scholarly journals Preparation and Characterization of Silver Nanospheroids: Theoretical and Experimental Approaches

2017 ◽  
Vol 9 (2) ◽  
pp. 63 ◽  
Author(s):  
Mounira Amraoui ◽  
Chouaib Daoudi ◽  
Mohamed Remram
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Shape Control ◽  
Size Structure ◽  
Spectroscopic Characterization ◽  
Dipole Approximation ◽  
Absorption Bands ◽  
Chemical Route ◽  
Continuous Precipitation

We synthesized silver nanoparticles of different sizes and forms as function of the molar masses of AgNO3, in two different solvent mediums (ethanol, methanol). We carried out the synthesis according to standard chemical route with major modifications. The spectroscopic characterization showed the presence of two distinct absorption bands; the first band at 300 nm and the second shifted to 440 nm. We found a multipolar phenomenon depending on the temperature. The shape and size predicted by the numerical model are conform to the experimental results. The study demonstrated that the nanoparticles have a spheroidal shape. Full Text: PDF ReferencesCecilia Noguez, "Surface Plasmons on Metal Nanoparticles: The Influence of Shape and Physical Environment", J. Phys. Chem. C 111(10), 3806 (2007). CrossRef M. Amraoui , C. Daoudi and M. Remram, Int.Sc.Sci and Tech. Conf. 2015 Ayd?n,Turkey , 11-13 May , 2015 (ISSTC 2015).M. I Gonzalez-Sanchez et al, "Silver nanoparticle based antibacterial methacrylate hydrogels potential for bone graft applications", Mater. Sci. Eng C. Mater. Biol. Appl 50, 332 (2015). CrossRef Xinyi Dong et al, "Shape Control of Silver Nanoparticles by Stepwise Citrate Reduction", J. Phys. Chem. C 113(16), 6573 (2009). CrossRef A. Wolak, M. Grabiec, O. Véron, J. ?P. Blondeau and K. Dzierżęga, "Nanosecond infrared laser-induced precipitation of silver nanoparticles in glass", Phot. Lett. Poland 5(2), 54 (2013). CrossRef A. Zielinska, E. Skwarek, A. Zaleska, M. Gazda and J. Hupka, "Preparation of silver nanoparticles with controlled particle size", Procedia Chemistry 1, 1560 (2009). CrossRef K-S.Chou, Y.Chang and L. Hua, "Studies on the Continuous Precipitation of Silver Nanoparticles", Ind.Eng.Chem.Res 51(13) 4905 (2012). CrossRef A. M. Atta, H. A. Al-Lohedan, A. O. Ezzat, "Synthesis of Silver Nanoparticles by Green Method Stabilized to Synthetic Human Stomach Fluid", Molecules 19(5) 6737 (2014). CrossRef Botasini, S, Méndez, E. "Silver nanoparticle aggregation not triggered by an ionic strength mechanism", J Nanopart Res 15, 1526 (2013). CrossRef V. Amendola, O.M. Bakr, F. Stellacci, "A Study of the Surface Plasmon Resonance of Silver Nanoparticles by the Discrete Dipole Approximation Method: Effect of Shape, Size, Structure, and Assembly", Plasmonics 5(1) 85 (2010). CrossRef L. Jeong, W. Ho Park "Preparation and Characterization of Gelatin Nanofibers Containing Silver Nanoparticles", Int. J. Mol. Sci 15, 6857 (2014). CrossRef Peter Monk, Finite element method for Maxwell's equations, (Oxford, Clarendon Press 2003). DirectLinkM.D. Abramoff, P.J. Magalhaes, S.J. Ram, "Image processing with ImageJ", Biophotonics International 11(7), 36 (2004). DirectLink Edward D.Palik, Handbook of optical constants of solids (California, Academic Press Inc, 1985). DirectLink

Diffuse Reflectance Infrared Spectroscopic Characterization of Silica Dehydroxylation

1990 ◽  
Vol 44 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Robert L. White ◽  
Aurobindo Nair
Keyword(s):  
Force Constant ◽  
Diffuse Reflectance ◽  
Spectroscopic Characterization ◽  
Absorption Bands ◽  
Stretching Vibration ◽  
Diffuse Reflectance Infrared ◽  
Highly Strained ◽  
Infrared Absorption Bands ◽  
Absorbance Band

Diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) is employed to study the dehydroxylation of amorphous silica. Dehydroxylation results in the appearance of infrared absorption bands at 1022, 1107, and 1240 cm−1 assigned to asymmetric stretching vibrations for three different siloxane bridge types. The 1107-cm−1 absorbance band represents a siloxane bridge that is indistinguishable from bulk species. The 1022-cm−1 absorbance band represents a siloxane bridge with a bond angle that is smaller than the bulk, with little change in the stretching vibration force constant. The 1240-cm−1 absorbance band derives from a siloxane bridge characterized by a stretching force constant significantly larger than that of bulk siloxane bridges. This band may be indicative of a highly strained or broken siloxane bridge.

scholarly journals Phytochemical Synthesis and Preliminary Characterization of Silver Nanoparticles Using Hesperidin

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Anish Stephen ◽  
Sankar Seethalakshmi
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Reaction Time ◽  
Silver Nanoparticle ◽  
Size Range ◽  
Transmission Electron ◽  
Vis Spectroscopy

This paper is the first of its kind for development of rapid and ecofriendly method for synthesis of silver nanoparticles from aqueous solution of silver nitrate using the flavonoid “hesperidin” and optimization of the methodology. There is formation of stable spherical silver nanoparticles in the size range of 20–40 nm. Optimization of methodology in terms of concentration of reactants and pH of the reaction mixture reduced the reaction time for silver nanoparticle formation to 2 mins. Silver nanoparticles (AgNPs) were characterized by UV-Vis spectroscopy and transmission electron microscopy (TEM). UV-vis spectroscopy derived spectrum demonstrated a peak of 430 nm which corresponds to the plasmon absorbance of silver nanoparticles. Transmission electron microscopy revealed spherical shaped silver nanoparticles in the size range of 20–40 nm.

scholarly journals Silver nanoparticle – poly (n-isopropylacrylamide) conjugate preparation: biological and chemical characterization studies of the conjugates

2021 ◽  
Vol 23 (09) ◽  
pp. 320-339
Author(s):  
Basil Baby ◽  
◽  
Maya Devi S ◽  
Keyword(s):  
Wound Healing ◽  
Silver Nanoparticles ◽  
Organic Compounds ◽  
Silver Nanoparticle ◽  
Spectroscopic Analysis ◽  
Chemical Characterization ◽  
Life Saving ◽  
Characterization Studies

Conjugation of nanoparticles with organic compounds are performed to enhance the activity and to increase their stability. This property would aid in developing different life saving biomedical products. Based on this objective, silver nanoparticle – poly (N-isopropylacrylamide) conjugate was developed with the aim of investigating its wound healing ability and biocompatibility in the present study. Chemical characterization of developed silver nanoparticles was also studied using FESEM and UV spectroscopic analysis.

Biogenic synthesis and spectroscopic characterization of silver nanoparticles using leaf extract of Indoneesiella echioides: in vitro assessment on antioxidant, antimicrobial and cytotoxicity potential

2015 ◽  
Vol 6 (7) ◽  
pp. 973-982 ◽  
Author(s):  
Gunaseelan Kuppurangan ◽  
Balaji Karuppasamy ◽  
Kanipandian Nagarajan ◽  
Rajkumar Krishnasamy Sekar ◽  
Nilmini Viswaprakash ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Spectroscopic Characterization ◽  
Biogenic Synthesis ◽  
In Vitro Assessment

Spectroscopic characterization of synthetic heteroatom-functionalized fluorescent probes for bioimaging / Sentetik heteroatom-fonksiyonelize floresans probların biyogörüntüleme uygulamaları için spektroskopik karakterizasyonu

2015 ◽  
Vol 40 (5) ◽  
Author(s):  
Özlem Dilek
Keyword(s):  
Fluorescent Probes ◽  
Emission Spectra ◽  
Spectroscopic Characterization ◽  
Spectroscopic Properties ◽  
Absorption Bands ◽  
Broad Absorption ◽  
Cellular Environment ◽  
Boron Dipyrromethene ◽  
Biological Labeling

AbstractObjective: Fluorescent probes are essential tools for monitoring biological systems in cellular environment. Several boron dipyrromethene (BODIPY) derived fluorescent probe derivatives have been synthesized by nucleophilic substitution reaction and their spectroscopic properties have also been determined.Methods: Initial BODIPY dye framework was prepared from the reaction of pyrrole-2-carbaldehyde and benzaldehyde and then readily reacted with heteroatom-based nucleophiles at 3- and 5- position of BODIPY core. The spectroscopic properties of these new molecules have been reported.Results: Amine based nucleophiles tend to produce broad absorption bands on the spectra. Our studies indicated that heteroatom-based nucleophiles on the BODIPY core resulted in a red shift on the absorption and emission spectra.Conclusion: The synthesized fluorophores can therefore be potentially used as imaging agents for biological labeling.

