Video Experimental Relacionado
Updated: Jul 7, 2026
07:17
Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
Reacciones inducidas por cavitación en dióxido de carbono a alta presión
M W A Kuijpers1, D van Eck, M F Kemmere
1Process Development Group, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, Netherlands.
Science (New York, N.Y.)
|December 10, 2002
Resumen
El ultrasonido puede crear radicales en el dióxido de carbono líquido (CO2) para la polimerización. Esto demuestra las reacciones sonoquímicas en fluidos densos, ofreciendo una alternativa ecológica a los disolventes orgánicos.
Área de la Ciencia:
- Química verde es la química verde.
- La sonoquímica es la sonoquímica.
- La ciencia de los polímeros es la ciencia de los polímeros.
Sus antecedentes:
- Los disolventes orgánicos convencionales presentan riesgos ambientales.
- El dióxido de carbono de fase densa (CO2) es un disolvente alternativo ambientalmente benigno.
- La sonoquímica utiliza el ultrasonido para iniciar reacciones químicas.
Objetivo del estudio:
- Para demostrar la formación de radicales inducida por ultrasonido en dióxido de carbono líquido.
- Explorar el potencial del uso de CO2 como disolvente para la polimerización sonoquímica.
- Evaluar la viabilidad de reemplazar los disolventes orgánicos tradicionales con CO2.
Principales métodos:
- Se investigó la formación de radicales inducida por ultrasonido en CO2 líquido.
- Utilizó un modelo dinámico de burbujas para predecir la formación de puntos calientes.
- Se realizó la polimerización del metacrilato de metilo en CO2 a través de radicales inducidos por la cavitación.
Principales resultados:
- Se logra la formación de radicales en CO2 líquido a baja intensidad acústica debido a la alta presión de vapor de CO2.
- Predicción de la formación de puntos calientes en el colapso de la burbuja utilizando un modelo dinámico de burbujas.
- Polímeros de alto peso molecular sintetizados a través de la polimerización sonoquímica del metacrilato de metilo en CO2.
Conclusiones:
- Las reacciones sonoquímicas son factibles en fluidos de fase densa como el CO2 líquido.
- El CO2 ambientalmente benigno puede reemplazar a los disolventes orgánicos peligrosos en varios sistemas de reacción.
- Este enfoque ofrece una vía sostenible para la síntesis química y la producción de polímeros.
Videos de Conceptos Relacionados
01:19Chemical Reactions
A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
01:24Redox Reactions
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
02:26Chemical Reactions
A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
02:12Enthalpy and Heat of Reaction
Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
01:23Introduction to Chemical Reactions
All chemical reactions begin with a reactant, the general term for one or more substances entering the reaction. Sodium and chloride ions, for example, are the reactants in the production of table salt. One or more substances produced by a chemical reaction are called the product. Chemical reactions follow the law of conservation of mass, which means that matter cannot be created nor destroyed in a chemical reaction. The components of the reactants—the number of atoms and the elements—are all...
01:27Redox Reactions
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...