Synthesis of CdS Nanoparticles by Sonochemical Reaction Using Thioasetamide as S2− Reservoir and in the Presence of a Neutral Surfactant, Dyeing of Cotton Fabric and Study of Antibacterial Effect on Cotton Fabric

2012 ◽  
Vol 622-623 ◽  
pp. 851-854 ◽  
Author(s):  
Masoumeh Tabatabaee ◽  
Paria Baziari ◽  
Navid Nasirizadeh ◽  
Hamed Dehghanizadeh
Keyword(s):  
Antibacterial Activity ◽  
Cotton Fabric ◽  
Average Particle Size ◽  
Cds Nanoparticles ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Simple Method ◽  
E Coli ◽  
Sonochemical Reaction ◽  
Face Centered

Nano-sized cadmium sulfid (CdS) was synthesized successfully by a simple method using ultrasonic irradiation in the presence of polyethylene glycol (PEG 2000). X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to characterize the structure and morphology synthesized powder. The nanocrystaline of β-CdS was grown in face-centered cubic. The average particle size of synthesized CdS is ~25 nm. CdS suspensions have then been impregnated on cotton-based textile samples and the antibacterial activity of so-functionalized textiles has been studied with respect to E. coli. Results shows that CdS nanoparticles exhibit a strong antibacterial activity and can inhibit 97% of growth E. coli bacteria.

scholarly journals Synthesis and Characterization of Hexadecylamine Capped ZnS, CdS, and HgS Nanoparticles Using Heteroleptic Single Molecular Precursors

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Peter A. Ajibade ◽  
Jejenija Osuntokun
Keyword(s):  
Single Molecule ◽  
Hexagonal Phase ◽  
Average Particle Size ◽  
Cds Nanoparticles ◽  
Cubic Phase ◽  
Average Particle ◽  
Particle Sizes ◽  
Face Centered Cubic ◽  
Molecular Precursors ◽  
Face Centered

Zn(II), Cd(II), and Hg(II) complexes of tetramethyl thiuram disulfides and 1-ethoxylcarbonyl-1-ethylenecarbonyl-2-dithiolate were synthesized and characterized by elemental analysis, FTIR, and1H- and13C-NMR spectroscopy. The complexes were thermolysed in hexadecylamine as single molecule precursors to prepare HDA capped ZnS, CdS, and HgS nanoparticles. The optical and structural properties of the nanoparticles are reported. ZnS nanoparticles existed in the hexagonal phase with particle sizes of 8–15 nm; the CdS nanoparticles in the cubic phase have particle sizes in the range 4–7 nm and the HgS nanoparticles indexed to face-centered cubic phase have an average particle size of 7–12 nm.

Microstructure Characterization of Ag Nanoparticles Prepared by Hydrothermal Method

2012 ◽  
Vol 476-478 ◽  
pp. 1138-1141
Author(s):  
Zhi Qiang Wei ◽  
Qiang Wei ◽  
Li Gang Liu ◽  
Hua Yang ◽  
Xiao Juan Wu
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Hydrothermal Method ◽  
Ag Nanoparticles ◽  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Face Centered

Ag nanoparticles were successfully synthesized by hydrothermal method under the polyol system combined with traces of sodium chloride, Silver nitrate(AgNO3) and polyvinylpyrrolidone (PVP) acted as the silver source and dispersant respectively. The samples by this process were characterized via X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption equation, transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED) to determine the chemical composition, particle size, crystal structure and morphology. The experiment results indicate that the crystal structure of the samples is face centered cubic (FCC) structure as same as the bulk materials, The specific surface area is 24 m2/g, the particle size distribution ranging from10 to 50 nm, with an average particle size about 26 nm obtained by TEM and confirmed by XRD and BET results.

scholarly journals THE GREEN SYNTHESIS OF SILVER NANOPARTICLES OF ONION DNA AND SCREENING FOR IN VITRO ANTITYROSINASE ACTIVITY

