116 results about "Ion sensing" patented technology

The present invention relates to a reference electrode for a potentiometric electrode system, characterized in that the junction in contact with a sample solution is enlarged and an ion-sensitive membrane containing an ion selective material as a protective membrane for the inner reference solution is employed, which comprises a substrate; a metal layer; an insoluble metal salt layer; an insulating film for insulating the metal layer from an aqueous solution; a hydrogel serving as an inner reference solution; the junction on the hydrogel contacting with a sample solution; the ion-sensitive, protective membrane formed over all surface areas of the hydrogel, except for the junction, to separate the sample solution from the inner reference solution or act as an ion-sensing membrane upon the contamination of the junction, whereby the operational abnormality caused by junction contamination may be easily checked and fast activation may be achieved.

An apparatus and method to detect combustion conditions using ion signals for use in a feedback control of a reciprocation engine is presented. The ion signals are used as a feedback signal to control EGR and diesel injection timing. The apparatus is an ignition system with a spark plug type of sensor. The ignition system is used to provide a cold start mechanism for diesel engines and start of combustion for spark ignition engines. The ignition is combined with ion sensing feedback that can control the engine.

An apparatus and method to detect combustion conditions using ion signals for use in a feedback control of a diesel engine is presented. The apparatus is a spark plug type of sensor or a sensor integrated with a fuel injector. The spark plug type of sensor is used to provide a cold start mechanism combined with an ion sensing device.

A photo ionization detector (PID) is provided for selectively determining various compounds or gases present in a breath sample. The PID, comprises a substrate comprising a gas ionization chamber, at least one pair of ion sensing electrodes, and at least one amplifying circuit; and an ultraviolet (UV) ionization source to transmit a UV light beam into the gas ionization chamber. A system comprises the PID is also provided. A method of detecting a response pattern for various compounds or gases in breath using PID is also provided.

The invention relates to a nano-crystal cellulose fluorescent probe for detecting metal ions and a preparation method thereof, and belongs to the technical field of nanometer materials and fluorescence sensing crossing. The method comprises the steps that firstly, an active functional group is introduced into the surface of nano-crystal cellulose, the nano-crystal cellulose fluorescent probe is constructed through covalent bonding fluorescent dye, by means of the synergic complexing action of the surface active functional group, the fluorescence emission mechanism of the fluorescent dye is changed, and selectivity and sensitivity detection for metal ions are achieved. The nano-crystal cellulose fluorescent probe is an environment-friendly green material and is good in hydrophilia, safe, free of toxin, capable of being completely degraded and capable of being applied to the fields of metal ion sensing detection, fluorescence tracking, bioimaging and the like.

The present invention provides fluorogenic compounds for the detection of target metal ions wherein the compounds exhibit a Stokes shift greater than 50 nm and the detectable signal is modulated by photoinduced electron transfer (PET). The present compounds consist of three functional elements, the ion sensing moiety (chelating moiety), the reporter moiety (fluorophore or fluorescent protein) and spacer or linker between the sensing and reporter moieties of the present compound that allows for PET upon binding of a metal ion and excitation by an appropriate wavelength.

The invention discloses an optical ion sensing film for detecting metal ions. The optical ion sensing film comprises the following components in percentage by weight: 0.34 to 0.38 percent of ETH5418, 0.46 to 0.91 percent of quadri[3,5-bi-( trifluoromethyl)benzene]-sodium-tetraborate, 0.43 to 2.17 percent of metal ion carrier, 2.01 to 2.17 percent of up-conversion nanorod, 31.41 to 32.71 percent of polrvinyl chloride and the balance of bis(2-ethylhexyl)decandeionate or o-npoe 2-nitrophenyl octyl ether or dioctyl phthalate. The invention also discloses a preparation method for the sensing film and application of the sensing film to detection of the metal ions. The sensing film is excited by light with wavelength of 980 nanometers and the light of the sensing film is transmitted in a near infrared region, so that the sensor is not interfered with background absorption and background fluorescence; furthermore, compared with the conventional organic system, the system has higher quantum yield, and can produce high-intensity fluorescence.

An improved ion-sensing electrode for detecting ions or polyions is provided having an electrically conducting member sheathed or coated with a layer of insulation except at an exposed, uninsulated area, where the insulation free surface of the electrically conducting member is texturized, and a polymeric membrane coated on the insulation-free surface of the electrically conducting member, where the ion selective membrane includes an ionophore. The texturized surface improves the starting EMF stability and reproducibility of the ion-sensing electrodes, and further improves membrane adherence to the electrically conducting member.

