4results about How to "Rapid Field Detection" patented technology

The application discloses an aggregation-induced emission metal organic framework, a preparation method thereof and fluorescent / colorimetric dual-mode intelligent detection for trace HCl. 2+ The aggregation-induced emission metal organic framework is prepared by providing Zn(NO3)3.6H2O as Zn 2+ , imidazole-2-formaldehyde and an AIE molecule HDBB as organic ligands, and through a solvothermal method to obtain ZIF-90-HDBB, which can change the aggregation state fluorescence from yellow green to orange red after being contacted with HCl gas; the ZIF-90-HDBB is uniformly loaded on cellulose filter paper to obtain a paper-based sensor for portable detection of HCl, and through combination with a color recognition APP of a smart phone, the HCl can be rapidly and sensitively detected on site in a fluorescent / colorimetric dual mode. Since the HDBB molecule is prone to protonation under acidic conditions, the fluorescence color changes, and therefore the material can be accurately and efficiently used for detection of acidic gas, and the material can be recycled.

The invention relates to the field of material mechanical property testing, and provides an in-service material property detection system based on an indentation method, comprising: an excitation module for applying a composite dynamic excitation load to a pressure head when the spherical pressure head is pressed into a to-be-detected material; the signal acquisition module is used for synchronously acquiring a dynamic load signal and a dynamic displacement signal in the pressing-in process of the pressing head; the data processing module is used for calculating an instantaneous phase difference according to the dynamic load signal and the dynamic displacement signal, constructing an evolution curve of the instantaneous phase difference along with the change of the pressure depth, and extracting a first characteristic depth, a second characteristic depth and a phase hardening index from the evolution curve; and the performance resolving module is used for calculating the elastic modulus and the yield strength of the to-be-tested material according to the first characteristic depth, the second characteristic depth, the phase hardening index and the mapping relation model. According to the method, the plastic hardening constitutive relation of the material does not need to be preset, rapid and micro-damage detection of the tensile property of the material can be achieved through single-time micron-order pressing-in, and the method is particularly suitable for field evaluation of in-service equipment.

This invention provides a colorimetric detection method for quercetin based on NH2-MIL-101-CuCo nanozymes. The method includes: preparing a first mixture by mixing NH2-MIL-101-CuCo nanozymes, TMB solution, and hydrogen peroxide solution with the sample to be tested, and a second mixture by mixing with a quercetin standard; reacting the mixture under the same reaction conditions to obtain absorbance values ​​A1 and A0 at predetermined wavelengths; determining the quercetin content in the sample based on A1 and linear regression curves of different concentrations of quercetin; the nanozyme is synthesized in one step via a hydrothermal method using copper chloride dihydrate, cobalt chloride hexahydrate, 2-aminoterephthalic acid, and sodium hydroxide. The method utilizes hydrogen bonds formed by the active hydrogen atoms in the nanozyme and the hydroxyl groups in quercetin to specifically recognize and adsorb quercetin, thus enabling the detection of quercetin.

The invention develops a dual-mode optical sensor based on CuO2 nanodots. The dual-mode optical sensor is mainly applied to detection and research of a Warburg effect of gastric cancer. The CuO2 nanodots can catalyze the reaction of o-phenylenediamine (OPD) and hydrogen peroxide (H2O2), so that the color of the solution is changed from colorless to yellow along with the increase of absorbance and fluorescence intensity. Based on the reaction, a dual-mode sensor is designed, and the activity of lactic acid and lactate oxidase is synchronously detected through colorimetry and fluorescence. In the process of catalyzing lactic acid to generate H2O2 by lactic acid oxidase, the generated H2O2 promotes the color of a solution to change remarkably, so that the sensitive detection of the activity of lactic acid and oxidase thereof is indirectly realized. As the Warburg effect of the gastric cancer causes rise of the lactic acid level, the sensor can effectively associate the lactic acid level with the metabolic characteristics of the gastric cancer. In addition, in combination with an RGB colorimetric analysis technology, a smart phone is used for capturing color changes and carrying out image quantitative analysis, a portable, low-cost and high-sensitivity detection system is formed, and the application blank of the CuO2 nanodots in the field is filled up.