scholarly journals Formation of Eco-friendly Silver Nanoparticle Microalgae using Chlorella vulgaris

2019 ◽  
Vol 24 (1) ◽  
pp. 7
Author(s):  
Hermin Pancasakti Kusumaningrum ◽  
Muhammad Zainuri ◽  
Widianingsih Widianingsih ◽  
Wahyu Dewi Utari Haryanti ◽  
Indras Marhaendrajaya ◽  
...  
Keyword(s):  
Antimicrobial Agent ◽  
Silver Nanoparticle ◽  
Chemical Elements ◽  
Research Result ◽  
Sem Analysis ◽  
Spherical Form ◽  
Tem Analysis ◽  
Edx Analysis ◽  
Transmission Electron ◽  
Uv Visible

Biosynthesized silver nanoparticles (AgNPs) using organism have spurred great interest as a antimicrobial and biomedical agents. Green microalgae have advantages as they are easily available, grow rapidly and producing varieties metabolites. Synthesized of AgNPs from  microalgae C. vulgaris offer environmentally antimicrobial agent. The objectives of the study is producing AgNPs microalgae using C. vulgaris as eco-friendly antimicrobial agent. The research methods was conducted by synthesizing silver nanoparticle microalgae using C. vulgaris following by characterization under UV–visible spectroscopy,  transmission electron microscopy  (TEM), and scanning electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDX). The research result showed AgNPs C. vulgaris microalgae were produced with and without agitation treatment under different condition. The synthesized AgNPs C. vulgaris exhibited a maximum absorption at 312 nm and 398 nm, and EDX analysis had determined that abundance chemical elements presented in a sample were carbon  and silver.  The TEM analysis revealed that they are spherical form. The spot of EDX analysis showed the presence of silver atoms. The SEM analysis shows the spherical shaped with some silver particle inside of the cell. These resut indicated that formation of silver nanoparticle microalgae using C. vulgaris has been succesfully obtained under the treatment. 

scholarly journals Photodegradation of Chloridazon Using Coreshell Magnetic Nanocompsites

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Dina Mamdouh Fouad ◽  
Mona Bakr Mohamed
Keyword(s):  
High Performance ◽  
Magnetic Nanoparticle ◽  
Chemical Methods ◽  
Tem Analysis ◽  
Photodegradation Rate ◽  
Transmission Electron ◽  
Visible Spectra ◽  
Uv Visible ◽  
Particle Size And Shape ◽  
Sun Light

A new synthesized magnetic nanoparticle of Fe3O4and coreshell Fe3O4@Au is prepared chemically. A comparative study between the photocatalytic activity between Fe3O4and core shell Au-Fe3O4nanoparticles has been studied on the effect of UV and sun light on the photodegradation of chloridazon. The particle has been prepared using chemical methods and the particle size and shape have been examined via transmission electron microscopy (TEM). Analysis of the degradation of 20 ppm chloridazon under ultraviolet (UV) and visible light was analyzed with high-performance liquid chromatography (HPLC) and UV-Visible Spectra. Influence of different parameters on the activity photodegradation rate has been studied. The results indicate that the Fe3O4@Au nanoparticles are much more active catalyst in presence of sun light than pure Fe3O4nanomaterials which have maximum absorption at 560 nm.

Synthesis and Characterization of Chitosan-Silver Nanocomposite Film

2016 ◽  
Vol 11 ◽  
pp. 22-29 ◽  
Author(s):  
Olayinka J. Olaniyan ◽  
Enock O. Dare ◽  
Olayide Rasaq Adetunji ◽  
Omolola O. Adedeji ◽  
Shephrah O. Ogungbesan
Keyword(s):  
Nanocomposite Film ◽  
Low Cost ◽  
Scale Up ◽  
Packaging Material ◽  
Uniform Size ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Resonance Band ◽  
Silver Nanocomposite ◽  
Uv Visible

