Web page characteristics of educational adaptive web sites

Eremić, Željko; Radosav, Dragica

doi:10.7251/jit1301020e

Cited by 1 publication

(2 citation statements)

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“…The Wards method was applied for hierarchical cluster analysis (HCA) as previously reported. 29,30 Furthermore, pixel-based spot analysis and ferret diameter-based spot circularity analysis were performed with R 31 and imageJ software. 32 ■ RESULTS AND DISCUSSION Nanoparticle-Packed Porous Substrates.…”

Section: ■ Experiments Preparation Of the Nanoparticle-packed Porousmentioning

confidence: 99%

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Chemically Resistant Perfluoroalkoxy Nanoparticle-Packed Porous Substrates and Their Use in Colorimetric Sensor Arrays

Patil¹,

Lee²,

Yun³

et al. 2018

Langmuir

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To create printing substrates for colorimetric sensor arrays, chemically resistant membranes are prepared by coating cellulose filter paper with perfluoroalkoxy (PFA) polymer nanoparticles. A water-based fluorothermoplastic polymer dispersion was diluted with an organic solvent that causes weak aggregation of polymer nanoparticles. The resulting solution improved adhesion between the polymer and the cellulose membrane, providing a more mechanically stable substrate. These PFA polymer-coated substrates demonstrated superior chemical resistance against strong alkalines and had relatively uniform nanoporous structures that substantially improved the printability of a colorimetric sensor array. Finally, colorimetric sensor arrays printed on these substrates were evaluated for the detection of four different toxic industrial chemicals (e.g., ammonia, hydrogen sulfide, nitrogen dioxide, and sulfur dioxide) at or below their permissible exposure limits.

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Section: ■ Experiments Preparation Of the Nanoparticle-packed Porousmentioning

confidence: 99%

“…As summarized in Table 3, we measured the viscosities of parent PFA solutions (20,30,40, and 50 w/v %) and PFA solutions 2 h after acetone addition. As can be predicted in the Einstein equation (η = η 0 (1 + 2.5ϕ)), the solution viscosity increased as the acetone concentration increased.…”

Section: ■ Experiments Preparation Of the Nanoparticle-packed Porousmentioning

confidence: 99%