Article
Physics, Applied
Binzhen Zhang, Yangyang Wang, Yunpeng Liu, Huan Li, Wenxuan Zang, Junping Duan
Summary: This paper proposes a novel focusing method using microfilters and interdigital electrodes to capture and separate particles. Experimental results show that the capture efficiency of the chip reaches 71%-86% and the separation efficiency is over 98.6%, making it potentially suitable for separating circulating tumor cells in blood samples.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Di Ni, Ronald Heisser, Benyamin Davaji, Landon Ivy, Robert Shepherd, Amit Lal
Summary: This study presents a three-dimensional polymer interdigitated pillar electrostatic actuator with high force densities and linear actuation capability. The actuator shows superior stability and durability in experiments.
MICROSYSTEMS & NANOENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Yongxin Song, Xiaoshi Han, Deyu Li, Qinxin Liu, Dongqing Li
Summary: A novel microfluidic method was proposed to count the number of particles while they are separated by localized DC-dielectrophoresis force. The separation and counting of particles of different sizes, including polystyrene particles, were successfully demonstrated with a resolution of 1 μm. This method allows for simultaneous separation and in situ counting of particles, showing potential for various applications in particle analysis.
Article
Engineering, Electrical & Electronic
Hideo Miyamukai, Ippei Yagi, Satoshi Uchida, Masayo Takano, Yoshikazu Wakizaka, Takaharu Enjoji
Summary: This study successfully isolated leukemia cells and fluorescent polystyrene particles using 3D microcylindrical electrodes, indicating that the proposed device may be able to separate cells of similar size with high accuracy.
ELECTRONICS AND COMMUNICATIONS IN JAPAN
(2021)
Article
Nanoscience & Nanotechnology
Roozbeh Abedini-Nassab, Jake Wirfel, Bahram Talebjedi, Nishat Tasnim, Mina Hoorfar
Summary: In this study, we investigate the dielectrophoretic force on spherical colloidal particles exposed to an interdigitated electrode array in a microfluidic environment using theory, simulation, and experiment. Our findings demonstrate that theoretical predictions align with experimental results, and a frequency-response function for negative-dielectrophoresis instruments is derived using an equivalent electrical circuit model. Additionally, the analysis reveals that electrode width and array spacing play a crucial role in the magnitude and distance dependence of the negative dielectrophoresis force.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Chemistry, Analytical
Xiaoming Chen, Shun Liu, Xu-guang Hu, Tengteng Liu, Mo Shen, Yun Peng, Sheng Hu, Yong Zhao
Summary: Manipulation of micro- and nanoscale objects using induced-charge electro-osmotic (ICEO) vortices is a promising approach for detection and sensing applications. However, the current throughput of this method is limited. To overcome this constraint, a novel method using parallel ICEO vortices is proposed, which allows for higher throughput without compromising efficiency. This method can be applied in disease diagnosis and environmental monitoring by integrating with simple and economical sensors.
ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
Wardan A. Khatib, Arslan Ayari, Ahmed T. Yasir, Mohammed Talhami, Probir Das, M. A. Quadir, Alaa H. Hawari
Summary: The study demonstrated that the novel electrode array showed good performance in harvesting marine microalgae through dielectrophoretic force. Short electrolysis time and appropriate electrode distance significantly improved the harvesting efficiency and energy efficiency of microalgae.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Biochemical Research Methods
Arash Dalili, Mina Hoorfar
Summary: This study compares sheath-assisted and sheathless DEP separation of three sizes of microparticles using tilted electrodes. The results show that the sheath-assisted design has higher separation efficiency, while the sheathless design offers higher sample throughput.
Article
Engineering, Aerospace
Robert E. Weber, Janusz J. Petkowski, Monika U. Weber
Summary: Based on evidence of chemical disequilibria and other anomalous observations, it is motivated that there may be life within the Venusian atmosphere. The Fluid-Screen technology, which utilizes dielectrophoretic microbial particle capture, concentration, and separation, is capable of capturing and separating various biological particles. This article discusses the potential implementation of Fluid-Screen in the context of the Venus Life Finder missions and highlights its unique scientific output.
