Low-temperature atmospheric pressure plasma deposition of TiO2-based nanocomposite coatings on open-cell polymer foams for photocatalytic water treatment

Uricchio, Antonella; Nadal, Elie; Plujat, Béatrice; Plantard, G.; Massines, Françoise; Fanelli, Fiorenza

doi:10.1016/j.apsusc.2021.150014

Cited by 34 publications

(30 citation statements)

References 72 publications

(192 reference statements)

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“…Plasma activation, TiO 2 -deposition and different gamma-ray doses had only minor alterations to the implant surface chemistry. Similar results were also presented in a similar study [33,67].…”

Section: Chemical Changes Of Implants After Surface Treatments and St...supporting

confidence: 92%

Long-Term In Vivo Response of a Polyurethane Gastric Implant for Treating Gastro-Oesophageal Reflux Diseases: A Comparison of Different Surface Treatments

Haugen

Schneider

Schlicht

et al. 2022

Biomedical Materials & Devices

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Gastro oesophagael reflux disease (GORD) is common in the Western hemisphere. Patients with regurgitated reflux are typically treated with fundoplication surgery. We present a newly designed polyurethane implant which passively aids the sphincter in reducing gastric fluids within the oesophagus. The gastric implant has an open porous inner side which allows for tissue ingrowth from the oesophagus and thus allows for fixation around the sphincter. In addition, a device for minimally invasive surgery of this implant was developed and used in a pig model. The unmodified GORD implant was placed around the pig’s oesophagus with unsatisfactory results, leading to insufficient fixation at the implantation site and scarring tissue leading to dysphagia. In addition, two surface modifications, plasma activation and TiO2 deposition were used to improve the implant’s host tissue response. The biocompatibility effects of the surface treatments and sterilisation method on the implant were investigated in vitro and in vivo. In vitro tests found that the plasma activation and TiO2 deposition have effectively enhanced the surface hydrophilicity and, consequently, the cell response to the implant. In addition, the gamma sterilisation harmed the plasma-activated implant. The plasma activation was more effective than TiO2 deposition as a surface treatment method for improving the tissue response of this implant in vivo. In addition, the in vivo experiment proved tissue ingrowth as deep as 1 mm into the porous structure of the implant. The GORD implants were encapsulated wholly in fibrous tissue; however, the capsule thickness diminished over time. Finally, the TiO2-coated implants showed the poorest histocompatibility, contradictory to the in vitro findings. This study shows that it is possible to produce a plasma-treated porous polyurethane gastric implant that allows for fibrous tissue ingrowth, reduced in vivo encapsulation, and enhanced chemical properties. Graphical Abstract Model of the implant with an inner porous and an outer non-porous surface. The hypothesis was that the porous surface allows for fibroblastic infiltration into the porous structure (A) and fixation by scarring at the point of implantation, the lower oesophageal sphincter (LOS). The outer side is smooth (B), which hinders neighbouring tissue attachments. In addition, a Nitinol ring (C) aids the implant in exerting pressure around the LOS, thus reducing sphincter volume. In addition, this metal ring aids visualisation with, e.g. X-ray or CT during post-therapy follow-ups. The open, flexible design eases the freeing of the ring in a stretched position and placement around the cardia (D-F). The internal diameter of 28 mm prevents stenosis but markedly reinforces the lower oesophagal sphincter. In addition, its size allows for minimally invasive surgery.

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Section: Chemical Changes Of Implants After Surface Treatments and St...supporting

confidence: 92%

Long-Term In Vivo Response of a Polyurethane Gastric Implant for Treating Gastro-Oesophageal Reflux Diseases: A Comparison of Different Surface Treatments

Haugen

Schneider

Schlicht

et al. 2022

Biomedical Materials & Devices

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“…However, to the best of our knowledge, only a few of these reports accounted for the actual photocatalytic performance of the AAAP-plasma-deposited nanocomposite films [ 30 ]. Indeed, Uricchio et al [ 30 ] proposed a coating obtained by spraying an aerosol of an oleate-capped TiO 2 suspension in n-octane onto a substrate formed of polyurethane foam, thus providing not only a clear indication of the suitability of the methods for photocatalytic film deposition but also proving its photocatalytic activity in a simulated sample.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Investigation of Aerosol-Assisted Atmospheric Pressure Plasma Deposited Hybrid TiO2 Containing Nanocomposite Coatings

