E. Engelien

Publications (2)0 Total impact

• Conference Proceeding: Membrane behaviour of Parylene C as housing material

  E. Engelien, N. Beshchasna, M. Braunschweig, J. Uhlemann, K.-J. Wolter
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  ABSTRACT: Investigation methods on polymer encapsulation were implemented to determine the quality of a polymer coating on electronic devices against migration and diffusion. Therefore the major goal was to evaluate a membrane of Parylene C clamped in a frame. Two different fluids in chambers on each side of the membrane, bi-distillated water and water with solute salt, generate concentration gradient. The potential drop drives ions through the membrane. With the analysis of the conductivity in the chamber with bi-distilled water the transmission rate of the molecules can be determined in dependence of mass and thickness to area and time. These tests have shown a coefficient for the transmission rate of NaCl. The inspection with the scanning electron microscope as well as measuring the surface roughness conducted to first information about thin Parylene C layers.
  Electronics Technology, 2008. ISSE '08. 31st International Spring Seminar on; 06/2008
• Conference Proceeding: Surface degradation of Sn-contained electronic packaging materials in simulated body fluids

  N. Beshchasna, E. Engelien, J. Uhlemann, K.J. Wolter
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  ABSTRACT: For electronic medical devices which are intended to function inside the human body is very important to keep unchangeable their structural and functional properties under an influence of aggressive physiological factors. For stability testing of some electronic materials in laboratory conditions a simulation of human body fluid environment has been used. Sn-contained electronic packaging materials as a) FR4 + 1.2 44 m chemical Sn; b) FR4 + hot air leveling (HAL) Sn and c) FR4 + Sn 3.5 Ag 0.7 Cu were brought in dynamical interaction with artificial blood plasma, cerebrospinal fluid and 0.9% NaCl solution. Alterations in the surface topography and its chemical composition were studied. Materials mass losses in the surface ratio were determined depending on the soaking time. As a protection procedure against the influence of aggressive fluidic environment 1 mum and 2.5 mum layers of parylene C were deposited on chemical Sn and HAL Sn surfaces. Hydrolytic stability of protected materials has been determined.
  Electronics Technology, 2008. ISSE '08. 31st International Spring Seminar on; 06/2008