101
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Fulton JL, Bylaska EJ, Bogatko S, Balasubramanian M, Cauët E, Schenter GK, Weare JH. Near-Quantitative Agreement of Model-Free DFT-MD Predictions with XAFS Observations of the Hydration Structure of Highly Charged Transition-Metal Ions. J Phys Chem Lett 2012; 3:2588-2593. [PMID: 26295879 DOI: 10.1021/jz3008497] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
First-principles dynamics simulations (DFT, PBE96, and PBE0) and electron scattering calculations (FEFF9) provide near-quantitative agreement with new and existing XAFS measurements for a series of transition-metal ions interacting with their hydration shells via complex mechanisms (high spin, covalency, charge transfer, etc.). This analysis does not require either the development of empirical interparticle interaction potentials or structural models of hydration. However, it provides consistent parameter-free analysis and improved agreement with the higher-R scattering region (first- and second-shell structure, symmetry, dynamic disorder, and multiple scattering) for this comprehensive series of ions. DFT+GGA MD methods provide a high level of agreement. However, improvements are observed when exact exchange is included. Higher accuracy in the pseudopotential description of the atomic potential, including core polarization and reducing core radii, was necessary for very detailed agreement. The first-principles nature of this approach supports its application to more complex systems.
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102
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Malliakas CD, Yao J, Wells DM, Jin GB, Skanthakumar S, Choi ES, Balasubramanian M, Soderholm L, Ellis DE, Kanatzidis MG, Ibers JA. Oxidation State of Uranium in A6Cu12U2S15 (A = K, Rb, Cs) Compounds. Inorg Chem 2012; 51:6153-63. [DOI: 10.1021/ic300172k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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103
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Shyam B, Chapman KW, Balasubramanian M, Klingler RJ, Srajer G, Chupas PJ. Structural and Mechanistic Revelations on an Iron Conversion Reaction from Pair Distribution Function Analysis. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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104
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Koo B, Xiong H, Slater MD, Prakapenka VB, Balasubramanian M, Podsiadlo P, Johnson CS, Rajh T, Shevchenko EV. Hollow iron oxide nanoparticles for application in lithium ion batteries. NANO LETTERS 2012; 12:2429-35. [PMID: 22468698 DOI: 10.1021/nl3004286] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Material design in terms of their morphologies other than solid nanoparticles can lead to more advanced properties. At the example of iron oxide, we explored the electrochemical properties of hollow nanoparticles with an application as a cathode and anode. Such nanoparticles contain very high concentration of cation vacancies that can be efficiently utilized for reversible Li ion intercalation without structural change. Cycling in high voltage range results in high capacity (∼132 mAh/g at 2.5 V), 99.7% Coulombic efficiency, superior rate performance (133 mAh/g at 3000 mA/g) and excellent stability (no fading at fast rate during more than 500 cycles). Cation vacancies in hollow iron oxide nanoparticles are also found to be responsible for the enhanced capacity in the conversion reactions. We monitored in situ structural transformation of hollow iron oxide nanoparticles by synchrotron X-ray absorption and diffraction techniques that provided us clear understanding of the lithium intercalation processes during electrochemical cycling.
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105
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Shyam B, Chapman KW, Balasubramanian M, Klingler RJ, Srajer G, Chupas PJ. Structural and mechanistic revelations on an iron conversion reaction from pair distribution function analysis. Angew Chem Int Ed Engl 2012; 51:4852-5. [PMID: 22492683 DOI: 10.1002/anie.201200244] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Indexed: 11/07/2022]
Abstract
Not simply small particles: pair distribution function analysis yields comprehensive insights into the electrochemical reaction of α-Fe(2)O(3) with lithium. The metallic Fe formed in this reaction was found to be defect-rich nanoparticles that restructure continuously without growing-an unusual characteristic likely linked to its highly reversible capacity.
