this feature makes it suitable for various applications.
• Thermal and electrical insulation: It is used as a thermal and electrical insulator and is resistant to high temperatures.

Disadvantages Aerosil:

• May cause respiratory tract irritation if inhaled.
• Requires careful management in the manufacturing and application process to prevent dispersion in the workplace.

Despite some technical limitations in the field of safety and material management, the benefits of Aerosil, including increased strength, viscosity control, lightness and insulating properties, have made it a key additive in the formulation of many industrial and specialty products.

Aerosil Production Method

The Aerosil (fumed silica) production method is summarized as follows:

1. Raw materials: Using silicon tetrachloride (SiCl₄), hydrogen (H₂) and oxygen (O₂).

2. Performing the reaction at high temperature: In a special reactor, the reaction of silicon tetrachloride with hydrogen and oxygen gas takes place at a temperature of about 1100 to 1200 degrees Celsius. The result of this reaction is the production of silicon dioxide (SiO₂) in the form of vapor and hydrogen chloride (HCl) gas.

3. Formation of nanoparticles: Silicon dioxide produced under specific temperature and pressure conditions is rapidly converted into very fine particles, and these nanoparticles together form three-dimensional clusters with a branched structure that have a high specific surface area. 4. Cooling and separation: In the next step, the mixture resulting from the reaction is transferred to the cooling and particle collection section. In this section, silica nanoparticles are separated from the gas stream and the remaining gases are removed from the system.

5. Processing and drying: The collected particles are dried, filtered and, if necessary, ground to achieve the desired quality. This operation improves the distribution of the particles and prepares them for industrial use.

6. Final Packaging: Finally, the dried silica powder is placed in industrial packaging resistant to moisture and contamination and is ready for use in various applications in the paint, plastic, pharmaceutical, cosmetic and food industries. The Aerosil production process combines advanced technology and precise control of reaction conditions, resulting in a material with unique properties such as softness, high surface area and chemical stability.

Aerosil Storage Method

Storing Aerosil (fumed silica) requires some specific points to maintain its quality and properties. Aerosil is chemically inactive and will not change chemically even after decades under proper storage conditions. Below are the most important points related to the Aerosil storage method:

1. Dry and cool environment:

– Humidity: Aerosil should be stored in a dry environment away from moisture. Moisture absorption by Aerosil can lead to clumping and changing its properties.
– Ambient temperature: Room temperature (about 15 to 25 degrees Celsius) is suitable for storage. Avoid placing Aerosil in extremely high or low temperatures.

2. Proper packaging:

– Original packaging: Keep Aerosil in its original, sealed packaging. This packaging is usually made of materials that prevent moisture and contaminants from entering.
– Tight lid: If you open the packaging, make sure the lid is tightly closed to prevent air and moisture from entering.

3. Away from other chemicals:

– Incompatible materials: Keep Aerosil away from incompatible chemicals. Contact with some chemicals can change its properties or cause unwanted reactions. It must be ensured that Aerosil does not come into contact with hydrofluoric acid or strong alkalis, as these substances react with silicon dioxide in principle.

4. Proper ventilation:

– Air ventilation: The storage area must be well ventilated to prevent dust accumulation.

5. Avoid pressure and impact:

– Pressure and impact: Aerosil is a light powder material and must be protected from pressure and mechanical impact that may damage the packaging and disperse the powder.

6. Proper labeling:

– Labeling: Aerosil packages must have clear and legible labels that include information about the product, date of manufacture, and expiration date. Although Aerosil can be considered suitable for long-term storage under appropriate conditions (no risk of aging or decomposition), we recommend that the above products be used within two years from the date of manufacture.

Essential Safety Tips When Working with Aerosil: A Complete Guide

Aerosil, due to its very fine, nanometer-sized powder nature, requires compliance with specific safety tips to protect the health of employees. Safety when working with Aerosil is the top priority to prevent potential hazards from inhalation or skin contact. Below are the most important safety measures you should follow when working with this amorphous nanosilica:

1. Respiratory Protection

Since aerosol particles are very small and light and easily dispersed in the air, respiratory protection is of great importance.

• Respirator Masks: Always use a appropriate filter mask, such as an N95 mask or a mask with a P100 filter, to prevent inhalation of particulate matter. These masks prevent respiratory tract irritation and possible problems.

2. Eye Protection

The eyes are directly exposed to particulate matter and should be carefully protected.

