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https://www.readbyqxmd.com/read/28531356/spin-polarization-transfer-from-a-photogenerated-radical-ion-pair-to-a-stable-radical-controlled-by-charge-recombination
#1
Noah E Horwitz, Brian T Phelan, Jordan N Nelson, Catherine M Mauck, Matthew D Krzyaniak, Michael R Wasielewski
Photoexcitation of electron donor-acceptor molecules frequently produces radical ion pairs with well-defined initial spin-polarized states that have attracted significant interest for spintronics. Transfer of this initial spin polarization to a stable radical is predicted to depend on the rates of the radical ion pair recombination reactions, but this prediction has not been tested experimentally. In this study, a stable radical/electron donor/chromophore/electron acceptor molecule, BDPA(•)-mPD-ANI-NDI, where BDPA(•) is α,γ-bisdiphenylene-β-phenylallyl, mPD is m-phenylenediamine, ANI is 4-aminonaphthalene-1,8-dicarboximide, and NDI is naphthalene-1,4:5,8-bis(dicarboximide), was synthesized...
May 22, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28530799/bioinspired-interface-engineering-for-moisture-resistance-in-nacre-mimetic-cellulose-nanofibrils-clay-nanocomposites
#2
Kun Yao, Shu Huang, Hu Tang, Yeping Xu, Gerd Buntkowsky, Lars A Berglund, Qi Zhou
The interfacial adhesion design between "mortar" and "bricks" is essential for mechanical and barrier performance of nanocellulose-based nacre-mimetic nanocomposites, especially at high moisture conditions. To address this fundamental challenge, dopamine (DA) has been conjugated to cellulose nanofibrils (CNFs) and subsequently assembled with montmorillonite (MTM) to generate layered nanocomposite films inspired by the strong adhesion of mussel adhesive proteins to inorganic surfaces under water. The selective formation of catechol/metal ion chelation and hydrogen bonding at the interface between MTM platelets and CNFs bearing DA renders transparent films with strong mechanical properties, particularly at high humidity and in wet state...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530732/a-journey-from-calix-4-arene-to-calix-6-and-calix-8-arene-reveals-more-than-a-matter-of-size-receptor-concentration-affects-the-stability-and-stoichiometric-nature-of-the-complexes
#3
Nitin Lavande, Angel Acuña, Nuno Basílio, Vitor Francisco, Dipalee D Malkhede, Luis Garcia-Rio
The formation of inclusion complexes between lucigenin (N,N'-dimethyl-9,9'-biacridinium dinitrate) and p-sulfonatocalix[n]arenes (SCn; n = 6, 8) was investigated by fluorescence and NMR spectroscopy. Both SC6 and SC8 were found to form 1 : 1 and 1 : 2 host-guest complexes with lucigenin showing up to 10(9) M(-1) binding affinities. Strong quenching of the lucigenin fluorescence upon complexation was observed. Fluorescence regeneration after competitive binding with other potential guests present in solution was used as an indicator displacement assay to characterize the binding mechanism and affinity of alkaline metal ions (Li(+), Na(+), K(+) and Cs(+)) with SC6 and SC8...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530304/visualization-of-structural-evolution-and-phase-distribution-of-a-lithium-vanadium-oxide-li1-1v3o8-electrode-via-an-operando-and-in-situ-energy-dispersive-x-ray-diffraction-technique
#4
Qing Zhang, Andrea M Bruck, David C Bock, Jing Li, Varun Sarbada, Robert Hull, Eric A Stach, Kenneth J Takeuchi, Esther S Takeuchi, Amy C Marschilok
Li1+nV3O8 (n = 0-0.2) has been extensively investigated as a cathode material for Li ion batteries because of its superior electrochemical properties including high specific energy and good rate capability. In this paper, a synchrotron based energy dispersive X-ray diffraction (EDXRD) technique was employed to profile the phase transitions and the spatial phase distribution of a Li1.1V3O8 electrode during electrochemical (de)lithiation in situ and operando. As annealing temperature during the preparation of the Li1...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530091/3d-bioprinting-of-highly-thixotropic-alginate-methylcellulose-hydrogel-with-strong-interface-bonding
#5
Huijun Li, Yu Jun Tan, Kah Fai Leong, Lin Li
A robust alginate/methylcellulose (Alg/MC) blend hydrogel, with a strategy to improve adhesion between printed layers, has been fabricated for the first time for 3D bioprinting. The optimized Alg/MC blend hydrogel exhibits highly thixotropic property, great extrudability and stackability. With treatment by a trisodium citrate (TSC) solution, the interfacial bonding between printed layers is significantly improved. The TSC solution acts as a chelating agent to remove the superficial calcium ions at each layer...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28526866/orbital-reorientation-in-mnv2o4-observed-by-v-nmr
