597 results about "Ion selectivity" patented technology

An iontophoresis device useful for administering an ionic drug by iontophoresis has an iontophoresis electrode section (active electrode section) and a ground electrode section (inactive electrode section) both of which are to be connected to a power source. The iontophoresis device includes elements (members) of both of the electrode sections are all formed of membrane bodies, and includes ion exchange membranes different in ion selectivity, one being selective to ions of the same species as charged ions of the ionic drug and the other to ions different in species from the charged ions of the ionic drug that are arranged in the iontophoresis electrode section, and at least an ion exchange membrane selective to ions opposite to the charged ions of the ionic drug is arranged in the ground electrode section. The iontophoresis device can administer the ionic drug stably over a long period of time at high transport efficiency.

The invention provides a method for preparing battery-level lithium carbonate by using salt lake brine. The method uses salt lake brine in Qinghai as a raw material and uses an ion selectivity separation device to transfer magnesium and lithium ions in the raw material of the brine under the effect of an electric field; when the raw material of the brine passes through a separation membrane with selectivity, monovalent ions, such as the lithium ions and sodium ions can pass through, but divalent ions, such as magnesium ions and calcium ions can be separated, so that lithium-enrichment brine with a low ratio of magnesium to lithium is obtained after the separation; impurities, such as Ca<2+>, K<+>, SO4<2-> and Mg<2+>, in the lithium-enrichment brine with the low ratio of the magnesium to the lithium can be deeply removed; an auxiliary material of a pure alkali solution can be purified; the lithium-enrichment brine after deep removal of the impurities is subjected to three-effect evaporation and concentration after neutralizing with acid; alkali is added into the concentrated lithium-enrichment brine at a certain temperature for lithium sedimentation; and finally, the finished product of the battery-level lithium carbonate can be obtained by drying and cooling after filter press, washing and centrifugal separation washing are carried out. The battery-level lithium carbonate meets the requirements of the local standard DB63/T1113-2012 (brine battery lithium carbonate) in the Qinghai Province.

The invention relates to a method for preparing a silver-loaded modified bacterial cellulose-based composite functional wet dressing, which comprises the following steps: (1) placing the freeze-dried bacterial cellulose in a nitroxyl/enzyme system solution, adding an oxidizing agent reaction; (2) adding diamine substances to the solution, heating and reacting; (3) then soaking in silver nitrate solution to obtain bacterial cellulose containing selectively loaded silver ions; Obtain bacterial cellulose selectively loaded with nano-silver particles; (4) finally add the compound solution, take it out after standing at room temperature, and after partial drying, packaging, and sterilization, the silver-loaded modified bacterial cellulose-based compound type can be obtained Functional wet dressing. In the method of the invention, the antibacterial nano-silver can be loaded on the C6 hydroxyl group of the bacterial cellulose, and the functional medicine can be compounded. The prepared dressing can treat various skin injuries, wounds, burns and scalds, etc., and has good antibacterial and repairing effects.

The invention discloses an inorganic matter-filled poriferous composite membrane for a liquid flow energy-storage cell and a use thereof. The inorganic matter-filled poriferous composite membrane for a liquid flow energy-storage cell is characterized in that one or more of organic polymer resins and sulfonated organic polymer resins are prepared into a poriferous diaphragm as a matrix; inorganic matter particles are filled into apertures of the matrix so that the inorganic matter-filled poriferous composite membrane is obtained; and the inorganic matter particles are prepared from one or more of silicon oxide, zirconia, titanium oxide, lead oxide, tungsten oxide and zirconium phosphate. The inorganic matter-filled poriferous composite membrane can be prepared by simple processes, has controllable apertures, is suitable for large-scale production, has high ion selectivity, hydrophily and ion conductivity, can realize ion transport without introduction of any ion exchange groups, and broadens a selection scope of liquid flow energy-storage cell membrane materials.

The invention provides ion exchange and electrochemical methods and devices employing anion exchange polymers produced by substantially simultaneous quaternization and polymerization reactions. Anion selective polymers are produced in accordance with the invention by combining, an ethylenic tertiary amine monomer, an alkylating agent having a boiling point temperature of at least about 100° C., and a cross-linking agent in the presence of a polymerizing agent for a time and at a temperature sufficient to form the polymer. The alkylating agent and the cross-linking agent may be the same compound, a cross-linking alkylating agent. The polymers may be produced in the presence of solvents and/or in the presence of diluting monomers which are incorporated into the polymers.