• Safety goggles: The use of protective safety goggles is essential to prevent direct contact of aerosol particles with the eyes. This prevents irritation, burning, and eye damage.

3. Skin protection

Direct contact of aerosol with the skin can cause dryness or irritation.

• Safety gloves: Be sure to use appropriate gloves (such as latex, nitrile or vinyl).
• Protective work clothes: Wearing long, loose-fitting work clothes also helps protect your skin.

4. Workplace ventilation

Controlling the concentration of aerosol particles in the air through proper ventilation is vital.

• Ventilation system: Ensure that the workplace has a appropriate industrial ventilation system to quickly remove airborne particles from the environment.
• Local exhaust hoods: When working with larger quantities, the use of local exhaust hoods (chemical hoods) to extract particles at the source is strongly recommended.

5. Waste management and cleaning

Proper waste management and regular cleaning prevents the re-dispersion of particles.

• Industrial vacuum cleaner: Use industrial vacuum cleaners equipped with HEPA filters to clean surfaces and collect spilled particles.
• Avoid blowing: Absolutely avoid methods such as dry sweeping or blowing air that cause particles to disperse.

6. Training and information

Employee awareness and training play an important role in preventing accidents.

• Safety Training: All employees who handle Aerosil should be trained on the potential hazards of Aerosil and safe and proper handling methods.
• Access to SDS: Material Safety Data Sheets (SDS) for Aerosil should be available at all times to provide employees with complete information on the properties, hazards, and emergency procedures.

Following these safety tips will help to protect your health and safety and that of your colleagues when working with Aerosil.

Innovation in Aerosil: New Technologies and the Future of Nanosilica

Aerosil, also known by its scientific name Amorphous Nanosilica, is still the subject of advanced research and development of new technologies, despite its wide applications in various industries. Innovation in the production and modification of aerosil has opened up new horizons for this widely used material.

One ​​of the most important recent achievements is the development of surface-modified aerosil. This advanced type, with special capabilities such as increasing hydrophobicity, improving dispersibility in resins and polymers, and even creating catalytic properties, plays an important role in improving the performance of engineering systems.

Other emerging trends include precise control of particle size and shape during the synthesis process. This technology enables the production of specialized grades with high specific surface and optimized porous structures, which play a key role in applications such as advanced nanocomposites, smart drug delivery systems and energy storage.

Advancements in aerosil technology not only optimize the final performance of industrial products, but also pave the way for entry into new fields such as Pharmaceutical, nanoelectronics and new energy industries also provide.

Factors Affecting Aerosil Price

Aerosil price, like many specialty chemicals, is affected by several factors. Understanding these Aerosil pricing factors is essential for wholesale buyers and industries to better plan their budgets and make strategic purchases. Here are the most important factors that affect the cost of amorphous nano silica:

1. Grade and type of aerosil

One of the main factors affecting the price of aerosil is its grade and type.

• Hydrophilic Aerosil: This type, which is not modified silica, is usually lower priced.
• Hydrophobic Aerosil: Due to the complex process of chemical surface modification with silanes, silazanes or siloxanes, hydrophobic Aerosil is more expensive.
• Pharmaceutical and food grades: These grades are higher priced than industrial grades due to the need for very high purity, strict quality control and adherence to strict standards.

2. Manufacturer and Brand

The brand of Aerosil and the country of manufacture also play an important role in pricing.

• Reputable German brands: Companies like Degussa and Evonik tend to have higher prices due to their global reputation for high quality and purity.
• Asian (e.g. Chinese) brands: Brands like Xysil, Upsil, and GBS generally offer more competitive prices while still maintaining good quality. Differences in production and labor costs also play a role in this.
  

  3. Purchase and order volume

  Like many goods, Aerosil purchase volume has a direct impact on its unit price.

  • Bulk purchase of Aerosil: Usually, with increasing order volume (for example, purchasing in high tonnage), the unit price of Aerosil decreases. Suppliers offer greater discounts for large orders.

  4. Market and exchange rate fluctuations

  The global chemical market and exchange rate also affect the final price of Aerosil in the importing country.

  • Exchange Rate: Since Aerosil is mainly imported, exchange rate fluctuations (especially the dollar or euro) directly affect the purchase price of Aerosil in the domestic market.
  • Supply and Demand: Supply and demand conditions in the global and regional market, possible shortages of raw materials, and changes in factory production capacity can all affect the price of Aerosil.