An Experimental Study of Pressure- and Electroosmotically-driven Flows in Microchannels with Surface Modifications PDF Download
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Author: Chee Leong Lum
Publisher:
ISBN:
Category : Electro-osmosis
Languages : en
Pages : 402
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Book Description
Author: Chee Leong Lum
Publisher:
ISBN:
Category : Electro-osmosis
Languages : en
Pages : 402
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Book Description
Author: Alexander J. Smits
Publisher: World Scientific
ISBN: 184816792X
Category : Technology & Engineering
Languages : en
Pages : 442
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Book Description
This is the 2nd edition of the book, Flow Visualization: Techniques and Examples, which was published by Imperial College Press in 2000. Many of the chapters have been revised and updated to take into consideration recent changes in a number of flow visualization and measurement techniques, including an updated high quality flow gallery. Unique among similar publications, this book focuses on the practical rather than theoretical aspects. Obtaining high quality flow visualization results is, in many ways, more of an art than a science, and experience plays a key deciding role. The depth and breadth of the material will make this book invaluable to readers of all levels of experience in the field.
Author: Zeyad Almutairi
Publisher:
ISBN: 9780494435755
Category :
Languages : en
Pages : 124
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Book Description
Electroosmotic flow is widely used as a solution pumping method in numerous microfluidic applications. This type of flow has several advantages over other pumping techniques, such as the fast response time, the ease of control and integration in different microchannel designs. The flow utilizes the scaling of channel dimensions, which enhances the effects of the electrostatic forces to create flow in microchannels under an electrical body force. However, the electrostatic properties of the solution/wall material pairings are unique and must be experimentally measured. As a consequence, accurate knowledge about the electrostatic properties of the solution and wall material pairings is important for the optimal design of microfluidic devices using electroosmotic flow. Moreover, the introduction of new solutions and new channel materials for different applications is common in the microfluidics area. Therefore, any improvement on the experimental techniques used to examine the electrostatic properties of microchannels is beneficial to the research community. In this work, an improvement to the current-monitoring technique for studying the electrokinetic properties of microchannels is achieved by replacing the conventional straight channel design with a new Y-channel design. The errors from both the undesired pressure driven flow and solution electrolysis were addressed and significantly reduced. The new design offers high accuracy in finding the electrokinetic properties of microchannels. The experimental outcome from the new channel design is better compared to the outcomes of the straight channel, which helps in distinguishing the important electroosmotic pumping regions from the current-time plot. Moreover the time effectiveness in performing the experiments with the new channel design is better compared to that for the straight channel design. A modified analysis approach is also presented and validated for finding the electrokinetic properties from the outcomes of the current-monitoring technique, which is called the current-slope method. This approach is validated by comparing its findings with the results of the conventional length method. It was found for most situations that the discrepancy between the two methods, the current-slope and total length method, are within the uncertainty of the experimental measurements, thus validating the new analysis approach. In situations where it is hard to distinguish the start and end of solution replacement from the current-time plot of the current-monitoring technique, the current-slope method is advised. With the new design, different parametric studies of electroosmotic flow in PDMS based microchannels are estimated. At first the zeta potential of biological buffers are studied. Moreover the effect of continuous electroosmotic pumping, the chip substrate structure, and temperature on the average zeta potential of microchannels are examined. It was found that for air plasma treated PDMS microchannels the chip substrate material does not have an effect on the average zeta potential of the microchannels. The following chemical treatments are attempted with the aim of improving the surface and electrostatic properties of PDMS based microchannels: prepolymer additive with acrylic acid, extraction of PDMS, and both heat and plasma induced HEMA (Hydroxyethyl methacrylate) grafting on the surface of PDMS. Extensive characterization is performed with different experimental methods. The stability of the artificial hydrophilic properties of the PDMS microchannels with time was improved with both the extraction and HEMA grafting techniques. On the other hand, there was no evidence of any improvement in the zeta potential of microchannels with the surface treatments.
Author: Cameron Tropea
Publisher: Springer Science & Business Media
ISBN: 3540251413
Category : Science
Languages : en
Pages : 1570
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Book Description
Accompanying DVD-ROM contains ... "all chapters of the Springer Handbook."--Page 3 of cover.
