Synthesis of Silver Nanoparticles by Chemical Reduction Method: Effect of Reducing Agent and Surfactant Concentration

Ghazali, Suriati; Jaafar, Mariatti; Aziz, Azizan

doi:10.15282/ijame.10.2014.9.0160

Cited by 110 publications

(68 citation statements)

References 13 publications

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“…There are various methods to synthesize the Agnp. In general, the synthesis method can be divided into 3 (three) methods, namely the physical 6 , chemical 7 , and biological or green chemistry method. 8 All of these synthesis methods involve the use of reductants and stabilizers as the precursors.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticle and Its Antibacterial Activity

2017

RJC

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Silver nanoparticle (Ag-np) was successfully synthesized by using the simple green chemistry method. Its antibacterial activity was studied against Staphylococcus aureus and Escherichia coli according to agar well diffusion method. The green synthesis was carried out by mixing the silver nitrate, glucose, and starch as precursors at 90 0 C for 4 hours. The UV-Vis spectra show the characteristic of spherical Ag-np in the range of 410-425 nm and it is confirmed by TEM image. The Ag-np has an average diameter of 8.41 ± 4.37 nm. As the reductant mole composition increases, the SPR decreases and shifts to red due to the further growth of the Ag-np. When the stabilizer composition increases, the SPR intensity also increases and shifts to red. The formed Ag-np is stable even after one-month synthesis. The antibacterial test on the Ag-np was carried out against gram-positive bacteria (Staphylococcus aureus) and gram-negative bacteria (Escherichia coli). The result shows that a higher concentration of Ag-np is required to kill Staphylococcus aureus compared to Escherichia coli.

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Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticle and Its Antibacterial Activity

2017

RJC

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“…On the other hand, Agglomeration of particles will take place if the reaction rate is too slow. Moreover, the choice of the surfactant is critical since it determines the stability, solubility, reactivity, dispersibility and even the size and shape of the nanotubes during the synthesis [24]. The unique crystal form of HNTs and the surface is characterized by hydroxyl with a lower level of density that permits smooth diffusion in a polymer matrix compared to other nanoclays.…”

Section: Introductionmentioning

confidence: 99%

Morphology and tensile properties of thermoplastic polyurethane-halloysite nanotube nanocomposites

Gaaz

Sulong²,

Akhtar

et al. 2015

Int. J. Automot. Mech. Eng.

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The high aspect ratio of nanoscale reinforcements enhances the tensile properties of a pure polymer matrix. Researchers have reported the morphology and tensile properties of thermoplastic polyurethane and halloysite nanotube (TPU-HNTs) nanocomposites, formed through compression moulding processes. Few researchers have reported on TPU-HNTs formed through injection moulding. Therefore, the present work investigates the tensile properties of TPU and HNT nanocomposites via injection moulding. TPU and HNTs were mixed using a brabender mixer with concentrations ranging from 1wt.% to 15wt.% and varying mixing parameters (i.e., mixing speed, mixing time, and mixing temperature). Tensile bars were injection moulded by varying the moulding parameters (i.e., injection temperature, injection time, and injection pressure). A significant increment of tensile strength was found at 1wt.% HNT reinforcement. TPU-HNT nanocomposite with 1wt.% reinforcement exhibited tensile strength of 24.3 MPa, which was higher than that of pure TPU. The Young's modulus of the TPU-15wt.% HNT nanocomposite was 21.5 MPa. Thus, TPU-HNT had improved mechanical properties, compared to pure TPU, due to the addition of a nanofiller.

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“…Due to the problem of aggregation of nanoparticles brought about by their high surface energy (Pal et al, ), capping agents and dispersing agents are used to stabilize them. Selection of the capping/stabilizing agents is important as it contributes to determination of their stability, solubility, dispersibility, reactivity, and shape and size of silver nanoparticles (AgNPs) during the synthesis (Suriati et al, ). A number of capping agents such as poly acrylic acid, poly vinyl pyrrolidone, poly vinyl alcohol, polysaccharide, and l ‐glutathione have been reported to stabilize nanoparticles (Wang et al, ; Atta et al, ).…”

Section: Introductionmentioning

confidence: 99%

One‐pot microwave‐assisted synthesis of size‐dependent l‐glutathione‐capped spherical silver nanoparticles suitable for materials with antibacterial properties

Nyamu

Ombaka

Masika

et al. 2019

J of Interdiscip Nanomed

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In the last years, there has been an alarming increase in antibiotic resistance by pathogenic microbes, which has become a major public health concern. There is a great interest in developing new antimicrobial for reducing the impact. Silver nanoparticles (AgNPs) as antibacterial agents are currently being studied to be used to fight these pathogenic microbes. The aim of the present study was to synthesize AgNPs of different sizes through the use of microwave and determine their antimicrobial activities. Synthesis of sizedependent L-glutathione-capped spherical nanoparticles through one-pot microwave synthesis was achieved, and their antimicrobial properties were determined. Different sizes of AgNPs between 5-10, 15-35, and 50-80 nm were made by varying the concentration of silver nitrate and using sodium borohydride (NaBH 4 ) as a reducing agent. L-glutathione was used to stabilize the AgNPs to prevent them from aggregation in the colloidal solution.The synthesized AgNPs showed ultraviolet absorption at around 400 nm with high concentration of AgNO 3 having sharp peaks. The formed particles were crystalline in nature with uniform spherical shape. The formed AgNPs were of crystalline size of 9. 94, 18.45, 34.96, 52.40, and 58.50 nm. Fourier transform infrared analysis confirmed conjugation of glutathione as a capping agent to AgNPs as the result of the formed spectra showing the absence of ─SH stretch. The high temperature generated by microwave helped to synthesize nanoparticles within a short time and by varying the concentration of AgNO 3 helped obtain the desired particle size. Glutathione conjugated well with AgNPs as a result of interaction of negative thiol resulting to colloidal stabilization and reduced aggregation. The antibacterial activity of AgNPs was found to be size dependent with the smaller size of 9.94 nm being more efficient than 18. 45, 34.96, 52.40, and 58.50 nm against the tested strains Bacillus subtilis (ATCC 6633), Escherichia coli (ATCC 25922), Salmonella spp. (ATCC 700623), and Staphylococcus aureus (ATCC 25923). Of the four stains, E. coli was found to be the least affected by all three different particle sizes of the synthesized AgNPs.

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Synthesis of Silver Nanoparticles by Chemical Reduction Method: Effect of Reducing Agent and Surfactant Concentration

Cited by 110 publications

References 13 publications

Green Synthesis of Silver Nanoparticle and Its Antibacterial Activity

Green Synthesis of Silver Nanoparticle and Its Antibacterial Activity

Morphology and tensile properties of thermoplastic polyurethane-halloysite nanotube nanocomposites

One‐pot microwave‐assisted synthesis of size‐dependent l‐glutathione‐capped spherical silver nanoparticles suitable for materials with antibacterial properties

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