It is investigated to synthesis of Ag nanoparticles by presence the synthetic polymer poly-N-vinylpyrrolidone. It was determined with X-ray analyses that the size ofnanoparticles changed between 18-42 nm. Then, the au...It is investigated to synthesis of Ag nanoparticles by presence the synthetic polymer poly-N-vinylpyrrolidone. It was determined with X-ray analyses that the size ofnanoparticles changed between 18-42 nm. Then, the authors studied sorption process of doxorubicine by silver nanocomposites and investigated chemical interaction between antibiotic and poly-N-vinyplyrrolidone with UV-VIS （ultraviolet visible） and FT-IR （Fourier transform infrared） spectroscopy. It is shown that formation of the nanoparticles doxorubicin complex mainly occurs in the 190-208 nm wavelengths on polymers 〉C=O functional groups. Also, the four main absorbing peaks of doxorubicin--234, 253, 288 and 495 nm undergo chemists shift （A2 = 12-15 nm）. When increases to pH = 7-8, the size of Ag-doxorubicin particles decreases. It is determined that the 410 nm absorption peak of Ag nanoparticles undergo 409-418 nm interval and the 3,500, 1,600, 1,645 and 1,190 sm^-1 absorption lines of PVPr （polymer poly-N-vinylpyrrolidone） slightly altered.展开更多
Conductive and adhesive hydrogels are promising materials for designing bioelectronics.To satisfy the high conductivity of bioelectronic devices,metal nanomaterials have been used to fabricate composite hydrogels.Howe...Conductive and adhesive hydrogels are promising materials for designing bioelectronics.To satisfy the high conductivity of bioelectronic devices,metal nanomaterials have been used to fabricate composite hydrogels.However,the fabrication of a conductive-nanomaterial-incorporated hydrogel with high performance is a great challenge because of the easy aggregation nature of conductive nanomaterials making processing difficult.Here,we report a kind of adhesive aero-hydrogel hybrid conductor(AAHC)with stretchable,adhesive and anti-bacteria properties by in situ formation of a hydrogel network in the aerogel-silver nanowires(AgNWs)assembly.The AgNWs with good conductivity are wellintegrated on the inner-surface of shape-memory chitosan aerogel,which created a conductive framework to allow hydrogel back-filling.Reinforcement by the aerogel-silver makes the hybrid hydrogel tough and stretchable.Functional groups from the hydrogel allow strong adhesion to wet tissues through molecular stitches.The inherent bacteria-killing ability of silver ions endows the conductive hydrogel with excellent anti-bacteria performance.The proposed facile strategy of aerogel-assisted assembly of metal nanomaterials with hydrogel opens a new route to incorporate functional nanoscale building blocks into hydrogels.展开更多
Biocompatible carbon-spheres-based nanocomposites exhibit great potential in biomedical and clinical applications. In this contribution we report the first green photochemical synthesis of carbon spheres through in-si...Biocompatible carbon-spheres-based nanocomposites exhibit great potential in biomedical and clinical applications. In this contribution we report the first green photochemical synthesis of carbon spheres through in-situ enwrapping around silver nanoparticles(CS–Ag NPs). Since mesoporous carbon spheres can provide the location for combining Ag NPs and other agents, one-step synthesis of glutathione-stabilized CS–Ag NPs could be readily realized by photoreduction. TEM characterization of CS–Ag NPs nanocomposites illustrates that Ag NPs were superbly wrapped inside the carbon spheres and also adhered to the surfaces of the carbon spheres. These porous CS–Ag NPs show excellent fluorescence and effective antibacterial efficiency, exhibiting ideal lengthened activities against Escherichia coli and Staphylococcus aureus compared with bare Ag NPs. The relevant rationale behind it could be attributed to the fact that CS–Ag NPs nanocomposites can provide some excellent niches for the durable and slow release of silver ions. This raises the possibility of promising applications of CS–Ag NPs nanocomposites as excellent antibacterial agents for the efficient monitoring of some disease-related bacteria.展开更多
文摘It is investigated to synthesis of Ag nanoparticles by presence the synthetic polymer poly-N-vinylpyrrolidone. It was determined with X-ray analyses that the size ofnanoparticles changed between 18-42 nm. Then, the authors studied sorption process of doxorubicine by silver nanocomposites and investigated chemical interaction between antibiotic and poly-N-vinyplyrrolidone with UV-VIS （ultraviolet visible） and FT-IR （Fourier transform infrared） spectroscopy. It is shown that formation of the nanoparticles doxorubicin complex mainly occurs in the 190-208 nm wavelengths on polymers 〉C=O functional groups. Also, the four main absorbing peaks of doxorubicin--234, 253, 288 and 495 nm undergo chemists shift （A2 = 12-15 nm）. When increases to pH = 7-8, the size of Ag-doxorubicin particles decreases. It is determined that the 410 nm absorption peak of Ag nanoparticles undergo 409-418 nm interval and the 3,500, 1,600, 1,645 and 1,190 sm^-1 absorption lines of PVPr （polymer poly-N-vinylpyrrolidone） slightly altered.
