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The through silicon interconnection technology for stacked dies is a promising way of future package construction as it lowers yield risks of large die sizes and allows cost effective packaging solutions for heterogeneous electronic systems. Thermo-mechanical reliability dependent on processing and mounting steps as well as during testing are one major concern, which was addressed by FEA. The numerical...
Behavior of epoxy resin is critical for performance and reliability of electronic packages. The ability to predict properties of cross linked epoxy resin prior to laboratory synthesis will facilitate the materials design. Theoretical studies in this field face a big challenge because there is no conventional way to build atomistic models of specific polymers, which form a network. Molecular dynamics...
The present work examines porous scaffolds preparation methods by combining salt leaching, gas forming, solvent evaporation and phase separation techniques. The scaffolds are intended for bone tissue regeneration. It aims to combine the biodegradability of poly (epsiv-caprolactone) (PCL) with the osteoconductive properties of hydroxylapatite (HA) in order to create a composite which acts as a temporary...
One of the main goals of bioelectronics research is to develop an understanding of the interface between biological systems and electronic materials. Toward this goal we investigate the growth of three cell lines that include normal and malignant cells on the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with p-toluenesulfonate (Tosylate, Tos). The results show that electrical...
The aim of present study is to characterize the physical properties of the PLGA-gelatin/HA composite scaffold and its ability for chondrocytes' attachment for cartilage tissue engineering applications. The 3D porous PLGA scaffold was fabricated by salt leaching method, and surface was integrated with gelatin and hyaluronic acid by crosslinked with 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide EDC...
Polyurethane xerogels with open pore networks were created via solution-gelation (sol-gel) polymerization. The solubility parameters of the solvent(s) and prepolymers and equilibrium swelling and extraction data were both used to select solvent(s) giving porous xerogels. Polycaprolactone (PCL) diol was combined with either poly(tetramethylene glycol) (PTMEG) or castor oil (CO), and the prepoplymer...
The use of temperature and time dependent material parameters is state-of-the-art in mechanical engineering. An advanced measurement method for the determination of moisture dependent parameters for micro and nano scale samples was developed. In combination with FE-analysis, this tool (involving time, temperature, and humidity) ensures a sure deployability. The present paper deals with the influence...
PVA and chitosan have been used for many tissue engineering applications. However, most of the studies use only single polymer to fabricate nanofibers. Therefore, the purpose of this study is to fabricate PVA and PVA/Chitosan nanofiber scaffold for potential tissue engineering applications. The nanofrous scaffold was produced via electrospinning. NIH 3T3 fibroblast cells were seeded onto scaffolds...
A range of novel biomass-derived sunscreens and additives were synthesized by substituting corn-produced isosorbide with different functional moieties, such as naturally-occurring cinnamic acids. Based on the different reactivity of the two isosorbide hydroxyl groups, an effective synthetic route was developed for making multifunctional molecules such as UV-absorbing polymer plasticizers and antioxidants...
We wish to form polymeric bioreactors with interconnected microfluidic channels between walls or struts that have cells embedded or attached to the surface. A Rapid Prototyping (RP) fabrication technique is employed, using blue light curing to crosslink water-soluble monomers to hydrogels. The 3D writing is carried out by a computer-controlled syringe system that extrudes a fine line of monomer. The...
Physically crosslinked Polyurethane-b-polyacrylamide (PU-b-PAAm) hydrogels have been synthesized using dithiocarbamate (DC)-based polyurethane macroiniferter (PUMI). The prepared materials have been characterized using GPC and spectroscopic analysis. The detailed transport behavior of these hydrogels has been investigated.
High flux dialysis the first choice of therapy for hemodialysis patients within the last decade due to its clinical outcome. In this study the effect of dialysis environment on the mechanical and structural stability of high flux dialyzers containing polysulfone membranes were investigated. Dialysis sessions were performed on a certain group of patients with dialysis ages less than two years and without...
Both stabilizer and couple-agent can affect the melt index of composite materials. Moreover, the different varieties of same stabilizer and couple-agents also results in the difference of melt index of composite materials. The result of melt index test showed that, under the test condition of load 21.6 kg and temperature 190 degC, the melt index of bamboo-plastic composite which was added hot stabilizer...
In this paper, electron-beam (e-beam) lithography for processing of surface acoustic wave devices is investigated, and its suitability for large-scale processing discussed. Electron-beam lithography is used for exposure of surface acoustic wave (SAW) resonator patterns on polymethyl methacrylate (PMMA) coated piezoelectric substrates. Electron-beam lithography can be used for high frequency SAW designs,...
The use of the molded interconnect device technology combined with the laser direct structuring technology exhibits the potential of designing electrical and mechanical components on three-dimensional surfaces to increase functionality, level of integration and to reduce costs. When taking advantage of these technologies especially in the design of RF devices, a precise knowledge of the electromagnetic...
This paper presents a design on a small robotic fish with infrared remote receiver and IPMC actuator, and verifies that using IPMC as an actuator is feasible. In our experiment, we compare results of the robotic fish's speed in different actuating signal, such as square wave and sine wave. We also give the results of robotic fish's speed in different frequency and amplitude.
In order to get a deeper understanding of the conduction mechanisms limiting the electrical characteristics of ITO/PEDOT:PSS/P3HT:PCBM/Al solar cells, dark current-voltage measurements at different temperatures were analyzed using a compact electrical equivalent circuit previously used in p/n junctions. Between 0.2 V and 0.6 V, the current-voltage characteristic is modeled by an exponential term which...
This research work presents the scientific approach used to qualify polymers for airborne power electronic packaging. Three types of polymer were studied, each of them having to fulfil specific function in a power module. Firstly, four high temperature polymers were pre-selected for external housing and their properties were investigated in two model ageing environments. Very different ageing mechanisms...
The ultra-small form factor of the electronic components along with a reliable and inexpensive high-density interconnect technology are the key factors in bringing flexible electronics to the next level of miniaturization without compromising performance and substantially increasing production cost. The common thick-film methods used today to fabricate conductive trace patterns on flexible boards...
The deposition of specific materials into ordered pores arranged in a regular lattice allows the fabrication of ordered fiber arrays. Polymer micro- and nanofibers using macroporous silicon and nanoporous alumina templates were fabricated employing a vacuum infiltration method for Poly(methyl methacrylate) (PMMA) structures or a melt-assisted template wetting into the pores for Poly(3-hexylthiophene)...
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