2014英特爾ISEF獲獎作品摘要 化學 Intel Finalist Abstract Chemistry

獲獎作品基本信息

年份	2014
學科	化學 Chemistry
國家/州	United States of America

獲獎作品名稱

Stoichiometric Laser-Induced Breakdown Spectroscopy for Simple and Cost-Effective Laser Material Fabrication: A Case Study of Polycrystalline Yttrium Aluminum Garnet Ceramics

獲獎作品摘要

The fabrication of laser grade ceramics must be improved to achieve better reproducibility of high quality yields, requiring a control of the bulk stoichiometry beyond that of current analytical techniques. This work evaluated Laser-Induced Breakdown Spectroscopy (LIBS) for measuring the aluminum to yttrium ratio in Y3Al5O12 (YAG) laser ceramics. The student developed a novel plasma code using Matlab software to model LIBS plasmas, and utilizing this model, elucidated the effects of variation in plasma temperature (T), electron density (Ne), and sample composition on the chemical composition of the plasma. A theoretical optimization of experimental parameters was then achieved for the first time via a Monte Carlo approach (T=1eV, Ne=10^23 m^-3). Further experimentation at these optimized parameters are expected to produce plasmas that are both robust to experimental fluctuation and highly sensitive to sample stoichiometry, approaching the 0.1mol% threshold for ceramic YAG fabrication. This study (1) advances LIBS for improving YAG fabrication for the $2.2 billion solid-state laser industry (2) validates the general notion that optical emission spectroscopy (OES) can be used to improve the production processes of advanced materials and (3) presents dramatic cost savings potential in the optimization of experimental OES protocols and promises foreseeable benefits to analytical chemistry and materials science at large.

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ISEF 簡介

英特爾國際科學與工程大獎賽，簡稱 "ISEF"，由美國 Society for Science and the Public（科學和公共服務協會）主辦，英特爾公司冠名贊助，是全球規模最大、等級最高的中學生的科研科創賽事。ISEF 的學術活動學科包括了所有數學、自然科學、工程的全部領域和部分社會科學。ISEF 素有全球青少年科學學術活動的“世界杯”之美譽，旨在鼓勵學生團隊協作，開拓創新，長期專一深入地研究自己感興趣的課題。

學科簡介：化學 Chemistry

Studies exploring the science of the composition, structure, properties, and reactions of matter not involving biochemical systems.

Subcategories:

Analytical Chemistry?(ANC):?The study of the separation, identification, and quantification of the chemical components of materials.

Computational Chemistry?(COM):?A study that applies the discipline and techniques of computer science and mathematics to solve large and complex problems in Chemistry.

Environmental Chemistry?(ENV):?The study of chemical species in the natural environment, including the effects of human activities, such as the design of products and processes that reduce or eliminate the use or generation of hazardous substances.

Inorganic Chemistry?(INO):?The study of the properties and reactions of inorganic and organometallic compounds.

Materials Chemistry?(MAT):?The chemical study of the design, synthesis and properties of substances, including condensed phases (solids, liquids, polymers) and interfaces, with a useful or potentially useful function, such as catalysis or solar energy.

Organic Chemistry?(ORG):?The study of carbon-containing compounds, including hydrocarbons and their derivatives.

Physical Chemistry?(PHC):?The study of the fundamental physical basis of chemical systems and processes, including chemical kinetics, chemical thermodynamics, electrochemistry, photochemistry, spectroscopy, statistical mechanics and astro-chemistry.

Other?(OTH):?Studies that cannot be assigned to one of the above subcategories. If the project involves multiple subcategories, the principal subcategory should be chosen instead of Other.

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