scholarly journals Aegle marmelos phytochemical stabilized synthesis and characterization of ZnO nanoparticles and their role against agriculture and food pathogen

2019 ◽  
Vol 8 (1) ◽  
pp. 488-495 ◽  
Author(s):  
J. Fowsiya ◽  
I.V. Asharani ◽  
Simron Mohapatra ◽  
Akhila Eshapula ◽  
Pragya Mohi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Sem Analysis ◽  
Aegle Marmelos ◽  
Zno Nps ◽  
Tem Analysis ◽  
Phenolic Group ◽  
Ft Ir ◽  
Agriculture And Food ◽  
Immense Potential

Abstract Nature and nanotechnology have not yet achieved a lucid correlation in the field of science but together they have exhibited immense potential towards the advancement and modification in future science and technology. Due to the unique properties of nanomaterials like nanoparticles gained considerable importance. Among all the nanoparticles, zinc oxide (ZnO NPs) are greatly utilized in sensors, catalysis, bioscience, etc. Antimicrobial activity by ZnO NPs had more attention by the implementation of nanotechnology for the preparation of ZnO NPs. At present, antimicrobial activity of ZnO NPs using Aegle marmelos (A. marmelos) leaves extract was done. The ZnO NPs subjected to UV-Vis, FT-IR, XRD, SEM and TEM analysis. The presence of phenolic group in extract has the capacity to form ZnO NPs and act as stabilizing agent. Every 5 min interval ZnO NPs was formed which recorded by UV-Vis spectrophotometer. The SEM analysis displayed a fine spherical ZnO NPs and EDAX report showed that the existence of zinc and oxygen in the ratio of 30.51% and 69.49%. The antimicrobial activity of ZnO NPs has high percentage inhibition against A. niger at 1000 ppm. Till now, no research carryout on A. marmelos mediated ZnO NPs and applications towards antimicrobial activity.

Synthesis and Characterization of Biomass Supported Ag, Co and Ag-Co Nanoparticles

2016 ◽  
Vol 857 ◽  
pp. 480-484
Author(s):  
Nur Izzati Mohd Anuar ◽  
Jeyashelly Andas
Keyword(s):  
Oxidation State ◽  
Silica Surface ◽  
Sol Gel ◽  
Spherical Shape ◽  
Synthesis And Characterization ◽  
Tem Analysis ◽  
Mean Size ◽  
Ft Ir ◽  
Co Nanoparticles

Silica extracted from rice husk was used as a support to synthesize the monometallic Ag, Co and bimetallic Ag-Co nanoparticles. The nanoparticles were prepared via a sol-gel method by adding glucose as the reducing agent. The prepared nanoparticles were designated as Ag-NP, Co-NP and AgCo-NP. The successful incorporation of Ag/Co onto the silica surface were evidenced by TEM, FT-IR and DR/UV-Vis analysis. The TEM analysis showed the presence of small spherical shape nanoparticles with an average mean size of 3.18-3.57 nm. Through DR/UV-Vis analysis, the presence of Ag+ and cobalt in the oxidation state of +2 and +3 were confirmed, while FT-IR verified the presence of M-O and Si-O-M+ bond.

scholarly journals Antimicrobial Activity and Characterization of Pomegranate Peel-Based Carbon Dots

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Waseem Akhtar Qureshi ◽  
B. Vivekanandan ◽  
J. Altrin Jayaprasath ◽  
Daoud Ali ◽  
Saud Alarifi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Carbon Dots ◽  
Diffusion Method ◽  
Moderate Activity ◽  
E Coli ◽  
Analytical Instruments ◽  
Antimicrobial Efficiency ◽  
Microbial Efficiency ◽  
Ft Ir

This investigation reports the use of agrowaste pomegranate peels as an economical source for the production of fluorescent carbon dots (C-dots) and their potential application as an antimicrobial agent. The carbon dots were prepared through low-temperature carbonization at 200°C for 120 min. The obtained C-dots were found to be small in size and exhibited blue luminescence at 350 nm. Further, the synthesized C-dots were characterized with the help of analytical instruments such as DLS, UV-visible, FT-IR, TEM, and fluorescence spectrophotometer. Antimicrobial activity of the C-dot PP was estimated by the agar diffusion method and MIC. S. aureus and K. pneumoniae are showing susceptibility towards C-dot PP when compared to the standard and showing a moderate activity against P. aeruginosa and resistance towards E. coli. The obtained C dot PPs were found to be around 5-9 nm in size confirmed from DLS analysis and supported by TEM. The synthesized C-dots were investigated to understand their microbial efficiency against pathogens and found to have antimicrobial efficiency. These results suggest that pomegranate peels are a potential source of carbon dots with antimicrobial efficiency.

