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Contact

3M-NANO 2019 Secretariat:

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3m.nano.secretariat@gmail.com

Phone: +86 431 85582926
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  Keynote Speakers  
 

*The list of Keynote speakers is based on the alphabetical order of family names

 

 

F. John Burpo

Professor

Head of Department and Professor U.S. Military Academy

Army Branch: Field Artillery
United States Military Academy

USA

Personal homepage

 

Title: Salt-Templated Noble Metal Macrobeams

Abstract: Challenge. Multi-metallic and alloy nanomaterials enable a broad range of catalytic applications with high surface area and tuning reaction specificity through the variation of metal composition. The ability to synthesize these materials as three-dimensional nanostructures enables control of surface area, pore size and mass transfer properties, electronic conductivity, and ultimately device integration. Approach. To address this challenge, the use of insoluble salt needles precipitated from oppositely charged square planar noble metal ions as templates for the electrochemical reduction of nanostructured porous macrobeams has been demonstrated in several studies. Salt precursors formed from the precipitation of square planar ions resulted in short- and long-range ordered crystals on the order of 10’s to 100’s of micrometers that, when reduced in solution, form macrobeams or nanofoams that can be dried or pressed into freestanding monoliths or films. This approach was used to synthesize platinum, bi-metallic platinum-palladium, and tri-metallic goldcopper-palladium macrobeams, as well as gold-copper nanofoams. Results. The nanostructure of the macrobeam sidewalls was found to depend on the metal composition, as well as the reducing agent used. Nanoparticles and nanofibrils comprising macrobeam sidewalls ranged from approximately 5 – 20 nm and resulted in high specific electrochemically active surface areas. Applications and future work. The use of salt-template precursors is envisioned as a synthesis route to numerous metal and multi-metallic nanostructures, to include transition metals, for catalytic, energy storage, and sensing applications.


 

Xi Chen

Assistant Professor

CUNY Advanced Science Research Center

Department of Chemical Engineering
The City College of New York

USA

Personal homepage

 

Title: Nanostructured Water-responsive Materials for Evaporation Energy Harvesting

Abstract: Natural evaporation involves water absorbing heat and vaporizing from higher chemical potential to lower chemical potential. While this process could involve a significant amount of energy transfer due to water’s large latent heat of vaporization, the energy of natural evaporation remains untapped. Our recent progress in nanostructured water-responsive materials, which swell and shrink in response to changes in relative humidity, has enabled the development of evaporation energy harvesting devices that can directly convert evaporation energy into mechanical energy as well as to electricity. While such energy harvesting technique is still in its early stage, theoretical studies have predicted a great potential of this energy source. Here, motivated by these recent developments, we discuss our current development of water-responsive materials and evaporation harvesting devices, as well as the scientific and technical challenges of improving their overall energy conversion efficiency for practical applications.


 

Xiaodong Chen

Professor

School of Materials Science and Engineering

Nanyang Technological University

Singaore

Personal homepage

 

Title:

Abstract:


 

Sonia Antoranz Contera

Professor 


Clarendon Laboratory

Department of Physics
University of Oxford

United Kingdom

Personal homepage

 

Title:

Abstract:


 

Baohua Jia

Associate Professor

Centre for Micro-Photonics, Faculty of Science, Engineering and Technology

Swinburne University of Technology

Melbourne, Australia

Personal homepage

 

Title:

Abstract:


 

Yaroslav Filinchuk

Professor of structural chemistry


Molecules, Solids and Reactivity (MOST)

Institute of Condensed Matter and Nanosciences (IMCN)
Université Catholique de Louvain (UCL)

Belgium

Personal homepage

 

Title: Gas adsorption in a small pore hydride: microscopic and macroscopic characterization by in situ diffraction

