Preparation, stabilization and characterization of TiO2 on thin polyethylene films (LDPE). Photocatalytic applications

Zhang, Yu; Mielczarski, E.; Mielczarski, J.; Laub, D.; Buffat, PA; Klehm, U.; Albers, Peter; Lee, K.; Kulik, A.; Kiwi‐Minsker, Lioubov; Renken, Albert; Kiwi, J.

doi:10.1016/j.watres.2006.11.020

Cited by 74 publications

(31 citation statements)

References 15 publications

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“…Polyethylenfilme lassen sich in der Regel noch durch Tauchen in eine TiO 2 -Suspension und nachfolgende thermische Behandlung bei Temperaturen bis 180 8C mit einer stabilen, photokatalytisch aktiven Oberfläche versehen. [223] Für viele andere Kunststoffe ist dieses Vorgehen nicht geeignet. In einem neuartigen Verfahren werden die Oberflächen von TiO 2 -NPs zunächst mit einem fluororganischen Silan funktionalisiert.…”

Section: Synthesechemieunclassified

Nanopartikuläre Funktionsmaterialien

2010

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Nanopartikuläre Funktionsmaterialien bieten vielfältige Perspektiven für die fortschreitende Miniaturisierung und die zunehmende Komplexität der technischen Entwicklung. Ebenso tragen Nanopartikel maßgeblich zum ressourcenschonenden Einsatz von Stoffen bei. Neben diesen naheliegenden Aspekten beruht die Bedeutung der Nanopartikel jedoch auf ihren grundsätzlich neuartigen Eigenschaften und Funktionen. Diese reichen von photonischen Kristallen und effizienten Leuchtstoffen, Einzelpartikeln und Dünnschichten für elektronische Speicher und Schaltelemente, magnetischen Flüssigkeiten und hochselektiven Katalysatoren, vielfältigen Möglichkeiten zur Veredlung von Oberflächen, neuartigen Materialien und Konzepten zur Energieumwandlung und ‐speicherung, Kontrastmitteln für die molekularbiologische und medizinische Diagnostik bis hin zu grundsätzlich neuartigen Materialformen und ‐strukturen wie Nanocontainern und Superkristallen. Die Realisierung hochwertiger Nanopartikel erfordert dabei bereits während der Materialsynthese die Berücksichtigung vieler Einflussgrößen, die Partikelkern, Partikeloberflächen, kolloidale Eigenschaften und Partikelabscheidung betreffen. Eine sinnvolle Eigenschaftscharakterisierung und ‐bewertung bedingt dabei die Einbindung vielfältiger Kompetenzen aus unterschiedlichsten Fachgebieten. Dieses Umfeld macht insgesamt Anspruch als auch Reiz für den “Nanowissenschaftler” aus.

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Section: Synthesechemieunclassified

Nanopartikuläre Funktionsmaterialien

2010

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“…Some studies have also report low temperature film preparation using TiO 2 colloids or pre-formed powders on PE-films by immersion, followed by drying <100 • C [34]. However, the non-uniform TiO 2 grain deposition, lack of reproducibility and adhesion makes the evaluation of the compactness estimated by surface porosity and X-ray diffraction (XRD) only qualitative.…”

Section: Introductionmentioning

confidence: 99%

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

Rtimi

Giannakis

Bensimon

et al. 2016

Applied Catalysis B: Environmental

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a b s t r a c tInsight is provided in this study for the effect of the TiO 2 film densification/compactness on polyethylene (PE-TiO 2 ) by sputtering TiO 2 at two very different energy levels. Uniform, adhesive low energy films were prepared by direct current magnetron sputtering (DCMS) and compared with films sputtered at high energy levels by high power impulse magnetron sputtering (HIPIMS). Nano-particulate TiO 2 films sputtered by HPIMS presented sizes of ∼10.2 nm compared to films sputtered by DCMS with TiO 2 sizes of ∼16.5 nm as determined by X-ray diffraction (XRD). The E. coli inactivation kinetics was three times faster for the samples sputtered by HIPIMS compared to their DCMS counterparts. This is an unexpected finding since the DCMS presenting larger TiO 2 sized nanoparticles released a higher amount of Ti-ions compared to the HIPIMS samples as monitored by inductively coupled plasma mass-spectrometry (ICP-MS). The Ti-ions released do not seem to react through an oligodynamic effect but diffuse through the less compact TiO 2 sputtered by DCMS. The faster bacterial inactivation kinetics observed by the HIPIMS sputtered samples can be understood in terms of the complete of Ti 4+ /Ti 3+ redox conversion during bacterial inactivation detected by X-ray photo-electron spectroscopy (XPS) compared to the smaller Ti 4+ /Ti 3+ effect observed in the DCMS-samples. A higher optical density was detected for the HIPIMS sputtered samples by diffuse reflectance spectroscopy (DRS). Evidence is presented for the shift in surface potential and local pH during bacterial inactivation under aerobic and anaerobic conditions. A reaction mechanism is suggested based on the findings described in this study. The sputtered films present the potential to hinder biofilm formation on flexible thin polymers/textiles widely used in hospitals and health facilities.

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“…Polyethylene has excellent electrical properties making it widely being used as insulator. The low-density polyethylene consists of highly branched low crystalline units used with the formula (CH 2 CH 2 ) n [5]. Due to its high cross linking yield and low degradation, polyethylene (PE) is a material commonly used for the radiation processing of items such as heat shrinkable tubes and films [3].…”

Section: Introductionmentioning

confidence: 99%

Wear Behavior of Basalt Filled Low Density Polyethylene Composites

2011

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The friction and wear performance of pure LDPE and 10%, 30%, 50% and 70% basalt filled (by wt) LDPE composite were comparatively evaluated under dry sliding conditions. Wear tests were carried out at room temperature under 5, 10 and 20N loads and at 0.5, 1.0 and 1.5 m/s sliding speeds. The coefficients of friction of the composites were significantly influenced with increase in basalt content. Friction coefficient of the LDPE was getting decreased from 0.51 to 0.13 with increase in basalt content, depending on applied loads and sliding speeds. The results show that the wear rates for pure LDPE and basalt filled composites increase with increasing loads and sliding speeds. The wear rates of the basalt filled composites were significantly affected from the basalt content. Wear rates of the LDPE was decreased from 2.596×10 −3 to 6.8×10 −5 mm 3 /m with increase in basalt content, depending on applied loads and sliding speeds.

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Preparation, stabilization and characterization of TiO2 on thin polyethylene films (LDPE). Photocatalytic applications

Cited by 74 publications

References 15 publications

Nanopartikuläre Funktionsmaterialien

Nanopartikuläre Funktionsmaterialien

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

Wear Behavior of Basalt Filled Low Density Polyethylene Composites

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