P Favia | Università degli Studi di Bari (original) (raw)

Papers by P Favia

Research paper thumbnail of Plasma Processes and Structuring Procedures on Polymer Surfaces to Control Cell-Adhesion and Morphology

Journal of Applied Biomaterials & Functional Materials, 2004

Introduction Low pressure plasma processes can change chemical composition, surface energy and to... more Introduction Low pressure plasma processes can change chemical composition, surface energy and topography of most biomedical interest substrates in a well-controlled manner. RF (13.56 MHz) glow discharges can be used to modify the chemical composition of different nanostructured and microstructured substrates and to study the effect of topography and chemistry on cell lines (1). This study describes two different plasma processes, developed in our laboratory, used as interesting and novel technologies to pattern substrate surfaces to drive cell adhesion and morphology of eukaryotic cells. In the first process described two different plasma depositions were combined, using physical masks (2), to develop surfaces micro-patterned with cell-adhesive and cell-repulsive domains, which become able to drive cell adhesion, spreading and growth along defined directions. Teflon-like coatings, exhibiting randomly distributed ribbon-like nanofeatures (3) obtained by modulated plasma discharges, ...

Research paper thumbnail of Antimicrobial Activity of Immobilized Lysozyme on Plasma-Treated Polyethylene Films

Journal of Food Protection

In this study we tested the antimicrobial activity of polyethylene films modified by means of pla... more In this study we tested the antimicrobial activity of polyethylene films modified by means of plasma processes that were followed by the chemical immobilization of lysozyme, an antimicrobial enzyme. To chemically immobilize the enzyme in its active form at the surface of polyethylene, substrates that had been plasma treated under different experimental conditions were soaked in lysozyme solutions at different concentrations. The immobilization of the enzyme was checked, and the antimicrobial activity of the films was investigated by observing the death rate of Micrococcus lysodeikticus cells suspended in phosphate buffer in contact with the films. The results clearly indicate that plasma-treated films loaded with lysozyme are active against the selected microorganism. A modified version of the Gompertz equation was used to quantitatively valuate the dependence of the antimicrobial activity of the films under both plasma treatment conditions and lysozyme concentrations.

Research paper thumbnail of The 2017 Plasma Roadmap: Low temperature plasma science and technology

Journal of Physics D: Applied Physics

Journal of Physics D: Applied Physics published the first Plasma Roadmap in 2012 consisting of th... more Journal of Physics D: Applied Physics published the first Plasma Roadmap in 2012 consisting of the individual perspectives of 16 leading experts in the various sub-fields of low temperature plasma science and technology. The 2017 Plasma Roadmap is the first update of a planned series of periodic updates of the Plasma Roadmap. The continuously growing interdisciplinary nature of the low temperature plasma field and its equally broad range of applications are making it increasingly difficult to identify major challenges that encompass all of the many sub-fields and applications. This intellectual diversity is ultimately a strength of the field. The current state of the art for the 19 sub-fields addressed in this roadmap

Research paper thumbnail of Direct Plasma Deposition of Lysozyme-Embedded Bio-Composite Thin Films

Plasma Processes and Polymers, 2015

ABSTRACT Bio-composite coatings, consisting of an organic matrix embedding a bioactive molecule, ... more ABSTRACT Bio-composite coatings, consisting of an organic matrix embedding a bioactive molecule, have been deposited by means of atomizer-assisted atmospheric pressure plasma. Ethylene was chosen as the precursor of the matrix, while the atomizer was fed with a water solution of lysozyme. Coatings chemical composition was investigated by XPS, FTIR and MALDI-TOF spectroscopies, and it has been proved that the one-step inclusion of protein domains in the composite coatings is successful and lysozyme chemical structure is only slightly altered. The amount of embedded lysozyme is as high as 14 μg/cm2 as evaluated from water release test. Finally, the activity of the plasma-embedded protein is close to that of pure lysozyme as verified against Micrococcus lysodeikticus ATCC 4698 through an agar plate diffusion test.

