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Leveling is a surveying procedure used to determine elevation differences between distant points. Elevation refers to the vertical distance above or below a reference datum, typically mean sea level (MSL). In the United States, elevations are often referenced to the mean sea level station at Father Point Rimouski along the St. Lawrence Seaway. To make the datum accessible, permanent markers are established throughout the region. These markers, called benchmarks, have known elevations. If the...
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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Profile leveling and cross-sections are surveying methods used to determine and document terrain elevations for infrastructure projects such as highways, railroads, canals, and pipelines. These methods provide data for earthwork planning and alignment of proposed routes.  Profile leveling involves measuring elevations along a fixed line to create a vertical terrain profile. A surveyor sets up a leveling instrument at the benchmark (BM) and records a backsight (BS) to determine the...
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Enfoque capa por capa para obtener plaquetas de caolín altamente orientadas en superficies

Rihab Masmoudi1,2, Brian G Frederick1,2, Luke Doucette2

  • 1Department of Chemistry, University of Maine, Orono 04469-5706, Maine, United States.

Langmuir : the ACS journal of surfaces and colloids
|August 23, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un método capa por capa para alinear las plaquetas de caolín, creando recubrimientos de barrera de oxígeno efectivos. Esta técnica ofrece una forma sencilla de obtener películas de caolín altamente orientadas en diversos sustratos.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Química de las superficies

Sus antecedentes:

  • El bajo costo y la alta relación de aspecto del caolín lo hacen adecuado para recubrimientos de barrera de oxígeno.
  • Lograr propiedades efectivas de barrera de oxígeno requiere plaquetas de caolín alineadas, lo que ha sido un desafío significativo.
  • Los métodos existentes para la alineación del caolín son complejos o ineficientes.

Objetivo del estudio:

  • Desarrollar un enfoque simple capa por capa (LBL) para la fabricación de películas de caolín altamente orientadas.
  • Para demostrar la eficacia del método LBL en varios sustratos como el vidrio, el silicio y el acero.
  • Caracterizar la orientación y las propiedades de las películas de caolín resultantes.

Principales métodos:

  • Deposición secuencial de sustratos en suspensiones catiónicas y aniónicas de caolín.
  • Preparación de suspensiones de caolín catiónico utilizando cloruro de polidialdimetilamonio.
  • Preparación de suspensiones de caolín aniónico utilizando poliacrilato de sodio.

Principales resultados:

  • Produjo con éxito películas de caolín altamente orientadas en sustratos de vidrio, silicio y acero 304.
  • Se ha demostrado la deposición controlada de partículas de caolín con potenciales y tamaños zeta específicos.
  • SEM, espectroscopia IR y difracción de rayos X confirmaron plaquetas de caolín alineadas paralelamente a los sustratos.

Conclusiones:

  • El enfoque LBL es un método viable y simple para crear películas de caolín orientadas.
  • Esta técnica permite la fabricación controlada de recubrimientos de caolín con aplicaciones potenciales de barrera de oxígeno.
  • Las películas de caolín alineadas son prometedoras para aplicaciones de materiales avanzados que requieren propiedades de superficie específicas.