scholarly journals Sonochemical synthesis and chracterization of Mn3O4 nanoparticles

2010 ◽  
Vol 8 (3) ◽  
pp. 633-638 ◽  
Author(s):  
Abdulhadi Baykal ◽  
Hüseyin Kavas ◽  
Zehra Durmuş ◽  
Mine Demir ◽  
Sinan Kazan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Xrd Analysis ◽  
Blocking Temperature ◽  
Sonochemical Method ◽  
Tem Analysis ◽  
Mn Oxide ◽  
Profile Fitting ◽  
Average Size ◽  
20 Nm ◽  
Mn3o4 Nanoparticles

AbstractWe report on the synthesis of Mn3O4 nanoparticles (NPs) using a novel sonochemical method without requiring any pH adjustment. Synthesized material was identified as tetragonal hausmannite crystal structure model of Mn3O4 from XRD analysis. Crystallite size was estimated from x-ray line profile fitting to be 17±5 nm. FTIR analysis revealed stretching vibrations of metal ions in tetrahedral and octahedral coordination confirming the crystal structure. TEM analysis revealed a dominantly cubic morphology of NPs with an average size of ∼20 nm. Magnetic evaluation revealed a blocking temperature, T B of 40 K above which the material behaves paramagnetic. Asymmetric coercive field is attributed to the interaction between ferromagnetic Mn3O4 and antiferromagnetic Mn oxide at the surface of nanoparticles.

scholarly journals Functional Attributes of Myco-Synthesized Silver Nanoparticles from Endophytic Fungi: A New Implication in Biomedical Applications

Biology ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 473
Author(s):  
Prabu Kumar Seetharaman ◽  
Rajkuberan Chandrasekaran ◽  
Rajiv Periakaruppan ◽  
Sathishkumar Gnanasekar ◽  
Sivaramakrishnan Sivaperumal ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Culture Filtrate ◽  
Morphological Changes ◽  
Xrd Analysis ◽  
Penicillium Oxalicum ◽  
Breast Cancer Cell Lines ◽  
Face Centered Cubic ◽  
Tem Analysis ◽  
X Ray ◽  
Average Size

To develop a benign nanomaterial from biogenic sources, we have attempted to formulate and fabricate silver nanoparticles synthesized from the culture filtrate of an endophytic fungus Penicillium oxalicum strain LA-1 (PoAgNPs). The synthesized PoAgNPs were exclusively characterized through UV–vis absorption spectroscopy, Fourier Transform Infra-Red spectroscopy (FT-IR), X-ray powder diffraction (XRD), and Transmission Electron Microscopy (TEM) with energy dispersive X-ray spectroscopy (EDX). The synthesized nanoparticles showed strong absorbance around 430 nm with surface plasmon resonance (SPR) and exhibited a face-centered cubic crystalline nature in XRD analysis. Proteins presented in the culture filtrate acted as reducing, capping, and stabilization agents to form PoAgNPs. TEM analysis revealed the generation of polydispersed spherical PoAgNPs with an average size of 52.26 nm. The PoAgNPs showed excellent antibacterial activity against bacterial pathogens. The PoAgNPs induced a dose-dependent cytotoxic activity against human adenocarcinoma breast cancer cell lines (MDA-MB-231), and apoptotic morphological changes were observed by dual staining. Additionally, PoAgNPs demonstrated better larvicidal activity against the larvae of Culex quinquefasciatus. Moreover, the hemolytic test indicated that the as-synthesized PoAgNPs are a safe and biocompatible nanomaterial with versatile bio-applications.

scholarly journals A green chemical route for the synthesis of Mn3O4 nanoparticles

2009 ◽  
Vol 7 (3) ◽  
pp. 555-559 ◽  
Author(s):  
Zehra Durmus ◽  
Hüseyin Kavas ◽  
Abdulhadi Baykal ◽  
Muhammet Toprak
Keyword(s):  
Room Temperature ◽  
Particle Sizes ◽  
Chemical Route ◽  
Tem Analysis ◽  
X Ray ◽  
Profile Fitting ◽  
Transmission Electron ◽  
Wide Range ◽  
Long Range Interactions ◽  
Mn3o4 Nanoparticles

AbstractA novel environmental friendly, room temperature route using an ionic liquid 1-n-butyl-3-methylimidazolium hydroxide ([BMIM]OH) for the synthesis of Mn3O4 nanoparticles is presented. The product was characterized using Fourier transform infrared spectroscopy, X-ray powder diffraction, and transmission electron microscopy. Phase purity was confirmed by XRD, and X-ray line profile fitting determined a crystallite size of 42 ± 11 nm. TEM analysis revealed various morphologies. EPR measurements have indicated the existence of long-range interactions, due to the wide range of particle sizes and morphologies observed.

