2 research outputs found
Color Transferability from Solution to Solid Using Silica Coated Silver Nanoparticles
The interpretation of color change in sensors and tests
can be
linked to incorrect conclusions if the intrinsic color changes are
not accounted for. In this work, we study the intrinsic color change
associated with the process of embedding nanoparticles in a polymer
to create nanocomposite films. We present a safer, faster method to
coat silver nanoparticles with silica and employ a seven-factor Plackett–Burman
design to identify critical factors in the synthesis. Silver nanodisks
with increasing thicknesses of the silica shell showed a decreasing
sensitivity of their localized surface plasmon resonance (LSPR) toward
changes in the refractive index surrounding the nanoparticle. A color
shift of up to 72 nm was observed when bare nanoparticles were embedded
in poly(vinyl alcohol), but no color change was perceived when nanoparticles
were coated with a 25-nm-thick silica shell. Understanding the origin
of color changes intrinsic to the preparation of polymeric nanocomposites
aids in the design and correct use of plasmonic sensors
Inquiry-Based Labs Using Paper Microfluidic Devices: The MICRO Project
The MICRO project has developed a series of active-learning labs that can be safely delivered to students either at home or in person using paper microfluidic technology. The skills covered in these labs are appropriate for sophomore-level analytical chemistry courses and general chemistry.<br /