Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 2nd World Congress and Expo on Graphene & 2D Materials Frankfurt, Germany.

Day 2 :

Keynote Forum

John Cerne

University at Buffalo, USA

Keynote: Quantum Hall effect near the cyclotron resonance of a two-dimensional electron gas

Time : 09:30-10:10

OMICS International Graphene World 2017 International Conference Keynote Speaker John Cerne photo
Biography:

John Cerne completed his Batchelor’s degree in Physics at Princeton University and his PhD in Condensed Matter Experimental Physics at the University of California, Santa Barbara. He is a Physics Professor at the University at Buffalo, where is also the Director of Undergraduate Studies for the Physics Department. He has published 60 papers in refereed journals.

Abstract:

Although the fundamental nature of quantum Hall effect (QHE) involves a constant flow of carriers in topologicallyprotected edge states where backscattering is supressed, the QHE has been found to persist at terahertz (THz, ~4 meV) frequencies in various 2D systems such as graphene and semiconductor 2D electron gases. We measure the Hall conductivity of a two-dimensional electron gas formed at a GaAs/AlGaAs heterojunction in the THz regime close to the cyclotron resonance (CR) frequency using highly sensitive Faraday rotation measurements. The sample is electrically gated, allowing the electron density to be changed continuously by more than a factor of 3. We observe clear plateau like and steplike features in the Faraday
rotation angle vs. electron density and magnetic field (Landau-level filling factor) even at fields or frequencies within half a linewidth of the CR absorption. It is surpising to see QHE plateaus where the conductivity is dominated by inter-Landau level optical absorption. We have also looked for signatures of the QHE near CR in graphene at mid-infrared energies (~100 meV).

Keynote Forum

Eun-Jae Chung

Seoul National University College of Medicine, South Korea

Keynote: Bioartificial esophagus: Strategy for layered structure regeneration

Time : 10:10 - 10:50

OMICS International Graphene World 2017 International Conference Keynote Speaker Eun-Jae Chung photo
Biography:

Eun-Jae Chung has completed his PhD from the Korea University, Seoul, Korea. He is the Associate Professor of Seoul National University, Seoul, Korea. He has published more than 30 papers in reputed journals.

Abstract:

A number of congenital and acquired disorders require esophageal tissue replacement. Various surgical techniques, such as gastric and colonic interposition, are standards of treatment, but frequently complicated by stenosis and other problems. Autologous graft therapies using tissues from colon, and small and large intestine or gastric transplantations have been attempted but have constraints like leakage, infection and stenosis at the implanted site, which leads to severe morbidity and mortality. An alternative for autologous grafts are allogenic and xenogenic grafts, which have better availability but disease transmission and immunogenicity limit their applications. Regenerative medicine approaches facilitate the use of biological constructs to replace or regenerate normal tissue function. Use of biodegradable and biocompatible scaffolds to engineer the esophagus promises to be an effective regenerative strategy for treatment of esophageal disorders. Nanotopography of the fibrous scaffolds mimics the natural extracellular matrix (ECM) of the tissue and incorporation of chemical cues and tailoring mechanical properties
provide the right microenvironment for co-culture of different cell types. Scaffolds cultured with esophageal cells (epithelial cells, fibroblast and smooth muscle cells) might show enhancement of the biofunctionality in vivo. This review attempts to address the various strategies and challenges involved in successful tissue engineering of the esophagus. Novel approaches need to be designed to allow for peristalsis and vascularization in the engineered esophagus.

Keynote Forum

Konstantinos Papagelis

Foundation for Research and Technology-Hellas (FORTH), Greece

Keynote: Mechanical strain in two-dimensional materials

Time : 11:05-11:45

OMICS International Graphene World 2017 International Conference Keynote Speaker Konstantinos Papagelis photo
Biography:

Konstantinos Papagelis is a Professor at the Physics Department of the University of Patras and collaborating Faculty Member at FORTH/ICEHT. He conducted research
for more than four years at the University of Sussex (UK), Regensburg (Germany), Bristol (UK) and Technische Universität Berlin (Germany). His current research activities
focused on the optical and mechanical properties of graphene and other 2D materials and the production of high volume fraction nanocarbon/polymer nanocomposites.
He has published more than 130 scientific articles and received the award of the John S Latsis Public Benefit Foundation in 2011. He is Member of the Editorial Board of
Scientific Reports (NPG).

Abstract:

The application of mechanical strain in single- and few-layer graphenes as well as in other two dimensional (2D) materials
(MoS2, WS2) is an important perturbation to tune their optical and electronic properties. Raman spectroscopy has
been proven a very successful technique to study the influence of mechanical strain in 2D materials under uniaxial tension,
compression or hydrostatic (biaxial) strain. The monitoring of optical phonons seems to be the clearest and simplest way to
quantify the macroscopic stress/strain imparted to 2D membranes. In this speech, recent results on the uniaxial and biaxial
Raman response of selected 2D materials will be presented and discussed. The results will be coupled by theoretical analysis
based on molecular dynamics simulations using accurate atomistic potentials. Emphasis should be given on the perspectives
in the design of graphene based nanocomposites and flexible electronics.