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Thin-Layer Chromatography- Concept

JoVE 11207

Chromatography


Chromatography is a technique used in organic chemistry to separate compounds in a mixture based on their differences in solubility between two different phases. The concept is similar to liquid-liquid extraction, except in chromatography, the two phases consist of the stationary phase and the mobile phase. The stationary phase is a solid —…

 Lab: Chemistry

Single and Two-phase Flow in a Packed Bed Reactor

JoVE 10431

Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA


The goal of this experiment is to determine the magnitude of maldistribution in typical packed bed reactors in both single phase and two-phase (gas-liquid) flow and evaluate the effects of this maldistribution on…

 Chemical Engineering

Column Chromatography- Concept

JoVE 11210

Column Chromatography


Multiple techniques exist to purify and separate compounds in an organic chemistry laboratory. One of the most reliable separation techniques for microscale separations, where less than 10 grams of the compound is available for analysis, is column chromatography. This technique separates compounds in a mixture based on their physical…

 Lab: Chemistry

Extraction- Concept

JoVE 11198

Extraction


Extraction is a common technique used in organic chemistry to isolate a target compound. In the extraction process, a solute is transferred from one phase to another to separate it from unreacted starting materials or impurities. Extraction is also used to facilitate the isolation of a solute from a reaction solvent that is difficult to remove by…

 Lab: Chemistry

Solid Phase Synthesis

JoVE 10349

Source: Vy M. Dong and Diane Le, Department of Chemistry, University of California, Irvine, CA


Merrifield's solid-phase synthesis is a Nobel Prize winning invention where a reactant molecule is bound on a solid support and undergoes successive chemical reactions to form a desired compound. When the molecules are bound to a solid…

 Organic Chemistry II

Single Phase Transformers

JoVE 10151

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.


Transformers are stationary electric machines that step up or down AC voltage. They are typically formed of primary and secondary coils or windings, where the voltage on the primary is stepped up or down at the secondary, or the other way…

 Electrical Engineering

Single Phase Inverter

JoVE 10250

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.


DC power is unidirectional and flows in one direction, whereas, AC current alternates directions at a frequency of 50-60 Hz. Most common electronic devices are designed to run off of AC power; therefore an input DC source must be inverted to AC. …

 Electrical Engineering

Liquid Phase Reactor: Sucrose Inversion

JoVE 10408

Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA


Both batch and continuous flow reactors are used in catalytic reactions. Packed beds, which use solid catalysts and a continuous flow, are the most common configuration. In the absence of an extensive recycle…

 Chemical Engineering

Directional Solidification and Phase Stabilization

JoVE 10485

Source: Sina Shahbazmohamadi and Peiman Shahbeigi-Roodposhti-Roodposhti, School of Engineering, University of Connecticut, Storrs, CT


Directional solidification zone melting is a metallurgical process in which a narrow region of a crystal (usually in the form of bar) is melted. The furnace moves along the rod shape sample, meaning that the …

 Materials Engineering

Single Phase Rectifiers

JoVE 10257

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.


A DC power supply is generally considered to be a device that supplies DC, or unidirectional, voltage and current. Batteries are one such power supply, however, they are limited in terms of lifetime and expense. An alternative method to…

 Electrical Engineering
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