Diagnostics of SiOx‐Containing Layers Deposited on Powder Particles by Dielectric Barrier Discharge

Hähnel, Marcel; Brüser, Volker; Kersten, Holger

doi:10.1002/ppap.200700015

Cited by 39 publications

(20 citation statements)

References 30 publications

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“…For the treatment of cells with DBD plasma, 1×10 6 cells were plated on 60 mm diameter Petri dishes in 4 ml of RPMI 1640, 8% FCS. The cells were treated in suspension with surface DBD plasma and air as process gas (DBD/air plasma), based on a procedure described elsewhere (Hähnel et al, 2007, 2010; Oehmigen et al, 2010). A schematic representation of the surface DBD is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Surface molecules on HaCaT keratinocytes after interaction with non‐thermal atmospheric pressure plasma

Haertel

Hähnel

Blackert

et al. 2012

Cell Biology International

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Non-thermal atmospheric-pressure plasmas have been developed that will be used in future for several purposes, e.g. medicine. Living tissues and cells are at the focus of plasma treatment, e.g. to improve wound healing, or induce apoptosis and growth arrest in tumour cells. Detailed investigations of plasma-cell interactions are needed. Cell surface adhesion molecules as integrins, cadherins or the EGFR (epidermal growth factor receptor) are of importance in wound healing and also for development of cancer metastasis. This study has focused on measurement of cell surface molecules on human HaCaT keratinocytes (human adult low calcium temperature keratinocytes) promoting adhesion, migration and proliferation as one important feature of plasma-cell interactions. HaCaT keratinocytes were treated with plasma by a surface dielectric barrier discharge in air. Cell surface molecules and induction of intracellular ROS (reactive oxygen species) were analysed by flow cytometry 24 h after plasma treatment. Besides a reduction of cell viability a significant down-regulation of E-cadherin and the EGFR expression occurred. The influence on α2- and β1-integrins was less pronounced, and expression of ICAM-1 (intercellular adhesion molecule 1) was unaffected. The extent of effects depended on the exposure time of cells to the plasma and the treatment regimen. Intracellular level of ROS detected by the fluorescent dye H2DCFDA (2',7'-dichlorodihydrofluorescein diacetate) increased by plasma treatment, but it was neither dependent on the treatment time nor related to the different treatment regimens. Two-dimensional cultures of HaCaT keratinocytes appear to be a suitable method of investigating plasma-cell interactions.

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Section: Methodsmentioning

confidence: 99%

Surface molecules on HaCaT keratinocytes after interaction with non‐thermal atmospheric pressure plasma

Haertel

Hähnel

Blackert

et al. 2012

Cell Biology International

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“…The cells were treated in suspension with surface DBD plasma at atmospheric pressure and air or argon as process gas based on a setup described elsewhere (Hähnel et al 2007Oehmigen et al 2010). A schematic of the surface DBD is shown in Fig.…”

Section: Treatment Of Mononuclear Cells With Dielectric Barrier Dischmentioning

confidence: 99%

Differential sensitivity of lymphocyte subpopulations to non-thermal atmospheric-pressure plasma

et al. 2012

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“…Typical precursors for plasma enhanced chemical vapour deposition (PECVD) are, e.g. silane [1], hexamethyldisiloxane (HMDSO) [2,3], and aluminium tri-isopropoxide (ATI). In contrast to silicon-based precursors, which have been widely studied in plasmas, less work was done on the usage of aluminium-based precursors [4].…”

Section: Introductionmentioning

confidence: 99%

On the Plasma Chemistry of an RF Discharge Containing Aluminium Tri‐Isopropoxide Studied by FTIR Spectroscopy

Hübner¹,

Fröhlich²,

Tawidian³

et al. 2014

Contrib. Plasma Phys.

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International audienceIn Ar and Ar/N2 radio frequency (RF) discharges with admixtures of aluminium tri-isopropoxide (ATI) the fragmentation of this metal-organic precursor was studied by means of Fourier Transform Infrared (FTIR) spectroscopy using an optical long path cell providing an optical length of l= 17.2 m. The experiments were performed in an asymmetric capacitively coupled process plasma at a frequency of f= 13.56 MHz and at pressure values in the range of p= 1 - 10.5 Pa. The discharge power was chosen between P= 10 - 100 W. Using FTIR spectroscopy the evolution of the concentrations of ATI and of six stable molecules, CH4, C2H2, C2H4, C2H6, CO and HCN, was monitored under flowing conditions at gas flows of Φtotal= 0.5 - 14.5 sccm in the discharge. The concentrations of the reaction products were measured to be between 2 x 1012 molecules cm−3 as e.g. found for C2H4 and C2H6, and 5 x 1013 molecules cm−3, as e.g. in the case of CO. In the plasma a complete dissociation of the precursor ATI was found at a power value of about P= 80 W independent on the admixture of Ar or N2. The fragmentation efficiency (FE) of the reaction products which originate from the ATI molecules ranges between 0.2 and 4 x 1016 molecules J−1 while the fragmentation rate (FR) reached up to 2.5 x 1018 molecules s−1. The multi component detection ability of the spectrometer served to analyse the carbon balance of the by-product formation. For all experiments, the carbon balance never exceeded 25%. Therefore, in the plasmas the majority of the provided carbon is most likely deposited at the reactor walls or forms dust particles or higher molecular CxHy. The conversion efficiencies (CE) of the produced molecular species ranges between 0.1 x 1015 molecules J−1 for C2H4 and 5 x 1015 molecules J−1 for C2H6 depending on the discharge conditions of the RF plasma

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Diagnostics of SiO_x‐Containing Layers Deposited on Powder Particles by Dielectric Barrier Discharge

Cited by 39 publications

References 30 publications

Surface molecules on HaCaT keratinocytes after interaction with non‐thermal atmospheric pressure plasma

Surface molecules on HaCaT keratinocytes after interaction with non‐thermal atmospheric pressure plasma

Differential sensitivity of lymphocyte subpopulations to non-thermal atmospheric-pressure plasma

On the Plasma Chemistry of an RF Discharge Containing Aluminium Tri‐Isopropoxide Studied by FTIR Spectroscopy

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