scholarly journals Bacteriostatic Activity of LLDPE Nanocomposite Embedded with Sol–Gel Synthesized TiO2/ZnO Coupled Oxides at Various Ratios

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 878 ◽  
Author(s):  
Khairul Saharudin ◽  
Srimala Sreekantan ◽  
Norfatehah Basiron ◽  
Yong Khor ◽  
Nor Harun ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Polymer Nanocomposite ◽  
Zinc Ion ◽  
Active Species ◽  
Ion Release ◽  
E Coli ◽  
Bactericidal Effects

Metal oxide-polymer nanocomposite has been proven to have selective bactericidal effects against the main and common pathogens (Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli)) that can cause harmful infectious diseases. As such, this study looked into the prospect of using TiO2/ZnO with linear low-density polyethylene (LLDPE) to inactivate S. aureus and E. coli. The physical, structural, chemical, mechanical, and antibacterial properties of the nanocomposite were investigated in detail in this paper. The production of reactive species, such as hydroxyl radicals (•OH), holes (h+), superoxide anion radicals (O2•¯), and zinc ion (Zn2+), released from the nanocomposite were quantified to elucidate the underlying antibacterial mechanisms. LLDPE/25T75Z with TiO2/ZnO (1:3) nanocomposite displayed the best performance that inactivated S. aureus and E. coli by 95% and 100%, respectively. The dominant reactive active species and the zinc ion release toward the superior antibacterial effect of nanocomposite are discussed. This work does not only offer depiction of the effective element required for antimicrobial biomedical appliances, but also the essential structural characteristics to enhance water uptake to expedite photocatalytic activity of LLDPE/metal oxide nanocomposite for long term application.

Nanostructured TiO2-Based Composites for Light Absorption

2014 ◽  
Vol 975 ◽  
pp. 207-212
Author(s):  
Dayse I. dos Santos ◽  
Olayr Modesto Jr. ◽  
Luis Vicente A. Scalvi ◽  
Americo S. Tabata
Keyword(s):  
Metal Oxide ◽  
Light Absorption ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Oxide Powders

Metal oxide nanocomposites were prepared by two different routes: polyol and sol-gel. Characterization by X ray diffraction showed that the first process produces directly a two-phase material, while the sol-gel powder never showed second phase below 600°C. Light spectroscopy of the treated powders indicated similarities for the processed materials. Although the overall material compositions are about the same, different structural characteristics are found for each processing. With the exception of Ti-Zn materials, all the double metal oxide powders showed higher absorbance than either TiO2 powder.

scholarly journals Antibacterial Properties of Zn Doped Hydrophobic SiO2 Coatings Produced by Sol-Gel Method

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 362
Author(s):  
Bożena Pietrzyk ◽  
Katarzyna Porębska ◽  
Witold Jakubowski ◽  
Sebastian Miszczak
Keyword(s):  
Sol Gel ◽  
Antibacterial Properties ◽  
Zinc Nitrate ◽  
Surface Wettability ◽  
Gel Method ◽  
Sol Gel Method ◽  
E Coli ◽  
Source Of Infection ◽  
Bacteria Adhesion ◽  
Hydrophobic Sio2

Bacteria existing on the surfaces of various materials can be both a source of infection and an obstacle to the proper functioning of structures. Increased resistance to colonization by microorganisms can be obtained by applying antibacterial coatings. This paper describes the influence of surface wettability and amount of antibacterial additive (Zn) on bacteria settlement on modified SiO2-based coatings. The coatings were made by sol-gel method. The sols were prepared on the basis of tetraethoxysilane (TEOS), modified with methyltrimethoxysilane (MTMS), hexamethyldisilazane (HMDS) and the addition of zinc nitrate or zinc acetate. Roughness and surface wettability tests, as well as study of the chemical structure of the coatings were carried out. The antibacterial properties of the coatings were checked by examining their susceptibility to colonization by Escherichia coli. It was found that the addition of zinc compound reduced the susceptibility to colonization by E. coli, while in the studied range, roughness and hydrophobicity did not affect the level of bacteria adhesion to the coatings.

