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it's so small🤏, so it could be inhaled pretty easily. As not all properties are currently known, they might be hazardous❗️ for our lungs.

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Carbon nanotubes can also be used to reinforce polymers to create very strong plastics.

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It is extremely small and lightweight which make it an excellent replacement for metallic wires. Carbon nanotube is also resistance to temperature changes

Uses

A Carbon nanotube is well suited for anything that required high strength, durability, electrical conductivity, thermal conductivity.

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When their size is in the range of micrometer, they are visible on skin as a thin opaque white layer which can make customer decided not to buy sunscreens product containing them.

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Silver or silver nanoparticles: A hazardous threat to the environment and human health? ERR Dak

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The average size is 100 nanometer.

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Nanomaterials can be created as the by-products of combustion reactions, or be produced through engineering to perform a specialised function. Nanomaterial is also being used for healthcare and cosmetics to environmental preservation and air purification.

Nanoparticles are now being used in the manufacturing of scratch-resistant eyeglasses,crack resistant paint, anti-graffiti coating for walls, transparent sunscreen, stain repellent fabric,self cleaning windows amd ceramic coatings for solar cells(device that convert light energy into electrical energy)

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Osmosis
Properties of silver nanoparticles

Because silver, like other noble metals, exhibits a size and shape dependent optical effect known as localized surface plasmon resonance (LSPR) at the nanoscale, the ability to synthesize Ag nanoparticles in different shapes vastly increases the ability to tune their optical behavior.

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it is used to treat and prevent minor skin irritations such as burns, cuts and diaper rash. It is used in products such as baby powder and barrier creams to treat diaper rashes, calamine cream, anti-dandruff shampoos, antiseptic ointments, sunscreens.
its used in making sunscreen because it is very gentle on the skin and is less likely to cause irritation. it also prevent protection from UVB all the way through to UV-A1 meaning that your skin is getting the best sun protection

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Silver nanoparticles are nanoparticles of silver of between 1 nm and 100 nm in size. While frequently described as being 'silver' some are composed of a large percentage of silver oxide due to their large ratio of surface to bulk silver atoms.

diagram of silver nanoparticles

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Titanium dioxide nanoparticles are Particles of Titanium dioxide with a diameter less than 100 nm.
Its formulae is TiO 2

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Particles that has the size between 1-100 nanometers.

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If inhaled into blood stream can be harmful and toxic . It may cause Lung inflammation and heart problems. It can damage DNA and cause cancer.

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It is so small it can go from blood stream through the brain. It can take some toxic chemical through as well.

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A fullerenes is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to seven atoms.

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Silver nanoparticles account for greater than 23% of all nanoproducts and have been widely used for diagnostic and therapeutic applications (e.g. in wound healing, arthritic disease, etc.). These have been widely known for their antibacterial, antifungal, and antiviral effects.

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Silver nanoparticles account for greater than 23% of all nanoproducts and have been widely used for diagnostic and therapeutic applications (e.g. in wound healing, arthritic disease, etc.). These have been widely known for their antibacterial, antifungal, and antiviral effects.

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This Is The Atomic Structure For Titanium Dioxide

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This Is The Atomic Structure For Titanium Dioxide

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It's a white powder that is insoluble in water. it's a compound with the formula ZnO.

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-Asbestos is one of the first technologically to use nanomaterials. Asbestos is  composed of long and thin fibrous crystals, the fibers are hollow rods of inner diameter 13 nm and outer diameter 26 nm. Asbestos can also cause cancer through inhaling the nanoparticles in to the blood stream causeing lungs inflamation.

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It is nearly insoluble in water, but it will dissolve in most acids, such as hydrochloric acid.

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Introduction video of Silver Nanoparticles

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Introduction video of Silver Nanoparticles

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It is approximately 0.7 nm in diameter.

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One of the major advantages for titanium dioxide is its resistance to discolouration under ultraviolet (UV) light in exposed applications.

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Due to the information above, Titanium dioxide is used in products such as paints and coatings, including glazes and enamels, plastics, paper, inks, fibres, foods, pharmaceuticals and cosmeti

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Inhalation: At high concentrations: can irritate the nose and throat.

Skin Contact: May cause mild irritation.

Eye Contact: May cause slight irritation as a "foreign object"

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An advantage nanoparticles are targeting drugs/medicines to a specific location in the body. Transparent on skin for cosmetic uses.sunscreen contain nanoparticles and is highly effective in absorbing UV light but also absorb visible light through diffusion and photosynthesis.

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Zinc Oxide can affect you when breathed in.  Exposure to Zinc Oxide can cause “metal fume fever.” This is a flu-like illness with symptoms of metallic taste in the mouth, headache, fever and chills, aches, chest tightness and cough.

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-Unique molecular structure
-Can easily react with radicals
-Can form conjugates with proteins and DNA
-Localization

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One of the most important uses of fullerene is medicine but they can also be used for other things like antiviral drugs, anti-aging and anti-damage agent in the cosmetic sector and antioxidants

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The International Agency for Research on Cancer has classified titanium dioxide as “possibly carcinogenic to humans,” based on studies that showed increased lung tumors in rats associated with titanium dioxide inhalation.

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Titanium dioxide is a white pigment used in paint, sunscreen, cosmetics, paper, toothpaste, and many other products. One of titanium's characteristics is extremely high strength to weight ratio. Although it is 60% denser than aluminum, it is more than twice as strong.

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-High molecular weight
-Short wavelength absorption
-Highly hydrophobic meaning that they repel water
-Prone to aggregation
-Paradoxically can be anti-oxidants
-Lack of fluorescence emission for imaging

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-Can cause brain damage in fish
-Exposure through direct dermal application of fullerenes present in cosmetics
-No estimates to all fullerenes types and chronic exposure can be made

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- Each fullerene molecule has a cage-like structure in which all carbon atoms are set on the surface of a nearly spherical shape
- Fullerenes can contain 60,70, 78 or even more number of carbon atoms
- A fullerene is any molecule composed entirely of carbon, in the form of a hollow sphere, ellipsoid, or tube
- Spherical fullerenes are called buckyballs, and they resemble the balls used in association football
- Fullerene was found in 1985 by Robert Curl, Harold Kroto and Richard Smalley at the University of Sussex  and Rice University, and was named after Buckminster Fuller because his famous Geodesic domes are similar in shape.

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The synthesis of silver nanoparticles by sodium borohydride (NaBH₄) reduction occurs by the following reaction: Ag⁺ + BH₄− + 3 H₂O → Ag⁰ +B(OH)₃ +3.5 H. The reduced metal atoms will form nanoparticle nuclei. Overall, this process is similar to the above reduction method using citrate.

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Carbon nanotubes are a tube made of carbon and it is measured in nanometer. It's consist of a hexagonal arrangement. It can be formed by rolling-up a single sheet of graphene.
Size
The diameter of the carbon nanotube is 0.4-10nm
The length is 0.14nm to 55.5 cm

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CNTs thermal conductivity is better than that of a diamond.

(Thermal conductivity can be defined as the rate at which heat is transferred by conduction through a unit cross-section area of a material when a temperature gradient exists perpendicular to the area.)

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1-100 nanometers. But nanoparticles can be use to describe something that is about 500 nanometers as well. Or maybe sometimes could use to describe a fiber or tube which is less than 100 nanometers from one end to the other.