Chitosan is termed as one of the useful carbohydrate oligosaccharides derived from chitin, which can be used to improve film packaging by hybridizing with silver due to their advantages of flexibility, easy scale up and low cost methods. Design of packaging material with non-toxic property becomes key issue. The objective of this work is to synthesize and characterize chitosan-silver nanocomposite film for effective packaging. The nanocomposite was synthesized using in-situ, co-mixing chemical method and air drying method. The morphology integrity of the nanohybrid was confirmed using UV-Visible Spectrophotometer, Transmission Electron Microscope (TEM) and X-ray Diffraction (XRD). TEM analysis revealed the cap shaped spherical morphology with no agglomeration and uniform size distribution of the nanoparticles within the range of 20.00 nm. UV-visible analysis showed Plasmon resonance band at 275 nm and 435 nm indicating the presence of chitosan and silver with no observable peak and an increase in intensity of chitozan. XRD confirmed the order and crystalline peak located at 2θ = 35ᵒ, 64ᵒ and 77ᵒwhich have been keenly indexed as face centred cubic Silver nanocrystals.Thus, the nanocomposite film produced serves as an effective packaging material.

Fabrication of Mesoporous Cerium Dioxide Films by Cathodic Electrodeposition

2007 ◽  
Vol 7 (11) ◽  
pp. 4198-4201 ◽  
Author(s):  
Young-Soo Kim ◽  
Jin-Kyu Lee ◽  
Jae-Hoon Ahn ◽  
Eun-Kyung Park ◽  
Gil-Pyo Kim ◽  
...  
Keyword(s):  
Small Angle ◽  
Cerium Dioxide ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Cubic Phase ◽  
Tem Analysis ◽  
X Ray ◽  
Cathodic Electrodeposition ◽  
Glass Substrates ◽  
Transmission Electron

Mesoporous cerium dioxide (Ceria, CeO2) thin films have been successfully electrodeposited onto ITO-coated glass substrates from an aqueous solution of cerium nitrate using CTAB (Cetyltrimethylammonium Bromide) as a templatingagent. The synthesized films underwent detailed characterizations. The crystallinity of synthesized CeO2 film was confirmed by XRD analysis and HR-TEM analysis, and surface morphology was investigated by SEM analysis. The presence of mesoporosity in fabricated films was confirmed by TEM and small angle X-ray analysis. As-synthesized film was observed from XRD analysis and HR-TEM image to have well-crystallized structure of cubic phase CeO2. Transmission electron microscopy and small angle X-ray analysis revealed the presence of uniform mesoporosity with a well-ordered lamellar phase in the CeO2 films electrodeposited with CTAB templating.

scholarly journals Optical Studies of Organically Functionalized Mn doped ZnS Quantum Dots

2021 ◽  
Vol 33 (12) ◽  
pp. 2972-2976
Author(s):  
Anju Bala ◽  
Rajeev Sehrawat ◽  
Renu Bala ◽  
Ashutosh Dixit
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement Effect ◽  
Emission Spectra ◽  
Blue Shift ◽  
Capping Agent ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Uv Visible ◽  
Mn Doped

Organically functionalized manganese doped zinc sulfide (ZnS/Mn) quantum dots were prepared by simple chemical method with polypyrrole (PPy) used as a capping agent. Prepared quantum dots were characterized with Fourier transform infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HR-TEM), X-ray diffraction microscope (XRD), UV-visible spectroscopy and photoluminescence spectroscopy. Crystalline size of PPy capped ZnS/Mn quantum dots for various concentrations of PPy were approximate 2 nm as analyzed by XRD and TEM analysis. The absorption spectra revealed the occurrence of a blue shift in the peak of absorption and an increase in the band gap value due to the quantum confinement effect. FTIR spectroscopy confirmed that shifting of broad peak at 2335.8 cm–1 was due to S-H stretching vibrations, which confirmed interaction of hydrogen and sulphur in ZnS/Mn/PPy nanocomposites. Uncapped ZnS/Mn and PPy capped ZnS/Mn quantum dots reveal the effective photoluminescence emission spectra in the range of 300-700 nm. With increase the value of capping agent in ZnS/Mn quantum dots, photoluminescence spectra going to red shifting. The photoluminescence properties of the organically functionalized ZnS nanoparticles are favourable for the application in optoelectronic devices.

Silver Doped Nano-Sized Bioglass Ceramics: Synthesis, Characterization and Biocompatibility Studies

2016 ◽  
Vol 860 ◽  
pp. 25-28 ◽  
Author(s):  
Chinnasamy Ramaraj Mariappan ◽  
Narender Ranga
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
X Ray Diffraction ◽  
Bending Vibrations ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Visible Spectra ◽  
Calcium Phosphosilicate ◽  
Uv Visible

We report on the structural and biocompatibility properties of nanosized calcium phosphosilicate bioglass ceramics doped with 0, 2, 4 and 6 mol% Ag2O. Silver doped bioceramics were synthesized by sol-gel method. The prepared samples were characterized by means of powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-visible and high resolution transmission electron microscopy. The XRD reveals the glass-ceramic nature of the samples. The FT-IR spectra show the possible stretching and bending vibrations of silicate and phosphate groups. Absorptions in UV-visible spectra reveal the silver embedment as Ag+/Ago form into the glass matrix. nanosize of the glass ceramics is confirmed by HR-TEM analysis. The bioactivity of silver doped bioceramics was investigated by in-vitro method with Dulbecco’s Modified Eagel’s Medium. It confirms the formation of bone-like hydroxylapatite layer formation on the surface of bioceramics.

A Comparison of AFM, SEM, and TEM Analysis of AL/SI/CU Thin Films

1992 ◽  
Vol 260 ◽  
Author(s):  
K. L. Westra ◽  
D. J. Thomson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Finite Size ◽  
Sem Analysis ◽  
Tem Analysis ◽  
Cu Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Sputter Deposited

ABSTRACTAtomic Force microscopy, scanning electron microscopy, and transmission electron microscopy was used to study Al/Si/Cu films sputter deposited at 2 and 45 mTorr. AFM and SEM analysis shows the films to consist of columnar structures commonly seen in PVD deposited thin films, while the TEM analysis showed the films be polycrystalline. Comparing the columnar structures seen in the AFM and SEM study to the grains found in the TEM study, we conclude that the columns consist of single grains. Thus for these films AFM or SEM analysis can be used to determine the grain size. Finally, an AFM scan of a Al/Si/Cu deposited via was performed. The AFM image clearly shows the high resolution of the AFM, while it also illustrates the problems caused by the finite size of the AFM tip.

Green Synthesis of Silver Nanoparticles using Ajuga parviflora Benth and Digera muricata Leaf extract: Their Characterization and Antimicrobial Activity

2020 ◽  
Vol 71 (10) ◽  
pp. 50-57
Author(s):  
Kamran Mehdi ◽  
Wajid Rehman ◽  
Obaid-Ur-rahman Abid ◽  
Srosh Fazil ◽  
Muhammad Sajid ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
State Of The Art ◽  
Sem Analysis ◽  
Bacterial Strains ◽  
Transmission Electron ◽  
Protein Amino Acids ◽  
Uv Visible ◽  
Average Size

The aim of the present study is to search out nontoxic silver nanoparticles synthesized from the leaf extract of two plants Ajuga parviflora Benth and Digera muricata for antimicrobial activity. The plants used in this investigation are rich in alkaloids, flavonoids, steroids, terpenoids, protein, amino acids, carbohydrate, quninones, phenols and tannins. The formation of nanoparticles were confirmed by UV/Visible spectroscopy, peaks at 423nm for Ajuga parviflora Benth and 408nm for Digera muricata. The morphology of the silver nanoparticles was established through state of the art spectroscopic tools. SEM analysis reveals average size of AgNPs 18 nm for Digera muricata and 22 nm for Ajuga parviflora Benth respectively while transmission electron microscopy confirms that AgNPs are spherical in shape. The synthesized nanoparticles were subjected to Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Pseudomonas aeruginosa. The results suggest that the silver nanoparticles have promising activity against all the bacterial strains and can be used an effective bactericides.

