Controllable Synthesis of Silver Nanoparticles Using Piezoelectric-Actuated High-Frequency Vibration Self-Circulating Microfluidic Reactor

NANO ◽  
2019 ◽  
Vol 14 (08) ◽  
pp. 1950097 ◽  
Author(s):  
Guojun Liu ◽  
Fang He ◽  
Yan Li ◽  
Xinbo Li ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
High Frequency ◽  
Synthesis Method ◽  
Driving Voltage ◽  
Controllable Synthesis ◽  
Synthesis Mechanism ◽  
Growth Environment ◽  
High Frequency Vibration ◽  
Microfluidic Reactor ◽  
Transmission Electron

Based on the liquid-phase reduction mechanism, a controllable synthesis method, which uses piezoelectric-actuated high-frequency vibration self-circulating microfluidic reactor, to prepare silver nanoparticles is proposed. Firstly, the synthesis mechanism of silver nanoparticles and the working principle of the microfluidic reactor were analyzed. Then, in order to study and explore the influence of self-circulating and high frequency vibration on the synthesis of silver nanoparticles, a series of related synthesis experiments were carried out. The synthesized silver nanoparticles were characterized by UV-Visible spectroscopy and transmission electron microscopy. The effects of micropump driving voltage and high-frequency vibration on the synthesis of silver nanoparticles were analyzed. The experiment results show that when the silver nanoparticles were synthesized using piezoelectric-actuated high-frequency vibration self-circulating microfluidic reactor, the higher the driving voltage of the circulating reflux micropump, the faster the vortex rotation speed in the mixing pool and the more uniform the reagent reaction. Besides, high-frequency vibration can suppress the aggregation of silver nanoparticles, and balance the growth environment of particles, which is beneficial to the formation of silver nanoparticles with good monodispersity, high sphericity and small size deviation.

Optimization of Green Synthesis Approach of Silver Nanoparticles Using Indonesian Wild Honey

2021 ◽  
Vol 891 ◽  
pp. 111-115
Author(s):  
Maradhana Agung Marsudi ◽  
Farah Fitria Sari ◽  
Pandu Mauliddin Wicaksono ◽  
Adinda Asmoro ◽  
Arif Basuki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particle Count ◽  
Transmission Electron ◽  
Nitrate Precursor ◽  
Synthesis Approach

In this work, silver nanoparticles have been successfully synthesized using simple and environmentally friendly ‘green synthesis’ method using Indonesian wild honey as mediator. Particle count and size can be optimized by varying the silver nitrate precursor and honey concentration, with the help of sodium hydroxide as pH regulator. Based on X-ray diffraction (XRD) result, crystalline structure of Ag has been confirmed in sample with impurities from AgCl. Based on dynamic light scattering (DLS) and transmission electron microscopy (TEM) results, it was found that the smallest average particles size of AgNPs (117.5 nm from DLS and 11.1 nm from TEM) was obtained at sample with 5% w/v of honey and 0.5 mM of AgNO3.

Durian Peeling Extract Mediated Green Synthesis of Silver Nanoparticles

2014 ◽  
Vol 875-877 ◽  
pp. 18-22 ◽  
Author(s):  
Fueangfahkan Chutrakulwong ◽  
Kheamrutai Thamaphat
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Spherical Particles ◽  
Main Role ◽  
X Ray Diffraction ◽  
Synthesis Mechanism ◽  
Durio Zibethinus ◽  
Transmission Electron ◽  
Fcc Phase ◽  
Durian Rind

In this work, silver nanoparticles (AgNPs) were successfully synthesized from AgNO3 through a simple and eco-friendly method, also called the green synthesis, using Mon Thong durian (Durio zibethinus L.) peeling extract. The main role in synthesis mechanism of AgNPs is using polysaccharides in durian rind as a reducing agent as well as stabilizer. The appearance of a yellowish-brown color in mixture of AgNO3 solution and durian rind extract is the indication of formation of AgNPs. The synthesized AgNPs were characterized by UV-visible spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) spectrometry. The AgNPs were found to be polycrystalline in nature and spherical particles with diameter of 11.7 ± 3.2 nm. The crystallinity with fcc phase is evidenced by clear lattice fringes in SAED pattern and diffraction peaks in the XRD pattern corresponding to the (111), (200), (220), and (311) planes.