Synthesis and Characterization of Ag-Decorated TiO2 Nanoparticles for Photocatalytic Application

2021 ◽  
Vol 10 (4) ◽  
pp. 13-18
Author(s):  
K. Balachandran ◽  
G. Vijayakumar ◽  
S. Mageswari ◽  
A. Preethi ◽  
M.S. Viswak Senan
Keyword(s):  
Grain Size ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Tem Analysis ◽  
Photocatalytic Application ◽  
Visible Spectra ◽  
Sol Gel Process ◽  
Titanium Tetra Isopropoxide ◽  
Ft Ir

TiO2 nanoparticles (TiO2) and Ag-doped TiO2 nanocomposites (Ag-TiO2) were synthesized by the Sol-Gel process using titanium tetra isopropoxide as TiO2 and AgNO3 as Ag precursors, respectively. The synthesized nanocomposites were characterized by XRD, SEM, TEM, FT-IR, and UV­-Visible analysis. The XRD results show that Ag doping increases the grain size from 22 nm to 36 nm. From the UV-Visible spectra, the redshift in absorbance was observed, which indicates the increase in grain size and it reduces the bandgap. The TEM analysis shows that all the particles are exhibited in the nanometer range. The synthesized nanoparticles show good photocatalytic activity, and they decompose the methyl orange dye within 5 hours.

Preparation and Characterization of MCM-22 Zeolite by Varying-Temperature Hydrothermal Synthesis

2011 ◽  
Vol 197-198 ◽  
pp. 1587-1590
Author(s):  
Yue Cheng ◽  
Xiao Yuan Su ◽  
Mang Lu
Keyword(s):  
Hydrothermal Method ◽  
Amorphous Material ◽  
Sem Analysis ◽  
Bet Surface Area ◽  
N2 Adsorption ◽  
Tem Analysis ◽  
Synthesis Time ◽  
Xrd Pattern ◽  
Adsorption Desorption

MCM-22 zeolite of high crystallinity was synthesized with varying-temperature hydrothermal method. Zeolite was characterized by means of XRD, SEM, TEM and TG-DTA. XRD pattern showed that the sample was MCM-22 zeolite. SEM analysis indicated that the MCM-22 sample is in the form of thin platelet-like crystals, and no amorphous material. TEM analysis exhibited regular shaped aggregate assembled by the independent growth of many small flaky crystals. N2-adsorption/desorption analysis showed that the pore size and BET surface area of MCM-22 were 3.5 nm and 387.8 m2/g, respectively. By means of the varying-temperature hydrothermal method, synthesis time can be effectively reduced, and energy consumption also decreases.

scholarly journals Synthesis of ZnO Nanoparticles by Precipitation Method with Their Antibacterial Effect

2018 ◽  
Vol 16 (2) ◽  
pp. 117 ◽  
Author(s):  
Muhammad Fajri Romadhan ◽  
Nurgaha Edhi Suyatma ◽  
Fahim Muchammad Taqi
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Average Particle Size ◽  
Spherical Shape ◽  
Xrd Analysis ◽  
Zinc Nitrate ◽  
Sem Analysis ◽  
Precipitation Method ◽  
Average Particle ◽  
Zno Nps

The aim of this study was to synthesize and characterize Zinc oxide nanoparticles (ZnO-NPs) prepared by precipitation method. Zinc nitrate and sodium hydroxide was used as starting materials with biopolymer pectin as capping agent. ZnO-NPs were synthesized at three levels of temperatures (60, 80 and 100 °C) without or with calcinations (500 °C). Particle size analyzer (PSA) analysis results showed that the samples without calcination (T60, T80 and T100) having an average particle size respectively 105.13, 78.53, and 76.43 nm, whereas at the samples by calcination (T60C, T80C and T100C) each have average particle size of 88.73, 44.30 and 543.77 nm. The results showed that preparation of ZnO-NPs by using heating at 80 °C followed with calcinations at 500 °C (T80C) produced the smallest size. T80C samples further were analyzed using XRD, SEM and the antimicrobial activity compared with the ZnO-NPs commercials. XRD analysis confirmed that ZnO-NPs were successfully obtained and have form of pure nanostructure. SEM analysis showed that ZnO-NPs obtained has a spherical shape. Furthermore, this ZnO-NPs (T80C) has a better antimicrobial activity compared than commercial ZnO-NPs in market.

Characterization of SrxBa1−xTiO3 Pulsed Laser Deposition Thin Films

1996 ◽  
Vol 433 ◽  
Author(s):  
W Pérez ◽  
Sampriti Sen ◽  
J. Cordero ◽  
E. Ching-Prado ◽  
R.S. Katiyar ◽  
...  
Keyword(s):  
Thin Films ◽  
Sem Analysis ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
High Concentration ◽  
X Ray ◽  
Ir Reflection ◽  
Frequency Position ◽  
Ft Ir

AbstractThin films of SrTiO3 (STO) and SrxBa1−xTiO3 (SBT) with x = 0.35, 0.5, 0.9, and prepared by excimer laser deposition on LaAlO3 and MgO were studied. SEM analysis indicates that the surfaces of these films are smooth with isolated pores, except the SBT(x=0.5)/LaAlO3 sample, where a high concentration of large pores was found. X-ray diffraction (XRD) results show well oriented films. External FT-IR reflection studies reveals a band around 500 cm−x, which shows a significant frequency shift with increasing component concentration. Also, this IR-reflectivity band presents no changes between the SBT(x=0.9)/LaALO3 sample annealed at 750°C and the same film annealed at 850°C. On other hand, the STO/LaAlO3 and STO/MgO films show differences in frequency position of this reflectivity band. Raman spectra of the SBT sample with x ≥ 0.35 show broad bands associated with the BaTiO3 (BTO) material. However, all the phonons bands are broader than those in BTO, in particular the band around 309 cm−. Raman results suggest that the spectrum is a consequence of a breakdown in the translational symmetry due to defects. Raman scattering also indicates a similarity between SBT(x=0.9) at 750°C and that at 850°C. Micro-Raman and EDX analysis show that STO/MgO and SBT(x=0.35)/LaAlO3 films are close to the expected stoichiometry, while STO/LaAlO3 and SBT(x=0.9) films present deficiencies of titanium and oxygen.

