Application of Gradient and Confocal Raman Spectroscopy to Analyze Silver Nanoparticle Diffusion in Medieval Glasses

2009 ◽  
Vol 8 ◽  
pp. 89-97 ◽  
Author(s):  
F. Rubio ◽  
Sofia Pérez-Villar ◽  
Miguel Angel Garrido ◽  
Juan Rubio ◽  
J.L. Oteo
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Glass Surface ◽  
Microprobe Analysis ◽  
Glass Structure ◽  
Silver Ions ◽  
Nanoparticle Concentration ◽  
Confocal Raman Spectroscopy ◽  
Nanoparticle Diffusion

In this work it has been carried out the diffusion of silver ions in medieval glasses by a heat treatment process. Silver ions are transformed into both silver nanoparticles and nanoclusters after redox reactions with reducing glass ions. Changes in glass colour due to the formation of these silver nanoparticles have been analysed by means of visible spectroscopy. At the same time, changes in glass structure have been analysed by means of Raman scattering. By using confocal Raman spectroscopy the in deep glass structural changes occurring after silver ion diffusion and silver nanoparticle formation have been studied. These changes have been corroborated by means of gradient Raman spectroscopy where the silver ion and silver nanoparticle diffusion have been analysed on a fractured glass surface. In all cases have been observed that silver nanoparticles produce a depolymerisation of the glass structure and that such depolymerisation increases with the amount of silver nanoparticles. By using Microprobe Analysis it has been found that the higher silver nanoparticle concentration is on the glass surface and it decreases with the distance to the surface according to a diffusion process. By using nanoindentation measurements on original and gradient glass surfaces it has been found an increase of the Young modulus from 60 to 85 GPa, being the first value that corresponding to the glass surface with high silver nanoparticle concentration, and the second one for the glass without silver. This result is in accordance with Raman and Microprobe analysis.

scholarly journals Влияние концентрации наночастиц серебра в функциональных покрытиях TiO-=SUB=-2-=/SUB=--Ag на характеристики фотопреобразователей GaInP/GaAs/Ge

2018 ◽  
Vol 52 (8) ◽  
pp. 860
Author(s):  
Л.С. Лунин ◽  
М.Л. Лунина ◽  
А.А. Кравцов ◽  
И.А. Сысоев ◽  
А.В. Блинов ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Solar Cells ◽  
Silver Nanoparticle ◽  
Optimum Concentration ◽  
Nanoparticle Concentration ◽  
Functional Coatings ◽  
Functional Characteristics

AbstractThe results of studying the effect of the silver nanoparticle concentration in TiO_2–Ag functional coatings on the characteristics of GaInP/GaAs/Ge photoconverters are discussed. The optimum concentration of silver nanoparticles in TiO_2 coatings, improving the functional characteristics of solar cells is determined.

scholarly journals Eco-Friendly Approach to Control Mosquitos (A. stephensi, C. quinquefasciatus, and A. aegypti) Using Silver Nanoparticle

2020 ◽  
Vol 9 (1) ◽  
pp. 203-210
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Ag Nanoparticles ◽  
Leaf Extract ◽  
Anopheles Stephensi ◽  
Methanol Extract ◽  
Silver Ions ◽  
Mosquito Vectors ◽  
Chemical Insecticide ◽  
Ft Ir

The available controlling agents for mosquito vectors are chemical insecticides and the frequent usage of these insecticides creating resistance among mosquito vectors and environmental pollutions. Thus, the study was designed to synthesize and characterize the Ag nanoparticles (AgNPs) through a methanol leaf extract of Ocimum canum and find the larvicidal prospective of the AgNPs on the 4th instar larvae of Anopheles stephensi, Culex quinquefasciatus, and Aedes aegypti. The obtained outcomes show that the methanol leaf extract of O. canum was effectively reduced the silver ions and produce constant silver nanoparticles. It was characterized and confirmed by various scientific techniques such as UV-vis spectrum, XRD, SEM, FT-IR and EDaX. Various concentrations (10, 50, 150, 200, and 250 ppm) of characterized nanoparticles were tested for larvicidal activity. The premier larval death was observed at 24 h of treatment on A. aegypti with LC50= 17.03 ppm, followed by C. quinquefasciatus with LC50= 14.89 ppm of methanol extract of O. canum and no death was noticed on A. stephensi. The LD90 value for A. aegypti and C. quinquefasciatus were 24.18 & 20.65 ppm respectively. Hence, the Ag nanoparticles produced from methanol leaf extract of O. canum retains efficiency to control A. aegypti and C. quinquefasciatus. Thus, it might support partially to replace the chemical insecticide which used against these vectors and might contribute to reduce environmental pollution.

scholarly journals Silver nanoparticles – wolves in sheep's clothing?

