On the Application of Gas Discharge Plasmas for the Immobilization of Bioactive Molecules for Biomedical and Bioengineering Applications

Hempel, F.

doi:10.5772/19043

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…Because amino-functionalized polymer coatings have already numerous applications in biomedicine and bioengineering, for instance, for immobilization of biologically active molecules, such as peptides or proteins at titanium implant materials, coating procedures are already well-established techniques, , among them, plasma-enhanced polymerization and deposition of poly(allylamine), PPAAm, is one of the most successful procedures because the resulting films were found to exhibit excellent adhesion and high stability in aqueous solutions, with high densities of amino groups. PPAAm deposition processes typically involve low-pressure pulsed radio frequency or microwave plasma-enhanced chemical vapor deposition (PECVD) methods, but also by plasma-enhanced DC magnetron sputtering deposition (PMD). − Technologies based on plasma methods are increasingly applied in materials synthesis because in a plasma environment, unique nonequilibrium states of reactive species are present, opening up novel routes for surface modification and providing new opportunities in materials synthesis that can often not be obtained with conventional methods, producing large-scale uniform coatings with strong adhesion of the deposited films …”

Section: Introductionmentioning

confidence: 99%

Plasma-Enhanced Synthesis of Poly(allylamine)-Encapsulated Ruthenium Dye-Sensitized Titania Photocatalysts

et al. 2013

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Photocatalysis for sustainable hydrogen production from water is becoming one of the core challenges for an efficient conversion of solar energy into a clean and renewable fuel, enabling the growth of a carbon-free hydrogen economy. In dye-sensitized TiO2, performances were obtained to be unstable over time due to weak covalent bonding of the molecule at the surface leading to detachment of the dye from the TiO2 surface and dye self-aggregation, with recombination of charge carriers at the dye/TiO2 interface being the second major factor for efficiency losses. Our strategy for improvement of the stability of the dye/TiO2 catalyst is the encapsulation of the assembly by a plasma-polymerized allylamine layer, providing a chemically and mechanically stable nanoconfinement of the dye in close proximity of the titania surface. The TiO2-layer was synthesized by a plasma-enhanced DC magnetron sputtering process on FTO substrates, resulting in homogeneous porous semiconductor layers. The stability of the PPAAm layer on the sputtered TiO2-layer as well as catalyst performance with regard to impairment of the charge transfer between the photoactive sites and the electrolyte was investigated; further XPS, electron microscopy, and UV/vis spectroscopy, as well as photoelectrochemical studies, were carried out for characterization of the new catalyst structure.

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Section: Introductionmentioning

confidence: 99%

Plasma-Enhanced Synthesis of Poly(allylamine)-Encapsulated Ruthenium Dye-Sensitized Titania Photocatalysts

et al. 2013

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“…Spectroscopic measurements that were conducted after processing in an Ar/O 2 microwave-induced plasma revealed the presence of several argon and oxygen species [39], such as radicals, atoms, and ions. They interacted with the polymer surfaces, inducing chemical reactions and forming polar hydrophilic O-containing functional groups in the uppermost layer of the polymers [40,41].…”

Section: Plasma Treatmentmentioning

confidence: 99%

The Optimization of Dispersion and Application Techniques for Nanocarbon-Doped Mixed Matrix Gas Separation Membranes

et al. 2022

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In this work, supported cellulose acetate (CA) mixed matrix membranes (MMMs) were prepared and studied concerning their gas separation behaviors. The dispersion of carbon nanotube fillers were studied as a factor of polymer and filler concentrations using the mixing methods of the rotor–stator system (RS) and the three-roll-mill system (TRM). Compared to the dispersion quality achieved by RS, samples prepared using the TRM seem to have slightly bigger, but fewer and more homogenously distributed, agglomerates. The green γ-butyrolactone (GBL) was chosen as a polyimide (PI) polymer-solvent, whereas diacetone alcohol (DAA) was used for preparing the CA solutions. The coating of the thin CA separation layer was applied using a spin coater. For coating on the PP carriers, a short parameter study was conducted regarding the plasma treatment to affect the wettability, the coating speed, and the volume of dispersion that was applied to the carrier. As predicted by the parameter study, the amount of dispersion that remained on the carriers decreased with an increasing rotational speed during the spin coating process. The dry separation layer thickness was varied between about 1.4 and 4.7 μm. Electrically conductive additives in a non-conductive matrix showed a steeply increasing electrical conductivity after passing the so-called percolation threshold. This was used to evaluate the agglomeration behavior in suspension and in the applied layer. Gas permeation tests were performed using a constant volume apparatus at feed pressures of 5, 10, and 15 bar. The highest calculated CO2/N2 selectivity (ideal), 21, was achieved for the CA membrane and corresponded to a CO2 permeability of 49.6 Barrer.

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“…Plasma can also be used to clean surfaces of various materials. Traditional solvent-based chemical treatments cannot activate or functionalize surfaces in the same manner as plasma does. − Plasma offers a wide range of applications due to the rapid chemical reactions that occur more selectively at lower temperatures or voltages than without plasma. Environmental applications of plasmas include air pollution treatment, wastewater and drinking water purification, and solid waste thermal disposal.…”

Section: Introductionmentioning

confidence: 99%

Investigations into Plasma-Mediated Decomposition of Organoiodide Species as a Pretreatment for Mitigation of Radioiodine Emissions

Balumuru

Stanford

Raja

et al. 2022

Ind. Eng. Chem. Res.

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A plasma-mediated pretreatment step is proposed to decompose methyl iodide (CH 3 I) for facilitating the capture of the iodine radioisotopes present in off-gas streams from used nuclear fuel reprocessing operations. Simulated CH 3 I gas streams were exposed to dielectric barrier discharge (DBD) plasma in a quartz glass continuous-flow reactor using copper electrodes. The kinetics of decomposition of CH 3 I in nitrogen was investigated by varying the applied voltage, inlet concentration, and residence time. The rate of decomposition was proportional to CH 3 I concentration and increased as the applied potential was increased. This effect was incorporated in the kinetics through the dependence of the rate constant on the applied electric field. Decomposition of CH 3 I was not affected by moisture, and the DBD pretreatment is likely to be similarly effective in an air environment as well; however, the results were confounded by a plasma-mediated reaction between nitrogen and oxygen.

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On the Application of Gas Discharge Plasmas for the Immobilization of Bioactive Molecules for Biomedical and Bioengineering Applications

Cited by 4 publications

References 45 publications

Plasma-Enhanced Synthesis of Poly(allylamine)-Encapsulated Ruthenium Dye-Sensitized Titania Photocatalysts

Plasma-Enhanced Synthesis of Poly(allylamine)-Encapsulated Ruthenium Dye-Sensitized Titania Photocatalysts

The Optimization of Dispersion and Application Techniques for Nanocarbon-Doped Mixed Matrix Gas Separation Membranes

Investigations into Plasma-Mediated Decomposition of Organoiodide Species as a Pretreatment for Mitigation of Radioiodine Emissions

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