What is the most favorite and original chemistry developed in your research group?Ring-opening polymerization-induced self-assembly of N-carboxyanhydrides(NCA-PISA),and fusion-induced particle assembly(FIPA).How do yo...What is the most favorite and original chemistry developed in your research group?Ring-opening polymerization-induced self-assembly of N-carboxyanhydrides(NCA-PISA),and fusion-induced particle assembly(FIPA).How do you get into this specific field?Could you please share some experiences with our readers?NCA-PISA was developed to solve the biodegradability problem of nanoparticles by traditional PISA,while FIPA was inspired by nature.展开更多
Integrating catalytic reactions with molecular assembly is a promising means of achieving controllable supramolecular polymerization.We report herein a novel and controllable method for in situ supramolecular polymeri...Integrating catalytic reactions with molecular assembly is a promising means of achieving controllable supramolecular polymerization.We report herein a novel and controllable method for in situ supramolecular polymerization via organometallic-catalyzed macromolecular metamorphosis.To this end,covalent polymers with polypentenamer backbones and pendant supramolecular motifs are designed and synthesized.By depolymerizing the polymers with Grubbs catalysts,the supramolecular motifs can be gradually released from the polymers to the solution.Supramolecular polymerization occurs when a critical concentration is reached.The supramolecular polymerization process was readily controlled by varying the rate of the depolymerization reaction.This work presents a novel approach that uses organometallic catalysis to transform covalent polymers into supramolecular polymers.It offers a new means of constructing complex molecular systems in a controllable manner.展开更多
Alginate biopolymer from Tropicalgin C302245 was studied by means of piezoresponse force microscopy imaging, scanning electron microscopy, powder X-rays, infrared spectroscopy and computer simulations. Local piezoresp...Alginate biopolymer from Tropicalgin C302245 was studied by means of piezoresponse force microscopy imaging, scanning electron microscopy, powder X-rays, infrared spectroscopy and computer simulations. Local piezoresponse force microscopy images show possible ferroelectric domains detected in the out of plane mode and these results are confirmed by the second harmonic generation analysis. Alginate powder is composed by diatom frustules containing a cristobalite-like compound, amorphous silica and chitin. The experimental results are explained by MM+ and PM3 computer simulations that establish that the self-assembly of the alginate molecules enhance the polarization increasing the molecular collective dipole moment. Alginate molecular properties might open interesting possibilities for organic technological applications.展开更多
A novel supramolecular graft copolymer （SGP） composed of viologen-containing copolymer （P（DMA-co- diEV）） as the main chain and Np ended PNIPAM （Np-PNIPAm） as the grafts is prepared （DMA： N,N- dimethylacryami...A novel supramolecular graft copolymer （SGP） composed of viologen-containing copolymer （P（DMA-co- diEV）） as the main chain and Np ended PNIPAM （Np-PNIPAm） as the grafts is prepared （DMA： N,N- dimethylacryamide, diEV： ethylviologen dimer, Np： naphthalene, PNIPAM： poly（N-isopropylacrylamide））. The grafting is based on the triple complexation among a host of cucurbit[8]uril （CB[8]） and two guests of diEV and Np, which is characterized by UV-vis spectra and ITC. Temperature sensitive property of PNIPAm moiety allows SGP to self-assemble into non-covalently connected micelle （NCCM） at high temperature. The micelles are sensitive to reducing agents, for example Na2S203, which breaks the current inclusion complex pair and induces aggregation.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.21925505,52003195,and 22101207)Shanghai International Scientific Collaboration Fund(No.21520710100)+1 种基金the China Postdoctoral Science Foundation(Nos.2019M661614 and 2020M671197)J.D.is a recipient of the National Science Fund for Distinguished Young Scholars.
文摘What is the most favorite and original chemistry developed in your research group?Ring-opening polymerization-induced self-assembly of N-carboxyanhydrides(NCA-PISA),and fusion-induced particle assembly(FIPA).How do you get into this specific field?Could you please share some experiences with our readers?NCA-PISA was developed to solve the biodegradability problem of nanoparticles by traditional PISA,while FIPA was inspired by nature.