基金the National Natural Science Foundation of China(51732011,51702310,21431006,and 21761132008)the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(21521001)+2 种基金the Key Research Program of Frontier Sciences,CAS(QYZDJ-SSW-SLH036)the Users with Excellence and Scientific Research Grant of Hefei Science Center of CAS(2015HSC-UE007)Anhui Provincial Natural Science Foundation(1808085ME115)。
文摘Conductive and adhesive hydrogels are promising materials for designing bioelectronics.To satisfy the high conductivity of bioelectronic devices,metal nanomaterials have been used to fabricate composite hydrogels.However,the fabrication of a conductive-nanomaterial-incorporated hydrogel with high performance is a great challenge because of the easy aggregation nature of conductive nanomaterials making processing difficult.Here,we report a kind of adhesive aero-hydrogel hybrid conductor(AAHC)with stretchable,adhesive and anti-bacteria properties by in situ formation of a hydrogel network in the aerogel-silver nanowires(AgNWs)assembly.The AgNWs with good conductivity are wellintegrated on the inner-surface of shape-memory chitosan aerogel,which created a conductive framework to allow hydrogel back-filling.Reinforcement by the aerogel-silver makes the hybrid hydrogel tough and stretchable.Functional groups from the hydrogel allow strong adhesion to wet tissues through molecular stitches.The inherent bacteria-killing ability of silver ions endows the conductive hydrogel with excellent anti-bacteria performance.The proposed facile strategy of aerogel-assisted assembly of metal nanomaterials with hydrogel opens a new route to incorporate functional nanoscale building blocks into hydrogels.
基金supported by the National Basic Research Program of China(2010CB732404)the National Natural Science Foundation of China(81325011,21327902,21175020)+1 种基金the National High Technology Research and Development Program of China(2012AA022703)the Suzhou Science&Technology Major Project(ZXY2012028)
文摘Biocompatible carbon-spheres-based nanocomposites exhibit great potential in biomedical and clinical applications. In this contribution we report the first green photochemical synthesis of carbon spheres through in-situ enwrapping around silver nanoparticles(CS–Ag NPs). Since mesoporous carbon spheres can provide the location for combining Ag NPs and other agents, one-step synthesis of glutathione-stabilized CS–Ag NPs could be readily realized by photoreduction. TEM characterization of CS–Ag NPs nanocomposites illustrates that Ag NPs were superbly wrapped inside the carbon spheres and also adhered to the surfaces of the carbon spheres. These porous CS–Ag NPs show excellent fluorescence and effective antibacterial efficiency, exhibiting ideal lengthened activities against Escherichia coli and Staphylococcus aureus compared with bare Ag NPs. The relevant rationale behind it could be attributed to the fact that CS–Ag NPs nanocomposites can provide some excellent niches for the durable and slow release of silver ions. This raises the possibility of promising applications of CS–Ag NPs nanocomposites as excellent antibacterial agents for the efficient monitoring of some disease-related bacteria.
