scholarly journals Influence of Surfactants and Dissolved Gases on the Silver Nanoparticle Plasmon Resonance Absorption Spectra Formed by the Laser Ablation Processes

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Ming Jing Chua ◽  
Yoshinori Murakami
Keyword(s):  
Silver Nanoparticles ◽  
Laser Irradiation ◽  
Surface Plasmon ◽  
Silver Nanoparticle ◽  
Nanoparticle Synthesis ◽  
Dissolved Gas ◽  
Nanoparticle Growth ◽  
Spectral Shifts ◽  
Plausible Mechanism ◽  
Anionic And Cationic Surfactants

The silver nanoparticles were fabricated by the focused laser irradiation to silver rod immersed in various kinds of surfactant aqueous solutions. It was found that anionic and cationic surfactants showed different roles on the silver nanoparticle growth during the focused laser irradiation processes. Silver nanoparticle synthesis in an amphoteric surfactant aqueous solution was also carried out using the same techniques, and it was found that the spectral shifts for these surface plasmon bands showed complicated behaviors against the concentration of amphoteric surfactants as well as pH. Furthermore, the influence of the gas dissolved in a solution on the silver nanoparticle growth during the focused laser irradiation processes was investigated. With increasing the gas pressure of CO2, the surface plasmon bands of silver nanoparticles were shifted to longer wavelength, suggesting that the dissolved gas of CO2 in a solution enhances the silver nanoparticle growth. The plausible mechanism was proposed to understand the reason of such enhancement of silver nanoparticle growth by increasing the dissolved gas in a solution.

Synthesis and Characterization of Silver Nanoparticles from Psidium Guajava Leaf Extract

2021 ◽  
Vol 14 (5) ◽  
pp. 5634-5638
Author(s):  
Sruthi Radhakrishnan
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Leaf Extract ◽  
Nanoparticle Synthesis ◽  
Ethanolic Extract ◽  
Psidium Guajava ◽  
Sem Analysis ◽  
Synthesis Of Nanoparticles ◽  
Elemental Silver ◽  
Ft Ir

Green route for the synthesis of nanoparticles has become more acceptable than the other chemical as well as biological route. In the present study, silver nanoparticle is synthesized using ethanolic extract of Psidium guajava leaves. Further the synthesized silver nanoparticles were characterized by UV-Visible Spec, FT-IR, X-Ray Diffraction FESEM and E-DAX. The results of FT-IR provided evidence of the involvement of phytochemicals present in the leaf extract in the reduction of silver nitrate to silver nanoparticles. XRD confirmed the crystalline structure as well as shape of the synthesized nanoparticle as face-centred cubic. E-DAX profiling helped in determining the presence of elemental silver. The size of the nanoparticle procured by SEM analysis was found to be approximately 30-50 nm in size. Thus, the findings of this study showed that the plant assisted method for silver nanoparticle synthesis is more effective and further application level studies can shed lights on their use in healing of various human ailments.   

scholarly journals Instrumental Characterization and Antibacterial Investigation of Silver Nanoparticles Synthesized From Garcinia Kola Leaf

2019 ◽  
Vol 9 (6-s) ◽  
pp. 58-64 ◽  
Author(s):  
Sunday Adewale AKINTELU ◽  
Aderonke Similoluwa FOLORUNSO ◽  
Olabisi Theresa ADEMOSUN
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Surface Plasmon ◽  
Silver Nanoparticle ◽  
Nitrate Solution ◽  
Diffusion Method ◽  
Average Particle ◽  
Silver Surface ◽  
Garcinia Kola ◽  
X Ray

The need to devise another method of synthesizing nanoparticles from sources that are eco-friendly, non-hazardous and cost effectiveness is of great importance in preventing environmental and health problems. The aim of this study was to evaluate the efficiency of Garcinia kola leaves as reducing and stabilizing agent for silver nanoparticles synthesis. The leaves of Garcinia kola obtained were authenticated, air dried, pulverized and extracted. The extract was mixed with aqueous solution of silver nitrate solution to form silver nanoparticles and were characterized using Ultra violet (UV) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The antibacterial investigation of the synthesized silver nanoparticle was carried out following the disk diffusion method. UV analysis revealed the silver surface plasmon band at 425.18 nm, The FTIR indicated -OH, -C=C- and alkane as the functional groups responsible for the stabilization of the silver nanoparticle formed. The morphological assessment from SEM and TEM analysis confirmed that the silver nanoparticle formed are spherical in shape with an average particle size of 28.80nm.The EDX analysis ascertained that the silver surface plasmon resonance at 2.8–3.2 keV was confirmed the reduction of silver ion (Ag+ to Ag0). The XRD study revealed the crystalline nature of the nanoparticles synthesized. The antibacterial investigation showed high inhibition against the growth of tested bacteria.  This study ascertained that the green synthesis of silver nanoparticle without the use of harmful solvent that are offensive to the environment is achievable.  Keywords: Silver nanoparticles, Biosynthesis, Characterization, Antibacterial activity and Garcinia kola.

