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Dr. Ronald  Soriano  Dc image

Dr. Ronald Soriano Dc

11365 Quincy St
Moreno Valley CA 92555
951 438-8463
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #: 30939
NPI: 1598927378
Taxonomy Codes:
111N00000X

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Publications

Size as a Parameter to Stabilize New Phases: Rock Salt Phases of PbmSb2nSem+3n. - Journal of the American Chemical Society
A series of PbmSb2nSem+3n nanocrystals (m = 2, 4, 6 and 8; n = 1) are demonstrated that exist only as a distinct phase on the nanoscale. The nanocrystals aggregates are new compounds adopting the cubic NaCl-type structure. These materials form aggregates comprised of nanocrystallites that are attached at a preferred orientation. Elemental compositions were studied using the complementary techniques of scanning transmission electron microscopy/energy dispersive X-ray spectroscopy and inductively coupled plasma-atomic emission spectroscopy. The new ternary nanocrystal aggregates are moderately monodisperse and exhibit well-defined band gap energies in the mid-IR region. The PbmSb2nSem+3n nanomaterials behave as homogeneous solid solutions with lattice parameter trending as a function of Sb incorporation at room temperature and tend to phase separate into PbSe and Sb2Se3 at 400 °C.
Nanoscale stabilization of new phases in the PbTe-Sb2Te3 system: Pb(m)Sb(2n)Te(m+3n) nanocrystals. - Journal of the American Chemical Society
A series of novel rock-salt-type Pb(m)Sb(2n)Te(m+3n) nanocrystals (m = 2, 3, 4, 6, 8, and 10; n = 1 and 2) were successfully prepared using a colloidal synthesis route. These materials are stable only on the nanoscale and have no bulk analogues. Elemental compositions were determined using scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy (STEM/EDS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The nanocrystals exhibit well-defined band energies in the mid-IR region that are nearly independent of their atomic compositions. Pb(m)Sb(2n)Te(m+3n) nanocrystals behave as metastable homogeneous solid solutions at room temperature and tend to phase separate into the respective binary PbTe + Sb(2)Te(3) at 300 °C. Furthermore, pair distribution function (PDF) analysis suggests that the local structure of these Pb(m)Sb(2n)Te(m+3n) nanocrystals is distorted with respect to the rock-salt structure.
Cubic form of Pb(2-x)Sn(x)S2 stabilized through size reduction to the nanoscale. - Journal of the American Chemical Society
We demonstrate the synthesis of semiconductor Pb(2-x)Sn(x)S(2) nanocrystals with a cubic rock salt crystal structure in a composition range where this structure is unstable in the bulk. The cubic Pb(2-x)Sn(x)S(2) nanocrystals were prepared using a modified hot injection colloidal synthetic route. The x value is in the range 0.40 < x < 1. Even though these compositions lie in a region of the PbS-SnS phase diagram where no single phase exists, and despite the fact that PbSnS(2) is a distorted orthorhombic phase, the Pb(2-x)Sn(x)S(2) nanocrystals are single phase solid solutions with cubic NaCl-type structure. Experimental evidence for this derives from powder X-ray diffraction (PXRD), electron diffraction, and pair distribution function (PDF) analysis. Elemental compositions determined using scanning transmission electron microscopy/energy dispersive spectroscopy (STEM/EDS), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and electron energy loss spectroscopy (EELS) reveal a composition close to the nominal ones. The band gaps of the Pb(2-x)Sn(x)S(2) nanocrystals (0.52-0.57 eV) are blue-shifted by quantum confinement relative to that of the hypothetical cubic PbSnS(2) phase which density functional theory (DFT) calculations show to be much narrower (0.2 eV) than in the case of orthorhombic PbSnS(2) (1.1 eV). The Pb(2-x)Sn(x)S(2) nanocrystals exhibit a well-defined band gap in the near-IR region and are stable up to ~300 °C above which they phase separate into cubic PbS and orthorhombic α-SnS.

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