Light Enhanced Hydrofluoric Acid Passivation: A Sensitive Technique for Detecting Bulk Silicon Defects
Source: Robert M. Rioux & Taslima A. Zaman, Pennsylvania State University, University Park, PA
A mineral acid (or inorganic acid) is defined as a water-soluble acid derived from inorganic minerals by chemical reaction as opposed to organic acids (e.g. acetic acid, formic acid). Examples of mineral acids include: • Boric acid (CAS No.10043-35-3) • Chromic acid (CAS No.1333-82-0) • Hydrochloric acid (CAS No.7647-01-0) • Hydrofluoric acid (CAS No. 7664-39-3) • Nitric acid (CAS No. 7697-37-2) • Perchloric acid (CAS No. 7601-90-3) • Phosphoric acid (CAS No.7664-38-2) • Sulfuric acid (CAS No.7664-93-9) Mineral acids are commonly found in research laboratories and their corrosive nature makes them a significant safety risk. Since they are important reagents in the research laboratory and often do not have substitutes, it is important that they are handled properly and with care. Some acids are even shock sensitive and under certain conditions may cause explosions (i.e., salts of perchloric acid).…
1Department of Chemistry, Michigan State University, 2Department of BioHealth Informatics, Indiana University-Purdue University Indianapolis, 3Center for Computational Biology and Bioinformatics, Indiana University School of Medicine
1Department of Chemistry and Biochemistry, University of Notre Dame, 2Department of Chemical and Biomolecular Engineering, University of Notre Dame, 3Department of Chemistry, Physics, and Engineering Studies, Chicago State University, 4Department of Technology, Ivy Tech Community College, South Bend, Indiana
1Department of Crop Sciences, University of Illinois Urbana-Champaign, 2Department of Land, Air and Water Resources, University of California Davis, 3Central Great Plains Resources Management Research, USDA ARS
1Department of Electrical and Computer Engineering, University of California, Davis, 2Digital Light Projection (DLP) Technology Development, Texas Instruments, 3Birck Nanotechnology Center and the Department of Electrical and Computer Engineering, Purdue University
1Unité Mixte de Physique CNRS/Thales, Université Paris-Saclay, 2Max Planck Institut für Mikrostrukturphysik, 3Department of Applied Physics, Tohoku University, 4Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid
1Institute of Chemistry, The Hebrew University of Jerusalem, 2Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
In this experiment, three soil macronutrients are chemically extracted, combined with color-based reagents, then analyzed using color to determine the nutrient concentration present in the soil sample.
Nitrogen, phosphorus, and potassium are the main components of soil fertilizer. These methods isolate each nutrient from the soil into a solution that can be analyzed using turbidity and color to determine the concentration of nutrients present in the soil sample. Knowing present concentration informs environmental scientists of a nutrient deficiency or surplus in soils used to support plant production, and also provides general insight into basic biogeochemical cycles of an ecosystem.…
1Department of Pharmacy, National University of Singapore, 2Singapore University of Technology and Design, 3Institute of Bioengineering and Nanotechnology, Agency for Science, Technology and Research (A*STAR), 4Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 5Mechanobiology Institute, National University of Singapore
1Department of Pediatrics, Emory University School of Medicine, 2Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 3Aflac Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta, 4Winship Cancer Institute of Emory University
The fabrication of BioMEMs devices is often done using a microfabrication technique called photolithography. This widely used method utilizes light to transfer a pattern onto a silicon wafer, and provides the basis for the fabrication of many types of BioMEMs devices.
This video presents the photolithography technique, shows how the process is performed in the clean room, and introduces some applications of the process. …