Author: J. Michael Ramsey
Publisher: Springer Science & Business Media
ISBN: 9401010153
Category : Science
Languages : en
Pages : 722
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Book Description
The Fifth International Conference on Micro Total Analysis Systems, also known as JlTAS 2001, will highlight the latest exciting events in the world ofminiaturized devices and systems for performing chemical and biochemical experimentation This conference has become mandatory for those of us working in this field as it is indeed helping to define our discipline. We are grateful to the people of the MESA Research Institute of the University of Twente, particularly Piet Bergveld and Albert van den Berg, for starting this meeting in 1994. Their original intention was for the JlTAS meeting to be a small informal workshop. This workshop flavor was sustained through the second meeting held in Basel in 1996, but already in 1998 at the third meeting in Banff it was clear that the "workshop" had become a conference with 420 attendees. It was due to this clearly growing interest in microchemical systems that it was decided we should consider gradually moving toward an annual format and prepare for the possibility that the meeting would increase in popularity. Albert van den Berg was still yearning for a workshop at the JlTAS 2000 meeting and planned a single session format. Again there was a large increase in submitted abstracts (more than 230 total) and a further increase in attendance. The JlTAS steering committee again agreed that we would have to prepare to address the demand the meeting was receiving.
Author: Shahram Pouya
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
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Book Description
Author: Satish Kandlikar
Publisher: Elsevier
ISBN: 9780080445274
Category : Science
Languages : en
Pages : 492
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Book Description
&Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Author: C.B. Sobhan
Publisher: CRC Press
ISBN: 1000654214
Category : Science
Languages : en
Pages : 317
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Book Description
Through analyses, experimental results, and worked-out numerical examples, Microscale and Nanoscale Heat Transfer: Fundamentals and Engineering Applications explores the methods and observations of thermophysical phenomena in size-affected domains. Compiling the most relevant findings from the literature, along with results from their own re
Author: Henrik Bruus
Publisher: Oxford University Press
ISBN: 0191528587
Category : Science
Languages : en
Pages :
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Book Description
Microfluidics is a young and rapidly expanding scientific discipline, which deals with fluids and solutions in miniaturized systems, the so-called lab-on-a-chip systems. It has applications in chemical engineering, pharmaceutics, biotechnology and medicine. As the lab-on-a-chip systems grow in complexity, a proper theoretical understanding becomes increasingly important. The basic idea of the book is to provide a self-contained formulation of the theoretical framework of microfluidics, and at the same time give physical motivation and examples from lab-on-a-chip technology. After three chapters introducing microfluidics, the governing equations for mass, momentum and energy, and some basic flow solutions, the following 14 chapters treat hydraulic resistance/compliance, diffusion/dispersion, time-dependent flow, capillarity, electro- and magneto-hydrodynamics, thermal transport, two-phase flow, complex flow patterns and acousto-fluidics, as well as the new fields of opto- and nano-fluidics. Throughout the book simple models with analytical solutions are presented to provide the student with a thorough physical understanding of order of magnitudes and various selected microfluidic phenomena and devices. The book grew out of a set of well-tested lecture notes. It is with its many pedagogical exercises designed as a textbook for an advanced undergraduate or first-year graduate course. It is also well suited for self-study.
Author: Ronald F. Probstein
Publisher: Butterworth-Heinemann
ISBN: 1483162222
Category : Science
Languages : en
Pages : 368
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Book Description
Physicochemical Hydrodynamics: An Introduction aims to provide an introduction to physicochemical hydrodynamics (PCH), which deals with the interaction between fluid flow and physical, chemical, and biochemical processes. PCH has applications in many areas of science and technology and is a rapidly expanding field. Emphasis of this book is on rational theory and its consequences, with the purpose of showing the underlying unity of PCH, in which diverse phenomena can be described in physically and mathematically similar ways. The magic of this unity is shown in the similar manner in which solutes concentrate in a flow containing chemically reacting surfaces, reverse osmosis membranes, and electrodialysis membranes or the similarity of particle motions in sedimentation, centrifugation, ultrafiltration, and electrophoresis. Problems are included at the end of each chapter and are ordered following the sequence in which the material is set out. The questions range in difficulty, with most requiring an analytic development, but with some asking only for a descriptive answer. All problems are intended to illustrate the ideas presented, though often the solution goes beyond the explicit discussion in the book, with the answer constituting a generalization or extension of the text material. This book is an essential source of information for students majoring in the field of PCH.
