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One study proposes polyaniline nanofiber composites with metal salts for the detection of hydrogen sulfide. [14] Hydrogen sulfide is a weak acid that is dangerous at low ppm, but polyaniline nanofibers can only give a robust response to strong acids. Metal salts can react with hydrogen sulfate to form a metal sulfide precipitate and a strong acid.
Anton Formhals was the first person to attempt nanofiber production between 1934 and 1944 and publish the first patent describing the experimental production of nanofibers. [29] In 1966, Harold Simons published a patent for a device that could produce thin and light nanofiber fabrics with diverse motifs. [35]
Electrospinning extracts nanofibers from polymer solutions (synthesized by the sol-gel process) and collects them to form nonwoven nanofabrics. [19] A strong electric field is applied to the solution to charge the polymer strands. The solution is put into a syringe and aimed at an oppositely charged collector plate.
The field-induced promotion of electrons from the valence to conduction band of semiconductors (the Zener effect) can also be regarded as a form of field emission. [19] Composite materials; Scanning probe microscopy tips Scanning probe microscopy (SPM) is a branch of microscopy that forms images of surfaces using a physical probe that scans the ...
Nanocelluloses form oil-in-water emulsions with a droplet size in the range of 4-10 μm that are stable for months and can resist high temperatures and changes in pH. [ 70 ] [ 71 ] Nanocelluloses decrease the oil-water interface tension [ 72 ] and their surface charge induces electrostatic repulsion within emulsion droplets.
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Indeed, among emerging products one can name nanofiber filters, carbon nanotubes and various nanoparticles. [12] Nanotechnology is expected to deal more efficiently with contaminants which convectional water treatment systems struggle to treat, including bacteria, viruses and heavy metals.