169 research outputs found
The Willingness toward Vaccination: A Focus on Non-Mandatory Vaccinations
The Special Issue "The Willingness toward Vaccination: A Focus on Non-mandatory Vaccinations", published in the journal Vaccines, has the main aim of gathering more data on vaccine hesitancy and the willingness of individuals to receive vaccinations, particularly in the context of non-mandatory vaccines. The aim is to address vaccine hesitancy and improve vaccine coverage rates, in addition to identifying the determinants of vaccine hesitancy itself. This Special Issue garners articles that examine the external and internal factors that can influence the decision-making process of individuals regarding vaccination. Given that vaccine hesitancy is present in a significant part of the general population, it is crucial to have a better analytical understanding of the areas where hesitancy arises to determine appropriate strategies to address this issue
Silk reinforced with graphene or carbon nanotubes spun by spiders
Here, we report the production of silk incorporating graphene and carbon
nanotubes directly by spider spinning, after spraying spiders with the
corresponding aqueous dispersions. We observe a significant increment of the
mechanical properties with respect to the pristine silk, in terms of fracture
strength, Young's and toughness moduli. We measure a fracture strength up to
5.4 GPa, a Young's modulus up to 47.8 GPa and a toughness modulus up to 2.1
GPa, or 1567 J/g, which, to the best of our knowledge, is the highest reported
to date, even when compared to the current toughest knotted fibres. This
approach could be extended to other animals and plants and could lead to a new
class of bionic materials for ultimate applications
Scalable production of graphene inks via wet-jet milling exfoliation for screen-printed micro-supercapacitors
The miniaturization of energy storage units is pivotal for the development of
next-generation portable electronic devices. Micro-supercapacitors (MSCs) hold
a great potential to work as on-chip micro-power sources and energy storage
units complementing batteries and energy harvester systems. The scalable
production of supercapacitor materials with cost-effective and high-throughput
processing methods is crucial for the widespread application of MSCs. Here, we
report wet-jet milling exfoliation of graphite to scale-up the production of
graphene as supercapacitor material. The formulation of aqueous/alcohol-based
graphene inks allows metal-free, flexible MSCs to be screen-printed. These MSCs
exhibit areal capacitance (Careal) values up to 1.324 mF cm-2 (5.296 mF cm-2
for a single electrode), corresponding to an outstanding volumetric capacitance
(Cvol) of 0.490 F cm-3 (1.961 F cm-3 for a single electrode). The
screen-printed MSCs can operate up to power density above 20 mW cm-2 at energy
density of 0.064 uWh cm-2. The devices exhibit excellent cycling stability over
charge-discharge cycling (10000 cycles), bending cycling (100 cycles at bending
radius of 1 cm) and folding (up to angles of 180{\deg}). Moreover, ethylene
vinyl acetate-encapsulated MSCs retain their electrochemical properties after a
home-laundry cycle, providing waterproof and washable properties for
prospective application in wearable electronics
- …