#6
Euna Jo, Sejun Park, Jooseop Lee, Soonchil Lee, Jeong Hyun Shim, Takehito Suzuki, Takuro Katsufuji
The simultaneous occurrence of the structural and magnetic phase transitions observed in MnV2O4 is one clear example of strong interplay among the spin, orbital and lattice degrees of freedom. The structure of MnV2O4 is switched by the magnetic field and the linear magnetostriction is very high. The orbital order mediates the interaction between the spin and the lattice generating these phenomena. In this work, we present experimental evidence of an orbital order in MnV2O4 and its reorientation under a rotating magnetic field as obtained by nuclear magnetic resonance(NMR)...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28524923/vertical-1t-mos2-nanosheets-with-expanded-interlayer-spacing-edged-on-a-graphene-frame-for-high-rate-lithium-ion-batteries
#7
Ting Xiang, Qi Fang, Hui Xie, Chuanqiang Wu, Changda Wang, Yu Zhou, Daobin Liu, Shuangming Chen, Adnan Khalil, Shi Tao, Qin Liu, Li Song
Vertical 1T-MoS2 nanosheets with an expanded interlayer spacing of 9.8 Å were successfully grown on a graphene surface via a one-step solvothermal method. Such unique hybridized structures provided strong electrical and chemical coupling between the vertical nanosheets and graphene layers by means of C-O-Mo bonding. The merits are very beneficial for a high-efficiency electron/ion transport pathway and structural stability. As a proof of concept, the lithium ion battery with the as-obtained hybrid's electrode exhibited excellent rate performance with a 666 mA h g(-1) capacity at a high current density of 3500 mA g(-1)...
May 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28524692/electron-nuclear-coupling-through-autoionizing-states-after-strong-field-excitation-of-h_-2-molecules
#8
Yonghao Mi, Nicolas Camus, Lutz Fechner, Martin Laux, Robert Moshammer, Thomas Pfeifer
Channel-selective electron emission from strong-field photoionization of H_{2} molecules is experimentally investigated by using ultrashort laser pulses and a reaction microscope. The electron momenta and energy spectra in coincidence with bound and dissociative ionization channels are compared. Surprisingly, we observed an enhancement of the photoelectron yield in the low-energy region for the bound ionization channel. By further investigation of asymmetrical electron emission using two-color laser pulses, this enhancement is understood as the population of the autoionizing states of H_{2} molecules in which vibrational energy is transferred to electronic energy...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524679/transition-from-collisional-to-collisionless-regimes-in-interpenetrating-plasma-flows-on-the-national-ignition-facility
#9
J S Ross, D P Higginson, D Ryutov, F Fiuza, R Hatarik, C M Huntington, D H Kalantar, A Link, B B Pollock, B A Remington, H G Rinderknecht, G F Swadling, D P Turnbull, S Weber, S Wilks, D H Froula, M J Rosenberg, T Morita, Y Sakawa, H Takabe, R P Drake, C Kuranz, G Gregori, J Meinecke, M C Levy, M Koenig, A Spitkovsky, R D Petrasso, C K Li, H Sio, B Lahmann, A B Zylstra, H-S Park
A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M>4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6-10 mm are irradiated with laser energies of 250 kJ per foil, generating ∼1000  km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28522242/monitoring-the-surface-quality-of-silver-plasmon-waveguides-with-nonlinear-photoemission-electron-microscopy-and-in-situ-ion-sputtering
#10
Kellie Pearce, Francis Schuknecht, Christian Späth, Benjamin Duschner, Florian Richter, Ulf Kleineberg
We use photoemission electron microscopy (PEEM) with single- and two-photon excitation to study the properties of surface plasmon polaritons (SPPs) in tapered silver stripe waveguides. Arrays of waveguides with different widths, grating coupler geometries, and taper angles are fabricated using electron beam lithography (EBL) on Si and indium-tin-oxide (ITO)-covered glass substrates. The presence of propagating SPP modes is indicated by modulations of the non-linear photoemission intensity which run along the length of the waveguide - the result of interfering SPPs reflected from the edges...