A NOVEL SYNTHESIS METHOD FOR SILVER NANOPARTICLES USING MOLTEN ε-CAPROLACTAM AS SOLVENT AND REDUCING AGENT

NANO ◽  
2014 ◽  
Vol 09 (08) ◽  
pp. 1450085
Author(s):  
PENG LI ◽  
HOUSHENG XIA ◽  
GUISHENG YANG
Keyword(s):  
Silver Nanoparticles ◽  
Synthesis Method ◽  
Reducing Agent ◽  
Synthesis Process ◽  
Precipitation Reaction ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Transmission Electron ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A precipitation–reduction synthesis method for silver nanoparticles ( Ag NPs) was developed. Molten ε-caprolactam (CL) was used not only as solvent but also as reducing agent and stabilizer. At first, Ag 2 O NPs was prepared by precipitation reaction of silver nitrate ( AgNO 3) and sodium hydroxide ( NaOH ) using molten CL as solvent at 100°C. Then, Ag 2 O NPs was in situ reduced into Ag NPs by molten CL at 120°C. Techniques of X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to monitor the synthesis process. With the increase of reduction time, monodispersed Ag 2 O NPs (ca. 3.7 nm) were integrated and larger Ag NPs (10–90 nm) were formed. Fourier transform infrared (FT-IR) results showed that the surface of Ag NPs was capped with about 0.9 wt.% of CL molecules. Surface enhanced Raman scattering (SERS) effect of Ag NPs was investigated using Rhodamine 6G as a probe molecule.

scholarly journals Dispersibility and Size Control of Silver Nanoparticles with Anti-Algal Potential Based on Coupling Effects of Polyvinylpyrrolidone and Sodium Tripolyphosphate

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1042 ◽  
Author(s):  
Mingshuai Wang ◽  
Haibo Li ◽  
Yinghua Li ◽  
Fan Mo ◽  
Zhe Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Size Distribution ◽  
Sodium Tripolyphosphate ◽  
Scenedesmus Obliquus ◽  
Synthesis Method ◽  
Coupling Effects ◽  
Synthesis Mechanism ◽  
Protective Agents ◽  
X Ray

In nearly all the cases of biotoxicity studies of silver nanoparticles (AgNPs), AgNPs used often have general dispersibility and wide size distribution, which may inevitably generate imprecise results. Herein, a kind of synthesis method by coupling effects of polyvinylpyrrolidone (PVP) and sodium tripolyphosphate (STPP) was proposed, in order to prepare AgNPs with better dispersibility and a stable size. Based on this, the preparation mechanism of AgNPs and the potential anti-algae toxicity were analyzed. UV-vis analysis showed that the particle size distribution of AgNPs prepared by co-protective agents was more uniform. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX) were used to confirm that the obtained nano silver was of a high purity and stable size (~30 nm in diameter). Zeta potential and Fourier transform infrared spectroscopy (FTIR) analysis results indicated the synthesis mechanism of AgNPs by co-protective agents, more precisely, PVP limited the polynegative effect and prevented the linear induction of P3O105− produced by STPP during the growth of silver nuclei. Subsequently, Chlorella and Scenedesmus obliquus were utilized to test the toxicity of AgNPs, confirming that AgNPs synthesized through co-protective agents have potential inhibitory ability on algae, but not severe. This study provides a basic theory for the induction of synthetic AgNPs by various factors in the natural environment and a scientific reference for the environmental risk assessment.