Abstract: We investigated an interaction of porous γ-Mg(BH4)2 [1] with small gas molecules, using neutron powder diffraction to accurately localize the guests at low temperatures and synchrotron X-ray powder diffraction to collect data along the adsorption isobars. The latter allows to study structural changes with pressure and temperature variation, giving insight into guest-host and guest-guest interactions, as well as to extract relevant thermodynamic parameters.
I will discuss the guest-host and guest-guest interactions, size effects, the role of hydridic hydrogen in physisorption, reactivity between the guest and the host. The effect of the probe size on the capacity and location of the guest molecules is remarkable in this small pore system. While typically each pore can be occupied by one of two guests, the amount of hydrogen that can be loaded reaches up to 5 molecules per pore (one pore in two, given the geometrical proximity), yielding the total capacity of 2.33 H2 molecules per Mg atom.

We also report on sub-second diffraction experiments on gas absorption by γ-Mg(BH4)2. We resolve the contributions of two kinetic barriers: most likely, the first is via Kr diffusion along the pore 1-D channels of the crystal structure and the second mechanism is through the interchannel aperture window.


 

Peer Fischer

Professor 

Max Planck Research Group Leader

Max Planck Institute for Intelligent Systems
University of Stuttgart

Germany

Personal homepage

 

Title:

Abstract:


 

Qiang He

Professor

Micro/Nanotechnology Research Center

Harbin Institute of Technology
China

 

Personal homepage

 

Title: Self-propelled swimming nanomachines for biomedical applications

Abstract: Current drug nanocarriers have potential to perform targeted drug delivery since they can achieve longer systemic circulation so that more drugs can be deposited at the tumor site through the enhanced permeability and retention (EPR) effect. Although various nanocarriers have been successfully used to deliver drugs, the targeting ratios are still very low since they cannot actively seek the tumor site and also lack a propelling force to penetrate the tumor beyond their normal diffusion limit. Inspired by natural swimmers (e.g. bateria), our group focuses on the design of synthetic swimming nanomachines which have ability of converting chemical energy or various physical stimuli into autonomous motion in fluids. These as-assembled nanomachines are able to be served as both autonomous motor and smart cargo, performing drug loading, targeted transportation and remote controlled release in the vicinity of cells and tissues in an organism. Such swimming nanomachines may provide a new trend in the design of next-generation drug delivery for actively seeking sites of diseases and targeted drug transport.


 

Alexander M. Leshansky

Associate Professor 

Department of Chemical Engineering

Technion
Israel Institute of Technology

Israel

Personal homepage

 

Title: Planar magnetic nanomachines: role of symmetry and controlled propulsion

Abstract: Steering of nano-/microhelices by a rotating magnetic field is considered a promising technique for controlled navigation of tiny objects through viscous fluidic environments. It was recently demonstrated that simple geometrically achiral planar structures can also be steered quite efficiently ‎[1]. Such planar propellers are interesting for practical reasons, as they can be mass-fabricated using standard photolithography techniques. 
Following the earlier development of a theory of driven rotation and propulsion of magnetized object of an arbitrary shape in an in-plane rotating magnetic field ‎[2], we propose general symmetry arguments (involving parity and charge conjugation) establishing correspondence between propulsive solutions of simple planar V-shaped structures on orientation of the dipolar magnetic moment ‎[3]. In particular, it can be shown that in-plane magnetization results in propulsion due to a spontaneous symmetry breaking, whereas the rotating motors swim either parallel or anti-parallel to the field rotation axis depending on their initial orientation.  Particular off-plane magnetization yields unidirectional propulsion typically associated with chiral structures, such as helices.
Since planar micro/nano-structures are prone to in-plane magnetization and their uniform off-plane magnetization is not an easy task, the interesting question is whether they can be steered in a controllable fashion? Here we demonstrate that actuation by a conically rotating magnetic field (i.e., superposition of an in-plane rotating field and constant field orthogonal to it) can yield efficient unidirectional propulsion of planar and in-plane magnetized structures ‎[4]. In particular, we found that the symmetrical V-shape magnetized along its symmetry axis which exhibits no net propulsion in in-plane rotating field, shows unidirectional in-sync propulsion with a constant (frequency-independent) velocity when actuated by the conical field. When the constant field is imposed in plane of the rotating field, it results in the net propulsion accompanied by the drift orthogonal to the axis of the field rotation. Such setup can potentially be used to achieve spatial control over motion of multiple propellers.