The invention belongs to the field of macromolecular/inorganic hybrid materials and ion sensing application and in particular relates to a preparation method of a polyelectrolyte/graphene oxide multilayered film. The preparation method comprises the following steps: firstly, preparing a functional modified graphene oxide dispersion solution; then immersing a base material into a polyethylenimine water solution and adsorbing a polyethylenimine molecular chain on the surface; taking out the base material, washing and drying by blowing; then immersing the polyethylenimine modified base material into the functional modified graphene oxide dispersion solution; adsorbing modified graphene oxide on the surface of the base material due to electrostatic interaction, taking out the base material, washing and drying by blowing; repeating the process to obtain the polyelectrolyte/graphene oxide multilayered film with a uniform lamellar structure. The macromolecular/inorganic hybrid material and heavy metal ions have a coordinated complexing effect and a space matching effect, so that the multilayered film has selectivity and high-capacity heavy metal ion adsorption capability; a quartz crystalmicrobalance technology is utilized for realizing the adsorption response behavior of the multilayered film on various metal ions in water.

The invention belongs to the field of a metal ion sensing technology, in particular to an electropolymerizable fluorescent sensing material and application of the electropolymerizable fluorescent sensing material on fluorescent or electropolymerizable detection of metal ions. According to the electropolymerizable fluorescent sensing material, 2, 7-fluorene and 2, 2'-dipyridyl (or 1, 10-phenanthroline) are served as a main chain, and a side chain is connected with a carbazole group through an alkyl group. A rigid main chain structure of a compound provided by the invention guarantees the fluorescent sensing material to have high fluorescent efficiency, but a side chain of strong metal identification unit guarantees selectivity of a detection material. In addition, a micropore structure of a film prepared by electropolymerization can effectively guarantee the metal ions to quickly diffuse in the film and improve flexibility of film detection. According to the fluorescent sensing material provided by the invention, raw materials with cheap prices are easily obtained, and a synthesis process is relatively simple, so that the electropolymerizable fluorescent sensing material is a metal ion fluorescent/ electrochemical sensing film material with high potential.

The invention discloses a cheap preparation method of a class of yellow light-emitting carbon quantum dots. The preparation steps are as follows: using charcoal ashes produced by the industrial production of fullerenes as a raw material, adding concentrated sulfuric acid and concentrated nitric acid, ultrasonic treatment, and obtaining a dispersion liquid; The dispersion was heated in an oil bath, cooled to room temperature, diluted with distilled water and washed with K ₂ CO ₃ Adjust to neutral to obtain a crude product; centrifuge the crude product to remove the precipitate, and then perform dialysis to obtain carbon quantum dots. The raw materials selected in the invention are low in price, stable in source and simple in the preparation process. The obtained carbon quantum dots can emit yellow fluorescence and have high quantum yield, and are suitable for photoelectric conversion, biological imaging, ion sensing and other fields.

A mechanism is provided for enhancing the sensitivity of an ion-sensitive semiconductor device by creating a second gate coupled to a sense plate that can improve the amount of charge brought to the ion-sensitive semiconductor device conductivity modulated region (e.g., a channel region of an ISFET). This is accomplished by utilizing a buried dielectric layer associated with the ion-sensitive semiconductor device conductivity modulated region as the second gate dielectric. The buried dielectric layer is coupled to the sense plate using an isolated well region as a conductor that is coupled to metal layers extending to the sense plate. Some embodiments further use the buried dielectric layer as the sole gate dielectric for the semiconductor device, thereby allowing the traditional gate dielectric region to be coupled to a protection diode. This protection diode then protects the gate dielectric from plasma induced damage and electrostatic discharge.

There is provided a semiconductor device for detecting a change in ion concentration of a sample and method of using same. The device comprises a plurality of Field Effect Transistors (FETs) coupled to a common floating gate and an ion sensing layer exposed to the sample and coupled to the floating gate. There may be other input voltages coupled to the floating gate.

The invention discloses a mercury ion fluorescence probe compound, a preparation method and an application and relates to the technical field of analytical chemistry. The chemical formula of the mercury ion fluorescence probe compound is obtained through derivatization with 2-(2'-hydroxyphenyl) benzimidazole serving as a parent structure. The probe has good selectivity for mercury ions, is high in sensitivity and easy to prepare and is an ideal mercury ion sensing molecule.

Apparatus and methods of fabrication and use of highly effective laser-induced graphene (LIG) electrodes including for electrochemical sensing and catalysis. One example is a sensitive and label-free laser-induced graphene (LIG) electrode functionalized for a specific application. One example of functionalization with antibodies, an enzyme, or an ionophore to electrochemically quantify a target species The LIG electrodes were produced by laser induction on film having a carbon precursor (e.g. polyimide) in ambient conditions, and hence circumvent the need for high-temperature, vacuum environment, and metal seed catalysts commonly associated with graphene-based electrodes fabricated via chemical vapor deposition processes. These results demonstrate how LIG-based electrodes can be used for electrochemical sensing in general. Other examples of applications include, but are not limited to, ion-sensing, pesticide monitoring and detection, and water splitting, using the LIG-based electrode(s) adapted for those purposes.

