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A Highly Selective and Sensitive Fluorescent Turn-Off Probe for Al3+ Based on Polypyrimidine
Yuemaierjiang Maimaiti,Xieraili Maimaitiyiming 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
The polyfluorene copolymers with different pyrimidine content has been synthesized and characterized by1HNMR, 13CNMR and FT-IR spectrum. The aggregation, acidochromicity, and metallochromicity of copolymers has beeninvestigated. The pyrimidine content of polymer has great affect in acidochromic properties for methanesulfonic acid (MSA)and selectivity for Al3+. The colour change of copolymer/Al3+ complexes can be detected by the naked eye. The copolymersare found to be good linearly proportional to the concentration of Al3+ ions in a range from 1.0×10-6 to 1.0×10-3 M with adetection limit of 1.895×10-8 M. The binding constant of the copolymer/Al3+ complexes was calculated using Benesi-Hildebrand equation and was found to be 8.95×105 M-1. The XPS spectroscopy, SEM micrograph and the EDS analysisreveal that the metal ion coordination occurs on the pyrimidine ring in the copolymers. This copolymer will be widely usedfor detection of protons and metals as fluorescent sensors.
Yuemaierjiang Maimaiti,Naziermu Dongmulati,Salamaiti Baikeri,Abulajiang Maimaiti,Rukeya Maitisidike,Xieraili Maimaitiyiming 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
A process for controlling the size of Single-walled carbon nanotubes (SWCNTs) sorting was achieved by combining various centrifugation speeds with polypyrimidine’s properties of dispersion and release SWCNTs upon acid treatment. At first, the SWCNTs wrapped by polypyrimidine were sperated into different size by centrifugating at various speeds. Then, these size-selected hybrids were treated with H2SO4 (98 %) to release free SWCNTs from hybrids, meanwhile the copolymer was collected for reuse. The purity of the released size-controlled SWCNTs was found to be higher than the commercial SWCNTs. The simple synthetic procedure of the copolymer, the low cost of H2SO4 and low centrifugation speed allow the process of size-controlled SWCNTs sorting to more practical applications and industrial scaling up.