Sphere-to-rod Transition
Sphere-to-rod Transition - Related Videos
09:23
Turbulence Sphere Method: Evaluating Wind Tunnel Flow Quality
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2023
Source: Jose Roberto Moreto and Xiaofeng Liu, Department of Aerospace Engineering, San Diego State University, San Diego, CA Wind tunnel tests are useful in the design of vehicles and structures that are subjected to airflow during their use. Wind tunnel data are generated by applying a controlled air flow to a model of the object being studied. The test model usually has a similar geometry but is a smaller scale compared to the full-sized object. To ensure accurate and useful data is collected...
02:31
Phase Transitions
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2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
01:58
Cooperative Allosteric Transitions
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2020
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
02:58
Properties of Transition Metals
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2020
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals. Figure 1: Periodic Table. The transition metals are located in groups 3–11 of the periodic table. The inner transition metals are in the two rows...
02:26
Generating 3D Co-culture Spheres of Astrocytes and Neurons to Induce Synapse Formation
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2025
This video demonstrates a procedure for co-culturing the astrocytes and neurons to form 3D spheres. These 3D spheres provide a distinct platform for examining synapse formation and neural network integration, thereby serving as a potential model for research in developmental neuroscience, neurodegenerative diseases, and neuropharmacological interventions.
FAQs
The transition is driven by a shift from uniform expansion or deformation toward extension along one axis. Surface energy can favor a new shape, while chemical conditions, confinement, or processing kinetics can make directional growth more favorable. These factors alter how the structure develops, so controlling them provides a way to promote or suppress elongation during engineering processes.
Surface energy affects which particle shape is energetically favored, whereas processing kinetics influence how quickly and in what direction material develops. When kinetic conditions favor extension more strongly than uniform growth, elongated structures can emerge. The resulting balance helps determine whether an engineered system remains relatively isotropic or develops a higher-aspect-ratio morphology.
Aspect ratio, the relationship between length and width, changes the structure’s anisotropy and physical behavior. A rod-like form also has a different surface area compared with a sphere, which can modify how the material interacts with its surroundings. These changes are important when optical, catalytic, electronic, or transport performance depends on particle geometry.
Both confinement and chemical conditions can encourage directional development, but they influence the transformation through different types of control. Chemical conditions alter the environment in which growth or deformation occurs, while confinement restricts available space and can favor extension along an accessible direction. In engineered systems, either factor may shift morphology away from uniform expansion.
Control centers on adjusting the factors that determine whether development remains uniform or becomes directional. Engineers can manage surface-energy conditions, chemical conditions, confinement, and processing kinetics, then assess the resulting morphology and aspect ratio. This approach links processing choices to shape outcomes, allowing researchers to target particle structures suited to specific optical, catalytic, electronic, or transport requirements.
Applications include nanoparticle morphology, colloidal assembly, mechanical structures, and functional materials. In each case, changing geometry can influence how components assemble or how a material behaves physically. Shape control may therefore support improved optical, catalytic, electronic, or transport performance, especially when the intended function depends on surface area, anisotropy, or aspect ratio.
Researchers should examine the resulting shape, surface area, anisotropy, and aspect ratio because these features connect the transformation to physical behavior. They can then relate morphology to performance in optical, catalytic, electronic, or transport settings. This evaluation helps determine whether the selected chemical, confinement, surface-energy, or processing conditions produced a useful engineered structure.