scholarly journals Green synthesis of titanium dioxide nanoparticles using Cassia fistula and its antibacterial activity

2019 ◽  
Vol 10 (2) ◽  
pp. 856-860 ◽  
Author(s):  
Swathi N ◽  
Sandhiya D ◽  
Rajeshkumar S ◽  
Lakshmi T
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Green Synthesis ◽  
Fourier Transforms ◽  
Titanium Dioxide Nanoparticles ◽  
Cassia Fistula ◽  
Force Microscopy ◽  
Sem Image ◽  
Atomic Force ◽  
Vis Spectroscopy

Green synthesis of titanium oxide nanoparticles has more advantages when compared with the chemical method. This work reports a green synthesis of titanium dioxide nanoparticles (TiO2NPs) by the herbal plant extracts of Cassia fistula. Then the green synthesized NPs were characterized by UV-Vis spectroscopy, X-ray Diffraction (XRD), Fourier transforms infra-Red spectroscopy (FT-IR), atomic force microscopy (AFM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA). The result of the SEM image shows that the nanoparticles are spherical in shape. The antibacterial activity was done on Escherichia coli and Staphylococcus aureus.

scholarly journals Synthesis and Characterization of Titanium Dioxide Nanoparticles under Different pH Conditions

2018 ◽  
Vol 25 (1) ◽  
pp. 40-50
Author(s):  
Basma Abbas Abdulmajeed ◽  
Sameera Hamadullah ◽  
Fadhil Abed Allawi
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Ammonium Hydroxide ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Size Growth ◽  
Ph Level

Ethanol as a solvent, a precursor of titanium isopropoxide and a stabilizer of either hydrochloric acid or ammonium hydroxide was used to prepare a titanium dioxide aqueous solution. The aqueous solutions with different values of pH and the morphology of the resultant reaction of the nanoparticles of titanium dioxide were investigated. The X-ray diffraction showed that at low temperatures and with acidic solutions, rutile structures are more favorable to grow on titanium dioxide synthesized, while at low and average temperatures and with base solutions, anatase phase is more pronounced. The crystalline form and the re-confirmation of the crystallite size growth were observed by the scanning electron microscopy. The atomic force microscopy was used to confirm the relation between the roughness and thickness with the pH level.  

Dewetting Suppression of Polystyrene Thin Film Using Titanium Dioxide Nanoparticles

2014 ◽  
Vol 608 ◽  
pp. 218-223 ◽  
Author(s):  
Nampueng Pangpaiboon ◽  
Nisanart Traiphol
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Force Microscopy ◽  
Spin Casting ◽  
Polymeric Thin Film ◽  
Atomic Force ◽  
Base Polymer ◽  
Wafer Substrate ◽  
Si Wafer

Effects of titanium dioxide nanoparticles on thermal stability of polymeric thin film are investigated in this study. Polystyrene with molecular weight of 52,000 g/mol is used as a base polymer. The concentrations of titanium dioxide nanoparticles in polystyrene are varied from 0-0.20 wt.%. Films are fabricated by spin casting on Si wafer substrate and annealed at 180 °C and 190 °C for various times in order to study dynamics of dewetting. Film morphologies are analysed by optical microscopy and atomic force microscopy. Dewetting areas of each film as a function of annealing time are determined. It is found that addition of titanium dioxide nanoparticles suppresses dewetting in polystyrene film with thicknesses of ~30 nm and ~100 nm. The same titanium dioxide amounts, on the other hand, accelerate dewetting process in the film with thickness of ~265 nm. Mechanisms of dewetting suppression in polymeric film by titanium dioxide nanoparticles are discussed.

scholarly journals Biosynthesis of TiO2 nanoparticles using prodigiosin and evaluating its antibacterial activity against biofilm producing MDR- Acinetobacter baumannii

