Generation of fluidic LiBH 4 molecules, f-LiBH 4 , was demonstrated by NMR spectroscopy of LiBH 4 bulk powder mixed with silica scaffold surface materials under minor heat treatment. In the presence of the fumed silica or mesoporous LiBH 4 shows increased translational mobility at relatively low temperature (ca. 95 °C) and becomes liquid-like by evidence from 1 H− 11 B J-coupling in 1 H and 11 B MAS NMR or substantial line narrowing of 7 Li static NMR. This high diffusional mobility of LiBH 4 at the molecular level has never been seen for bulk LiBH 4 , and the property is attributed to the interfacial interaction with the mesoporous scaffold surfaces. While f-LiBH 4 facilitates the confinement of LiBH 4 itself into various scaffold materials, LiBH 4 migrates along the SBA-15 surface to reach other metal borohydride particles, Ca(BH 4 ) 2 in this case, and promotes the formation of similarly fluidic LiBH 4 −Ca(BH 4 ) 2 composite (LC solid solution) for coconfinement into mesopores. In situ variable temperature (VT) NMR spectroscopy detects the coinfiltration process of eutectic LiBH 4 −Ca(BH 4 ) 2 composite (LC) into mesopores of SBA-15. The infiltration rates measured for LiBH 4 bulk powder or LC composite showed dependence on pore sizes (MCM-41 vs SBA-15) and heat treatment conditions (static vs MAS).
Takotsubo cardiomyopathy is a form of non-ischemic cardiomyopathy characterized by transient systolic dysfunction. The prevalence of Takotsubo cardiomyopathy has been estimated to be about 2% overall but about 10% amongst women presenting with clinical manifestations of acute coronary syndrome. The overall mechanism of the disease still remains unclear. However, treatment of Takotsubo cardiomyopathy appears to be similar to congestive heart failure (CHF) medical management. This case highlights the classic presentation exhibited very similar to acute coronary syndrome and diagnostic criteria for Takotsubo (stress-induced) cardiomyopathy.
Silica scaffolding: By employing functionalized mesoporous SBA-15 silica, novel fluorescent cruciform-silica hybrid materials are generated which preserve the desirable solution properties of cruciforms in the solid state for potential use in sensory schemes. Preserving the solution properties of functional fluorophores upon incorporation into solid state sensory schemes remains a significant challenge. To address this concern, a silica scaffold was employed to support functional fluorophores in the solid state. Herein, we report an effort to support 1,4-distyryl-2,5-bisarylethynylbenzene cruciforms (XFs) using functionalized mesoporous silica particles. By employing surface-functionalized mesoporous SBA-15 silica, novel fluorescent cruciform-silica hybrid materials are generated which retain the desirable solution properties of cruciforms in the solid state. Organic surface functionalities, such as acidic, basic, and hydrophobic groups employed on the silica scaffold, modulate the observed emissions of the resulting solid state materials. The potential of these XF-silica hybrid materials to display sensory responses to representative vapor-phase analytes is demonstrated.
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