Droplet based microfluidics: spectroscopic characterization of levofloxacin and its SERS detection

2015 ◽  
Vol 17 (33) ◽  
pp. 21236-21242 ◽  
Author(s):  
I. J. Hidi ◽  
M. Jahn ◽  
K. Weber ◽  
D. Cialla-May ◽  
J. Popp
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Spectroscopic Characterization ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection

The determination of the absorption behavior of levofloxacin (levaquin) on the surface of silver nanoparticles and its determination in aqueous solution by droplet based microfluidics combined with surface enhanced Raman spectroscopy.

PHYTOSYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES USING CALLUS OF JATROPHA CURCAS: A BIOTECHNOLOGICAL APPROACH

2013 ◽  
Vol 12 (02) ◽  
pp. 1350012
Author(s):  
A. G. DEMISSIE ◽  
S. S. LELE
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Physicochemical Properties ◽  
Silver Nanoparticle ◽  
Jatropha Curcas ◽  
Biotechnological Approach ◽  
Crystalline Nature ◽  
Dispersion Ratio

The present study reports a rapid plant-based biosynthesis of silver nanoparticles using callus extract of Jatropha curcas L. The particle size and morphological analyses were carried out using Zetasizer, SEM, TEM. The physicochemical properties were monitored using UV-Vis spectroscopic, IR and DSC. The formation of silver nanoparticle was confirmed by using UV-Vis spectrophotometer and absorbance peaks at 421 nm. The silver nanoparticle was found to be a negatively charged with size ranging from 2 nm to 50 nm. The morphology of the nanoparticle is uniformly spherical and has a dispersion ratio of 0.14. The physicochemical study using DSC indicated significant thermal stability and crystalline nature of the nanoparticle. This intracellular biosynthesis of silver nanoparticles is simple, cheap and eco-friendly than other mechanical and chemical approaches.

scholarly journals XPS, SEM, DSC and Nanoindentation Characterization of Silver Nanoparticle-Coated Biopolymer Pellets

2021 ◽  
Vol 11 (16) ◽  
pp. 7706
Author(s):  
Justina G. Motas ◽  
Nima E. Gorji ◽  
Dumitru Nedelcu ◽  
Dermot Brabazon ◽  
Fabrizio Quadrini
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Physical Vapor Deposition ◽  
Sustainable Manufacturing ◽  
Active Surface ◽  
High Water Content ◽  
Scanning Calorimetry ◽  
Eu Directive ◽  
Nano Coating

The development of environmentally friendly materials has been the focus of many research groups in recent years due to increased harmful effects of plastics on the environment. Bio-based materials are considered a key solution from a sustainable manufacturing perspective. The nano-coating of biopolymer blends with silver nanoparticles is the subject of challenging research projects in line with the EU Directive on environment protection and sustainable manufacturing. Coating biopolymers with silver nanoparticles provides an antimicrobial and antiviral active surface. In this work, we develop silver nanoparticle-coated biopolymer Arboblend V2 Nature pellets. The main goal is to obtain a new material with antibacterial action obtained from the blending of a biopolymer pellets with silver nanoparticles through physical vapor deposition. The study is divided in three steps. The first step represents the silver nano-coating of the Arboblend V2 Nature and the characterization of the coated/raw pellets. The second step involves the injection molding of the silver nano-coated pellets and the characterization of the samples obtained. The last step regards the press molding of the coated pellets in order to obtain thin films, as well as their characterization. The PVD-sputtering technique is used to coat the pellets with silver nanoparticles. This process is especially optimized for coating raw materials with high water content and small-size pellets. The mechanical properties, surface chemical composition and the thermal properties of the both virgin and silver nanoparticle-coated biopolymer pellets are measured and analyzed for mechanical and thermal resistance of the nano-coating layer. Differential scanning calorimetry, scanning electron microscopy, X-ray photoemission spectroscopy and nanoindentation mechanical testing is performed. The calorimetry test detects no significant alteration of the biopolymer produced from the PVD process and confirms the optimized PVD process for nano-coating of the Arboblend V2 Nature pellets with a viable application in nano-silver–biopolymer composite products.

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