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106
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Németh K, Chapman KW, Balasubramanian M, Shyam B, Chupas PJ, Heald SM, Newville M, Klingler RJ, Winans RE, Almer JD, Sandi G, Srajer G. Efficient simultaneous reverse Monte Carlo modeling of pair-distribution functions and extended x-ray-absorption fine structure spectra of crystalline disordered materials. J Chem Phys 2012; 136:074105. [DOI: 10.1063/1.3684547] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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107
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Tepavcevic S, Xiong H, Stamenkovic VR, Zuo X, Balasubramanian M, Prakapenka VB, Johnson CS, Rajh T. Nanostructured bilayered vanadium oxide electrodes for rechargeable sodium-ion batteries. ACS NANO 2012; 6:530-538. [PMID: 22148185 DOI: 10.1021/nn203869a] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Tailoring nanoarchitecture of materials offers unprecedented opportunities in utilization of their functional properties. Nanostructures of vanadium oxide, synthesized by electrochemical deposition, are studied as a cathode material for rechargeable Na-ion batteries. Ex situ and in situ synchrotron characterizations revealed the presence of an electrochemically responsive bilayered structure with adjustable intralayer spacing that accommodates intercalation of Na(+) ions. Sodium intake induces organization of overall structure with appearance of both long- and short-range order, while deintercalation is accompanied with the loss of long-range order, whereas short-range order is preserved. Nanostructured electrodes achieve theoretical reversible capacity for Na(2)V(2)O(5) stochiometry of 250 mAh/g. The stability evaluation during charge-discharge cycles at room temperature revealed an efficient 3 V cathode material with superb performance: energy density of ~760 Wh/kg and power density of 1200 W/kg. These results demonstrate feasibility of development of the ambient temperature Na-ion rechargeable batteries by employment of electrodes with tailored nanoarchitectures.
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108
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Croy J, Kang SH, Balasubramanian M, Thackeray M. Li2MnO3-based composite cathodes for lithium batteries: A novel synthesis approach and new structures. Electrochem commun 2011. [DOI: 10.1016/j.elecom.2011.06.037] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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109
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Peter SC, Chondroudi M, Malliakas CD, Balasubramanian M, Kanatzidis MG. Anomalous Thermal Expansion in the Square-Net Compounds RE4TGe8 (RE = Yb, Gd; T = Cr–Ni, Ag). J Am Chem Soc 2011; 133:13840-3. [DOI: 10.1021/ja204971n] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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110
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Prasad CSRL, Sreenivasulu G, Kiran SR, Balasubramanian M, Murty BS. Electrical and magnetic properties of nanocrystalline BiFeO3 prepared by high energy ball milling and microwave sintering. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2011; 11:4097-4102. [PMID: 21780411 DOI: 10.1166/jnn.2011.3852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A new synthesis route with high energy ball milling and microwave sintering is used to obtain nanocrystalline BiFeO3 with improved dielectric and magnetic properties. Electrical and magnetic properties are compared with a conventionally sintered microcrystalline BiFeO3. It is found that the dielectric constant is increased more than one order of magnitude, electrical resistivity by six orders of magnitude and remnant polarization value is increased by 4-5 times for nanocrystalline BiFeO3 in comparison to conventionally sintered microcrystalline BiFeO3. Nanocrystalline BiFeO3 is seen to have ferromagnetic behavior whereas microcrystalline BiFeO3 is known to be antiferromagnetic.
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111
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Balasubramanian M, Smith K, Mordekar S, Parker M. Clinical report: An interstitial deletion of 16p13.11 detected by array CGH in a patient with infantile spasms. Eur J Med Genet 2011; 54:314-8. [DOI: 10.1016/j.ejmg.2011.01.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Accepted: 01/21/2011] [Indexed: 11/25/2022]
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112
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Eshed M, Pol S, Gedanken A, Balasubramanian M. Zirconium nanoparticles prepared by the reduction of zirconium oxide using the RAPET method. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2011; 2:198-203. [PMID: 21977431 PMCID: PMC3148038 DOI: 10.3762/bjnano.2.23] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2011] [Accepted: 03/17/2011] [Indexed: 05/31/2023]
Abstract
The aim of the current work is the synthesis and characterization of metallic Zr nanoparticles. The preparation is carried out by using the RAPET method (Reaction under Autogenic Pressure at Elevated Temperatures) developed in our lab. The RAPET reaction of commercial ZrO(2) with Mg powder was carried out in a closed stainless steel cell, at 750 °C. On completion of the reaction, the additionally formed MgO is removed by treatment with acid. The characterization of the product was performed by XRD, X-ray absorption spectroscopy, SEM, TEM and elemental analysis. The XRD pattern reveals that the product is composed of pure metallic zirconium, without any traces of the MgO by-product.