et al. 2022

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We report on the aerosol-assisted atmospheric-pressure plasma deposition onto a stainless-steel woven mesh of a thin nanocomposite coating based on TiO2 nanoparticles hosted in a hybrid organic–inorganic matrix, starting from nanoparticles dispersed in a mixture of hexamethyldisiloxane and isopropyl alcohol. The stainless-steel mesh was selected as an effective support for the possible future technological application of the coating for photocatalytically assisted water depollution. The prepared coatings were thoroughly investigated from the chemical and morphological points of view and were demonstrated to be photocatalytically active in the degradation of an organic molecule, used as a pollutant model, in water upon UV light irradiation. In order to optimize the photocatalytic performance, different approaches were investigated for the coating’s realization, namely (i) the control of the deposition time and (ii) the application of a postdeposition O2 plasma treatment on the pristine coatings. Both strategies were found to be able to increase the photocatalytic activity, and, remarkably, their combination resulted in a further enhancement of the photoactivity. Indeed, the proposed combined approach allowed a three-fold increase in the kinetic constant of the degradation reaction of the model dye methylene blue with respect to the pristine coating. Interestingly, the chemical and morphological characterizations of all the prepared coatings were able to account for the enhancement of the photocatalytic performance. Indeed, the presence of the TiO2 nanoparticles on the outmost surface of the film confirmed the accessibility of the photocatalytic sites in the nanocomposite and reasonably explained the enhanced photocatalytic performance. In addition, the sustained photoactivity (>5 cycles of use) of the nanocomposites was demonstrated.

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“…For example, nanocomposites were produced using a solution of metal (gold) salts dissolved in a polymerizable solvent (isopropanol) [ 31 ] or colloidal solutions with metal‐oxide (ZnO, TiO 2 ) nanoparticles injected in low‐ and atmospheric‐pressure plasmas. [ 12,32‐36 ]…”

Section: Introductionmentioning

confidence: 99%

“…For example, nanocomposites were produced using a solution of metal (gold) salts dissolved in a polymerizable solvent (isopropanol) [31] or colloidal solutions with metal-oxide (ZnO, TiO 2 ) nanoparticles injected in lowand atmospheric-pressure plasmas. [12,[32][33][34][35][36] In all studies based on aerosols and plasmas reported in the literature, precursors for thin-film deposition are injected in a continuous way. Depending on the substrate temperature, applied power conditions (continuous or pulsed), reactant partial pressure and flow rate, and location of the substrate along the gas flow lines, the socalled "soft plasma polymerization" (SPP) can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Soft polymerization of hexamethyldisiloxane by coupling pulsed direct‐liquid injections with dielectric barrier discharge

Cacot

Carnide

Kahn

et al. 2022

Plasma Processes & Polymers

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This work examines the combination of pulsed direct-liquid injections with dielectric barrier discharge at atmospheric pressure for the deposition of organosilicon coatings using hexamethyldisiloxane (HMDSO) as the precursor and nitrogen as the carrier gas. In such conditions, deposition relies on the charging of micrometer droplets and their transport toward the substrate by the Coulomb force. The thin-film morphology and extent of precursor fragmentation are strongly linked to the amount of energy provided by the filamentary discharge to HMDSO droplets. While cross-linked and smooth coatings were achieved at low energies as in standard gas phase plasma polymers, viscous and droplet-like structured thin films were deposited at higher energies. The latter material is attributed to the soft polymerization of HMDSO droplets related to plasma-droplet interactions.

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Low-temperature atmospheric pressure plasma deposition of TiO2-based nanocomposite coatings on open-cell polymer foams for photocatalytic water treatment

Cited by 34 publications

References 72 publications

Long-Term In Vivo Response of a Polyurethane Gastric Implant for Treating Gastro-Oesophageal Reflux Diseases: A Comparison of Different Surface Treatments

Long-Term In Vivo Response of a Polyurethane Gastric Implant for Treating Gastro-Oesophageal Reflux Diseases: A Comparison of Different Surface Treatments

Photocatalytic Investigation of Aerosol-Assisted Atmospheric Pressure Plasma Deposited Hybrid TiO2 Containing Nanocomposite Coatings

Soft polymerization of hexamethyldisiloxane by coupling pulsed direct‐liquid injections with dielectric barrier discharge

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