scholarly journals SINTESIS DAN STUDI STABILITAS NANOPARTIKEL PERAK TERTUDUNG ASAM SALISILAT

2019 ◽  
Vol 1 (3) ◽  
pp. 83
Author(s):  
Rizky Noviani Ridwan ◽  
Gusrizal Gusrizal ◽  
Nurlina Nurlina ◽  
Sri Juari Santosa
Keyword(s):  
Silver Nanoparticles ◽  
Salicylic Acid ◽  
Silver Nitrate ◽  
Stability Test ◽  
Capping Agent ◽  
Acid Solutions ◽  
Boiling Water Bath ◽  
Yellow Color ◽  
Size Of Particles ◽  
Average Size

Silver nanoparticles capped with salicylic acid have been synthesized by reduction of silver nitrate with salicylic acid without additional capping agent. In the formation of silver nanoparticles, the solution of silver nitrate was first mixed with the pH 11 salicylic acid solutions at a mole ratio of 1:40. The mixture was heated for 45 minutes in a boiling water bath. The formation of silver nanoparticles was indicated by the appearance of yellow color and monitored using UV-Vis spectrophotometer. The maximum peak of resulted silver nanoparticles appeared in the range of 410-420 nm with the average size of particles was 66±28 nm. Stability test over a period of 16 weeks showed that silver nanoparticles capped with salicylic acid were stable. The results of stability test show that salicylic acid simultaneously act as reducing as well as capping agent in the formation of silver nanoparticles.

Synthesis of Silver Nanoparticles Using Tyrosine as Reductor and Capping Agent

2020 ◽  
Vol 840 ◽  
pp. 360-367
Author(s):  
Desi Indriyani Saragih ◽  
Devita Cahyani Varin Arifin ◽  
Bambang Rusdiarso ◽  
Suyanta Suyanta ◽  
Sri Juari Santosa
Keyword(s):  
Silver Nanoparticles ◽  
Amino Acid ◽  
Reaction Time ◽  
Silver Nitrate ◽  
Color Change ◽  
Capping Agent ◽  
Boiling Water Bath ◽  
Round Shape ◽  
Tyrosine Concentration ◽  
Average Size

Synthesis and stability of silver nanoparticles (AgNPs) using tyrosine as a reducing and capping agent have been done. Synthesis of AgNPs was performed by mixing silver nitrate (AgNO3) solution as a precursor with tyrosine amino acid and heating it in a boiling water bath until characterized by the appearance of color change from colorless to yellow. Variations in pH, concentration, and reaction time affecting the formation of AgNPs were studied using UV-Vis spectrophotometry in the wavelength range of 300-700 nm as the main device. The synthesis was successfully conducted at pH 11 for 45 min with the optimum tyrosine concentration was 3 mM for 0.5 mM AgNO3. The optimum mole ratio AgNO3 0.5 mM to tyrosine 3 mM was 1:6. TEM and PSA characterizations showed that the particle was a round shape and 29.5 nm is average size, respectively.

scholarly journals Chitosan as a Capping Agent of Silver Nanoparticles

2021 ◽  
Vol 9 (1) ◽  
pp. 21-25
Author(s):  
Hanim Istatik Badi'ah
Keyword(s):  
Silver Nanoparticles ◽  
Stability Test ◽  
Capping Agent ◽  
Low Level ◽  
Yellow Color ◽  
The Stability

Silver nanoparticles have been developed in many applications because of their optical and reactivity properties. One of the disadvantages of silver nanoparticles is their low level of stability because their surface is easy to aggregate. It is necessary to have other materials such as chitosan as a capping agent on the surface of silver nanoparticles to prevent aggregation. This study aimed to determine the ability of chitosan as a capping agent for silver nanoparticles. The ability of chitosan was evaluated based on the stability test and characterization using a UV-Vis, PSA, and FTIR spectrophotometer. The silver nanoparticles formed producing a yellow color with a wavelength of 401 nm and a size of 13.48 nm. The volume of chitosan that gave optimal results in stabilizing silver nanoparticles was 2.0 mL.