2019 ◽  
pp. 271-275
Author(s):  
SNEHA THAKUR ◽  
KRISHNA MOHAN G
Keyword(s):  
Silver Nanoparticles ◽  
Nitrate Solution ◽  
Average Particle Size ◽  
Research Work ◽  
Local Market ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Antityrosinase Activity ◽  
Cubic Structure ◽  
Face Centered

Objective: The main objective of the research work is to evaluate the antityrosinase potential of onion DNA silver nanoparticles (AgNPs). Methods: The onions were procured from the local market and DNA was extracted from onions using detergent and methylated spirit. The isolated DNA was selected for synthesis of AgNPs which acts as capping and reducing agent. About 10 ml of the DNA extract was added to 90 ml of 0.1 N silver nitrate solution. After 24 h incubation, the solution turned dark brown, which indicates the formation of AgNPs. The synthesized DNA AgNPs were characterized by ultraviolet-visible, Fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and dynamic light scattering (DLS) studies. Results: The results revealed that the particles were uniform in shape with face-centered cubic structure. The particles are 153±20.4 nm in size and were no signs of agglomeration measured by DLS studies. The FTIR spectroscopy revealed B form of DNA along with strong N-H stretching, C=N stretching, and also asymmetric vibrations of phosphate groups characteristic for DNA molecule. The XRD studies revealed the face-centered cubic structure. SEM studies revealed the spherical structure with average particle size of 150±0.1 nm for single DNA nanoparticles. The onion DNA AgNPs were further investigated for its antityrosinase activity against the standard kojic acid and were to have anticancer potential nearer to the standard. Conclusion: From the results, it is evident that the synthesized onion DNA AgNPs have antityrosinase potential and can be further investigated for in vivo anticancer potential in future.

Study on Nickel Nanopowders Prepared by Arc Plasma

2013 ◽  
Vol 734-737 ◽  
pp. 1555-1558
Author(s):  
Cong Hua Hou ◽  
Yun Ge Chen
Keyword(s):  
Particle Size ◽  
Average Particle Size ◽  
Barometric Pressure ◽  
Constant Current ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Arc Plasma ◽  
X Ray Diffraction ◽  
Current Voltage ◽  
Face Centered

In order to prepare the nickel nano-metal with high purity and uniform particle size , the arc plasma method was used. The nano-Ni was got under a constant current , voltage , barometric pressure, hydrogen and argon gas . The nickel nanopowders were tested through the Scan Electron Microscope (SEM ), X-ray diffraction (XRD), Laser Sizer Analysis (LSA). The results indicated that the feature of the nickel nanopowders were mainly spherical, smooth surface. The nickel powder particle distribute from 40 to 80nm. And average particle size is 60nm. Nanocrystals had a better internal crystallinity. The crystal structure is face-centered cubic FCC structure, the same as ordinary nickel nanoparticles .

scholarly journals BIOREDUCTION AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM OIL PALM EMPTY FRUIT BUNCH

2020 ◽  
Vol 21 (4) ◽  
pp. 177
Author(s):  
Siti Suhartati ◽  
Iwan Syahjoko Saputra ◽  
Dwinna Rahmi ◽  
Yoki Yulizar ◽  
Sudirman Sudirman
Keyword(s):  
Silver Nanoparticles ◽  
Oil Palm ◽  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Empty Fruit Bunch ◽  
The Face ◽  
Face Centered ◽  
Average Size

