scholarly journals Precision control of flow rate in microfluidic channels using photoresponsive soft polymer actuators

Lab on a Chip ◽  
2017 ◽  
Vol 17 (11) ◽  
pp. 2013-2021 ◽  
Author(s):  
Colm Delaney ◽  
Peter McCluskey ◽  
Simon Coleman ◽  
Jeffrey Whyte ◽  
Nigel Kent ◽  
...  
Keyword(s):  
Flow Rate ◽  
Microfluidic Channels ◽  
Precision Control ◽  
Polymer Actuators ◽  
Pid Algorithm ◽  
Control Of Flow ◽  
Soft Polymer

Precision control of flow using photoresponsive hydrogels within fluidic channels was demonstrated by applying a PID algorithm.

Electromechanical characterization of magnetic responsive and conductive soft polymer actuators

2020 ◽  
pp. 349-361 ◽  
Author(s):  
A.W. Gan ◽  
Kirthika Senthil Kumar ◽  
Lei Zhang ◽  
Jianyong Ouyang ◽  
Hongliang Ren
Keyword(s):  
Polymer Actuators ◽  
Soft Polymer ◽  
Electromechanical Characterization

Application of PLC-Based Automatic Control System in a Pilot-Scale Anoxic/Anaerobic/Aerobic/Pre-Anoxic -MBR Plant

2012 ◽  
Vol 524-527 ◽  
pp. 2092-2096
Author(s):  
Xiang Hu ◽  
Li Xie ◽  
Bo Chen ◽  
Ho Jae Shim ◽  
Qi Zhou
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Flow Rate ◽  
Pilot Scale ◽  
Efficient Operation ◽  
Pid Algorithm ◽  
Nutrient Removal Efficiency ◽  
Intelligent Pid ◽  
Do Concentration

In this paper, in order to ensure stable and efficient operation of a pilot-scale modified A2/O (anoxic/anaerobic/aerobic/pre-anoxic) -MBR plant, the automatic control system based on PLC is designed and introduced from the views of system configuration and unit control methods. The master computer undertakes the monitoring and managing task by Siemens WINCC 7.0 configuring software, while the slave computer implements the function of data collection and automatic control based on Siemens S7-300 PLC. Intelligent PID algorithm is utilized to precisely control the influent flow rate, recycled flow rate and DO concentration in aerobic tank in this system. The commissioning and operation practice has proved that the PLC-based automatic control system greatly improved the degree of automation and achieved high nutrient removal efficiency in this plant.

scholarly journals Strategies to Control Performance of 3D-Printed, Cable-Driven Soft Polymer Actuators: From Simple Architectures to Gripper Prototype

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 846 ◽  
Author(s):  
Viacheslav Slesarenko ◽  
Seiji Engelkemier ◽  
Pavel Galich ◽  
Dmitry Vladimirsky ◽  
Gregory Klein ◽  
...  
Keyword(s):  
Mechanical Response ◽  
Weight Lifting ◽  
Polymer Actuators ◽  
Cable Channel ◽  
Polymer Actuator ◽  
3D Printed ◽  
Soft Polymer ◽  
Soft Actuators ◽  
Design And Manufacture ◽  
Selection Of

The following is a study of the performance of soft cable-driven polymer actuators produced by multimaterial 3D printing. We demonstrate that the mechanical response of the polymer actuator with an embedded cable can be flexibly tuned through the targeted selection of actuator architecture. Various strategies, such as the addition of discrete or periodic stiff inserts, the sectioning of the actuator, or the shifting of the cable channel are employed to demonstrate ways to achieve more controllable deformed shape during weight lifting or reduce the required actuation force. To illustrate these concepts, we design and manufacture a prototype of the soft polymer gripper, which is capable of manipulating small, delicate objects. The explored strategies can be utilized in other types of soft actuators, employing, for instance, actuation by means of electroactive polymers.

