In Situ Electrochemical Digital Holographic Microscopy; a Study of Metal Electrodeposition in Deep Eutectic Solvents

2013 ◽  
Vol 85 (14) ◽  
pp. 6653-6660 ◽  
Author(s):  
Andrew P. Abbott ◽  
Muhammad Azam ◽  
Karl S. Ryder ◽  
Saima Saleem
Keyword(s):  
Deep Eutectic Solvents ◽  
Digital Holographic Microscopy ◽  
Metal Electrodeposition ◽  
Holographic Microscopy

scholarly journals Ionic Species Affect the Self-Propulsion of Urease-Powered Micromotors

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Xavier Arqué ◽  
Xavier Andrés ◽  
Rafael Mestre ◽  
Bernard Ciraulo ◽  
Jaime Ortega Arroyo ◽  
...  
Keyword(s):  
Biological Fluids ◽  
Ionic Species ◽  
The Self ◽  
Digital Holographic Microscopy ◽  
Future Application ◽  
Methoxypolyethylene Glycol ◽  
Negative Effect ◽  
The Media ◽  
Holographic Microscopy

Enzyme-powered motors self-propel through the catalysis of in situ bioavailable fuels, which makes them excellent candidates for biomedical applications. However, fundamental issues like their motion in biological fluids and the understanding of the propulsion mechanism are critical aspects to be tackled before a future application in biomedicine. Herein, we investigated the physicochemical effects of ionic species on the self-propulsion of urease-powered micromotors. Results showed that the presence of PBS, NaOH, NaCl, and HEPES reduced self-propulsion of urease-powered micromotors pointing towards ion-dependent mechanisms of motion. We studied the 3D motion of urease micromotors using digital holographic microscopy to rule out any motor-surface interaction as the cause of motion decay when salts are present in the media. In order to protect and minimize the negative effect of ionic species on micromotors’ performance, we coated the motors with methoxypolyethylene glycol amine (mPEG) showing higher speed compared to noncoated motors at intermediate ionic concentrations. These results provide new insights into the mechanism of urease-powered micromotors, study the effect of ionic media, and contribute with potential solutions to mitigate the reduction of mobility of enzyme-powered micromotors.

scholarly journals In situ nanoscale observations of gypsum dissolution by digital holographic microscopy

2017 ◽  
Vol 460 ◽  
pp. 25-36 ◽  
Author(s):  
Pan Feng ◽  
Alexander S. Brand ◽  
Lei Chen ◽  
Jeffrey W. Bullard
Keyword(s):  
Digital Holographic Microscopy ◽  
Gypsum Dissolution ◽  
Holographic Microscopy
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