We describe a simple and cost-effective strategy for rapid fabrication of microfluidic paper-based analytical devices and valves by inkjet printing. NaOH aqueous solution was printed onto a hydrophobic filter paper, which was previously obtained by soaking in a trimethoxyoctadecylsilane-heptane solution, allowing selective wet etching of hydrophobic cellulose to create hydrophilic-hydrophobic contrast with a relatively good resolution. Hexadecyltrimethylammonium bromide (CTMAB)-ethanol solution was printed onto hydrophobic paper to fabricate temperaturecontrolled valves. At low temperature, CTMAB deposited on the paper is insoluble in aqueous fluid, thus the paper remains hydrophobic. At high temperature, CTMAB becomes soluble so the CTMAB-deposited channel becomes hydrophilic, allowing the wicking of aqueous solution through the valve. We believe that this strategy will be very attractive for the development of simple micro analytical devices for point-of-care applications, including diagnostic testing, food safety control, and environmental monitoring. V C 2015 AIP Publishing LLC.
Based on the development trend of internet+ and the popularization of mobile intelligent terminals, anti-counterfeiting based on two-dimension code is also paid more and more attention by people. How to achieve higher anti-counterfeiting function through two-dimension code and realize product traceability and data statistics under the era of big data is one of the hot spots for people's research. How to prevent the counterfeit of two-dimensional code is the key point of Internet of things, Internet+ era under the hot spots of people's anti-counterfeiting research, this paper introduces the development of two-dimensional code technology and popular QR code technology which is popular and efficient nowadays. Similarity and Difference of Mainstream Two-dimensional Code RecognitionQR Code is a type of 2D [1] barcode that was invented and started to be used by Japanese Toyota subsidiary Denso Wave in 1994. The QR code can store more information than an ordinary barcode, nor does it need to be aligned like a normal barcode with the scanner in a straight line [2] . Two-dimensional code technology can be divided into two kinds of layered and matrix. Identification Mechanism [2,3] : Cascading is identified by the width of the black-and-white lines. The matrix is identified by the relative color difference of the black-and-white color blocks. The dark color module represents "1" in binary, and the light color module represents "0" in binary. So the general matrix is used to ensure that the color of a certain color.Reading range: stacked identification equipment and bar code recognition angle difference of ± 10 ° or so, the basic matrix can achieve 360 ° scan recognition.Reading speed: One of the fastest QR code, which basically dozens of each second, and Data Matrix code and PDF417 basic speed of several per second. Effective QR Code TechnologyQR code involves a variety of technologies: physical anti-counterfeiting technology, traceability technology, digital technology, holographic technology. The most prominent feature is the dependence on special equipment is relatively small, and the relative low cost, which is now second dimensional code is still one of the main reasons for the market share, and the current QR code is largely open source algorithm, it is easy to be copied.At present, the two-dimensional code technology that can achieve security is basically a combination anti-counterfeiting technology, which can be summarized as the following two-dimensional code and security code [2] , a combination of special ink and two-dimension code, a combination of specific holography technology and two-Technology and two-dimensional code combination, special APP and two-dimensional code technology, watermarking technology and two-dimensional bar code technology, invisible two-dimensional code technology.
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