Nanomanufacturing(NM),developed over the past three decades,bridges nanosciencediscoveries tonanotechnology products by scaled-up,reliable,and cost-effective manufacturing materials,structures,devices,and systems at t...Nanomanufacturing(NM),developed over the past three decades,bridges nanosciencediscoveries tonanotechnology products by scaled-up,reliable,and cost-effective manufacturing materials,structures,devices,and systems at the nanoscale(1-100 nm).At this scale,physical and chemical properties of the materials and tools have been dominated by classical Newtonian mechanics,although quantum confinementeffects become increasinglyobservable.Anumber of top-down and bottom-up approaches were developed,including nanomechanical machining,nanolithography,energy beam machining,deposition and etching,nanoprinting,nano assembly,nano replication,etc.[1].These techniques enabled a range of applications from medical imaging and renewable energy to sensor devices and quantum computing.展开更多
The morphology of linear polybutadiene physisorbed on freshly cleaved mica from a dilute polymer solution is investigated through atomic force microscopy.A fine-structure study shows that the monolayer morphology in a...The morphology of linear polybutadiene physisorbed on freshly cleaved mica from a dilute polymer solution is investigated through atomic force microscopy.A fine-structure study shows that the monolayer morphology in air(after rapid solvent evaporation)depends strongly on the molecular weight(Mw)of the linear polymer,the adsorbed amount,and the conformation adopted by the adsorbed polymer chains under good solvent conditions.The dependence of the observed polymer structure on Mw is most significant for samples with high surface density,where the intermolecular interactions among the adsorbed polymers are important.For high surface density,the adsorbed polymers tend to aggregate and minimize unfavorable contacts with air for all of the different Mw samples,leading to an isotropic structural pattern.These structural phenomena with increasing surface density are explained on the basis of the intermolecular interactions of the adsorbed polymers under good solvent conditions,and after the abrupt solvent evaporation corresponding to poor solvent conditions.The experimental observations are further discussed using the results obtained from molecular dynamics simulations of a simple coarse-grained model.展开更多
文摘Nanomanufacturing(NM),developed over the past three decades,bridges nanosciencediscoveries tonanotechnology products by scaled-up,reliable,and cost-effective manufacturing materials,structures,devices,and systems at the nanoscale(1-100 nm).At this scale,physical and chemical properties of the materials and tools have been dominated by classical Newtonian mechanics,although quantum confinementeffects become increasinglyobservable.Anumber of top-down and bottom-up approaches were developed,including nanomechanical machining,nanolithography,energy beam machining,deposition and etching,nanoprinting,nano assembly,nano replication,etc.[1].These techniques enabled a range of applications from medical imaging and renewable energy to sensor devices and quantum computing.
基金the EPSRCDTA and the Institute of Materials and Processes,School of Engineering at the University of Edinburgh.
文摘The morphology of linear polybutadiene physisorbed on freshly cleaved mica from a dilute polymer solution is investigated through atomic force microscopy.A fine-structure study shows that the monolayer morphology in air(after rapid solvent evaporation)depends strongly on the molecular weight(Mw)of the linear polymer,the adsorbed amount,and the conformation adopted by the adsorbed polymer chains under good solvent conditions.The dependence of the observed polymer structure on Mw is most significant for samples with high surface density,where the intermolecular interactions among the adsorbed polymers are important.For high surface density,the adsorbed polymers tend to aggregate and minimize unfavorable contacts with air for all of the different Mw samples,leading to an isotropic structural pattern.These structural phenomena with increasing surface density are explained on the basis of the intermolecular interactions of the adsorbed polymers under good solvent conditions,and after the abrupt solvent evaporation corresponding to poor solvent conditions.The experimental observations are further discussed using the results obtained from molecular dynamics simulations of a simple coarse-grained model.
