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Diffusion01:12

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion of a Janus nanoparticle in an explicit solvent: A molecular dynamics simulation study.

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Simulations show that altering Janus particle surface energy impacts diffusion. Decreasing nonwetting hemisphere energy enhances translational and rotational motion in dense fluids.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding particle dynamics in complex fluids is crucial for designing advanced materials.
  • Janus particles, with distinct surface properties, exhibit unique behaviors compared to homogeneous particles.
  • Dense fluids present unique challenges for solute motion due to strong particle-particle interactions.

Purpose of the Study:

  • To investigate the translational and rotational diffusion of a single Janus particle in a dense Lennard-Jones fluid.
  • To determine how varying surface energy at the nonwetting hemisphere affects particle dynamics.
  • To compare the diffusion behavior of Janus particles with that of homogeneous particles.

Main Methods:

  • Utilizing molecular dynamics simulations to model particle interactions.
  • Analyzing particle dynamics through time-dependent orientation tensor and displacement.
  • Calculating translational and angular velocity autocorrelation functions.

Main Results:

  • Both translational and rotational diffusion coefficients increase as surface energy decreases at the nonwetting hemisphere.
  • The nonwetting hemisphere of the Janus particle shows a tendency to rotate towards the displacement vector.
  • This rotational behavior differs from that observed in homogeneous particles.

Conclusions:

  • Surface wettability significantly influences the diffusion characteristics of Janus particles in dense fluids.
  • The observed rotational preference offers insights into anisotropic particle behavior.
  • Findings contribute to the fundamental understanding of interfacial phenomena and particle transport in complex media.