We prepared Ni nanoparticle-deposited silica (SiO 2 ) microspheres using a method based on the collision of Ni nanoparticles, which were generated by hydrogen reduction of NiCl 2 , with SiO 2 microspheres. SiO 2 microspheres were heated in a gas-phase reactor to a temperature su ciently high to soften their surfaces. Notably, when SiO 2 microspheres were heated to temperatures higher than 973 K before collision with Ni nanoparticles, the nanoparticles showed no signs of sintering on the SiO 2 microsphere surfaces during heat treatment at a high temperature of 1,073 K. In addition, we independently controlled the diameter and content of Ni nanoparticles on the SiO 2 microspheres by changing NiCl 2 evaporation temperature and NiCl 2 -carrier gas ow rate.
Recent studies have reported that coronavirus disease-2019 (COVID-19)
vaccination can exacerbate asthma. Status asthmaticus sometimes induces
takotsubo cardiomyopathy. We present a case of takotsubo cardiomyopathy
triggered by asthma exacerbation after the mRNA-based vaccination.
Therapies for status asthmaticus resulted in prompt improvement of
respiratory failure and cardiac-apex ballooning.
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