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39 results for “surface chemistry”
PIE LTER diel surface water chemistry of two high marsh ponds, Rowley, MA, during the summer of 2016.
We measured diel fluctuations in surface water chemistry of two high marsh ponds in July 2016. The ponds are shallow and experience day-night swings in oxygen concentrations, from super-saturation to anoxia. Our goal was to characterize changes in geochemical properties and dissolved organic carbon concentrations that accompany wide swings in oxygen concentrations. These data provide information about the responsiveness of microbial communities and how the dominance of redox-sensitive metabolisms changes over short time scales (e.g., hours) to feed back on pond water chemistry.
h-BN in the making: The surface chemistry of borazine on Rh(111)
<p>Herein, we present the raw data and the evaluated files (including a corresponding data assignment) affiliated with the research article "h-BN in the making: The surface chemistry of borazine on Rh(111)", accepted for publication in The Journal of Chemical Physics.</p>
Surface Coordination Chemistry of Graphitic Carbon Nitride from Ag Molecular Probes
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Adirondack Lakes Survey (NY): summer surface chemistry datat, 1984-1987
Reported water chemistry data are from the intensive lake chemistry survey conducted between the months of July and August from 1984 – 1987 as part of the larger Adirondack lakes survey of chemistry and fish. This intensive sampling took place in the summer when most Adirondack waters are typically stratified. When possible, the middle or deepest part of the lake was sampled to avoid the effects of littoral zones and inlet streams. Samples in isothermal waters were collected 1.5 meters below the surface or at mid-depth when the waters were less than 1.5 meters deep. In stratified waters, a sample was collected at 1.5 meters below the surface and also half way between the thermocline and the bottom. Chemical analysis was conducted at the Adirondack Lakes Survey Corporation (ALSC) laboratory in Ray Brook following EPA guidelines.
Surface water chemistry:Scale Dependent Nutrient Interactions among Lacustrine Communities
E280 is a long-term study, initiated in 2013, to determine how nutrient retention vs. export in the uplands affects downslope aquatic communities. Experimental work will focus on stoichiometry and patterns of nutrient limitation at different observational scales. Our proposed work will test the hypothesis that with increasing spatial and temporal scale, interactions among limiting nutrients diminish and single factor limitation is increasingly prevalent.
Surface chemistry dictates the enhancement of luminescence and stability of InP QDs upon c-ALD ZnO hybrid shell growth
<p>Indium phosphide quantum dots (InP QDs) are a promising example of RoHS (Restriction of Hazardous Substances) compliant light-emitting materials. However, they suffer from low quantum yield and instability upon processing under ambient conditions. Colloidal atomic layer deposition (c-ALD) has been recently proposed as a methodology to grow hybrid materials including QDs and organic/inorganic oxide shells, which possess new functions compared to the as-synthesized QDs. Here, we demonstrate that ZnO shells can be grown on InP QDs obtained via two synthetic routes, which are the classical sylilphosphine-based and the more recently developed aminophosphine-based one. We find that the ZnO shell increases the photoluminescence emission significantly only in the case of aminophosphine-based InP QDs. We rationalize this result with the different chemistry involved in the nucleation step of the shell and the resulting surface defect passivation. Furthermore, we demonstrate that the ZnO shell prevents degradation of the InP QD suspension under ambient conditions by avoiding moisture induced ligand displacement from their surface. Overall, this study proposes c-ALD as a methodology for the synthesis of alternative InP-based core@shell QDs and provides insight into the surface chemistry that results in both enhanced photoluminescence and stability required for application in optoelectronic devise and bio-imaging.</p> <p> </p>
Mapping out the aqueous surface chemistry of metal oxide nanocrystals; carboxylate, phosphonate and catecholate ligands
