The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
C.K.Y. Wong - One of the best experts on this subject based on the ideXlab platform.
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Effect of UV/ozone treatment on surface tension and adhesion in electronic packaging
Components and Packaging Technologies, IEEE Transactions on, 2001Co-Authors: Shijian Luo, C.K.Y. WongAbstract:Surface tension of material surfaces and interfaces is an important parameter that affects wetting and adhesion. Surface tension can be divided into three Components: Lifshitz-van der Waals Component, Acid Component, and base Component. In this study, the three-liquid-probe method was used to investigate the surface tension and its three Components of various surfaces of electronic packaging materials: benzocyclobutene (BCB) passivation, FR-4 board, polyimide board, and alumina board. When UV/ozone was employed to treat the surfaces, the surface tension increased, and the base Component increased the most. The change in surface tension due to UV/O3 treatment decayed with time after the treatment. The difference in surface tension between untreated and treated surface became smaller with the increase of time after UV/O3 treatment. Different substrates showed different rate of decay in surface tension change. Among the surfaces studied, BCB passivation showed the fastest decay after treatment, while alumina showed the slowest decay. The contact angles of several liquid underfill materials on BCB passivation and their surface tension before and after curing were also measured. It was found that the wetting was not the controlling factor in adhesion of the system investigated
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Study on surface tension and adhesion in electronic packaging
Electronic Components & Technology Conference, 2000. 2000 Proceedings. 50th, 2000Co-Authors: Shijian Luo, M. Vidal, C.K.Y. WongAbstract:Different materials are used in electronic packaging, and thus there are many interfaces in an electronic package, and the adhesion at these interfaces is critical to the reliability of the assembly. Surface tension and its three Components (Lifshitz-van der Waals Component, Acid Component, and base Component) are important parameters that affect the adhesion. In order to improve the wetting and thus possibly adhesion of underfill material with substrate and passivation of flip-chip device, some techniques can be employed to modify the surfaces. It is necessary to understand the surface behavior before and after treatment, and its effect on adhesion. In this study, the three-liquid-probe method was used to investigate the surface tension and its three Components of various surfaces: benzocyclobutene (BCB) passivation, FR-4 board, polyimide board, and alumina board. The surface tension was changed with treatment by UV/ozone, which was indicated by the contact angle measurement. The base Component increased most after UV/O3 treatment. It was also shown that the change in contact angle decayed as time elapsed after treatment. Different substrates showed different decay rate. Among the surfaces studied, BCB passivation showed the fastest decay rate after treatment; while, alumina showed the slowest decay rate. The contact angles of several liquid underfill materials on BCB passivation and their surface tension before and after curing were also measured; the wetting was not the controlling factor in adhesion of the system investigated
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Surface tension study of substrates in electronic packaging
Advanced Packaging Materials: Processes, Properties andInterfaces, 2000. Proceedings. International Symposium on, 2000Co-Authors: Shijian Luo, M. Vidal, C.K.Y. WongAbstract:There are many interfaces in electronic packaging, and the adhesion at those interfaces is critical to the reliability of the assembly. Surface tension of the surfaces and its three Components (Lifshitz-van der Waals Component, Acid Component, and base Component) are important parameters that affect the adhesion. In order to improve the wetting and thus possibly adhesion of underfill material with substrate and passivation of flip-chip device, some techniques can be employed to modify the surfaces. In this study, the three-liquid-probe method was used to study the surface tension and its three Components of various surfaces: benzocyclobutene (BCB) passivation, FR-4 board, polyimide board, and alumina board. The surface tension was changed with the treatment of UV/ozone, which was indicated by the contact angle measurement. The base Component increased most after UV/O3 treatment. It was also shown that the change in contact angle decayed as time elapsed after treatment. Different substrates showed different decay rate. Among the surfaces studied, BCB passivation showed the fastest decay rate after treatment; while, alumina showed the slowest decay rate
Shijian Luo - One of the best experts on this subject based on the ideXlab platform.
