In this study, the spreading of a liquid droplet on the surface of a fibrous paper and its penetration into the paper is studied.
This presented μPAD can be easily fabricated through wax printing by using a solid ink printer which deposits wax onto the surface of a chromatographic paper, and then baked on a hotplate by penetrating the molten wax into the paper to create a hydrophobic barrier.
The method is based on the diazotization reaction of dapsone (4,4′-diamino-diphenyl sulphone, DAP) and (naphthyl)ethylenediamine hydrochloride (NED) with nitrite in acidic medium, yielding a coloured compound on the surface of a filter paper.
The method is based on the complexation reaction of furosemide (5- aminosulfonyl -4-chloro-2- furanylmethyl)amino)benzoic acid, dissolved in ethanol, with FeCl3 and the surfactant dodecyltrimethylammonium bromide (DTAB) in aqueous solution, yielding a colored compound on the surface of a filter paper.
Brodin et al. quoted from a study by Syverud and Stenius [45]: "Therefore, introduction of a strong CNF layer on the surface of a base paper may have only minor influence on the tensile index.
The sensing mechanism was based on the proteolytic activity of S. aureus proteases on a specific peptide substrate, sandwiched between magnetic nanobeads and gold surface on top of a paper support.
RUN a fingernail across the specially prepared surface of a sheet of paper, and smells emerge.
Use the third dimension, in front of or behind the surface of a piece of paper or a computer screen, for foreign policy.
USING A 3D PRINTER is like printing a letter; hit the print button on a computer screen and a digital file is sent to, say, an inkjet printer which deposits a layer of ink on the surface of a piece of paper to create an image in two dimensions.
Paper formation (the level of homogeneity in the distribution of fibers on the surface of paper) is a key quality parameter for paper products, being currently monitored off-line, at low sampling rates relatively to the high production speeds achieved with modern paper machines.