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113
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Balasubramanian M, Smith K, Basel-Vanagaite L, Feingold MF, Brock P, Gowans GC, Vasudevan PC, Cresswell L, Taylor EJ, Harris CJ, Friedman N, Moran R, Feret H, Zackai EH, Theisen A, Rosenfeld JA, Parker MJ. Case series: 2q33.1 microdeletion syndrome--further delineation of the phenotype. J Med Genet 2011; 48:290-8. [PMID: 21343628 DOI: 10.1136/jmg.2010.084491] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Recurrent deletions of 2q32q33 have recently been reported as a new microdeletion syndrome, clinical features of which include significant learning difficulties, growth retardation, dysmorphic features, thin and sparse hair, feeding difficulties, and cleft or high palate. Haploinsufficiency of one gene within the deleted region, SATB2, has been suggested to be responsible for most of the features of the syndrome. This article describes seven previously unreported patients with deletions at 2q33.1, all partially overlapping the previously described critical region for the 2q33.1 microdeletion syndrome. The deletions ranged in size from 35 kb to 10.4 Mb, with the smallest deletion entirely within the SATB2 gene. Patients demonstrated significant developmental delay and challenging behaviour, a particular behavioural phenotype that seems to be emerging with more reported patients with this condition. One patient in this cohort has a deletion entirely within SATB2 and has a cleft palate, whereas several patients with larger deletions have a high arched palate. In addition, one other patient has significant orthopaedic problems with ligamentous laxity. Interestingly, this patient has a deletion that lies just distal to SATB2. The orthopaedic problems have not been reported previously and are possibly an additional feature of this syndrome. Overall, this report provides further evidence that the SATB2 gene is the critical gene in this microdeletion syndrome. In addition, because the individuals in this study range in age from 3-19 years, these patients will help define the natural progression of the phenotype in patients with this microdeletion.
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114
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Fister TT, Fong DD, Eastman JA, Iddir H, Zapol P, Fuoss PH, Balasubramanian M, Gordon RA, Balasubramaniam KR, Salvador PA. Total-reflection inelastic X-ray scattering from a 10-nm thick La0.6Sr0.4CoO3 thin film. PHYSICAL REVIEW LETTERS 2011; 106:037401. [PMID: 21405295 DOI: 10.1103/physrevlett.106.037401] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Revised: 09/24/2010] [Indexed: 05/30/2023]
Abstract
To study equilibrium changes in composition, valence, and electronic structure near the surface and into the bulk, we demonstrate the use of a new approach, total-reflection inelastic x-ray scattering, as a sub-keV spectroscopy capable of depth profiling chemical changes in thin films with nanometer resolution. By comparing data acquired under total x-ray reflection and penetrating conditions, we are able to separate the O K-edge spectra from a 10 nm La0.6Sr0.4CoO3 thin film from that of the underlying SrTiO3 substrate. With a smaller wavelength probe than comparable soft x-ray absorption measurements, we also describe the ability to easily access dipole-forbidden final states, using the dramatic evolution of the La N4,5 edge with momentum transfer as an example.
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115
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Iseli AM, Kwen HD, Ul-Alam M, Balasubramanian M, Rajagopalan S. Enhanced Contaminated Human Remains Pouch: initial development and preliminary performance assessments. Am J Disaster Med 2011; 6:31-38. [PMID: 21466027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVES To produce a proof of concept prototype Enhanced Contaminated Human Remains Pouch (ECHRP) with self-decontamination capability to provide increased protection to emergency response personnel. DESIGN The key objective was to decrease the concentration of toxic chemicals through the use of an absorbent and reactive nanocellulose liner. Additionally, nanomaterials with biocidal properties were developed and tested as a "stand-alone" treatment. SETTING Private company research laboratory. PATIENTS/PARTICIPANTS Not applicable. INTERVENTIONS Not applicable. MAIN OUTCOME MEASURES Production of a functional prototype. RESULTS A functional prototype capable of mitigating the threats due to sulfur mustard, Soman, and a large variety of liquid and vapor toxic industrial chemicals was produced. Stand-alone biocidal treatment efficacy was validated. CONCLUSIONS The ECHRP provides superior protection from both chemical and biological hazards to various emergency response personnel and human remains handlers.