May 10, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28522166/development-and-validation-of-a-simplified-titration-method-for-monitoring-volatile-fatty-acids-in-anaerobic-digestion
#11
Hao Sun, Jianbin Guo, Shubiao Wu, Fang Liu, Renjie Dong
The volatile fatty acids (VFAs) concentration has been considered as one of the most sensitive process performance indicators in anaerobic digestion (AD) process. However, the accurate determination of VFAs concentration in AD processes normally requires advanced equipment and complex pretreatment procedures. A simplified method with fewer sample pretreatment procedures and improved accuracy is greatly needed, particularly for on-site application. This report outlines improvements to the Nordmann method, one of the most popular titrations used for VFA monitoring...
May 15, 2017: Waste Management
https://www.readbyqxmd.com/read/28517960/a-rapid-seedling-resistance-assay-identifies-wild-tomato-lines-that-are-resistant-to-pseudomonas-syringae-pv-tomato-race-1
#12
Jana A Hassan, Yan-Ming Jane Zhou, Jennifer D Lewis
Bacterial speck caused by Pseudomonas syringae has historically been controlled by the Pto/Prf gene cluster. Emerging strains like P. syringae pv. tomato (Pst) race 1 overcome resistance conferred by Pto/Prf, and can cause serious crop loss under appropriate environmental conditions. We developed a rapid assay to screen wild tomato seedlings for resistance to Pst race 1. We established the seedling resistance assay using the well-characterized Pst race 0 strain, PstDC3000, that is recognized in tomato cultivars carrying Pto/Prf (PtoR) and causes disease in isogenic lines lacking this cluster (PtoS)...
May 18, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28516780/dual-colored-carbon-dots-ratiometric-fluorescent-test-paper-based-on-a-specific-spectral-energy-transfer-for-semi-quantitative-assay-of-copper-ions
#13
Cui Liu, Dianhua Ning, Cheng Zhang, Zhengjie Liu, Ruilong Zhang, Jun Zhao, Tingting Zhao, Bianhua Liu, Zhongping Zhang
Classical pH test papers are widely employed to measure the acid-base degree of media in a qualitative and semi-quantitative way. However, the extension of the portable and inexpensive methods to a wide range of analytes so as to liberate us from the tediousness of instrumental assays remains unsuccessful. Here, we report a novel kind of dual-colored carbon dots (CDs) ratiometric-fluorescent test paper for the semi-quantitative assay of copper ions (Cu2+) by a dosage-sensitive color evolution. The creation of the test paper is based on the two interesting findings: on the one hand, the residual p-phenylenediamine (p-PDA) at the surface of as-synthesized red-emissive CDs (r-CDs) efficiently binds Cu2+ ions to produce a strong visible absorption that overlaps with the emission of blue CDs (b-CDs), on the other hand, Cu2+ ions render small b-CDs adsorbed onto the surface of larger-sized r-CDs through its dual-coordinating interactions with the surface ligands of both r-CDs and b-CDs...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28515230/crosstalk-from-camp-to-erk1-2-emerges-during-postnatal-maturation-of-nociceptive-neurons-and-is-maintained-during-aging
#14
Joerg Isensee, Cosimo Schild, Frank Schwede, Tim Hucho
Maturation of nociceptive neurons depends on changes of transcription factors, ion channels, and neuropeptides. Mature nociceptors initiate pain in part by drastically reducing the activation threshold via intracellular sensitization signaling. If sensitization signaling also changes during development and aging remains so far unknown.Using a novel automated microscopy approach, we quantified changes of intracellular signaling protein expression, of their signaling dynamics, as well as of intracellular signaling cascade wiring in sensory neurons from newborn to senescent rats...
May 17, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28514147/fragmentation-of-valence-and-core-shell-cl-2p-excited-c2cl4-molecule
#15
Antonio C F Santos, Michael Alistair MacDonald, Alexandre Braga Rocha, Narayana Perumal Appathurai, Marcelo M Sant'Anna, William Holetz, Ralph Wehlitz, Lucia Zuin
The dynamics of the photo-fragmentation pathways of tetrachloroethylene with photon energies from 15 eV up to 250 eV, encompassing the Cl 2p edge is presented. In order to distinguish the fragmentation channels, the ionic fragments were separated according to their mass to charge ratio, measured in coincidence with the photoelectrons, and collected as a function of the incident photon energy. Distinct minima or maxima are found in the partial ion yield in the region between 40 and 50 eV. These features are believed to be associated with the Cooper minimum which results from a molecular orbital with a strong atomic 3p subshell character...
