N-Halamine compounds have attracted great attention
because they are recognized as promising antibacterial agents to control
microbial contamination; however, most of the research interests were
focused on N-halamines that contain N–Cl bond(s)
rather than N–Br bond(s). In this contribution, we report the
facile fabrication of N–Br bond-containing N-halamine nanofibers using the electrospinning method for antibacterial
usages. The as-produced N–Br bond-containing N-halamine nanofibers (i.e., DBDMH/PAN nanofibers) comprise an antibacterial
component of 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) and a support
component of polyacrylonitrile (PAN). When systematic characterizations
were carried out, the as-obtained DBDMH/PAN nanofibers were proven
to exhibit well-defined fiber-like morphology and be highly efficient
in the killing of the selected model bacteria (Escherichia
coli). Their morphology and size could be well governed by
tuning the concentration of electrospinning precursor and the mass
ratio of PAN to DBDMH. The antibacterial mechanism of the DBDMH/PAN
nanofibers and their stabilities under dry, wet, and bacterial conditions
were confirmed as well. Facile synthesis and antibacterial activity
allow the feasibility of the final N–Br bond-containing N-halamine nanofibers for antibacterial-related clinical
applications in practice. Our work highlights the development of the
N–Br bond-containing N-halamine nanofibers
as promising antibacterial agents for biomedical applications.
Design
and fabrication of highly sensitive and flexible sensors
is an area of intense interest and research but is limited with respect
to the detection range and application (e.g., deployment in both terrestrial
and aquatic environments). Here, we present flexible pressure sensors
(FPSs) comprising graphene–PANI-embedded polyethylene oxide
and exhibiting ultralow detection limits. These sensors were prepared
using a modified electrohydrodynamic (EHD) jetting method and enabled
wearable monitoring of physiological parameters and selective aquatic
life activity. Sensor thickness, resistance, and sensitivity were
modulated through jetted layers. Through EHD jetting, the minimum
detected static pressure was seen to be 12 Pa. The strain resistance
test displayed a gauge factor of 5.5 under a bending strain of 12.5–50%.
FPS engineering was performed using a green, sustainable, and cost-effective
approach and demonstrated high sensitivity, ultralow detection limits,
rapid response, and excellent mechanical durability. Detection of
minute signals during physical activity (e.g., finger movements, facial
expression, cough, hand gestures, acoustic vibrations, and real-time
pulse waves of near-body states) was shown. Furthermore, real-time
detection of underwater activity elucidates the potential in emerging
healthcare, environmental, and bio-related monitoring.
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