Drying Procedure
Drying Procedure - Related Videos
01:30
Dry Friction
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2023
Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible. To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
01:21
Drying Shrinkage
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2024
When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage. A portion of this drying shrinkage can be reversed; if the concrete is...
01:21
Characteristics of Dry Friction
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2023
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground. Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
08:38
Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS
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Cited by 28 •
2015
Here we describe a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) assay to quantify the immunosuppressant tacrolimus in dried blood spots using a simple manual protein precipitation step and online column extraction.
00:52
Washing, Drying, and Ignition of Precipitates
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2024
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
FAQs
Control of temperature, time, pressure, and airflow determines how efficiently moisture leaves while protecting the material. Heating and airflow promote evaporation, whereas reduced pressure can support solvent removal under controlled conditions. The selected combination must remain mild enough to limit decomposition, oxidation, or loss of the desired compound, making process conditions central to reliable chemical preparation.
Desiccant contact removes volatile material by providing a drying environment rather than relying solely on heat. This option is useful when a substance or product could be affected by elevated temperature, although the drying conditions still require control. The choice among desiccant contact, controlled heating, reduced pressure, or airflow depends on material stability and the desired outcome.
An appropriate endpoint is reached when the material has been dried sufficiently for its intended use without compromising its composition. This balance matters because residual solvent can distort mass and moisture measurements, while excessive treatment may cause decomposition, oxidation, or loss of compound. Endpoint control therefore links the physical drying process to accurate characterization and reproducible results.
Residual water or solvent adds mass that does not belong to the target material, which can undermine gravimetric measurements and obscure the actual composition. Drying supports a stable, accurately characterized sample before weighing. It also helps researchers interpret product purity and reaction outcomes more reliably in subsequent chemistry.
Researchers should control temperature, time, pressure, and airflow while choosing conditions that match the substance being treated. The procedure can use controlled heating, reduced pressure, airflow, or contact with a desiccant. Monitoring these variables helps remove volatile material efficiently and reduces the chance of decomposition, oxidation, or unwanted compound loss.
Chemists apply drying to reagents, precipitates, glassware, and synthesized products. The purpose differs by material: preparation for later reactions, removal of residual volatile material before weighing or storage, or support for assessing moisture content and reaction outcomes. In each case, conditions are selected to preserve the material while improving its stability or characterization.
It is especially important before weighing, storage, or subsequent reactions, when residual water or solvent could affect the material's measured mass, stability, or behavior. Drying prepares a more stable sample and can improve product characterization. Applying it after synthesis or precipitation also helps researchers evaluate purity and reaction outcomes.