scholarly journals Antibacterial properties of Ag–TiO2 composite sol–gel coatings

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59070-59081 ◽  
Author(s):  
E. Albert ◽  
P. A. Albouy ◽  
A. Ayral ◽  
P. Basa ◽  
G. Csík ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Structural Properties ◽  
Composite Coatings ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Silver Doping

This study reveals the connection between the silver-doping method, the resulting nature and amount of the silver dopant together with the structural properties and the long-term antibacterial activity of composite coatings.

scholarly journals ANTIBACTERIAL EFFECT OF 0.2% CHLORHEXIDINE AND 1% CHITOSAN MOUTHWASH ON BACTERIA DURING ORTHODONTIC MINISCREW USE

2020 ◽  
pp. 8-12
Author(s):  
ERLINA HASRIATI ◽  
HARU SETYO ANGGANI ◽  
MARIA PURBIATI ◽  
ENDANG WINIATI BACHTIAR
Keyword(s):  
Antibacterial Activity ◽  
Antibacterial Effect ◽  
Antibacterial Properties ◽  
Bacterial Count ◽  
Total Bacterial Count ◽  
Double Blind ◽  
Double Blind Clinical Trial ◽  
Before And After ◽  
Polymerase Chain

Objective: Inflammation is one of the most common complications observed when using orthodontic miniscrews. Chlorhexidine mouthwash can beused to prevent and reduce the degree of inflammation, but long-term use of this solution may lead to some side effects. This study sought to evaluatethe peri-miniscrew antibacterial effect of 1% chitosan, a biomaterial with antibacterial properties, relative to 0.2% chlorhexidine mouthwash.Methods: A randomized, double-blind clinical trial was conducted at the Dental Teaching Hospital and Oral Biology Research Laboratory at theUniversity of Indonesia from February to June 2019. Thirty subjects (25 females and five males) were randomly assigned to rinse with 1% chitosan(n=10), 0.2% chlorhexidine digluconate (n=10), and Aquadest (n=10) in addition to their usual oral hygiene procedure for 4 days. Peri-miniscrewclinical inflammation signs were recorded and peri-miniscrew plaque collected before and after 4 days of rinsing. The total bacterial and red-complexbacteria count in plaque samples were evaluated by a real-time polymerase chain reaction.Results: Chitosan and chlorhexidine showed antibacterial activity, reducing total bacterial count around orthodontic miniscrews (p<0.05). Theantibacterial activity of chitosan on total bacteria was not significantly different from that of chlorhexidine (p≥0.05). Regarding the antibacterialactivity of chitosan on red-complex bacteria, the best result seen was a 58% bacteria count reduction in Tannerella denticola.Conclusion: Chitosan has potential antibacterial activity and could be used in mouthwash to maintain peri-miniscrew hygiene.

Optical, electrochemical and structural properties of long-term cycled tungsten oxide films prepared by sol–gel

2007 ◽  
Vol 396 (1-2) ◽  
pp. 164-168 ◽  
Author(s):  
Kai Huang ◽  
Jianfeng Jia ◽  
Qingtao Pan ◽  
Feng Yang ◽  
Deyan He
Keyword(s):  
Tungsten Oxide ◽  
Structural Properties ◽  
Sol Gel ◽  
Oxide Films

scholarly journals Silver Doped Magnesium Ferrite Nanoparticles: Physico-Chemical Characterization and Antibacterial Activity

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2859
Author(s):  
Erika Fantozzi ◽  
Erlinda Rama ◽  
Cinzia Calvio ◽  
Benedetta Albini ◽  
Pietro Galinetto ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Spinel Phase ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Chemical Characterization ◽  
Metallic Silver ◽  
X Ray ◽  
Gram Positive Bacteria ◽  
Physico Chemical ◽  
And Staphylococcus Aureus

Spinel phases, with unique and outstanding physical properties, are attracting a great deal of interest in many fields. In particular, MgFe2O4, a partially inverted spinel phase, could find applications in medicine thanks to the remarkable antibacterial properties attributed to the generation of reactive oxygen species. In this paper, undoped and Ag-doped MgFe2-xAgxO4 (x = 0.1 and 0.3) nanoparticles were prepared using microwave-assisted combustion and sol–gel methods. X-ray powder diffraction, with Rietveld structural refinements combined with micro-Raman spectroscopy, allowed to determine sample purity and the inversion degree of the spinel, passing from about 0.4 to 0.7 when Ag was introduced as dopant. The results are discussed in view of the antibacterial activity towards Escherichia coli and Staphylococcus aureus, representative strains of Gram-negative and Gram-positive bacteria. The sol–gel particles were more efficient towards the chosen bacteria, possibly thanks to the nanometric sizes of metallic silver, which were well distributed in the powders and in the spinel phase, with respect to microwave ones, that, however, acquired antibacterial activity after thermal treatment, probably due to the nucleation of hematite, itself displaying well-known antibacterial properties and which could synergistically act with silver and spinel.

scholarly journals Ggrafted antimicrobial cotton fabrics with N-halamine groups via atom transfer radical polymerization

2021 ◽  
Author(s):  
Panpan Peng ◽  
Ziwen Zhang ◽  
Jianjun Yang ◽  
Mingyuan Wu ◽  
Qingyun Wu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Thermal Property ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Antibacterial Properties ◽  
Cotton Fabrics ◽  
Future Application ◽  
Atom Transfer ◽  
E Coli

Abstract An N-halamine precursor 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (SCMHBMA) was synthesized and grafted on cotton fabrics via atom transfer radical polymerization for antibacterial function after chlorination. The preparation and chlorinated cotton fabrics (Cotton-g-PSMA-Cl) were characterized with FTIR, XPS, SEM, and TGA. The properties of prepared Cotton-g-PSMA-Cl, including thermal property, antibacterial efficiency, durability, and stability, were systematically evaluated. The results showed that these chlorinated Cotton-g-PSMA-Cl fabrics possessed excellent antibacterial activity against E. coli. and S. aureus. After 10 washing cycles and 60 days of routine storage, active chlorine concentrations (Cl+%) were reduced only 22% and 18%, respectively, and the reduced Cl+% effectively reverted by simple rechlorination. This new N-halamine antibacterial cotton composite with superior antibacterial properties exhibited potential for future application in the long-term antibacterial field.