BIOREDUCTION AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM OIL PALM EMPTY FRUIT BUNCH (OPEFB). The synthesis of silver nanoparticles was successfully carried out by extracting oil palm empty fruit bunch. The precursor used was silver nitrate (AgNO3) with a concentration of 9x10-4 M and 5 wt% of the oil palm empty fruit bunch extract. OPEFB acted as a capping agent in the synthesis of silver nanoparticles. The bioreduction method Ag+ to Ag0 produced a silver nanoparticle colloid in brown color. The results of the UV-Vis spectrophotometer showed the silver nanoparticles colloids spectrum at a wavelength of 420 nm with an absorbance value of 0.5. FTIR shows the reduction and shift of absorption peak in the hydroxyl functional group (-OH) at wavenumbers of 3323 cm-1 and the presence of absorption peaks at 560 cm-1. While, XRD pattern showed the specific crystallinity peaks of silver nanoparticles at 2θ: 33.24°; 39.98°; 61.23°; dan 79.13° respectively with the face-centered cubic crystal structure (FCC) and crystallite size of 15 nm. PSA analysis showed two specific peaks with an average size distribution silver nanoparticles of 43.5 nm and a PDI value of 0.4. Analysis of TEM shows the average particle size of 20 nm with a spherical particle shape.

Simple One-Step Synthesis of Uniform Disperse Copper Nanoparticles

2005 ◽  
Vol 879 ◽  
Author(s):  
Chunwei Wu ◽  
Brian P. Mosher ◽  
Taofang Zeng
Keyword(s):  
Ascorbic Acid ◽  
Copper Nanoparticles ◽  
Chemical Reduction ◽  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Chemical Reduction Method ◽  
Disperse Copper ◽  
One Step ◽  
Face Centered

AbstractIn this paper, we describe a simple and rapid solution-phase chemical reduction method with no inert gas protection, for preparing stable copper nanoparticle colloid with average particle size of 3.4 nm and narrow size distribution. In our synthesis route, ascorbic acid, natural vitamin C (VC), serves as both a reducing agent and an antioxidant to reduce copper salt precursor and effectively prevent the general oxidation process occurring to the newborn nanoparticles. XRD and UV/vis confirm the formation of pure face-centered cubic (fcc) copper nanoparticles and the excellent antioxidant ability of ascorbic acid.

scholarly journals Development and Characterization of Polyphenon 60 and Caffeine Microemulsion for Enhanced Antibacterial Activity

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Sonal Gupta ◽  
Rakhi Bansal ◽  
Javed Ali ◽  
Reema Gabrani ◽  
Shweta Dang
Keyword(s):  
Antibacterial Activity ◽  
Mammalian Cells ◽  
Average Particle Size ◽  
Natural Compounds ◽  
Average Particle ◽  
Tem Analysis ◽  
E Coli ◽  
Vero Cell Line ◽  
Effective Delivery ◽  
The Individual

Green tea catechins and caffeine have exhibited antibacterial activity; however, their use is limited by lack of stability and effective delivery systems. Polyphenon 60 (P60) and caffeine were encapsulated in a single microemulsion (ME) formulation with an objective to lower the minimum inhibitory concentrations (MICs) of the individual agents against selected pathogens (S. epidermidisandE. coli). Combination of two natural compounds would advocate two different mechanisms on the bacterial growth thereby providing for better antibacterial activity. Thermodynamically stable ME was developed and characterized with an average particle size of 17.58 nm, further confirmed by TEM analysis. Antibacterial studies included chequerboard microdilution assay to determine the MIC and fractional inhibitory concentration (FIC) of both the natural compounds individually and in combination. MIC and FIC results indicated that the combination of the above two natural compounds was proficient in lowering the MICs of individual agents. Results of DPPH assay indicated that ME system preserved the long term antioxidative potential of P60 and caffeine. The cytotoxicity of the optimized formulation on Vero cell line by MTT assay was found to be nontoxic to mammalian cells.

Influence of Ethanol Catalyzed Oxidation on the Activity of Pd/C with Different Ratio of Pd and Carbon

2013 ◽  
Vol 860-863 ◽  
pp. 835-838
Author(s):  
Zhong Xu Dai ◽  
Dan Ni Tian ◽  
Xin Zhang ◽  
Si Lin Gong ◽  
Chang Ying Yang
Keyword(s):  
Ethanol Oxidation ◽  
Chemical Reduction ◽  
Average Particle Size ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Face Centered ◽  
Catalyzed Oxidation ◽  
Better Than