The invention discloses an optical ion sensing membrane for detecting the pH, which comprises the following components in percentage by weight: 0.38 percent to 0.42 percent of ETH5418; 0.44 percent to 0.49 percent of sodium quadri (3,5-bis(trifluoro methyl)phenyl)borate; 2.09 percent to 2.14 percent of up-conversion nanorod; 33.13 percent to 33.16 percent of polrvinyl chloride; and the balance ofdi(2-ethyl-hexyl)sebacate or o-nitrophenyl octyl ether or dioctyl phthalate for compensating to 100 percent. The invention also discloses a preparation method of the optical ion sensing membrane and application of the sensing membrane to the pH detection. The optical ion sensing membrane for detecting the pH, which is disclosed by the invention, is excited by light with wavelength of 980nm, the light is transmitted in a near infrared region as well, and the sensor cannot be interfered by background absorption and background fluorescence. Moreover, relative to a conventional organic system, the system, namely the optical ion sensing membrane, has higher quantum yield and can generate high-strength fluorescence.

An inexpensive, high-performance pH sensor measure the surface of a solid substance in a simple manner, comprising an ion sensing part 2 which responds to pH, a reference electrode 3, a gel-form ion permeable substance 10, which has a predetermined pH value and covers the ion sensing part 2 and reference electrode 3, and a cover member 9, which houses the ion permeable substance 10 and has an opening 9a formed at a position near the abovementioned ion sensing part 2.

A potassium/sodium ion sensing device applying an extended-gate field effect transistor, which using an extended-gate ion sensitive field effect transistor (EGFET) as base to fabricate a potassium/sodium ion sensing device, using the extended gate of the extended-gate ion sensitive field effect transistor as a signal intercept electrode, and immobilizing the hydro-aliphatic urethane diacrylate (EB2001) intermixed with electronegative additive, potassium ionophore, sodium ionophore, and the like, to fabricate a potassium/sodium ion sensing electrode. The present invention utilizes the photocurability and good hydrophilicity of the hydro-aliphatic urethane diacrylate (EB2001), and fixes potassium/sodium ionophore, can obtain a non-wave filter, single-layer, stable signal potassium and sodium ion sensor. Thus, when the present invention is applied to measure the concentration of potassium/sodium ions in a sample, the mutual interference between potassium/sodium ion electrodes can be reduced, so the measured value can be more close to the actual value.

Present Invention discloses high efficiency selected development compound fluorine ion detection method and test paper based on identifying naked eye visual investigation combination. Said compound use 2, 4-binitro phenylhydrazones-4, 5-dihetero fluorenone ligand coordination as characteristic coordination compound, said compound selectivity detection to fluorine ion in 10-5concentration range, capable of using absorption photometry and naked eye visual colorimetry to detect. Discoloration test paper made from compound can detect fluorine ion concentration low to 1 ppm. Said inventive test paper has simple making, convenient detect, visual, in favor of habitualness detect of fluorine content in drinking water.

The invention discloses a method for high efficiency preparation of carbon quantum dots by using biomass soot, wherein the method comprises the following specific steps: 1, adding concentrated nitric acid and concentrated sulfuric acid or a mixture of the two components into soot obtained by burning biomass, and carrying out ultrasonic treatment for 1 h-5 h, to obtain a dispersion liquid of the soot; 2, carrying out heating treatment of the dispersion liquid of the soot for 10-36 h at the temperature of 80 to 120 DEG C, naturally cooling to room temperature, then placing the cooled product into ice water, adding ultra pure water, stirring, and adjusting the mixed solution to be neutral with K2CO3, to obtain a crude product; and 3, centrifuging the crude product to filter out a precipitate, carrying out grading dialysis of the filtrate by using dialysis bags with different cut-off molecular weights, concentrating dialysates of all parts, and thus obtaining carbon quantum dot solutions with different size ranges. The selected raw materials are low in price and stable in sources, the preparation process is simple, and obtained carbon quantum dots can emit yellow fluorescence, have high quantum yield, and are suitable for light electric conversion, biological imaging, ion sensing and other fields.

An ion sensing arrangement for a small internal combustion engine includes an ion sensor placed in the engine's combustion chamber to measure the conductivity of the combusted fuel-air mixture. Scaling circuitry, such as variable voltage divider circuitry, is connected to be in electrical communication with an output of the ion sensor. The scaling circuitry operates to adjust the output signal to a value appropriate for measurement. Preferably, the scaling circuitry adjusts the output signal based on a comparison with a reference value.