Green synthetic approach for starch capped silver nanoparticles and their antibacterial activity

2016 ◽  
Vol 88 (1-2) ◽  
pp. 61-69 ◽  
Author(s):  
Precious Nokwethemba Sibiya ◽  
Thokozani Xaba ◽  
Makwena Justice Moloto
Keyword(s):  
Silver Nanoparticles ◽  
Synthesis Method ◽  
Spherical Shape ◽  
Cubic Phase ◽  
Hydroxyl Groups ◽  
Synthetic Approach ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Transmission Electron ◽  
Average Size

AbstractIn this work silver nanoparticles (AgNPs) have been prepared from silver nitrate (AgNO3) precursor using a green synthesis method at room temperature. Starch with its abundance of hydroxyl groups and its biocompatibility was used as a capping and reducing agent. The formation of AgNPs was confirmed by absorption spectroscopy with the surface plasmon resonance peak at 400 nm. The sharp reflection at (111), (200), (220) and (311) was observed by powder X-ray diffraction (XRD), which indicated the presence of cubic phase AgNPs. Transmission electron microscopy (TEM) revealed that the average size of AgNPs were between 0.5 and 4 nm with a spherical shape under optimum conditions. The nanoparticles showed a decrease in size with an increase in precursor concentration as well as the increase in capping agent concentration. The nanoparticles also showed to be bactericidal towards the tested Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria.

Reduction of 2,4-Dinitrophenol to 2,4-Diaminophenol Using AuNPs and AgNPs as Catalyst

2018 ◽  
Vol 271 ◽  
pp. 76-84 ◽  
Author(s):  
Khongorzul Gerelbaatar ◽  
Ariunzaya Tsogoo ◽  
Rentsenmyadag Dashzeveg ◽  
Ninjbadgar Tsedev ◽  
Erdene Ochir Ganbold
Keyword(s):  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Synthesis Method ◽  
Correlation Spectroscopy ◽  
Gold And Silver Nanoparticles ◽  
Wet Chemical Synthesis ◽  
Transmission Electron ◽  
Wet Chemical ◽  
Citrate Reduction ◽  
Colloidal Metal

In this study, colloidal metal nanoparticles have been prepared by the wet-chemical synthesis method. Gold and silver nanoparticles with approximate sphere shape were synthesized through the citrate-reduction method. The colloidal metal nanoparticles were characterized by using UV-vis absorption spectroscopy, photon cross-correlation spectroscopy (PCCS) and transmission electron microscope (TEM). Catalytic activities of the metal nanoparticles were investigated through reduction of 2,4-dinitrophenol to 2,4-diaminophenol in the presence of NaBH4 at room temperature. Both gold and silver nanoparticles showed an excellent catalytic activity.

Synthesis and Characterization of Silver Nanoparticles Coated Titanium Dioxide Nanowires

2010 ◽  
Vol 663-665 ◽  
pp. 1175-1178
Author(s):  
Kai Zhang ◽  
Li Yu ◽  
Zhi Xin Lu ◽  
Gang Song
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
Tio2 Nanowires ◽  
X Ray ◽  
Replacement Method ◽  
Transmission Electron ◽  
And Control

For the sake of investigating the special optical character of heteronanostructures, we grow TiO2 nanowires following a three step synthesis method and coat silver nanoparticles on these nanowires with replacement method. Firstly, by adjusting the experiment parameters, we get the single crystalline titanium dioxide nanowires and control their length and diameter successfully. Secondly, we use the replacement method to make the silver nanoparticles coated on these nanowires. Finally, we use transmission electron microscopy and X-ray diffraction to characterize these productions and the results show that the silver nanoparticles are coated on the titanium dioxide nanowires uniformly and the components of these nanowires are only sliver and titanium dioxide. These new optical heteronanostructures are widely investigated all over the world and we sure that they can make great influences to the development of nanophotonics.

Biosynthesis Silver Nanoparticles Using Bacillus Amyloliquefaciens Zxw01 and Research on Synthesis Mechanism

2016 ◽  
Vol 852 ◽  
pp. 437-442
Author(s):  
Jie Zhang ◽  
Ying Zhang ◽  
Bin Song Wang ◽  
Maria Shishova
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Bacillus Amyloliquefaciens ◽  
X Ray Diffraction ◽  
Synthesis Mechanism ◽  
X Ray ◽  
Transmission Electron ◽  
Sds Page ◽  
Before And After ◽  
New Protein

