Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

26.9K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
26.9K
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

16.9K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
16.9K
First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

8.3K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
8.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.6K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.6K
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

1.0K
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
1.0K
Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

656
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
656

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Bottom-Up Synthesis and Active Assembly of DNA Networks by Biomolecular Nanomachines.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same author

Synthesis, Crystal Structure, and Electronic Structure of a Binary-Ordered Phase Mn<sub>16</sub>Ge<sub>7</sub>.

Inorganic chemistry·2026
Same author

Integrating DEM and flow stress factors to identify sedimentation-transportation zone in the eastern Himalayan foothill region.

The Science of the total environment·2026
Same author

Competing effect of disorder on phase separation in active systems.

Physical review. E·2026
Same author

Spontaneous rotation of an inclusion in a chiral active bath.

Soft matter·2025
Same author

Polarization-Driven Charge Frustration and Emergent Phases in the One-Dimensional Extended Hubbard Model.

Physical review letters·2025

Related Experiment Video

Updated: Feb 25, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

7.7K

Order-disorder transition in active nematic: A lattice model study.

Rakesh Das1, Manoranjan Kumar2, Shradha Mishra3,4

  • 1S N Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata, 700106, India. rakesh.das@bose.res.in.

Scientific Reports
|August 3, 2017
PubMed
Summary

This study introduces an active nematic model with self-propelled particles, revealing distinct ordering states influenced by density and temperature. The active system exhibits unique transitions compared to equilibrium models.

More Related Videos

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

6.9K
Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

3.2K

Related Experiment Videos

Last Updated: Feb 25, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

7.7K
High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

6.9K
Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

3.2K

Area of Science:

  • Statistical mechanics
  • Soft matter physics
  • Non-equilibrium systems

Background:

  • Active nematics are systems of self-propelled particles exhibiting orientational order.
  • Understanding their phase behavior is crucial for materials science and biology.
  • Equilibrium models provide a baseline for comparison but don't capture active dynamics.

Purpose of the Study:

  • To introduce and analyze a lattice model for active nematics.
  • To investigate ordering states in the density-temperature parameter space.
  • To compare the active model's behavior with its equilibrium counterpart.

Main Methods:

  • Development of a lattice model for self-propelled apolar particles.
  • Utilizing the Lebwohl-Lasher model for particle interactions.
  • Simulating and analyzing system behavior across density and temperature variations.

Main Results:

  • Identified distinct states: disordered isotropic, locally ordered inhomogeneous mixed, and bistability between mixed and globally ordered states.
  • Observed a density-driven transition from isotropic to inhomogeneous mixed state with a jump in order parameter at low temperatures.
  • Demonstrated that transition densities and order parameter jumps differ from equilibrium models.

Conclusions:

  • The interplay of activity, thermal fluctuations, and density dictates the phase behavior of active nematics.
  • The active nematic model exhibits unique ordering and transition dynamics not found in equilibrium systems.
  • A comprehensive phase diagram for the active nematic in the density-temperature plane was constructed.