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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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Partículas irregulares producidas por fusión coloidal

Zhe Gong1, Theodore Hueckel1, Gi-Ra Yi2

  • 1Molecular Design Institute, Department of Chemistry, New York University, 29 Washington Place, New York, New York 10003, USA.

Nature
|September 19, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un método de fusión coloidal escalable para crear partículas con patrones precisos. Este avance permite la realización experimental de alta fidelidad de estructuras coloidales complejas, superando los desafíos de fabricación anteriores.

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Área de la Ciencia:

  • Ciencias de las superficies y coloides
  • Ciencias de los materiales
  • Nanotecnología

Sus antecedentes:

  • Los parches superficiales en las partículas coloidales guían el autoensamblaje en estructuras complejas.
  • La síntesis experimental de partículas con patrones precisos sigue siendo un desafío significativo.
  • Los métodos sintéticos existentes a menudo producen pobres aproximaciones geométricas y bajos rendimientos.

Objetivo del estudio:

  • Introducir un método escalable y ajustable para la fabricación de partículas con parches funcionales.
  • Para permitir la ingeniería precisa de las morfologías de la superficie de las partículas.
  • Para cerrar la brecha entre el diseño computacional y la realización experimental de partículas irregulares.

Principales métodos:

  • Técnica de fusión coloidal que utiliza la dinámica de coordinación y las fuerzas de humedad.
  • Los grupos híbridos líquido-sólidos de ingeniería que evolucionan en partículas irregulares después de la adición de plastificante.
  • Controlar la morfología de las partículas a través de la minimización de la energía superficial.

Principales resultados:

  • Se logró una fabricación ajustable y escalable de partículas irregulares.
  • Se han identificado dos ramas de productos: partículas esféricas con parches líquidos y partículas con compartimentos líquidos facetados.
  • Demostró la capacidad de formar estructuras supracoloidales robustas y poliedros coloidales.

Conclusiones:

  • El método de fusión coloidal ofrece una estrategia escalable para la síntesis de alta fidelidad de partículas irregulares.
  • Esta técnica permite la recreación experimental de patrones de superficie diseñados por computación.
  • Permite el desarrollo de materiales avanzados autoensamblados con microestructuras predecibles.