TiO2 Nanoparticles Synthesized with Ti(SO4)2 as Precursor via the Hydrothermal Method and their Optical Absorption Properties

2017 ◽  
Vol 727 ◽  
pp. 280-283
Author(s):  
Xiao Ming Fu
Keyword(s):  
Hydrothermal Method ◽  
Ph Value ◽  
Blue Shift ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Tem Analysis ◽  
Visible Absorption ◽  
Transmission Electron ◽  
20 Nm

Anatase TiO2 particles of about 20 nm in the diameter were successfully synthesized with Ti (SO4)2 as titanium source and stronger ammonia water as precipitant at 240°C for 48 h with pH=5 using the hydrothermal method. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and ultraviolet-visible absorption spectroscopy (UV-VIS). XRD analysis showed that the phase of the samples was anatase TiO2. TEM analysis confirmed that TiO2 particles of about 50 nm in the diameter were obtained when the pH value was 0.12. With the increasement of the pH value, the size of as-prepared TiO2 particles became remarkably fine. However, with the further increase of the pH value, the size of TiO2 particles was not obvious. TiO2 particles of about 20 nm in the diameter were obtained when the pH value was 5. And UV-VIS results showed that the size of anatase TiO2 nanoparticles, which became small, was propitious to the blue shift of their absorption peak.

scholarly journals Synthesis of SiO2-TiO2:Yb3+ glass-ceramics and characterization of structure and optical properties

2017 ◽  
Vol 1 (T1) ◽  
pp. 114-121
Author(s):  
Thanh Tat Huynh ◽  
Van Thi Thanh Tran
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
Xrd Analysis ◽  
Silica Matrix ◽  
Photoluminescence Intensity ◽  
Raman Spectroscopic ◽  
Characteristic Emission ◽  
Ft Ir ◽  
Average Size ◽  
20 Nm

In this work, the monoliths of 85 % SiO2-15 % TiO2 doped Yb3+ ions at different contents have been prepared by sol-gel method. The measurement of FT-IR, Raman spectroscopic and XRD analysis show the formation of anatase TiO2 nanocrystals with average size about 15–20 nm in silica matrix. Moreover, the pyrochlore crystals of Yb2Ti2O7 begin to form in the samples when content of Yb3+ reaches to 1 mol %. TiO2 Yb3+ 2F7/2 2F5/2 truyền năng lƣợng kích thích UV EV EC mức khuyết tật 974 nm The energy transferred from TiO2 crystals to Yb3+ ions is proven by the characteristic emission spectrum of Yb3+ at the wavelength of 980 nm when the samples are excited by the wavelength of 300 nm. The photoluminescence intensity is highest at 0.1% mol of Yb3+ and gradually decreases with doping content

scholarly journals Multifaceted Phytogenic Silver Nanoparticles by a Rare Insectivorous Plant Drosera Spatulata Labill Var.bakoensis and its Enhanced Antioxidant, Antibacterial, Antifungal and in Vitro Cytotoxic Studies

2021 ◽  
Author(s):  
Susmila Aparna Gaddam ◽  
Venkata Subbaiah Kotakadi ◽  
Gunasekhar. Kalavakunta ◽  
Josthna Penchalaneni ◽  
Varadarajulu Naidu Challagundla ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Radical Scavenging ◽  
Human Colon ◽  
Xrd Analysis ◽  
Antimicrobial Activities ◽  
Human Colon Cancer ◽  
Tem Analysis ◽  
Insectivorous Plant ◽  
Average Size

Abstract The current investigation highlights the green synthesis of silver nanoparticles (AgNPs) by the insectivorous plant Drosera spatulata Labill var.bakoensis, which is the first of its kind. The biosynthesized nanoparticles revealed a UV visible surface plasmon resonance (SPR) band at 427 nm. The natural phytoconstituents which reduce the monovalent silver were identified by FTIR. The particle size of the Ds-AgNPs was detected by the Nanoparticle size analyzer confirms that the average size of nanoparticles was around 23 ± 2 nm. Ds-AgNPs exhibit high stability because of their high negative zeta potential (-34.1 mV). AFM studies also revealed that the Ds-AgNPs were spherical in shape and average size ranges from 10 to 20 ± 5 nm. TEM analysis also revealed that the average size of Ds-AgNPs was also around 21 ± 4 nm and the shape is roughly spherical and well dispersed. The crystal nature of Ds-AgNPs was detected as a face-centered cube by the XRD analysis. Furthermore, studies on antibacterial and antifungal activities manifested outstanding antimicrobial activities of Ds-AgNPs compared with standard antibiotic Amoxyclav. In addition, demonstration of superior free radical scavenging efficacy coupled with potential in vitro cytotoxic significance on Human colon cancer cell lines (HT-29) suggests that the Ds-AgNPs attain excellent multifunctional therapeutic applications.