基金We gratefully acknowledge the financial support from National Key R&D Program of China(grant no.2021YFA1501600)National Natural Science Foundation of China(grant no.21901077)+2 种基金Natural Science Foundation of Guangdong Province(grant no.2016ZT06C322)Open Project of State Key Laboratory for Supramolecular Structure and Materials(grant no.SKLSSM2021012)the Research Fund Program of Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices(grant no.2019B121203003).
文摘Integrating catalytic reactions with molecular assembly is a promising means of achieving controllable supramolecular polymerization.We report herein a novel and controllable method for in situ supramolecular polymerization via organometallic-catalyzed macromolecular metamorphosis.To this end,covalent polymers with polypentenamer backbones and pendant supramolecular motifs are designed and synthesized.By depolymerizing the polymers with Grubbs catalysts,the supramolecular motifs can be gradually released from the polymers to the solution.Supramolecular polymerization occurs when a critical concentration is reached.The supramolecular polymerization process was readily controlled by varying the rate of the depolymerization reaction.This work presents a novel approach that uses organometallic catalysis to transform covalent polymers into supramolecular polymers.It offers a new means of constructing complex molecular systems in a controllable manner.
文摘Alginate biopolymer from Tropicalgin C302245 was studied by means of piezoresponse force microscopy imaging, scanning electron microscopy, powder X-rays, infrared spectroscopy and computer simulations. Local piezoresponse force microscopy images show possible ferroelectric domains detected in the out of plane mode and these results are confirmed by the second harmonic generation analysis. Alginate powder is composed by diatom frustules containing a cristobalite-like compound, amorphous silica and chitin. The experimental results are explained by MM+ and PM3 computer simulations that establish that the self-assembly of the alginate molecules enhance the polarization increasing the molecular collective dipole moment. Alginate molecular properties might open interesting possibilities for organic technological applications.
基金Ministry of Science and Technology of China(Nos. 2011CB932503 and 2009CB930402)National Natural Science Foundation of China(No.91227203) are acknowledged for their financial support
文摘A novel supramolecular graft copolymer （SGP） composed of viologen-containing copolymer （P（DMA-co- diEV）） as the main chain and Np ended PNIPAM （Np-PNIPAm） as the grafts is prepared （DMA： N,N- dimethylacryamide, diEV： ethylviologen dimer, Np： naphthalene, PNIPAM： poly（N-isopropylacrylamide））. The grafting is based on the triple complexation among a host of cucurbit[8]uril （CB[8]） and two guests of diEV and Np, which is characterized by UV-vis spectra and ITC. Temperature sensitive property of PNIPAm moiety allows SGP to self-assemble into non-covalently connected micelle （NCCM） at high temperature. The micelles are sensitive to reducing agents, for example Na2S203, which breaks the current inclusion complex pair and induces aggregation.
文摘以天然生物大分子鞣花酸(EA)为有机配体,Zn(CH_3COO)_2·2H_2O为锌源,N-甲基吡咯烷酮为溶剂,在室温下经超分子自组装形成金属生物大分子配合物(Zn EA)前驱体,再经碳化制备了分级多孔碳球.研究了不同碳化温度和酸洗处理过程对多孔碳球的结构、形貌、比表面积和电化学储能的影响.结果表明,在惰性气氛下,1000℃下碳化制备的多孔碳材料(C-Zn EA-1000)的比表面积高达1238 m^2/g,最可几孔径分布约为4 nm;在6 mol/L KOH电解液中,扫描速率为5 m V/s时比电容为216 F/g.当扫描速率由5 m V/s增加到100 m V/s时,其比电容保持率为84.67%,显示了优异的倍率特性.在1 A/g的电流密度下,经过5000周充放电循环后比电容的损失仅为3%,具有优异的循环稳定性.
