Effect of Discharge Gases on Microwave Plasma Reactions of Imidazole on Poly(dimethylsiloxane) Surfaces:  Quantitative ATR FT-IR Spectroscopic Analysis

and, Heung Kim; Urban, Marek W.

doi:10.1021/la970039q

Cited by 23 publications

(13 citation statements)

References 14 publications

(22 reference statements)

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“…It is known that hydrophobicity recovery can be observed for PDMS substrates that have been modified under irradiation with UV/O 3 in a time interval of 2 h. The recovery was explained as being due to the diffusion of nonoxidized low-molar-mass PDMS through cracks in the silica-like surface layer. − Toth et al studied silicone rubber surfaces exposed to radio-frequency (rf) plasma or corona discharges in air. They found that silica-like layers formed on the surface, with a thickness of less than 3 nm, using angle-resolved XPS.…”

Section: Resultsmentioning

confidence: 99%

New Approaches for Bottom-Up Assembly of Tobacco Mosaic Virus-Derived Nucleoprotein Tubes on Defined Patterns on Silica- and Polymer-Based Substrates

Azucena¹,

Eber

Trouillet³

et al. 2012

Langmuir

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The capability of some natural molecular building blocks to self-organize into defined supramolecular architectures is a versatile tool for nanotechnological applications. Their site-selective integration into a technical context, however, still poses a major challenge. RNA-directed self-assembly of tobacco mosaic virus-derived coat protein on immobilized RNA scaffolds presents a possibility to grow nucleoprotein nanotubes in place. Two new methods for their site-selective, bottom-up assembly are introduced. For this purpose, isothiocyanate alkoxysilane was used to activate oxidic surfaces for the covalent immobilization of DNA oligomers, which served as linkers for assembly-directing RNA. Patterned silanization of surfaces was achieved (1) on oxidic surfaces via dip-pen nanolithography and (2) on polymer surfaces (poly(dimethylsiloxane)) via selective oxidization by UV-light irradiation in air. Atomic force microscopy and X-ray photoelectron spectroscopy were used to characterize the surfaces. It is shown for the first time that the combination of the mentioned structuring methods and the isothiocyanate-based chemistry is appropriate (1) for the site-selective immobilization of nucleic acids and, thus, (2) for the formation of viral nanoparticles by bottom-up self-assembly after adding the corresponding coat proteins.

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Section: Resultsmentioning

confidence: 99%

New Approaches for Bottom-Up Assembly of Tobacco Mosaic Virus-Derived Nucleoprotein Tubes on Defined Patterns on Silica- and Polymer-Based Substrates

Azucena¹,

Eber

Trouillet³

et al. 2012

Langmuir

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“…25 Variable angle ATR was employed to determine the volume concentration of newly formed species after each step of the reaction as a function of depth by using Ge (50 Â 20 Â 3 mm) crystals and angles varying from 35°to 60°. Since quantitative ATR-FTIR depth profiling requires knowledge of the extinction coefficient for each of these bands, 26 various concentration standards of heparin were prepared, and plots of the absorbance of the 1620 cm À1 OH bending bands as a function of concentration were generated. The extinction coefficients of the bands due to HP is 6778.6 L/mol-cm, whereas the 1710 cm À1 extinction coefficient of CdO vibrations of COOH groups and 1080 cm À1 of CÀOÀC of PEG were previously determined to be 544.32, and 778.58 L/(mol cm), 27 respectively.…”

Section: ' Experimental Sectionmentioning

confidence: 99%

“…The extinction coefficients of the bands due to HP is 6778.6 L/mol-cm, whereas the 1710 cm À1 extinction coefficient of CdO vibrations of COOH groups and 1080 cm À1 of CÀOÀC of PEG were previously determined to be 544.32, and 778.58 L/(mol cm), 27 respectively. Using a double KramersÀKronig transformation (KKT) and previously developed algorithm for quantitative analysis using ATR-FTIR spectroscopy, 26 concentration levels of COOH groups resulting from the microwave plasma modifications, PEG reactions, and HP attachment were determined.…”