A hand-held portable drug monitoring system to detect and quantitate cocaine and other organic drugs in saliva, sweat, and surface wipes by using an ion selective electrode or an array of ion selective electrodes. The ion selective electrode has a cast membrane reference electrode and a sensing electrode with a hydrophobic polymer, a plasticizer, and an ionophore selective for the organic drug to be tested. The ion selective electrode can be connected to a converter that coverts a voltage reading from the ion selective electrode to a quantitative drug concentration level. Also disclosed is the related method of using an ion selective electrode to detect an organic drug in saliva, sweat, and surface wipes, the method of testing electrical contact in an ion selective electrode, and the method of making a cast membrane reference electrode.

The present invention provides a new design for high capacity stationary phases for dianion selective ion chromatography. The stationary phases include one or more layers which are products of condensation polymerization. Multiple components are of use in forming the first polymer layer and the condensation polymer structure, thereby providing a stationary phase that can be engineered to have a desired property such as ion capacity, ion selectivity, and the like. Exemplary condensation polymers are formed by the reaction of at least one polyfunctional compound with at least one compound of complimentary reactivity, e.g., a nucleophilic polyfunctional compound reacting with an electrophilic compound.

The invention relates to fluorescent probe detection, in particular to a derivative L of rhodamine B, preparation thereof and use thereof. The derivative L of the rhodamine B has a structural formula (I). The preparation method of the derivative L of the rhodamine B comprises: firstly, reacting the product of the hydrazinolysis of the rhodamine B with glyoxal to obtain an intermediate compound; and secondly, reacting the intermediate compound with benzyldithiocarbazate in a molar ratio of 1:1 in absolute ethanol under a refluxing condition for 4 to 6 hours, cooling, filtering precipitated solid, washing with absolute ethanol and ethyl ether in turn and drying under vacuum to obtain a target compound. The derivative L of rhodamine B can serve as a fluorescent probe. In the invention, the derivative L of rhodamine B is obtained by an effective synthesis means, the copper ion selectivity is high, and the detection of copper ions can be realized on the basis of optimized experimental conditions.

The invention relates to a method for preparing a porous separation membrane. The invention also relates to a redox flow energy storage battery comprising the porous polymer separation membrane disclosed by the invention, and particularity relates to a vanadium redox flow battery. A membrane material is simple in preparation method, good in chemical stability, and good in aperture controllability, and can be easily produced in the large scale. By using the prepared membrane material, the separation of different ions can be effectively achieved, and the ion selectivity of the membrane is kept. By adopting the method, the concentration range of a casting membrane solution is widened, the capacity of regulating and controlling the membrane structure through the concentration of the casting membrane solution is expanded, and the method is applicable to application of all membrane structures which are adjusted through the concentration of the casting membrane solution.

The invention relates to application of a polymer porous separation membrane in a liquid flow energy storage battery. The porous separation membrane is a polyvinylidene fluoride porous separation membrane with controllable pore diameter, wherein the molecular weight of polyvinylidene fluoride is between 10,000 and 100,000, the pore diameter of the porous membrane is distributed in the range of 0.1-500nm, the porosity is 30-90 percent, and the membrane thickness is 30-1,000um. The membrane materials are simple in preparation method, good in chemical stability and controllable in pore diameter, and large-scale production can be easily realized; The prepared membrane material can easily realize separation of ions with different valence states, and keep the ion selectivity of membranes. Furthermore, the membrane materials can transfer ions without introducing any ion exchange groups, so that the selection range of liquid flow energy storage battery membrane materials can be expanded.

The invention provides a preparation method and applications of graphene aerogel. The graphene aerogel is prepared by the following steps: oxidizing a graphene water solution, and then preparing the graphene aerogel through a hydrothermal method. The graphene aerogel can be used as an ion-selective electrode, and can be especially used as an ion-selective electrode to detect the nitrate ions. The graphene aerogel is innovatively used as an ion-selective electrode applied in electrochemical detection, the detection results are excellent, and the application range of graphene aerogel based materials is enlarged.

The invention relates to a method for purifying a degraded amine solution. In the method, solid purities, thermal stable salts and degraded products in an alcohol amine solution are removed by filtration, impurity removal and a strong alkali-weak alkali mixed resin purification process. Solid granules in the alcohol amine solution are removed by using a filter medium such as a molecular sieve, active carbon or an ion exchange membrane or the like; and then the filtered alcohol amine solution is subjected to ion exchange through strong alkali-weak alkali mixed resin to remove the thermal stable salts and the degraded products in the alcohol amine solution. When the pressure drop of the amine solution passing through the filter medium is over high and the airspeed is low, the filter medium is regenerated or replaced, and the regenerated resin is recycled. The method has the advantages that: the loss of the resin can be reduced by filtration and impurity removal, regeneration of the resin is favorable, and the regeneration cost is reduced; and synchronous removal of multiple ions in the alcohol amine solution can be realized by using different ion selectivity of the strong alkali-weak alkali mixed resin, and the removal efficiency is improved.

