Bulletin of the American Physical Society
Spring 2017 Meeting of the APS New England Section, held jointly with NanoWorcester
Volume 62, Number 5
Friday–Saturday, April 14–15, 2017; Worcester, Massachusetts
Session D5: Experiment and Instrumentation |
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Chair: Bryan Huey, University of Connecticut Room: Olin Hall 218 |
Saturday, April 15, 2017 10:15AM - 10:20AM |
D5.00001: Opening Remarks |
Saturday, April 15, 2017 10:20AM - 10:40AM |
D5.00002: Calorimetric Study of Se90In8Ag2 Glassy Alloy D Sharma, R K Shukla, A Kumar, J C MacDonald The Se90In8Ag2 glassy alloy was heated from 0 oC to 250 oC and cooled from 250 oC to 0 oC using calorimetric technique. Three types of transitions were found where two were endothermic and one was exothermic transitions. They are named as glass transition, crystallization and melting transition. To study effect of ramp rate, the same material was then heated and cooled at various ramp rated from 5 oC/min to 20 oC/min and the transitions found shifted showing the presence of kinetics of the transitions. These transitions follow Moynihan {\&} Ozawa (MO) model and Johnson-Mehl-Avrami (JMA) theory. Following these models, the activation energy of each transition was calculated and found to be in the range of 202 kJ/mol, 402 kJ/mol and 558 kJ/mol for glass transition, crystallization and melting transitions respectively. Keywords: Glassy alloy, activation, kinetics, calorimetry, heating and cooling, glass transition, crystallization. [Preview Abstract] |
Saturday, April 15, 2017 10:40AM - 11:00AM |
D5.00003: Ultrasonic characterization of human colon carcinoma cells in the 5-25 MHz frequency range Amy Longstreth, Judene Thomas, Yaa Kwakwa, Janae Davis, Maria-Teresa Herd Early recognition of cancerous tissue is crucial in receiving a favorable prognosis. Diagnostic tools that allow for an understanding of differences in the ultrasonic characteristics (such as speed of sound (SOS), attenuation, and backscatter coefficients (BSC)) in malignant and benign cells can aid in early diagnostics. Although statistically significant distinctions between benign and cancerous tumor scatterer properties have been demonstrated, there is little knowledge about which cell characteristics create differences in scattering. This study centers on the development of innovated techniques using quantitative ultrasound to quantify the microstructure of HTC (colon cancer) cells in an attempt to establish a greater understanding of scattering mechanisms. To analyze these characteristics HTC cells were cultured, suspended in agar and prepared into samples. Broadband BSC measurements were conducted using focused transducers and narrowband attenuation and SOS measurements were performed using receiving and transmitting transducers. All experiments were made in the 5-25MHz range at 33\textdegree C. The results introduce relevant data useful for comparative studies and further analysis. [Preview Abstract] |
Saturday, April 15, 2017 11:00AM - 11:20AM |
D5.00004: Novel high-speed AFM modes to study mechanical properties of cells and soft materials at the nanoscale Maxim Dokukin, Igor Sokolov Here we present two novel and quantitative atomic force microscopy (AFM) modes of operation, which allow studying mechanical properties of biological and soft materials at the nanoscale. The first one, FT-NanoDMA AFM mode is a combination of three different methods: the quantitative dynamic mechanical spectroscopy (DMS), AFM indentation, and Fourier-transform spectroscopy. This new spectroscopy mode is fast and sensitive enough to allow DMS imaging of nanointerfaces and single cells, while attaining about 100x improvements in both spatial (down to 10nm) and temporal resolution (down to 0.7 sec/pixel) compared to the current state-of-the-art. The second mode is an extension of popular sub-resonant oscillatory AFM imaging. It utilizes the signal information from the free resonance oscillations of the cantilever which occur after detaching the probe from a sample surface (ringing). It delivers multiple new imaging channels. [Preview Abstract] |
Saturday, April 15, 2017 11:20AM - 11:40AM |
D5.00005: Recent advances in AFM based nanoscale infrared spectroscopy. Jay Anderson, Eoghan Dillon, Kevin Kjoller, Anirban Roy This talk will focus on the recent advances in measuring the chemical and optical properties of materials with nanometer scale spatial resolution. Conventional infrared spectroscopy is one of the most widely used tools for chemical analysis, but optical diffraction limits its spatial resolution to the scale of many microns. Atomic force microscopy (AFM) enjoys excellent spatial resolution, but has historically lacked the ability to perform robust chemical analysis. This presentation will discuss the advances in two techniques (1) AFM-based infrared spectroscopy (AFM-IR) and (2) scattering scanning near field optical microscopy (s-SNOM). Both of these techniques overcome the diffraction limit, providing the ability to measure and map chemical and optical properties with 10 nanometer spatial resolution. Recent advances including Tapping AFM-IR and increases in laser sweep rates have significantly improved the resolution and sensitivity of AFM-IR, allowing for the capability to collect hyperspectral images. As complementary techniques, AFM-IR and s-SNOM together provide an unrivaled capability to perform nanoscale chemical analysis on a diverse range of organic, inorganic, photonic and electronic materials. This talk will focus on AFM and s-SNOM applications on samples from fields including polymers, life sciences, graphene and nanoantennas. [Preview Abstract] |
Saturday, April 15, 2017 11:40AM - 12:00PM |
D5.00006: Nanoscale Chemical Analysis with Photo-induced Force Microscopy Sung Park Photo-induced Force Microscopy (PiFM) is based on AFM coupled to a mid-IR laser. PiFM measures the dipole induced at or near the sample surface by an excitation source by detecting the dipole-dipole force between the induced sample dipole and the mirror image dipole in the metallic tip. This interaction is strongly affected by the optical absorption spectrum of the sample, providing significant spectral contrast which is used to differentiate chemical species. PiFM acquires topography and spectral images concurrently and naturally provides information on the relationship between chemistry and topology. Due to the steep dipole-dipole force dependence on the tip-sample gap distance, spectral images have spatial resolution approaching the topographic resolution of AFM; demonstrating sub 10nm resolution. PiFM spectral images surpass those generated via scanning transmission X-ray microscopy, micro CF Raman microscopy, and EMs, both in spatial resolution and chemical specificity. Broad capabilities of PiFM will be highlighted on organic, inorganic, and low dimensional materials. By enabling nm-scale imaging with chemical specificity, PiFM provides a powerful method to deepen our understanding of nanomaterials and facilitate applications of such materials. [Preview Abstract] |
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