Research paper thumbnail of Micro- and Nanostructuring in Plasma Processes for Biomaterials: Micro- and Nano-Features as Powerful Tools to Address Selective Biological Responses

Advanced Plasma Technology, 2007

Page 1. 13 Micro-and Nanostructuring in Plasma Processes for Biomaterials: Micro-and Nano-feature... more Page 1. 13 Micro-and Nanostructuring in Plasma Processes for Biomaterials: Micro-and Nano-features as Powerful Tools to Address Selective Biological Responses E. Sardella, R. Gristina, R. d'Agostino, and P. Favia An in ...

Research paper thumbnail of Plasma-Deposited Acrylic Acid Coatings on Flat and Nanostructured Substrates for Cell-Culture Experiments

D'AGOSTINO:PLASMA PROCESS O-BK, 2005

... Exp Cell Res 2004; 295: 387–394. [28] Dalby MJ, Riehle MO, Johnstone HJH, Affrossman S, Curti... more ... Exp Cell Res 2004; 295: 387–394. [28] Dalby MJ, Riehle MO, Johnstone HJH, Affrossman S, Curtis ASG; Biomaterials, 2002; 232: 945–2954. [29] Denis FA, Hanarp, Sutherland DS, DufrÞne. ... J. Theor. Biol. 1975; 49: 417. [34] Jewell-Larsen NE, Pan V, Denton DD, Ratner BD. ...

Research paper thumbnail of NH3 Plasma Treatments of PET for Enhancing Aluminum Adhesion

A NH 3 plasma process has been studied for enhancing the adhesion of aluminum coatings on polyeth... more A NH 3 plasma process has been studied for enhancing the adhesion of aluminum coatings on polyethyleneterephtalate (PET) films. According to our peel strength results, NH 3 plasmas increase markedly the adhesion of aluminum on PET compared to O 2 discharges, with a much shorter treatment time. A tentative model of nonhindered growth of Al-coating based on the Lewis basic character of the functionalities grafted by NH 3 plasma is proposed for Al-polymer interactions, and for explaining the various steps in the process. The effects of power input and treatment time on the polymer surface chemistry and on the metal-polymer peel strength have been evaluated. Treatment times as short as 0.1 s at 100 W proved to be the best conditions in NH 3 plasmas, for a significant increase in Al/PET adhesion, while longer treatments have a detrimental effect. This may explain why most authors have not discovered the benefits of NH 3 plasmas for improving the adhesion of metals on PET, and have preferred O 2 or air treatments. The relative basicity of PET grafted with N-containing functionalities has been measured by means of X-ray Photoelectron Spectroscopy (XPS) analysis of samples exposed to vapors of trichloromethane, a Lewis acid molecular probe. The Al/PET adhesion was evaluated by means of a 180 • Peel Test.

Research paper thumbnail of PE-CVD of Hydrophilic-COOH Functionalized Coatings on Electrolyte Gated Field-Effect Transistor Electronic Layers

Plasma Processes and Polymers, 2012

ABSTRACT AbstractA plasma deposition (PE‐CVD) process is proposed to functionalize the surface of... more ABSTRACT AbstractA plasma deposition (PE‐CVD) process is proposed to functionalize the surface of P3HT organic semiconductor with an hydrophilic coating characterized by carboxyl groups. The functionalized P3HT is employed as electronic active layer in an electrolyte gated organic field‐effect transistor (EGOFET). Nanometric coatings were plasma deposited at the surface of P3HT from glow discharges fed with ethylene and acrylic acid vapors. The surface chemical composition of coated P3HT along with its wettability, have been assessed by means of X‐ray photoelectron spectroscopy and water contact angle. Results show that PE‐CVD is a valid approach to functionalize P3HT surfaces with carboxyl groups, leaving negligible adverse effect on the EGOFET performances. Possibly, chemical or biological species could be immobilized on PE‐CVD‐functionalized EGOFETs, opening to further developments in their use as sensors.

