TY - JOUR A1 - Safinia, L. A1 - Dantan, Nathalie A1 - Höhse, Marek A1 - Mantalaris, A. A1 - Bismarck, A. T1 - Towards a methodology for the effective surface modification of porous polymer scaffolds N2 - A novel low-pressure radio-frequency plasma treatment protocol was developed to achieve the effective through-thickness surface modification of large porous poly (d,l-lactide) (PDLLA) polymer scaffolds using air or water: ammonia plasma treatments. Polymer films were modified as controls. Scanning electron micrographs and maximum bubble point measurements demonstrated that the PDLLA foams have the high porosity, void fraction and interconnected pores required for use as tissue engineering scaffolds. The polymer surface of the virgin polymer does contain acidic functional groups but is hydrophobic. Following exposure to air or water: ammonia plasma, an increased number of polar functional groups and improved wetting behaviour, i.e. hydrophilicity, of wet surfaces was detected. The number of polar surface functional groups increased (hence the decrease in water contact angles) with increasing exposure time to plasma. The change in surface composition and wettablility of wet polymer constructs was characterised by zeta potential and contact angle measurements. The hydrophobic recovery of the treated PDLLA polymer surfaces was also studied. Storage of the treated polymer constructs in ambient air caused an appreciable hydrophobic recovery, whereas in water only partial hydrophobic recovery occurred. However, in both cases the initial surface characteristics decay as function of time. KW - Scaffold KW - Polyactic acid KW - Plasma KW - Surface modification KW - Contact angle KW - Wettability hydrophilicity PY - 2005 DO - https://doi.org/10.1016/j.biomaterials.2005.05.078 SN - 0142-9612 VL - 26 IS - 36 SP - 7537 EP - 7547 PB - Elsevier CY - Oxford AN - OPUS4-11487 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Dantan, Nathalie A1 - Höhse, Marek A1 - Karasyov, A.A. A1 - Wolfbeis, Otto S. ED - Fischerauer, G. T1 - Entwicklung einer pH-Optode zur Früherkennung korrsoionsgefährdender Zustände in Stahlbeton T2 - XX. Messtechnisches Symposium des Arbeitskreises der Hochschullehrer für Messtechnik e.V. CY - Bayreuth, Deutschland DA - 2006-10-05 KW - Korrosion KW - Stahlbeton KW - Monitoring KW - pH KW - Faseroptischer Sensor PY - 2006 SN - 3-8322-5419-6 SP - 93 EP - 103 PB - Shaker CY - Aachen AN - OPUS4-13930 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dantan, Nathalie A1 - Höhse, Marek A1 - Karasyov, A.A. A1 - Wolfbeis, Otto S. T1 - Entwicklung eines optischen pH-Sensors zur Früherkennung korrosionsgefährdender Zustände in Stahlbeton KW - Korrosion KW - Stahlbeton KW - Monitoring KW - pH-Wert KW - Faseroptik KW - Sensorik KW - Corrosion KW - Steel-reinforced concrete KW - pH value KW - Fiber optic sensor PY - 2007 SN - 0340-837X SN - 0178-2312 SN - 0171-8096 VL - 74 IS - 4 SP - 211 EP - 216 PB - Oldenbourg CY - München AN - OPUS4-14971 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Habel, Wolfgang A1 - Buchholz, Uwe A1 - Heidmann, G. A1 - Höhse, Marek A1 - Lothongkam, Chaiyaporn T1 - Fibre-optic sensors for early damage detection in plastic insulations of high-voltage facilities N2 - Fibre-optic sensors (FOS) have great potential as online damage detectors when integrated in HV accessories. Among their well-known use as temperature and strain sensors, there are some more opportunities of use, e. g. they can intimately be embedded in polymeric insulations of HV cable terminations and joints to detect and monitor partial discharges right at the location of their origin. Two FOS types for early PD detection were investigated: an embeddable fibre-optic acoustic sensor to measure acoustlc waves in polymeric insulations generated by PDs, and a fluorescent optical fibre to detect first optical effects during ionization processes in the insulation material. The paper descrlbes these methods, related monitoring Problems and shows first test results. T2 - ISH 2011 - 17th International symposium on high voltage engineering CY - Hannover, Germany DA - 22.08.2011 KW - Fibre optic sensors KW - Monitoring KW - Materials behavior KW - Early shrinkage of cement paste PY - 2011 SN - 978-3-8007-3364-4 SP - 2070 EP - 2075 PB - VDE Verlag GmbH AN - OPUS4-24270 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - Completing the analytical picture - Combing µ-LIBS and µ-Raman T2 - Tag der Chemie CY - Potsdam, Germany DA - 2009-06-04 PY - 2009 AN - OPUS4-19302 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - Combining LIBS and Raman- Marrying Elemental and Molecular Information for Prozess Analysis T2 - 4. Kolloquium des AK Prozessanalytik der GDCh CY - Basel, Switzerland DA - 2008-11-17 PY - 2008 AN - OPUS4-18376 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - Completing the Analytical Picture - Combining LIBS and Raman T2 - ANAKON CY - Berlin, Germany DA - 2009-03-17 PY - 2009 AN - OPUS4-19210 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - Novel Versatile LIBS-Raman Echekke Spectrometer for Elemental and Molecular Analysis of Solids T2 - LIBS 2008 CY - Berlin, Germany DA - 2008-09-22 PY - 2008 AN - OPUS4-18488 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - LIBS and Raman - together at last T2 - ICORS 2008 CY - London, England DA - 2008-08-17 PY - 2008 AN - OPUS4-18489 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - Laser induzierte Plasma Spektroskopie mit diodengepumpten Festkörper-Lasern T2 - Berliner Chemie Symposium CY - Berlin, Germany DA - 2011-04-07 PY - 2011 AN - OPUS4-24882 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Höhse, Marek T1 - Diode Pumped Solid state Lasers: Portable Lasers with the Performance of Double Pulse LIBS T2 - LIBS 2010 CY - Memphis, TN, USA DA - 2010-09-13 PY - 2010 AN - OPUS4-22913 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -