Synthesis of Silver Nanoparticles in Aqueous Solution: Ionic Liquid Used as a Shape Transformer
Rohit L. Vekariya,
Abhishek Dhar,
Jignesh Lunagariya
Issue:
Volume 1, Issue 1, December 2016
Pages:
1-5
Received:
23 October 2016
Accepted:
14 November 2016
Published:
16 December 2016
DOI:
10.11648/j.css.20160101.11
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Abstract: Silver nanoparticles were synthesized using block copolymer (Pluronic® P123) spherical micelles as a template. In aqueous Ag+ ions may be electrostatically complexed with the anionic surfactant or ionic liquids. The silver ions were reduced in situ by introducing sodium borohydride as a reducing agent. We found that the size of the silver nanoparticles was exclusively depends on the size of block copolymer micelles. Addition of ionic liquid (IL) (1-decyl-3-methyl imidazolium dodecyl sulphate (C10MimDs)) induced sphere – ribbon transition of Silver nanoparticles. The size of the nano ribbon can be tuned by controlling concentration of ionic liquid as well as reducing agents. The silver nanoparticles were observed to be extremely stable in solution suggesting that the modified IL molecules stabilized them. The nanoparticles were characterized by UV-Vis absorbance, dynamic light scattering (DLS) as well as Transmission electron microscope (TEM).
Abstract: Silver nanoparticles were synthesized using block copolymer (Pluronic® P123) spherical micelles as a template. In aqueous Ag+ ions may be electrostatically complexed with the anionic surfactant or ionic liquids. The silver ions were reduced in situ by introducing sodium borohydride as a reducing agent. We found that the size of the silver nanoparti...
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The Choice of Colloid Binder for Pelleting of Molybdenite Concentrate
Vitaliy Guro,
Edgor Safarov,
Matluba Ibragimova,
Zuhra Kadirova
Issue:
Volume 1, Issue 1, December 2016
Pages:
6-9
Received:
31 October 2016
Accepted:
29 November 2016
Published:
27 December 2016
DOI:
10.11648/j.css.20160101.12
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Abstract: Technology of production of the pyrite cinders of molybdenum middlings includes: mixture granulation (composition 1: Mo-concentrate 90%, kaolin 10%; composition 2: Mo-concentrate, 97.3-97.0%, kaolin 2%, SK polymer 0.7%), their firing at 600°C to oxidize sulfide minerals and to recover rhenium oxide. As a result of Mo concentrate mixing with kaolin, a "dilution" of the pyrite cinders with Mo takes place in the case of composition 1. The search of pellet-forming scheme based on alternative to existing compositions binding agents that minimize this rate is of actual importance. A composition for the charge granulation providing light duty of the extraction of Re and Mo from the cinder is created. Its disadvantage is an increased alkalinity of the polymer solution, which leads to adhesion of granules and metal corrosion of the hearth furnace. Objective is to develop organic polymer, devoid of this shortcoming. The approach bases on a comparison of strength and technological characteristics of binders: kaolin and alternative to it of organic nature, being in the composition of pellets and cinder of Mo concentrate is applied. The SK-N product is proposed which is formed when the molar ratio of polyacrylonitrile: NaOH = 1.0: 0.6, in contrast to SK (1.0: 1.0), neutralized to pH 7 with H2SO4. The alternative ashless organic binders are selected for the same purpose: polyacrylamide-GS (PAA-GS) and NH4-CMC. Basing on the PAA-GS a new composition of the charge has been developed, % wt.: Mo concentrate 97.5%, kaolin 2%, polymer PAA-GS 0.5%, devoid of lack of charge with the SK.
Abstract: Technology of production of the pyrite cinders of molybdenum middlings includes: mixture granulation (composition 1: Mo-concentrate 90%, kaolin 10%; composition 2: Mo-concentrate, 97.3-97.0%, kaolin 2%, SK polymer 0.7%), their firing at 600°C to oxidize sulfide minerals and to recover rhenium oxide. As a result of Mo concentrate mixing with kaolin,...
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Simple Synthesis of Vanadium Oxide (V2O5) Nanorods in Presence of CTAB Surfactant
Majid Farahmandjou,
Nilofar Abaeyan
Issue:
Volume 1, Issue 1, December 2016
Pages:
10-13
Received:
25 November 2016
Accepted:
8 December 2016
Published:
16 January 2017
DOI:
10.11648/j.css.20160101.13
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Abstract: Structural and morphological properties of vanadium oxides (V2O5) nanoparticles have been studied. V2O5 nanoparticles were synthesized using a simple chemical method by sodium metavanadate as precursor and Cetyltrimethylammonium bromide (CTAB) as surfactant. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM) and X-ray diffraction (XRD). As there are many forms of vanadium oxides produced during this process, x-ray diffraction (XRD) technique was used to identify V2O5 phase. The size of as-prepared nanoparticles was around 5 nm as estimated by HRTEM technique and average diameter of annealed one was around 9 nm. The surface morphological studies from SEM depicted the formation of nanorods after annealing process. The effect of CTAB surfactant on the particle morphology was also studied and the results show that the size of particles reduce to 10 nm in presence of CTAB surfactant. FTIR spectrum shows the presence of V-O and V-O-V stretching mode of V2O5. The UV–vis absorption show the small band gap is found to be 2.20 eV.
Abstract: Structural and morphological properties of vanadium oxides (V2O5) nanoparticles have been studied. V2O5 nanoparticles were synthesized using a simple chemical method by sodium metavanadate as precursor and Cetyltrimethylammonium bromide (CTAB) as surfactant. The samples were characterized by high resolution transmission electron microscopy (HRTEM),...
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Green Synthesis of Silver Nanoparticles from a Novel Medicinal Plant Source Roots Extract of Mukia maderaspatana
V. Subha,
S. Kirubanandan,
S. Renganathan
Issue:
Volume 1, Issue 1, December 2016
Pages:
14-17
Received:
2 December 2016
Accepted:
19 December 2016
Published:
16 January 2017
DOI:
10.11648/j.css.20160101.14
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Abstract: This letters informs the novel work on aqueous extract of Mukia maderaspatana used for the biotransformation of metallic silver ion into zerovalent silver nanoparticles. This medicinal plant contains medicinal valuable compounds such as polyphenols, flavonoids, Vitamin C, E, proteins and polysaccharides. These medicinal compounds are responsible for the bioreduction of AgNO3 into silver nanoparticles (AgNPs). The synthesised AgNPs were characterized by UV-vis spectroscopy, FTIR, XRD, SEM and TEM analysis. The biosynthesised silver nanoparticle has potential applications in biomedical and biosensor field.
Abstract: This letters informs the novel work on aqueous extract of Mukia maderaspatana used for the biotransformation of metallic silver ion into zerovalent silver nanoparticles. This medicinal plant contains medicinal valuable compounds such as polyphenols, flavonoids, Vitamin C, E, proteins and polysaccharides. These medicinal compounds are responsible fo...
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