2020 ◽  
Vol 13 (2) ◽  
pp. 137-151
Author(s):  
Dalia Ahmed ◽  
Laith Yaaqoob ◽  
Sehand Arif
Keyword(s):  
Antimicrobial Activity ◽  
Atomic Force Microscopy ◽  
Antibacterial Activity ◽  
16S Rrna ◽  
Tio2 Nanoparticles ◽  
Titanium Dioxide Nanoparticles ◽  
Drug Resistant ◽  
Tio2 Nps ◽  
Force Microscopy ◽  
Atomic Force

A rising number of hospital infections were caused by multi drug resistant A.baumannii. This microorganism has become a big global concern for clinicians. This study aimed to evaluate the antimicrobial activity of biosynthesized TiO2 nanoparticles against biofilm producing multi drug resistant A. baumannii. Bacteria were isolated from burn wounds. The selected isolate was identified using the routine biochemical assays, viteck 2, and confirmed by PCR technique, targeting the 16S rRNA and blaOXA-51 genes. Antimicrobial susceptibility tests were performed using Viteck 2 system and the biofilm production was tested by using microtiter plate method. S marcescens was used for production of the prodigiosin which characterized later by UV-visible spectroscopy and then was used for biosynthesis of titanium dioxide nanoparticles (TiO2) NPs. Atomic force microscopy, X-ray diffractometer and field emission scanning electron microscopy were used for characterization of TiO2 NPs. Antimicrobial activity of TiO2 NPs was examined by well diffusion assay using concentration of 0.4- 0.006 mg/ml. The studied isolate was beta-lactamase producer and showed resistance to aminoglycosides, quinolones, furanes and trimethoprim/ sulphonamide, PCR amplification of 16S rRNA and blaOXA-51 genes was used for detection of A baumannii. The selected isolate was a strong biofilm producer with 5.9 times more than the OD values of the control. Atomic force microscopy images showed that the synthesized TiO2 NPs were in spherical shape with an average diameter of 67.49 nm. The TiO2 NPs inhibited the bacterial growth at concentrations of ≥ 0.1mg/ ml and a maximum zone of inhibition recorded was 22 mm at concentration of 0.4 mg/ ml. Biosynthesis of TiO2 NPs using prodigiosin was showed a promising antibacterial activity against strong biofilm producing MDR- A. baumannii.

Impact of titanium dioxide nanoparticles on intestinal community in the 2,4,6-Trinitrobenzenesulfonic acid (TNBS)-induced acute colitis mice and the intervention effect of vitamin E

Nanoscale ◽  
2020 ◽  
Author(s):  
Yanjun Gao ◽  
Tingyu Li ◽  
Shuming Duan ◽  
Lizhi Lv ◽  
Yuan Li ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Vitamin E ◽  
Titanium Dioxide Nanoparticles ◽  
Trinitrobenzenesulfonic Acid ◽  
Acute Colitis ◽  
Intervention Effect ◽  
Tio2 Nps

Titanium dioxide nanoparticles (TiO2-NPs) is widely applicated as additives in foods for its excellent whitening and brightening capability. Although the toxicity and antibacterial activity of TiO2-NPs has been extensively studied,...

scholarly journals Antibacterial Activity of Silver Nanoparticles Synthesized by Bark Extract of Syzygium cumini

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ram Prasad ◽  
Vyshnava Satyanarayana Swamy
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Cost Effective ◽  
Diffusion Method ◽  
Bark Extract ◽  
Force Microscopy ◽  
Atomic Force ◽  
Cost Effective Method ◽  
Uv Visible ◽  
Major Attention

The unique property of the silver nanoparticles having the antimicrobial activity drags the major attention towards the present nanotechnology. The environmentally nontoxic, ecofriendly, and cost-effective method that has been developed for the synthesis of silver nanoparticles using plant extracts creates the major research interest in the field of nanobiotechnology. The synthesized silver nanoparticles have been characterized by the UV-visible spectroscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM). Further, the antibacterial activity of silver nanoparticles was evaluated by well diffusion method, and it was found that the biogenic silver nanoparticles have antibacterial activity against Escherichia coli (ATCC 25922), Staphylococcus aureus (ATCC 29213), Pseudomonas aeruginosa (ATCC 27853), Azotobacter chroococcum WR 9, and Bacillus licheniformis (MTCC 9555).

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