Related Experiment Video
Updated: Feb 12, 2026
07:01
Improved Polydimethylsiloxane (PDMS) Double Casting via Silicone Oil Treatment for Densely Packed Microstructure Replication
Published on: July 18, 2025
1.7K
Dipolar cohesion in densely packed confined columns.
Yanyu Duan1, Zecheng Gan1,2, Hervé Mohrbach3
1Thrust of Advanced Materials, and Guangzhou Municipal Key Laboratory of Materials Informatics, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou 511453, China.
The Journal of Chemical Physics
|February 11, 2026
Summary
We studied magnetic spheres in cylinders. Their cohesion changes nonmonotonically with cylinder size due to competing forces, impacting soft matter experiments.
Area of Science:
- Physics
- Soft Matter Physics
- Materials Science
Background:
- Densely packed magnetic spheres form columnar assemblies.
- External magnetic fields align dipole moments.
- Confinement effects in cylinders are crucial for assembly behavior.
Purpose of the Study:
- Investigate the dipolar cohesion of magnetic spheres in cylinders.
- Analyze the dependence of cohesive energy on cylinder diameter.
- Understand the transition between zigzag and helical structures.
Main Methods:
- Theoretical investigation using exact geometrical solutions.
- Application of dipolar lattice sums.
- Analysis of cohesive energy as a function of cylinder diameter.
Main Results:
- Nonmonotonic cohesion in the zigzag regime due to competing radial and longitudinal pressures.
- Stabilization of dense zigzag structures driven by interchain correlations.
- Bell-shaped cohesive energy evolution and zigzag-helical quasi-degeneracy in the helical regime.
Conclusions:
- Cohesive energy is sensitive to cylinder diameter, influencing assembly morphology.
- Competing pressures dictate stability in confined magnetic assemblies.
- Results are relevant for field-responsive magnetic colloids and granular media.
Related Concept Videos
01:07Cohesion
59.6K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
On a...
59.6K
01:13Dense Connective Tissue
12.3K
Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
Dense Regular Connective Tissue
In dense regular connective tissue, fibers are arranged parallel to each other, enhancing its tensile strength and resistance to stretching in the direction of the fiber orientations. Ligaments and tendons are made of dense regular...
Dense Regular Connective Tissue
In dense regular connective tissue, fibers are arranged parallel to each other, enhancing its tensile strength and resistance to stretching in the direction of the fiber orientations. Ligaments and tendons are made of dense regular...
12.3K
01:27Muscles of the Vertebral Column
3.3K
The back muscles that lie deep into the thoracolumbar fascia are called intrinsic or true back muscles. These muscles are divided into four layers: superficial, intermediate, deep, and deepest layers.
Superficial Layer:
The superficial layer consists primarily of the splenius muscles, which include the splenius capitis and splenius cervicis. These muscles are mainly responsible for the head and cervical spine movements, including extension, rotation, and lateral bending. The splenius capitis...
Superficial Layer:
The superficial layer consists primarily of the splenius muscles, which include the splenius capitis and splenius cervicis. These muscles are mainly responsible for the head and cervical spine movements, including extension, rotation, and lateral bending. The splenius capitis...
3.3K
01:29Types Of Column Chromatography
13.9K
The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
Gel Filtration Chromatography
When the...
Gel Filtration Chromatography
When the...
13.9K
01:13Principles Of Column Chromatography
9.0K
The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
9.0K
01:28Articulations of the Vertebral Column
3.2K
In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...
3.2K