Specific surface area of ​​nano-powder material and its measuring instrument

Specific surface area is the surface area per unit mass of material (㎡ / g). It is one of the most important physical properties of ultra-fine powder materials, especially nano-powder materials. It is used to evaluate their activities, adsorption, catalysis and other properties. Important physical properties. Therefore, in the research, manufacturing and application of various ultrafine powder materials, it is very important to determine the specific surface area. With the rapid development of ultra-fine powder materials and nano materials, the production and application of various ultra-fine zinc oxide, alumina, calcium carbonate, lithium cobalt oxide, lithium manganate, carbon black, graphite and other fields of almost all powder materials It is necessary to measure the specific surface area of ​​products, and the instrument for measuring the specific surface area has become an indispensable and important equipment for many research units, universities and factories.
There are many methods for measuring specific surface area, such as Densichron Examination, CTAB, Electronic Microscopic Examination, and Tint trength ), Nitrogen Surface Area (NitrogenSurface Area), etc. Through various methods, EM Nelson believes that the low-temperature nitrogen adsorption method is the most reliable, effective, and classic method. American ASTM and international ISO have been included in the test standards (D3037 and ISO-4650). China has also listed this method as a national standard (GB-10517). In 2003, it was included in the test standard for nano-powder materials.
The nitrogen adsorption specific surface analyzer was developed on the basis of the principle of gas chromatography. It uses nitrogen as the adsorbate and helium or hydrogen as the carrier gas. The two gases are mixed at a certain ratio to reach the specified relative pressure, and then flow through the powder material sample. When the sample tube is placed in liquid nitrogen (-196 ℃) In the thermos cup, the powder material physically adsorbs the nitrogen in the mixed gas, but the carrier gas is not adsorbed. At this time, an adsorption peak appears in the chromatography workstation (gas sensor system). When the liquid nitrogen cup was removed, the powder sample returned to room temperature, the adsorbed nitrogen was desorbed, and a desorption peak opposite to the adsorption peak appeared on the workstation. The area of ​​the adsorption peak or desorption peak is proportional to the amount of nitrogen adsorbed on the sample surface, and it can also be considered to be proportional to the surface area of ​​the powder sample. Take a standard sample, such as powder material with known specific surface area, or pure nitrogen with a known volume, obtain a standard sample peak in the workstation, and the final peak can be obtained by comparing the peak area of ​​the standard peak with the sample to be tested. Specific surface area.

Measuring Spoon Set

High quality Measuring Spoon Set ,suitable for kitchen ,and useful for cooking and baking ,different capacity can help you cook more delicious food. Some of our measuring spoon set with the silicone handle ,which it more comfortable when use it.

Measuring spoon set can combine the cup set or the Mixing Bowl Set to sell. Useful for baking or cooking.

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Description of Measuring Spoon Set

 

Material:SS201/SS304

Handle :some items can add silicone handle

Finishing: Satin polishing ,Mirror Polishing ,Color painting

Logo: Laser logo, Etching logo, Silk printing logo, Embossed logo, Decal logo

MOQ : 2000 PCS

Packaging : White box, Mail box or Customized package

Sample Time : 7~10 days

Lead Time :60 days after have the deposit

Payment: T/T ,L/C or others

Payment term: 30% deposit before production and 70 % balance against the copy B/L

 

 

 

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2:How about the sample time?

Usually the sample time is 7~10 days after have the sample cost.

 

3:How long will it take for mass production?

Usually 45~60 days after have the deposit.

 

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Measuring Spoon

Measuring Spoon Set,Stainless Steel Measuring Spoon,Measuring Spoon With Silicone Handle,Stainless Steel Measuring Spoons Set

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