Hot Injection Technique
Hot Injection Technique - Related Videos
10:13
Working with Hot and Cold Sources
0 Views •
2023
Source: Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Working with extreme temperatures, both high and low, is an integral part of many laboratory operations. For many, mentioning a laboratory instantly evokes the mental picture of a Bunsen burner. Bunsen burners and hot plates are used extensively in small and large operations in research laboratories and industries, thus making it necessary for all users to be aware of their safe handling...
09:17
Hot Wire Anemometry
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI Hot-wire anemometers have a very short time-response, which makes them ideal to measure rapidly fluctuating phenomena such as turbulent flows. The purpose of this experiment is to demonstrate the use of hot-wire anemometry.
07:34
Minimally-invasive Technique for Injection into Rat Optic Nerve
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Cited by 4 •
2015
Direct injection into the rat optic nerve is useful for regenerative research. We demonstrate a minimally-invasive technique for direct injection into a rat optic nerve that does not involve opening the skull. Using this method, surgical complications are minimized and recovery is more rapid.
01:20
Hot Weather Concreting
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2024
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing. Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
09:08
Facilitating Repeat Intracarotid Injections in Mouse Models by a Novel Injection Site Repair Technique
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Cited by 1 •
2024
Repair of the intracarotid artery in a mouse model after injection returns blood flow to the artery without negatively impacting the distribution of the injected material. Injection site repair facilitates subsequent injections through the same artery and prevents cerebral ischemia in mouse strains that lack a complete Circle of Willis.
FAQs
Rapid injection produces a sudden increase in precursor concentration within the heated reaction mixture. This change can trigger nucleation, the formation of initial crystal seeds, over a relatively defined stage of the synthesis. Continued heating then shifts the emphasis toward crystal growth, helping separate the conditions that establish particle number from those that determine subsequent development.
Nucleation establishes the initial population of developing crystals, while continued growth determines how those crystals increase in size and develop their shape. The balance between these stages strongly influences the final nanomaterial. Conditions that alter nucleation or growth rates can therefore change particle dimensions, morphology, and the uniformity of the resulting colloidal nanocrystal preparation.
The hot coordinating solvent provides the heated chemical environment in which precursor reactivity, nucleation, and growth occur. Stabilizing ligands create a ligand environment around the developing nanocrystals and help control their formation. Changing this environment can influence the resulting size, shape, and composition, making solvent and ligand selection important variables rather than passive parts of the reaction mixture.
Key controls include the injection temperature, precursor reactivity, ligand environment, and reaction time. Injection temperature affects the conditions under which nucleation begins, whereas precursor reactivity influences how readily the concentration change produces new crystal seeds. The ligand environment and duration of heating then help regulate growth, allowing researchers to tune the final nanocrystal characteristics.
A typical sequence begins by heating a coordinating solvent containing stabilizing ligands, followed by rapid introduction of a reactive precursor. The injection creates the concentration change associated with nucleation. The reaction is then maintained under heating so the developing crystals can grow. Researchers adjust the temperature, precursor properties, ligand environment, and reaction time to obtain the desired material.
The technique is used to prepare semiconductor quantum dots, metal nanoparticles, and other functional nanomaterials. Its value lies in the ability to influence size, shape, and composition through reaction conditions, producing materials suited to different research goals. Resulting nanomaterials support work in optoelectronics, catalysis, sensing, and biomedical research, where controlled properties are important.