On a mechanical oscillator, a glass stage featuring a metal sphere on a tee was supported by three cylindrical pillars of magnetically structured hydrogel containing cofacially oriented TiNSs (0.8 wt%) in parallel (g) or orthogonal (h) direction to the cylinder cross-section.
In a world-first achievement, scientists from the RIKEN Center for Emergent Matter Science in Japan, along with colleagues from the National Institute of Material Science and the University of Tokyo, have developed a new hydrogel whose properties are dominated by electrostatic repulsion, rather than attractive interactions.
According to Yasuhiro Ishida, head of the Emergent Bioinspired Soft Matter Research Team, the work began from a surreptitious discovery, that when titanate nano-sheets are suspended in an aqueous colloidal dispersion, they align themselves face-to-face in a plane when subjected to a strong magnetic field. The field maximizes the electrostatic repulsion between them and entices them into a quasi-crystalline structure. They naturally orient themselves face to face, separated by the electrostatic forces between them.
To create the new material, the researchers used the newly discovered method to arrange layers of the sheets in a plane, and once the sheets were aligned in the plane, fixed the magnetically induced structural order by transforming the dispersion into a hydrogel using a procedure called light-triggered in-situ vinyl polymerization. Essentially, pulses of light are used to congeal the aqueous solution into a hydrogel, so that the sheets could no longer move.
By doing this, they created a material whose properties are dominated by electrostatic repulsion, the same force that makes our hair stand end when we touch a van generator.
Up to now, manmade materials have not taken advantage of this phenomenon, but nature has. Cartilage owes its ability to allow virtually frictionless mechanical motion within joints, even under high compression, to the electrostatic forces inside it. Electrostatic repulsive forces are used in various places, such as maglev trains, vehicle suspensions and noncontact bearings, but up to now, materials design has focused overwhelmingly on attractive interactions.
Read more: A repulsive material
The Latest on: Repulsive hydrogel
via Google News
The Latest on: Repulsive hydrogel
- Skin Patch Provides Medication That Stickson February 8, 2021 at 4:00 pm
a non-invasive method of propelling a high concentration of a charged substance transdermally by repulsive electromotive force. A small electrical charge is applied to an iontrophoretic chamber ...
- Weapons, Armor, and Equipmenton February 5, 2021 at 5:44 am
Kinetic barriers are repulsive Mass Effect fields projected ... but weapons recoil is still the prime limiting factor on slug velocity. Medi-gel is a common medicinal salve used by paramedics ...
- Reproduction: Some sperm cells POISON each other in the race to be first to the eggon February 4, 2021 at 11:01 am
study finds Jealous male butterflies 'cover their female mates with repulsive smell to deter other males' Scientists develop 'trifunctional' contraceptive gel that boosts libido, prevents ...
- Anterior-Posterior Guidance of Commissural Axons by Wnt-Frizzled Signalingon February 2, 2021 at 4:00 pm
We observed that when a segment of E13 (embryonic day 13) rat spinal cord was cultured in collagen gel, commissural axons projected ventrally ... To address whether the A-P guidance cue is attractive ...
- Towards bio-inspired artificial muscle: a mechanism based on electro-osmotic flow simulated using dissipative particle dynamicson January 26, 2021 at 10:47 am
These parameters in this research are divided into four general categories: repulsive parameter or parameter ... actuator using poly vinyl chloride gel. In IEEE Conf., Bangkok, Thailand, 22 ...
- Nightmare Stories of Pest Infestations and How People Got Rid of Themon January 26, 2021 at 7:19 am
The gel made a huge difference ... That was the first time we saw those repulsive swollen creatures moving away from the bed. Even though we really liked that apartment, we reluctantly had ...
- Hagfishes: how much slime can a slime eel make?on October 21, 2020 at 4:02 am
While some might describe a hagfish as 'repulsive,' 'disgusting' or ... Its structure acts more like a fine sieve that slows water down rather than a coherent gel. Hagfish slime is much more dilute ...
- Why are people fascinated by horror? – 1969on December 8, 2019 at 12:47 am
"People come in and they'll see a particularly repulsive thing and say, 'I must have that'." How a West End costume shop turns austere City stockbrokers into boys again. This clip is from Nationwide.
- Materials Research Science and Engineering Centeron August 3, 2019 at 12:31 pm
Rafts in like states have repulsive interactions, while unlike states lead to metastably ... The investigators have now made a truly macroscopic (millimeter sized) 3D contractile active gel composed ...
- Watch This Hydrogel Strut Across A Tableon February 27, 2019 at 2:00 am
As the gel heats up, from 25°C (77°F) to 45°C (113°F), these parallel sheets become more repulsive and start to inch away from each other. This causes the gel to expand and prompts the front ...
via Bing News
