Silver nanoparticles linked by a Pt-containing organometallic dithiol bridge: study of local structure and interface by XAFS and SR-XPS

2014 ◽  
Vol 16 (23) ◽  
pp. 11719-11728 ◽  
Author(s):  
C. Battocchio ◽  
I. Fratoddi ◽  
L. Fontana ◽  
E. Bodo ◽  
F. Porcaro ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Local Structure ◽  
Chemical Interaction

Silver nanoparticles (AgNPs) functionalized with an organometallic bifunctional thiol, leading to 2D networks, were investigated by SR-XPS and XAFS with the aim to probe the nature of the chemical interaction between the ligand and Ag atoms on the NPs surface.

scholarly journals Acute hepatotoxicity and drug/chemical interaction toxicity of 10-nm silver nanoparticles in mice

2019 ◽  
Vol 6 (2) ◽  
pp. 37-44
Author(s):  
Katsuhiro Isoda ◽  
Naoki Kobayashi ◽  
Yuichiro Taira ◽  
Ikuko Taira ◽  
Yoshimi Shimizu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Interaction

Exelfs As A Tool For Investigating The Local Structure Of Bulk Glass-Forming Metal Alloys

1999 ◽  
Vol 5 (S2) ◽  
pp. 138-139
Author(s):  
F, M. Alamgir ◽  
Y. Ito ◽  
D. B. Williams ◽  
H. Jain
Keyword(s):  
Metallic Glasses ◽  
Local Structure ◽  
Chemical Interaction ◽  
Random Packing ◽  
Metallic Alloys ◽  
Metal Alloys ◽  
Bulk Glass ◽  
Glass Forming ◽  
Structure Of Glasses ◽  
Intellectual Challenge

The discovery of amorphous, or glassy, metallic alloys in 1959 posed an intellectual challenge. How can one describe the structure of glasses when there is no long-range periodicity? What can the structure tell us about why certain metal alloys form glasses more easily than others? First, some universal characteristics, if any exist, of the structure metallic glasses needed to be found. A convincing model was proposed for the structure of metallic glasses based on Bernal’s dense random packing (DRP) structure. Central to this proposal is the idea that the structure of metallic glasses is that of the random filling of space by non-interacting identical spheres. In this model, strongly directional interatomic bonds do not play an important role in determining the structure of metallic glasses. This model is hpwever in conflict with one proposed by Chen, which correlates increased glass formability with increased chemical interaction between dissimilar atoms.

scholarly journals SILVER NANOPARTICLES AND COCONUT OIL INCORPORATED BIOPOLYMER BASED ELECTROSPUN NANOFIBERS FOR WOUND DRESSING

2021 ◽  
pp. 204-209
Author(s):  
SUBHASHREE SAHOO ◽  
JOGABRATA TRIPATHY ◽  
AFRASIM MOIN ◽  
MEENAKSHI S. ◽  
SIDDARAMAIAH ◽  
...  
Keyword(s):  
Wound Healing ◽  
Silver Nanoparticles ◽  
Chemical Interaction ◽  
Coconut Oil ◽  
Electrospun Nanofibers ◽  
Reduced Form ◽  
Ag Nps ◽  
Disk Diffusion Assay ◽  
Zones Of Inhibition ◽  
Oil Concentration

Objective: The main aim of this study was to develop and evaluate the nanofiber loaded with coconut oil and silver nanoparticles (Ag NPs) for the treatment of wound healing by the electrospun method. Methods: The nanofibers have been created using the reduced form of silver nanoparticles and coconut oil along with Eudragit L-100 by the electrospun method. The presence of coconut oil and chemical interaction was determined by the FTIR method. XRD was made to evaluate the crystalline nature of AgNPs and Eudragit L-100. TEM was carried out to show the presence of AgNPs on the surface of nanofibers and SEM represents the diameter of the fiber. The antibacterial activity of nanofibers was carried out using a disk diffusion assay. Results: The diameter of the fibers was diminished by the excess of AgNPs in the fibers, while it increases by the coconut oil concentration, enhancing the nanofiber's hydrophilicity. FTIR spectroscopy was found in the range of coconut oil at 3553 cm-1for O-H stretch, 1365 cm-1, and 1240 cm-1 for the C-O stretch of ester groups. The diffraction peaks at 2θ of 38.5°, 44.6°, and 64.7°, in the XRD spectra of nanofiber, changed with silver NP affirming the total decrease of Ag salt. The bactericidal activity has been carried out between Escherichia coli and Staphylococcus aureus showing zones of inhibition of 20.0±0.2 mm and 14.8±0.4 mm, exhibiting excellent bactericidal characteristics for wound healing. Conclusion: The formulated nanofibers were obtained to offer protection against external agents and help in the regeneration of new tissue.

