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Spongy Bone01:09

Spongy Bone

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Compact Bone01:27

Compact Bone

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Torsion of Noncircular Members01:16

Torsion of Noncircular Members

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Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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Updated: May 25, 2025

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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Tessellado con pequeñas pesas

Brian A Korgel1

  • 1McKetta Department of Chemical Engineering, University of Texas, Austin, TX, USA.

Science (New York, N.Y.)
|February 27, 2025
PubMed
Resumen

Los científicos usaron superficies curvas para guiar pequeños cristales, llamados nanocristales, para formar patrones intrincados. Este descubrimiento abre nuevas vías para el ensamblaje y diseño de nanomateriales avanzados.

Área de la Ciencia:

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

Sus antecedentes:

  • El control preciso de la disposición de las nanopartículas es crucial para el desarrollo de materiales funcionales avanzados.
  • Los métodos existentes para el ensamblaje de nanocristales a menudo carecen de escalabilidad o versatilidad.

Objetivo del estudio:

  • Investigar el uso de superficies curvas para el autoensamblaje de nanocristales dirigidos.
  • Para demostrar la formación de patrones complejos a nanoescala utilizando plantillas cóncavas y convexas.

Principales métodos:

  • Fabricación de superficies cóncavas y convexas a microescala.
  • La deposición y el ensamblaje controlados de nanocristales coloidales en estas superficies con patrones.
  • Caracterización de estructuras ensambladas mediante microscopía electrónica.

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Principales resultados:

  • Las superficies cóncavas confinan y dirigen efectivamente el ensamblaje de nanocristales en matrices ordenadas.
  • Las superficies convexas facilitaron la formación de arreglos nanocristalinos específicos y no compactados.
  • Los patrones complejos, multicapa y jerárquicos se lograron a través del control de la topografía de superficie.

Conclusiones:

  • Las superficies con patrones topográficos, tanto cóncavas como convexas, sirven como plantillas efectivas para el ensamblaje de nanocristales dirigidos.
  • Este enfoque ofrece una estrategia versátil para crear nanoestructuras complejas con aplicaciones potenciales en óptica, electrónica y catálisis.
  • Los hallazgos destacan la importancia de la geometría de la superficie en la autoorganización a nanoescala.