 

Zheng Liu

Associate Professor 

Centre for Micro-/Nano-electronics (NOVITAS)

School of Electrical and Electronic Engineering
Nanyang Technological University

Singapore

Personal homepage

 

Title:

Abstract:


 

Kenji Matsuda

Professor 

Department of Synthetic Chemistry and Biological Chemistry

Graduate School of Engineering
Kyoto University

Japan

Personal homepage

 

Title: Photochromic Molecules for Photoswitching Units in Molecular
Optoelectronics

Abstract: In molecular electronics, photochromic compounds are considered to be promising candidates for photoswitching units. In diarylethenes (DAEs) the connectivity of -system changes significantly by irradiation of light. Based on this idea, the photoswitching of exchange interaction and molecular conductance through DAE molecule has been achieved by our group. Drain-current switching of DAE-channel organic field-effect transistors with light- and electric-field effects will also be presented. With respect to the arrangement of DAE molecules, high sensitive photochemical control of the assembly using high cooperative system at two-dimensional solid/liquid interface will be presented.


 

Zhihong Nie

Professor 

State Key Laboratory of Molecular Engineering of Polymers

Department of Macromolecular Science
Fudan University

China

Personal homepage

 

Title: Nano-molecules: New Building Blocks for Materials Discovery

Abstract: The past decades have witnessed remarkable success in the synthesis of inorganic nanoparticles with interesting optical, electronic, or magnetic properties. Realizing the enormous potential of nanoparticles in such as energy, biomedical, and optoelectronic fields requires the organization of these particles into larger or hierarchically ordered structures with defined macroscopic properties. Molecules are the most important building blocks of matter. They exhibit astonishing precision in the arrangement of atoms and are capable of assembling into functional structures with high complexity and diverse functions. The ability to organize nanoparticles into molecule equivalents holds great promises to manipulate matter at nanoscale scale and to exploit the emergent properties of nanoparticle ensembles. In this talk, I will present our efforts to the design of “nanoscale molecules” (nano-molecules) via self-assembly and the discovery of new materials from nano-molecules.


 

Hiroshi Onishi

Professor

Chemistry Department

Kobe University

Program Officer

Japan Society for the Promotion of Science


Japan

Personal homepage

 

Title: Pico-Newton Force Sensing at Liquid-Solid Interfaces: Application to Lubricants

Abstract: Frequency-modulation atomic force microscopy (FM-AFM) is a promising tool to observe solid topography and also liquid structure at liquid-solid interfaces. The cantilever with a tip is mechanically oscillated. The shift of the resonance frequency, delta f, represents the force pushing or pulling the tip. Microscopes with a force sensitivity of 10 pN or better in water and organic solvents have been developed and commercialized to date. Using the advanced microscopes, we have examined structured liquids at a number of interfaces including water-CaCO3, SrTiO3, organic monolayers, etc. The observed delta-f distributions are interpreted with water density distribution through Gibbs free energy perturbed by the solid surface. The force sensitivity of 10 pN is the key for probing force on single liquid molecules.
Possible application of delta-f mapping to tribology research will also be mentioned. Most liquid lubricants used in mechanical applications are low-vapor-pressure hydrocarbons modified with a small quantity of polar compounds. The polar modifiers are deposited on the surface of sliding solids, typically steel objects. The deposited layer reduces friction and wear by preventing direct contacts of solids. Controlling the adsorbed layer is the key to improve lubrication at liquid-solid interfaces. The lateral and vertical distribution of the adsorbed layers should be characterized in lubricants. This is not an easy task. FM-AFM provides the local density distribution of lubricants in a spatial resolution of 0.1 nm or better.