Research paper thumbnail of Plasma Treatment of Polymers for Improving Al Adhesion

MRS Proceedings, 1998

PET and Kapton thin films have been plasma processed in order to increase sputtered aluminum adhe... more PET and Kapton thin films have been plasma processed in order to increase sputtered aluminum adhesion. The effect of different plasma feedings, such as NH3, O2, and He, has been evaluated on polymer/metal adhesion and on chemical modifications of polymer surface at different plasma power and treatment time. The chemistry at polymer/metal interface has been studied in order to find the suitable experimental conditions for transferring the plasma process to industrial scale.The role of acid-base reactions in promoting Polymer/Aluminum adhesion has been investigated. Surface composition has been investigated by X-ray Photoelectron Spectroscopy; adhesion measurements have been accomplished by 180° Peel Test.

Research paper thumbnail of Plasma Pretreatments and Treatments on Polytetrafluoroethylene for Reducing the Hydrophobic Recovery

D'AGOSTINO:PLASMA PROCESS O-BK, 2005

Research paper thumbnail of Control of cell adhesion and spreading by spatial microarranged PEO-like and pdAA domains

Surface & Coatings Technology - SURF COAT TECH, 2005

Microstructured surfaces are widely used in cell culture experiments to understand the fundamenta... more Microstructured surfaces are widely used in cell culture experiments to understand the fundamentals of cell-material interactions by a spatial control of cell adhesion and spreading. Recent studies have documented that both substrate chemistry and topography are tightly correlated to cell behaviours. For this reason a wide range of techniques have been explored for obtaining in a simple and cheap way reproducible patterned substrates. This paper describes how to produce micropatterned substrates by a spatial microarrangment of chemically different domains, produced by plasma deposition. Cell-repulsive zones, obtained by plasma deposited PolyethyleneOxide-like (PEO-like) coating, were alternated with cell-adhesive tracks, namely plasma deposited Acrylic Acid (pdAA) films. Time lapse experiments demonstrated that such patterns, suitable to exert chemical and topographical constraints for cell-adhesion, can also support migration of cells inside the produced pattern.

Research paper thumbnail of New PVDF membranes: The effect of plasma surface modification on retention in nanofiltration of aqueous solution containing organic compounds

Water Research, 2007

New nanofiltration membranes were prepared by non-solvent-induced phase inversion from a PVDF/DMF... more New nanofiltration membranes were prepared by non-solvent-induced phase inversion from a PVDF/DMF/water system. The effect of exposure time before coagulation on the membrane characteristics (morphology, thickness, overall porosity, tensile strength) was investigated. PVDF membrane prepared at a fixed exposure time of 45s (PF45) was further plasma surface modified (RF 13.56 MHz) (PF45psm), introducing amino groups on the membrane. The performances of PF45, PF45psm and of a commercial nanofiltration membrane (N30F) were tested in the removal of two dyes from aqueous solution, characterized by different charge and molecular weight (congo red and methylene blue). The observed rejections depended more on the charge of the compound than on their molecular weights and results were optimized for the plasma modified membrane (PF45psm) with respect to unmodified (PF45) and commercial N30F membranes. In particular, methylene blue was retained for 100% by PF45psm with a relative flux of 65% compared to 38% of rejection and 59% of relative flux observed for N30F.

Research paper thumbnail of Deposition of super-hydrophobic fluorocarbon coatings in modulated RF glow discharges

Surface and Coatings Technology, 2003

Research paper thumbnail of Atmospheric pressure plasma deposition of organic films of biomedical interest

Surface and Coatings Technology, 2011

... Permissions & Reprints. Atmospheric pressure plasma deposition of organic films of biomed... more ... Permissions & Reprints. Atmospheric pressure plasma deposition of organic films of biomedical interest. G. Da Ponte a , low asterisk , E-mail The Corresponding Author , E. Sardella b , F. Fanelli a , A. Van Hoeck c , R. d'Agostino a , b , d , S. Paulussen c and P. Favia a , b , d. ...

