scholarly journals Ultrasmall, Ligand-Free Ag Nanoparticles with High Antibacterial Activity Prepared by Pulsed Laser Ablation in Liquid

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
László Kőrösi ◽  
Marina Rodio ◽  
Dora Dömötör ◽  
Tamás Kovács ◽  
Szilvia Papp ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Laser Ablation ◽  
Bacterial Resistance ◽  
Processing System ◽  
Picosecond Laser ◽  
Antimicrobial Activities ◽  
Ag Nps ◽  
Laser Ablation In Liquid ◽  
Vis Spectroscopy ◽  
Ligand Free

Since ancient times, silver and its compounds have been known to have a broad spectrum of antimicrobial activities for bacteria, fungi, and viruses. Due to the increasing bacterial resistance to classic antibiotics, the investigations of Ag NPs have increased. Herein, we present the preparation of ligand-free Ag NPs with 3 and 20 nm sizes by applying picosecond laser ablation in liquid at 355 and 1065 nm. Our laser processing system allows a high control on particle sizes. The produced nanoparticles were characterized by means of transmission electron microscopy, UV-Vis spectroscopy, and X-ray diffraction. The size effect on the antibacterial activity of Ag NPs was tested againstE. coliandS. aureus. The growth curves of bacteria were monitored at 0–5 mg/L of Ag NPs by a multimode microplate reader. The size effects as well as the concentration of Ag NPs on their antibacterial activity are discussed.

Ligand-free gold–silver nanoparticle alloy polymer composites generated by picosecond laser ablation in liquid monomer

2012 ◽  
Vol 110 (2) ◽  
pp. 343-350 ◽  
Author(s):  
Ana Menéndez-Manjón ◽  
Andreas Schwenke ◽  
Timo Steinke ◽  
Matthias Meyer ◽  
Ulrich Giese ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Polymer Composites ◽  
Silver Nanoparticle ◽  
Picosecond Laser ◽  
Laser Ablation In Liquid ◽  
Free Gold ◽  
Gold Silver ◽  
Ligand Free

scholarly journals Fabrication of hybrid nanocomposite scaffolds by incorporating ligand-free hydroxyapatite nanoparticles into biodegradable polymer scaffolds and release studies

2015 ◽  
Vol 6 ◽  
pp. 2217-2223 ◽  
Author(s):  
Balazs Farkas ◽  
Marina Rodio ◽  
Ilaria Romano ◽  
Alberto Diaspro ◽  
Romuald Intartaglia ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Ablation ◽  
Hydroxyapatite Nanoparticles ◽  
Free Standing ◽  
Laser Ablation In Liquid ◽  
Hybrid Thin Film ◽  
Liquid Polymer ◽  
Ligand Free ◽  
Poly Propylene

We report on the optical fabrication approach of preparing free-standing composite thin films of hydroxyapatite (HA) and biodegradable polymers by combining pulsed laser ablation in liquid and mask-projection excimer laser stereolithography (MPExSL). Ligand-free HA nanoparticles were prepared by ultrafast laser ablation of a HA target in a solvent, and then the nanoparticles were dispersed into the liquid polymer resin prior to the photocuring process using MPExSL. The resin is poly(propylene fumarate) (PPF), a photo-polymerizable, biodegradable material. The polymer is blended with diethyl fumarate in 7:3 w/w to adjust the resin viscosity. The evaluation of the structural and mechanical properties of the fabricated hybrid thin film was performed by means of SEM and nanoindentation, respectively, while the chemical and degradation studies were conducted through thermogravimetric analysis, and FTIR. The photocuring efficiency was found to be dependent on the nanoparticle concentration. The MPExSL process yielded PPF thin films with a stable and homogenous dispersion of the embedded HA nanoparticles. Here, it was not possible to tune the stiffness and hardness of the scaffolds by varying the laser parameters, although this was observed for regular PPF scaffolds. Finally, the gradual release of the hydroxyapatite nanoparticles over thin film biodegradation is reported.

scholarly journals Starch-Capped Silver Nanoparticles Impregnated into Propylamine-Substituted PVA Films with Improved Antibacterial and Mechanical Properties for Wound-Bandage Applications

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2112 ◽  
Author(s):  
Mudassir Iqbal ◽  
Hadia Zafar ◽  
Azhar Mahmood ◽  
Muhammad Bilal Khan Niazi ◽  
Muhammad Waqar Aslam
Keyword(s):  
Silver Nanoparticles ◽  
Wound Dressing ◽  
Antibacterial Properties ◽  
Antimicrobial Activities ◽  
Sem Analysis ◽  
Ag Nps ◽  
Blend Film ◽  
Physical Strength ◽  
Vis Spectroscopy ◽  
Average Size

