Gotowa bibliografia na temat „Precipitation de ZHS”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Spis treści
Zobacz listy aktualnych artykułów, książek, rozpraw, streszczeń i innych źródeł naukowych na temat „Precipitation de ZHS”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Artykuły w czasopismach na temat "Precipitation de ZHS"
1
Na, Moony, i Hye Ryung Byon. "Stabilizing Metallic Zn Electrode Using Organic Acid Additives in Aqueous Zinc-Ion Batteries". ECS Meeting Abstracts MA2022-01, nr 1 (7.07.2022): 20. http://dx.doi.org/10.1149/ma2022-01120mtgabs.
Pełny tekst źródłaStreszczenie:
Aqueous zinc (Zn)-ion batteries (AZIBs) have been paid attention to as safe, economical, and high-energy-density storages through multiple electron transfer. Although conventional alkaline solution-based AZIBs are primary batteries, recent studies demonstrated the reversible Zn2+ deposition and stripping processes enabled in mildly acidic solutions. It promises the development of rechargeable AZIBs and viable applications for energy storage systems (ESSs). However, metallic Zn employed as the negative electrode has suffered from severe corrosion and precipitation of electrolyte salts in this low pH condition. The Zn electrode undergoes a hydrogen evolution reaction (HER) as Zn2+ is dissolved from the Zn surface. The corrosion leads to a pH rise, precipitating electrolyte salt as zinc hydroxide forms. For example, hexagonal plates of zinc hydroxide sulfate hydrate (Zn4SO4(OH)6∙xH2O, indicated as ZHS) grew on the Zn electrode in 1 M ZnSO4 solution when pH approached ~5.4. The insulating and randomly oriented ZHS increased the surface resistance and caused the non-uniform Zn deposition. These challenges are mitigated by adding organic acid to the 1 M ZnSO4 solution. As the HER raised pH, the acid was promptly deprotonated, then coordinated with Zn2+. This process caused the thin film formation consisting of three-dimensional zinc glutarate. The zinc glutarate protected the Zn electrode and impeded the electrode corrosion and the ZHS precipitation. We demonstrated a uniform Zn plating and stripping process with 10 mM of organic acid in contrast with dendritic and dead Zn growth in the absence of the additive. Galvanostatic tests of symmetric Zn cells revealed over 1000 h cycles with the additives at a current density of 1 mA cm-2 and a limited capacity of 1 mAh cm-2. In contrast, the Zn cells with the additive-free electrolyte solution exhibited 15 times lower cyclability as micron-scale ZHS plates covered the electrode surface. Our strategy using the cheap additives is feasible to use grid-scale ESSs and shows significantly improved cycling performances. I will present details of Zn surface reactions using organic acid additive and corresponding electrochemical performances in this presentation.
2
Xu, Jian Zhong, Ke Hu i Ji Xing Xie. "The Effect of Organic Compounds on the Crystal Structure of Zinc Hydroxystannate". Advanced Materials Research 197-198 (luty 2011): 273–76. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.273.
Pełny tekst źródłaStreszczenie:
The polyhedral crystals, octahedral crystals and cube crystals of Zinc hydroxystannate (ZHS) were prepared by the homogeneous precipitation synthesis method. The organic compounds, PEG-400, β-cyclodextrin (β-CD) and L-alanine were added in the reaction systems to control the crystal structure. The crystal structure and morphology of products were characterized by SEM and XRD. The crystal structure of all products could be attributed to the cubic ZnSn(OH)6 by the XRD analysis. The SEM pictures of the products were different with the change of organic compounds. The FTIR spectrum indicated the ZHS without organic residual and the possible formation mechanism was discussed.
3
Liu, Cheng, Wenhai Wang, Ashley Black Serra, Vlad Martin Diaconescu, Lorenzo Stievano, Laura Simonelli i Dino Tonti. "Tracking Mn and Zn in Rechargeable Aqueous Zn-MnO2 Batteries By Operando X-Ray Absorption". ECS Meeting Abstracts MA2023-02, nr 55 (22.12.2023): 2705. http://dx.doi.org/10.1149/ma2023-02552705mtgabs.
