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A new peptide-mediated COF nanocatalytic amplification SERS quantitative assay for ultratrace Cu2+
Yiyi Shu,Shengfu Zhi,Sha Li,Aihui Liang,Zhiliang Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Peptides are an important recognition element for small molecules and have been used in the field of biologicalanalysis. However, it has been rarely reported that a novel method combining peptides as recognitionelements with covalent organic framework (COF) as catalytic amplification signal to constructhighly sensitive and selective three-mode molecular spectroscopy. In this paper, high catalytic and stablethree COFs were prepared, and the catalysis of the new indicator nanoreaction of HAuCl4-sodiumformate(Fo) was studied by molecular spectral slope procedure. The produced gold nanoparticles (AuNPs) exhibita strong resonance Rayleigh scattering (RRS) peak at 370 nm and surface plasmon resonance absorption(Abs) peak at 540 nm. In the presence of molecular probes, a strongest surface-enhanced Raman scattering(SERS) peak was generated at 1617 cm1. Combining the COFTpBD amplification indicator reactionwith specific peptide (PT) reaction of Cu2+, a novel, sensitive and selective SERS/RRS/Abs assay platformwas established, with a SERS linear range of 0.005–0.115 nmol/L Cu2+. In addition, the two workingcurves of lg[Cu2+] vs SERS and [Cu2+] vs SERS intensity, and the nanocatalytic mechanism were discussed.
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Full-range plasticity of novel high-performance low-cost stainless steel QN1803
Yiyi Zhou,Kim Eng Chouery,Jiang-Yue Xie,Zhan Shu,Liang-Jiu Jia 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.6
This paper aims to investigate cyclic plasticity of a new type of high-performance austenitic stainless steel with both high strength and high ductility. The new stainless steel termed as QN1803 has high nitrogen and low nickel, which leads to reduction of cost ranging from 15% to 20%. Another virtue of the new material is its high initial yield strength and tensile strength. Its initial yield strength can be 40% to 50% higher than conventional stainless steel S30408. Elongation of QN1803 can also achieve approximately 50%, which is equivalent to the conventional one. QN1803 also has a corrosion resistance as good as that of S30408. In this paper, both experimental and numerical studies on the new material were conducted. Full-range true stress-true strain relationships under both monotonic and cyclic loading were obtained. A cyclic plasticity model based on the Chaboche model was developed, where a memory surface was newly added and the isotropic hardening rule was modified. A user-defined material subroutine was written, and the proposed cyclic plasticity model can well evaluate full-range hysteretic properties of the material under various loading histories.
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