scholarly journals Spatial Period of Laser-Induced Surface Nanoripples on PET Determines Escherichia coli Repellence

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3000
Author(s):  
Anja M. Richter ◽  
Gerda Buchberger ◽  
David Stifter ◽  
Jiri Duchoslav ◽  
Andreas Hertwig ◽  
...  
Keyword(s):  
Bacterial Adhesion ◽  
Surface Oxidation ◽  
Spatial Period ◽  
Periodic Surface ◽  
Bacterial Surface ◽  
E Coli ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Emergence Of Resistance

Bacterial adhesion and biofilm formation on surfaces are associated with persistent microbial contamination, biofouling, and the emergence of resistance, thus, calling for new strategies to impede bacterial surface colonization. Using ns-UV laser treatment (wavelength 248 nm and a pulse duration of 20 ns), laser-induced periodic surface structures (LIPSS) featuring different sub-micrometric periods ranging from ~210 to ~610 nm were processed on commercial poly(ethylene terephthalate) (PET) foils. Bacterial adhesion tests revealed that these nanorippled surfaces exhibit a repellence for E. coli that decisively depends on the spatial periods of the LIPSS with the strongest reduction (~91%) in cell adhesion observed for LIPSS periods of 214 nm. Although chemical and structural analyses indicated a moderate laser-induced surface oxidation, a significant influence on the bacterial adhesion was ruled out. Scanning electron microscopy and additional biofilm studies using a pili-deficient E. coli TG1 strain revealed the role of extracellular appendages in the bacterial repellence observed here.

scholarly journals Role of Surfactants in the Properties of Poly(Ethylene Terephthalate)/Purified Clay Nanocomposites

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1397 ◽  
Author(s):  
Elaine dos Santos ◽  
Marcus Fook ◽  
Oscar Malta ◽  
Suédina de Lima Silva ◽  
Itamara Leite
Keyword(s):  
Clay Nanocomposites ◽  
Phosphonium Salts ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Alkyl Ammonium ◽  
Pet Crystallization

Purified clay was modified with different amounts of alkyl ammonium and phosphonium salts and used as filler in the preparation of PET nanocomposites via melt intercalation. The effect of this type of filler on morphology and thermal and mechanical properties of PET nanocomposites was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analyses (TG), tensile properties, and transmission electron microscopy (TEM). The results showed that the mixture of alkyl ammonium and phosphonium salts favored the production of PET nanocomposites with intercalated and partially exfoliated morphologies with slight improvement in thermal stability. In addition, the incorporation of these organoclays tended to inhibit PET crystallization behavior, which is profitable in the production of transparent bottles.

scholarly journals Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

2012 ◽  
Vol 14 (4) ◽  
pp. 95-99 ◽  
Author(s):  
Justyna Karolczyk ◽  
Sylwia Mozia ◽  
Antoni W. Morawski ◽  
Jacek Przepiórski
Keyword(s):  
Humic Acid ◽  
Water Adsorption ◽  
Ethylene Terephthalate ◽  
Porous Carbons ◽  
Preparation Conditions ◽  
Poly Ethylene Terephthalate ◽  
Magnesium Compounds ◽  
Textural Parameters ◽  
Poly Ethylene

Abstract Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.

scholarly journals IgG bearing covalently bound C3b has enhanced bactericidal activity for Escherichia coli 0111.

1985 ◽  
Vol 162 (3) ◽  
pp. 877-889 ◽  
Author(s):  
K A Joiner ◽  
L F Fries ◽  
M A Schmetz ◽  
M M Frank
Keyword(s):  
Escherichia Coli ◽  
Bactericidal Activity ◽  
Sucrose Density Gradient ◽  
Density Gradient Ultracentrifugation ◽  
Antibody Molecule ◽  
Bacterial Surface ◽  
E Coli ◽  
Serum Killing ◽  
Bactericidal Efficiency

The mechanism was sought by which bactericidal IgG for E. coli 0111 (strain 12015) increases the bactericidal efficiency of C5b-9. IgG did not affect the distribution of C3 deposition on the O-Ag capsule and the outer membrane of 12015, suggesting that bactericidal IgG was not directing complement activation to different sites on the bacterial surface. However, one-fifth of the C3 that was deposited in the presence of IgG attached covalently to the antibody molecule. Covalent complexes between purified C3b and IgG were prepared in order to study the role of C3b-IgG in the bactericidal reaction. 8-10-fold less C3b-IgG than IgG was necessary to sensitize 12015 for serum killing. When aggregates were eliminated from the C3b-IgG and IgG preparations by sucrose density gradient ultracentrifugation, C3b-IgG remained three- to fourfold more effective than IgG on a molecule-for-molecule bound basis in mediating the serum bactericidal reaction. These results suggest that formation of C3b-IgG during the serum bactericidal reaction is critical for killing, and have important implications for the development of effective bactericidal vaccines.

scholarly journals Fluorescent SiO2@Tb3+(PET-TEG)3Phen Hybrids as Nucleating Additive for Enhancement of Crystallinity of PET

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 568 ◽  
Author(s):  
Yanna Zhang ◽  
Yao Wang ◽  
Hao Li ◽  
Xuezhong Gong ◽  
Jixian Liu ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Sio2 Nanoparticles ◽  
Polymer Processing ◽  
Hybrid Polymer ◽  
Inorganic Component ◽  
Hybrid Polymers ◽  
Poly Ethylene Terephthalate ◽  
Multifunctional Additives ◽  
Poly Ethylene

A hybrid polymer of SiO2@Tb3+(poly(ethylene terephthalate)-tetraglycol)3 phenanthroline (SiO2@Tb3+(PET–TEG)3Phen) was synthesized by mixing of inorganic SiO2 nanoparticles with polymeric segments of PET–TEG, whereas PET–TEG was achieved through multi-step functionalization strategy. Tb3+ ions and β-diketonate ligand Phen were added in resulting material. The experimental results demonstrated that it was well blended with PET as a robust additive, and not only promoted the crystallinity, but also possessed excellent luminescence properties. An investigation of the mechanism revealed that the SiO2 nanoparticles functioned as a crystallization promotor; the Tb3+ acted as the fluorescent centre; and the PET–TEG segments played the role of linker and buffer, providing better compatibility of PET matrix with the inorganic component. This work demonstrated that hybrid polymers are appealing as multifunctional additives in the polymer processing and polymer luminescence field.

Sign in / Sign up

Export Citation Format

Share Document