A droplet-based pH regulator in microfluidics

Lab on a Chip ◽  
2014 ◽  
Vol 14 (11) ◽  
pp. 1917-1922 ◽  
Author(s):  
Hongbo Zhou ◽  
Gang Li ◽  
Shuhuai Yao
Keyword(s):  
Droplet Formation ◽  
On Demand ◽  
Demand Control

A stable microenvironment with pH ranging from 3 to 11 is achieved by on-demand control of droplet formation and electrolysis.

On-Demand Control System for Deep Brain Stimulation for Treatment of Intention Tremor

2012 ◽  
Vol 16 (3) ◽  
pp. 230-235 ◽  
Author(s):  
Takamitsu Yamamoto ◽  
Yoichi Katayama ◽  
Junichi Ushiba ◽  
Hiroko Yoshino ◽  
Toshiki Obuchi ◽  
...  
Keyword(s):  
Control System ◽  
Deep Brain Stimulation ◽  
Brain Stimulation ◽  
Intention Tremor ◽  
On Demand ◽  
Demand Control ◽  
Deep Brain

scholarly journals Who May Benefit From On-Demand Control of Deep Brain Stimulation? Noninvasive Evaluation of Parkinson Patients

2018 ◽  
Vol 21 (6) ◽  
pp. 611-616 ◽  
Author(s):  
Daniel Graupe ◽  
Nivedita Khobragade ◽  
Daniela Tuninetti ◽  
Ishita Basu ◽  
Konstantin V. Slavin ◽  
...  
Keyword(s):  
Deep Brain Stimulation ◽  
Brain Stimulation ◽  
Noninvasive Evaluation ◽  
On Demand ◽  
Demand Control ◽  
Deep Brain

The on-demand engineering of metal-doped porous carbon nanofibers as efficient bifunctional oxygen catalysts for high-performance flexible Zn–air batteries

2020 ◽  
Vol 8 (15) ◽  
pp. 7297-7308 ◽  
Author(s):  
Khang Ngoc Dinh ◽  
Zengxia Pei ◽  
Ziwen Yuan ◽  
Van Chinh Hoang ◽  
Li Wei ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
High Performance ◽  
Carbon Nanofiber ◽  
Porous Structures ◽  
On Demand ◽  
Dual Functional ◽  
Mechanical Deformations ◽  
Metal Doped ◽  
Demand Control ◽  
Zinc Air Batteries

A dual-functional metal template achieves on-demand control of metal–N–C sites, porous structures, and surface wettability in a carbon nanofiber catalyst, enabling flexible zinc–air batteries with outstanding performance under various mechanical deformations.

scholarly journals On-Demand Control of Living Cell Adhesion by Local Light Irradiation

2007 ◽  
Vol 35 (7) ◽  
pp. 436-440
Author(s):  
Kimio SUMARU ◽  
Toshiyuki KANAMORI
Keyword(s):  
Cell Adhesion ◽  
Living Cell ◽  
Light Irradiation ◽  
On Demand ◽  
Demand Control

scholarly journals On-demand Ferrofluid Droplet Formation With Non-linear Magnetic Permeability in the Presence of a Non-uniform Magnetic Field

2021 ◽  
Author(s):  
Mohamad Ali Bijarchi ◽  
Mohammad Yaghoobi ◽  
Amirhossein Favakeh ◽  
Mohammad Behshad Shafii
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Uniform Magnetic Field ◽  
Maxwell Equations ◽  
Droplet Diameter ◽  
Droplet Formation ◽  
Bond Number ◽  
On Demand ◽  
Drop On Demand ◽  
The Magnetic Field

Abstract The magnetic actuation of ferrofluid droplets offers an inspiring tool in widespread engineering and biological applications. In this study, the dynamics of ferrofluid droplet generation with a Drop-on-Demand feature under a non-uniform magnetic field is investigated by multiscale numerical modeling. Langevin equation is assumed for ferrofluid magnetic susceptibility due to the strong applied magnetic field. Large and small computational domains are considered. In the larger domain, the magnetic field is obtained by solving Maxwell equations. In the smaller domain, a coupling of continuity, Navier Stokes, two-phase flow, and Maxwell equations are solved by utilizing the magnetic field achieved by the larger domain for the boundary condition. The Finite volume method and coupling of level-set and Volume of Fluid methods are used for solving equations. The droplet formation is simulated in a two-dimensional axisymmetric domain. The method of solving fluid and magnetic equations is validated using a benchmark. Then, ferrofluid droplet formation is investigated experimentally and the numerical results are in good agreement with the experimental data. The effect of 12 dimensionless parameters including the ratio of magnetic, gravitational, and surface tension forces, the ratio of the nozzle and magnetic coil dimensions, and ferrofluid to continuous-phase properties ratios are studied. The results showed that by increasing the magnetic Bond number, gravitational Bond number, Ohnesorge number, dimensionless saturation magnetization, initial magnetic susceptibility of ferrofluid, the generated droplet diameter reduces, whereas the formation frequency increases. The same results were observed when decreasing the ferrite core diameter to outer nozzle diameter, density, and viscosity ratios.

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