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Effect of UV/ozone treatment on surface tension and adhesion in electronic packaging
Components and Packaging Technologies, IEEE Transactions on, 2001Co-Authors: Shijian Luo, C.K.Y. WongAbstract:Surface tension of material surfaces and interfaces is an important parameter that affects wetting and adhesion. Surface tension can be divided into three Components: Lifshitz-van der Waals Component, Acid Component, and base Component. In this study, the three-liquid-probe method was used to investigate the surface tension and its three Components of various surfaces of electronic packaging materials: benzocyclobutene (BCB) passivation, FR-4 board, polyimide board, and alumina board. When UV/ozone was employed to treat the surfaces, the surface tension increased, and the base Component increased the most. The change in surface tension due to UV/O3 treatment decayed with time after the treatment. The difference in surface tension between untreated and treated surface became smaller with the increase of time after UV/O3 treatment. Different substrates showed different rate of decay in surface tension change. Among the surfaces studied, BCB passivation showed the fastest decay after treatment, while alumina showed the slowest decay. The contact angles of several liquid underfill materials on BCB passivation and their surface tension before and after curing were also measured. It was found that the wetting was not the controlling factor in adhesion of the system investigated
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Study on surface tension and adhesion in electronic packaging
Electronic Components & Technology Conference, 2000. 2000 Proceedings. 50th, 2000Co-Authors: Shijian Luo, M. Vidal, C.K.Y. WongAbstract:Different materials are used in electronic packaging, and thus there are many interfaces in an electronic package, and the adhesion at these interfaces is critical to the reliability of the assembly. Surface tension and its three Components (Lifshitz-van der Waals Component, Acid Component, and base Component) are important parameters that affect the adhesion. In order to improve the wetting and thus possibly adhesion of underfill material with substrate and passivation of flip-chip device, some techniques can be employed to modify the surfaces. It is necessary to understand the surface behavior before and after treatment, and its effect on adhesion. In this study, the three-liquid-probe method was used to investigate the surface tension and its three Components of various surfaces: benzocyclobutene (BCB) passivation, FR-4 board, polyimide board, and alumina board. The surface tension was changed with treatment by UV/ozone, which was indicated by the contact angle measurement. The base Component increased most after UV/O3 treatment. It was also shown that the change in contact angle decayed as time elapsed after treatment. Different substrates showed different decay rate. Among the surfaces studied, BCB passivation showed the fastest decay rate after treatment; while, alumina showed the slowest decay rate. The contact angles of several liquid underfill materials on BCB passivation and their surface tension before and after curing were also measured; the wetting was not the controlling factor in adhesion of the system investigated
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Surface tension study of substrates in electronic packaging
Advanced Packaging Materials: Processes, Properties andInterfaces, 2000. Proceedings. International Symposium on, 2000Co-Authors: Shijian Luo, M. Vidal, C.K.Y. WongAbstract:There are many interfaces in electronic packaging, and the adhesion at those interfaces is critical to the reliability of the assembly. Surface tension of the surfaces and its three Components (Lifshitz-van der Waals Component, Acid Component, and base Component) are important parameters that affect the adhesion. In order to improve the wetting and thus possibly adhesion of underfill material with substrate and passivation of flip-chip device, some techniques can be employed to modify the surfaces. In this study, the three-liquid-probe method was used to study the surface tension and its three Components of various surfaces: benzocyclobutene (BCB) passivation, FR-4 board, polyimide board, and alumina board. The surface tension was changed with the treatment of UV/ozone, which was indicated by the contact angle measurement. The base Component increased most after UV/O3 treatment. It was also shown that the change in contact angle decayed as time elapsed after treatment. Different substrates showed different decay rate. Among the surfaces studied, BCB passivation showed the fastest decay rate after treatment; while, alumina showed the slowest decay rate
Jan Tack - One of the best experts on this subject based on the ideXlab platform.
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review article the role of bile and pepsin in the pathophysiology and treatment of gastro oesophageal reflux disease
Alimentary Pharmacology & Therapeutics, 2006Co-Authors: Jan TackAbstract:Summary Gastro-oesophageal reflux disease is a multifaceted and multifactorial disorder which results from the reflux of gastric contents into the oesophagus. Animal studies suggest that synergism between Acid and pepsin and conjugated bile Acids have the greatest damaging potential for oesophageal mucosa, although unconjugated bile Acids may be caustic at more neutral pH. Human studies are compatible with a synergistic action between Acid and duodenogastric reflux in inducing lesions. During prolonged monitoring studies, typical gastro-oesophageal reflux symptoms are more related to Acid reflux events than to non-Acid reflux events. However, symptoms that persist during Acid suppressive therapy are often related to non-Acid reflux events. The therapeutic options for the non-Acid Component of the refluxate, including Acid suppression, prokinetics, baclofen, surgery and mucosal protective agents like alginates, are discussed.