Fundamentals of elasto-inertial particle focusing in curved microfluidic channels

Lab on a Chip ◽  
2016 ◽  
Vol 16 (14) ◽  
pp. 2626-2635 ◽  
Author(s):  
Nan Xiang ◽  
Xinjie Zhang ◽  
Qing Dai ◽  
Jie Cheng ◽  
Ke Chen ◽  
...  
Keyword(s):  
Flow Rate ◽  
Process Model ◽  
Microfluidic Channels ◽  
Inertial Particle ◽  
Particle Focusing ◽  
Stage Process

We experimentally explore the elasto-inertial particle focusing in curved microfluidic channels and propose a six-stage process model illustrating the particle focusing with increasing flow rate.

scholarly journals Doppler-Based Flow Rate Sensing in Microfluidic Channels

Sensors ◽  
2014 ◽  
Vol 14 (9) ◽  
pp. 16799-16807 ◽  
Author(s):  
Liron Stern ◽  
Avraham Bakal ◽  
Mor Tzur ◽  
Maya Veinguer ◽  
Noa Mazurski ◽  
...  
Keyword(s):  
Flow Rate ◽  
Microfluidic Channels

scholarly journals On-chip pressure measurements and channel deformation after oil absorption

2020 ◽  
Vol 2 (9) ◽  
Author(s):  
Liam Hunter ◽  
Julia Gala de Pablo ◽  
Ashley C. Stammers ◽  
Neil H. Thomson ◽  
Stephen D. Evans ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Flow Rate ◽  
Young's Modulus ◽  
Pressure Profile ◽  
Mineral Oil ◽  
Microfluidic Channels ◽  
Oil Absorption ◽  
Channel Deformation ◽  
Before And After ◽  
On Chip

Abstract Microfluidic channels moulded from the soft polymer poly(dimethylsiloxane) (PDMS) are widely used as a platform for mimicking biological environments, and can be used for the simulation of fluid filled structures such as blood and lung vessels. The control of pressure and flow rate within these structures is vital to mimic physiological conditions. The flexibility of PDMS leads to pressure-induced deformation under flow, leading to variable flow profiles along a device. Here, we investigate the change in Young’s modulus of microfluidic channels due to infiltration of mineral oil, a PDMS permeable fluid, and how this affects the resulting pressure profile using a novel pressure measurement method. We found a 53% decrease in Young’s modulus of PDMS due to mineral oil absorption over the course of 3 h accounted for lower internal pressure and larger channel deformation compared to fresh PDMS at a given flow rate. Confocal fluorescence microscopy used to image channel profiles before and after the introduction of mineral oil showed a change in pressure-induced deformation after infiltration of the oil. Atomic force microscopy (AFM) nanoindentation was used to measure Young’s modulus of PDMS before ($$2.80 \pm 0.03$$ 2.80 ± 0.03 MPa) and after ($$1.32 \pm 0.04$$ 1.32 ± 0.04 MPa) mineral oil absorption. Raman spectroscopy showed the infiltration of mineral oil into PDMS from channel walls and revealed the diffusion coefficient of mineral oil in PDMS.

Untethered MicroRobot Motion Mechanism with Increased Longitudinal Force

2021 ◽  
pp. 1-12
Author(s):  
Ali Anil Demircali ◽  
Rahmetullah Varol ◽  
Kadir Erkan ◽  
Huseyin Uvet
Keyword(s):  
Flow Rate ◽  
Permanent Magnets ◽  
Pyrolytic Graphite ◽  
Longitudinal Force ◽  
High Flow ◽  
Experimental Results ◽  
Microfluidic Channels ◽  
Simulation Studies ◽  
Field Lines

Abstract The importance of an untethered microrobotic platform that can operate on high flow rate microfluidic channels for in-vitro applications is increasing rapidly. This paper presents a method to manipulate a microrobot in a fluidic chip when high flow rates (4 mL/min, 82.304 mm/s) are applied. This method is based on a novel permanent magnet-based diamagnetic levitation configuration. This configuration includes a thin layer of pyrolytic graphite, which is placed just below the microrobot. In this way, microrobot stability and manipulation capability are increased. Also, we aim to increase the longitudinal forces imposed on the microrobot to withstand the drag force proportional to the flow rate. Hence, magnetic field lines are generated more linearly around the microrobot by a different combination of permanent magnets. The proposed magnetic configuration, named “Kerkan configuration,” significantly improves the microrobot's longitudinal forces. In this configuration, two different ring-shaped ferromagnetic magnets are used. One of the magnets has a smaller diameter than the other magnet. A combination of one smaller and one bigger magnet is placed above and below the microrobot. In order to validate the advantages of this configuration, analytical and simulation studies are conducted. Their results are then compared with experimental results. Experimental results are on par with analytical and simulation studies. Kerkan configuration has a lower displacement than the next best configuration at the highest flow rate we applied (relatively 3301 µm, %21.8).

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