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Related Concept Videos

Spongy Bone01:09

Spongy Bone

4.0K
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

11.0K
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...
159
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

155
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.
155
Torsion of Noncircular Members01:16

Torsion of Noncircular Members

120
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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Related Experiment Video

Updated: May 25, 2025

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

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Tessellated with tiny dumbbells.

Brian A Korgel1

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

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

Scientists used curved surfaces to guide tiny crystals, called nanocrystals, into forming intricate patterns. This discovery opens new avenues for advanced nanomaterial assembly and design.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Precise control over nanoparticle arrangement is crucial for developing advanced functional materials.
  • Existing methods for nanocrystal assembly often lack scalability or versatility.

Purpose of the Study:

  • To investigate the use of curved surfaces for directed nanocrystal self-assembly.
  • To demonstrate the formation of complex nanoscale patterns using concave and convex templates.

Main Methods:

  • Fabrication of micro-scale concave and convex surfaces.
  • Controlled deposition and assembly of colloidal nanocrystals onto these patterned surfaces.
  • Characterization of assembled structures using electron microscopy.

Main Results:

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Related Experiment Videos

Last Updated: May 25, 2025

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  • Concave surfaces effectively confined and directed nanocrystal assembly into ordered arrays.
  • Convex surfaces facilitated the formation of specific, non-close-packed nanocrystal arrangements.
  • Complex, multi-layered, and hierarchical patterns were achieved through surface topography control.

Conclusions:

  • Topographically patterned surfaces, both concave and convex, serve as effective templates for directed nanocrystal assembly.
  • This approach offers a versatile strategy for creating complex nanostructures with potential applications in optics, electronics, and catalysis.
  • The findings highlight the importance of surface geometry in nanoscale self-organization.