 

Philippe Poulin

Professor

Centre de Recherche Paul Pascal - CNRS

University of Bordeaux

France

Personal homepage

 

Title:

Abstract:


 

Xin Su

Senior Associate Editor

Wiley-VCH

Weinheim, Germany
Senior Associate Editor

Angewandte Chemie, Germany

Personal homepage

 

Title:

Abstract:


 

Gajendra S Shekhawat

Research Professor

Department of Material Science and Engineering

Director, Scanned Probe Imaging and Development Center
Northwestern University

USA

Personal homepage

 

Title: Micromachined based Chip Scale Thermal Sensor for Hot Spot Mapping in Transition Metal Dichalcogenides

Abstract: The lateral resolution of scanning thermal microscopy (SThM) has hitherto never approached that of mainstream atomic force microscopy, mainly due to poor performance of the thermal sensor. Herein, we will present a nanomechanical system based thermal sensor (thermocouple) that enables high lateral spatial resolution that is often required in nanoscale thermal characterization in wide range of applications. This thermocouple-based probe technology delivers excellent lateral resolution (~ 20 nm), extended high temperature measurements greater than 700°C without cantilever bending, and a very high thermal sensitivity (̃~0.04 °C). The origin of significantly improved figures-of-merit lies in the probe design that consists of a hollow silicon tip integrated with a vertically oriented thermocouple sensor at the apex (low thermal mass) which interacts with the sample through a metallic nanowire (50 nm diameter), thereby achieve high lateral resolution. The efficacy of this approach to SThM is demonstrated by imaging embedded metallic nanostructures in silica core shell, spatially map the temperature rise across various defects and heterogeneities of titanium carbide (Ti3C2Tx - T stands for surface terminations) MXene nanostructures under high electrical bias with sub-50-mK temperature resolution,  and to map the spatial distribution of the temperature rise within monolayer transition metal dichalcogenide (TMD) devices upon dissipating a high electrical power through a lateral interface. The results directly demonstrate that lateral heterojunctions between MoS2 sub-50-nm spatial resolutions. The nanoscale pitch and extremely small thermal mass of the probe promise significant improvements over existing methods and wide range of applications including in semiconductor devices, biomedical imaging, and data storage.


 

Weihong Tan

Distinguished Professor, V. T. and Louise Jackson Professor of Chemistry

University of Florida

USA

Vice President and Director
State Key Laboratory of Chemo/Biosensing and Chemometrics

Hunan University, China

Academician, Chinese Academy of Sciences

Personal homepage

 

Title:

Abstract:


 

Ben Zhong Tang

Stephen K. C. Cheong Professor of Science

Chair Professor of Chemistry

Chair Professor of Chemical and Biological Engineering

Academician, Chinese Academy of Sciences

Fellow, Royal Society of Chemistry


The Hong Kong University of Science and Technology

Personal homepage

 

Title:

Abstract:


 

Yoshito Tobe

Professor Emeritus and Guest Professor

The Institute of Scientific and Industrial Research

Osaka University, Japan

Chair Professor

National Chiao Tung University, China

Personal homepage

 

Title: Nanopatterning by Covalent Grafting of Graphite using Self-Assembled Molecular Networks as Templates

Abstract: Since periodically controlled chemical functionalization of carbon materials broadens application potential and supports processing and development, methods that yield nanopatterned functionalization on flat carbon surfaces are critical for modulation of the intrinsic electronic and physical properties of these materials. We reported a new molecular scale lithographic approach which employs lamellar type self-assembled molecular monolayers of n-alkanes as templating masks during electrochemical covalent functionalization of graphite and graphene surfaces. One-dimensional control with a lateral periodicity between 4 and 7 nm was demonstrated utilizing molecular templates of different alkane lengths. The key to the success for this method is a phase separated solution double layer consisting of the masking organic layer underneath an aqueous layer containing electrochemically active diazonium molecules which upon electrochemical reduction generate aryl radicals capable of surface grafting. This protocol was applied to two-dimensional control of grafting by using porous self-assembled molecular networks formed by hexaalkoxy-substituted triangle building blocks as templating masks.