Section: ' Experimental Sectionmentioning

confidence: 99%

Covalent Attachment of Multilayers on Poly(tetrafluoroethylene) Surfaces

Aumsuwan

Wagner

et al. 2011

Langmuir

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These studies demonstrate a new approach of producing multifunctionalized coatings on poly(tetrafluoroethylene) (PTFE) surfaces by covalent attachments of multilayers (CAM) of heparin (HP) and poly(ethylene glycol) (PEG). This process can be universally applied to other covalently bonded species and was facilitated by microwave plasma reactions in the presence of maleic anhydride which, upon ring-opening and hydrolysis, provided covalent attachment of COOH groups to PTFE. These studies showed that alternating layers of PEG and HP can be covalently attached to COOH-PTFE surfaces, and the volume concentration and surface density of PEG and HP on the PTFE surface achieved by the CAM were 7.02-6.04 × 10(-3) g/cm(3) (2.1-1.8 × 10(-7) g/cm(2)) and 9.3-8.7 × 10(-3) g/cm(3) (2.8-2.6 × 10(-7) g/cm(2)), respectively. The CAM process may serve numerous applications when the covalent modification of inert polymeric substrates is required and particularly where the presence of bioactive species for biocompatibility enhancement is desirable.

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“…[48] This is attributed to the condensation of neighboring ÀSiÀ(OMe) 3 groups. According to the literature, [48][49][50] stretching vibrations of C=C and C=N cause the peaks at ñ = 1600 and 1564 cm À1 , respectively. …”

mentioning

confidence: 95%

Development of Ionic Liquids Tethered to Coconut Shell Activated Carbon for Biogas Upgrading in a Packed Bed

et al. 2015

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Ionic liquids (ILs) were prepared in situ successfully on coconut shell activated carbon (AC) granules for biogas upgrading in a packed bed. In biogas upgrading, the saturated CO2 capture capacities of AC‐tethered 1‐butyl‐3‐propylimidazolium bis(trifluoromethylsulfonyl)imide (AC‐[BPIM][Tf2N]) and AC‐tethered 1‐aminoethyl‐3‐propylimidazolium bis(trifluoromethylsulfonyl)imide (AC‐[EPIM‐NH2][Tf2N]) were 2.58 and 2.95 mmol g−1 at 20 °C and 0.5 MPa, respectively. The heat of adsorption was 23–28 kJ mol−1 for AC‐[BPIM]‐based adsorbents and 65–71 kJ mol−1 for AC‐[EPIM‐NH2]‐based ones. As a CO2 concentration of less than 3 % is required for biogas to be used in a vehicle, an adsorption capacity at which 3 % of CO2 is reached in the upgraded gas could be more important. If the flow rate of the inlet gas was 50 mL min−1, the adsorption capacity at which 3 % of CO2 is reached in the upgraded gas was 1.44 mmol g−1 for AC‐[BPIM][Tf2N] and 1.95 mmol g−1 for AC‐[EPIM‐NH2][Tf2N] at 20 °C and 0.2 MPa. The adsorption selectivities of CO2 over CH4 were ∼92 and 95 % for AC‐[BPIM][Tf2N] and AC‐[EPIM‐NH2][Tf2N], respectively. The immobilized ILs exhibited a relatively stable cyclability in a packed bed.

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Effect of Discharge Gases on Microwave Plasma Reactions of Imidazole on Poly(dimethylsiloxane) Surfaces: Quantitative ATR FT-IR Spectroscopic Analysis

Cited by 23 publications

References 14 publications

New Approaches for Bottom-Up Assembly of Tobacco Mosaic Virus-Derived Nucleoprotein Tubes on Defined Patterns on Silica- and Polymer-Based Substrates

New Approaches for Bottom-Up Assembly of Tobacco Mosaic Virus-Derived Nucleoprotein Tubes on Defined Patterns on Silica- and Polymer-Based Substrates

Covalent Attachment of Multilayers on Poly(tetrafluoroethylene) Surfaces

Development of Ionic Liquids Tethered to Coconut Shell Activated Carbon for Biogas Upgrading in a Packed Bed

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