SOLID-STATE NUCLEAR MAGNETIC RESONANCE (ssNMR) METHOD FOR DETECTING HYDROGEN BOND STRUCTURE

    公开(公告)号:US20230228696A1

    公开(公告)日:2023-07-20

    申请号:US17951411

    申请日:2022-09-23

    CPC classification number: G01N24/087

    Abstract: An experimental technology for detecting a hydrogen bond based on an ssNMR technology includes: (1) exciting a 1H nucleus of an RNA sample with a π/2 pulse; (2) applying two π pulses every half rotation period on an X_nucleus of the RNA sample; (3) applying a π pulse on the 1H nucleus of the RNA sample; (4) applying two π pulses every half rotation period on the X nucleus of the RNA sample; (5) applying a 90° pulse on 1H and X atoms of the RNA sample; (6) recording a chemical shift of X in indirect dimension; (7) applying the 90° pulse on the 1H and X nuclei of the RNA sample; (8) repeating steps 2, 3, and 4; and (9) collecting the 1H signal in direct dimension; where X is selected from the group consisting of 15N and 13C.

    MULTI-STABLE AND ERASABLE ANTI-COUNTERFEITING TECHNOLOGY WITH CONTROLLED REFLECTION COLOR AND APPLICATION THEREOF IN OPTICAL CODING

    公开(公告)号:US20220335443A1

    公开(公告)日:2022-10-20

    申请号:US17311378

    申请日:2020-10-12

    Abstract: The present disclosure discloses a novel multi-stable and erasable anti-counterfeiting technology with controlled reflection color and the application thereof in optical coding. The method and use are characterized by high thermal stability and robust fatigue resistance, and the realization thereof relies on the material system composed of an intrinsic chiral diarylethene molecule based on steric hindrance ethene bridge and a liquid crystal (LC) material disclosed herein. The diarylethene based on steric hindrance ethene bridge has the following structural feature: The material system composed of a diarylethene compound based on steric hindrance ethene bridge and an LC can be prepared by a simple preparation process from cheap raw materials, can achieve a wide spectral color adjustment range, and has excellent thermal stability and fatigue resistance, which is expected to be further widely used in the fields of dual erasable anti-counterfeiting and optical information encoding with high thermal stability and strong fatigue resistance.

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