scholarly journals Application of ferrocene-resorcinarene in silver nanoparticle synthesis

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87128-87133 ◽  
Author(s):  
Tatiana Yu. Sergeeva ◽  
Aida I. Samigullina ◽  
Aidar T. Gubaidullin ◽  
Irek R. Nizameev ◽  
Marsil K. Kadirov ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Nanoparticle Synthesis ◽  
Colloidal Silver ◽  
Colloidal Silver Nanoparticles ◽  
Silver Nanoparticle Synthesis

An amphiphilic resorcinarene with ferrocene groups at the lower rim has been applied as both reductant and stabilizer in the synthesis of colloidal silver nanoparticles.

scholarly journals Enhanced Silver Nanoparticle Synthesis by Escherichia Coli Transformed with Candida Albicans Metallothionein Gene

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4180 ◽  
Author(s):  
Qunying Yuan ◽  
Manjula Bomma ◽  
Zhigang Xiao
Keyword(s):  
Escherichia Coli ◽  
Silver Nanoparticles ◽  
Candida Albicans ◽  
Silver Nanoparticle ◽  
Large Scale ◽  
Nanoparticle Synthesis ◽  
Scale Production ◽  
E Coli ◽  
Metallothionein Gene ◽  
Silver Nanoparticle Synthesis

In this study, the metallothionein gene of Candida albicans (C. albicans) was assembled by polymerase chain reaction (PCR), inserted into pUC19 vector, and further transformed into Escherichia coli (E. coli) DH5α cells. The capacity of these recombinant E. coli DH5α cells to synthesize silver nanoparticles was examined. Our results demonstrated that the expression of C. albicans metallothionein in E. coli promoted the bacterial tolerance to metal ions and increased yield of silver nanoparticle synthesis. The compositional and morphological analysis of the silver nanoparticles revealed that silver nanoparticles synthesized by the engineered E. coli cells are around 20 nm in size, and spherical in shape. Importantly, the silver nanoparticles produced by the engineered cells were more homogeneous in shape and size than those produced by bacteria lack of the C. albicans metallothionein. Our study provided preliminary information for further development of the engineered E. coli as a platform for large-scale production of uniform nanoparticles for various applications in nanotechnology.

scholarly journals Colorimetric Detection Based on Localized Surface Plasmon Resonance Optical Characteristics for Sensing of Mercury Using Green-Synthesized Silver Nanoparticles

2020 ◽  
Vol 2020 ◽  
pp. 1-14 ◽  
Author(s):  
Eman Alzahrani
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon ◽  
Silver Nanoparticle ◽  
Colorimetric Detection ◽  
Ultrasound Irradiation ◽  
Localized Surface Plasmon ◽  
Face Centered Cubic ◽  
Sem Images ◽  
Face Centered ◽  
Green Synthesized Silver Nanoparticles

Development of selective colorimetric detectors that can use green-fabricated silver nanoparticles’ (AgNPs) with localized surface plasmon resonances (LSPRs) to rapidly, simply, and selectively detect HgII ions was undertaken in this study. Onion extract was used for synthesising photo-induced green crystalline silver nanoparticles (NPs). The formation of nanoparticles is enhanced when ultrasound irradiation is present; bioligands could serve as stabilizing and reducing agents. Different methods of measurement, including UV-Vis, TEM,SEM/EDAX,FT−IR, and XRD, are effective for characterization of nanoparticles. The spherical nature of green-fabricated AgNPs is confirmed by TEM. High-density, spherical, and uniformly formed silver nanoparticle shapes were found in silver nanoparticle SEM images. The arrangement of AgNPs in the form of face-centered cubic structures was confirmed by XRD patterns. The formation of impurity-free AgNPs was confirmed using the EDAX analysis results. Hg2+ with excellent sensitivity was sensitively and selectively detected by employing green-synthesized silver nanoparticles. The reduction of Ag (1) to Ag (0) was confirmed by a slight increase in Hg (II) concentration and progressive reduction of green-synthesized AgNPs, whose absorbance changed abruptly. The reduction of LSPRs by the phosphate buffer medium enables AgNPs to sensitively and selectively detect Hg2+ ions by providing good environment. Besides, a selective, sensitive, simple, and rapid method that is proposed for detecting Hg (II) ions in samples of water is presented in the study. Harmful mercury ions in real samples of water (tap and ground water) can colorimetrically and selectively be detected using the AgNPs. The results showed an RSD of below 6% and over 92% of good recovery.

