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Atomic Force Microscopy01:08

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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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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
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Chemical Reactions in Aqueous Solutions03:03

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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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Transmission-based precautions are for patients infected or suspected to be infected (or colonized) with organisms posing a significant risk to others. The transmission precautions include airborne and protective environment precautions.
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An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Microscopia infrarroja fototérmica basada en microscopia de fuerza atómica para entornos acuosos utilizando celdas

Yasuhiko Fujita1, Mariko Takahashi1, Hirohmi Watanabe1

  • 1Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST) Kagamiyama 3-11-32 Higashihiroshima 739-0046 Japan Yasuhiko.fujita@aist.go.jp.

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Demostramos la resonancia inducida por fototermia (PTIR) basada en microscopia de fuerza atómica para polímeros hidratados en agua. Esta técnica detecta la hinchazón de polímeros analizando cambios en el espectro PTIR, ofreciendo nuevas perspectivas sobre el comportamiento de los polímeros.

Palabras clave:
microscopia infrarrojaresonancia inducida por fototermiapolímeros hidratadosmedio acuosohinchazón de polímerosceldas microfluídicasgrafeno

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Área de la Ciencia:

  • Ciencia de Materiales
  • Química de Polímeros
  • Espectroscopía

Sus antecedentes:

  • El estudio de polímeros hidratados en entornos acuosos presenta desafíos para las técnicas de caracterización tradicionales.
  • La microscopia de fuerza atómica (AFM) ofrece imágenes de superficie de alta resolución, pero su integración con métodos espectroscópicos en líquido es compleja.

Objetivo del estudio:

  • Desarrollar y demostrar un método novedoso para analizar polímeros hidratados en agua utilizando resonancia inducida por fototermia (PTIR) basada en AFM.
  • Investigar el potencial de la PTIR para detectar cambios en la estructura del polímero, como la hinchazón, en condiciones acuosas.

Principales métodos:

  • Se utilizaron celdas microfluídicas con una capa de grafeno atómicamente delgada como ventana transparente a los infrarrojos.
  • Se realizaron mediciones de resonancia inducida por fototermia (PTIR) en polímeros hidratados dentro de las celdas microfluídicas.
  • Se analizaron los cambios espectrales para identificar la hinchazón del polímero.

Principales resultados:

  • Se demostró con éxito la medición de PTIR en polímeros hidratados en un entorno acuoso.
  • Se observaron cambios distintos en el espectro de PTIR correlacionados con la hinchazón del polímero.
  • Se validó el uso de grafeno como una ventana eficaz transparente a los infrarrojos para PTIR microfluídica.

Conclusiones:

  • La PTIR basada en AFM es una técnica viable para caracterizar polímeros hidratados en soluciones acuosas.
  • La PTIR puede detectar eficazmente la hinchazón de polímeros analizando los desplazamientos espectrales.
  • Este método abre nuevas vías para estudiar la dinámica e interacciones de polímeros en condiciones biológicamente relevantes.