This research reported on synthesis of silver nanoparticles using Bacillus amyloliquefaciens zxw01 culture mixed with silver nitrate. The nanoparticles were characterized by UV-vis spectrum, X-ray diffraction (XRD), Transmission electron microscopy (TEM) and high-resolution transmission electron microscope (HRTEM).In addition, we discussed synthesis mechanism by comparing the protein files of the bacteria before and after mixed with silver nitrate and proteins attached to silver nanoparticles. Our results indicated that silver nanoparticles biosynthesized by Bacillus amyloliquefaciens zxw01 were equally distributed with size between 5 nm to 30 nm and face-centred cubic structure; results of SDS-PAGE suggested that after mixed with silver nitrate, the bacteria differentially expressed and produced a new protein with weight of 33 kDa. Furthermore, analysis of proteins attached to silver nanoparticles indicated that protein with weight of 33 kDa was related to the synthesis of silver nanoparticles.

The Influence of Ph on Green Synthesis of Honey-Mediated Silver Nanoparticles

2021 ◽  
Vol 891 ◽  
pp. 83-88
Author(s):  
Gusti Umindya Nur Tajalla ◽  
Mukhammad Arif Fakhruddin ◽  
Adinda Asmoro ◽  
Arif Basuki ◽  
Arie Wibowo
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Synthesis Method ◽  
Visual Observation ◽  
Hydrodynamic Diameter ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Ph Range ◽  
Influence Of Ph

Silver nanoparticles (AgNPs) have become interesting metal nanoparticles for filler composite electroactive bone scaffold due to its favorable electrical conductivity, chemical stability, and antibacterial activity. The green synthesis method was selected to produce AgNPs because of using safer solvents, minimizing dangerous reagents, and providing benign response conditions suitable for medical applications. In this study, AgNPs were prepared by a green synthesis approach using Indonesian wild honey with a wider pH range (5, 8, 11). Based on visual observation, UV-Vis spectroscopy, dynamic light scattering (DLS), and transmission electron microscopy (TEM) data, increasing pH leads to faster formation of AgNPs and smaller particle size of AgNPs. It was found that the smallest particle size of AgNPs (hydrodynamic diameter is 46.5 nm from DLS result and the actual particle size is 6.3 ± 1.5 nm from TEM result) was generated at pH 11.

Controllable Synthesis of Silver Nanoparticles Using a Double-Layer Y-Shaped SAR Micromixer

NANO ◽  
2020 ◽  
Vol 15 (05) ◽  
pp. 2050068
Author(s):  
Guojun Liu ◽  
Zhiqiang Li ◽  
Xinbo Li ◽  
Yanru Luo ◽  
Xinfeng Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Size Distribution ◽  
Double Layer ◽  
Flow Rate ◽  
Synthesis Method ◽  
Mixing Efficiency ◽  
Controllable Synthesis ◽  
Inlet Flow ◽  
Mixing Performance ◽  
Inlet Flow Rate

Based on the advantages of microfluidics in the field of nanoparticle synthesis, a controllable synthesis method for silver nanoparticles using a double-layer Y-shaped splitting and recombination (SAR) micromixer is proposed. First, the liquid phase synthesis mechanism of silver nanoparticles, the working principle of the double-layer Y-shaped SAR micromixer, and the mixing performance of micromixer at different Reynolds number (Re) are analyzed. Then, the micromixer is used to synthesize silver nanoparticles, and the effects of reductant concentration, polyvinylpyrrolidone (PVP) and inlet flow rate on the size, distribution and morphology of the synthesized silver nanoparticles are investigated comprehensively. The synthesized silver nanoparticles are characterized by UV-spectrometer and transmission electron microscopy (TEM). The experimental results show that the reductant concentration, PVP, and inlet flow rate have a direct impact on the size, distribution, monodispersity and morphology of the synthesized nanoparticles. The moderate reductant concentration makes the size of silver nanoparticles larger and the size uniformity is better. Adding PVP to the experimental reagent can prevent the aggregation of silver nanoparticles, consequently, the synthesized particles have a uniform distribution and a better morphology. The changes in inlet flow rate and Re directly affect the mixing efficiency, which in turn affect the formation of silver atoms and silver nanocrystal nuclei and have a greater impact on particle concentration. The proposed micromixer has excellent mixing performance and can be used in other fields such as controllable synthesis, biomedicine and microchemical systems.

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