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review article role of pepsin and bile in gastro oesophageal reflux disease
Alimentary Pharmacology & Therapeutics, 2005Co-Authors: Jan TackAbstract:Summary Gastro-oesophageal reflux disease is defined as the presence of symptoms or lesions that can be attributed to the reflux of gastric contents into the oesophagus. Aspiration and prolonged monitoring studies in humans have shown that reflux of gastric contents is comprised of both Acid and non-Acid Components, in healthy as well as diseased people. Methods to monitor the non-Acid Component of the refluxate are described in detail. Experimental models suggest that synergism between Acid and pepsin and conjugated bile Acids have the greatest damaging potential for oesophageal mucosa, although unconjugated bile Acids may be caustic at a more neutral pH. Human studies are compatible with a synergistic action between Acid and duodenogastric reflux in inducing lesions. During prolonged monitoring studies, typical gastro-oesophageal reflux disease symptoms are more related to Acid reflux events than to non-Acid reflux events. However, symptoms that persist during Acid-suppressive therapy are often related to non-Acid reflux events. The therapeutic options for the non-Acid Component of the refluxate, including Acid suppression, prokinetics, baclofen and surgery, are discussed.
P. Alcouffe - One of the best experts on this subject based on the ideXlab platform.
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Effect of surface treatment and functionalization on the ITO properties for OLEDs
Materials Science and Engineering: C, 2006Co-Authors: Souhail Besbes, H. Ben Ouada, Joël Davenas, L. Ponsonnet, Nicole Jaffrezic-renault, P. AlcouffeAbstract:The relation between ITO morphology and surface properties has been studied by wettability measurements and AFM microscopy. Different wet cleaning procedures have been investigated leading to different surface properties: ultrasonic degreasing, RCA and Aqua regia treatment. After full elimination of the organic surface contaminants, the ITO surface shows a main basic surface Component. RCA and Aqua regia treatments are the most efficient techniques for cleaning ITO surfaces from organic contamination. Nevertheless, Aqua regia treatment induces ITO surface degradation, which is evidenced by AFM observations and resistance sheet measurements. The ITO surface has been derivatized with a SAM layer of phosphonic Acid to improve the ITO/polymer interface. Effect of 2-chloroethylphosphonic Acid layer on the different Components of the surface energy was determined: Acid Component is increased whereas basic Component is decreased, showing the good coverage of the ITO surface by the SAM layer. A more compact coating of POMX polymer is obtained after SAM functionalization of ITO samples cleaned with RCA treatment.
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Effect of surface treatment and functionalization on the ITO properties for OLEDs
Materials Science and Engineering C, 2006Co-Authors: Souhail Besbes, H. Ben Ouada, Joël Davenas, N. Jaffrezic, L. Ponsonnet, P. AlcouffeAbstract:The relation between ITO morphology and surface properties has been studied by wettability measurements and AFM microscopy. Different wet cleaning procedures have been investigated leading to different surface properties: ultrasonic degreasing, RCA and Aqua regia treatment. After full elimination of the organic surface contaminants, the ITO surface shows a main basic surface Component. RCA and Aqua regia treatments are the most efficient techniques for cleaning ITO surfaces from organic contamination. Nevertheless, Aqua regia treatment induces ITO surface degradation, which is evidenced by AFM observations and resistance sheet measurements. The ITO surface has been derivatized with a SAM layer of phosphonic Acid to improve the ITO/polymer interface. Effect of 2-chloroethylphosphonic Acid layer on the different Components of the surface energy was determined: Acid Component is increased whereas basic Component is decreased, showing the good coverage of the ITO surface by the SAM layer. A more compact coating of POMX polymer is obtained after SAM functionalization of ITO samples cleaned with RCA treatment. © 2005 Elsevier B.V. All rights reserved.
Goerge Deerberg - One of the best experts on this subject based on the ideXlab platform.
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Thermal storage by thermoreversible chemical reaction systems
Energy Procedia, 2014Co-Authors: Matthias Fischer, Stefano Bruzzano, Baerbel Egenolf-jonkmanns, Barbara Zeidler-fandrich, Holger Wack, Goerge DeerbergAbstract:Recent research work on the development of smart pumpable materials for thermal storage at temperatures below 200 °C will be presented. Currently two different systems being analyzed: additive enhanced CO2-hydrates for climate and cooling purposes and neutralization reactions of organic Acids with nitrogen bases for waste heat utilization. CO2-hydrate formation and growth are studied while using hydrogel additives of different morphological structure. In particular hydrogels with a low content of crosslinker significantly promotes the hydrate formation. Several combinations of organic Acids and bases are tested in mixing experiments and show that high energy densities can be obtained by these neutralization reactions in liquid systems. Special emphasis is put on the option of long-term-storage of heat. This possibility is demonstrated by distilling off the Acid Component for the reference reaction system trioctylamine and acetic Acid.
