Physics

Difference between Mirror and Lens

Difference between Mirror and Lens

In simple terms, mirror means a smooth and highly polished glass surface, through which images are formed by reflection, as the light falls on it. A plane mirror gives a real-looking undistorted image, while a curved mirror may distort, magnify, or reduce the image in various ways. A lens is a pa.....

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Iron Oxide Nanoparticles

Iron Oxide Nanoparticles

Iron Oxide Nanoparticles Iron oxides are common natural compounds and can also easily be synthesized in the laboratory. Iron oxide nanoparticles are iron oxide particles with diameters between about 1 and 100 nanometers. The two main forms are magnetite (Fe3O4) and its oxidized form maghemite (γ.....

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Superparamagnetism – a form of magnetism

Superparamagnetism – a form of magnetism

Superparamagnetism is a property occurring principally in small, single-domain magnetic particles without magnetic memory. It is a form of magnetism that appears in small ferromagnetic or ferrimagnetic nanoparticles. It is more closely related to ferromagnetism than to paramagnetism. In sufficien.....

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Magnetoelastic filaments

Magnetoelastic filaments

Magnetoelastic filaments Magnetoelasticity is the effect of elastic strain upon the magnetization of a ferromagnetic elastic material (as when the magnetization of a steel spring varies as it vibrates). Magnetoelastic filaments are one-dimensional composite structures that exhibit both magnetic a.....

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Colloidal Gold

Colloidal Gold

Colloidal Gold A gold colloid is a suspension consisting of sub-micron gold nanoparticles suspended within a solvent, most often water. It is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. The colloid is usually either an intense red color (for spherical particl.....

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Electrospray Ionization – a soft ionization technique

Electrospray Ionization – a soft ionization technique

Electrospray Ionization – a soft ionization technique Electrospray ionization (ESI) generates intact gas-phase ions from analytes in the solution for mass spectrometric investigations. It is a technique used in mass spectrometry to produce ions using an electrospray in which a high voltage .....

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Acoustic Levitation – a method for suspending matter in the air against gravity

Acoustic Levitation – a method for suspending matter in the air against gravity

Acoustic levitation uses acoustic radiation forces to counteract gravity and suspend objects in mid-air. It is a method for suspending matter in the air against gravity using acoustic radiation pressure from high-intensity sound waves. The idea that something so intangible can lift objects can se.....

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Aerodynamic Levitation – the use of gas pressure to levitate materials

Aerodynamic Levitation – the use of gas pressure to levitate materials

In aerodynamic levitation, solids and liquids are floated in a vertical gas stream. Aerodynamic levitation is the use of gas pressure to levitate materials so that they are no longer in physical contact with any container. Container less processing or ‘levitation’ is a valuable tool for the s.....

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Casimir Effect – in quantum field theory

Casimir Effect – in quantum field theory

Casimir Effect – in quantum field theory The Casimir effect is a small attractive force that acts between two close parallel uncharged conducting plates. In quantum field theory, the Casimir effect and the Casimir–Polder force are physical forces arising from a quantized field. It is caus.....

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Clinostat – an apparatus for studying tropisms in plants

Clinostat – an apparatus for studying tropisms in plants

A clinostat is an apparatus for studying tropisms in plants, usually a rotating disc to which the plant is attached so that it receives an equal stimulus on all sides. It is a device that uses rotation to negate the effects of gravitational pull on plant growth (gravitropism) and development (gra.....

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Tractor Beam

Tractor Beam

A tractor beam is a device with the ability to attract one object to another from a distance. In science fiction, it is a hypothetical beam of energy that can be used to move objects such as spaceships or hold them stationary. The main challenge of building a tractor beam is pretty intuitive. Whe.....

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Anti-gravity – a hypothetical force

Anti-gravity – a hypothetical force

Anti-gravity is the antithesis of gravity; a hypothetical force by which a body of positive mass would repel a body of negative mass. It also is known as a non-gravitational field is a hypothetical phenomenon of creating a place or object that is free from the force of gravity. It is a hypothetic.....

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