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Sodium carbonate

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https://www.readbyqxmd.com/read/29220161/sequential-migrations-between-boron-and-rhodium-centers-a-cooperative-process-between-rhodium-and-a-monosubstituted-borohydride-unit
#1
Angelo Iannetelli, Graham Tizzard, Simon J Coles, Gareth R Owen
The sodium salt of a monosubstituted borohydride anion containing a 2-mercaptopyridyl unit (mp) is reported herein. This compound was coordinated to a rhodium(I) center providing the complex [Rh{κ3-H,H,S-H3B(mp)}(NBD)] (1) (where NBD = 2,5-norbornadiene) in which the boron-based ligand is coordinated to the rhodium center via the thione donor and two of the B-H bonds of the BH3 unit. Reaction of complex 1 with carbon monoxide results in the activation of the complex leading to the product of a formal intramolecular hydroboration reaction, where the NBD unit has, in effect, inserted into one of the B-H bonds...
December 8, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29220051/improving-extraction-and-post-purification-concentration-of-membrane-proteins
#2
Hasin Feroz, HyeYoung Kwon, Jing Peng, Hyeonji Oh, Bryan Ferlez, Carol S Baker, John H Golbeck, Guillermo C Bazan, Andrew L Zydney, Manish Kumar
Membrane proteins (MPs), despite being critically important drug targets for the pharmaceutical industry, are difficult to study due to challenges in obtaining high yields of functional protein. Most current extraction efforts use specialized non-ionic detergents to solubilize and stabilize MPs, with MPs being concentrated by ultrafiltration (UF). However, many detergents are retained during the UF step, which can destabilize MPs and/or interfere with their characterization. Here, we studied the influence of detergent selection on the extraction and UF-based concentration of biomedically-relevant MPs, the light-driven sodium and chloride transporters, KR2 and halorhodopsin (pHR) which are also model proteins for more complex mammalian rhodopsins...
December 8, 2017: Analyst
https://www.readbyqxmd.com/read/29215783/polymer-film-dewetting-by-water-surfactant-good-solvent-mixtures-a-mechanistic-insight-and-its-implications-for-the-conservation-of-cultural-heritage
#3
Michele Baglioni, Costanza Montis, David Chelazzi, Rodorico Giorgi, Debora Berti, Piero Baglioni
Aqueous nanostructured fluids (NSFs) have been proposed in the recent past to remove polymer coatings from the surfaces of works of art; this process usually involves film dewetting. Here we report on a major advancement in the study of NSFs cleaning mechanisms using several complementary techniques that are employed to get a mechanistic insight on the interaction of a methacrylic/acrylic copolymer (Paraloid B72®) film laid on glass surfaces and several NSFs, based on two different solvents, i.e. propylene carbonate (PC) and 2-butanone (MEK), and two different surfactants, i...
December 7, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29215111/heteronuclear-cobalt-iii-sodium-complexes-with-salen-type-compartmental-schiff-base-ligands-methylene-spacer-regulated-variation-in-nuclearity
#4
Kousik Ghosh, Klaus Harms, Antonio Bauzá, Antonio Frontera, Shouvik Chattopadhyay
Three heteronuclear cobalt(iii)/sodium Schiff base complexes have been synthesized and characterized by elemental and spectral analysis. The structures of all three complexes have been confirmed by single crystal X-ray analyses. Each of these three complexes crystallizes in monoclinic space group P21/c. In each complex, cobalt(iii) is placed in the inner N2O2 compartment and sodium is placed in the outer O2O'2 compartment (O and O' denote the phenolic and ethoxy/methoxy oxygen atoms, respectively) of the Schiff bases...
December 7, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29210425/in-situ-synthesis-of-iron-sulfide-embedded-porous-carbon-hollow-spheres-for-sodium-ion-batteries
#5
Yuanzhong Tan, Ka-Wai Wong, Zhiling Zhang, Ka Ming Ng
Iron sulfide embedded porous carbon hollow spheres (FeSx@CS) have been successfully synthesized through a facile and environment friendly in situ synthetic method. Using this method, a porous carbon matrix and uniformly dispersed iron sulfide nanoparticles were formed simultaneously and assembled into hollow spheres. The as-synthesized FeSx@CS material showed high reversible capacity, outstanding cycle performance, and excellent rate capability when it was applied as an anode material for sodium ion batteries...