Ionic Liquid–Stabilized Titania Quantum Dots Applied in Adhesive Resin

2019 ◽  
Vol 98 (6) ◽  
pp. 682-688 ◽  
Author(s):  
I.M. Garcia ◽  
V.S. Souza ◽  
C. Hellriegel ◽  
J.D. Scholten ◽  
F.M. Collares
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Quantum Dots ◽  
Antibacterial Activity ◽  
Ionic Liquid ◽  
Sol Gel ◽  
Adhesive Resin ◽  
Transmission Electron ◽  
Polymerization Behavior

Quantum dots (QDs; 1 to 10 nm) were recently synthesized by sol-gel and used as nonagglomerated nanoparticles in adhesive resin. The sol-gel process presented a low yield and resulted in a liquid product without stability. In this study, an imidazolium ionic liquid (IL; 1- n-butyl-3-methylimidazolium tetrafluoroborate, BMI.BF4) was used as stabilizing agent to synthesize titanium dioxide QDs (TiO2QDs/BMI.BF4) via a chemical route. The product was isolated as powder after washing, centrifuging, and drying. An experimental adhesive resin was formulated by mixing methacrylate monomers and a photoinitiator system. The TiO2QDs/BMI.BF4 powder was incorporated at 2.5 (G2.5%) and 5 (G5%) wt% in the adhesive resin, and one group remained without TiO2QDs/BMI.BF4 powder as the control (Gctrl). The TiO2QDs/BMI.BF4 powder was analyzed by micro-Raman spectroscopy, thermogravimetry, and transmission electron microscopy. The dispersion of TiO2QDs/BMI.BF4 powder was analyzed in the polymerized adhesive resin with transmission electron microscopy and fluorescence microscopy. The adhesive resins were evaluated for immediate and long-term antibacterial activity, cytotoxicity, polymerization behavior, degree of conversion, softening in solvent, immediate and long-term microtensile bond strength, and fracture pattern. The TiO2QDs/BMI.BF4 powder showed peaks of anatase and rutile and 26 wt% of BMI.BF4. TiO2QDs/BMI.BF4 presented a minimum size of 1.19 nm, a maximum size of 7.11 nm, and a mean ± SD size of 3.54 ± 1.08 nm. TiO2QDs/BMI.BF4 was dispersed in the adhesive resin without agglomeration, presenting intermittent luminescence by blinking. The addition of any tested concentration of TiO2QDs/BMI.BF4 powder provided immediate and long-term antibacterial activity without cytotoxic effect against the pulp fibroblasts. Furthermore, compared with Gctrl, G2.5% showed reliable polymerization behavior and degree of conversion without differences for softening in solvent with maintenance of bond adhesion to tooth immediately and over time. Thus, the incorporation of 2.5 wt% of TiO2QDs/BMI.BF4 in adhesive resin showed reliable physical, chemical, and biological properties.

scholarly journals Antibacterial Activity of Visible Light-Activated TiO2 Thin Films with Low Level of Fe Doping

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Dan Meng ◽  
Xiuhua Liu ◽  
Yun Xie ◽  
Yang Du ◽  
Yong Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Antibacterial Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Dip Coating ◽  
Tio2 Thin Films ◽  
X Ray

Development of effective antibacterial visible light-activated photocatalytic materials in industries including wastewater treatment and food industry has attracted increasing attention. In this work, Fe-doped TiO2 thin films with different doping levels on a glass substrate were prepared by the sol-gel dip-coating method. The as-prepared films were characterized by Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM). Raman spectroscopy and XRD results show the crystalline phase of titanium dioxide was anatase, and the range of the crystal size for the films was 19.24–22.24 nm. XPS results indicate that iron was in the form of Fe3+ in Fe-doped TiO2 films. Regarding the antibacterial properties of TiO2 films, the order of antibacterial activity of TiO2 films was 0.1 at% Fe > 0.5 at% Fe > 1.0 at% TiO2 > bare TiO2 > 2.0 at% Fe > 3.45 at% Fe. 0.1 at% of Fe is the optimum dopant ratio related to antibacterial activity. 0.1 at% Fe-doped TiO2 film is highly efficient in inactivating E. coli under 3 h of visible light irradiation, and it remains efficient even in real dye waste water.

Tethering silver ions on amino-functionalized mesoporous silica for enhanced and sustained antibacterial properties

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 104289-104298 ◽  
Author(s):  
Chengwei Wang ◽  
Hua Hong ◽  
Zhaofen Lin ◽  
Yuan Yuan ◽  
Changsheng Liu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Mesoporous Silica ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Amino Group ◽  
Effective Strategy ◽  
Highly Efficient ◽  
Functionalized Mesoporous Silica ◽  
Surgical Implantation

Amino group-based tethering method is an effective strategy to load Ag ions for long-term and highly efficient antibacterial activity. The developed Ag–CaMSS is a promising surgical implantation material with excellent antibacterial activity.

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.

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