Pełny tekst źródłaStreszczenie:
Zn-MnO2 batteries with mildly acidic electrolytes are a promising chemistry for large scale storage thanks to their remarkable energy density, low cost, and high safety. This is mainly obtained thanks to the high capacity of the Zn metal anode, and the nonflammable character of the aqueous electrolyte. MnO2 is one of the most common cathode of choice, not only for being Earth-abundant, but also because it can undergo a two-electron mechanism, which is however complex and still not fully understood. There is currently agreement in considering for discharge a MnO2 dissolution, leading to soluble Mn2+ and simultaneous precipitation of Zinc Hydroxide Sulfate (ZHS, ZnSO4[Zn(OH2)]3·xH2O). When charging the process is not simply reverted. In fact, a distinct electrochemical profile is observed, with at least two distinct plateaus and a third, apparently pseudocapacitive stage (Figure 1a). A similar multistage profile is observed during the second discharge. Although such profile is characteristic and observed with different MnO2 phases and architectures, the underlying mechanism remains elusive, as it seems to involve mainly poorly crystallized phases. We studied the mechanism by operando X-ray absorption (XAS) at the Mn and Zn K-edges to follow speciation simultaneously and quantitatively in the cathode and in the electrolyte via principal component analysis. Beam intensity needed appropriate regulation to avoid interference with the experiment. Simultaneous X-ray diffraction allowed precise correlation with the MnO2 dissolution and ZHS formation. We found evidence of Mn(III) intermediate occurring during local bond reorganization, which is inferred by the significant evolution of the absorption fine structure region (EXAFS) of the Mn K-edge (Figure 1b). In contrast, minor Zn spectral changes reflect primarily processes of precipitation and dissolution, suggesting that no Zn-Mn mixed phases form during cycling. Figure 1
4
Marschilok, Amy C., Esther S. Takeuchi i Kenneth J. Takeuchi. "(Invited) Zinc/ Sodium Vanadium Oxide (NaV3O8) Aqueous Electrolyte Batteries: Competing Proton and Zinc Ion Insertion". ECS Meeting Abstracts MA2023-01, nr 5 (28.08.2023): 920. http://dx.doi.org/10.1149/ma2023-015920mtgabs.
Pełny tekst źródłaStreszczenie:
Large-scale energy storage systems suitable for pairing with renewable energy generation require low-cost materials and safety. A promising candidate for large scale storage is the aqueous Zn-ion battery (AZIB). Zinc metal is a useful anode for aqueous batteries as it possesses a high theoretical capacity (820 mAh/g), low redox potential (-0.76 V vs SHE), and allows for two electron transfers per Zn2+ (de)insertion. Sodium vanadium oxides have been investigated as cathode materials for AZIBs as the size of Na+ is larger than Zn2+ facilitating ion diffusion within the lattice. Specifically, sodium vanadium oxide (NaV3O8, NVO) in an anhydrous form and its monohydrate (NaV3O8·H2O) have been identified as candidate materials. Notably, one of the phases that forms during the discharge of these materials within a zinc battery system is zinc hydroxy-sulfate (Zn4(SO4)(OH)6·5H2O (ZHS) and has been attributed to H+ insertion in NVO where the H+ insertion is accompanied by local pH change and precipitation of the ZHS. This presentation probes the competing zinc ion and proton insertion mechanisms for discharge of NVO. The impact of (dis)charge rate on reduction products formed is determined with quantitative Rietveld refinement analysis. Further, synchrotron based EDXRD providing spatio-temporally resolved data is used to determine phase evolution operando in different locations within thick porous NVO positive electrodes. Determining the reaction progression within thick electrodes while under load is an important aspect of scaling batteries appropriately, where these results can have relevance to development of future sustainable energy storage systems.
5
Gou, Yabin, Haonan Chen, Hong Zhu i Lulin Xue. "Microphysical processes of super typhoon Lekima (2019) and their impacts on polarimetric radar remote sensing of precipitation". Atmospheric Chemistry and Physics 23, nr 4 (22.02.2023): 2439–63. http://dx.doi.org/10.5194/acp-23-2439-2023.