The present invention discloses a method using 1,4-dihydroxy-9,10-anthraquinone thiosemicarbazone compound as a fluorescent probe to detect copper ions, and belongs to the technical field of optical analysis detection. The recognition effect of the 1,4-dihydroxy-9,10-anthraquinone thiosemicarbazone compound and various metal ions is investigated and studied experimentally, a good copper ion selective recognition effect of probe molecule ESN is found, due to the solubility of hydroxyl and water, the probe molecule can achieve the fluorescence identification of the copper ions in an aqueous solution, a better result can be achieved under physiological pH condition, the method is green, specific in copper ion selectivity and relatively high in sensitivity, and can play fluorescence quenching role in short reaction time, and the probe molecule can be successfully applied to the detection of the copper ions in biological living cells.

The invention belongs to the technical field of ion selective separators, and in particular relates to an ion selective separator for a lithium sulfur secondary battery, and a preparation method and an application method of the ion selective separator. According to the ion selective separator provided by the invention, the separator of the lithium sulfur battery is made from an ion selective material or a compound structure of the ion selective material, and the shortcomings of quite low charging and discharging efficiency and quite poor battery performance stability caused by the dispersion of polysulfide of an original lithium sulfur battery between the anode and the cathode are conquered. As the selective transmission of the lithium cation is allowed to transmit and the transmission of the polysulfide anion is blocked in an electrolyte system of the lithium sulfur battery, the whole electrochemical performance of the battery system is improved. Targeted at that the original separator system only provides the single type function of electron insulation between the anode and the cathode, the ion selective separator provided by the invention can simultaneously achieve the two functions of electron insulation and ion selective transmission and has the potential to provide a new solution scheme for the technical obstacles of polysulfide migration inhibition and the like of the lithium sulfur battery, and the practicability of the sulfur in the lithium sulfur secondary battery can be promoted with a high-capacity anode material used in combination.

The invention relates to a fluorescent probe for detecting sulfur ions in mitochondria. The fluorescent probe is an RhS fluorescent probe, and the structural general formula of the RhS fluorescent probe is shown in the formula (I). The fluorescent probe can be rapidly positioned in the mitochondria and used for performing online real-time detection on the sulfur ions and hydrogen sulfide ions in the mitochondria. In addition, the probe also has relatively good chemical and optical stability, relatively good solubility and bio-compatibility and relatively high sulfur ion selectivity without interferences caused by other species such as reactive oxygen, reactive nitrogen and the like. Laser confocal imaging experiments show that the probe has relatively good cell permeability without causing toxic or side effects to cells and organisms.

The invention provides a preparation method of a monovalent ion selective composite film based on a template method. The method comprises the following steps of firstly, preparing polycation electrolyte aqueous solution A containing template ions and polyanion electrolyte aqueous solution B for self assembling; secondly, soaking a pretreated basal film in the solution A, flushing after soaking, then soaking the pretreated basal film in the solution B, flushing in the same way to finish two-layer assembling, and repeatedly soaking until the final assembling layers are 2-30; thirdly, placing the composite film in solution of a cross-linking agent to perform crosslinking after the composite film is subjected to self assembling layer by layer; and finally, soaking the prepared composite film by using diluted hydrochloric acid and the like to obtain the monovalent ion selective composite film based on the template method. The monovalent ion selective composite film can be used for conveniently separating monovalent sodium ions and monovalent potassium ions in seawater from polyvalent calcium ions and polyvalent magnesium ions in the seawater, and is stable in separation property and wide in application range.

