Here we show that rolled-up and electroplated catalytic microjet engines undergo dramatic corrosion in fuel solution.
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http://dx.doi.org/10.1039/c3cc44998j | DOI Listing |
Small
August 2023
College of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, P. R. China.
Solar-powered interfacial heating has emerged as a sustainable technology for hybrid applications with minimal carbon footprints. Aerogels, hydrogels, and sponges/foams are the main building blocks for state-of-the-art photothermal materials. However, these conventional three-dimensional (3D) structures and related fabrication technologies intrinsically fail to maximize important performance-enhancing strategies and this technology still faces several performance roadblocks.
View Article and Find Full Text PDFMaterials (Basel)
October 2021
Machining Research Laboratory, Ontario Tech University, Oshawa, ON L1G 0C5, Canada.
It is necessary to improve the machinability of difficult-to-cut materials such as hardened steel, nickel-based alloys, and titanium alloys as these materials offer superior properties such as chemical stability, corrosion resistance, and high strength to weight ratio, making them indispensable for many applications. Machining with self-propelled rotary tools (SPRT) is considered one of the promising techniques used to provide proper tool life even under dry conditions. In this work, an attempt has been performed to analyze, model, and optimize the machining process of AISI 4140 hardened steel using self-propelled rotary tools.
View Article and Find Full Text PDFPhys Rev E
April 2021
Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA.
We predict the emergence of large-scale polar order and spontaneous directional flows in a class of self-propelled autonomous particles that interact via passive repulsion between off-center sites. The coupling of active motion with the passive torque acting about the particle centers results in hybrid active-passive interactions responsible for a macroscopic phase transition from an isotropic state to a polar-aligned state in systems of particles with front interaction sites. We employ a continuum kinetic theory to explain that the emergence of long-ranged orientational order, which occurs in unbounded domains at finite densities, can be externally activated independently of the self-propulsion mechanism and drives a macroscopic particle flow in a direction selected by symmetry breaking.
View Article and Find Full Text PDFNanoscale
January 2018
Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
Autonomous self-propelled nano and microrobots are in the forefront of materials research. The micromachines are typically prepared in batches, stored and subsequently used. We show here that the storage of platinum tubular catalytic microrobots in water causes their corrosion which results in their lower mobility and performance.
View Article and Find Full Text PDFChem Commun (Camb)
October 2013
Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Here we show that rolled-up and electroplated catalytic microjet engines undergo dramatic corrosion in fuel solution.
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