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Related Concept Videos

Spherical Coordinates01:23

Spherical Coordinates

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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Spherical and Cylindrical Capacitor01:26

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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
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Gravity between Spherical Bodies01:27

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Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
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Gauss's Law: Spherical Symmetry01:26

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A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half has a...
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Formation of Species

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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Modulating Shape of Polyester Based Polymersomes using Osmotic Pressure
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Non-spherical polymersomes: formation and characterization.

Chin Ken Wong1, Martina H Stenzel, Pall Thordarson

  • 1School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia. chinkenwong@gmail.com m.stenzel@unsw.edu.au p.thordarson@unsw.edu.au.

Chemical Society Reviews
|June 13, 2019
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Summary
This summary is machine-generated.

Researchers are exploring shape control for polymersomes (self-assembled hollow sacs) beyond simple spheres. This advancement is key to unlocking their full potential in biomimicry and drug delivery applications.

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Area of Science:

  • Polymer science
  • Materials science
  • Nanotechnology

Background:

  • Polymersomes are self-assembled hollow membrane sacs with significant chemical and physical stability.
  • They offer structural versatility and surface modifiability, making them suitable for biomimicry and drug delivery.
  • Current applications are limited by a lack of shape control methods, unlike inorganic nanoparticles.

Purpose of the Study:

  • To summarize recent advancements in controlling the morphology of polymersomes.
  • To highlight methods for transforming spherical polymersomes into non-spherical structures.
  • To bridge the gap in understanding shape control between polymersomes and inorganic nanoparticles.

Main Methods:

  • Review of literature on polymersome morphology over the past decade.
  • Analysis of techniques enabling shape transformation in polymersomes.
  • Comparison with established shape control methods in inorganic nanoparticle synthesis.

Main Results:

  • Significant progress has been made in developing methods for non-spherical polymersome synthesis.
  • Understanding of morphological transformation pathways has increased.
  • The potential for diverse polymersome shapes is being realized.

Conclusions:

  • Harnessing shape control is crucial for maximizing polymersome applications in drug delivery and biomimicry.
  • Further research into shape-directing methods will enhance polymersome utility.
  • Non-spherical polymersomes represent a promising frontier in materials science.