Vacuum Pressure Cycling
Vacuum Pressure Cycling - Related Videos
06:20
Proper Operation of Vacuum Based Equipment
0 Views •
2023
Source: Robert M. Rioux, Ajay Sathe & Zhifeng Chen, Pennsylvania State University, University Park, PA Vacuum is required for a number of laboratory procedures. This is most routinely achieved in the laboratory by the use of vacuum pumps. In addition to working at low pressures, vacuum pumps can also be used to enable rapid changing of the atmospheres in a reactor or flask by evacuation and backfilling.
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
0 Views •
Cited by 5 •
2013
The laser heated diamond anvil cell combined with synchrotron micro-diffraction techniques allows researchers to explore the nature and properties of new phases of matter at extreme pressure and temperature (PT) conditions. Heterogeneous samples can be characterized in situ under high pressure by 2D mapping and combined powder, single-crystal and multigrain diffraction approaches.
08:18
Degassing Liquids with Freeze-Pump-Thaw Cycling
0 Views •
2023
Source: Laboratory of Dr. Neil Branda — Simon Fraser University Degassing refers to the process by which dissolved gases are removed from a liquid. The presence of dissolved gases such as oxygen or carbon dioxide can impede chemical reactions that utilize sensitive reagents, interfere with spectroscopic measurements, or can induce unwanted bubble formation. A number of different techniques are available for degassing liquids; some of these include heating, ultrasonic agitation, chemical...
03:03
Inoculating a Bacterial Pathogen into Arabidopsis Leaves via Vacuum Infiltration
0 Views •
2026
Source: Rufián, J. S., et.al. Single-Cell Analysis of the Expression of Pseudomonas syringae Genes within the Plant Tissue. J. Vis. Exp. (2022)This video demonstrates a vacuum infiltration method to introduce a bacterial pathogen into Arabidopsis plant leaves. The approach uses a prepared bacterial suspension and vacuum pulses to enable uniform entry through stomata, resulting in controlled leaf infection.
07:49
Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions
0 Views •
Cited by 11 •
2016
The coefficient of restitution is a parameter that describes the loss of kinetic energy during collision. Here, a free-fall setup under vacuum conditions is developed to be able to determine the coefficient of restitution parameter for particles in micrometer range with high impact velocities.
FAQs
During the reduced-pressure phase, dissolved or trapped gases expand, allowing them to escape from liquids or porous structures. When pressure is restored, the resulting change can promote liquid movement into pores and improve contact with solids. This alternating sequence supports both degassing and impregnation rather than treating pressure as a single fixed condition.
Pressure level, cycle duration, temperature, and material compatibility all affect performance. Inadequate conditions may leave gases behind or limit liquid penetration, whereas poorly controlled changes can cause foaming, solvent loss, or structural damage. Adjusting these variables is therefore important for achieving reproducible treatment without compromising the chemical material or system.
Vacuum primarily encourages dissolved or trapped gases to expand and escape, but restoring pressure adds a complementary function. It can drive liquids into pores, improve liquid-solid contact, and support gas-liquid exchange. Repeating these contrasting conditions allows a process to address both gas removal and fluid movement within the same chemical preparation.
A general workflow places the compatible liquid, solid, or porous material under controlled reduced pressure, allows sufficient time for gas release or expansion, and then restores pressure to promote liquid movement or contact. The reduced-pressure and pressurized stages are repeated as needed, while pressure, duration, temperature, and material response are carefully controlled.
Chemists may apply the technique for solvent degassing, sample preparation, drying, extraction, or impregnation of porous materials. Its value depends on the desired outcome: removing bubbles and dissolved gases can improve reproducibility, while pressure-assisted liquid penetration can improve contact with solids. These uses make it relevant to both liquid handling and solid-material treatment.
For porous materials, reduced pressure can help remove gases occupying internal spaces, while restored pressure can drive liquid into those pores. That improved penetration and contact can support impregnation. In extraction or drying workflows, the same pressure changes help manage gases and liquids within the material, potentially improving process efficiency when conditions remain compatible.