Pełny tekst źródłaStreszczenie:
Abstract. The complex precipitation microphysics associated with super typhoon Lekima (2019) and its potential impacts on the consistency of multi-source datasets and radar quantitative precipitation estimation were disentangled using a suite of in situ and remote sensing observations around the waterlogged area in the groove windward slope (GWS) of Yandang Mountain (YDM) and Kuocang Mountain, China. The main findings include the following: (i) the quality control processing for radar and disdrometers, which collect raindrop size distribution (DSD) data, effectively enhances the self-consistency between radar measurements, such as radar reflectivity (ZH), differential reflectivity (ZDR), and the specific differential phase (KDP), as well as the consistency between radar, disdrometers, and gauges. (ii) The microphysical processes, in which breakup overwhelms coalescence in the coalescence–breakup balance of precipitation particles, noticeably make radar measurements prone to be breakup-dominated in radar volume gates, which accounts for the phenomenon where the high number concentration rather than the large size of drops contributes more to a given attenuation-corrected ZH (ZHC) and the significant deviation of attenuation-corrected ZDR (ZDRC) from its expected values (Z^DR) estimated by DSD-simulated ZDR–ZH relationships. (iii) The twin-parameter radar rainfall estimates based on measured ZH (ZHM) and ZDR (ZDRM), and their corrected counterparts ZHC and ZDRC, i.e., R(ZHM, ZDRM) and R(ZHC, ZDRC), both tend to overestimate rainfall around the GWS of YDM, mainly ascribed to the unique microphysical process in which the breakup-dominated small-sized drops above transition to the coalescence-dominated large-sized drops falling near the surface. (iv) The improved performance of R(ZHC, Z^DR) is attributed to the utilization of Z^DR, which equals physically converting breakup-dominated measurements in radar volume gates to their coalescence-dominated counterparts, and this also benefits from the better self-consistency between ZHC, Z^DR, and KDP, as well as their consistency with the surface counterparts.
6
Van Den Broeke, Matthew S., Dana M. Tobin i Matthew R. Kumjian. "Polarimetric Radar Observations of Precipitation Type and Rate from the 2–3 March 2014 Winter Storm in Oklahoma and Arkansas". Weather and Forecasting 31, nr 4 (7.07.2016): 1179–96. http://dx.doi.org/10.1175/waf-d-16-0011.1.
Pełny tekst źródłaStreszczenie:
Abstract A powerful winter storm affected the south-central United States in early March 2014, accompanied by elevated convective cells with hail and high rates of sleet, freezing rain, and snow. During portions of the event the thermal profile exhibited a shallow surface cold layer and warm, unstable air aloft. Precipitation falling into the cold layer refroze into ice pellets and was accompanied by a polarimetric refreezing signature and numerous crowdsourced surface ice pellet reports. Quasi-vertical profiles of the polarimetric variables indicated an enhanced reflectivity factor ZHH below the melting layer bright band and enhanced low-level differential reflectivity ZDR values coincident with surface ice pellet reports. Freezing rain rate was highest in areas with high ZHH and specific differential phase KDP values at low levels. High snow rates were most closely associated with 1- and 1.5-km ZHH values, though KDP and ZDR also appeared to show some ability to distinguish high snow rate. Numerous elevated convective cells contained rotating updrafts that appeared to contribute to storm longevity and intensity. Most contained well-defined ZDR maxima or columns and relatively high base-scan ZDR values. Several contained polarimetric signatures consistent with heavy mixed-phase precipitation and hail; social media reports indicated that large hail was produced by some of the storms.
7
Steinert, J., i M. Chandra. "Cloud physical properties and empirical polarimetric measurements of rain signatures at C-Band". Advances in Radio Science 6 (27.05.2008): 315–18. http://dx.doi.org/10.5194/ars-6-315-2008.
