Concerning nanotechnological consumer products, the most rapidly growing is the use of nanoparticles (NPs).(47) So far the knowledge regarding the safety aspects of NPs is still in its initial phase and greater efforts is needed to understand the interaction of NPs with the human body. (48) Several studies have reported that NPs always showed more serious toxicity than bulks and suggested that their size and the dose were the key factors influencing NPs toxic effects.(49) Despite of this, large…
use of silver nanoparticles, it is more likely to disperse in water bodies via discharge from household, textile and food industries. Due to the nanosize (1 – 100 nm) it can easily penetrate the skin, tissues and organs of a fish. The route of exposure to fish can be via gills, skin or ingested water and/or food. The poor food intake can lead to retarded growth and/or malfunction/formation of organs and also result in mortality by starvation and toxicity induced by silver nanoparticles. The…
citrate binds with the particle coating and dispels the repulsion between silver nitrate nanoparticles. The nanoparticles then form an aggregate-- a loose group of particles. Batch C was resistant to aggregate formation. It did not include glucose, which reduces the silver nitrate and allows it to react with sodium citrate. The data from these batches was not within the wavelength window of silver nanoparticles…
be used as the host fluid for nanofluid synthesis. The dispersion of nanoparticles in a base fluid has been done either by a two-step method or by a single step method. In either case, a well-mixed and uniformly dispersed Nanofluid is needed for successful reproduction of properties and interpretation of experimental data. As the name implies the two step method involves two stages, first stage is the processing of nanoparticles following a standard physical or chemical method and in the second…
AgNO3 by NaBH4 in water. Wiley and his coworkers synthesized three different shapes of silver nanoparticles using chemical method, in which ethylene glycol used as both solvent and reducing agent [5]. This group synthesized cubic silver nanoparticles by reduction of silver nitrate (AgNO3) with ethylene glycol in the presence of Polyvinylpyrrolidone (PVP) and HCl. After synthesis the cubic silver nanoparticles were isolated by centrifugation then washed with water to remove ethylene glycol and…
into just silver, while soluble starch stabilizes the nanoparticles by surrounding them to prevent aggregation (1, 2, 3). The 1 M NaOH, 1 M HCl, and 1 M NaCl caused Batch A to aggregate. The nanoparticles aggregated with these reagents because these are all strong bases or strong acids, which dissociates completely and interacts with the oxidized citrate that separate the nanoparticles, destroying the “citrate shield” away. Thus, the nanoparticles were attracted to each other, and then…
Silver nanoparticles have unique antimicrobial properties. They have a variety of applications: diagnostics, wound healing, pharmaceuticals, etc. These nanoparticles destroy bacterial cells walls and interrupt membrane integrity by their electrostatic attraction to the negatively charged bacterial cell walls [10]. Metal nanoparticles are usually synthesized by chemical techniques which is costly and highly toxic. Currently, there is a growing demand for alternative methods that would limit the…
gold nanoparticles as color indicators for the existence of melamine in unknown solutions of milk, then use UV/Vis spectra to quantify the results. The purpose of this lab was met successfully. The color change of gold nanoparticle solution was an effective method to predict the presence of melamine. For instance, when 1 ml of AuNPs was added to 1 mL of 50 ppm melamine solution in sample C1, the color changed from wine red to light purple, which indicates that aggregation of the nanoparticles…
co-doped HA (different La concentrations of 0.03, 0.06 and 0.1M) nanoparticles are analyzed by FESEM images are shown in Fig. 3 (a)-(f). The morphology of pure HA shown in Fig 3 (a) indicates that formation of spherical (or) chain pearl shape of nanoparticles, ranging from 70 to 84nm. Further, Sr (0.1M) doped HA and La (0.1M) doped HA belongs to Fig.3 (b)-(c), appears the formations of few agglomerated spherical-like nanoparticles range between 60-74nm are observed. The morphology of the La/Sr…
p-Nitrophenol and Hexacyanoferrate (III) by Borohydride Using Green Synthesized Gold Nanoparticles, G. Bhagavanth Reddy.; D. Ramakrishna,; A. Madhusudhan,; D. Ayodhya,; M. Venkatesham and G. Veerabhadram*.Journal of Chinese Chemical Society. 17, 2015; 420-428. 2. G.Bhagavanth Reddy,; A. Madhusudhan,; D. Ramakrishna,;D.Ayodhya,;M. Venkatesham.; G. Veerabhadram,; Green chemistry approach for the synthesis of gold nanoparticles with gum kondagogu: characterization, catalytic and antibacterial…