Engineers build chemically driven wheels that ‘morph’ into gear to do mechanical work


2 O <उप> 2 Indicates the spatial distribution of y = 3 mm in solution for side views and z = 0.4 mm for top views. The introduction of D-glucose into the solution activates the Gox-coated rotor, which transforms into a 3D structure and spins spontaneously. The cat-coated rotor remains flat and stable. H <उप> 2 O <उप> 2 The cascade arises from the first reaction, constituting the first phase of the reaction. H <उप> 2 O <उप> 2 In the presence of, the cat-coated rotor is activated and starts to rotate, while the GOX-coated rotor becomes flat and stabilizes as glucose in solution. Over time, the solution contains H. <उप> 2 O <उप> 2 Also terminates and, as a result, the Cat-coated rotor speeds off and the sheet falls flat. Sincerely: a. Lascar “width =” 600 “height =” 480″/>

Animation from simulation demonstrating the ratio-temporal control of rotors through a cascade reaction. The GOx-coated rotor (magenta) is located on the left side of the chamber, while the cat-coated rotor (green) is located on the right. The background color map indicates the spatial distribution of H2Hey2 In a solution of y = 3 mm for the side view and z = 0.4 mm for the top view. The introduction of D-glucose into the solution activates the Gox-coated rotor, which transforms into a 3D structure and spins spontaneously. The cat-coated rotor remains flat and stable. H2Hey2 The cascade is formed by the first reaction, constituting the first phase of the reaction. In the presence of H.2Hey2, The cat-coated rotor becomes active and begins to rotate, while the GOX-coated rotor becomes flat and stable as glucose is reduced in solution. Over time, h2Hey2 The solution is also reduced and, as a result, the cat-coated rotor speed stops and the sheet falls flat. Sincerely: a. Lasker

The gear is one of the oldest mechanical devices in human history and led to machines ranging from modern irrigation systems and clocks to modern engines and robotics. For the first time, researchers at the University of Pittsburgh Swanson School of Engineering have used a catalytic reaction to “morph” a two-dimensional, chemically coated sheet into a three-dimensional gear that works continuously.

The findings indicate the ability to develop chemically powered machines that do not rely on external power, but only require the addition of reactants to the surrounding solution. Published today in SAIL Press Journal matterAna c the research. Balazs, Distinguished Professor of Chemical and Petroleum Engineering and John A. Was developed by the Swanson Chair of Engineering. Lead writer Abrajeet Laskar and co-author Oleg E. There is Shakaliyav, who is both a doctoral associate.

Balazs explains, “Gears help give mechanical life to machines; however, they require some kind of external power to perform a task, such as steam or electricity. It operates in resource-poor or remote environments Vali limits the capacity of future machines, ”explains Balazs. “Abrajit’s computational modeling has shown that chemo-mechanical translocation (converting chemical energy into motion) on an active sheet presents a new way to replicate the behavior of gears in environments without access to conventional power sources.”

पिट इंजीनियर्स रासायनिक रूप से चालित पहियों का निर्माण करते हैं जो यांत्रिक कार्य करने के लिए 2 O <उप> 2 Demonstration of mobility of a CAT-coated flexible sheet in solution. The cat is stabilized on the sheet and the H solution in the host solution of light products (water and oxygen) <उप> 2 O <उप> 2 , Causing smooth fluid flow. These fluids flow to the bottom of the fluid domain, creating an ideal 3D structure to pop up the 2D flexible sheet in the center (lighter than the pop nodes) (see side view), which captures the flow And rotates in a clockwise direction. Sincerely: a. Lasker”/>

Animation from a simulation demonstrating the dynamics of a cat-coated flexible sheet in H2Hey2 Solution. The cat settles on the sheet and decomposes H.2Hey2 In host solutions of light products (water and oxygen), which cause smooth fluid flow. These fluids flow to the bottom of the fluid domain, creating an ideal 3D structure to pop up the 2D flexible sheet in the center (lighter than the pop nodes) (see side view), which captures the flow And rotates in a clockwise direction. Sincerely: a. Lasker

In the simulation, the catalyst is placed at various points on a two-dimensional sheet, which is like a wheel with spokes, with heavy nodes on the circumference of the sheet. The flexible sheet, which is approximately one millimeter in length, is then placed in a fluid-filled microbeactor. A reactive chamber is added that activates the catalyst on the flat “wheel”, allowing the fluid to flow spontaneously. The flow of incoming fluid drives the lighter sections of the sheet to pop up, creating an active rotor that captures and rotates the flow.

“What’s really specific about this research is the coupling of deformation and propulsion to modify the shape of the object to create movement,” Lasker says. “The deformation of the object is the main one; we see in nature that organisms use chemical energy to change their shape and speed. To move our chemical sheet, it has to spontaneously change to a new shape, which makes it Allows fluid to hold the flow. And its function. “

Additionally, Laskar and Shakliav found that not all gear parts are required for the motion to be chemically active; In fact, asymmetry is important for creating movement. By determining the design rules for placement, Lasker and Shakliav can direct the rotation to be clockwise or counterclockwise. This additional “program” enabled the control of independent rotors, with active or passive gear systems, to move independently or in a cascade effect. This more complex action is controlled by the internal structure of the spokes, and the placement within the fluid domain.

Pitt engineers manufacture chemically driven wheels to perform mechanical work

Transmission of rotational speed from one active gear to two passive gears. In a fluid chamber, an active gear can rotate several passive gears, which are placed to break the symmetry of the flow field. Sincerely: a. Lasker

“Because a gear is a central component to any machine, you need to start from the basics, and what Abrajit has built is like an internal combustion engine on the millimeter scale,” says Shakilav. “While it will not power your car, it presents the ability to build basic mechanisms to run small-scale chemical machines and soft robots.”

In the future, Balazs will examine how spatial organization relative to multiple gears may lead to greater functionality and potentially to design a system as if it were making a decision.

“The more remote the machine is from a human control, the more you need the machine to provide control to accomplish a given task,” Balazs said. “The chemo-mechanical nature of our equipment allows it to occur without any external power source.”

These self-morphing gears are the latest development of chemo-mechanical processes developed by Balasz, Laskar and Shakilv. Other advances include making crab-like sheets that mimic feed, flight, and fight responses; And the sheets resemble “flying carpets” that wrap, flap and creep.


Chemical engineered catalysts replicate feed, fight, and flight reactions in chemical reactions


more information:
matter (2020). DOI: 10.1016 / j.matt.2020.11.04, www.cell.com/matter/fulltext/S2590-2385(20)30631-7

Provided by the University of Pittsburgh

Quotes: Engineers build chemically driven wheels that ‘morph’ into gear to perform mechanical work (2020, 18 December) on 19 December 2020 https://phys.org/news/2020-12-chemically-driven- reclaim from wheels-mhph-gears. .html

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