Application of liquid metal microsphere as pore-forming agent to preparation of solid-phase extraction column
A solid-phase extraction column and liquid metal technology, applied in ion exchange, other chemical processes, ion exchange regeneration, etc., can solve the problems of differential pore distribution, uncontrollable pore size diversity of polymer materials, etc., and achieve uniform pore structure and high column efficiency , good reproducibility
Inactive Publication Date: 2018-11-09
HENAN INST OF SCI & TECH
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Problems solved by technology
[0004] In the prior art, toxic and highly polluting organic solvents are mostly used in the process of preparing polymer porous materials for adsorption separation analysis. During the polymerization process, affected and restricted by the polymerization conditions, organic solvent porogens and functional monomers and crosslinking agents The formed polymer undergoes phase separation, and the pore size of the obtained polymer material presents the status quo of uncontrollable diversity, significant difference, and channel distribution.
Method used
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Embodiment 1
[0022] Using liquid metal microsphere gallium as the porogen, 0.5 g of gallium and 0.1 g of Tween 80 were added to 5 mL of isopropanol, the temperature was controlled at 20°C, the ultrasonic power was 150W, and the ultrasonic wave was 30 minutes to prepare the granules. Disperse liquid metal droplets with diameters ranging from 250nm to 1200nm.
[0023] The prepared dispersed liquid metal droplets were subjected to ultra-high-speed centrifugation (25000 rpm), after 15 minutes of centrifugation, the supernatant was removed and the bottom sediment was retained. This operation was repeated 3 times to remove excess surfactant. Then freeze-drying at low temperature (-40°C) to obtain liquid metal microsphere powder. Store it in a low-temperature refrigerator (-10°C) for later use.
[0024] Methacrylic acid is used as the functional monomer and ethylene glycol dimethacrylate is used as the crosslinking agent, and the ratio is 1:4. Liquid metal microspheres accounting for 50% of the tot...
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Abstract
The invention discloses the application of a liquid metal microsphere as a pore-forming agent to preparation of a solid-phase extraction column. A solid-phase extraction, adsorption and separation polymer material with controllable pore size and porosity prepared by using the method has the following advantages: 1, the pore size and porosity of the prepared solid-phase extraction, adsorption and separation polymer material can be arbitrarily adjusted according to the characteristics of target compounds so as to allow the polymer material to have adsorption pores and diffusion channels matchedwith the molecular size of adsorption and separation objects; 2, the inner pore structure of the polymer material is uniform and shows good reproducibility, so the polymer material has the characteristics of high column efficiency and capacity of carrying out fast adsorption and separation; and 3, since liquid metal droplets with nanometer and micrometer diameters are used for replacing conventional toxic highly-polluting organic solvent pore-forming agents, green recycling is realized.
Description
Technical field [0001] The invention relates to the preparation and application of a polymer solid phase extraction column, in particular to the application of liquid metal microspheres as a porogen in the preparation of a solid phase extraction column. Background technique [0002] In recent years, liquid metal has become a research hotspot in modern material processing, and can be used as sensor materials, plastics, and catalysts. In particular, gallium and gallium-indium liquid alloys, both of which have a melting point of 29.8°C, are deformable, moldable, and injectable metals. There is a strong correlation between the properties of liquid metal and its structural characteristics. Therefore, it is necessary to control its particle size, shape and structure. [0003] Through heat treatment, electron beam irradiation or pressurization, the pre-formed liquid metal nanoparticles can be induced to fuse and transform into different shapes, such as linear, triangular or sponge-like s...
Claims
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IPC IPC(8): C08J9/28C08F222/14C08F2/48C08F2/44B01J20/26B01J20/30B01D15/08C08L35/02
CPCB01D15/08B01J20/264B01J20/3064C08F2/44C08F2/48C08F222/10C08J9/28C08J2201/04C08J2335/02C08F222/102C08F220/06
Inventor 陈军白秀芝张毅军陈娜李盼盼丁浩静张裕平
Owner HENAN INST OF SCI & TECH