Effect of Rare Earth Doped Elements and Characterization of LaF3:Ln3+ (Ln3+= Ce3+, Pr3+, Nd3+) Nanocrystals

2012 ◽  
Vol 585 ◽  
pp. 174-178 ◽  
Author(s):  
S.G. Gaurkhede ◽  
M.M. Khandpekar ◽  
S.P. Pati ◽  
A.T. Singh
Keyword(s):  
Rare Earth ◽  
Second Harmonic ◽  
Average Particle Size ◽  
Potassium Dihydrogen Phosphate ◽  
Xrd Analysis ◽  
Dihydrogen Phosphate ◽  
Average Particle ◽  
Tem Analysis ◽  
20 Nm

Abstract. LaF3 nanocrystals doped with lanthanides like Ce3+, Pr3+ and Nd3+ have been prepared using microwave technique. These synthesized crystals have been characterized by X-ray powder diffraction. Well dispersed, elongated, nanorods of hexagonal geometry (approximately 20nm in size) have been found in TEM analysis. The average particle size estimated from XRD analysis is about 20 nm and is in close agreement with the TEM results. Four characteristic peaks one at 3434 cm-1 (broad) and other at 2924, 2853, 1632 cm-1(sharp) have been observed in the FTIR spectra. Intense Blue colour (458 nm) emission has been recorded when crystals are excited with photons of wavelength 254 nm. Non Linear Optical (NLO) properties of the synthesized nanocrystals have been studied. It has been found that second harmonic generation (SHG) efficiency of the prepared samples containing rare earth elements is less than pure Potassium dihydrogen phosphate (KDP) crystals.

Preparation of Waterborne Polyurethane by Bio-Based Polyol and Study of Nanocomposites with Nanocellulose Particles

2020 ◽  
Vol 20 (8) ◽  
pp. 4873-4877
Author(s):  
Soonmo Choi ◽  
Eunjoo Shin
Keyword(s):  
Waterborne Polyurethane ◽  
Xrd Analysis ◽  
Decomposition Temperature ◽  
Sem Analysis ◽  
Regenerated Cellulose ◽  
Initial Modulus ◽  
A Chain ◽  
Average Size ◽  
20 Nm ◽  
Low Crystallinity

In this study, we environment-friendly developed bio-based waterborne polyurethane (BWPU) through the use of both harmless water to human instead of organic solvent and natural castor oil-based polyols. Also, high crystallinity cellulose nanocrystals (CNCs) and regenerated cellulose nanoparticles (RCNs) with low crystallinity as reinforcing agents were prepared through H2SO4 and NaOH/urea methods, respectively. In SEM analysis, we defined that the CNC rod-like particles have a length of 100~200 nm and a width of several tens nm and that the average size of RCNs with round shape was 7~20 nm. It was shown that the crystallinity of CNCs was higher than RCNs’ via FTIR and XRD analysis. In addition, it was found that as the contents of CNCs and RCNs increased, so did the properties of strength, initial modulus, and strain. It could be established that all results mentioned were constituted by the hydrogen bonding between the -OH group of nanocellulose and the -NCO group of BWPU constitutes as well as the role of nanocellulose as a chain extender. Furthermore, the maximum decomposition temperature increased with raising the content of nanocellulose. This tendency was more favorable for CNCs with higher crystallinity than RCNs with low crystallinity.