Pełny tekst źródłaStreszczenie:
Abstract. Raindrops are one type of precipitation in stratiform and convective clouds. To get relationships for describing the raindrops two different methods were used. In the first way, the microphysical properties of the liquid hydrometeors were examined. For this the use of the Rayleigh approximation for small particles (raindrops at C-Band) and the drop size distribution by Ulbrich (Γ-DSD) lead to the calculation of the reflectivity at horizontal polarisation ZHH, the reflectivity at vertical polarisation ZVV and the differential reflectivity ZDR. In the second way, rain signatures were separated from polarimetric measurements. The database of these measurements consists of datasets measured by the dual polarimetric C-Band weather radar POLDIRAD (DLR, Oberpfaffenhofen). The aim of this study was then to combine and to compare the results from the real radar measurements against the theoretical calculations in the ZHH-ZDR plane. Based on these observations and calculations, scientific results for future practical use will be presented in form of empirical equations including ZHH-ZDR. Finally in form of scientific discussion, the ZHH-ZDR plane will be critically assessed for outstanding problems or issues.
8
Afzal, Amina, Nadeem Iqbal i Muhammad Rafique. "Ferrite-SCNTs Composite (ZFS) Embedded Nanostructured Cellulose Acetate Membranes - A Promising Sulphate Salts Rejecting Tool. Synthesis and Characterizations". Journal of Nano Research 80 (5.09.2023): 21–36. http://dx.doi.org/10.4028/p-wrtd3s.
Pełny tekst źródłaStreszczenie:
Tailoring diverse characteristics of nanostructured cellulose acetate (CA) membranes by incorporating nanocomposite-tubes ZFS composed of zinc ferrites decorated over single walled carbon nanotubes (SCNTs) for desalination application, is presented in the current research. In situ coprecipitated route is adopted to synthesize ZFS composite filler that imparts morphological, structural, and thermal modifications in CA membranes. Phase inversion via immersion precipitation route has been adopted to synthesis mixed matrix membranes. Microstructural analysis divulges pore size tuning from 1µm to 5nm by increasing loading content of infused filler (ZFS) from 0 to 4wt.%. XRD and FTIR examinations verified the existence and linkages of impregnated composite nanotubes in the modified membranes. Increasing ZFS contents 1-4wt.% enhanced the thermal stability of host membranes up to 17°C in comparison to pristine CA membranes as proclaimed by thermal degrative investigations. Membranes’ performance is evaluated by deionized water flux and sulphate salts (aluminum and copper) rejection capabilities. The prepared membranes are highly effective in salts removal application as evident from 98% of aluminum sulphate rejection that emanates from micro to nano porosity transformation after increasing filler composite into the membrane matrices.
9
Chang, Wei-Yu, Jothiram Vivekanandan, Kyoko Ikeda i Pay-Liam Lin. "Quantitative Precipitation Estimation of the Epic 2013 Colorado Flood Event: Polarization Radar-Based Variational Scheme". Journal of Applied Meteorology and Climatology 55, nr 7 (lipiec 2016): 1477–95. http://dx.doi.org/10.1175/jamc-d-15-0222.1.
Pełny tekst źródłaStreszczenie:
AbstractThe accuracy of rain-rate estimation using polarimetric radar measurements has been improved as a result of better characterization of radar measurement quality and rain microphysics. In the literature, a variety of power-law relations between polarimetric radar measurements and rain rate are described because of the dynamic or varying nature of rain microphysics. A variational technique that concurrently takes into account radar observational error and dynamically varying rain microphysics is proposed in this study. Rain-rate estimation using the variational algorithm that uses event-based observational error and background rain climatological values is evaluated using observing system simulation experiments (OSSE), and its performance is demonstrated in the case of an epic Colorado flood event. The rain event occurred between 11 and 12 September 2013. The results from OSSE show that the variational algorithm with event-based observational error consistently estimates more accurate rain rate than does the “R(ZHH, ZDR)” power-law algorithm. On the contrary, the usage of ad hoc or improper observational error degrades the performance of the variational method. Furthermore, the variational algorithm is less sensitive to the observational error of differential reflectivity ZDR than is the R(ZHH, ZDR) algorithm. The variational quantitative precipitation estimation (QPE) retrieved more accurate rainfall estimation than did the power-law dual-polarization QPE in this particular event, despite the fact that both algorithms used the same dual-polarization radar measurements from the Next Generation Weather Radar (NEXRAD).