scholarly journals Antibacterial Activity and Iron Release of Organic-Inorganic Hybrid Biomaterials Synthesized via the Sol-Gel Route

2021 ◽  
Vol 11 (19) ◽  
pp. 9311
Author(s):  
Michelina Catauro ◽  
Ylenia D’Errico ◽  
Antonio D’Angelo ◽  
Ronald J. Clarke ◽  
Ignazio Blanco
Keyword(s):  
Hybrid Materials ◽  
Release Kinetics ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Iron Release ◽  
Biological Characterization ◽  
Visible Spectroscopy ◽  
E Coli ◽  
Hybrid Biomaterials ◽  
Kinetics Of

The aim of this work was the synthesis of hybrid materials of iron (II)-based therapeutic systems via the sol-gel method. Increasing amounts of polyethylene glycol (PEG 6, 12, 24, 50 wt%) were added to SiO2/Fe20 wt% to modulate the release kinetics of the drug from the systems. Fourier-transform infrared (FTIR) spectroscopy was used to study the interactions between different components in the hybrid materials. The release kinetics in a simulated body fluid (SBF) were investigated, and the amount of Fe2+ released was detected via ultraviolet-visible spectroscopy (UV-Vis) after reaction with ortho-phenanthroline. Furthermore, biological characterization was carried out. The bioactivity of the synthesized hybrid materials was evaluated via the formation of a layer of hydroxyapatite on the surface of samples soaked in SBF using spectroscopy. Finally, the potential antibacterial properties of seven different materials against two different bacteria—E. coli and S. aureus—were investigated.

scholarly journals Drug Release of Hybrid Materials Containing Fe(II)Citrate Synthesized by Sol-Gel Technique

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2270 ◽  
Author(s):  
Michelina Catauro ◽  
Elisabetta Tranquillo ◽  
Federico Barrino ◽  
Ignazio Blanco ◽  
Francesco Dal Poggetto ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Hybrid Materials ◽  
Release Kinetics ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Biological Characterization ◽  
Sio2 Matrix ◽  
E Coli ◽  
Ferrous Citrate ◽  
Gel Technique

The use of oral iron integration is commonly recommended for the treatment of iron deficiency, nevertheless the diagnosis and treatment of this disease could clearly be improved. The aim of this work was the synthesis of therapeutic systems, iron (II) based, by sol-gel method. In an SiO2 matrix, we embedded different weight percentages of polyethylene glycol (PEG6, 12, 24 wt%) and ferrous citrate (Fe(II)C5, 10, 15 wt%) for drug delivery applications. Fourier Transform Infrared (FTIR) spectroscopy was used to study the interactions among different components in the hybrid materials. Release kinetics in a simulated body fluid (SBF) were investigated and the amount of Fe2+ released was detected by Ultraviolet–Visible spectroscopy (UV-VIS) after reaction with ortho-phenantroline. Furthermore, the biological characterization was carried out. The bioactivity of the synthesized hybrid materials was evaluated by the formation of a layer of hydroxyapatite on the surface of samples soaked in SBF using FTIR spectroscopy. Finally, also, the potential antibacterial properties of the different materials against two different bacteria, E. coli and P. aeruginosa, were investigated.

scholarly journals WO3-Doped TiO2Coating on Charcoal Activated with Increase Photocatalytic and Antibacterial Properties Synthesized by Microwave-Assisted Sol-Gel Method

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Weerachai Sangchay
Keyword(s):  
Methylene Blue ◽  
Antibacterial Activity ◽  
Water Purification ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Gel Method ◽  
Sol Gel Method ◽  
E Coli ◽  
Microwave Assisted

WO3-doped TiO2coating on charcoal activated (CA) was prepared by microwave-assisted sol-gel method. The samples calcined at the temperature of 500°C for 2 h with a heating rate of 10°C/min were characterized by XRD, EDS, and SEM. The photocatalytic and antibacterial activities of WO3-doped TiO2coating on CA were investigated by means of degradation of a methylene blue (MB) solution and against the bacteriaE. coli, respectively. The effects of WO3concentration were discussed. The 1% WO3-doped TiO2coated CA seems to exhibit the higher photocatalytic and antibacterial activity than other samples. The WO3-doped TiO2coated on CA are expected to be applied as a photocatalyst for water purification.