Polyaniline-coated cellulose fibers decorated with silver nanoparticles

2008 ◽  
Vol 62 (2) ◽  
Author(s):  
Jaroslav Stejskal ◽  
Miroslava Trchová ◽  
Jana Kovářová ◽  
Jan Prokeš ◽  
Mária Omastová
Keyword(s):  
Silver Nanoparticles ◽  
Thermogravimetric Analysis ◽  
Aspect Ratio ◽  
Percolation Threshold ◽  
Silver Nitrate ◽  
Cellulose Fibers ◽  
Subsequent Reaction ◽  
Aniline Hydrochloride ◽  
Ammonium Peroxydisulfate ◽  
Average Size

AbstractCellulose fibers of 20 μm in diameter and aspect ratio of 2 or 10 were coated with protonated polyaniline (PANI) during the oxidation of aniline hydrochloride with ammonium peroxydisulfate in an aqueous medium. The presence of PANI has been proved by FTIR spectroscopy. The conductivity increased from 4.0 × 10−14 S cm−1 to 0.41 S cm−1 after coating the fibers with PANI. The percolation threshold in the mixture of original uncoated and PANI-coated fibers was reduced from 10 mass % PANI to 6 mass % PANI, as the aspect ratio changed from 2 to 10. The subsequent reaction with silver nitrate results in the decoration of PANI-coated cellulose fibers with silver nanoparticles of about 50 nm average size. The content of silver of up to 10.6 mass % was determined as a residue in thermogravimetric analysis. FTIR spectra suggest that the protonated emeraldine coating changed to the pernigraniline form during the latter process and, consequently, the conductivity of the composite was reduced to 4.1 × 10−4 S cm−1, despite the presence of silver.

scholarly journals Two Highly Stable Silver Nanoparticles: Surface Plasmon Resonance Spectra Study of Silver Nanoparticles Capped with m-Hydroxybenzoic Acid and p-Hydroxybenzoic Acid

Molekul ◽  
2018 ◽  
Vol 13 (1) ◽  
pp. 30 ◽  
Author(s):  
Gusrizal Gusrizal ◽  
Sri Juari Santosa ◽  
Eko Sri Kunarti ◽  
Bambang Rusdiarso
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Hydroxybenzoic Acid ◽  
Capping Agent ◽  
Long Term Stability ◽  
Yellow Color ◽  
Stability Data ◽  
The Stability

Silver nanoparticles capped with m-hydroxybenzoic acid and p-hydroxybenzoic have been successfully synthesized, but the long-term stability data of these silver nanoparticles are not available. In this paper, we report the stability of these two types of silver nanoparticles for a period of 40 weeks observation based on the change of surface plasmon resonance spectra of silver nanoparticles. Silver nanoparticles were synthesized by reduction of silver nitrate with m-hydroxybenzoic acid and p-hydroxybenzoic acid without addition of capping agent. The presence of silver nanoparticles was indicated by the appearance of yellow color due to the surface plasmon resonance of silver nanoparticles. The resulted silver nanoparticles were stored at room temperature and further UV-visible spectrophotometer was used to follow the change in surface plasmon resonance spectra. The surface plasmon resonance spectra of silver nanoparticles were overlapped for the first 18 weeks, followed by little change in the position of absorption maxima (lmax), peak intensity, and width of the absorption peak until the week of 40. Silver nanoparticles capped with m-hydroxybenzoic acid and silver nanoparticles capped with p-hydroxybenzoic acid were highly stable which should make them suitable for further applications. The results show the potential of m-hydroxybenzoic acid and p-hydroxybenzoic acid to become a new reducing agent in the synthesis of highly stable silver nanoparticles. The m-hydroxybenzoic acid and p-hydroxybenzoic acid appeared to act as both reducing and capping agent.

scholarly journals Stachybotrys chartarum: A Novel Biological Agent for The Extracellular Synthesis of Silver Nanoparticles and Their Antimicrobial Activity

2015 ◽  
Vol 18 (2) ◽  
pp. 75 ◽  
Author(s):  
Abdel Ghany Tarek Mohamed
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Stachybotrys Chartarum ◽  
Capping Agent ◽  
Extracellular Synthesis ◽  
Transmission Electron

