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Keywords
Abouzar, Maryam H. ; Ingebrandt, S. ; Poghossian, Arshak ; Zhang, Y. ; Vu, X. T. ; Moritz, W. ; Schöning, Michael Josef
Schusser, Sebastian ; Poghossian, Arshak ; Bäcker, Matthias ; Krischer, M. ; Leinhos, Marcel ; Wagner, P. ; Schöning, Michael Josef
The characterization of the degradation kinetics of biodegradable polymers is mandatory with regard to their proper application. In the present work, polymer-modified electrolyte–insulator–semiconductor (PMEIS) field-effect sensors have been applied for in-situ monitoring of the pH-dependent degradation kinetics of the commercially available biopolymer poly(d,l-lactic acid) (PDLLA) in buffer solutions from pH 3 to pH 13. PDLLA films of 500 nm thickness were deposited on the surface of an Al–p-Si–SiO2–Ta2O5 structure from a polymer solution by means of spin-coating method. The PMEIS sensor is, in principle, capable to detect any changes in bulk, surface and interface properties of the polymer induced by degradation processes. A faster degradation has been observed for PDLLA films exposed to alkaline solutions (pH 9, pH 11 and pH 13).
Christiaens, P. ; Abouzar, Maryam H. ; Poghossian, Arshak ; Wagner, Torsten ; Bijnens, N. ; Williams, O. A. ; Daenen, M. ; Haenen, K. ; Schöning, Michael Josef ; Wagner, P.
Schöning, Michael Josef ; Abouzar, Maryam H. ; Ingebrandt, Sven ; Platen, Johannes ; Offenhäusser, Andreas ; Poghossian, Arshak
Schusser, Sebastian ; Poghossian, Arshak ; Bäcker, Matthias ; Leinhos, Marcel ; Wagner, Patrick ; Schöning, Michael Josef
In vitro studies of the degradation kinetic of biopolymers are essential for the design and optimization of implantable biomedical devices. In the presented work, a field-effect capacitive sensor has been applied for the real-time and in situ monitoring of degradation processes of biopolymers for the first time. The polymer-covered field-effect sensor is, in principle, capable to detect any changes in bulk, surface and interface properties of the polymer induced by degradation processes. The feasibility of this approach has been experimentally proven by using the commercially available biomedical polymer poly(D,L-lactic acid) (PDLLA) as a model system. PDLLA films of different thicknesses were deposited on the Ta₂O₅-gate surface of the field-effect structure from a polymer solution by means of spin-coating method. The polymer-modified field-effect sensors have been characterized by means of capacitance–voltage and impedance-spectroscopy method. The degradation of the PDLLA was accelerated by changing the degradation medium from neutral (pH 7.2) to alkaline (pH 9) condition, resulting in drastic changes in the capacitance and impedance spectra of the polymer-modified field-effect sensor.
Schusser, Sebastian ; Krischer, M. ; Molin, D. G. M. ; Akker, N. M. S. van den ; Bäcker, Matthias ; Poghossian, Arshak ; Schöning, Michael Josef
A sensor system for investigating (bio)degradationprocesses of polymers is presented. The system utilizes semiconductor field-effect sensors and is capable of monitoring the degradation process in-situ and in real-time. The degradation of the polymer poly(d,l-lactic acid) is exemplarily monitored in solutions with different pH value, pH-buffer solution containing the model enzyme lipase from Rhizomucormiehei and cell-culture medium containing supernatants from stimulated and non-stimulated THP-1-derived macrophages mimicking activation of the immune system.
Gasparyan, F. V. ; Poghossian, Arshak ; Vitusevich, S. A. ; Petrychuk, M. V. ; Sydoruk, V. A. ; Surmalyan, A. V. ; Siqueira, J. R. ; Oliveira, O. N. ; Offenhäusser, A. ; Schöning, Michael Josef