50 results about "Membrane conductivity" patented technology

The invention provides an application of an MXene membrane in reverse electrodialysis power generation, and the MXene membrane has a two-dimensional layered structure, wherein the thickness of the MXene membrane is 1-30 microns, and the single-layer spacing is 0.1-0.5nm. When the MXene membrane is applied in reverse electrodialysis power generation, a power generation system with higher membrane conductivity, stronger ion conductivity, larger ion exchange capacity, lower membrane resistance and stronger ion selectivity can be obtained, so that higher power generation efficiency is provided, and the maintenance time is long. Moreover, the MXene membrane is applied in the reverse electrodialysis power generation process, so the concentration and pH range of the concentrated salt solution andthe dilute salt solution can be expanded, high power generation efficiency can be ensured in the environments with small concentration difference, acidity and alkalinity, and the MXene membrane has agood application prospect in the field of reverse electrodialysis.

In polymer electrolyte membrane (PEM) fuel cells and electrolyzes, attaining and maintaining high membrane conductivity and durability is crucial for performance and efficiency. The use of low equivalent weight (EW) perfluorinated ionomers is one of the few options available to improve membrane conductivity. However, excessive dimensional changes of low EW ionomers upon application of wet / dry or freeze / thaw cycles yield catastrophic losses in membrane integrity. Incorporation of ionomers within porous, dimensionally-stable perforated polymer electrolyte membrane substrates provides improved PEM performance and longevity. The present invention provides novel methods using micromolds to fabricate the perforated polymer electrolyte membrane substrates. These novel methods using micromolds create uniform and well-defined pore structures. In addition, these novel methods using micromolds described herein may be used in batch or continuous processing.

An advanced control system for a membrane bioreactor based wastewater treatment plant is disclosed. The disclosed control system comprises a membrane bioreactor (MBR) system and a microprocessor based controller that receives signals corresponding to selected measured MBR parameters and calculates or estimates one or more MBR calculated parameters including Membrane Conductivity (Fxc); and / or Oxygen Uptake Rate (OUR). The microprocessor based controller compares one or more calculated or estimated MBR parameters to prescribed setpoints or desired ranges and governs one or more pumps and valves in the MBR system to adjust the cleaning cycle in the MBR system, the MBR flows in the MBR system, or the influent flow to the biological basin in response thereto.

The invention provides a preparation method of a flexible elastic stress sensing conductive film and belongs to the technical field of conductive materials. According to the preparation method of theinvention, metal conductive nanoparticles are modified, so that the metal conductive nanoparticles can be uniformly dispersed in a polymer material, and the load capacity of the metal conductive nanoparticles is increased. The film provided by the invention combines the conductivity of the metal conductive nanomaterial and the flexibility of the polymer material; when the film is subjected to tensile and compressive stress, the polymer material is deformed, and therefore, the nano conductive particles move, electron delocalization occurs, and the conductivity of the film changes, and as a result, a piezoresistive effect can be directly measured according to the magnitude of the deformation. In the light of experimental data in the embodiments of the present invention, the load capacity ofthe metal conductive nanoparticles in the polymer material can reach 45%.

The invention discloses poly(2-hydroxyethyl methacrylate) and an anion exchange membrane for a vanadium battery. Poly(2-hydroxyethyl methacrylate) has a structure as shown in the formula (I). The substrate of the anion exchange membrane for the vanadium battery is a hydrophobic porous membrane, the surface of which is covered with a layer of poly(2-hydroxyethyl methacrylate). Poly(2-hydroxyethyl methacrylate) provided by the invention can be prepared into a membrane which can be used in the field of vanadium redox flow batteries, and has good vanadium resistance, proton conductivity, mechanical properties, chemical stability and film forming performance. The membrane conductivity reaches the magnitude of 10<-2>S / cm. The vanadium ion permeability reaches 10<-7>cm<2> / min. In addition, the preparation method of the anion exchange membrane for the vanadium battery has advantages of simple and practicable preparation process and low cost, is suitable for industrial production, and is environmentally friendly.

The invention discloses a proton exchange membrane conductivity test system, which includes a test chamber, a humidity adjustment device, a temperature adjustment device, a pressure adjustment device, an electrochemical workstation and a control terminal. The test chamber includes a chamber body and a test fixture, and the test fixture is located at In the chamber; the humidity regulating device includes a humidity sensor, a hydrogen storage tank, a nitrogen storage tank, a first controller, a second controller and a humidifier, and the inlets of the first controller are all communicated with the hydrogen storage tank and the nitrogen storage tank. Both the inlets of the two controllers are connected with the hydrogen storage tank and the nitrogen storage tank, the outlets of the first controller and the second controller are connected with the inner cavity of the warehouse body, and the humidifier is connected in series between the second controller and the warehouse body Between; the humidity adjustment device, the temperature adjustment device, and the electrochemical workstation are all electrically connected to the control terminal. The proton exchange membrane conductivity test system of the invention enables test samples to be placed in a stable environment of humidity and temperature, thereby ensuring the accuracy of the test sample conductivity.

The invention discloses a branched polymer anion exchange membrane and a preparation method thereof. The preparation of the membrane material is based on the use of chloromethylated polysulfone as a macromolecular initiator and p-chloromethylstyrene as a monomer, and a series of polymers containing branched side chain structures are synthesized by using ATRP reaction. Utilizing its abundant and highly reactive end group, the basic anion exchange membrane with low chloromethylation degree and high conductivity can be prepared through post-treatment; in addition, by adjusting the degree of branching of the side chain, it can be used in Different degrees of microphase separation are formed in the membrane to achieve the goal of taking into account the conductivity-stability of the anion exchange membrane. The anionic membrane prepared by the invention has strong structure adjustability, high electrical conductivity of the membrane and good self-swelling resistance, and is of great significance for the research on the electrical conductivity and stability of the balanced membrane.