To investigate the influence of ethanol catalyzed oxidation on activity of Pd/C with different ratio of Pd and C. Pd/C catalyst samples with Pd loads of 20, 30, 40 and 50 wt% were obtained by chemical reduction reaction of PdCl2 and NaBH4. The samples morphology and structure were characterized by XRD and SEM. The electrocatalytic oxidation activities of ethanol were examined by cyclic voltammetry in alkaline media. The results show that a face centered cubic (FCC) Pd phase can be identified in the sample powders. The average particle size of the Pd/C powder is about 10 nm. The performance of ethanol oxidation on 40 % Pd/C electro-catalyst is better than that of the other Pd/C samples.

scholarly journals Synthesis of Nano Silver using Bioreductor of Tristaniopsis merguensis Leaf Extracts and Its Antibacterial Activity Test

2019 ◽  
Vol 4 (3) ◽  
pp. 172
Author(s):  
Verry Andre Fabiani ◽  
Megawati Ayu Putri ◽  
Marhan Ebit Saputra ◽  
Della Puspita Indriyani
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Leaf Extract ◽  
Average Particle Size ◽  
Xrd Analysis ◽  
Average Particle ◽  
Leaf Extracts ◽  
Nano Silver ◽  
E Coli ◽  
Activity Test

<p>Synthesis nanosilver from <em>pelawan</em> leaf extract <em>(Tristaniopsis merguensis)</em> has been carried out. The variables of this study were variations in the concentration of AgNO<sub>3</sub> 1 mM, 1.5 mM and 2 mM. Pelawan leaf extract acted as a bioreductor that converts Ag<sup>+</sup> to Ag<sup>0</sup>. The synthesis was carried out in a ratio of 1: 4 (opposition leaf extract: AgNO<sub>3</sub> solution) at 70 °C for 1.5 hours. The results of the UV-Vis analysis showed the maximum at the 1 mM; 1.5 mM; 2 mM AgNO<sub>3 </sub>concentration were 391 nm, 392 nm and 400 nm, respectively. XRD analysis explained that the resulting nanosilver was crystalline and according the Scherrer equation an average particle size was of 22.8 nm. The antibacterial activity test of nanosilver was carried out by disc method, nanosilver showed the existence of strong antibacterial activity against <em>E. coli</em> and <em>S. aureus</em> bacteria.</p><p>.</p>

Porous NiO-SDC Carbonates Composite Anode for LT-SOFC Applications Produced by Pressureless Sintering

2011 ◽  
Vol 52-54 ◽  
pp. 488-493 ◽  
Author(s):  
Raharjo Jarot ◽  
Andanastuti Muchtar ◽  
Wan Ramli Wan Daud ◽  
Norhamidi Muhamad ◽  
Edy Herianto Majlan
Keyword(s):  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Weight Percentage ◽  
Composite Anodes ◽  
Optimum Porosity ◽  
Face Centered ◽  
Two Phases ◽  
Cold Pressed

Composite anodes made of NiO and SDC-(Li/Na)2CO3 were investigated in relation to their structure, morphology, and porosity. As a first step, the anode powder was prepared by mixing the NiO with SDC-(Li/Na)2CO3 via solid state reaction in weight percentage of 60 : 40 wt% and in various compositions of carbonates (20 and 30wt%), namely NiO-SDC8020 and NiO-SDC7030, respectively. The powder mixtures were then calcined at 680oC. The resultant powder was fine with surface area of about 13.10-13.70 m2/g and an average particle size of 0.32-0.37µm. The powders consist of two phases i.e. the cubic NiO and face-centered cubic structure SDC-(Li/Na)2CO3 as confirmed with x-ray diffraction. The microstructures were observed under scanning electron microscopy (SEM). The anode pellets were later compacted at different pressures (27, 32 and 37 MPa) and sintered at 600oC. The optimum porosity (20.99-24.78%) was achieved for samples of NiO-SDC8020 and NiO-SDC7030 sintered at 600oC and cold pressed at 32 and 37 MPa.

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