10
Van Den Broeke, Matthew S., Jerry M. Straka i Erik N. Rasmussen. "Polarimetric Radar Observations at Low Levels during Tornado Life Cycles in a Small Sample of Classic Southern Plains Supercells*". Journal of Applied Meteorology and Climatology 47, nr 4 (1.04.2008): 1232–47. http://dx.doi.org/10.1175/2007jamc1714.1.
Pełny tekst źródłaStreszczenie:
Abstract Preliminary schematics of polarimetric signatures at low levels in southern plains classic supercells are developed for pretornado, tornado, and tornado demise times from a small collection of cases, most of which are cyclic tornado producers. Characteristic signatures and patterns are identified for the reflectivity factor (ZHH), the differential reflectivity (ZDR), the correlation coefficient (ρhv), and the specific differential phase (KDP). Signatures likely related to an ongoing tornado are also discussed. Major findings in ZHH at tornado times include “wings” of higher values often extending away from the updraft region, a stronger gradient on the west side of the echo appendage, and a local maximum at the storm location favorable for tornadogenesis. Increasing cyclonic curvature of the hook-echo region was noted through the tornado life cycle. The ZDR tended to indicate hail shafts most commonly at tornado times, with the highest storm values typically located along the storm’s forward flank throughout the tornado life cycle. A ZDR minimum often occurred at the tornado-favorable location, while low ZDR occasionally trailed the tornado region. Storm-minimum ρhv typically occurred at the tornado-favorable location at tornado times and in hail shafts or heavy rain areas at other times. Another region of low correlation was the storm updraft, while the highest storm correlation was typically found in the downwind light-precipitation shield. The KDP typically exhibited a storm-core temporal maximum at tornado times, with the highest storm values in regions of hail and heavy rain and the lowest values in the downwind light-precipitation region. Values in the tornado-favorable region were typically near zero and sometimes strongly negative.
Rozprawy doktorskie na temat "Precipitation de ZHS"
1
Aguilar, Ivette. "Batteries aqueuses Zn-MnO2 : études mécanistiques et pistes de développement pour des dispositifs réversibles à haute énergie". Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS506.
Pełny tekst źródłaStreszczenie:
Les batteries Li-ion occupent une place prédominante sur le marché de l'électronique portable en raison de leur densité d'énergie élevée et de leur durée de vie importante. Cependant, leur durabilité doit encore être améliorée. Dans cette optique, on constate un intérêt croissant pour les batteries aqueuses. Des efforts considérables sont par exemple déployés pour rendre rechargeables les piles alcalines Zn-MnO2. Cela s'avère être une tâche colossale en raison de la complexité de la chimie du système Zn-MnO2 qui, malgré plusieurs décennies de recherches, n'est pas encore entièrement rationalisée, entrainant un retard dans son déploiement pratique. Dans ce travail, nous réétudierons ces dispositifs par des techniques analytiques telles que la microscopie électronique en transmission, la spectroscopie Raman, la microbalance à quartz et la réflectométrie optique, tout en considérant des aspects fondamentaux de la chimie des solutions. Par l'assemblage de cellules avec différentes compositions d’électrode positive, nous confirmons le rôle clé de l'électrolyte ainsi que le lien indissociable entre son pH et la réponse électrochimique du système. De plus, au cours de la décharge et de la charge, nous fournissons des preuves expérimentales de la formation d'hydroxydes de zinc solubles près de l’interface cathode-électrolyte, responsables de la précipitation chimique de la phase Zn4SO4(OH)6.xH2O. Nous montrons également l’importance de ces équilibres pour le fonctionnement du système. Inspiré des travaux présentés par Yamamoto en 1986, nous avons également mené un travail d’optimisation qui nous a permis de développer des cellules avec une capacité gravimétrique importante et une rétention de capacité élevée. L’ensemble de conclusions