Glass microspheres are spheres of glass technically manufactured with a diameter in the micrometer range (from 1 to 1000 (microns))[1], although the term is also used for a wider range of 100 nanometres to 5 millimetres. Hollow glass microspheres, sometimes termed microballoons, have diameters ranging from 10 to 300 micrometers (microns)[2]. Glass can be made transparent and flat, or into other shapes and colours as shown in this ball from the Verrerie of Brehat in Brittany. ... A micrometre (American spelling: micrometer), symbol µm, is an SI unit of length. ... To help compare different orders of magnitude this page lists lengths between 10-6 and 10-5 m (1 µm and 10 µm). ... To help compare different orders of magnitude this page lists lengths between 10-3 m and 10-2 m (1 mm and 1 cm). ... To help compare different orders of magnitude this page lists lengths between 10-7 and 10-6 m (100 nm and 1 µm). ... To help compare different orders of magnitudes this page lists lengths between 10-9 m (metre) and 10-8 m (1 nm and 10 nm). ... To help compare different orders of magnitude this page lists lengths between 10-3 m and 10-2 m (1 mm and 1 cm). ... To help compare different orders of magnitude this page lists lengths between 10 micrometre and 100 micrometre (10-5 m and 10-4 m). ... (Redirected from 1 E 4 m) To help compare different orders of magnitude this page lists lengths between 10 and 100 km (104 to 105 m). ... A micrometre (American spelling: micrometer), symbol µm, is an SI unit of length. ...

Selected uses of solid spheres are: calibrating measuring systems, sieve and filter calibration, reflective markings, abrasives, binder spacings. Hollow spheres have uses ranging from storage and slow release of pharmaceuticals and radioactive tracers to research in controlled storage and release of hydrogen. Calibration refers to the process of setting the magnitude of the output (or response) of a measuring instrument to the magnitude of the input property or attribute within specified accuracy and precision. ... In chemistry and common usage, a filter is device (usually a membrane or layer) that is designed to block certain objects or substances whilst letting others through. ... An abrasive is usually a material that is used to smooth or to machine another softer material through extensive rubbing. ... A binder is a material used to bind together two or more other materials in mixtures. ... Pharmacology (in Greek: pharmacon is drug, and logos is science) is the study of how chemical substances interfere with living systems. ... A radioactive tracer is a substance containing a radioactive isotope (radioisotope). ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ...

Hollow spheres are also used as a lightweight filler in composite materials such as syntactic foam. Microballoons give syntactic foam its light weight, low thermal conductivity, and a resistance to compressive stress that far exceeds that of other foams [3]. These properties are exploited in the hulls of submersibles and deep-sea oil drilling equipment, where other types of foam would implode. Hollow spheres of other materials create syntatic foams with different properties, for example ceramic balloons can make a light syntatic aluminium foam.(Foams on the Cutting Edge) Aggregate is the component of a composite material used to resist compressive stress. ... Composite materials (or composites for short) are engineered materials made from two or more constituent materials that remain separate and distinct on a macroscopic level while forming a single component. ... In physics, thermal conductivity, k, is the intensive property of a material that indicates its ability to conduct heat. ... Compressive stress is the stress applied to materials resulting in their compaction (decrease of volume). ... A submersible is a type of underwater vessel with limited mobility, intended to remain in one place during use. ... Nuclear Weapon Implosion Implosion is a process in which objects are destroyed by collapsing in on themselves. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ...

Glass microspheres can be made by heating tiny droplets of dissolved water glass in a process known as ultrasonic spray pyrolysis, and properties can be improved somewhat by using an acid treatment to remove some of the sodium [4]. Sodium silicate, also known as water glass, is a compound used in cements and textile processing. ... A baby in its mothers womb, viewed in a sonogram Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kiloHertz/20,000 Hertz. ... Simple sketch of pyrolysis chemistry Pyrolysis usually means the chemical decomposition of organic materials by heating in the absence of oxygen or any other reagents, except possibly steam. ... General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22. ...

References

1. Syntactic foam properties & applications
2. Microballoon synthesis & thermal properties.
3. Syntactic foam buoyancy applications