Research paper thumbnail of Process control for plasma processing of polymers

Surface and Coatings Technology, 2001

PE-CVD processes of a variety of coatings ᎏ fluoropolymers, SiO , PEO-and Ag-PEO-like, ᎐COOH func... more PE-CVD processes of a variety of coatings ᎏ fluoropolymers, SiO , PEO-and Ag-PEO-like, ᎐COOH functional layers ᎏ are x described, as well as plasma treatments aimed to selectively graft ᎐NH groups on polymers, with the use of spectroscopic 2 plasma-and surface-diagnostics parameters of potential use for process transfer and control in industrial applications.

Research paper thumbnail of Immobilization of RGD peptides on stable plasma-deposited acrylic acid coatings for biomedical devices

Surface and Coatings Technology, 2005

Thin coatings were deposited in high fragmentation regimes from RF (13.56 MHz) glow discharges fe... more Thin coatings were deposited in high fragmentation regimes from RF (13.56 MHz) glow discharges fed with acrylic acid vapours. These coatings were characterized by a low surface density of COOH groups and resulted homogeneous and very stable in water. PET coated samples were used for the covalent immobilization of RGD peptide via a bis amine spacer arm, using COOH surface

Research paper thumbnail of Plasma deposition of a-C:H, F thin films from H 2 -C 2 F 6 fed RF glow discharges

Plasma Sources Science and Technology, 1992

ABSTRACT Thin films have been deposited from 0-20% C2F6-H2 fed radiofrequency (RF) glow discharge... more ABSTRACT Thin films have been deposited from 0-20% C2F6-H2 fed radiofrequency (RF) glow discharges in a triode reactor. Deposits contain carbon, hydrogen and fluorine in a variable extent, and can be classified as a-C:H, F materials. The effects of feed composition, substrate temperature and substrate bias on the overall deposition process and on the chemical composition of the films have been studied. Actinometric optical emission spectroscopy has been utilized as a diagnostic tool of the plasma, while the film composition has been investigated by means of electron spectroscopy for chemical analysis. A deposition mechanism is proposed which involves carbon atoms and CH radicals as film precursors, and fluorine atoms as responsible for the material fluorination. The net deposition rate is the result of competition between deposition kinetics and ablation steps, all steps being assisted by ions.

Research paper thumbnail of The role of substrate temperature and bias in the plasma deposition from tetramethylsilane

Plasma Sources Science and Technology, 1992

... and bias in the plasma deposition 1 from tetramethylsilane - Pietro Favia, Ritalba Lamendola ... more ... and bias in the plasma deposition 1 from tetramethylsilane - Pietro Favia, Ritalba Lamendola and Riccardo d'Agostino Dipartimento di Chimica. UniversitA di Bari, Centro di Studio per la Chimica dei Plasmi CNR, Trav. ... 59 Page 3. P. Favia et a/ window Top view glass window I I ...

Research paper thumbnail of Plasma Nanostructuring of Polymers: Different Routes to Superhydrophobicity

Plasma Processes and Polymers, 2009

In this paper, we review different plasma processes developed in our laboratory to obtain nanostr... more In this paper, we review different plasma processes developed in our laboratory to obtain nanostructured superhydrophobic polymer surfaces. All methods consist of a single step and lead to functional materials which combine a fluorinated chemistry with unique surface morphologies. The ...

Research paper thumbnail of Modulated plasma deposition of super hydrophobic fluorinated coatings

APS Meeting Abstracts, 2002

... References [1] V. Panchalingam, B. Poon, HH Huo, CR Savage, RB Timmons, RC Eberhart; J. Bioma... more ... References [1] V. Panchalingam, B. Poon, HH Huo, CR Savage, RB Timmons, RC Eberhart; J. Biomat. ... 12, (2000) 2031, [4] SJ Limb, KKS Lau, DJ Edell, EF Gleason, KK Gleason; Plasmas and Polymers 4, (1999) 21 [5] M. Creatore, F. Palumbo, R. d'Agostino P. Fayet - Surface & ...