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116
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Kim D, Kang SH, Balasubramanian M, Johnson CS. High-energy and high-power Li-rich nickel manganese oxide electrode materials. Electrochem commun 2010. [DOI: 10.1016/j.elecom.2010.09.009] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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117
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Jin GB, Ringe E, Long GJ, Grandjean F, Sougrati MT, Choi ES, Wells DM, Balasubramanian M, Ibers JA. Structural, Electronic, and Magnetic Properties of UFeS3 and UFeSe3. Inorg Chem 2010; 49:10455-67. [PMID: 20964309 DOI: 10.1021/ic101474e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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118
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Fulton JL, Schenter GK, Baer MD, Mundy CJ, Dang LX, Balasubramanian M. Probing the Hydration Structure of Polarizable Halides: A Multiedge XAFS and Molecular Dynamics Study of the Iodide Anion. J Phys Chem B 2010; 114:12926-37. [DOI: 10.1021/jp106378p] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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119
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Fulton JL, Balasubramanian M. Structure of Hydronium (H3O+)/Chloride (Cl−) Contact Ion Pairs in Aqueous Hydrochloric Acid Solution: A Zundel-like Local Configuration. J Am Chem Soc 2010; 132:12597-604. [DOI: 10.1021/ja1014458] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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120
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Balasubramanian M, Shield JPH, Acerini CL, Walker J, Ellard S, Marchand M, Polak M, Vaxillaire M, Crolla JA, Bunyan DJ, Mackay DJG, Temple IK. Pancreatic hypoplasia presenting with neonatal diabetes mellitus in association with congenital heart defect and developmental delay. Am J Med Genet A 2010; 152A:340-6. [PMID: 20082465 DOI: 10.1002/ajmg.a.33194] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Congenital pancreatic hypoplasia is a rare cause of neonatal diabetes. We report on a series of three patients with pancreatic agenesis and congenital heart defects. All had abdominal scan evidence of pancreatic agenesis. In addition, Patient 1 had a ventricular septal defect, patent ductus arteriosus and pulmonary artery stenosis; Patient 2 had a truncus arteriosus and Patient 3 had tetralogy of Fallot. Two of the three patients have developmental delay. All three patients were isolated cases within the family. Investigations included sequencing of GCK, ABCC8, IPF1, NEUROD1, PTF1A, HNF1B, INS, ISL1, NGN3, HHEX, G6PC2, TCF7L2, SOX4, FOXP3 (Patients 1 and 2), GATA4 and KCNJ11 genes (all three patients), but no mutations were found. Genetic investigation to exclude paternal UPD 6, methylation aberrations and duplications of 6q24 was also negative in all three. 22q11 deletion was excluded in all three patients. Array CGH in Patient (1) showed a approximately 250 kb, paternally inherited duplication of chromosome 12q [arr cgh 12q24.33 (B35:CHR12:131808577-132057649++) pat], not found in the other two patients. Permanent neonatal diabetes mellitus due to pancreatic hypoplasia with congenital heart defects has been reported before and may represent a distinct condition. We discuss this rare association and review previously reported literature.
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121
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Gaucherel C, Balasubramanian M, Karunakaran PV, Ramesh BR, Muthusankar G, Hély C, Couteron P. At which scales does landscape structure influence the spatial distribution of elephants in the Western Ghats (India)? J Zool (1987) 2010. [DOI: 10.1111/j.1469-7998.2009.00652.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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122
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Jawahar P, Kanny K, Balasubramanian M. Influence of Nanoclay Addition on Properties of Unsaturated-Polyester Nanocomposite Gel Coat System. JOURNAL OF POLYMER ENGINEERING 2009. [DOI: 10.1515/polyeng.2009.29.8-9.563] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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123
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Gog T, Seidler GT, Casa DM, Upton MH, Kim J, Stoupin S, Nagle KP, Balasubramanian M, Gordon RA, Fister TT, Heald SM, Toellner T, Hill JP, Coburn DS, Kim YJ, Said AH, Alp EE, Sturhahn W, Yavas H, Burns CA, Sinn H. Momentum-resolved Resonant and Nonresonant Inelastic X-ray Scattering at the Advanced Photon Source. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/08940880903397009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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124
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Kelly SD, Bare SR, Greenlay N, Azevedo G, Balasubramanian M, Barton D, Chattopadhyay S, Fakra S, Johannessen B, Newville M, Pena J, Pokrovski GS, Proux O, Priolkar K, Ravel B, Webb SM. Comparison of EXAFS foil spectra from around the world. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/190/1/012032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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125
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Fulton JL, Kathmann SM, Schenter GK, Balasubramanian M. Hydrated Structure of Ag(I) Ion from Symmetry-Dependent, K- and L-Edge XAFS Multiple Scattering and Molecular Dynamics Simulations. J Phys Chem A 2009; 113:13976-84. [DOI: 10.1021/jp9064906] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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