scholarly journals Preparation of Silver-Doped Alumina Spherical Beads with Antimicrobial Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
José Hafid Roque-Ruiz ◽  
Daniela Castillo-Ramírez ◽  
Álvaro de Jesús Ruíz-Baltazar ◽  
León Francisco Espinosa-Cristóbal ◽  
Simón Yobanny Reyes-López
Keyword(s):  
Antimicrobial Activity ◽  
Structural Characteristics ◽  
Dental Materials ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Sintering Process ◽  
E Coli ◽  
Wall Structures ◽  
Bactericidal Properties ◽  
Silver Dendrites

The synthesis of composites with antibacterial properties is of great interest for the development of new biomedical applications. The antimicrobial properties of silver have been verified against microorganisms such as bacteria, viruses, and fungi; interest in silver has been renewed, so several technologies are currently in development, especially in dental materials. The purpose of this work was to improve the parameters for producing silver-doped alumina spherical beads using sodium alginate as a sacrificial template. Alumina is a biocompatible and thermally stable ceramic, while silver was used for its bactericidal properties. The obtained spheres presented a mean diameter of 2 mm, with an irregular surface and intertwined particles after a sintering process. After electrodeposition, white spheres turned to a dark gray color, demonstrating the presence of silver nanoparticles and fractal silver dendrites on the surface. Spheres were characterized by SEM, FTIR, and XRD. Antimicrobial activity of the alumina-AgP spheres against E. coli, S. aureus, K. pneumoniae, and S. mutans was analyzed by turbidimetry. The specific antimicrobial activity of all the composites showed specific antibacterial effects, independently of the amount of silver deposited, probably due to the differences in the microbial cell wall structures. Therefore, antibacterial activity depends on microbiological and structural characteristics of each bacterium.

scholarly journals Structural, Morphological and Antimicrobial Study of ZnO/Ag Nanoparticles

2020 ◽  
Vol 13 (4) ◽  
pp. 1645-1652
Author(s):  
Richa Sharma ◽  
Suresh Kumar ◽  
Prem Singh ◽  
Shikha Kapila
Keyword(s):  
Metal Oxide ◽  
Ag Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Single Step ◽  
Oxide Nanoparticles ◽  
Bacterial Strains ◽  
X Ray ◽  
E Coli

Metal oxide nanoparticles gain attention in the field of biomedical applications because of their unique physico-chemical properties and emerging out as an alternative to antibiotics. The major cause of most of the human diseases is the bacterial infection. However, antibiotics used in the cure show other complications to human health. Therefore, the purpose of the present work is to investigate the antibacterial properties of ZnO/Ag nanoparticles on the test bacterial strains, Escherichia coli (E. coli). ZnO/Ag nanoparticles are synthesized using surfactant mediated route in a single step and double step procedure. Here, CTAB and hydrazine hydrate used as a surfactant and reducing agents respectively. The synthesized nanoparticles are characterized by x-ray diffraction, scanning electron microscopy and energy dispersive x-ray spectroscopy for structure, morphology and compositional properties. The antibacterial activities of these nanoparticles are also studied using the agar-well diffusion technique. The result analysis shows that synthesized nanopaticles are spherical in shape, having particles of the size 6 nm and 13 nm in the desired elemental composition. ZnO/Ag nanoparticles possessed a strong antibacterial effect against E. coli. This study signifies that ZnO/Ag metal oxide nanoparticles exhibit stronger antimicrobial activity against pathogen bacteria E. coli which may works effectively on the antibacterial and antifungal infections.

scholarly journals Synthesis of Silver Modified Bioactive Glassy Materials with Antibacterial Properties via Facile and Low-Temperature Route

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5115
Author(s):  
Isabel Gonzalo-Juan ◽  
Fangtong Xie ◽  
Malin Becker ◽  
Dilshat U. Tulyaganov ◽  
Emanuel Ionescu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Low Temperature ◽  
Bioactive Glass ◽  
Antibacterial Properties ◽  
Optical Emission ◽  
Infrared Spectrometry ◽  
Ion Release ◽  
E Coli ◽  
Electron Microscopies ◽  
Vis Spectroscopy