scholarly journals Antibacterial Activity of Silver Nanoparticles Synthesized Using Syzygium aromaticum, Cinnamonum tamala, Cinnamonum cassia Plant Extract

2021 ◽  
pp. 20-31
Author(s):  
Ramesh Kumar Kushwaha ◽  
Holavanahalli Nagaraju Deepa ◽  
Pooja Karkera ◽  
Sadasivam Jayashree
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Plant Extract ◽  
Silver Nanoparticle ◽  
Medical Science ◽  
Nanoparticle Synthesis ◽  
Bacterial Pathogen ◽  
Inhibition Zone ◽  
Diffusion Method ◽  
Syzygium Aromaticum

Syzygium aromaticum (Clove), Cinnamonum tamala (Bay leaf), Cinnamonum cassia (Cinnamon bark) are well known plants in India. All three plants are a rich source of secondary metabolites that find use as antimicrobial agent, in pharmaceutical industry, cosmetics, food and agriculture industry. In regards of antimicrobial activity, green silver nanoparticles were synthesised by using these plants aqueous extract (25%w/v). For silver nanoparticle synthesis different concentration of plant extract were mixed with AgNO3 solution and exposed to sunlight and estimated by the UV-Visible spectrophotometer. Powdered silver nanoparticles (AgNPs) were dissolved in autoclaved distilled water at different concentration (20mg/ml, 10mg/ml, 5mg/ml, and 2.5mg/ml) and performed antimicrobial activity through agar well diffusion method. Silver nanoparticles of all three plants were showed antimicrobial activity against human bacterial pathogen Escherichia coli and Bacillus subtilis. The inhibition zone increased with increasing concentration of all three plants (S. aromaticum, C. tamala and C. cassia) AgNPs, so maximum inhibition zone was observed at 20mg/ml for both pathogens. At higher concentration, the inhibition zone of E. coli were 2.25 ±0.05, 1.7 ±0.1 and 1.85 ±0.05 cm in presence of S. aromaticum, C. tamala and C. cassia AgNPs respectively. Although, The presence of phytochemical terpenoids, tannin and glycosides are was confirmed by the chemical reagent test. In modern era, the nanoparticle based medicine is explored in pharmaceutical and medical science. Therefore this green synthesis of silver nanoparticle can be explored in pharmaceutical science.

scholarly journals Lead–germanate glasses: an easy growth process for silver nanoparticles and their promising applications in photonics and catalysis

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41479-41485 ◽  
Author(s):  
Ricardo Schneider ◽  
Rodrigo Schneider ◽  
Elvio A. de Campos ◽  
Joaquim Bonfim Santos Mendes ◽  
Jorlandio Francisco Felix ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Thermal Annealing ◽  
Silver Nanoparticle ◽  
Growth Process ◽  
Oxide Glasses ◽  
Lead Germanate ◽  
Nanoparticle Growth ◽  
Germanate Glasses

We report non-conventional silver nanoparticle growth on the surface of lead–germanate oxide glasses by thermal annealing under a N2 atmosphere.

scholarly journals Sintesis dan Karakterisasi Nanopartikel Perak-Tricalcium Phosphate (TCP) dengan Bantuan Ekstrak Daun Alpukat (Percea americana)