Preparation of Polyacrylate/ZnO Nanocomposite

2011 ◽  
Vol 694 ◽  
pp. 430-434 ◽  
Author(s):  
Jun Li Liu ◽  
Jian Zhong Ma ◽  
Yan Bao ◽  
Zhen Feng Zhu ◽  
Yi Hong Liu ◽  
...  
Keyword(s):  
Water Absorption ◽  
Sol Gel ◽  
Sem Analysis ◽  
Transmission Electron Micrograph ◽  
Forming Process ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Film Forming ◽  
Electronic Microscope ◽  
Main Material

In this study, ZnO sol was prepared by sol-gel method with zinc acetate, triethanolamine and sodium hydroxide as the main material. Then obtained ZnO sol was directly blended with polyacrylate latex to prepare polyacrylate/ZnO nanocomposite. The effects of ZnO sol contents on the mechanical properties and water absorption of polyacrylate/ZnO nanocomposite were investigated in details. The results showed tensile strength of polyacrylate/ZnO nanocomposite reduced, and water absorption of it increased with the increasing of ZnO sol. Transmission electron micrograph (TEM) analysis indicated ZnO sol dispersed uniformly and the size of it was about 20nm. Scanning electronic microscope (SEM) analysis showed ZnO sol and polyacrylate have good compatibility, however, ZnO sol would condensate and form short rods structure during the film forming process.

Controlling the Absorption of Gold Nanoparticles via Green Synthesis Using Sargassum crassifolium Extract

2018 ◽  
Vol 765 ◽  
pp. 44-48 ◽  
Author(s):  
Angeline F. Maceda ◽  
Johnny Jim S. Ouano ◽  
Mar Christian O. Que ◽  
Blessie A. Basilia ◽  
Melchor J. Potestas ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Ftir Spectroscopy ◽  
Capping Agent ◽  
Visible Spectroscopy ◽  
Spectroscopy Analysis ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Uv Visible

This work controls the absorption of gold nanoparticles (GNPs) via green synthesis utilizingSargassumcrassifoliumextract. The amount of seaweed extract acts as both reducing (from Au+to Au0) and capping agent. TheS.crassifoliumextract is mainly composed of biomolecules such as protein and phenolic compounds which are responsible for the synthesis of GNPs. The synthesized GNPs were characterized using UV-Visible spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and Transmission Electron Microscopy (TEM). UV-Vis spectra revealed peaks around 505 nm to 544 nm which corresponds to the Surface Plasmon Resonance (SPR) of GNPs. FTIR spectroscopy analysis showed peak at 825 cm-1and 1144 cm-1which corresponds to the signature peaks of GNPs. Polydisperse GNPs with varied sizes (between 5 nm to 300 nm) were further confirmed by TEM analysis.

scholarly journals Structural, Optical, Electrical and Photocatalytic Degradation Properties of Cadmium Sulfide Nanopaticles by Sol Gel Methodd

2020 ◽  
Vol 32 (9) ◽  
pp. 2347-2355
Author(s):  
M. SANKAR ◽  
M. JOTHIBAS ◽  
A. MUTHUVEL ◽  
B. ARUN KUMAR
Keyword(s):  
Electron Microscopy ◽  
Cadmium Sulfide ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Cds Nanoparticles ◽  
Potential Candidate ◽  
Morphological Transformation ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Uv Visible

Cadmium sulfide (CdS) nanoparticles were synthesized via inexpensive sol gel method at different sintering temperature (350, 400 and 450 °C). The synthesized CdS nanoparticles have been characterized by X-ray diffraction, UV-visible spectroscopy, photoluminescence spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy and Fourier transform infrared spectroscopy. The XRD pattern confirmed the formation of hexagonal Wurtzite structure for all the sintering temperatures. The crystallite size, microstrain and dislocation density have been evaluated using XRD data. SEM and HR-TEM analysis showed morphological transformation with better crystallite and spherical shaped CdS nanoparticles were observed. EDS is also performed to confirm the elemental composition of CdS nanoparticles. FT-IR analysis identified the absorption peaks of the Cd-S extension with moisture content. The UV-visible spectra showed absorption peak in the range of 223-257 nm and optical band gap decrease with increase of sintering temperatures. In addition the synthesized CdS nanoparticles were effectively used to degrade methyl orange dye under sunlight irradiation. The CdS nanoparticles were the potential candidate for optoelectronic applications.

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