Research paper thumbnail of Plasma Processes and Structuring Procedures on Polymer Surfaces to Control Cell-Adhesion and Morphology

Journal of Applied Biomaterials & Functional Materials, 2004

Introduction Low pressure plasma processes can change chemical composition, surface energy and to... more Introduction Low pressure plasma processes can change chemical composition, surface energy and topography of most biomedical interest substrates in a well-controlled manner. RF (13.56 MHz) glow discharges can be used to modify the chemical composition of different nanostructured and microstructured substrates and to study the effect of topography and chemistry on cell lines (1). This study describes two different plasma processes, developed in our laboratory, used as interesting and novel technologies to pattern substrate surfaces to drive cell adhesion and morphology of eukaryotic cells. In the first process described two different plasma depositions were combined, using physical masks (2), to develop surfaces micro-patterned with cell-adhesive and cell-repulsive domains, which become able to drive cell adhesion, spreading and growth along defined directions. Teflon-like coatings, exhibiting randomly distributed ribbon-like nanofeatures (3) obtained by modulated plasma discharges, ...

Research paper thumbnail of Antimicrobial Activity of Immobilized Lysozyme on Plasma-Treated Polyethylene Films

Journal of Food Protection

In this study we tested the antimicrobial activity of polyethylene films modified by means of pla... more In this study we tested the antimicrobial activity of polyethylene films modified by means of plasma processes that were followed by the chemical immobilization of lysozyme, an antimicrobial enzyme. To chemically immobilize the enzyme in its active form at the surface of polyethylene, substrates that had been plasma treated under different experimental conditions were soaked in lysozyme solutions at different concentrations. The immobilization of the enzyme was checked, and the antimicrobial activity of the films was investigated by observing the death rate of Micrococcus lysodeikticus cells suspended in phosphate buffer in contact with the films. The results clearly indicate that plasma-treated films loaded with lysozyme are active against the selected microorganism. A modified version of the Gompertz equation was used to quantitatively valuate the dependence of the antimicrobial activity of the films under both plasma treatment conditions and lysozyme concentrations.

Research paper thumbnail of The 2017 Plasma Roadmap: Low temperature plasma science and technology

Journal of Physics D: Applied Physics

Journal of Physics D: Applied Physics published the first Plasma Roadmap in 2012 consisting of th... more Journal of Physics D: Applied Physics published the first Plasma Roadmap in 2012 consisting of the individual perspectives of 16 leading experts in the various sub-fields of low temperature plasma science and technology. The 2017 Plasma Roadmap is the first update of a planned series of periodic updates of the Plasma Roadmap. The continuously growing interdisciplinary nature of the low temperature plasma field and its equally broad range of applications are making it increasingly difficult to identify major challenges that encompass all of the many sub-fields and applications. This intellectual diversity is ultimately a strength of the field. The current state of the art for the 19 sub-fields addressed in this roadmap

Research paper thumbnail of Direct Plasma Deposition of Lysozyme-Embedded Bio-Composite Thin Films

Plasma Processes and Polymers, 2015

ABSTRACT Bio-composite coatings, consisting of an organic matrix embedding a bioactive molecule, ... more ABSTRACT Bio-composite coatings, consisting of an organic matrix embedding a bioactive molecule, have been deposited by means of atomizer-assisted atmospheric pressure plasma. Ethylene was chosen as the precursor of the matrix, while the atomizer was fed with a water solution of lysozyme. Coatings chemical composition was investigated by XPS, FTIR and MALDI-TOF spectroscopies, and it has been proved that the one-step inclusion of protein domains in the composite coatings is successful and lysozyme chemical structure is only slightly altered. The amount of embedded lysozyme is as high as 14 μg/cm2 as evaluated from water release test. Finally, the activity of the plasma-embedded protein is close to that of pure lysozyme as verified against Micrococcus lysodeikticus ATCC 4698 through an agar plate diffusion test.

