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An interesting force in everyday life is the force of drag on an object when it is moving in a fluid. Like friction, the drag force always opposes the motion of an object. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. For most large objects, such as cyclists, cars, and baseballs, that are not moving too...
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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Video Experimental Relacionado

Updated: Feb 8, 2026

High-Speed Atomic Force Microscopy Imaging of DNA Three-Point-Star Motif Self Assembly Using Photothermal Off-Resonance Tapping
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Microscopio de Fuerza Atómica Integral Fuera de Resonancia de Alta Velocidad

Kaixuan Wang1,2, Jialin Shi1, Peng Yu1

  • 1State Key Laboratory of Robotics and Intelligent Systems, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China.

Nano letters
|February 7, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Los científicos desarrollaron el modo integral fuera de resonancia (I-ORT) para la microscopía de fuerza atómica (AFM). Este nuevo método acelera significativamente la obtención de imágenes de materiales dinámicos sin perder calidad de datos.

Palabras clave:
microscopía de fuerza atómicaimagen de alta velocidadcaracterización nanomecánicatapping fuera de resonanciamaterial viscoelástico

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Área de la Ciencia:

  • Ciencia de Materiales
  • Nanotecnología
  • Ciencia de Biomateriales

Sus antecedentes:

  • La microscopía de fuerza atómica (AFM) permite el mapeo mecánico simultáneo y la caracterización topográfica.
  • El modo de tapping fuera de resonancia (ORT) en AFM proporciona doble funcionalidad pero sufre de bajas velocidades de imagen debido al retraso del bucle cerrado y la robustez limitada.
  • El estudio de especímenes dinámicos es un desafío con las limitaciones actuales del modo ORT.

Objetivo del estudio:

  • Mejorar la velocidad de imagen del modo ORT en AFM.
  • Superar las limitaciones del modo ORT convencional, específicamente el retraso del bucle cerrado y la robustez.
  • Permitir la caracterización de alta velocidad de materiales dinámicos y biomateriales.

Principales métodos:

  • Se desarrolló un modo integral de tapping fuera de resonancia (I-ORT) para AFM.
  • Se reemplazó el muestreo de punto fijo con el muestreo integral de la curva de interacción por encima de la línea base.
  • Se mantuvieron las mismas condiciones de excitación y detección que el modo ORT convencional.

Principales resultados:

  • Se logró un aumento de 10 veces en la velocidad de escaneo en comparación con el modo ORT convencional.
  • Se mantuvo la calidad de la caracterización de las propiedades mecánicas.
  • Se mitigó la interferencia impredecible de las interacciones sonda-muestra.

Conclusiones:

  • El modo I-ORT mejora significativamente la velocidad de imagen de AFM.
  • Este avance supera las limitaciones previas, permitiendo el estudio de especímenes dinámicos.
  • El modo I-ORT apoya la investigación de nanotecnología de alta gama al proporcionar una caracterización más rápida y de alta resolución.