Ultimate Manipulation of Magnetic Moments in the Golden Tetrahedron Au₂₀ with a Substitutional 3d Impurity

Nanocluster systems that are electronically stable and highly magnetic have been of intense research interest due to their potential as magnetic superatoms. In this study, we consider a more intriguing case of the unique golden pyramid with a substitutional 3<i>d</i> impurity. In particular, we investigate the geometry, stability, and magnetic properties of Au₁₉M clusters (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, and Cu) by means of density functional theory calculations. It is found that the structural patterns of doped species evolve from endohedrally doped cages to exohedrally doped tetrahedrons when M goes from Sc to Cu. The robustness of the Au₂₀ unit tends to be retained in its tetrahedral doped counterparts. Remarkably, the quenched magnetic moment of Au₂₀ increases in a systematic manner with the appearance of 3<i>d</i> impurities. We demonstrate that not only the interaction between the magnetic impurity and valence electrons of the Au host but also the itinerant behavior of the impurity valence states have been taken into account to understand the magnetism of Au₁₉M clusters

Large-Area, Conductive and Flexible Reduced Graphene Oxide (RGO) Membrane Fabricated by Electrophoretic Deposition (EPD)

A large-area, conductive, and flexible membrane made from the stabilized aqueous solution of reduced graphene oxide (RGO) is successfully fabricated using an electrophoretic deposition (EPD) method. A low-voltage operation of EPD (∼3 volts) allows a robust consolidation of RGO layers desirably aligned in the in-plane direction through the cohesive electrophoretic squeezing force near the current collector. Transferring the deposited RGO layers to arbitrary substrates or achieving as a free-standing form, two methods of “chemical etching” and “electrochemical etching” are developed to detach the RGO layers from the EPD current collector without damaging the deposited RGO. Further reducing the free-standing RGO membrane by thermal annealing up to 1000 °C, a graphite-like architecture is restored (<i>d</i>-spacing at 3.42 Å with C/O ratio at 16.66) and the electrical conductivity increases as high as 5.51 × 10⁵ S/m. The tightly-consolidated and securely-detached RGO membrane allows the free-standing and flexible features and highly conductive characteristics, which are further developed during thermal treatment. Because of the facile scale-up nature of the EPD process and RGO solution, the developed methodology has a considerable potential to be applied to various energy storage devices, flexible conductive coatings, and other electrochemical systems

Characteristics of dengue patients.

<p>Characteristics of dengue patients.</p

Receiver operating characteristic (ROC) curves comparing antithrombin III and angiotensinogen markers for SD-SPL prediction.

<p>Area under the curve (AUC) for antithrombin III = 0.85, AUC for angiotensinogen = 0.83 and AUC for combination of two markers = 0.87.</p

Biological analysis of identified proteins using PANTHER classification.

<p>Biological analysis of identified proteins using PANTHER classification.</p

Western-blot analysis validating iTRAQs results for angiotensinogen and antithrombin III.

<p>Representative protein bands in DWS (n = 10) and SD-SPL (n = 6) for AGT (A) and for AT III (C). Quantification of relative protein expression of AGT (B) and AT III (D), based on normalized densitometry to healthy control, *p < 0.05.</p

List of differentially expressed plasma proteins of SD-SPL compared with those of DWS (p<0.05).

<p>List of differentially expressed plasma proteins of SD-SPL compared with those of DWS (p<0.05).</p

Identification of angiotensinogen (AGT) and antithrombin III (AT III) proteins.

<p>Representative precursor ion and MS/MS spectra of reporter ions from peptide ALQDQLVLVAAK and DPTFIPAPIQAK of AGT (A) and from peptide RVWELSK and ATEDEGSEQKIPEATNR of AT III (B). Quantification was derived from the signal intensities of eight iTRAQ reporter ions.</p

Multivariate logistic regression analysis of SD-SPL predictive diagnosis.

<p>Multivariate logistic regression analysis of SD-SPL predictive diagnosis.</p

Study profile.

<p>Of 113 patients enrolled, 63 had laboratory-confirmed dengue infection. One patient hospitalized in shock presentation was excluded. Six SD-SPL and ten DWS, with early stage plasma collected, were included in the current study.</p