Research paper thumbnail of Micro- and Nanostructuring in Plasma Processes for Biomaterials: Micro- and Nano-Features as Powerful Tools to Address Selective Biological Responses

Advanced Plasma Technology, 2007

Page 1. 13 Micro-and Nanostructuring in Plasma Processes for Biomaterials: Micro-and Nano-feature... more Page 1. 13 Micro-and Nanostructuring in Plasma Processes for Biomaterials: Micro-and Nano-features as Powerful Tools to Address Selective Biological Responses E. Sardella, R. Gristina, R. d'Agostino, and P. Favia An in ...

Research paper thumbnail of Plasma-Deposited Acrylic Acid Coatings on Flat and Nanostructured Substrates for Cell-Culture Experiments

D'AGOSTINO:PLASMA PROCESS O-BK, 2005

... Exp Cell Res 2004; 295: 387–394. [28] Dalby MJ, Riehle MO, Johnstone HJH, Affrossman S, Curti... more ... Exp Cell Res 2004; 295: 387–394. [28] Dalby MJ, Riehle MO, Johnstone HJH, Affrossman S, Curtis ASG; Biomaterials, 2002; 232: 945–2954. [29] Denis FA, Hanarp, Sutherland DS, DufrÞne. ... J. Theor. Biol. 1975; 49: 417. [34] Jewell-Larsen NE, Pan V, Denton DD, Ratner BD. ...

Research paper thumbnail of NH3 Plasma Treatments of PET for Enhancing Aluminum Adhesion

A NH 3 plasma process has been studied for enhancing the adhesion of aluminum coatings on polyeth... more A NH 3 plasma process has been studied for enhancing the adhesion of aluminum coatings on polyethyleneterephtalate (PET) films. According to our peel strength results, NH 3 plasmas increase markedly the adhesion of aluminum on PET compared to O 2 discharges, with a much shorter treatment time. A tentative model of nonhindered growth of Al-coating based on the Lewis basic character of the functionalities grafted by NH 3 plasma is proposed for Al-polymer interactions, and for explaining the various steps in the process. The effects of power input and treatment time on the polymer surface chemistry and on the metal-polymer peel strength have been evaluated. Treatment times as short as 0.1 s at 100 W proved to be the best conditions in NH 3 plasmas, for a significant increase in Al/PET adhesion, while longer treatments have a detrimental effect. This may explain why most authors have not discovered the benefits of NH 3 plasmas for improving the adhesion of metals on PET, and have preferred O 2 or air treatments. The relative basicity of PET grafted with N-containing functionalities has been measured by means of X-ray Photoelectron Spectroscopy (XPS) analysis of samples exposed to vapors of trichloromethane, a Lewis acid molecular probe. The Al/PET adhesion was evaluated by means of a 180 • Peel Test.

Research paper thumbnail of PE-CVD of Hydrophilic-COOH Functionalized Coatings on Electrolyte Gated Field-Effect Transistor Electronic Layers

Plasma Processes and Polymers, 2012

ABSTRACT AbstractA plasma deposition (PE‐CVD) process is proposed to functionalize the surface of... more ABSTRACT AbstractA plasma deposition (PE‐CVD) process is proposed to functionalize the surface of P3HT organic semiconductor with an hydrophilic coating characterized by carboxyl groups. The functionalized P3HT is employed as electronic active layer in an electrolyte gated organic field‐effect transistor (EGOFET). Nanometric coatings were plasma deposited at the surface of P3HT from glow discharges fed with ethylene and acrylic acid vapors. The surface chemical composition of coated P3HT along with its wettability, have been assessed by means of X‐ray photoelectron spectroscopy and water contact angle. Results show that PE‐CVD is a valid approach to functionalize P3HT surfaces with carboxyl groups, leaving negligible adverse effect on the EGOFET performances. Possibly, chemical or biological species could be immobilized on PE‐CVD‐functionalized EGOFETs, opening to further developments in their use as sensors.

