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Chromatographic Packing: After preparation, the particles used to fill the column are usually spherical particles with a particle size of 5-10.
Column tube: internally polished stainless steel tube. A typical liquid chromatography column size is 4.6 mm ID and 250 mm long.
Columns: Also known as stationary phases, chromatographic packings are filled into column tubes.
2. Fill the column with a dry filling method: Place a soft pad on the hard countertop, place the top of the empty column tube vertically on a soft pad, fill the funnel with 50-100 mg of filler each time, and then vertical the table pier 10-20 times .
Wet-filling: Also known as slurry filling, special filling devices are used.
3. Structure of the packing Chromatographic packing consists of two parts: the matrix and the functional layer.
Matrix: Often referred to as carrier or carrier, it is usually prepared as a spherical particle with a particle size of several micrometers to several tens of micrometers. It has a certain rigidity, can withstand a certain pressure, does not have a significant effect on separation, but only as a functional group. Carrier. Silica gel and organic macromolecule polymer microspheres are commonly used as substrates.
Functional layer: An organic molecule or functional group that is fixed on the surface of a substrate by chemical or physical means and plays a substantial role in the retention of sample molecules. A schematic diagram of the structure of the crown ether macromolecular stationary phase of the silica matrix, the functional layer crown ether molecule is adsorbed or bonded to the surface of the silica gel matrix.
The physical structure of the filler: divided into four types: microporous (or gel), macroporous (fully porous), thin shell, and superficial porous
Pneumatic components work by the pressure of gas or the force generated by expansion, that is, the elastic energy of compressed air is converted into kinetic energy. Such as cylinder, pneumatic motor, steam engine, etc. Pneumatic component is a form of power transmission, also known as energy conversion device, which uses gas pressure to transfer energy.
Pneumatic quick connector is a kind of quick connector which is mainly used for air piping and pneumatic tools. It can connect or disconnect the pipeline without tools. When the connector is not connected - when the parent's ferrule moves to the other end, the stainless steel ball will automatically roll outward, and the daughter will be disconnected under the action of the common valve spring force of the parent and the daughter, and the daughter and the parent's valves will be closed respectively, The fluid flow is blocked instantaneously.
Pneumatic Valve is driven by compressed air. It can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. In the current market economy environment, it is not perfect. For the sake of product competition, the manufacturers of pneumatic valves carry out different innovations under the concept of unified design of pneumatic valves, forming their own enterprise standards and product personality. Therefore, it is very necessary to put forward the technical requirements in detail when purchasing the pneumatic valve and reach a consensus with the manufacturer as an annex to the pneumatic valve purchase contract. This kind of valve should be installed horizontally in the pipeline.
Introduction to the knowledge of the column
1. Constitution of the column The column is the core component for separation, requiring high column efficiency, large column capacity, and stable performance. Column performance is related to column structure, filler properties, fill quality, and service conditions.