scholarly journals Biodegradation and Antimicrobial Properties of Zinc Oxide–Polymer Composite Materials for Urinary Stent Applications

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1002
Author(s):  
Chaitra Venkatesh ◽  
Marco Laurenti ◽  
Marina Bandeira ◽  
Eduardo Lanzagorta ◽  
Lorenzo Lucherini ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Mechanical And Thermal Properties ◽  
Twin Screw Extrusion ◽  
Functional Coating ◽  
Twin Screw ◽  
Artificial Urine ◽  
Bacteria Adhesion

Research advancements in the field of urinary stents have mainly been in the selection of materials and coatings to address commonly faced problems of encrustation and bacterial adhesion. In this study, polylactic acid (PLA) and polypropylene (PP) were evaluated with zinc oxide (ZnO) coating to assess its ability to reduce or eliminate the problems of encrustation and bacteria adhesion. PLA and PP films were prepared via twin screw extrusion. ZnO microparticles were prepared using sol-gel hydrothermal synthesis. The as-prepared ZnO microparticles were combined in the form of a functional coating and deposited on both polymer substrates using a doctor blade technique. The ZnO-coated PP and PLA samples as well as their uncoated counterparts were characterized from the physicochemical standpoints, antibacterial and biodegradation properties. The results demonstrated that both the polymers preserved their mechanical and thermal properties after coating with ZnO, which showed a better adhesion on PLA than on PP. Moreover, the ZnO coating successfully enhanced the antibacterial properties with respect to bare PP/PLA substrates. All the samples were investigated after immersion in simulated body fluid and artificial urine. The ZnO layer was completely degraded following 21 days immersion in artificial urine irrespective of the substrate, with encrustations more evident in PP and ZnO-coated PP films than PLA and ZnO-coated PLA films. Overall, the addition of ZnO coating on PLA displayed better adhesion, antibacterial activity and delayed the deposition of encrustations in comparison to PP substrates.

Synthesis and Antimicrobial Properties of Zinc Oxide Nanoparticles

2020 ◽  
Vol 20 (10) ◽  
pp. 5977-5996 ◽  
Author(s):  
Saee Gharpure ◽  
Balaprasad Ankamwar
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Physical Contact ◽  
Oxide Nanoparticles ◽  
Synthesis Methods ◽  
Promising Alternative

With increase in incidence of multidrug resistant pathogens, there is a demand to adapt newer approaches in order to combat these diseases as traditional therapy is insufficient for their treatment. Use of nanotechnology provides a promising alternative as antimicrobial agents as against traditional antibiotics. Metal oxides have been exploited for a long times for their antimicrobial properties. Zinc oxide nanoparticles (ZnO NPs) are preferred over other metal oxide nanoparticles because of their bio-compatible nature and excellent antibacterial potentials. The basic mechanism of bactericidal nature of ZnO nanoparticles includes physical contact between ZnO nanoparticles and the bacterial cell wall, generation of reactive oxygen species (ROS) as well as free radicals and release of Zn2+ ions. This review focuses on different synthesis methods of ZnO nanoparticles, various analytical techniques frequently used for testing antibacterial properties, mechanism explaining antibacterial nature of ZnO nanoparticles as well as different factors affecting the antibacterial properties.

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 Mechanistic Study of Antibacterial Properties of Chemically Synthesize Zinc Oxide Nanoparticles

2019 ◽  
Vol 2 (1) ◽  
pp. 42-52
Author(s):  
Abdur Rehman ◽  
Saira Ahmad ◽  
Abdul Mateen ◽  
Huma Qamar ◽  
Mudaber Ahmad Mubashar ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Bacterial Strain ◽  
Zinc Oxide Nanoparticles ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Mechanistic Study ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Wide Range

Nanotechnology is the science, engineering and technology conducted at the scale that ranges between 1-100 nanometers. For the bio-application, evolution of nanotechnology is creating the concern of scientists towards the synthesis of nanoparticles. The nanoparticles have unique characteristics as compare to bulk materials. Zinc oxide (ZnO) is a matchless semiconductor and it has been under investigation due to its wide range of applications in various areas like biomedical, electronics, material science and optics. In the present work synthesis of ZnO nanoparticles was carried out by using simple chemical approach, Sol-gel method for being effective and inexpensive, by employing zinc acetate dehydrate Zn (CH3CO2)2.2H2O as a precursor and sodium hydroxide (NaOH) starch as a constant agent. The structural properties of resultant zinc oxide nanoparticles were investigated by X-ray diffraction (XRD) technique. The XRD data confirmed the hexagonal wurtzite structure of ZnO powder confirmed by JCPDS 36-1451 data. Particles size was calculated by Scherrer formula and calculated size was 30.14 nm. These nanoparticles were investigated for inhibition zone of bacterial strain Escherichia coli, a gram-negative microbe, at various concentrations of ZnO nanoparticles. Zinc oxide nanoparticles were very proficient for inhibition of growth of bacterial strain E. coli. The mechanism of ZnO NPs for antibacterial activity is release of reactive oxygen species which not only hydrolyze cell wall but cell membrane and cellular components as well providing a potential bactericidal effect.