Research paper thumbnail of Plasma Treatment of Polymers for Improving Al Adhesion

MRS Proceedings, 1998

PET and Kapton thin films have been plasma processed in order to increase sputtered aluminum adhe... more PET and Kapton thin films have been plasma processed in order to increase sputtered aluminum adhesion. The effect of different plasma feedings, such as NH3, O2, and He, has been evaluated on polymer/metal adhesion and on chemical modifications of polymer surface at different plasma power and treatment time. The chemistry at polymer/metal interface has been studied in order to find the suitable experimental conditions for transferring the plasma process to industrial scale.The role of acid-base reactions in promoting Polymer/Aluminum adhesion has been investigated. Surface composition has been investigated by X-ray Photoelectron Spectroscopy; adhesion measurements have been accomplished by 180° Peel Test.

Research paper thumbnail of Plasma Pretreatments and Treatments on Polytetrafluoroethylene for Reducing the Hydrophobic Recovery

D'AGOSTINO:PLASMA PROCESS O-BK, 2005

Research paper thumbnail of Control of cell adhesion and spreading by spatial microarranged PEO-like and pdAA domains

Surface & Coatings Technology - SURF COAT TECH, 2005

Microstructured surfaces are widely used in cell culture experiments to understand the fundamenta... more Microstructured surfaces are widely used in cell culture experiments to understand the fundamentals of cell-material interactions by a spatial control of cell adhesion and spreading. Recent studies have documented that both substrate chemistry and topography are tightly correlated to cell behaviours. For this reason a wide range of techniques have been explored for obtaining in a simple and cheap way reproducible patterned substrates. This paper describes how to produce micropatterned substrates by a spatial microarrangment of chemically different domains, produced by plasma deposition. Cell-repulsive zones, obtained by plasma deposited PolyethyleneOxide-like (PEO-like) coating, were alternated with cell-adhesive tracks, namely plasma deposited Acrylic Acid (pdAA) films. Time lapse experiments demonstrated that such patterns, suitable to exert chemical and topographical constraints for cell-adhesion, can also support migration of cells inside the produced pattern.

Research paper thumbnail of New PVDF membranes: The effect of plasma surface modification on retention in nanofiltration of aqueous solution containing organic compounds

Water Research, 2007

New nanofiltration membranes were prepared by non-solvent-induced phase inversion from a PVDF/DMF... more New nanofiltration membranes were prepared by non-solvent-induced phase inversion from a PVDF/DMF/water system. The effect of exposure time before coagulation on the membrane characteristics (morphology, thickness, overall porosity, tensile strength) was investigated. PVDF membrane prepared at a fixed exposure time of 45s (PF45) was further plasma surface modified (RF 13.56 MHz) (PF45psm), introducing amino groups on the membrane. The performances of PF45, PF45psm and of a commercial nanofiltration membrane (N30F) were tested in the removal of two dyes from aqueous solution, characterized by different charge and molecular weight (congo red and methylene blue). The observed rejections depended more on the charge of the compound than on their molecular weights and results were optimized for the plasma modified membrane (PF45psm) with respect to unmodified (PF45) and commercial N30F membranes. In particular, methylene blue was retained for 100% by PF45psm with a relative flux of 65% compared to 38% of rejection and 59% of relative flux observed for N30F.

Research paper thumbnail of Deposition of super-hydrophobic fluorocarbon coatings in modulated RF glow discharges

Surface and Coatings Technology, 2003

Research paper thumbnail of Atmospheric pressure plasma deposition of organic films of biomedical interest

Surface and Coatings Technology, 2011

... Permissions & Reprints. Atmospheric pressure plasma deposition of organic films of biomed... more ... Permissions & Reprints. Atmospheric pressure plasma deposition of organic films of biomedical interest. G. Da Ponte a , low asterisk , E-mail The Corresponding Author , E. Sardella b , F. Fanelli a , A. Van Hoeck c , R. d'Agostino a , b , d , S. Paulussen c and P. Favia a , b , d. ...