December 5, 2017: Nanoscale
https://www.readbyqxmd.com/read/29207482/physico-chemical-and-electrochemical-properties-of-nanoparticulate-nio-c-composites-for-high-performance-lithium-and-sodium-ion-battery-anodes
#6
Amaia Iturrondobeitia, Aintzane Goñi, Izaskun Gil de Muro, Luis Lezama, Teófilo Rojo
Nanoparticulate NiO and NiO/C composites with different carbon proportions have been prepared for anode application in lithium and sodium ion batteries. Structural characterization demonstrated the presence of metallic Ni in the composites. Morphological study revealed that the NiO and Ni nanoparticles were well dispersed in the matrix of amorphous carbon. The electrochemical study showed that the lithium ion batteries (LIBs), containing composites with carbon, have promising electrochemical performances, delivering specific discharge capacities of 550 mAh/g after operating for 100 cycles at 1C...
December 2, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29206472/synergistic-enhancement-of-electron-accepting-and-donating-ability-of-non-conjugated-polymer-nanodot-in-micellar-environment
#7
Arpan Bhattacharya, Tushar Kanti Mukherjee
Understanding the fundamental electron transfer dynamics in photoactive carbon nanoparticles (CNPs) is utmost important for their fruitful application in photovoltaics and photocatalysis. Herein, photoinduced electron transfer (PET) to and from non-conjugated polymer nanodot (PND), a new class of luminescent CNP has been investigated in the presence of N, N-dimethylaniline (DMA) and methyl viologen (MV2+) in homogeneous methanol and sodium dodecyl sulfate (SDS) micelles. It has been observed that both, DMA and MV2+ interact with the photoexcited PND and quench the PL intensity as well as excited state lifetime in bulk methanol...
December 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29206439/redox-active-hydrogel-polymer-electrolytes-with-different-ph-values-for-enhancing-the-energy-density-of-the-hybrid-solid-state-supercapacitor
#8
Xiaohui Tang, Yu Hui Lui, Abdul Rahman Merhi, Bolin Chen, Shaowei Ding, Bowei Zhang, Shan Hu
To enhance the energy density of solid-state supercapacitors, a novel solid-state cell, made of redox-active polyvinyl alcohol (PVA) hydrogel electrolytes and functionalized carbon nanotube coated cellulose paper electrodes, was investigated in this work. Briefly, acidic PVA-[BMIM]Cl-Lactic acid-LiBr and neutral PVA-[BMIM]Cl-Sodium acetate-LiBr hydrogel polymer electrolytes are used as catholyte and anolyte, respectively. The acidic condition of the catholyte contributes to suppress the undesired irreversible reaction of 〖Br〗^-and to extend the oxygen evolution reaction potential to a higher value than the redox potential of 〖Br〗^-/〖Br〗_3^- reaction...
December 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29205591/general-one-pot-synthesis-of-transition-metal-phosphide-nitrogen-doped-carbon-hybrid-nanosheets-as-ultrastable-anodes-for-sodium-ion-batteries
#9
Genqiang Zhang
Sodium ion batteries (SIBs) have been considered as more promising energy storage devices in grid-level applications due to their largely reduced cost compared with that of lithium ion batteries. However, the practical application of SIBs has been seriously hindered because of the lacking of appropriate anode materials limited by the thermodynamics perspective, which is one of the central task to search for high performance anode candidates. Herein, we have developed a general one-pot strategy for the synthesis of transition metal phosphides (TMP) based hybrid nanosheets composed of carbon coated TMP nanoparticles anchoring on the surface nitrogen doped carbon nanosheets...
December 4, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29204930/double-layer-carbon-nanocapsules-with-radioiodine-content-and-its-interaction-with-calcium-phosphorus-and-strontium
#10
Alejandro Valderrama, Radamés Reynoso, Raúl W Gómez, Manuel Quintana, Martín Romero
First principles calculations have been performed for C60@C180 carbon double-layer endofullerenes with up to: three diatomic radioiodine molecules (131I2), two potassium radio-iodide (K131I), and three sodium radio-iodide (Na131I) inside. The plane-wave pseudopotential (PP) method within the general gradient approximation (GGA) in the framework of the density functional theory (DFT) and time-dependent DFT (TD-DFT) was used to perform geometric optimizations (GOs) and molecular dynamics (MD) at 310 K and atmospheric pressure...
