Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

1.3K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.3K
Heating and Cooling Curves02:44

Heating and Cooling Curves

23.2K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
23.2K
Freezing Point Depression and Boiling Point Elevation03:12

Freezing Point Depression and Boiling Point Elevation

35.4K
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
35.4K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

12.6K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
12.6K
Precipitation Processes01:12

Precipitation Processes

555
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
555
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

1.2K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.2K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Tuning of Bloch modes, diffraction, and refraction by two-dimensional lattice reconfiguration.

Optics letters·2010
Same author

[Construction of DNA vaccine pcDNA3.1(+)/tetraspanin 2-A against Schistosoma japonicum and its immune-protective effect in mice].

Zhongguo ji sheng chong xue yu ji sheng chong bing za zhi = Chinese journal of parasitology & parasitic diseases·2010
Same author

Fluorescence-enhanced organogels and mesomorphic superstructure based on hydrazine derivatives.

Langmuir : the ACS journal of surfaces and colloids·2010
Same author

Cancer-derived mutations in the fibronectin III repeats of PTPRT/PTPrho inhibit cell-cell aggregation.

Cell communication & adhesion·2010
Same author

Simulation of wavelength conversion based on integrated saturable absorber.

Applied optics·2010
Same author

Traditional Chinese medicine in the treatment of rheumatoid arthritis: a general review.

Rheumatology international·2010

Video Experimental Relacionado

Updated: Aug 19, 2025

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
08:01

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

Published on: August 18, 2022

3.1K

Cada vez más duro en el ultrafrío

Peng Zhang1, Zhe-Feng Zhang1

  • 1Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.

Science (New York, N.Y.)
|December 1, 2022
PubMed
Resumen

Ciertas aleaciones metálicas exhiben una dureza notable cuando se exponen al helio líquido extremadamente frío. Este hallazgo es crucial para las aplicaciones criogénicas y la investigación en ciencias de los materiales.

Área de la Ciencia:

  • Ciencias de los materiales
  • Las criogénicas
  • Trabajos de metalurgia

Sus antecedentes:

  • Comprender el comportamiento de los materiales a temperaturas extremadamente bajas es fundamental para la ingeniería avanzada.
  • Las propiedades únicas del helio líquido (4.2 K) presentan desafíos significativos para la integridad del material.

Objetivo del estudio:

  • Investigar las propiedades mecánicas, específicamente la tenacidad, de aleaciones seleccionadas en un entorno de helio líquido.
  • Identificar aleaciones que mantengan la integridad estructural y el rendimiento en condiciones criogénicas.

Principales métodos:

  • Pruebas de tracción de varias muestras de aleación.
  • Prueba de impacto a temperaturas de helio líquido.
  • Análisis microestructural de las muestras posteriores al ensayo.

Más Videos Relacionados

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
08:16

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine

Published on: March 13, 2017

14.0K
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.5K

Videos de Experimentos Relacionados

Last Updated: Aug 19, 2025

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
08:01

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

Published on: August 18, 2022

3.1K
Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
08:16

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine

Published on: March 13, 2017

14.0K
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.5K

Principales resultados:

  • Las aleaciones específicas demostraron una resistencia significativamente mejorada en comparación con su rendimiento a temperatura ambiente.
  • El análisis de las fracturas reveló mecanismos microstruturales que contribuyen a esta excepcional dureza criogénica.
  • Otras aleaciones mostraron una marcada disminución de la dureza, lo que pone de relieve la importancia de la composición de la aleación.

Conclusiones:

  • Ciertas aleaciones poseen una dureza superior en el helio líquido, lo que las hace adecuadas para aplicaciones criogénicas.
  • El diseño y la selección de aleaciones son fundamentales para garantizar la fiabilidad del material en entornos extremadamente fríos.
  • Se justifica una mayor investigación sobre los mecanismos fundamentales de la dureza criogénica.