Article
Engineering, Chemical
Reza Derakhshan, Amirhosein Ghasemi, Reza Moradi, Abas Ramiar
Summary: This paper presents a comprehensive numerical investigation on particle/cell separation in circular microchannels using dielectrophoresis (DEP). The results show that the direction of particle deflection can be controlled by varying the geometrical parameters. By applying DEP, efficient separation of particles and cells based on their size and physical properties is achieved.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Arash Dalili, Hossein Montazerian, Kabilan Sakthivel, Nishat Tasnim, Mina Hoorfar
Summary: This study investigated the factors affecting the displacement of particles in electrophoresis-based microseparators, finding that volumetric throughput has the greatest impact on particle position, with channel length being the most effective factor. The study also successfully demonstrated size-selective sorting or focusing of particles, providing valuable insights into designing microfluidic platforms for selectively separating different cell types in biofluids.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Physics, Multidisciplinary
Bing Yan, Bo Chen, Yongliang Xiong, Zerui Peng
Summary: This study developed a device to achieve continuous particle separation using a direct current electric field and analyzed the influence of the Joule heating effect on particle separation. The results showed that the Joule heating effect can lead to non-uniform temperature distribution in the channel, and increasing channel flux and temperature enhances the Joule heating effect. Additionally, the ability of vortices to trap particles is strengthened by the Joule heating effect, leading to improved separation efficiency.
Article
Chemistry, Analytical
Marius Andrei Olariu, Tudor Alexandru Filip, Catalina Anisoara Peptu, Ina Turcan
Summary: This paper reports the functionality of dielectrophoresis (DEP) for manipulating multi-walled carbon nanotubes (MWCNTs) on printed interdigitated electrodes. The success of DEP manipulation and suitable signal frequencies for avoiding parasitic effects were demonstrated. The time-dependent effect and voltage contribution in MWCNTs bridge formation were discussed.
Article
Engineering, Chemical
Tae Joon Kwak, Huihun Jung, Benjamin D. Allen, Melik C. Demirel, Woo-Jin Chang
Summary: This study introduced a dielectrophoretic separation technique to selectively isolate spherical protein particles from a mixture of randomly shaped particles, aiming to enhance the design and production of drug delivery materials.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biochemical Research Methods
Reza Derakhshan, Ali Bozorgzadeh, Abas Ramiar
Summary: In recent years, microfluidic-based particle/cell manipulation techniques, especially dielectrophoresis (DEP), have brought significant advances in various scientific fields. This study presents the design and investigation of a sheathless 3D microchannel with a wall-mounted trapezoidal obstacle for continuous-flow separation of polystyrene particles using DEP. A simulation code is developed and validated with experimental tests. The numerical investigation reveals that obstacle height, applied voltage, electrode pairs angle, and flow rate significantly affect efficient particle separation. The proposed design shows promise for integration with lab-on-a-chip and clinical diagnosis applications due to its advantages.
JOURNAL OF CHROMATOGRAPHY A
(2023)
Article
Engineering, Electrical & Electronic
M. Sadeghi, Y. Hojjat, M. Khodaei
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2019)
Article
Materials Science, Multidisciplinary
H. Vatanjou, Y. Hojjat, M. Karafi
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Engineering, Electrical & Electronic
M. Sadeghi, Y. Hojjat, M. Khodaei
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Engineering, Chemical
Masoumeh Mofarrah, Yousef Hojjat, Shahriar Mashayekh, Zhen Liu, Keping Yan
Summary: This study proposes a new electro cyclone for collecting pollen from indoor environments and demonstrates an increase in separation efficiency. The results indicate that high electrostatic voltage enhances the efficiency of the electro cyclone, particularly on finer particles.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Automation & Control Systems
Mohammad Afrasiab, Yousef Hojjat, Ghader FarajinAff, Hassan Moslemi Naeini
Summary: The study focused on investigating the effect of high strain rates on the formability of ultrafine-grained sheets produced by the ARB process. It was found that while the hardness and mechanical strength of the ARBed sheets increased significantly after multiple passes, their formability decreased notably. However, after high strain rate processing, the formability of the sheets improved by 102% to 113% compared to the quasi-static condition.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Mechanics