présentées fournissent de nouvelles perspectives pour le développement de batteries aqueuses rechargeables à faible coût et à haute performanceLi-ion batteries are prominent in the portable electronics market due to their high energy density and long lifetime. However, their durability still needs to be improved. In this respect, there is a growing interest in aqueous batteries. For example, considerable efforts are being devoted to make alkaline Zn-MnO2 batteries rechargeable. This is proving to be a daunting task due to the complex chemistry of the Zn-MnO2 system, which, despite decades of research, is not yet fully rationalised, resulting in a delay in its practical deployment. In this work, we will re-examine these devices by analytical techniques such as transmission electron microscopy, Raman spectroscopy, quartz crystal microbalance and optical reflectometry, while considering fundamental aspects of solution chemistry. By assembling cells with different positive electrode compositions, we confirm the key role of the electrolyte and the inseparable link between its pH and the electrochemical response of the system. Furthermore, during discharge and charge, we provide experimental evidence for the formation of soluble zinc hydroxides near the cathode-electrolyte interface, responsible for the chemical precipitation of the Zn4(OH)6 SO4.xH2O phase. We also show the importance of these equilibria for the functioning of the system. Inspired by the work presented by Yamamoto in 1986, we also carried out an optimisation study that allowed us to develop cells with high gravimetric capacity and high capacity retention. The set of findings presented provide new perspectives for the development of low cost, high performance rechargeable aqueous batteries
2
Huang, Giong-Jun, i 黃瓊君. "The preparation of photoluminescence of ZnS phosphor by H2S precipitation method". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/hfz68b.
Pełny tekst źródłaStreszczenie:
碩士國立臺北科技大學
材料科學與工程研究所
95
This study uses the H2S precipitation method to prepare ZnS under the room temperature, and the solid state method to dope the rare-earth ion Tb, as its activator. Then the phosphors are fired to higher than 1250℃ under protective atmosphere environment. Finally, grind the powder to 20~30um. Experimental result learn XRD and PL spectral analysis using H2S precipitation method to prepare ZnS powder. Its productivity of ZnS relatively good, but crystallization , grains of shape and luminous intensity relatively bad under pH =9. Its shape, crystallization and luminous intensity are all better, the shortcoming lies in the producing rate is unable to improve under pH =3. According to luminescence spectra, we know that ZnS:Tb(Tb:KF=1:3) phosphors which were prepared by the H2S precipitation method under pH=3 could obtain the strongest luminous intensity and get the strongest absorption peak at 347nm. The emission spectrum excited by 347nm wavelength, they showed green light wavelength range which corresponded to 5D4→7F6, 5D4→7F5, 5D4→7F4 and 5D4→7F3 transitions, respectively. Although the luminous intensity of the phosphors which prepared by H2S precipitation is lower than the luminous intensity of that prepared by TAA precipitation, we use the way that adding the rare element Ce to our phosphors in order to promoting the luminous intensity of phosphors. . According to the results, we could obtain the strongest luminous intensity when the molar fraction of Ce was reach 0.15mole%.
Książki na temat "Precipitation de ZHS"
1
Qingzang Gaoyuan dong bei bian po qiang jiang shui lun wen ji: Ji nian Zhouqu te da shan hong ni shi liu di zhi zai hai yi zhou nian = Qingzang Gaoyuan Dongbei Bianpo Qiangjiangshui Lunwenji = Qingzanggaoyuan Dong bei Bianpo Qiangjiangshui Lunwenji. Beijing Shi: Qi xiang chu ban she, 2012.
Znajdź pełny tekst źródłaCzęści książek na temat "Precipitation de ZHS"
1
Pandey, Nitin, Rajneesh Kumar Srivastava i S. G. Prakash. "Study of Photocurrent and Dark Current in ZnS Nano Particles Prepared by Precipitation Method". W Springer Proceedings in Physics, 125–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34216-5_12.
