In recent years, nanomaterials have received widespread attention as a new type of material. Nanomaterials refer to crystalline, amorphous, quasi-crystalline and interface layer structures with any one-dimensional scale less than 100nm. They have surface and interface effects, quantum size effects, small size effects and macro quantum tunneling effects, so nanometers have many unique features. The performance is widely used in various fields. For this reason, this article reviews various methods of nanomaterial preparation and explains their advantages and disadvantages.
The methods currently used to prepare nanomaterials can be divided into the gas phase method, liquid phase method and solid phase method according to the state of matter.
The gas-phase method is a method of condensing high-temperature steam in a cold trap or depositing and growing low-dimensional nanomaterials on a substrate. Gas-phase methods mainly include physical vapor deposition (PVD) and chemical vapor deposition (CVD). In some cases, other heat sources are used to obtain gas sources, such as resistance heating, high-frequency induction current heating, hybrid plasma heating, and energization heating evaporation law.
1. Physical vapor deposition (PVD)
There is no chemical reaction in the PVD process. The main process is the evaporation of solid materials and the condensation or deposition of evaporating vapor. PVD can be used to prepare high-quality nanomaterial powder. PVD can be divided into the preparation of high-quality nanopowders. PVD can be divided into a vapor-condensation method and a sputtering method.
1.1 Steam-condensation method
This preparation method is to heat substances (such as metals, etc.) in inert gases such as Ar and He at low pressure to vaporize them and condense them in a gas medium to form 5-100 nm nanoparticles. Cleaner nanopowder is obtained through the evaporation and condensation process in pure inert gas. The particles prepared by this method are clean, the particle size is neat, and the growth conditions are easy to control, but the particle size distribution range is narrow.
1.2 Sputtering method
Two metal plates are used as anode and cathode, respectively. The cathode is evaporation material. Ar gas (40-250Pa) is filled between the two electrodes. The voltage range applied between the two electrodes is 0.3-1.5kv. Because of the glow discharge between the two electrodes, Ar ions are formed. Under the electric field\'s action, Ar ions impact the surface of the cathode target, causing the original product of the target to evaporate from its surface to form ultrafine particles. And deposited on the attachment surface. There are many advantages in preparing nanoparticles by sputtering: a variety of nano metals can be prepared, including high melting
Point and low melting point metals. The conventional thermal evaporation method can only be applied to low melting point metals; it can prepare multi-component compound nanoparticles, such as A152Ti48, Cu91Mn9, and ZrO2; by enlarging the sputtered cathode surface, the yield of nanoparticles can be increased.
Due to changes in consumer demand, import and export conditions, and various investigations on the development of silicon dioxide quartz, the cost of silicon dioxide quartz is constantly changing. Taking into account the current market macroeconomic parameters, value chain analysis, channel partners, demand and supply, the cost of silicon dioxide quartz will also be affected to a certain extent. It is estimated that the cost of silicon dioxide quartz will increase slightly from today to next week.
However, TRUNNANO provides high purity Nano silicon dioxide quartz with a steady price. "In order to feedback to old customers, the company is still in full operations to provide silicon dioxide quartz with competitive price," said Olina, sales manager of TRUNNANO.
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. As a leading nanotechnology development and silicon dioxide quartz manufacturer, Luoyang Tongrun dominates the market. Our professional work team provides perfect solutions to help improve the efficiency of various industries, create value, and easily cope with various challenges.
If you are looking for silicon dioxide quartz, please send an email to firstname.lastname@example.org
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