2015 ◽  
Vol 4 (3) ◽  
pp. 563-575 ◽  
Author(s):  
Rasmus Foldbjerg ◽  
Xiumei Jiang ◽  
Teodora Miclăuş ◽  
Chunying Chen ◽  
Herman Autrup ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Molecular Mechanisms ◽  
Silver Ions ◽  
Nanoparticle Toxicity ◽  
Intracellular Fate

We review the cellular and molecular mechanisms behind silver nanoparticle toxicity and their intracellular fate. In addition, the role of silver ions in the toxicity of silver nanoparticles is discussed.

scholarly journals Synthesis of Silver Nanoparticles from Malva parviflora Extract and Effect on Ecto-5'- Nucleotidase(5'-NT), ADA and AMPDA Enzymes in Sera of Patients with Arthrosclerosis

2017 ◽  
Vol 14 (4) ◽  
pp. 742-750 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Silver Ions ◽  
Reducing Agent ◽  
Rapid Reduction ◽  
Agno3 Solution ◽  
Malva Parviflora

The present research included synthesis of silver nanoparticle from(1*10-3,1*10-4 and1*10-5) M aqueous AgNO3 solution through the extract of M.parviflora reducing agent. In the process of synthesizing silver nanoparticles we detected a rapid reduction of silver ions leading to the formation of stable crystalline silver nanoparticles in the solution.

scholarly journals Antimicrobial Effect of Electrospun Nanofibers Loaded with Silver Nanoparticles: Influence of Ag Incorporation Method

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Luis Jesús Villarreal-Gómez ◽  
Graciela Lizeth Pérez-González ◽  
Nina Bogdanchikova ◽  
Alexey Pestryakov ◽  
Vadim Nimaev ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Electrospun Nanofibers ◽  
Silver Ions ◽  
Antimicrobial Effect ◽  
The Other ◽  
High Antimicrobial Activity ◽  
Biomedical Industry ◽  
Incorporation Method

The antimicrobial bioactivity of silver nanoparticles is well known, and they can be used widely in many applications, becoming especially important in the biomedical industry. On the other hand, the electrospun nanofibers possess properties that can enhance silver nanoparticle applicability. However, silver nanoparticle bioactivity differs depending on the loading of silver ions into electrospun nanofibers. This review is aimed at comparing different silver incorporation methods into electrospun nanofibers and their antimicrobial activity, discussing each procedure’s limitations, and presenting the most promising one. This review showed that the preferred techniques for incorporating silver nanoparticles were direct blending and ultraviolet irradiation methods due to their simplicity and efficient results. Besides, polyacrylonitrile nanofibers (PAN) have been the most reported system loaded with silver nanoparticles. Finally, independently of the technique used, silver nanoparticle-loaded nanofibers show high antimicrobial activity in all cases.

Pollutant capturing SERS substrate: porous boron nitride microfibers with uniform silver nanoparticle decoration

Nanoscale ◽  
2015 ◽  
Vol 7 (45) ◽  
pp. 18992-18997 ◽  
Author(s):  
Pengcheng Dai ◽  
Yanming Xue ◽  
Xuebin Wang ◽  
Qunhong Weng ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Boron Nitride ◽  
Silver Nanoparticle ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

We designed a novel pollutant capturing surface enhanced Raman spectroscopy (SERS) substrate based on boron nitride microfibers uniformly decorated with silver nanoparticles.

scholarly journals Green synthesis of Silver nanoparticles through Calotropis gigantea leaf extracts and evaluation of antibacterial activity against Vibrio alginolyticus

2012 ◽  
Vol 2 (1) ◽  
pp. 3 ◽  
Author(s):  
Vaseeharan Baskaralingam ◽  
Clara Gunapoorani Sargunar ◽  
Yong Chin Lin ◽  
Jiann Chu Chen
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Experimental Infection ◽  
Morphological Characteristics ◽  
Vibrio Alginolyticus ◽  
Effective Control ◽  
Nanoparticle Concentration ◽  
Leaf Extracts ◽  
Calotropis Gigantea ◽  
Green Synthesized Silver Nanoparticles