Green Synthesis of Silver Nanoparticles Using Two Lichens Species: Parmotrema praesorediosum and Ramalina dumeticola

2012 ◽  
Vol 229-231 ◽  
pp. 256-259 ◽  
Author(s):  
Ropisah Mie ◽  
Mohd Wahid Samsudin ◽  
Laily B. Din ◽  
Azizan Ahmad
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Cost Effective ◽  
Green Technology ◽  
Tem Analysis ◽  
Environmental Friendly ◽  
Absorbance Peak ◽  
Average Size ◽  
20 Nm ◽  
First Time

Chemical synthetic method in synthesizing silver nanoparticle was quite expensive, toxic and flammable. In order to enhance green technology, we develop a simple biological method for the green synthesis of silver nanoparticles using two lichens species, Parmotrema praesorediosum and Ramalina dumeticola. Silver nanoparticles were characterized using UV-Vis absorption spectroscopy and TEM. Within 72 hours reaction time, absorption spectra of silver nanoparticles formed in R. dumeticola and P. praesorediosum has absorbance peak at 407 nm and 423 nm, respectively. TEM analysis showed the average size of 20 nm of silver nanoparticles obtained in R. dumeticola and the average size of 42 nm of silver nanoparticles obtained in P. praesorediosum. These two lichens species are able to synthesize silver nanoparticles through green chemistry method, which are environmental friendly and cost effective. This is for the first time that any species of lichens was used for the synthesis of silver nanoparticles.

Structural, Thermal and Electrical Properties of Doped Poly(3,4 ethylenedioxythiophene)

2016 ◽  
Vol 10 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Deepali Kelkar ◽  
◽  
Ashish Chourasia ◽  
◽  
Keyword(s):  
Crystal Structure ◽  
Electrical Properties ◽  
Xrd Analysis ◽  
Structure Modification ◽  
Camphorsulfonic Acid ◽  
Thermal And Electrical Properties ◽  
Ft Ir

Poly(3,4-ethylenedioxythiophene) (PEDOT) was chemically synthesized, undoped and then re-doped using FeCl3 as well as camphorsulfonic acid (CSA). FT-IR results confirm the nature of the synthesized and doped samples. XRD analysis indicates crystal structure modification after doping and was also used to calculate crystallinity of samples. Crystallinity increases after FeCl3 doping, whereas it reduces due to CSA doping. TGA-DTA results show reduction in Tg value for FeCl3 doped sample while it increases for CSA doped samples compared to that of undoped PEDOT. Reduction in Tg indicates plasticizing effect of FeCl3 whereas increase in Tg show anti-plasticizing effect of CSA in PEDOT. Conductivity value () increases by two orders of magnitude after doping. Log vs. 1/T graph show metallic nature of undoped PEDOT above 308 K, however both doped samples show semiconducting nature from 301 to 383 K.

The effect of Tin additionon on Structural and magnetic properties of the stannoferrite Li0.5+0.5XFe2.5-1.5XSnXO4

2016 ◽  
Vol 12 (3) ◽  
pp. 4307-4321 ◽  
Author(s):  
Ahmed Hassan Ibrahim ◽  
Yehia Abbas
Keyword(s):  
Particle Size ◽  
Fine Particles ◽  
Magnetic Moments ◽  
Lithium Ferrite ◽  
Tem Analysis ◽  
Weiss Temperature ◽  
X Ray ◽  
Two Phases ◽  
Nanocrystalline Ferrite ◽  
20 Nm

The physical properties of ferrites are verysensitive to microstructure, which in turn critically dependson the manufacturing process.Nanocrystalline Lithium Stannoferrite system Li0.5+0.5XFe2.5-1.5XSnXO4,X= (0, 0.2, 0.4, 0.6, 0.8 and 1.0) fine particles were successfully prepared by double sintering ceramic technique at pre-sintering temperature of 500oC for 3 h andthepre-sintered material was crushed and sintered finally in air at 1000oC.The structural and microstructural evolutions of the nanophase have been studied using X-ray powder diffraction (XRD) and the Rietveld method.The refinement results showed that the nanocrystalline ferrite has a two phases of ordered and disordered phases for polymorphous lithium Stannoferrite.The particle size of as obtained samples were found to be ~20 nm through TEM that increases up to ~ 85 nmand isdependent on the annealing temperature. TEM micrograph reveals that the grains of sample are spherical in shape. (TEM) analysis confirmed the X-ray results.The particle size of stannic substituted lithium ferrite fine particle obtained from the XRD using Scherrer equation.Magneticmeasurements obtained from lake shore’s vibrating sample magnetometer (VSM), saturation magnetization ofordered LiFe5O8 was found to be (57.829 emu/g) which was lower than disordered LiFe5O8(62.848 emu/g).Theinterplay between superexchange interactions of Fe3+ ions at A and B sublattices gives rise to ferrimagnetic ordering of magnetic moments,with a high Curie-Weiss temperature (TCW ~ 900 K).

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