 


Jussi Toppari

Professor 

Department of Physics

Nanoscience Center
University of Jyväskylä

Finland

Personal homepage

 

Title: Plasmonic Nanostructures and Single Electron Devices Based on DNA Constructions

Abstract: The molecular electronics as well as molecular scale optics (via plasmonics), have long been visualized to pose the next huge leap in technology development. Even not fully realized yet, the promises of these nanotechnologies are certainly getting closer to be fulfilled. The most crucial issues in realization of functional molecular scale electrical devices is to find both molecular conductors as well as suitable building blocks and scaffolds, for nanoscale assembly. For nano-optics the plasmonic nanostructures have shown high potent due to their unique optical properties such as field enhancement and possibilities for subwavelength optics. However, due to limitations of the conventional nanofabrication methods, nanostructures with tunable plasmonic/optical activity in visible range are hard to realize, especially in large amounts. At the moment, DNA has proven to be a very versatile and promising molecule for nanoscale patterning. Quickly developing techniques based on DNA self-assembly provide precise and programmable ways to form electrical molecule scale devices as well as plasmonic nanoscale structures, even in large quantities. Yet, in the respect of the long history and debate on the possibly conductivity of DNA itself, the electrical properties of DNA-based structures are also of a great interest.

We have studied the conductance of several types of individual DNA nanostructures and found that even the electrical conductivity of DNA-helix as such, seems to be too fragile to be directly utilized, the multilayered 3D DNA origami structures may have improved properties. However, more robust realization of DNA-based electrical devices, relies on other components and uses DNA as only a scaffold. Hence, we have utilized DNA nanostructures to assemble a row of gold nanoparticles (AuNP). The whole entity is further trapped between metallic electrodes where AuNPs act as metallic islands to form a single electron transistor (SET). Due to small size of the islands, this SET could work even at room temperature in contrast to the usually needed kryogenic temperatures. For nanoscale optics, we have developed a novel method, which takes advantage of the DNA origami constructions and together with conventional nanofabrication processes enabling fabrication of high quality sub-100-nanometer plasmonic nanostructures with desired shapes. As a demonstration, we have fabricated optical bowtie antennas with a tunable plasmonic resonance in visible range. The method is highly parallel, which enabled us to fabricate also optically chiral surface with high coverage. This ability to fabricate metallic nanoparticles with designed shape in high quantities provides great potential in various applications, especially sensing and metamaterial fabrication.


 

Takayuki Uchihashi

Professor 

Laboratoy of Biomolecular Dynamics and Function

Department of Physics
Nagoya Unversity

Japan

Personal homepage

 

Title: Real-time nanoscale visualization of biological molecules at work with high-speed atomic force microscopy

Abstract: Biological molecules fulfil a wide variety of unique functions. Their functions are essentially elicited from conformational change and/or interactions with other molecules which are often triggered by binding of ligand/substrate and changes in the external environment. Therefore, studying dynamic processes on individual molecules is indispensable to gain mechanistic insight into biological molecules. Nevertheless, a tool with an ability to directly record both conformational changes and dynamic molecular interactions in real time at single-molecule resolution has not been available. Atomic force microscopy (AFM) is a versatile technique to study nanoscale structures of materials under various environments. One of the most coveted new functions of AFM is “fast recording” because it allows the observation of dynamic processes occurring at the nanoscale. The visualization of dynamic processes provides direct and deep insights into the target objects and phenomena under the microscope. This new capability of observation should open a new opportunity to reveal essential mechanisms of working proteins. In this talk, we demonstrate some applications of high-speed AFM to imaging of dynamics of single molecules, living cells and dynamic process at solid/liquid interface.