May 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28513744/high-affinity-recognition-of-the-human-c-reactive-protein-independent-of-phosphocholine
#16
Jie Yang, Anna-Lena Gustavsson, Martin Haraldsson, Göran Karlsson, Thomas Norberg, Lars Baltzer
A high-affinity polypeptide conjugate 4-C25L22-DQ, has been developed for the molecular recognition of the human C-reactive protein, CRP, a well-known inflammation biomarker. CRP is one of the most frequently quantified targets in diagnostic applications and a target in drug development. With the exception of antibodies, most molecular constructs take advantage of the known affinity for CRP of phosphocholine that depends on Ca(2+) for its ability to bind. 4-C25L22-DQ which is unrelated to phosphocholine binds in the absence of Ca(2+) with a dissociation constant of 760 nM, an order of magnitude lower than that of phosphocholine, the KD of which is 5 μM...
May 17, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28513690/influence-of-the-nature-and-environment-of-manganese-in-mn-bea-zeolites-on-no-conversion-in-selective-catalytic-reduction-with-ammonia
#17
R Baran, L Valentin, J-M Krafft, T Grzybek, P Glatzel, S Dzwigaj
Manganese-containing BEA zeolites, MnxSiBEA (x = 1-4 wt%) and Mn(I.E.)AlBEA, were prepared by a two-step post-synthesis method and a conventional wet ion-exchange, respectively, and applied as catalysts in the selective catalytic reduction of NO with ammonia (NH3-SCR). The physicochemical analysis of zeolite properties by high-energy-resolution fluorescence-detected XANES (HERFD-XANES) and X-ray emission spectroscopy (XES) uncovered that the coordination, geometry and oxidation state of Mn species are strongly related to the preparation method...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28513661/a-zwitterionic-hydrocarbon-soluble-borenium-ion-based-on-a-%C3%AE-diketiminate-backbone
#18
Joseph A B Abdalla, Rémi C Tirfoin, Haoyu Niu, Simon Aldridge
A versatile synthetic route has been developed to access strongly Lewis acidic borenium cations (and heavier group 13 analogues) featuring a pendant weakly-coordinating borate function. The hydrocarbon-soluble borenium/borate zwitterion is more strongly Lewis acidic than B(C6F5)3, despite featuring a pendant (non-fluorinated) aryl group and two flanking N-donors.
May 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28513645/electrode-potential-dependent-desolvation-and-resolvation-of-germanium-100-in-contact-with-aqueous-perchlorate-electrolytes
#19
Fang Niu, Rainer Schulz, Arcesio Castañeda Medina, Rochus Schmid, Andreas Erbe
The electrode potential dependence of the hydration layer on an n-Ge(100) surface was studied by a combination of in situ and operando electrochemical attenuated total reflection infrared (ATR-IR) spectroscopy and real space density functional theory (DFT) calculations. Constant-potential DFT calculations were coupled to a modified generalised Poisson-Boltzmann ion distribution model and applied within an ab initio molecular dynamics (AIMD) scheme. As a result, potential-dependent vibrational spectra of surface species and surface water were obtained, both experimentally and by simulations...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28512293/near-infrared-quantum-cutting-luminescence-of-er-3-tm-3-ion-pairs-in-a-telluride-glass
#20
Xiaobo Chen, Song Li, Lili Hu, Kezhi Wang, Guoying Zhao, Lizhu He, Jinying Liu, Chunlei Yu, Jingfu Tao, Wei Lin, Guojian Yang, Gregory J Salamo
The multiphoton near-infrared, quantum cutting luminescence in Er(3+)/Tm(3+) co-doped telluride glass was studied. We found that the near-infrared 1800-nm luminescence intensity of (A) Er(3+)(8%)Tm(3+)(0.5%):telluride glass was approximately 4.4 to 19.5 times larger than that of (B) Tm(3+)(0.5%):telluride glass, and approximately 5.0 times larger than that of (C) Er(3+)(0.5%):telluride glass. Additionally, the infrared excitation spectra of the 1800 nm luminescence, as well as the visible excitation spectra of the 522 nm and 652 nm luminescence, of (A) Er(3+)(8%)Tm(3+)(0...
May 16, 2017: Scientific Reports
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