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Who found nanoparticles?
Michael Faraday is generally considered to be the first person to conduct scientific research on nanoparticles.
Do nanoparticles have colors?
We cant really see nanoparticles to tell if they have colours, some do depending on what they are made from, but more commonly we see nanoparticles as a suspension in water, ethanol or some other solvent. These solutions can give rise to some intense colours, this is due to raylaigh scattering that takes place from the nanoparticles. A phemonon called surface plasmon resonance also has a part to play in the colours that we see for colloidal nanoparticles.
What is the role of surfactant in nanoparticle synthesis?
Surfactants are used in nanoparticle synthesis to control particle size, shape, and stability. They help in preventing agglomeration of nanoparticles by acting as a protective layer around them, and also facilitate the dispersion of nanoparticles in the reaction medium. Surfactants can influence the growth kinetics of nanoparticles and play a crucial role in determining the final properties of the synthesized nanoparticles.
What are the main concerns about nanoparticles?
The main concerns about nanoparticles relate to their potential adverse effects on human health and the environment. There is a concern that nanoparticles can penetrate cells and tissues, leading to inflammation or other toxic effects. Additionally, the long-term environmental impact of nanoparticles is not yet fully understood, and there is concern about their bioaccumulation in organisms and potential disruption of ecosystems.
How are nanoparticles used in socks?
Nanoparticles are often embedded in the fabric of socks to provide various benefits, such as odor control, moisture-wicking, and antibacterial properties. These nanoparticles can help improve comfort, performance, and hygiene when wearing socks.
What nanoparticles are in a swimsuit?
Some swimsuits are made with nanoparticles such as titanium dioxide or silver nanoparticles. Titanium dioxide nanoparticles can provide UV protection, while silver nanoparticles may help inhibit bacterial growth and odor.
What is the difference between silver particles and silver nanoparticles?
Silver particles typically refer to any form of silver that is in a particulate or powdered form, whereas silver nanoparticles specifically refer to silver particles that are nanoscale in size (1-100 nanometers). Silver nanoparticles have unique properties due to their small size, such as increased surface area and potential for enhanced reactivity.
How is the size of silver nanoparticles different to normal silver particles?
Silver nanoparticles are typically smaller than normal silver particles, with diameters typically ranging from 1 to 100 nanometers. This smaller size gives silver nanoparticles unique physical and chemical properties compared to larger silver particles. These properties are due to the large surface area to volume ratio of nanoparticles, leading to increased reactivity and different optical, electronic, and catalytic behavior.
Why are silver nanoparticles more effective than normal sized silver particles?
Silver nanoparticles have a larger surface area compared to normal sized silver particles, which allows for increased interaction with microbes. This leads to better antimicrobial activity due to the silver nanoparticles being able to release more silver ions. Additionally, the smaller size of nanoparticles enables them to penetrate cell walls more easily, enhancing their effectiveness in killing bacteria and other pathogens.
Why can nanotechnology umbrella has anti-bacteria effect?
Nanotechnology umbrellas are often coated with nanoparticles, like silver or titanium dioxide, which have antimicrobial properties. These nanoparticles can disrupt the cell walls of bacteria, inhibiting their growth and reproduction. This makes the umbrella surface less hospitable for bacteria to thrive on, therefore reducing the risk of bacterial contamination.
What are some of the environmental concerns about silver nano technology?
The main environmental concern is the amount of silver involved. Some believe it to affect living cells. There is also concern that the silver could seep into the sewer systems and affect the purification process of waste water.
What is formed when aqueous silver nitrate solution is exposed to light?
When aqueous silver nitrate solution is exposed to light, it undergoes a photochemical reaction and forms silver nanoparticles. This is a result of the reduction of silver ions by the photons in the light. These silver nanoparticles can be visually observed as a cloudy appearance in the solution.
How do you prepare nanoparticles?
There are a number of different synthetic routes to produce silver nano particles. One of these methods is the wet chemistry method. There are also several wet chemical methods for creating silver nanoparticles. Typically, these involve the reduction of a silver salt such as silver nitrate with a reducing agent like sodium borohydride in the presence of a colloidal stabilizer. Sodium borohydride has been used with polyvinyl alcohol, poly(vinylpyrrolidone), bovine serum albumin (BSA), citrate and cellulose as stabilizing agents. In the case of BSA, the sulfur-, oxygen- and nitrogen-bearing groups mitigate the high surface energy of the nanoparticles during the reduction. The hydroxyl groups on the cellulose are reported to help stabilize the particles. Citrate and cellulose have been used to create silver nanoparticles independent of a reducing agent as well. An additional novel wet chemistry method used to create silver nanoparticles took advantage of ß-D-glucose as a reducing sugar and a starch as the stabilizer.
How are nanoparticles constructed in to mascara's?
Nanoparticles are put into mascara\'s to reduce clumping. Nanoparticles are made out of the soot from a candle flame.
What is aggregation of nanoparticles?
Aggrgation of nanoparticles is where they stick together. This is undesirable in nanoparticle solutions, we want each nanoparticle to remain seperate. To combat this differing amounts of salts can be added to stop agglomeration, sodium citrate is one that is used for silver and gold nanoparticles. The zeta potential of the nanoparticle is a masure of its overall charge, ideally we want nanoparticles with a high positive or negative zeta potential as like charges repel each other and will stop nanoparticles from agglomerating.
Why are nanoparticles used in textiles?
because teh nanoparticles are so good
Does temperature effect plastic?
yes, temperature does effect plastic if it gets to hot it can melt it.