 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*The list of Keynote speakers is based on the alphabetical order of family names

 

 

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Title:

Abstract:


 

Qiang He

Professor

Micro/Nanotechnology Research Center

Harbin Institute of Technology
China

 

Personal homepage

 

Title: Self-propelled swimming nanomachines for biomedical applications

Abstract: Current drug nanocarriers have potential to perform targeted drug delivery since they can achieve longer systemic circulation so that more drugs can be deposited at the tumor site through the enhanced permeability and retention (EPR) effect. Although various nanocarriers have been successfully used to deliver drugs, the targeting ratios are still very low since they cannot actively seek the tumor site and also lack a propelling force to penetrate the tumor beyond their normal diffusion limit. Inspired by natural swimmers (e.g. bateria), our group focuses on the design of synthetic swimming nanomachines which have ability of converting chemical energy or various physical stimuli into autonomous motion in fluids. These as-assembled nanomachines are able to be served as both autonomous motor and smart cargo, performing drug loading, targeted transportation and remote controlled release in the vicinity of cells and tissues in an organism. Such swimming nanomachines may provide a new trend in the design of next-generation drug delivery for actively seeking sites of diseases and targeted drug transport.


 

Zheng Liu

Associate Professor 

Centre for Micro-/Nano-electronics (NOVITAS)

School of Electrical and Electronic Engineering
Nanyang Technological University

Singapore

Personal homepage

 

Title:

Abstract:


 

Kenji Matsuda

Professor 

Department of Synthetic Chemistry and Biological Chemistry

Graduate School of Engineering
Kyoto University

Japan

Personal homepage

 

Title: Photochromic Molecules for Photoswitching Units in Molecular
Optoelectronics

Abstract: In molecular electronics, photochromic compounds are considered to be promising candidates for photoswitching units. In diarylethenes (DAEs) the connectivity of -system changes significantly by irradiation of light. Based on this idea, the photoswitching of exchange interaction and molecular conductance through DAE molecule has been achieved by our group. Drain-current switching of DAE-channel organic field-effect transistors with light- and electric-field effects will also be presented. With respect to the arrangement of DAE molecules, high sensitive photochemical control of the assembly using high cooperative system at two-dimensional solid/liquid interface will be presented.


 

Zhihong Nie

Professor 

State Key Laboratory of Molecular Engineering of Polymers

Department of Macromolecular Science
Fudan University

China

Personal homepage

 

Title: Nano-molecules: New Building Blocks for Materials Discovery

Abstract: The past decades have witnessed remarkable success in the synthesis of inorganic nanoparticles with interesting optical, electronic, or magnetic properties. Realizing the enormous potential of nanoparticles in such as energy, biomedical, and optoelectronic fields requires the organization of these particles into larger or hierarchically ordered structures with defined macroscopic properties. Molecules are the most important building blocks of matter. They exhibit astonishing precision in the arrangement of atoms and are capable of assembling into functional structures with high complexity and diverse functions. The ability to organize nanoparticles into molecule equivalents holds great promises to manipulate matter at nanoscale scale and to exploit the emergent properties of nanoparticle ensembles. In this talk, I will present our efforts to the design of “nanoscale molecules” (nano-molecules) via self-assembly and the discovery of new materials from nano-molecules.


 

Hiroshi Onishi

Professor

Chemistry Department

Kobe University

Program Officer

Japan Society for the Promotion of Science


Japan

Personal homepage

 

Title: Pico-Newton Force Sensing at Liquid-Solid Interfaces: Application to Lubricants

Abstract:


 

Philippe Poulin

Professor

Centre de Recherche Paul Pascal - CNRS

University of Bordeaux

France

Personal homepage

 

Title:

Abstract:


 

Xin Su

Senior Associate Editor

Wiley-VCH

Weinheim, Germany
Senior Associate Editor

Angewandte Chemie, Germany

Personal homepage

 

Title:

Abstract:


 

Gajendra S Shekhawat

Research Professor

Department of Material Science and Engineering

Director, Scanned Probe Imaging and Development Center
Northwestern University

USA

Personal homepage

 

Title: Micromachined based Chip Scale Thermal Sensor for Hot Spot Mapping in Transition Metal Dichalcogenides

Abstract: The lateral resolution of scanning thermal microscopy (SThM) has hitherto never approached that of mainstream atomic force microscopy, mainly due to poor performance of the thermal sensor. Herein, we will present a nanomechanical system based thermal sensor (thermocouple) that enables high lateral spatial resolution that is often required in nanoscale thermal characterization in wide range of applications. This thermocouple-based probe technology delivers excellent lateral resolution (~ 20 nm), extended high temperature measurements greater than 700°C without cantilever bending, and a very high thermal sensitivity (̃~0.04 °C). The origin of significantly improved figures-of-merit lies in the probe design that consists of a hollow silicon tip integrated with a vertically oriented thermocouple sensor at the apex (low thermal mass) which interacts with the sample through a metallic nanowire (50 nm diameter), thereby achieve high lateral resolution. The efficacy of this approach to SThM is demonstrated by imaging embedded metallic nanostructures in silica core shell, spatially map the temperature rise across various defects and heterogeneities of titanium carbide (Ti3C2Tx - T stands for surface terminations) MXene nanostructures under high electrical bias with sub-50-mK temperature resolution,  and to map the spatial distribution of the temperature rise within monolayer transition metal dichalcogenide (TMD) devices upon dissipating a high electrical power through a lateral interface. The results directly demonstrate that lateral heterojunctions between MoS2 sub-50-nm spatial resolutions. The nanoscale pitch and extremely small thermal mass of the probe promise significant improvements over existing methods and wide range of applications including in semiconductor devices, biomedical imaging, and data storage.


 

Weihong Tan

Distinguished Professor, V. T. and Louise Jackson Professor of Chemistry

University of Florida

USA

Vice President and Director
State Key Laboratory of Chemo/Biosensing and Chemometrics

Hunan University, China

Academician, Chinese Academy of Sciences

Personal homepage

 

Title:

Abstract:


 

Ben Zhong Tang

Stephen K. C. Cheong Professor of Science

Chair Professor of Chemistry

Chair Professor of Chemical and Biological Engineering

Academician, Chinese Academy of Sciences

Fellow, Royal Society of Chemistry


The Hong Kong University of Science and Technology

Personal homepage

 

Title: Advanced Functional AIE Dots

Abstract: Long-term non-invasive cell tracing by fluorescent probes is of great importance to understand genesis, development, invasion and metastasis of cancerous cells. To efficiently trace living cells through a noninvasive and real-time manner, researchers have devoted much effort to develop new fluorescent probes. Traditional π-conjugated fluorophors are prone to aggregate, which often quenches their light emissions and is a common photophysical phenomenon known as aggregation-caused quenching (ACQ). We succeeded in developing a series of efficient organic emitters with aggregation-induced emission (AIE) characteristics by linking propeller-like tetraphenylethene (TPE) unit to traditional dyes through covalent bond. Encapsulation of the AIE luminogens in biocompatible polymer matrix yields optically stable nanodots with uniform size, high brightness and low cytotoxicity. The AIE nanodots carrying specific surface functional groups show high emission efficiency, large absorptivity, excellent biocompatibility and strong photo-bleaching resistance, making them ideal for targeting specific cells and/or tissues, and long-term non-invasive in vitro and in vivo cell tracing. Moreover, different from quantum dot (QD)-based probes, the organic fluorescent nanodots show no blink state and do not contain heavy metal ions that are potentially toxic when used in biological systems. The organic AIE dots outperform their counterparts of commercial inorganic QDs-based cell tracing probes, opening a new avenue in the development of applications, such as organic fluorescent probes for monitoring biological processes.


