Structural effects induced by dialysis-based purification of carbon nanomaterials  

作　　者：A.D.Veloso A.M.Ferraria A.M.Botelho do Rego A.S.Viana A.J.S.Fernandes A.J.Fielding R.A.Videira M.C.Oliveira 

机构地区：[1]CQ-VR and Chemistry Department,University of Tras-os-Montes e Alto Douro,5000-801,Vila Real,Portugal [2]BSIRG,iBB-Institute for Bioengineering and Biosciences,Department of Chemical Engineering,and Associate Laboratory i4HB-Institute for Health and Bioeconomy,Instituto Superior Tecnico,Universidade de Lisboa,1049-001,Lisbon,Portugal [3]Centro de Química Estrutural,Institute of Molecular Sciences,Departamento de Química e Bioquímica,Faculdade de Ci^encias,Universidade de Lisboa,Campo Grande,1749-016,Lisboa,Portugal [4]I3N and Physics Department,University of Aveiro,Campus de Santiago,3810-193,Aveiro,Portugal [5]Faculty of Science,Pharmacy and Biomolecular School,Liverpool John Moores University,United Kingdom [6]REQUIMTE/LAQV,Laboratorio de Farmacognosia,Departamento de Química,Faculdade de Farmacia,Universidade do Porto,4050-313,Porto,Portugal

出　　处：《Nano Materials Science》2024年第4期475-483,共9页纳米材料科学（英文版）

基　　金：FCT(Portugal's Foundation for Science and Technology)for financial support through the CQ-VR(UIDB/00616/2020,UIDP/00616/2020),CQE/Institute of Molecular Sciences(UIBD/00100/2020,UIPD/00100/2020 and LA/P/0056/2020),Institute for Bioengineering and Biosciences-iBB/Associate Laboratory Institute for Health and Bioeconomy-i4HB(UIDB/04565/2020,UIDP/04565/2020,and LA/P/0140/2020);FCT,MCTES,ESF,and EU through the individual research Ph.D.for the Ph.D.scholarship(SFRH/BD/138425/2018);FCT for funding through the Scientific Employment Stimulus—Institutional Call(Ref.CEECINST/00136/2021);the EPSRC funded National Research Facility(EP/W014521/1)。

摘　　要：Dialysis plays a crucial role in the purification of nanomaterials but its impact on the structural properties of carbon nanomaterials was never investigated.Herein,a carbon-based nanomaterial generated electrochemically in potassium phosphate buffer,was characterized before and after dialysis against pure water.It is shown that dialysis affects the size of the carbon domains,structural organization,surface functionalization,oxidation degree of carbon,and grade of amorphicity.Accordingly,dialysis drives the nanomaterial organization from discrete roundish carbon domains,with sizes ranging from 70 to 160 nm,towards linear stacking structures of small nanoparticles(<15 nm).In parallel,alcohol and ether(epoxide)surface groups evolve into more oxidized carbon groups(e.g.,ketone and ester groups).Investigation of the as-prepared nanomaterial by electron paramagnetic resonance(EPR)revealed a resonance signal consistent with carbon-oxygen centred radicals.Additionally,this study brings to light the selective affinity of the carbon nanomaterial under study to capture Na^(+)ions,a property greatly enhanced by the dialysis process,and its high ability to trap oxygen,particularly before dialysis.These findings open new perspectives for the application of carbon-based nanomaterials and raise awareness of the importance of structural changes that can occur during the purification of carbon-based nanomaterials.

关 键 词：NANOCARBON Surface functionalization NMR XPS Hydrophilic carbon PARAMAGNETIC 

分 类 号：TB383.1[一般工业技术—材料科学与工程]