Sublimation Curve
Sublimation Curve - Related Videos
05:39
Purification of Ferrocene by Sublimation
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University Sublimation, the direct phase transition of a solid into a gas without first becoming a liquid, takes place at temperatures and pressures lower than that of the compound's triple point (Figure 1).The process of sublimation can be utilized to purify both organic and inorganic solids. During the purification technique, a solid is heated directly into the gas-phase. All non-volatile impurities are left behind while the...
02:33
Phase Transitions: Sublimation and Deposition
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2020
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
01:03
Sublimation
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2024
Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
08:36
Sublimation of DAN Matrix for the Detection and Visualization of Gangliosides in Rat Brain Tissue for MALDI Imaging Mass Spectrometry
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Cited by 43 •
2017
A protocol for the sublimation of DAN matrix onto rat brain tissue for the detection of gangliosides using MALDI Imaging Mass Spectrometry is presented.
07:43
Calibration Curves
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error...
FAQs
Equal chemical potential means the solid and vapor are thermodynamically balanced at the pressure and temperature represented by the curve. Neither phase has a driving advantage under those conditions. This relationship identifies the equilibrium boundary rather than merely marking where vaporization or deposition can occur, making the curve useful for interpreting phase behavior.
A substance near the curve can respond to changed pressure-temperature conditions by favoring either the solid or vapor state. Conditions on one side support the solid more strongly, while conditions on the other side support the gas more strongly. The curve therefore provides a map for understanding when direct vaporization or deposition is possible.
The triple point marks the condition where solid, liquid, and gas phases coexist. It provides the boundary between the low-temperature, low-pressure solid-gas region represented by the sublimation curve and regions where the liquid phase becomes relevant. Consequently, the triple point helps place direct solid-vapor behavior within the complete phase diagram.
The curve identifies direct transitions between solid and vapor, so the liquid phase is not part of that equilibrium boundary. Ordinary vaporization concerns a liquid changing to vapor, whereas sublimation concerns a solid changing directly to vapor. This distinction helps chemists interpret which phase transition is indicated by a location on a pressure-temperature diagram.
For vacuum sublimation, the curve helps identify pressure-temperature conditions associated with direct solid-to-vapor behavior. Lower-pressure conditions are especially relevant because the sublimation curve extends through low-temperature, low-pressure regions. Using the diagram to select an appropriate region supports process planning while keeping the intended transition separate from conditions involving the liquid phase.
Sublimation-curve information helps interpret the conditions under which a solid can enter the vapor phase directly. In purification, that phase behavior provides a basis for treating a solid through sublimation rather than a liquid-mediated transition. The curve therefore supports selection and interpretation of conditions used in solid purification, as well as understanding the resulting phase changes.
Freeze-drying relies on understanding solid and vapor behavior under controlled pressure-temperature conditions. The sublimation curve helps interpret when direct transfer between those phases is possible without passing through the liquid phase. This makes it relevant for designing and analyzing freeze-drying conditions, particularly when researchers need to relate process behavior to a phase diagram.