7 results about "Achirality" patented technology

This invention relates to the field of electrocatalyst technology, and in particular to a chiral CoFe-based oxygen evolution electrocatalyst, its preparation method, and its application. Iron salts, cobalt salts, and chiral tartaric acid are dissolved together in N,N-dimethylformamide solvent to form a homogeneous mixed solution. Hydrazine hydrate is added to the mixed solution and thoroughly mixed. The solution is then transferred to a high-pressure reactor and subjected to a solvothermal reaction at a set temperature to obtain a nanocatalyst precursor. The nanocatalyst precursor is then subjected to centrifugation, washing, drying, and vacuum calcination to obtain the product. This method successfully prepares a chiral CoFe-based nanocatalyst through the inductive effect of chiral tartaric acid, combined with a specific solvothermal reaction and subsequent heat treatment process. This chiral CoFe-based electrocatalyst exhibits significantly enhanced catalytic activity and stability in the oxygen evolution electrocatalytic reaction, demonstrating superior electrochemical performance compared to achiral catalysts.

This invention discloses a method for producing high-purity (1R,2S,5R)-WS-3, comprising the following steps: using a mixture of menthol containing eight stereoisomers or naturally extracted menthol as raw material, and reacting it with diethylamine and phosgene under solvent-free conditions at 55-65°C; using a non-chiral adsorbent to separate six diastereomers of (1R,2S,5R)-WS-3 from the obtained WS-3 mixture, and then using a chiral adsorbent to separate the remaining two enantiomers, thus obtaining high-purity (1R,2S,5R)-WS-3. This invention achieves the production of high optical purity (1R,2S,5R)-WS-3 menthol amide cooling agent under mild operating conditions, and has significant industrial application value for the efficient production and quality upgrading of cooling agents.

This invention belongs to the field of chemical energy storage battery technology, specifically providing a chiral hydrogel electrolyte based on supramolecular assembly and its preparation method, to solve the problems of disordered ion channels and insufficient free water binding in traditional achiral gel electrolytes. This invention introduces a single, pure-configuration chiral guest molecule into an achiral polymer substrate, forming a supramolecular chiral membrane based on stereo-oriented supramolecular assembly. After swelling and saturation in an aqueous electrolyte, a chiral hydrogel electrolyte is obtained. The chiral guest molecule, acting as a topological guest, reshapes the polymer topology network, forming a stereo-oriented network, causing a sudden leap in the gel's energy storage modulus, thus providing resistance to dendrite penetration. Simultaneously, the chiral guest molecule can achieve interfacial stability at the negative electrode, further suppressing dendrite formation at the negative electrode. Furthermore, the stereo-oriented network can significantly limit the activity of free water molecules, eliminating the erosion of the vanadium cathode by free water molecules and vanadium dissolution.

This invention discloses a method for detecting 99 achiral / chiral endocrine disruptors in urine based on a dual-column coupled analysis system, belonging to the field of pollutant monitoring and analysis technology. The method involves a single pretreatment of the urine sample, including formic acid-acetonitrile extraction and ethylenediamine-N-propyl silica gel purification. A dual-column coupled analysis mode is then used, with a C18 column simultaneously quantifying the total concentration of 93 achiral endocrine disruptors (EDCs) and 6 chiral pesticides. The chiral column yields the R / S enantiomer signal intensity ratio, and the content of each enantiomer is calculated using a "total-proportional conversion" model. This invention achieves, for the first time, a unified detection system for achiral and chiral substances, eliminating the need for a single enantiomer standard; accurate quantification can be achieved using only racemic mixtures, effectively avoiding the direct quantitative bias of chiral columns. The method has a limit of quantification as low as 0.25 μg / L, is simple to operate, low in cost, and has good reproducibility, providing an efficient and reliable analytical tool for population exposure monitoring and chiral selective metabolism research.

The application discloses a water-soluble achiral rare earth tetrahedral cage CPL probe for recognition of mercapto amino acids and a preparation method thereof, and relates to a CPL probe for recognition of mercapto amino acids and a preparation method thereof. The application is aimed at solving the problems that water solubility and functional cavities are difficult to balance, and specific recognition ability is limited in the detection of mercapto amino acids by using existing supramolecular cage optical probes. The water-soluble achiral rare earth tetrahedral cage CPL probe for recognition of mercapto amino acids has high water solubility, strong CPL signal and high selective rare earth tetrahedral cage probe, realizes efficient recognition and quantitative detection of mercapto amino acids such as D-penicillamine, and has the advantages that Eu4L4 is an achiral rare earth tetrahedral cage, the number of aldehyde groups is multiplied due to the tetrahedral structure, excellent circularly polarized luminescence performance is exhibited, high-precision distinction between mercapto amino acids and non-mercapto amino acids is successfully realized, and the selectivity of detection is remarkably improved.

The application aims to provide an organic-inorganic hybrid chiral film and a preparation method thereof. The organic-inorganic hybrid chiral film comprises at least two hybrid orientation films, the hybrid orientation film comprises a flexible polymer film and one-dimensional metal nanomaterials distributed on the surface of the flexible polymer film and arranged in an orientation manner, and the flexible polymer film is an achiral polymer film; and each layer of the hybrid orientation film is arranged in a preset deflection angle along the orientation axis direction of the one-dimensional metal nanomaterials. The obtained chiral film is not dependent on a chiral template, has high CD intensity, high g-factor and covers ultraviolet-visible-near infrared super wide wave bands, and the preparation method has low cost and strong universality.

The application provides an optically active polydiacetylene film and a preparation method and application thereof. The preparation method comprises the following steps: forming a nanowire array on a substrate, which comprises a first nanowire layer and a second nanowire layer arranged in sequence in a direction away from the substrate, and the nanowires contained in the first and second nanowire layers have a non-zero torsion angle; depositing an achiral diacetylene monomer on the nanowire array, removing the nanowire array to obtain a diacetylene monomer crystal layer; and irradiating the diacetylene monomer crystal layer with ultraviolet light to make it polymerize to form a helical polydiacetylene chain, thereby obtaining the optically active polydiacetylene film. The method provided by the application forms stereoregulated diacetylene crystals through the heteroepitaxy effect of the twisted stacked nanowire array, and only needs to be irradiated with ultraviolet light to initiate the asymmetric polymerization of diacetylene, thereby solving the problems that the crystal structure is difficult to be regulated as required and an exogenous chirality needs to be introduced in the prior art.