Microbial assisted biosynthesis of nanoparticles is a rapidly progressing area of nanobiotechnology. Inthis paper Stachybotrys chartarum assisted extracellular synthesis of silver nanoparticles (AgNPs) is reportedwhen challenged with 1mM silver nitrate (AgNO3). The characterization of AgNPs was carried out visualobservation and UV-Vis spectrophotometry. Further analysis carried out by Fourier Transform InfraredSpectroscopy (FTIR), provides evidence for the presence of proteins as capping agent, which helps in increasingthe stability of the synthesized AgNPs. Transmission Electron Microscopy (TEM) investigations confi rmedthat AgNPs were formed. The synthesized silver nanoparticles were found in the range of 65-108 nm. Finally,the antimicrobial susceptibility of AgNPs synthesized was investigated which exhibited more potent activityagainst bacteria than fungi compared with using silver nitrate at concentration 1mM. Keywords: Antimicrobial activity, Stachybotrys chartarum, Silver nanoparticles

scholarly journals Silver Nanoparticles AgNPs Preparation by Chemical Method to Obtain Optimal Characteristics of The Pharmaceutical Form and Study Their Effect on The Leishmania Parasite in Laboratory: تحضير جسيمات الفضة النانوية AgNPs بالطريقة الكيميائية للحصول على الخصائص المثلى للشكل الصيدلاني المعتمد ودراسة تأثيرها على طفيلي الليشمانيا مختبريا

2021 ◽  
Vol 5 (3) ◽  
pp. 41-28
Author(s):  
Rama Muhamad Sattout, Ahmad Kamari, Muhamad Muayyad Bilal Rama Muhamad Sattout, Ahmad Kamari, Muhamad Muayyad Bilal
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Reduction ◽  
Leishmania Parasite ◽  
Force Microscopy ◽  
Atomic Force ◽  
Yellow Color ◽  
Artificial Environment ◽  
Pharmaceutical Form ◽  
Average Size ◽  
Hierarchical Morphology

This study aimed first to prepare silver nanoparticles AgNPs in a chemical reduction, The silver nanoparticles AgNPs properties were characterized using spectroscopy of Vision and UV- Visible (UV- Vis), and atomic force microscopy (AFM) and a ZetaSizer device. This study also aimed to study the results effect of preparing Silver nanoparticles on the Leishmania parasite using an artificial environment. The results of the spectrophotometer of the secondary silver solution with yellow color, showed maximum absorption at a wavelength of 400 mm, while the image of atomic force microscope (AFM) showed the hierarchical morphology shape of the prepared Silver nanoparticles with an average size of (10- 30 nm). Silver secondary particles were estimated with a diameter ranging from (12- 60 nm) and with good dispersion in water by ZetaSizer device. The results illustrated that the number of Promastigotes of the Leishmania parasite decreased after adding the Silver nanoparticles AgNPs in varying proportions, as the concentration of 500 μg/ml had the highest effect after 72 hours from incubation, and the percentage of remaining parasites was 5.2% comparing with the control percentage of 14.99%, while the value of IC50 was 253.075 μg/ml, The value of R2 = 0.8809, slope = 0.0478 after 24 hours from incubation.

Green Synthesis of Silver Nanoparticles Using Prunus Amygdalus Extract and their Anti-Microbial Activity

2015 ◽  
Vol 1119 ◽  
pp. 165-169
Author(s):  
S.K. Srikar ◽  
D.D. Giri ◽  
C. Upadhyay ◽  
P.K. Mishra ◽  
S.N. Upadhyay
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Single Step ◽  
Prunus Amygdalus ◽  
E Coli ◽  
Bacteriostatic Property ◽  
Silver Nitrate Concentration ◽  
Average Size ◽  
20 Nm ◽  
Sun Light

Highly stable silver nanoparticles synthesized in single-step green method by mixing silver nitrate and aqueous extract of Almond (Prunus amygdalus). Experiments were conducted to influence the change in the silver nitrate concentration and time on the synthesis of silver nanoparticles at room temperature under dispersed sun light. The almond extract acted both as the reducing and stabilizing agent for the synthesis of silver nanoparticles. The change in the color of the reaction mixture was monitored using UV-Visible spectrometry whereas particles synthesized were characterized using Scanning Electron Microscopy, Dynamic Light Scattering and Fourier Transform Infrared Spectroscopy. The synthesized nanoparticles were almost spherical in shape with an average size about 20 nm and they exhibited bacteriostatic property against E. coli.

scholarly journals RADIATION SYNTHESIS OF SILVER NANOPARTICLES/CHITOSAN AGAINST Corynespora cassiicola CAUSING LEAF FALL DISEASE ON RUBBER TREES