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Yessi Rahmayani ◽  
Zulhadjri Zulhadjri ◽  
Syukri Arief
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Silver Nanoparticle ◽  
Tricalcium Phosphate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Sintesis nanopartikel perak-TCP telah dilakukan pada penelitian ini. Nanopartikel perak dibuat dengan mereduksi larutan perak nitrat dengan menggunakan ekstrak daun alpukat sebagai bioreduktor. Tricalsium Phosphate (TCP) dicelupkan kedalam nanopartikel perak membentuk komposit perak-tricalcium phosphate. Hasil analisis UV-Vis menunjukkan pembentukan puncak serapan nanopartikel perak pada panjang 445-446 nm, yakni puncak yang khas dari nanopartikel perak yang disebabkan oleh adanya fenomena Surface Plasmon Resonance (SPR). Penelitian ini menghasilkan perak-TCP dengan ukuran nanopartikel. Sesuai  hasil X-Ray Diffraction (XRD) yang menunjukkan bahwa ukuran kristal TCP adalah 64 nm dan ukuran Kristal perak dalam komposit adalah 46 nm. Hasil Scanning Electron Microscopy (SEM) menunjukan partikel perak terdistribusi dipermukaan partikel TCP. Kata Kunci: Komposit perak-TCP, nanopartikel perak, Percea americana,  tricalcium phosphate.  The silver-TCP nanoparticle synthesis was carried out in this study. Silver nanoparticles are made by reducing silver nitrate solution using avocado leaf extract as a bioreactor. Tricalcium Phosphate (TCP) is dipped into silver nanoparticles to form a silver-tricalcium phosphate composite. The UV-Vis analysis shows the formation of silver nanoparticle absorption peaks at a length of 445-446 nm, which is a typical peak of silver nanoparticles caused by the Surface Plasmon Resonance (SPR) phenomenon. X-Ray Diffraction (XRD) shows that the TCP crystal size is 64 nm and the size of the Silver Crystal in the composite is 46 nm. The results of Scanning Electron Microscopy (SEM) show silver particles distributed on the surface of TCP particles Keywords: Percea americana, silver-TCP composite, silver nanoparticle, tricalcium phosphate.

Phytofunctionalized silver nanoparticles: green biomaterial for biomedical and environmental applications

2018 ◽  
Vol 38 (3) ◽  
pp. 127-149 ◽  
Author(s):  
Shaan Bibi Jaffri ◽  
Khuram Shahzad Ahmad
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Environmental Remediation ◽  
Nanoparticle Synthesis ◽  
Environmental Applications ◽  
One Pot ◽  
Human Welfare ◽  
Potential Applications ◽  
Culture Maintenance ◽  
Silver Nanoparticle Synthesis

AbstractVariegated physicochemical routes with emerging modifications have been adopted and reported for silver nanoparticle synthesis for centuries. Nano-biotechnology aimed at the synthesis of nanomaterials, including silver nanoparticles, through utilization of biological media has acquired an auspicious role in science for human welfare. Despite recurrent nanoscale researches on physicochemical routes, coeval stages are predominated by greener methods in silver nanoparticle synthesis for the utilization of its inherent toxicity and exceedingly smaller sizes for biological and environmental applications. One of the principles of green routes for silver nanoparticle synthesis is reduction and stabilization via phytochemicals extracted from plants in a one-pot protocol of phytofunctionalization. Plants are preferred for their abundant availability, environmental non-toxicity and economical favorability and chiefly for the ease of aptness, unlike microbial pathways having tedious requirements of cellular culture maintenance conditions. The present work reviewed the most recent milestones set in the selection of types and parts of plants and optimized synthetic conditions employed in the fabrication of silver nanoparticles, in addition to quantitative and qualitative characterization. Furthermore, the use of phytofunctionalized silver nanoparticles for microbial growth inhibition and environmental remediation was also studied. Through the meticulous review of literature, potential applications were highlighted, which can provide researchers with a plethora of avenues for future investigations for remediation of the environment, in terms of both combating pathogenic microbes and environmental detoxification.

Detection of intracellular silver nanoparticles using flow cytometry

2018 ◽  
pp. 223-226
Author(s):  
С.И. Каба ◽  
А.А. Соколовская
Keyword(s):  
Flow Cytometry ◽  
Silver Nanoparticles ◽  
Endothelial Cells ◽  
Silver Nanoparticle ◽  
Cell Uptake ◽  
Control Samples

Продемонстрировано обнаружение наночастиц серебра во внутриклеточном пространстве с помощью проточной цитофлуориметрии. В эндотелиальных клетках линии EA.hy926, инкубированных в растворе, содержащем 2 мкг/мл наносеребра, измеряли боковое светорассеяние. По сравнению с контрольными образцами этот параметр возрастал, в то время как прочие значимые характеристики не изменялись. Это подтверждает чувствительность метода к изменившемуся состоянию клеток и указывает на поглощение наночастиц серебра клетками при концентрации ниже токсической. The study demonstrated a possibility for detection of intracellular silver nanoparticles using flow cytometry. The parameter used in this work, side scattering, was measured in EA.hy926 endothelial cells incubated in a 2 mg/ml silver nanoparticle solution. This parameter was increased compared to control samples. Therefore, this technique was sensitive to changes in the cell status and suggested the cell uptake of the particles under the subtoxic conditions.

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