This research endeavor aims to develop polyvinyl alcohol (PVA) based films capable of blends with silver nanoparticles (Ag–NPs) for improved antibacterial properties and good mechanical strength to widen its scope in the field of wound dressing and bandages. This study reports synthesis of propylamine-substituted PVA (PA–PVA), Ag–NPs via chemical and green methods (starch capping) and their blended films in various proportions. Employment of starch-capped Ag–NPs as nanofillers into PVA films has substantially improved the above-mentioned properties in the ensuing nanocomposites. Synthesis of PA–PVA, starch-capped Ag–NPs and blended films were well corroborated with UV/Vis spectroscopy, FTIR, NMR, XRD and SEM analysis. Synthesized Ag–NPs were of particle shape and have an average size 20 nm and 40 nm via green and chemical synthesis, respectively. The successful blending of Ag–NPs was yielded up to five weight per weight into PA–PVA film as beyond this self-agglomeration of Ag–NPs was observed. Antibacterial assay has shown good antimicrobial activities by five weight per weight Ag–NPs(G)-encapsulated into PA–PVA blended film, i.e., 13 mm zone inhibition against Escherichia coli and 11 mm zone inhibition against Staphylococcus aureus. Physical strength was measured in the terms of young’s modulus via tensile stress–strain curves of blended films. The five weight per weight Ag–NPs(G)/PA–PVA blend film showed maximum tensile strength 168.2 MPa while three weight per weight Ag–NPs(G)/PVA blend film showed highest values for ultimate strain 297.0%. Ag–NPs embedment into PA–PVA was resulted in strong and ductile film blend than pristine PA–PVA film due to an increase in hydrogen bonding. These good results of five weight per weight Ag–NPs(G)/PA–PVA product make it a potent candidate for wound dressing application in physically active body areas.

scholarly journals Antibacterial Activity of TiO2 Nanoparticles Prepared by One-Step Laser Ablation in Liquid

2021 ◽  
Vol 11 (10) ◽  
pp. 4623
Author(s):  
Khawla S. Khashan ◽  
Ghassan M. Sulaiman ◽  
Farah A. Abdulameer ◽  
Salim Albukhaty ◽  
Mohammed A. Ibrahem ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Laser Ablation ◽  
Size Distribution ◽  
Diffusion Method ◽  
Laser Ablation In Liquid ◽  
Visible Absorption ◽  
Tio2 Nps ◽  
E Coli ◽  
Uv Visible ◽  
Xrd Patterns

Laser ablation in liquid was utilized to prepare a TiO2 NP suspension in in deionized distilled water using Q-switch Nd: YAG laser at various laser energies and ablation times. The samples were characterized using UV–visible absorption spectra obtained with a UV–visible spectrophotometer (UV-Vis,) Fourier transform infrared (FTIR), X-ray diffraction (XRD), and transmission electron microscope (TEM). While, UV-Vis spectra showed the characteristic band-to-band absorption peak of TiO2 NPs in the UV range. FTIR analysis showed the existence of O-Ti-O bond. XRD patterns indicated the presence of (101) and (112) plane crystalline phases of TiO2. TEM images showed a spherical-like structure of TiO2 NPs with various size distributions depending on the ablation period. It was also found that there is a relationship between laser ablation time and TiO2 NP size distribution, where longer ablation times led to the smaller size distribution. The antibacterial activity of TiO2 NPs was evaluated with different species of bacteria such as Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, and Staphylococcus aureus, using the liquid approach. The optimum activity of TiO2 NPs is found to be against E. coli at 1000 μg mL−1. Furthermore, adding, TiO2 NPs (1000 μg mL−1) in the presence of amoxicillin has a synergic effect on E. coli and S. aureus growth, as measured by the well diffusion method. However, both E. coli (11.6 ± 0.57mm) and S. aureus (13.3 ± 0.57mm) were inhibited by this process.

scholarly journals A Novel approach for Fabrication ZnO/CuO Nanocomposite Via Laser Ablation in Liquid and its Antibacterial Activity

2021 ◽  
pp. 103606
Author(s):  
Abbad Al Baroot ◽  
Muidh Alheshibri ◽  
Q.A. Drmosh ◽  
Sultan Akhtar ◽  
Essam Kotb ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Laser Ablation ◽  
Laser Ablation In Liquid ◽  
Novel Approach
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