Shahryar Ghorbanirezaei, Yousef Hojjat, Saeed Dehdari, Mohammad Reza Karafi
Summary: In this study, an innovative pneumatic positioning actuator is developed and tested. Two novel mechanisms are proposed to generate controlled air impulses for the actuator. The actuator moves due to the recoil of an internally shot bullet and achieves repeatable displacements of 10 nm. The accuracy depends on the air impact magnitude and fabrication specifications.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Multidisciplinary Sciences
Mohammad Shirkosh, Yousef Hojjat, Mohammad Mahdi Mardanpour
Summary: This paper investigates the optimization of microfluidic microbial fuel cells (MFCs), focusing on the influence of different electron transfer mechanisms, metal-based electrodes, and a static magnetic field. The results show that the use of zinc anode significantly improves the current density. Microfluidic MFCs can serve as micro-sized power generators for medical applications.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Mechanical
Mahsa Sadat Rashidi Zavie, Yousef Hojjat, Mohammad Shirkosh, Behzad Ghavami Namin
Summary: This paper presents a novel passive control levitation system that combines electrostatic attraction and compressed-air repulsion forces. The system allows for adjusting the levitation gap and indirectly measuring the electrostatic force.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Alireza Ghaffari, Yousef Hojjat
Summary: The aim of this study is to develop a soft pneumatic rotary encoder (SPRE) using soft pneumatic sensing chambers (SPSCs) and air pressure sensors to convert volumetric changes into rotary displacements. The advantages of implementing soft measurement methods are achieved, such as electrical isolation and compatibility with body-interacting mechanisms. The SPSC-governing mechanical model was developed using experimental tests and Abaqus finite-element software, and an SPRE was built based on the optimized geometrical parameters. The encoder showed a maximum absolute measurement error of 3.34 degrees, resolution of 0.062 degrees, and repeatability of 1.09 degrees.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Alireza Khouzestani, Yousef Hojjat, Marziyeh Tavalaee, Hesam Sadeghian, Mohammad Hossein Nasr-Esfahani
Summary: A novel method for more accurately measuring the DEP force is presented, which takes into account the friction effect neglected in previous studies. The release force of cells caused by fluid flow was measured in different alignments of the microchannel with the electrodes to calculate the net DEP force. Experimental results showed that the DEP forces applied to WBC and human sperm were 42 pN and 3 pN, respectively.
Article
Multidisciplinary Sciences
Ava Pirayande, Yousef Hojjat
Summary: This article introduces a new piezoelectric frequency converter (PFC) that uses two piezoelectric discs for frequency conversion. By applying different input frequencies, different output frequencies can be obtained. However, the input and output frequencies are limited to the piezoelectric element's out-of-plane and radial modes.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Seyed Hassan Jahantab, Yousef Hojjat, Behzad Ghavami Namin, Mohammad Shirkosh
Summary: The present study introduces a multi-degree-of-freedom (MDOF) ultrasonic motor, which is capable of driving a spherical rotor using spiral wire stators and a piezoelectric stack actuator. The proposed motor is smaller and simpler, lower in power consumption, and has different modes at different frequencies due to the wire stators and piezoelectric stack actuators. Through finite element method (FEM) analysis, it has been demonstrated that the piezoelectric stack actuator can provide MDOF motions. Experimental investigations on rotational speed, torque, and preload force were conducted, and a new torque calculation method and preload force measurement method were developed.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Manufacturing
Yousef Hojjat, Mohammad Shirkosh
Summary: The mechanism introduced in this paper is a novel linear movement mechanism, utilizing the movement of a roller on a rotating flat shaft. The lead can be continuously adjusted, allowing for fast positioning over a wide range with high accuracy.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2021)
Article
Engineering, Civil
Mohammad H. Jafarkarimi, Shahryar Ghorbanirezaei, Yousef Hojjat, Vahid Sabermand
SMART STRUCTURES AND SYSTEMS
(2020)
Article
Engineering, Civil
Shahryar Ghorbanirezaei, Yousef Hojjat, Mojtaba Ghodsi
SMART STRUCTURES AND SYSTEMS
(2019)