{"id":140,"date":"2016-11-08T10:59:43","date_gmt":"2016-11-08T15:59:43","guid":{"rendered":"https:\/\/sciencescosmaincms.cm.ucf.edu\/chemistry\/szou\/?page_id=140"},"modified":"2022-05-02T12:52:04","modified_gmt":"2022-05-02T16:52:04","slug":"cnc","status":"publish","type":"page","link":"https:\/\/sciences.ucf.edu\/chemistry\/szou\/cnc\/","title":{"rendered":"Computational Nanomaterial Chemistry"},"content":{"rendered":"

 <\/p>\n

\"\"<\/p>\n

Dr Shengli Zou’s <\/a>research group at University of Central Florida is currently working on research in the field of nanoparticles and their properties pertaining to light transmittance and absorption.\u00a0 This web page is designed to aid in understanding how materials respond to light energy changes and how that affects materials on a molecular scale.<\/p>\n

\n

<\/a>Plasmonics<\/h2>\n

Def. The study of density waves of electrons (plasmons) that are created when light hits the surface of a metal at precise circumstances, that is, at the structure\u2019s resonance energy level. The resonance energy corresponds to the wavelength absorption that occurs. If a band of wavelengths strike the metallic object the non-absorbed wavelengths will reflect, causing the structure to have color. <\/span>”<\/p>\n

\"Fig
Fig a. resonance on a thin sheet of metal Fig b. resonance on a single particle note that the light blue electron cloud is oscillating toward and away from the electric field.<\/figcaption><\/figure>\n

 <\/p>\n

These surface plasmons\u00a0 occur at the interface of a metal and a dielectric material.\u00a0\u00a0 The optic properties of these\u00a0 surface plasmons can be determined in two ways.<\/p>\n

1. \u00a0By using spectroscopy equipment in a laboratory setting.<\/p>\n

Or<\/p>\n

2. By using computer modeling with\u00a0 a program called Discrete Dipole Approximation (DDA)<\/p>\n

 <\/p>\n

\n

Surface Plasmons<\/h2>\n

\u00a0Surface plasmons (SP’s) are electromagnetic waves that propagate ( travel )at the interface between metals and dielectric (non conductive) material. This simulates the propagation of surface plasmons on Ag-air interface, the color indicates the magnitude or strength of electric field (blue for positive and red for negative).\u00a0 The source for SP\u2019s is a point dipole and is placed at the center. In this simulation, you can also see strong localization of these waves at the interface. The plasmon behavior has attracted the attention of researchers in engineering, physics and chemistry communities.\u00a0<\/span><\/p>\n

\"\"<\/p>\n

Resonance frequency–def.\u00a0 <\/i><\/b>Maximum oscillation at specific frequencies. Each size and shape nanoparticle represents a different resonance frequency.\u00a0 For more information about resonance these web sites may help.\u00a0 In the first animation when the force applied matches the maximum spring constant resonance occurs.\u00a0 Similarly, when the wavelength frequency matches the resonance energy maximum oscillation of the plasmons occur.<\/i><\/p>\n

http:\/\/ngsir.netfirms.com\/englishhtm\/Resonance.htm<\/b><\/a><\/p>\n

http:\/\/www.pbs.org\/wgbh\/nova\/elegant\/resonance.html<\/b><\/a><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

  Dr Shengli Zou’s research group at University of Central Florida is currently working on research in the field of nanoparticles and their properties pertaining to light transmittance and absorption.\u00a0 This web page is designed to aid in understanding how materials respond to light energy changes and how that affects materials on a molecular scale. … Continue reading “Computational Nanomaterial Chemistry”<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-140","page","type-page","status-publish","hentry"],"yoast_head":"\nComputational Nanomaterial Chemistry - Shengli Zou<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sciences.ucf.edu\/chemistry\/szou\/cnc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Computational Nanomaterial Chemistry - 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