The rapid development of portable flexible electronic devices means a multifunctional composite film with excellent thermal management capability, high electromagnetic interference (EMI) shielding, and a strong fire safety performance is urgently required. In this paper, inspired by a "brick-mortar" sandwich structure, phase change capsules (PCCs) and MXene nanosheets are prepared. Subsequently, a one-step vacuum-assisted filtration method is used to fabricate a multifunctional flexible PCC/MXene/polyvinyl alcohol (PMP) phase change composite film with high light-to-thermal conversion efficiency, Joule heating generation, fire safety, and EMI shielding effects. The superior preparation technology endows the film with multi-source driven thermal management capabilities and excellent EMI shielding effectiveness values (43.13 dB). In addition, the PMP film exhibits good flexibility and high enthalpy (136.8 J g −1 ). Surprisingly, the PMP film's excellent fire safety properties improve its reliability and safety. In summary, the simple preparation technique and outstanding overall performance of the PMP films provide broad application prospects in advanced thermal management and EMI shielding in wearable products.
Pulverized
rice husks are co-fired with natural gas in a 100 kW
(rated) down-fired oxy-fuel combustor under two conditions: (1) air
combustion (denoted as air) and (2) oxy-combustion with 70% O2 and 30% CO2 in the inlet oxidant gas (denoted
as OXY70). Studied in this paper are (1) mechanisms governing the
partitioning of inorganic matter within the fly ash aerosol and (2)
how these affect mechanisms of deposition on heat transfer surfaces.
In each case, the ash aerosol particle size distributions (PSDs) were
determined using electric mobility/light scattering instruments (scanning
mobility particle sizer/aerodynamic particle sizer) and a Berner low-pressure
impactor, where the latter collected size-segregated aerosol for subsequent
analysis. The ash deposition rate was measured experimentally using
a specially designed probe, and its relationship with aerosols was
explored. The properties of the deposits were also investigated using
a laser diffraction particle size analyzer for PSDs and scanning electron
microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction
for compositions. The data show that, in comparison to air, OXY70
produces greater amounts of sub-micrometer aerosols as a result of
increased mineral vaporization at the higher flame temperature. Cl
and P are combined with K to form KCl and KPO3 in the sub-micrometer
but not in the super-micrometer aerosols. For both conditions, the
particle sizes within the more loosely bound outside deposits are
much larger than those within the tightly bound inside deposits. Except
for S and Cl, the deposit compositions do not differ much between
air and OXY70. Inside deposition rates show a positive correlation
with the concentration of sub-micrometer particles, which is consistent
with previous findings on coal combustion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.