Teaching
chemistry without access
to a traditional laboratory space
is an ongoing challenge that has become especially relevant because
of the SARS-CoV-2 pandemic. While several remote learning options
exist for covering general chemistry concepts (including kitchen-based
experiments, online modules, and virtual reality), few options provide
opportunities for hands-on learning about the chemistry of synthetic
polymer materials. Here, we offer remote learning modules that use
household adhesives as a platform for teaching polymer chemistry outside
of the laboratory. These modules are designed for students who have
taken at least one semester of organic chemistry and have varied hands-on
time commitments, ranging from 2 to 10 total hours each. Concepts
covered include polymer synthesis, intermolecular interactions, thermomechanical
properties, structure–function relationships, and molecular
design. The experiments described in these modules also give students
a chance to practice research-relevant skills such as searching for
primary literature sources, fabricating test samples, explaining unexpected
experimental results, and revising experimental procedures to improve
methodologies. Ultimately, these modules provide educators with an
additional tool for teaching experimental chemistry outside of the
laboratory.
Polyesters are a promising class of biocompatible polymer, however, their mechanical properties fall short of metals and ceramics. This paper covalently binds polyesters to graphenic moieties resulting in enhanced mechanical properties.
At-home water filters for drinking water are used by
over 100 million
Americans. These filters are successful at removing heavy metals from
drinking water; however, when heavy metals are present, filters can
reach saturation quickly. This currently requires a full filter replacement;
treating and regenerating (re-activating) the filter are not currently
recommended by filter manufacturers. Here, we present a sustainable
graphene-based water filter that can be regenerated by treatment with
hot (80 °C) water or vinegar (mild acid). The filter has multiple
desirable properties for heavy metal adsorption, including high surface
area, conjugation, and oxygen-containing functional groups. This regeneratable
filtration technology removes 3- to 65-fold more heavy metals (lead,
cadmium, and mercury) from tap water than activated charcoal. Further,
the filter can undergo a simple regeneration treatment, allowing for
up to 3 cycles of reuse before metal breakthrough occurs. Due to the
decreased frequency of filter replacement compared to current technologies,
this graphene-based water filter could seamlessly integrate into existing
at-home water filtration technologies, providing a more sustainable
filter option.
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