Green synthesized silver nanoparticles by <em>Calotropis gigantea</em> leaf extract were used to study the inhibitory activity against pathogenic <em>Vibrio alginolyticus</em>, isolated from wild <em>Artemia franciscana</em> cysts. Silver nanoparticle synthesis was observed using UV-visible spectroscopy and the morphological characteristics were analyzed by atomic force microscope (AFM). In the present study, increasing concentrations of silver nanoparticles synthesized on LB agar plates effectively reduced the number of colonies of <em>V. alginolyticus</em>. A decrease in colonies (CFUs) was observed at 5 mg/mL of silver nanoparticle concentration and the complete inhibition of V. alginolyticus was observed at 20 mg/mL of silver nanoparticle concentration on LB agar plates. In vivo controlling efficiency of silver nanoparticles was tested in an <em>A. franciscana</em> hatching system. Effective control of <em>V. alginolyticus</em> in brine shrimp <em>A. franciscana</em> hatching units was achieved by experimental infection and treatment with silver nanoparticles. Experimental infection studies showed that <em>V. alginolyticus</em> infected <em>Artemia</em> nauplii treated with silver nanoparticles (10 mg/mL) had greater survival (&gt;40%) than silver nanoparticles not treated with nauplii. Based on the findings of this study, it is recommended that low concentrations of green synthesized silver nanoparticles should be further investigated for other potential experimental models to control potential medical pathogens.

scholarly journals Single Pot Synthesis of Gellan Gum Coated Silver Nanoparticles and its Antimicrobial Activity

2021 ◽  
Vol 33 (9) ◽  
pp. 2049-2052
Author(s):  
D. Muralidharan ◽  
A. Jaculin Raiza ◽  
K. Pandian
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Silver Ions ◽  
Reducing Agent ◽  
Gellan Gum ◽  
Pathogenic Microorganisms ◽  
Complete Reduction ◽  
Excellent Activity ◽  
Analytical Tools

A single pot synthesis of gellan gum coated silver nanoparticles using aniline as a reducing agent has been investigated in present study. The reaction was facile at 80 ºC under reflux condition and the complete reduction of silver ions was noted within 2 h. The resulting gellan gum protected silver nanoparticle was isolated and analyzed with various analytical tools. The antimicrobial activity of the prepared nanocomposite had shown an excellent activity against some selected pathogenic microorganisms.

scholarly journals Optimizing electroporation assisted silver nanoparticle delivery into living C666 cells for surface-enhanced Raman spectroscopy

2011 ◽  
Vol 25 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Yun Yu ◽  
Juqiang Lin ◽  
Yanan Wu ◽  
Shangyuan Feng ◽  
Yongzeng Li ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Spectrum ◽  
Electric Pulses ◽  
Nanoparticle Delivery ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Delivery Efficiency

Electroporation assisted metallic nanoparticle delivery has been shown by our previous work to significantly reduce the time of sample preparation for surface-enhanced Raman spectroscopy (SERS) measurements of biological cells. In this paper, we report our experimental work to optimize the electroporation parameters, including adjustment of the pulse pattern, operation temperature, and electroporation buffer, for fastest delivery of silver nanoparticles into living C666 cells (a human nasopharyngeal carcinoma cell line). The delivery efficiency was evaluated by the integrated intensity of whole cell SERS spectrum. Our work concluded that the silver nanoparticle delivery rate is best under the electroporation condition of using 4 consecutive 350 V (875 V/cm) rectangular electric pulses of 1, 10, 10 and 1 ms durations, respectively. Low temperature (0–4°C) is necessary for keeping cell viability during the electroporation process and it also improves the delivery efficiency of silver nanoparticles. The serum in the buffer has no obvious effect on the delivery efficiency.

scholarly journals Concerted dispersion of Staphylococcus aureus biofilm by bacteriophage and ‘green synthesized’ silver nanoparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 1420-1429
Author(s):  
Salim Manoharadas ◽  
Mohammad Altaf ◽  
Abdulwahed Fahad Alrefaei ◽  
Rajesh Mamkulatil Devasia ◽  
Ahmed Yacine M. Badjah Hadj ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Glass Surface ◽  
Green Synthesized Silver Nanoparticles

Formation of biofilm by Staphylococcus aureus ‘Rumba’ on untreated glass surface and a concerted disruption of the biofilm by silver nanoparticle and phage ϕ44AHJD.

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