2018 ◽  
Vol 55 (1A) ◽  
pp. 45
Author(s):  
Le Thi An Nhien
Keyword(s):  
Silver Nanoparticles ◽  
Nitrate Solution ◽  
Average Particle Size ◽  
Silver Nitrate Solution ◽  
Average Particle ◽  
In Vitro Test ◽  
Corynespora Cassiicola ◽  
Size Of Particles ◽  
Average Size

In this study, silver nanoparticles (AgNPs) were prepared by gamma rays irradiation of 1.0, 2.5, 5.0 and 10 mM silver nitrate solution using chitosan as a stabilizer. UV spectra, morphology and size of AgNPs irradiated at different doses were characterized by using UV-vis spectrophotometer and TEM images. The obtained results indicated that the average size of AgNPs increased by the increase of silver concentration in irradiated solution or the degree of acetylation of chitosan, while the increase of chitosan concentration was found to be a functional key for reducing the average size of particles in AgNPs product. In vitro test, AgNPs inhibited the growth of Corynespora cassiicola. In particularly, the inhibitory efficiency of AgNPs on the growth of C. cassiicola on rubber leaf extract media increased from 52.1 to 100 % when the average particle size of particles in AgNPs product decreased from 15 to 5 nm at the concentration of 50 ppm. In addition, the increase of AgNPs concentration from 10 to 90 ppm also enhanced the antifungal activity to be from 6.3 to 100 %, respectively. It suggests that the silver nanoparticles/chitosan (AgNPs/chitosan) synthesized by γ-rays irradiation method is a very promising fungicidal product applying for treating C. cassiicola, a serious pathogen fungus on rubber trees.

Preparation of Silver Nanoparticles in Poly(N-vinylpyrrolidone)/Ethanol Solutions

2017 ◽  
Vol 16 (05n06) ◽  
pp. 1750008 ◽  
Author(s):  
Shu Zhang ◽  
Yongan Tang ◽  
Branislav Vlahovic
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Weight Ratio ◽  
Plasmon Resonance Peak ◽  
X Ray ◽  
Transmission Electron ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Average Size

Silver nanoparticles have been synthesized from Poly(N-vinylpyrrolidone) (PVP)/ethanol solutions, and six different PVP to silver nitrate weight ratios (PVP:AgNO3) are studied in reduction of silver nitrate in ethanol with the presence of PVP as a stabilizer. The produced silver nanoparticles showed strong plasmon resonance peak centered at around 405[Formula: see text]nm in UV-Vis spectra. The particle morphologies were also examined and compared under secondary electron microscopy (SEM) and transmission electron microscopy (TEM). Energy dispersion X-ray spectroscopy (EDX) was utilized to determine the formation of silver nanoparticles. We found that the particle size and morphology were strongly dependent on the PVP:AgNO3 weight ratio. The average size of silver particles decreased from 19.25[Formula: see text]nm to 10.03[Formula: see text]nm as the weight ratio of PVP:AgNO3 increased from 1:1 to 20:1.

scholarly journals Designing Fructose Stabilized Silver Nanoparticles for Mercury(II) Detection and Potential Antibacterial Agents

2018 ◽  
Vol 15 (3) ◽  
pp. 241-249 ◽  
Author(s):  
Sameena Mehtab ◽  
M.G.H. Zaidi ◽  
Tanveer Irshad Siddiqi
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Agents ◽  
Vital Role ◽  
Xrd Pattern ◽  
Microbiological Test ◽  
Highly Active ◽  
Yellow Color ◽  
Average Size ◽  
Microscopy Images ◽  
Solution Changes

The synthesis of fructose stabilize silver nanoparticles (AgNPs) was attempted in the proposed work. It was found that developed AgNPs played an important role as colorimetric nanoprobes for the estimation of metal ions. The prepared AgNPs were characterized by UV-Vis, IR, XRD, SEM techniques. XRD-pattern of AgNPs, concluded that particles are well dispersed and present in a fcc system and average size was found to be 16.6 nm. AgNPs displayed specific and sensitive recognition to Hg2+ by colorimetric analysis, as in the presence of Hg2+ ions yellow color of AgNPs solution changes to colorless. Synthesized AgNPs also play vital role in antimicrobials. Microbiological test shows that AgNPs are highly active against E.Coli and provide a safer alternative to conventional antibacterial agents. The optical florescence’s microscopy images of AgNPs shows good florescent results, which showed AgNPs with fructose capping agents, might be used as fluorescent sensing materials to sense biological materials.

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