<p>Data underlying the figures in the publication “Mapping out the aqueous surface chemistry of metal oxide nanocrystals; carboxylate, phosphonate and catecholate ligands”, published in JACS Au.</p> <p> </p> <p>Table of contents:</p> <p>The <em>.pxp</em> documents contain the experimental data of the figures in the manuscript and it can be opened/edited with the software IGOR Pro 8.0 or higher.</p> <p><strong>1. Figure 1.pxp</strong>: Experimental data for <em>Figure 1</em>. (A) Solvothermal synthesis of HfO<sub>2</sub> nanocrystals starting from 1 equivalent Hf(O-tBu)<sub>4</sub> and 80 equivalents benzyl alcohol. (B) <sup>1</sup>H NMR spectra (normal or diffusion filtered) of MEEAA functionalized HfO<sub>2</sub> NCs in different solvents. The α and β resonances belong to the residual hydroxyl and methyl groups of methanol, respectively. (C) Transmission Electron Microscopy (TEM) image of the synthesized HfO<sub>2</sub> NCs. The NC diameter of the quasi-spherical NCs was calculated after measuring the surface area of at least 150 NCs and calculated the diameter as if it was a circle. A size distribution histogram and a zoomed-in image of a singular NC can be seen respectively in the bottom left and the top right corner.</p> <p><strong>2. Figure 2.pxp</strong>: Experimental data for <em>Figure 2</em>. (A) Ligand exchange performed between MEEAA functionalized NCs and PA-PEG. (B) <sup>1</sup>H NMR reference spectra in MeOD of the free ligands as reference and the stepwise titration of MEEAA functionalized NCs with PA-PEG, equivalents are with respect to the total amount of MEEAA present. (C) <sup>31</sup>P NMR spectra (4096 scans) in MeOD for the stepwise titration of MEEAA functionalized NCs with PA-PEG, broadened signals are indicative of NC binding. (D) Diffusion filtered <sup>1</sup>H NMR spectra of MEEAA functionalized NCs in MeOD after addition of 1.3 equivalents of PA-PEG. Signals arising from bound MEEAA are denoted in red, signals arising from PA-PEG are denoted in striped blue. CNC = 1210 µmol.L<sup>-1</sup>, corresponding to 34 mg NCs of this size in 0.5 ml MeOD. Resonances denoted as * are unidentified impurities.</p> <p><strong>3. Figure 3.pxp</strong>: Experimental data for <em>Figure 3. </em>Diffusion filtered <sup>1</sup>H NMR spectrum of the NC suspension in MeOD at 1.3 equivalents PA-hex-PEG added.</p> <p><strong>4. Figure 4.pxp</strong>: Experimental data for <em>Figure 4.</em> (A) and (B) <sup>31</sup>P NMR spectra of PA-PEG and PA-hex-PEG functionalized NCs at different D<sub>2</sub>O volume %. (C) Free ligand fraction for PA-PEG and PA-hex-PEG at different D<sub>2</sub>O volume %, determined by peak deconvolution.</p> <p><strong>5. Figure 5.pxp</strong>: Experimental data for <em>Figure 5.</em> (A) Ligand exchange performed between MEEAA functionalized NCs and nitrodopamine-mPEG. (B) <sup>1</sup>H NMR spectra before and after the ligand exchange titration performed in D<sub>2</sub>O with nitrodopamine-mPEG. 1.5 equivalents of nitrodopamine-mPEG were added and the pH was kept above 5 at all times during addition, the purified nitrodopamine functionalized NC spectrum was measured at pH = 7.4. CNC = 128 µmol.L<sup>-1</sup>, corresponding to 14.4 mg NCs of this size in 2 ml D<sub>2</sub>O.</p> <p><strong>6. Figure 6.pxp</strong>: Experimental data for <em>Figure 6. </em>Effect of pH on ligand binding and stability in water for purified NCs functionalized with PA-PEG, PA-hex-PEG and nitrodopamine-mPEG. (A) Bound and unbound ligand fraction in D<sub>2</sub>O based on NMR peak deconvolution at different pH values. (B) Z-average value of NCs in DLS at different pH values. (C) Zeta potential of the NCs at different pH values. All measurements were performed at constant ionic strength (0.01 mol.L<sup>-1</sup> NaCl) at 25°C</p> <p><strong>7. Figure 7.pxp</strong>: Experimental data for <em>Figure 7.</em> Stability of functionalized NCs in different concentrations of phosphate buffered saline (PBS) at pH 7.4 and 25°C. (A) Colloidal stability of functionalized nanocrystals measured using DLS z-average values at different PBS concentrations. (B) Stability of functionalized NCs in 2X PBS over time at pH 7.4 and 25°C.</p> <p><strong>8. Figure 9.pxp</strong>: Experimental data for <em>Figure 9.</em> UV-VIS spectra of purified nitrodopamine-mPEG functionalized NCs at different pH values in H2O.</p> <p> </p>
Inverse opals with reactive surface chemistry as sensors for aqueous pollutants
