Laser particle sizer is a multi-purpose instrument for measuring the particle size distribution of suspensions, emulsions and powder samples by means of laser light scattering. . It has the outstanding features of wide test range, fast test speed, accurate and reliable results, good repeatability and easy operation. It is a new generation of particle size test instrument integrating laser technology, computer technology and optoelectronic technology.
Optical structure of laser particle size analyzer
·         　　 The optical path of the emission laser particle size analyzer, and receiving measurement window into groups of three parts. Emitting portion and a light beam from the light source into a group of processing devices, mainly parallel to provide a single instrument for the color light as the illumination light. The receiver of the optical instrument is a key structure. Measurement window is designed to allow the sample to be measured in a completely dispersed suspension through a measuring zone at a floating state, in order to obtain a particle size instrument information of the sample obtained.
Principle of laser particle size analyzer
·         Laser particle size analyzer is a laser can generate a physical phenomena that scattering particle size distribution according to the test particles. Since the laser light having a good color and a very strong one-directional, so the space between the infinite will not hinder the laser irradiated to infinity far, and propagates through the process now rarely diverging Elephant.
Mie scattering theory shows that when the particle beam encounters blocking part of the light scattering phenomenon will occur, the direction of propagation of light scattering [theta] will be formed, a size of the angle [theta] angle to the propagation direction of the main beam the size of particles, the greater the particles, the smaller the angle [theta] generated scattered light; the smaller the particles, the [theta] angle scattered light generated greater. I.e., a small scattering angle ([theta]) of the light caused by large particles; large angle (theta] 1) of the scattered light caused by the small particles. Further research showed that the intensity of scattered light representative of the number of particles of the particle size. Thus, different scattered light intensity on the angle of measurement, the particle size distribution can be obtained in the sample.
　　 Is the intensity of scattered light is measured on different angles, the processing requires the use of light scattering optical means to carry out. Placed in the appropriate position in the light beam on a Fourier lens, placing a set of the plurality of optical power detector in the back focal plane of the Fourier lens, different scattering angles of light through the Fourier lens is irradiated to the polyol when the photoelectric detector, the optical signal is converted into an electrical signal and transmitted to the computer, through a dedicated digital signal processing by this software such signals will accurately the particle size distribution.
·         1. nonmetallic powder: such as heavy calcium, light calcium, talc, kaolin, graphite, wollastonite, brucite, barite, mica, bentonite, diatomaceous earth, clay and the like.
2. Various metal powders: such as aluminum powder, zinc powder, molybdenum powder, tungsten powder, magnesium powder, copper powder and a rare earth metal powder, alloy powder.
3. Other powder: As the catalyst, cement, abrasive, medicine, pesticide, food, paints, dyes, phosphors, river sand, ceramic materials, various cloud liquid milk.
·         1. College materials
Academy 2, chemical and other laboratories
3, large enterprises Laboratory
4, focusing on laboratory
5. Research institutions
Plant extraction process
1. Select plants/herbs. No more than ancient prescriptions, prescriptions, folk herbs to find. At present, common and uncommon herbs have been studied. At present, it is mostly to increase the amount of medicinal materials to extract and separate components with low content, or to find medicinal plants that have never been studied from miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
2. The extraction. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (low polarity → high polarity). Daily medicine decoction effective, water and ethanol and other solvents with large polarity, such as artemisinin boiling ineffective extraction with petroleum ether and other solvents with small polarity. Common medicinal materials water/alcohol/ether to go through, separation and identification of more compounds.
3. The separation. This is the most important work. In the solution extracted from the second step, there are dozens of compounds, usually by column chromatography, which is often referred to as the column flushing. It's a lot of work, it's boring, it's low tech. A master's student might do this every day for two years. The column for separating compounds, as shown below, is as large as 2 meters high and as small as 10 centimeters. Change the solvent condition of mobile phase, change the material of column, different conditions and different separation principles of column repeatedly punching, can be separated from the monomer compound.
Herbal Medicine,Ginger Extract Powder,Hawthorn Berry Extract,Lycium Berry Fruit Extract
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