@article{MellingerWegenerWirgesetal.2006,
  author    = {Mellinger, Axel and Wegener, Michael and Wirges, Werner and Mallepally, Rajendar Reddy and Gerhard, Reimund},
  title     = {Thermal and temporal stability of ferroelectret films made from cellular polypropylene/air composites},
  year      = {2006},
  language  = {en}
}
@article{QiuMellingerWirgesetal.2007,
  author    = {Qiu, Xunlin and Mellinger, Axel and Wirges, Werner and Gerhard, Reimund},
  title     = {Spectroscopic study of dielectric barrier discharges in cellular polypropylene ferroelectrets},
  doi       = {10.1063/1.2786597},
  year      = {2007},
  abstract  = {The transient light emission from the dielectric barrier discharges (DBDs) in cellular polypropylene ferroelectrets subjected to high electric poling fields was spectroscopically measured. The spectrum shows strong emission from the second positive system of molecular nitrogen, N-2(C (3)Pi(u))-> N-2(B (3)Pi(g)), and the first negative system of N-2(+), N-2(+)(B (2)Sigma(+)(u))-> N-2(+)(X (2)Sigma(+)(g)), consistent with a DBD in air. When a dc voltage is applied stepwise to the ferroelectret film, light emission starts above a threshold, coinciding with the threshold voltage in obtaining piezoelectricity. From selected vibronic band strength ratios, the electric field in the discharge was determined and found to agree with Townsend breakdown.},
  language  = {en}
}
@article{MellingerGonzalezGerhardetal.2002,
  author    = {Mellinger, Axel and Gonzalez, Francisco Camacho and Gerhard, Reimund and Santos, Lucas F. and Faria, Roberto M.},
  title     = {Phototstimulated discharge of corona and electron-beam charged electret polymers},
  isbn      = {0-7803-7560-2},
  year      = {2002},
  language  = {en}
}
@article{MellingerCamachoGonzalezGerhard2004,
  author    = {Mellinger, Axel and Camacho Gonz{\´a}lez, Francisco and Gerhard, Reimund},
  title     = {Photostimulated discharge in electret polymers : an alternative approach for investigating deep traps},
  year      = {2004},
  abstract  = {The stability of space charge in electrets such as polytetrafluoroethylene (PTFE), polyethylene terephthalate (PETP) and polypropylene (PP) under ultraviolet irradiation has been investigated using photostimulated discharge spectroscopy. While only weak discharge currents were observed in PTFE coated with semitransparent gold electrodes, up to 15 pA/cm(2) were found in PETP around the UV absorption edge near 310 nm. Space charge profiles obtained with the piezoelectrically generated pressure step method indicate that near-surface charges were almost completely removed. In PP foam, recent findings of a UV-reduced d(33) coefficient were confirmed for exposure times of up to 3.5 h, and a discharge peak at 200 urn could be assigned to the charges stored on the surfaces of the voids. The unique morphology and the (quasi-) piezoelectric properties of cellular PP make it a role model for the future investigation of charge storage in electrets},
  language  = {en}
}
@article{GonzalezMellingerGerhardetal.2002,
  author    = {Gonzalez, Francisco Camacho and Mellinger, Axel and Gerhard, Reimund and Santos, Lucas F. and Faria, Roberto M.},
  title     = {Photo-stimulated discharge of highly insulating polymers (PTFE and PETP)},
  isbn      = {0-7803-7502-5},
  year      = {2002},
  language  = {en}
}
@article{SinghMellinger2015,
  author    = {Singh, Rajeev and Mellinger, Axel},
  title     = {Measurement of through-thickness thermal diffusivity of thermoplastics using thermal wave method},
  series = {Indian journal of physics},
  volume    = {89},
  journal   = {Indian journal of physics},
  number    = {4},
  publisher = {Indian Association for the Cultivation of Science},
  address   = {Kolkata},
  issn      = {0973-1458},
  doi       = {10.1007/s12648-014-0579-2},
  pages     = {361 -- 368},
  year      = {2015},
  abstract  = {Thermo-physical properties, such as thermal conductivity, thermal diffusivity and specific heat are important quantities that are needed to interpret and characterize thermoplastic materials. Such characterization is necessary for many applications, ranging from aerospace engineering to food packaging, electrical and electronic industry and medical science. In this work, the thermal diffusivity of commercially available polymeric films is measured in the thickness direction at room temperature using thermal wave method. The results obtained with this method are in good agreement with theoretical and experimental values.},
  language  = {en}
}
@article{FloresSuarezGanesanWirgesetal.2010,
  author    = {Flores Su{\´a}rez, Rosaura and Ganesan, Lakshmi Meena and Wirges, Werner and Gerhard, Reimund and Mellinger, Axel},
  title     = {Imaging liquid crystals dispersed in a ferroelectric polymer matrix by means of thermal-pulse tomography},
  issn      = {1070-9878},
  doi       = {10.1109/TDEI.2010.5539683},
  year      = {2010},
  abstract  = {A new arrangement of the optical elements in a Thermal-Pulse-Tomography (TPT) setup allows to scan micrometer structures in composite and heterogeneous samples such as polymer-dispersed liquid crystals (PDLCs). The non-destructive TPT technique allows the determination of three-dimensional profiles of polarization and space charge in dielectrics. The samples under study were 12 mu m thick films of a copolymer of vinylidene fluoride with trifluoroethylene P(VDF- TrFE) (65/35) with embedded liquid-crystal droplets. The poling process was performed in direct contact well above the coercive field of the copolymer. The 3D map obtained from scanning with a 10 mu m wide spot shows elliptically shaped areas with liquid-crystal droplets. Considering the droplets as oblate spheroids, their major axis lies in the x-y plane, while their minor axis in the z direction measures 0.5 mu m or more. This result is in good agreement with scanning electron micrographs. It is believed that the major axis is overestimated due to imaging of liquid-crystal clusters.},
  language  = {en}
}
@article{MellingerFloresSuarezSinghetal.2006,
  author    = {Mellinger, Axel and Flores Su{\´a}rez, Rosaura and Singh, Rajeev and Wegener, Michael and Wirges, Werner and Lang, Sidney B. and Gerhard, Reimund},
  title     = {High-resolution space-charge and polarization tomography with thermal pulses},
  isbn      = {3-8007-2939-3},
  year      = {2006},
  abstract  = {Die Arbeit wurde am 13.03.2006 mit dem "BEST PAPER AWARD" des deutschen IEEE Instrumentation and Measurement (I\&M) Chapter ausgezeichnet.},
  language  = {en}
}
@article{MellingerSinghGerhard2005,
  author    = {Mellinger, Axel and Singh, Rajeev and Gerhard, Reimund},
  title     = {Fast thermal-pulse measurements of space-charge distributions in electret polymers},
  issn      = {0034-6748},
  year      = {2005},
  abstract  = {Space-charge depth profiles in various electret polymers have been measured in both the time and the frequency domain using thermal pulses and waves, respectively. A comparison of the two techniques on corona-charged polytetrafluoroethylene showed that the thermal-pulse method yielded similar results as the thermal-wave technique, but approximately 20-50 times faster. The article discusses sensitivity limitations as well as possible applications, including the real-time monitoring of space-charge decay under UV irradiation. (C) 2005 American Institute of Physics},
  language  = {en}
}
@article{MellingerFruebingPrescheretal.1999,
  author    = {Mellinger, Axel and Fr{\"u}bing, Peter and Prescher, Dietrich and Gerhard, Reimund},
  title     = {Dielectric spectra of a partially fluorinated chromophore / amorphous Teflon AF guest-host system},
  year      = {1999},
  language  = {en}
}