 

Yoshito Tobe

Professor

Division of Frontier Materials Science

Department of Materials Engineering Science
Graduate School of Engineering Science

Osaka University

Personal homepage

 

Title:

Abstract:


 


Jussi Toppari

Professor 

Department of Physics

Nanoscience Center
University of Jyväskylä

Finland

Personal homepage

 

Title: Plasmonic Nanostructures and Single Electron Devices Based on DNA Constructions

Abstract: The molecular electronics as well as molecular scale optics (via plasmonics), have long been visualized to pose the next huge leap in technology development. Even not fully realized yet, the promises of these nanotechnologies are certainly getting closer to be fulfilled. The most crucial issues in realization of functional molecular scale electrical devices is to find both molecular conductors as well as suitable building blocks and scaffolds, for nanoscale assembly. For nano-optics the plasmonic nanostructures have shown high potent due to their unique optical properties such as field enhancement and possibilities for subwavelength optics. However, due to limitations of the conventional nanofabrication methods, nanostructures with tunable plasmonic/optical activity in visible range are hard to realize, especially in large amounts. At the moment, DNA has proven to be a very versatile and promising molecule for nanoscale patterning. Quickly developing techniques based on DNA self-assembly provide precise and programmable ways to form electrical molecule scale devices as well as plasmonic nanoscale structures, even in large quantities. Yet, in the respect of the long history and debate on the possibly conductivity of DNA itself, the electrical properties of DNA-based structures are also of a great interest.

We have studied the conductance of several types of individual DNA nanostructures and found that even the electrical conductivity of DNA-helix as such, seems to be too fragile to be directly utilized, the multilayered 3D DNA origami structures may have improved properties. However, more robust realization of DNA-based electrical devices, relies on other components and uses DNA as only a scaffold. Hence, we have utilized DNA nanostructures to assemble a row of gold nanoparticles (AuNP). The whole entity is further trapped between metallic electrodes where AuNPs act as metallic islands to form a single electron transistor (SET). Due to small size of the islands, this SET could work even at room temperature in contrast to the usually needed kryogenic temperatures. For nanoscale optics, we have developed a novel method, which takes advantage of the DNA origami constructions and together with conventional nanofabrication processes enabling fabrication of high quality sub-100-nanometer plasmonic nanostructures with desired shapes. As a demonstration, we have fabricated optical bowtie antennas with a tunable plasmonic resonance in visible range. The method is highly parallel, which enabled us to fabricate also optically chiral surface with high coverage. This ability to fabricate metallic nanoparticles with designed shape in high quantities provides great potential in various applications, especially sensing and metamaterial fabrication.


 

Takayuki Uchihashi

Professor 

Laboratoy of Biomolecular Dynamics and Function

Department of Physics
Nagoya Unversity

Japan

Personal homepage

 

Title: Real-time nanoscale visualization of biological molecules at work with high-speed atomic force microscopy

Abstract: Biological molecules fulfil a wide variety of unique functions. Their functions are essentially elicited from conformational change and/or interactions with other molecules which are often triggered by binding of ligand/substrate and changes in the external environment. Therefore, studying dynamic processes on individual molecules is indispensable to gain mechanistic insight into biological molecules. Nevertheless, a tool with an ability to directly record both conformational changes and dynamic molecular interactions in real time at single-molecule resolution has not been available. Atomic force microscopy (AFM) is a versatile technique to study nanoscale structures of materials under various environments. One of the most coveted new functions of AFM is “fast recording” because it allows the observation of dynamic processes occurring at the nanoscale. The visualization of dynamic processes provides direct and deep insights into the target objects and phenomena under the microscope. This new capability of observation should open a new opportunity to reveal essential mechanisms of working proteins. In this talk, we demonstrate some applications of high-speed AFM to imaging of dynamics of single molecules, living cells and dynamic process at solid/liquid interface.


 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*The list of Keynote speakers is based on the alphabetical order of family names