7results about How to "Controllable pore structure" patented technology

The application provides a multistage composite microporous membrane electrode and a preparation method and water treatment and purification method thereof. The multistage composite microporous membrane electrode comprises an inorganic ceramic microfiltration membrane, an anode electrocatalytic active layer and a cathode electrocatalytic active layer; the anode electrocatalytic active layer and the cathode electrocatalytic active layer are respectively located on the two sides of the surface of the inorganic ceramic microfiltration membrane; the thickness of the inorganic ceramic microfiltration membrane is 2-6 mm, the thickness of the anode electrocatalytic active layer is 100-800 nm, and the thickness of the cathode electrocatalytic active layer is 1 micrometer-1 mm; the inner wall of the pore of the inorganic ceramic microfiltration membrane is loaded with silicon zeolite nanocrystals; and the particle size of the silicon zeolite nanocrystals is 50-200 nm. When the multistage composite microporous membrane electrode is used for water treatment and purification, oxygen molecules can be efficiently enriched in micropores, the conversion efficiency of hydroxyl radicals is improved, and the efficient removal of refractory organic matter is realized.

The application discloses a hard carbon negative electrode active material and a preparation method and application thereof. The preparation method of the hard carbon negative electrode active material comprises the following steps: (1) dissolving gelatin and a reducing sugar in water to obtain an electrostatic spinning solution; (2) performing electrostatic spinning on the electrostatic spinning solution by taking an aluminum foil as a receiving base material to obtain an electrostatic spinning nanofiber membrane, and then performing standing to completely volatilize water, so that a gelatin-based nanofiber negative electrode precursor is formed; and (3) performing pre-carbonization treatment on the gelatin-based nanofiber negative electrode precursor in a nitrogen atmosphere, and then performing high-temperature carbonization, so that the hard carbon negative electrode active material is obtained after cooling. The hard carbon negative electrode active material prepared by the method can realize the controllability of the pore structure and the carbon-hydrogen microstructure of the hard carbon negative electrode active material, the prepared hard carbon negative electrode active material does not need a support body and a binder, the weight and the volume of the electrode can be reduced, and the overall energy density and the power density of the battery can be improved.

The invention discloses a controllable thermal expansion preparation method of a graphene oxide layer. The controllable thermal expansion preparation method comprises the following steps: S1, preparing a modified graphene oxide precursor; s2, preparing a graphene oxide layer preform; s3, gradient heating controllable thermal expansion treatment is carried out; s4, post-treatment shaping is carried out; graphene oxide is modified through an amino silane coupling agent, amino functional groups are introduced, the interlayer acting force of graphene oxide is regulated and controlled, a precursor foundation is provided for subsequent controllable thermal expansion, and the problem that thermal expansion is uncontrollable due to the fact that the interlayer acting force of a traditional precursor is unstable is effectively solved; a gradient heating thermal expansion process is adopted, the heating rate and the constant temperature time are controlled in three stages, moisture removal, functional group decomposition and deep expansion are carried out in order, local excessive expansion or insufficient expansion caused by a single heating rate is avoided, and it is ensured that the graphene oxide layer expands uniformly and the pore structure is controllable.

The utility model provides a testing device for measuring a moisture characteristic curve of geotechnical cloth, which comprises a support main body, and a cylinder body and a separated cylinder body are arranged on the support main body, wherein the height of the cylinder body can be freely adjusted; the upper part and the lower part of the barrel are provided with water outlet holes and are connected with a multi-port water valve, and the upper part is also provided with a water adding hole; the separated cylinder comprises an upper cylinder and a lower cylinder which are connected through a flange, an argil plate is horizontally arranged in the lower cylinder, the air inlet value of the argil plate is greater than that of a geotechnical cloth sample, the edge of the argil plate is hermetically connected with the side wall of the lower cylinder, and the upper part and the lower part of the separated cylinder are provided with water outlet holes and are connected with a single-port water valve; the separated cylinder upper single-port water valve is communicated with the cylinder upper multi-port water valve through a water pipe, and the lower single-port water valve is communicated with the lower multi-port water valve. The device is simple in composition and convenient to construct, can simultaneously test a plurality of samples, effectively solves the problem of influence of environment temperature on test results, and can simultaneously test moisture characteristic curves of geotechnical cloth under various working conditions.

This invention proposes a porous foam with a biomimetic lotus seedpod surface structure and its preparation method, belonging to the technical field of photothermal conversion materials, to solve the technical problems of poor water evaporation performance and salt resistance in solar evaporators. This invention proposes a composite foam prepared using a combination of vacuum solution casting technology / salt template method / template-assisted technology, which simultaneously possesses a hemispherical pore structure on the surface and a honeycomb-like hierarchical pore structure in the lower layer. Benefiting from the unique surface and internal pore structure, the solar evaporator exhibits highly efficient and stable evaporation performance in NaCl solutions of different concentrations, high salt resistance, and good self-cleaning ability. This double-layer hierarchical porous composite foam has broad application prospects in wastewater treatment and seawater desalination. The preparation method has advantages such as simple process, convenient operation, controllable surface pore structure and internal pore morphology, and the ability to form evaporators with complex shapes.

The invention relates to a preparation method of a graded porous Murphy material based on cooperation of microfluidics, ink-jet printing and emulsion evaporation, and solves the technical problems that an existing preparation method of the graded porous Murphy material is harsh in condition, the porosity is difficult to regulate and control, and the prepared porous material is unstable in pore structure and low in uniformity. Silicon dioxide nano particles are introduced into an emulsion dispersion phase, self-assembly of the nano particles is driven by utilizing cohesion force generated by preferential evaporation of the dispersion phase, a silicon microsphere single-layer structure in hexagonal arrangement is formed, macroscopic pores are formed among microspheres, mesoscopic pores are formed among nano particles in the microspheres, and finally the graded porous Murphy material is obtained.

The application provides a mixed matrix membrane with high stability, a preparation method and application. The method adopts a phase inversion method, uses prepared UiO-66 and cellulose acetate with excellent chemical stability as raw materials to prepare a support layer membrane, and then synthesizes a polyamide active layer by polymerization of acyl chloride monomers and amine monomers on the support layer membrane, so that the required mixed matrix membrane is obtained. The prepared mixed matrix membrane has high desalination performance and high stability, and has a wide application prospect in the fields of seawater desalination and wastewater purification.