December 4, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29200718/%C3%AE-glucosidase-inhibitory-activity-from-ethyl-acetate-extract-of-antidesma-bunius-l-spreng-stem-bark-containing-triterpenoids
#11
Marista Gilang Mauldina, Rani Sauriasari, Berna Elya
Background: Buni (Antidesma bunius [L.] Spreng) has been used as a traditional antidiabetic agent in Asia. Objective: The mechanism of antidiabetic properties was studied in this study by determine its α-glucosidase inhibitory activity. Method: Inhibition of α-glucosidase was performed in all fraction of Buni stem bark with acarbose and miglitol as standards. The half maximal inhibitory concentration (IC50) value of acarbose and miglitol was 5...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29200498/a-teaching-experiment-to-elucidate-a-cation-%C3%AF-effect-in-an-alkyne-cycloaddition-reaction-and-illustrate-hypothesis-driven-design-of-experiments
#12
Elijah J St Germain, Andrew S Horowitz, Dominic Rucco, Evonne M Rezler, Salvatore D Lepore
An organic chemistry experiment is described that is based on recent research to elucidate a novel cation-π interaction between tetraalkammonium cations and propargyl hydrazines. This non-bonded interaction is a key component of the mechanism of ammonium-catalyzed intramolecular cycloaddition of nitrogen to the terminal carbon of a C-C triple bond of the propargyl substrate. In this teaching experiment, reactions and control experiments are employed to demonstrate the testing of two alternative mechanistic hypotheses...
February 14, 2017: Journal of Chemical Education
https://www.readbyqxmd.com/read/29199811/hard-carbon-wrapped-na3v2-po4-3-c-porous-composite-extending-cycling-lifespan-for-sodium-ion-batteries
#13
Lei Chen, Yanming Zhao, Shenghong Liu, Long Zhao
Although the NASICON-type of Na3V2(PO4)3 is regarded as a potential cathode candidate for advanced sodium ion batteries (SIBs), it behaves undesirable rate performance and low cyclability, which are resulted from its poor electronic conductivity. Here, we utilized conductive polyaniline (PANI) grown in situ to obtain the hard carbon coated porous Na3V2(PO4)3@C composite (NVP@C@HC) with a typically simple and effective sol-gel process. Based on the restriction of double carbon layers, the NVP size decreases distinctly, which can curtail sodium ion diffusion distance and enhance the electronic conductivity...
December 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29194824/preparation-of-si-sio2-ordered-mesoporous-carbon-nanocomposite-as-an-anode-for-high-performance-lithium-ion-and-sodium-ion-batteries
#14
Mingdeng Wei, Lingxin Zeng, Renpin Liu, Lei Han, Fenqiang Luo, Xi Chen, Jianbiao Wang, Qingrong Qian, Qinghua Chen
In this work, the Si/SiO2-ordered mesoporous carbon nanocomposite (Si/SiO2-OMC) was initially fabricated through the magnesiothermic reduction strategy using two-dimensional bicontinuous mesochannel of SiO2-OMC as a precursor, combined with NaOH etching process, where crystal Si/amorphous SiO2 nanoparticles were encapsulated into OMC matrix. Such unique porous crystal Si/amorphous SiO2 nanoparticles uniformly dispersed in OMC matrix can not only mitigate the volume change of active materials during cycling process, but also improve electrical conductivity of Si/SiO2 and facilitate the Li+/Na+ diffusion...
November 30, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29189721/evaluation-of-surface-cleaning-procedures-for-ctgs-substrates-for-saw-technology-with-xps
#15
Erik Brachmann, Marietta Seifert, Steffen Oswald, Siegfried B Menzel, Thomas Gemming
A highly efficient and reproducible cleaning procedure of piezoelectric substrates is essential in surface acoustic waves (SAW) technology to fabricate high-quality SAW devices, especially for new applications such SAW sensors wherein new materials for piezoelectric substrates and interdigital transducers are used. Therefore, the development and critical evaluation of cleaning procedures for each material system that is under consideration becomes crucial. Contaminants like particles or the presence of organic/inorganic material on the substrate can dramatically influence and alter the properties of the thin film substrate composite, such as wettability, film adhesion, film texture, and so on...