Effect of Silica Nanoparticles on Reinforcement of Poly(phenylene ether) Based Thermoplastic Elastomer

2008 ◽  
Vol 8 (4) ◽  
pp. 2114-2126
Author(s):  
Samik Gupta ◽  
Parnasree Maiti ◽  
Kumar Krishnamoorthy ◽  
Raja Krishnamurthy ◽  
Ashok Menon ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Sol Gel ◽  
Soxhlet Extraction ◽  
Thermoplastic Elastomer ◽  
Ethylene Vinyl Acetate ◽  
Spectroscopic Studies ◽  
Extensive Study ◽  
Silica Sol ◽  
Twin Screw Extrusion ◽  
Twin Screw

Reinforcement of a novel poly(phenylene ether) (PPE) based thermoplastic elastomer (TPE), i.e., styrene-ethylene-butylene-styrene (SEBS)/ethylene vinyl acetate (EVA) and PPE-polystyrene (PS), was studied to develop a reinforced thermoplastic elastomer or thermoplastic vulcanizate (TPV). An effort was made to reinforce selectively the elastomeric dispersed phase of EVA by silica nanoparticles and silica sol–gel precursors, like alkoxy orthosilanes, using twin-screw extrusion and injection molding processes. Improvement of tensile strength and percent elongation at break was observed both with silica nanoparticles and tetraethoxy orthosilane (TEOS). Addition of TEOS transformed the dispersed EVA lamellar morphology into semispherical domains as a consequence of possible crosslinking. Soxhlet extraction was done on the silica and TEOS reinforced materials. The insoluble residues collected from both the silica and TEOS reinforced samples were analyzed in detail using both morphological and spectroscopic studies. This extensive study also provided an in-depth conceptual understanding of the PPE based TPE behavior upon reinforcement with silica nanoparticles and silica sol–gel precursors and the effect of reinforcement on recycling behavior.

Red mud/polypropylene composite with mechanical and thermal properties

2011 ◽  
Vol 45 (26) ◽  
pp. 2811-2816 ◽  
Author(s):  
Yihe Zhang ◽  
Anzhen Zhang ◽  
Zhichao Zhen ◽  
Fengzhu Lv ◽  
Paul K. Chu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Thermal Properties ◽  
Impact Strength ◽  
Flexural Strength ◽  
Red Mud ◽  
Softening Temperature ◽  
Mechanical And Thermal Properties ◽  
Twin Screw Extrusion ◽  
Twin Screw ◽  
The Impact

Polypropylene (PP) based composites containing 0, 5, 10, 15, 20, 30, and 50 wt% red mud are granulated by twin-screw extrusion and injection molding. Their mechanical properties such as tensile strength, flexural strength and modulus, impact strength, and thermal properties are determined. After filling with red mud, the flexural strength and modulus, thermal deformation temperature, and Vicat softening temperature increase, whereas the impact strength decreases with increasing red mud contents. The maximum tensile strength is observed from the PP doped with 15 wt% red mud. Scanning electron microscopy (SEM) is used to investigate the dispersion of red mud in the PP matrix.

Mechanical and Thermal Properties of Highly Organized Nanowire-Alumina Nanocomposites

2010 ◽  
Author(s):  
Johan Rivera ◽  
Ongi Englander
Keyword(s):  
Zinc Oxide ◽  
Thermal Properties ◽  
Chemical Vapor Deposition ◽  
High Temperature ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Sol Gel ◽  
Chemical Vapor ◽  
Mechanical And Thermal Properties ◽  
Annealing Step

The use of porous anodic alumina allows for the fabrication of highly ordered unidirectional nanowire composites. Sol gel deposition was used in the successful fabrication of zirconia-alumina and zinc oxide-alumina nanocomposites. Silicon-alumina and germanium-alumina nanocomposites were fabricated via catalyst-assisted chemical vapor deposition. The mechanical and thermal properties of these alumina nanocomposites were investigated. The Vickers hardness of the different nanocomposites was established by means of microindentation. Vickers testing was performed at room temperature and after specified heat treatments. The high temperature treatments were performed in order to assess the effect of an annealing step on the properties of the nanocomposites. Thermal cycling experiments were performed to test the nanocomposites’ compatibility with recurring high temperature environments.

Antibacterial Activity of Ag-TiO2 Nanoparticles with Various Silver Contents

2013 ◽  
Vol 756 ◽  
pp. 238-245 ◽  
Author(s):  
Nur Hidayati Ahmad Barudin ◽  
Srimala Sreekantan ◽  
Ong Ming Thong ◽  
Geethaa Sahgal
Keyword(s):  
Antibacterial Activity ◽  
Metallic Nanoparticles ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Bacterial Count ◽  
Inhibition Zone ◽  
Light Irradiation ◽  
Great Promise ◽  
Uniform Size

Bacterial are highly transmitted in our environment and have been identified as a primary contributor to the problem of indoor air quality and consequently lead to the illness of the occupants. Recently, nanotechnology represents an innovative approach to develop new formulations based on metallic nanoparticles with antimicrobial properties. TiO2 has great promise to diminish bacterial activity. Antimicrobial activity of TiO2and Ag-TiO2 nanoparticles against Escherichia coli was examined in this study. TiO2 nanoparticles with various silver contents were synthesized by sol gel method to produce uniform size, unagglomerated state and homogeneous nanoparticles. The nanoparticles were characterized by X-Ray diffraction (XRD) and transmittance electron microscopy (TEM). The effects of different silver concentration were studied using cotton diffusion test under fluorescence light irradiation. 0.06 mol % Ag-TiO2 revealed best antibacterial activity. 0.06 mol % Ag-TiO2 have antibacterial inhibition zone of 38 mm at the concentration of 2.0 M against E. coli. Swab test bacterial counts on left palm, tile, mouse pad and cotton have been tested before and after spraying with 0.06 mol % Ag-TiO2. It showed that the bacterial count decreased for entire samples. The significant enhancement in the antibacterial properties of Ag-TiO2 nanoparticles under visiblelight irradiation is related to the effect of noble metal Ag by acting as electron traps in TiO2 band gap. The phase structure, crystallite size and crystallinity of TiO2 also play an important role inantibacterial activity. The killing mechanism of Ag-TiO2 undervisible light irradiation antibacterial activity over Ag-TiO2nanoparticles was proposed based on our observations.

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