Pełny tekst źródła
2
Taber, Douglass F. "Progress in Alkene and Alkyne Metathesis: (+)-5- epi -Citreoviral(Funk) and ( ± )-Poitediol (Vanderwal)". W Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0032.
Pełny tekst źródłaStreszczenie:
The Fischer carbene 2 at 0.5 mol % gives only 12% conversion of 1 to 4 after 18 hours. Debra J. Wallace of Merck Process showed (Adv. Synth. Cat. 2009, 351, 2277) that addition of a catalytic amount of the inexpensive 3 activated 2 , leading to 95% conversion of 1 to 4 after 18 hours. Shazia Zaman of the University of Canterbury and Andrew D. Abell of the University of Adelaide found (Tetrahedron Lett. 2009, 50, 5340) that the catalyst 5, incorporating a polyethylene glycol (PEG) chain, was readily recovered in active form by precipitation and could be reused at least fi ve times. Zhu Yinghuai of the Institute of Chemical and Engineering Sciences, Singapore (Adv. Synth. Cat. 2009, 351, 2650), and Chao Che, Zhen Yang, and Biwang Jiang of Peking University (Chem. Commun. 2009, 5990) independently described the preparation of Ru complexes such as 5 bound to magnetic nanoparticles. The catalysts were easily recycled and reused, leaving < 4 ppm Ru in the product. Reto Dorta of the University of Zurich reported (J. Am. Chem. Soc. 2009, 131, 9498) that the complex 6 (Ar = 2,7-diisopropylnaphthyl) was a separable mixture of syn- and anti-isomers. The very reactive anti-isomer at 50 ppm converted neat 1 into 2 in 2 hours at room temperature. Richard R. Schrock of MIT devised (J. Am. Chem. Soc. 2009, 131, 10840) an efficient Mo catalyst for a long-sought transformation—the ethenolysis of long-chain alkenes such as 7. Robert A. Stockman of the University of Nottingham developed (Chem. Commun. 2009, 4399) a related Ru-catalyzed procedure: cross-metathesis ring opening with methyl acrylate 11. Amir A. Hoveyda of Boston College, a coauthor on the Schrock paper, used (J. Am. Chem. Soc. 2009, 131, 10652) a very similar Mo catalyst for the rapid cross-metathesis of an alkyne with ethene, leading after subsequent ring-closing metathesis to products such as 14. Alois Fürstner of the Max-Planck-Institut, Mülheim, described (J. Am. Chem. Soc. 2009, 131, 9468) a well-characterized Mo nitride complex that efficiently catalyzed the conversion of 15 into 16. Samir Bouzbouz of the Université de Rouen and Janine Cossy of ESPCI ParisTech established (Organic Lett. 2009, 11, 5446) conditions for the metathesis of alkenes with the linchpin 18.
Streszczenia konferencji na temat "Precipitation de ZHS"
1
Deshpande, M. P., Kamakshi Patel, Vivek P. Gujarati i S. H. Chaki. "Photoluminescence study of Mn doped ZnS nanoparticles prepared by co-precipitation method". W INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946457.
Pełny tekst źródła
2
Rani, Geeta, P. D. Sahare, S. K. Tripathi, Keya Dharamvir, Ranjan Kumar i G. S. S. Saini. "Synthesis and Luminescent Properties of Li-doped ZnS Nanostructures by Chemical Precipitation Method". W INTERNATIONAL CONFERENCE ON ADVANCES IN CONDENSED AND NANO MATERIALS (ICACNM-2011). AIP, 2011. http://dx.doi.org/10.1063/1.3653705.
Pełny tekst źródła
3
Hassan, Tunis Balasim, i Shaymaa M. Salih. "Affect various capping agents on structural and optical properties of ZnS nanoparticles by co-precipitation method". W TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES21Gr. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0093188.
Pełny tekst źródłaRaporty organizacyjne na temat "Precipitation de ZHS"
1
Dunn, B., i A. J. Ardell. Precipitation Hardening of Infrared Transmitting ZnS Ceramics. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 1993. http://dx.doi.org/10.21236/ada265184.
Pełny tekst źródła