November 30, 2017: Materials
https://www.readbyqxmd.com/read/29182307/a-model-study-to-assess-softwood-hemicellulose-hydrolysates-as-carbon-source-for-phb-production-in-paraburkholderia-sacchari-ipt-101
#16
Karolin Dietrich, Marie-Josée Dumont, Timothy Schwinghamer, Valerie Orsat, Luis F Del Rio
Softwood hemicellulose hydrolysates are a cheap source of sugars that can be used as a feedstock to produce polyhydroxybutyrates (PHB), which are biobased and compostable bacterial polyesters. To assess the potential of the hemicellulosic sugars as a carbon source for PHB production, synthetic media containing softwood hemicellulose sugars (glucose, mannose, galactose, xylose, arabinose) and the potentially inhibitory lignocellulose degradation products (acetic acid, 5 hydroxymethylfurfural (5-HMF), furfural and vanillin) were fermented with the model strain Paraburkholderia sacchari IPT 101...
November 28, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29177629/a-dft-study-on-graphene-sic-bn-and-aln-nanosheets-as-anodes-in-na-ion-batteries
#17
A Hosseinian, E Saedi Khosroshahi, K Nejati, E Edjlali, E Vessally
A great concern exists about the lifetime, cost, low-temperature performance, and safety of Li-ion batteries. Na-ion batteries (NIB) are an alternative to the Li-ion batteries due to the wide availability of sodium, its low cost, and nontoxicity. Here, we examined the Na and Na+ adsorption on nanosheets of carbon (graphene), AlN, BN, and SiC to explore their potential use as an anode in NIBs. The interaction of atomic Na was found to play the main role in producing different nanosheet cell voltages. Unlike the graphene and SiC nanosheets, the lone pairs on the surface of the AlN and BN nanosheets hinder the Na adsorption and significantly increase the cell voltage...
November 25, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29177297/a-flexible-sb2o3-carbon-cloth-composite-as-a-free-standing-high-performance-anode-for-sodium-ion-batteries
#18
Jei Fei, Yali Cui, Jiayin Li, Zhanwei Xu, Jun Yang, Ruiyi Wang, Yayi Cheng, Jianfeng Hang
A flexible Sb2O3/carbon cloth (CC) composite is synthesized using a simple solvothermal method. The Sb2O3/CC composite exhibits higher capacity and capacity retention of alloying and conversion reactions as an anode for sodium ion batteries, attributed to the good conductivity of CC and strong chemical bonds between Sb2O3 and CC.
November 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29173326/capillary-blood-ketone-levels-as-an-indicator-of-inadequate-breast-milk-intake-in-the-early-neonatal-period
#19
Takeshi Futatani, Ayako Shimao, Shihomi Ina, Hiroyuki Higashiyama, Shuhei Fujita, Kazuyuki Ueno, Noboru Igarashi, Kiyoshi Hatasaki
OBJECTIVE: To determine the utility of capillary blood ketone levels as an indicator of inadequate intake of breast milk in the early postnatal period. STUDY DESIGN: Levels of capillary blood beta-hydroxybutyrate (βOHB), the main ketone body in the blood, were measured with a bedside ketone meter in 585 full-term neonates aged 48-95 hours who were breastfed exclusively. Relationships between weight-loss percentage, blood sodium, glucose, pH, partial pressure of carbon dioxide, base-deficit levels, and βOHB levels were investigated...
December 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/29172142/detection-of-early-stage-prostate-cancer-by-using-a-simple-carbon-nanotube-paper-biosensor
#20
Sungkyung Ji, Myeongsoon Lee, Don Kim
This study is an investigation for an inexpensive, simple and sensitive biosensor to detect prostate cancer using bioactivated-multi wall carbon nanotubes (MWCNTs, diameter of 20nm, length of 5µm) and a micro-pore filter paper (pore size of 0.45µm). For the immunoassay of prostate specific antigen (PSA), which is a biomarker of prostate cancer, MWCNTs were activated with PSA antibody (monoclonal antibody of the prostate specific antigen) by using N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysulfosuccinimide sodium salt (NHSS)...
November 10, 2017: Biosensors & Bioelectronics
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