A monolithic 3D-printed microfluidic device integrated with stacked layers of functionalized leukodepletion channels and microfiltration for the negative enrichment of circulating tumor cells directly from clinically relevant volumes of whole blood.
Previous research has demonstrated that amine polymers
rich in
primary and secondary amines supported on mesoporous substrates are
effective, selective sorbent materials for removal of CO
2
from simulated flue gas and air. Common substrates used include
mesoporous alumina and silica (such as SBA-15 and MCM-41). Conventional
microporous materials are generally less effective, since the pores
are too small to support low volatility amines. Here, we deploy our
newly discovered zeolite nanotubes, a first-of-their-kind quasi-1D
hierarchical zeolite, as a substrate for poly(ethylenimine) (PEI)
for CO
2
capture from dilute feeds. PEI is impregnated into
the zeolite at specific organic loadings. Thermogravimetric analysis
and porosity measurements are obtained to determine organic loading,
pore filling, and surface area of the supported PEI prior to CO
2
capture studies. MCM-41 with comparable pore size and surface
area is also impregnated with PEI to provide a benchmark material
that allows for insight into the role of the zeolite nanotube intrawall
micropores on CO
2
uptake rates and capacities. Over a range
of PEI loadings, from 20 to 70 w/w%, the zeolite allows for increased
CO
2
capture capacity over the mesoporous silica by ∼25%.
Additionally, uptake kinetics for nanotube-supported PEI are roughly
4 times faster than that of a comparable PEI impregnated in SBA-15.
It is anticipated that this new zeolite will offer numerous opportunities
for engineering additional advantaged reaction and separation processes.
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