Understanding chemical interaction between phosphonate-derivative molecules and a silver surface cluster in SERS: a combined experimental and computational approach

2019 ◽  
Vol 21 (40) ◽  
pp. 22180-22187 ◽  
Author(s):  
Gauthier Emonds-Alt ◽  
Benoit Mignolet ◽  
Cedric Malherbe ◽  
Jean-Christophe M. Monbaliu ◽  
Francoise Remacle ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Interaction ◽  
Computational Approach ◽  
Silver Surface ◽  
Surface Cluster ◽  
Adsorption Mode

This joint experimental-theoretical SERS study provides new insights on the adsorption mode of phosphonate-derivative molecules on silver nanoparticles.

scholarly journals Formation of silver nanoparticles on lignin and two of its precursors

Les/Wood ◽  
2021 ◽  
Vol 70 (1) ◽  
Author(s):  
Sebastian Dahle ◽  
Lienhard Wegewitz ◽  
Wolfgang Viöl ◽  
Wolfgang Maus-Friedrichs
Keyword(s):  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Organic Molecules ◽  
Chemical Interaction ◽  
Catalytic Decomposition ◽  
Organic Substrate ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Adsorbed Silver

Metastable Induced Electron Spectroscopy, Ultraviolet Photoelectron Spectroscopy (He I and He II), X-ray Photoelectron Spectroscopy, and Atomic Force Microscopy were employed to study the interaction of silver with lignin as well as with two of its natural precursors, coniferyl alcohol and sinapyl alcohol. For all three of them, no chemical interaction between the adsorbed silver and the organic substrate was found before contact with air. Nevertheless, silver nanoparticles were found in all three cases after contact with air. Thus, a process of silver nanoparticle formation during the decomposition of the organic molecules is suggested, similar to the previously found catalytic decomposition of cinnamyl alcohol by water in the presence of silver atoms.

X-ray microprobe for materials science

1994 ◽  
Vol 52 ◽  
pp. 56-57
Author(s):  
G.E. Ice
Keyword(s):  
Crystallographic Orientation ◽  
Local Structure ◽  
Materials Science ◽  
Chemical Information ◽  
X Ray Diffraction ◽  
Ray Optics ◽  
X Ray ◽  
Novel Materials ◽  
New Information ◽  
Elemental Sensitivity

The increasing availability of synchrotron x-ray sources has stimulated the development of advanced hard x-ray (E≥5 keV) microprobes. With new x-ray optics these microprobes can achieve micron and submicron spatial resolutions. The inherent elemental and crystallographic sensitivity of an x-ray microprobe and its inherently nondestructive and penetrating nature will have important applications to materials science. For example, x-ray fluorescent microanalysis of materials can reveal elemental distributions with greater sensitivity than alternative nondestructive probes. In materials, segregation and nonuniform distributions are the rule rather than the exception. Common interfaces to whichsegregation occurs are surfaces, grain and precipitate boundaries, dislocations, and surfaces formed by defects such as vacancy and interstitial configurations. In addition to chemical information, an x-ray diffraction microprobe can reveal the local structure of a material by detecting its phase, crystallographic orientation and strain.Demonstration experiments have already exploited the penetrating nature of an x-ray microprobe and its inherent elemental sensitivity to provide new information about elemental distributions in novel materials.

DETERMINATION OF THE LOCAL STRUCTURE OF METALLIC GLASSES BY EXAFS

1982 ◽  
Vol 43 (C9) ◽  
pp. C9-43-C9-46 ◽  
Author(s):  
A. Sadoc ◽  
A. M. Flank ◽  
D. Raoux ◽  
P. Lagarde
Keyword(s):  
Metallic Glasses ◽  
Local Structure

LOCAL STRUCTURE IN InGaAsP QUATERNARY ALLOYS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-423-C8-426
Author(s):  
H. OYANAGI ◽  
Y. TAKEDA ◽  
T. MATSUSHITA ◽  
T. ISHIGURO ◽  
A. SASAKI
Keyword(s):  
Local Structure ◽  
Quaternary Alloys

LOCAL STRUCTURE AND THERMODYNAMICS OF II-VI AND III-V SEMICONDUCTORS BY EXAFS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-403-C8-406
Author(s):  
N. MOTTA ◽  
A. BALZAROTTI ◽  
P. LETARDI
Keyword(s):  
Local Structure
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