Two-phase Systems
Two-phase Systems - Related Videos
10:11
Cell Co-culture Patterning Using Aqueous Two-phase Systems
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Cited by 32 •
2013
Aqueous two-phase systems were used to simultaneously pattern multiple populations of cells. This fast and easy method for cell patterning takes advantage of the phase separation of aqueous solutions of dextran and polyethylene glycol and the interfacial tension that exists between the two polymer solutions.
01:28
Phase Diagrams of Ternary Systems
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2026
Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
01:19
Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems
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2025
Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body. Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...
01:15
Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems
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2025
Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen. In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...
05:46
High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
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2014
The high pressure sapphire cell apparatus is a unique tool to study, without sampling, phase behavior under a wide range of pressures. Using a cathetometer, very precise volume measurements can be recorded to measure liquid expansion and phase composition. Thus, this synthetic method enables the study of (1) phase equilibria of multi-component mixtures and (2) the partition behavior of catalyst or model compounds as a function of pressure.
FAQs
The spatial arrangement of phases strongly influences resistance to flow. Gas and liquid may distribute differently within equipment or pipelines, changing how much pressure is lost as the mixture moves. Because phase distribution can shift with operating conditions, engineers evaluate flow patterns alongside pressure drop rather than treating the system as a uniform single-phase stream.
Interfacial area controls how much contact exists between the coexisting phases. A larger or more effectively distributed interface can support greater mass or heat transfer, while limited contact can restrict transport even when both phases are present. This relationship is central to designing reactors, heat exchangers, and separation equipment that rely on interaction between phases.
Changes in pressure, temperature, or composition can alter the distribution of phases and initiate processes such as evaporation, condensation, boiling, or dissolution. These shifts may also affect flow stability and transport rates. Engineering analysis therefore considers operating conditions as changing inputs, because a device may behave differently as the mixture moves through varying environments.
Stability indicates whether phase distribution and flow behavior remain predictable as operating conditions change. Unstable behavior can modify pressure drop, interfacial contact, and transport performance, making design predictions less reliable. Engineers account for stability when assessing equipment performance so that heat, mass, and material movement remain consistent with the intended process.
An evaluation begins by identifying the phases and the expected changes in pressure, temperature, and composition. Engineers then consider phase distribution, interfacial area, heat and mass transfer, flow patterns, pressure drop, and stability. Connecting these factors helps predict performance under changing conditions and supports decisions about the design of devices or processes.
Applications include heat exchangers, refrigeration equipment, chemical reactors, pipelines, and separation processes. In these settings, phase interaction or phase transition can improve energy or material transport. The relevant design emphasis differs by application: engineers may prioritize heat transfer, pressure behavior, reaction contact, pipeline performance, or separation effectiveness.
Evaporation, condensation, and boiling can couple phase change with heat transport, while dissolution can support movement of material between phases. These mechanisms allow engineered equipment to use changes in phase state as part of its operating process. Their benefits depend on controlling phase distribution, operating conditions, pressure drop, and stability within the system.
Analysis can show how phases are distributed, how much pressure is lost during flow, and how effectively heat or mass moves between phases. It can also indicate how changing pressure, temperature, or composition may affect stability and performance. This information helps engineers predict operation and identify conditions that support safer, more efficient designs.