Synthesis and Characterization of YB66 Nanowires

2008 ◽  
Vol 2 (1) ◽  
Author(s):  
S. Tan ◽  
P. Jash ◽  
M. Trenary
Keyword(s):  
Synthesis Method ◽  
Reaction Times ◽  
Catalyst Particle ◽  
Sem Analysis ◽  
Reaction Conditions ◽  
Tem Analysis ◽  
Analysis Techniques ◽  
Quartz Tube Furnace ◽  
Good Agreement

The objective of the current research is to synthesize yttrium boride (YB66) nanowires. Catalyst assisted growth of the nanowires under the vapor-liquid-solid (VLS) synthesis method was performed in a quartz tube furnace. The pyrolysis of diborane (B2H6) gas over yttrium oxide (Y2O3) powders with a thermally coated layer of nickel catalyst was carried out. The reaction conditions were at 925o C and a pressure of 390 mTorr with varying reaction times. SEM analysis has shown the growth of nanowires with diameters around 400 nm. A catalyst particle was also seen at the tip of the nanowires, confirming growth by the VLS mechanism. Other analysis techniques that were used include Raman spectroscopy and TEM analysis. The Raman spectra of the nanowires were in good agreement with a Raman spectrum obtained on a YB66 single crystal. However, no other evidence was obtained that the nanowires contained yttrium or that the nanowires consisted of YB66.

scholarly journals Antimicrobial Activity of Thin Solid Films of Silver Doped Hydroxyapatite Prepared by Sol-Gel Method

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Simona Liliana Iconaru ◽  
Patrick Chapon ◽  
Philippe Le Coustumer ◽  
Daniela Predoi
Keyword(s):  
Thin Films ◽  
Antimicrobial Activity ◽  
Sol Gel ◽  
Optical Emission ◽  
Antimicrobial Effect ◽  
Gel Method ◽  
Sol Gel Method ◽  
E Coli ◽  
Ft Ir

In this work, the preparation and characterization of silver doped hydroxyapatite thin films were reported and their antimicrobial activity was characterized. Silver doped hydroxyapatite (Ag:HAp) thin films coatings substrate was prepared on commercially pure Si disks by sol-gel method. The silver doped hydroxyapatite thin films were characterized by various techniques such as Scanning electron microscopy (SEM) with energy Dispersive X-ray attachment (X-EDS), Fourier transform infrared spectroscopy (FT-IR), and glow discharge optical emission spectroscopy (GDOES). These techniques have permitted the structural and chemical characterisation of the silver doped hydroxyapatite thin films. The antimicrobial effect of the Ag:HAp thin films onEscherichia coliandStaphylococcus aureusbacteria was then investigated. This is the first study on the antimicrobial effect of Ag:HAp thin films obtained by sol-gel method. The results of this study have shown that the Ag:HAp thin films withxAg=0.5are effective againstE. coliandS. aureusafter 24 h.

Synthesis and Characterization of Molecularly Imprinted Polymers for Quercetin

2013 ◽  
Vol 17 ◽  
pp. 71-78
Author(s):  
Neelam Verma ◽  
Nitu Trehan
Keyword(s):  
Molecularly Imprinted Polymers ◽  
Binding Sites ◽  
Fruits And Vegetables ◽  
Sem Analysis ◽  
Molecularly Imprinted ◽  
Imprinted Polymers ◽  
Inflammatory Agent ◽  
One Step ◽  
Ft Ir

Quercetin is a flavonoid present in herbs, fruits and vegetables. It acts as an antioxidant, anticancer and anti-inflammatory agent. Molecularly Imprinted Polymers (MIPs) were prepared for quercetin by non-covalent approach in the presence of monomer acrylamide, EGDMA as the crosslinker, AIBN as the initiator and methanol and ethyl acetate as porogenic solvents. Most stable MIPs were synthesized using methanol as the solvent. Step wise removal of the template with methanol and acetic acid (9:1) left binding sites that retain complementary specificity and affinity. These stable MIPs were analysed by FT-IR technique. It was observed that there was hydrogen bonding between the template and the functional monomer. This study was further supported by NMR analysis for MIPs and NMIPs (control polymer) that cavity for quercetin has been created in MIPs and absent in the case of NMIPs. MIPs were characterized by SEM analysis that showed more clusters in case of MIPs than NMIPs as an effect of imprinting. These MIPs can be used for extraction of quercetin from herbs in a one step process.

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