The invention discloses a battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, a lithium-sulfur battery and preparation methods therefor. An N source required in a bacterial cellulose biological culture process is adopted for N doping to prepare a battery positive electrode material; a battery sandwich layer with strong adsorption capacity is prepared by compounding of a super-light carbonized bacterial cellulose sandwich layer and porous carbon; a battery diaphragm material is prepared by combination of an ion selectivity barrier layer Nafion and bacterial cellulose aerogel; and the battery positive electrode based on the nitrogen-doped carbonized bacterial cellulose, the carbonized bacterial cellulose functional sandwich layer, and the Nafion/BC diaphragm are assembled into the lithium-sulfur battery. By virtue of the N element doping, the functional sandwich layer introducing and joint use of the Nafion/BC diaphragm, the dispersion of polysulfide to a lithium negative electrode is controlled in a multi-dimension manner, so that multi-level suppression specific to the dispersion of polysulfide is realized, and a shuttle effect is effectively controlled; and the assembled Li-S battery has high specific capacity, high coulombic efficiency and stable cycle performance.

The present invention provides a new design for high capacity stationary phases for chromatography, for example, ion chromatography. The stationary phases include a first polymer layer in contact with and at least partially coating the substrate of the stationary phase. The first polymer layer serves as a foundation for the attachment, and in various embodiments, the growth and attachment, of a highly hyperbranched polymer structure, typically based on one or more products of condensation polymerization. Multiple components are of use in forming the first polymer layer and the hyperbranched polymer structure, thereby providing a stationary phase that can be engineered to have a desired property such as ion capacity, ion selectivity, and the like. Exemplary condensation polymers are formed by the reaction of at least one polyfunctional compound with at least one compound of complimentary reactivity, e.g., a nucleophilic polyfunctional compound reacting with an electrophilic compound.

The invention relates to detection of heavy metal ions, in particular to a method and a device for detecting low-concentration heavy metal ions. The method comprises the following steps of: inserting an ion selective electrode into a solution containing ions to be detected at high concentration of 10<-2> to 10<-5>M and applying pulse current of -1*10<-4> to -1*10<2> mu A to ensure that two adjacent kinds of high-concentration solution to be detected can achieve a Nernst response, and adhering a polymer sensitive film to the bottom of the ion selective electrode; measuring the Nernst response of the solution containing the ions to be detected at the concentration of below a reference until the lowest detection limit of the ions is reached, wherein a potential value of the solution containing lower-concentration ions to be detected is used as the reference; drawing a standard curve according to the detected value and current and solution concentration values; and measuring the solution containing the ions to be detected at the unknown concentration by a gradually approaching method, and acquiring the concentration of a solution sample according to the applied current, the acquired potential value and the standard curve. By the method and the device, the detection limit of the ion selective electrode is obviously reduced, and the sensitivity of the electrode is improved.

The invention discloses a novel anion exchange resin. The anion exchange resin treats aromatic polymer as a main chain, and is modified to make the side chain of the anion exchange resin contain sulfonamide quaternary ammonium salt, so the ion selectivity is strong, and anions can be efficiently conducted, thereby the anion exchange resin has good application values and development potentials in fuel cells, water treatment, wet method metallurgy, the electrochemistry, chemical industry separation, the atomic energy industry and the like.

The invention relates to the technical field of modified materials and discloses a corncob modified material and its preparation method and application. The preparation method of the modified material comprises the following steps: S1, drying and crushing to obtain a corncob powder of 90-160 meshes; S2, immersing the corncob powder with a sodium hydroxide solution and a salpeter solution to obtain a pretreated corncob powder; S3, immersing the pretreated corncob powder in water, adding an initiator, adding a monomer, reacting at the reaction temperature of 25-40 DEG C for 1-2.5h, and separating to obtain a crude product; and S4, purifying the crude product to obtain the corncob modified material. According to the corncob modified material, physical adsorption and chemical adsorption synergism of corncob are fully performed. The corncob modified material has a good adsorption effect and has strong heavy metal ion selectivity.

The invention relates to a fluorescence-enhanced Hg<2+> detection chip based on oligonucleotide chains and a method thereof. The invention is characterized in that Hg<2+> can specifically realize the covalent binding with T basic groups on two adjacent full thymine (T) oligonucleotide chains to form a stable intermolecular T-Hg<2+>-T structure, thus inducing the release of complementary chains hybridized with the full T oligonucleotide chains. The preparation method comprises the following steps: fixing a detection probe onto a chemically modified glass slide, and then respectively hybridizing with the fluorescence-labeled and quencher-labeled complementary chains. When the chip is in use, only a sample to be detected needs to be added onto the chip and kept for a time period, the chip is rinsed and then scanned by a fluorescence chip signal analysis system, and the change of a fluorescence signal is analyzed to realize Hg<2+> detection. The higher the Hg<2+> concentration in a sample is, the more the fluorescence signal is enhanced. The concentration range of the detected Hg<2+> is 10 nM-100 muM. The invention has favorable ionic selectivity.