The properties of superalloys are usually deteriorated by the coarsening of nano-sized γ'phase,which is the primary strengthening component at high *** the γ'phase represents one of the key challenges in dev...
The properties of superalloys are usually deteriorated by the coarsening of nano-sized γ'phase,which is the primary strengthening component at high *** the γ'phase represents one of the key challenges in developing next-generation ***,we fabricate a cobalt-base superalloy with nanoscale coherent γ'phase(Ni,Co)3(Al,Ti,Nb),which is isolated by stacking-fault ribbons in the alloy matrix as a result of Suzuki segregation of alloying atoms,and demonstrate that this new nanostructure can slow down the coarsening of γ'phase at high *** a result,the Co-Ni-base superalloy displays a considerably high tensile-yield point exceeding 1650 MPa at room temperature and 1250 MPa at 1073 K,which are markedly higher than those of the commonly used nickel-and cobalt-base superalloys,thereby paving a new way for developing superalloys with exceptional mechanical performances and thermal stability.
Nitric oxide(NO)is an important signaling molecule in the cardiovascular *** secreted by the endothelium holds important physiological function in maintaining the vessel patency and promoting tissue *** group has prev...
Nitric oxide(NO)is an important signaling molecule in the cardiovascular *** secreted by the endothelium holds important physiological function in maintaining the vessel patency and promoting tissue *** group has previously prepared polysaccharide-and peptide-based NO-releasing biomaterials by conjugation of glycosylated NO donors,which are highly stable and only decompose to release NO under the catalysis of *** two biomaterials showed significant effect in treatment of mouse hindlimb ischemia and skin *** can also be used as carrier for the delivery of stem cells,and improved therapeutic effect was observed in mouse myocardial infarction *** addition,enzyme prodrug threapy(EPT)technique was employed to develop enzyme-functionalized vascular graft which can catalyze exogenously supplied prodrug to release NO locally and *** vivo implantation by replacing rat abdominal aorta demonstrated that NO releasing plays an important role in reducing thrombus formation and promoting neo-tissue formation.
Cobalt/polypyrrole(Co/PPy)nanocomposites were prepared via an in situ oxidation polymerization of pyrrole in an aqueous dispersion of Co nanoparticles(NPs).The Co/PPy nanocomposites showed good electromagnetic propert...
Cobalt/polypyrrole(Co/PPy)nanocomposites were prepared via an in situ oxidation polymerization of pyrrole in an aqueous dispersion of Co nanoparticles(NPs).The Co/PPy nanocomposites showed good electromagnetic properties because of the coexistence of magnetic loss and dielectric loss to electromagnetic *** electromagnetic wave absorbing bandwidth(reflection loss ＜-10 dB)for Co/PPy(30 wt％in a paraffin matrix)was located at 11.7-16.47 GHz with a thickness of 2 mm,and with a maximum reflection loss(around-33 dB)at 13.6 *** interestingly,the electromagnetic wave absorbing properties of the nanocomposites can be easily controlled by tuning the ratio of the two components in the *** improved electromagnetic wave absorption may be attributed to the excellent electromagnetic match at the corresponding resonance peaks for dielectric and magnetic *** magnetic nanoparticles/conducting polymer nanocomposites are great potential candidates for use as electromagnetic wave absorbents due to their excellent properties such as wide absorbing frequency,strong absorption,good compatibility,low density and controllable absorbing properties.
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