There is an increasing clinical need to develop novel biomaterials that combine regenerative and biocidal properties. In this work, we present the preparation of silver/silica-based glassy bioactive (ABG) compositions via a facile, fast (20 h), and low temperature (80 °C) approach and their characterization. The fabrication process included the synthesis of the bioactive glass (BG) particles followed by the surface modification of the bioactive glass with silver nanoparticles. The microstructural features of ABG samples before and after exposure to simulated body fluid (SBF), as well as their ion release behavior during SBF test were evaluated using infrared spectrometry (FTIR), ultraviolet-visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), electron microscopies (TEM and SEM) and optical emission spectroscopy (OES). The antibacterial properties of the experimental compositions were tested against Escherichia coli (E. coli). The results indicated that the prepared ABG materials possess antibacterial activity against E. coli, which is directly correlated with the glass surface modification.

Preparation of Nano Cu-ZnO/PET Fiber for Antibacterial Application

2017 ◽  
Vol 898 ◽  
pp. 2272-2278 ◽  
Author(s):  
Jin Jin ◽  
Ling Jie Fang ◽  
Lian Tang ◽  
Peng Ji ◽  
Chao Sheng Wang ◽  
...  
Keyword(s):  
Melt Spinning ◽  
Low Cost ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
High Strength ◽  
Melting Behavior ◽  
Polyester Fiber ◽  
Scanning Electron Micrographs ◽  
Scanning Calorimetry ◽  
E Coli

Polyethylene terephthalate (PET) fiber is applied to clothing, home textiles and other fields because of its low cost, high strength, quick-drying and stable structure, etc. Polyester fiber generally doesn’t have the ability to kill bacteria, and it is a kind of porous material which is conducive to the microbial adhesion and spread of bacteria. In the present study, Cu-ZnO and its antibacterial PET fibers were prepared by sol–gel method and melt spinning, respectively. The structures and compositions of Cu-ZnO were characterized by X-ray diffraction (XRD) and Fourier transform-infrared (FT-IR) spectra. The crystallization and melting behavior of the PET/Cu-ZnO (0.05:1) composites were tested by differential scanning calorimetry (DSC) to determine the temperate of melt spinning. The morphologies and mechanical properties of antibacterial polyester fiber were studied by field emission scanning electron micrographs (FE-SEM) and strength machine, respectively. The antibacterial properties of the samples on E. coli and S. aureus were determined using powder inhibition zones and antibacterial rate. The results show that the fibers exhibited excellent antibacterial activity, it had obvious inhibiting effects on E. coli and S. aureus and the antibacterial rate were both above 90%.

scholarly journals Synthesis of Silver Modified Bioactive Glassy Materials with Antibacterial Properties via Facile and Low-Temperature Route

2020 ◽  
Author(s):  
Isabel Gonzalo-Juan ◽  
Fangtong Xie ◽  
Malin Becker ◽  
Dilshat Tulyaganov ◽  
Emanuel Ionescu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Low Temperature ◽  
Bioactive Glass ◽  
Antibacterial Properties ◽  
Optical Emission ◽  
Infrared Spectrometry ◽  
Ion Release ◽  
E Coli ◽  
Electron Microscopies ◽  
Vis Spectroscopy

There is an increasing clinical need to develop novel biomaterials that combine regenerative and biocidal properties. In this work, we present the preparation of silver /silica based glassy bioactive (ABG) compositions via a facile, fast (20h), and low temperature (80 °C) approach and their characterization. The fabrication process included the synthesis of the bioactive glass (BG) particles followed by the surface modification of the bioactive glass with silver nanoparticles. The microstructural features of ABG samples before and after exposure to simulated body fluid (SBF) as well as their ion release behavior during SBF test were evaluated using infrared spectrometry (FTIR), ultraviolet- visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), electron microscopies (TEM and SEM) and optical emission spectroscopy (OES). The antibacterial properties of the experimental compositions were tested against Escherichia coli (E. coli). The results indicated that the prepared ABG materials possess antibacterial activity against E. coli, which is directly correlated with the glass surface modification.

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