Research paper thumbnail of Process control for plasma processing of polymers

Surface and Coatings Technology, 2001

PE-CVD processes of a variety of coatings ᎏ fluoropolymers, SiO , PEO-and Ag-PEO-like, ᎐COOH func... more PE-CVD processes of a variety of coatings ᎏ fluoropolymers, SiO , PEO-and Ag-PEO-like, ᎐COOH functional layers ᎏ are x described, as well as plasma treatments aimed to selectively graft ᎐NH groups on polymers, with the use of spectroscopic 2 plasma-and surface-diagnostics parameters of potential use for process transfer and control in industrial applications.

Research paper thumbnail of Immobilization of RGD peptides on stable plasma-deposited acrylic acid coatings for biomedical devices

Surface and Coatings Technology, 2005

Thin coatings were deposited in high fragmentation regimes from RF (13.56 MHz) glow discharges fe... more Thin coatings were deposited in high fragmentation regimes from RF (13.56 MHz) glow discharges fed with acrylic acid vapours. These coatings were characterized by a low surface density of COOH groups and resulted homogeneous and very stable in water. PET coated samples were used for the covalent immobilization of RGD peptide via a bis amine spacer arm, using COOH surface

Research paper thumbnail of Plasma deposition of a-C:H, F thin films from H 2 -C 2 F 6 fed RF glow discharges

Plasma Sources Science and Technology, 1992

ABSTRACT Thin films have been deposited from 0-20% C2F6-H2 fed radiofrequency (RF) glow discharge... more ABSTRACT Thin films have been deposited from 0-20% C2F6-H2 fed radiofrequency (RF) glow discharges in a triode reactor. Deposits contain carbon, hydrogen and fluorine in a variable extent, and can be classified as a-C:H, F materials. The effects of feed composition, substrate temperature and substrate bias on the overall deposition process and on the chemical composition of the films have been studied. Actinometric optical emission spectroscopy has been utilized as a diagnostic tool of the plasma, while the film composition has been investigated by means of electron spectroscopy for chemical analysis. A deposition mechanism is proposed which involves carbon atoms and CH radicals as film precursors, and fluorine atoms as responsible for the material fluorination. The net deposition rate is the result of competition between deposition kinetics and ablation steps, all steps being assisted by ions.

Research paper thumbnail of The role of substrate temperature and bias in the plasma deposition from tetramethylsilane

Plasma Sources Science and Technology, 1992

... and bias in the plasma deposition 1 from tetramethylsilane - Pietro Favia, Ritalba Lamendola ... more ... and bias in the plasma deposition 1 from tetramethylsilane - Pietro Favia, Ritalba Lamendola and Riccardo d'Agostino Dipartimento di Chimica. UniversitA di Bari, Centro di Studio per la Chimica dei Plasmi CNR, Trav. ... 59 Page 3. P. Favia et a/ window Top view glass window I I ...

Research paper thumbnail of Plasma Nanostructuring of Polymers: Different Routes to Superhydrophobicity

Plasma Processes and Polymers, 2009

In this paper, we review different plasma processes developed in our laboratory to obtain nanostr... more In this paper, we review different plasma processes developed in our laboratory to obtain nanostructured superhydrophobic polymer surfaces. All methods consist of a single step and lead to functional materials which combine a fluorinated chemistry with unique surface morphologies. The ...

Research paper thumbnail of Modulated plasma deposition of super hydrophobic fluorinated coatings

APS Meeting Abstracts, 2002

... References [1] V. Panchalingam, B. Poon, HH Huo, CR Savage, RB Timmons, RC Eberhart; J. Bioma... more ... References [1] V. Panchalingam, B. Poon, HH Huo, CR Savage, RB Timmons, RC Eberhart; J. Biomat. ... 12, (2000) 2031, [4] SJ Limb, KKS Lau, DJ Edell, EF Gleason, KK Gleason; Plasmas and Polymers 4, (1999) 21 [5] M. Creatore, F. Palumbo, R. d'Agostino P. Fayet - Surface & ...