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Chemical Reaction Engineering: Difusão com Biotransformação

D. R. M. Vieira [1], S. A. Cardoso [1], A. S. Santos [1],
[1] Universidade Federal do Pará, Pará, Brasil

A biotransformação de substratos utilizando enzimas imobilizadas em nanopartículas presentes num meio fluido (substrato), contido num bioreator CSTR, foi investigada. O software COMSOL Multiphysics foi usado para simular o sistema através do uso das equações de difusão de espécies apropriadas para o consumo do substrato. Nessa investigação, a difusão na superfície da nanopartícula, onde ocorre a ...

A Modular Platform for Cell Characterization, Handling, and Sorting by Dielectrophoresis

S. Burgarella[1], B. Dell’Anna[2], V. Perna[1], G. Zarola[2], and S. Merlo[2]

[1]STMicroelectronics, Agrate Brianza, MI, Italy
[2]Dipartimento di Elettronica, Università degli Studi di Pavia, Pavia, Italy

Dielectrophoresis (DEP) is a method for cell manipulation without physical contact in lab-on-chip devices, since it exploits the dielectric properties of cells suspended in a microfluidic sample, under the action of locally generated high-gradient electric fields. The DEP platform that has been developed offers an integrated solution for customizable applications. Several functional units, ...

Computational Simulation of Electrohydrodynamic Systems Pertaining to Micro and Nano scale Fluid Flow Phenomenon

M. Seiler[1], and B. Kirby[2]
[1]Department of Engineering Physics, Cornell
University, NY, USA
[2]Department of Mechanical Engineering, Cornell
University, NY, USA

Modeling of 3D AC electro-osmotic pumps is relevant to the creation of portable or implantable lab-on-a-chip devices for mm/s tunable fluid flows attainable with battery scale voltages. In this analysis using COMSOL Multiphysics we investigate the modeling challenges of computationally calculating systems of fluid flow phenomena governed by AC Electroosmosis in the micro and nano scale regimes.

Variable Capacitance And Pull-In Voltage Analysis Of Electrically Actuated Meander-Suspended Superconducting MEMS

N. AlCheikh[1], P. Xavier[1], J.M. Duchamp[1], C.H. Boucher[2], and K. Schuster[2]
[1]Institute of Microelectronics, Electromagnetism and Photonics (IMEP-LAHC), Minatec, Grenoble, France
[2]Institute of Millimetric Radio Astronomy (IRAM), Grenoble, France

Variable capacitors between the fF and pF range are very interesting for high frequency applications like variable filters, resonators, etc. For radio astronomy applications variable capacitors, realized by electrostatically actuated, micromechanical Meanders-suspended bridges (MEMS) made of superconducting Niobium, have been measured to find C(V). A non plane capacitance behavior have been ...

Modelagem Computacional de Difusores para Microbombas

A. G. S. Barreto Neto [1], A. M. N. Lima [2], C. S. Moreira [1],
[1] Instituto Federal de Ciência e Tecnologia - IFPB, João Pessoa, PB, Brasil
[2] Universidade Federal de Campina Grande - UFCG, Campina Grande, PB, Brasil

Este trabalho trata do dimensionamento da estrutura bocal/difusor utilizando a simulação computacional com fronteira móvel. Esse tipo de simulação contempla toda estrutura da bomba, isto é, câmara de bombeamento, difusor e área de dispersão de fluxo, de modo a contabilizar o refluxo em função da estrutura, possibilitando um projeto mais realísticos da estrutura.

Optimized Cantilever-to-Anchor Configurations of Buckled Cantilever Plate Structures for Transducer Applications

A. Arpys Arevalo Carreno[1], D. Conchouso Gonzalez[1], I.G. Foulds[1]
[1]King Abdullah University of Science and Technology, Thuwal, Mecca, Kingdom of Saudi Arabia

The mechanical simulation and analysis of the cantilever-to-anchor configuration for an out-of-plane structure used in transducer applications is reported. The polymer-based Buckled Cantilever Plate “BCP” structure, gives the ability to orient an active device from a horizontal to a vertical position, once assembled. In this paper we compare four different cantilever-to-anchor configurations: ...

COMSOL Multiphysics for the Designs and Applications on Biomicrofluidic Chips

I-Fang Cheng[1]
[1]National Nano Device Laboratories (NDL), National Applied Research Laboratories, Taipei, Taiwan

Some types of rare pathogens can be detected and identified in human blood through a low-cost and label-free method. The On-Chip SESR identification process has a fast detection time (about 5 minutes) and a low detection limit. Discrimination of a species is done by sorting red blood cells from bacteria. Simulations of dielectrophoretic (DEP) force, dual layer electrodes, and dynamic separation ...

Resonant Frequency Analysis of Quartz Shear Oscillator

T. Satyanarayana[1], V. Sai Pavan Rajesh[2]
[1]NPMASS Centre, Lakireddy Bali Reddy Autonomous Engineering College, Mylavaram, Andhra Pradesh, India
[2]Lakireddy Bali Reddy Autonomous Engineering College, Mylavaram, Andhra Pradesh, India

The most commonly used type of resonator is the AT-cut, where the quartz blank is in the form of a thin plate cut at an angle to the optic axis of the crystal. This paper reports the modeling of a quartz oscillator for a resonant frequency analysis based on piezoelectric effects. The proposed oscillator consists of a single quartz disc with two electrodes on the top and bottom surfaces of the ...

MEMS Based Tactile Sensors for Robotic Surgery

V. Nivethitha[1], S. P. Rakavi[1], K. C. Devi[1]
[1]PSG College Of Technology, Coimbatore, Tamil Nadu, India

In this work, a piezoelectric tactile sensor will be designed and simulated using COMSOL Multiphysics®. The sensor is designed in order to assess the pressure exerted on the human body while the robotic surgery is performed. The sensor consists of a rigid and compliant cylindrical element. A circular PDMS (Polydimethylsiloxane) film is sandwiched between the rigid cylinder and the base plate to ...

Modelling of SiC Chemical Vapour Infiltration Process Assisted by Microwave Heating

G. Maizza[1] and M. Longhin[1]
[1]Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, Torino, Italy

The excessive presence of residual SiC matrix inter-fiber pores is often the main cause for the very poor mechanical strength and toughness of SiC/SiC composites manufactured by CVI (Chemical Vapour Infiltration) process. This work presents a micro/macro Microwaveassisted Chemical Vapour Infiltration (MW-CVI) model as a strategy to attack the problems above. The proposed model couples a reactor ...