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Raw Data for "Chemical etching of Sb2Se3 solar cells: surface chemistry and back contact behaviour"
<p>Raw Data for "Chemical etching of Sb2Se3 solar cells: surface chemistry and back contact behaviour". <br> <a href="https://doi.org/10.1088/2515-7655/ab3c98">https://doi.org/10.1088/2515-7655/ab3c98</a>.</p>
Surface Ozone–NOx–VOCs Chemistry in China: New Insights from GEMS Satellite Hourly Observations
<p>GEMS satellite data and ground level ozone fitting codes</p>
Achieving high hybridization density at DNA biosensor surfaces using branched spacer and click chemistry
<p>Raw data and metadata associated to the study " Achieving high hybridization density at DNA biosensor surfaces using branched spacer and click chemistry".</p> <p>Copy of labbook for synthetic procedures and surface functionalization procedures.</p> <p>Data for surface characterizations (XPS measurements and fluorescent quantification).</p> <p>Data for molecular characterizations: NMR and Mass Spectrometry.</p>
USEPA EMAP Surface Waters Lake Database Northeast Lake Water Chemistry Data, 1991-1994
The primary function of the lake water chemistry samples, collected with a van Dorn sampler, is to determine acid-base status, trophic state, and classification of water chemistry type. Water chemistry in lakes is analyzed for two purposes. First, to understand the chemical habitat within which biota must exist so that we can understand the biological potential of the system and second, to evaluate the chemical quality of the water for the purposes of determine the potential stresses to which the biota are exposed. Water chemistry parameters are reported for one sample taken at the location of the deepest part of the lake by a van Dorn sampler from a depth of 1.5 m. These include: aluminum, alkalinity, acid neutralizing capacity, calcium, carbonate, color, specific conductance, dissolved inorganic carbon, dissolved organic carbon, bicarbonate, potassium, magnesium, ammonium, sodium, nitrate, total nitrogen, pH, total phosphorus, silica, total suspended solids, turbidity, and chlorophyll-a. Sampling was initiated July 1991 and ended September 1994.
Hubbard Brook Experimental Forest: Synoptic Surface Water Chemistry, 2015
This dataset presents field and analytical data collected during a synoptic surface water sampling survey on July 22-23, 2015. Watershed 3, watershed 9, and the upper west branch of Zig Zag Brook were included. Some results from these three catchments were published by Bailey et al. 2019, Frontiers in Earth Science. Additional sampling sites not included in this publication were on Paradise Brook, between weir 3 and its outlet to Hubbard Brook, and along the main stem of Hubbard Brook in the western portion of the valley. Sampling sites are designated as stream sites or seeps. Seeps are either off of the stream channel or are at anomolously perennial channel initiation points and are presumed to represent "longer, deeper" flowpaths where groundwater discharges to the surface. Seeps are typically characterized as having relatively low water temperature in the summer, and with chemistry contrasting from adjacent stream sites. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Surface chemistry of a [C2C1Im][OTf] (sub-)wetting layer on Pt(111): a combined XPS, IRAS and STM study
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List of Figures for the planned paper entitled "The influence of surface chemistry of activated carbons on adsorption and freezing/melting processes"
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Data from: How atmospheric chemistry and transport drive surface variability of N2O and CFC-11
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NARSTO SOS99 Nashville Tennessee Valley Authority (TVA) Surface Meteorology and Chemistry Data
NARSTO_SOS99NASH_SURFACE_MET_CHEM_DATA is the North American Research Strategy for Tropospheric Ozone (NARSTO) SOS99 Nashville Tennessee Valley Authority (TVA) Surface Meteorology and Chemistry Data product. Data was collected between June 15 and July 16, 1999 during the 1999 Nashville/Middle Tennessee Field Study. TVA operated two enhanced (Level 2) surface-level monitoring stations during the study. One of the level 2 stations was located on the top of the James K. Polk Building in downtown Nashville. The other level 2 station was located about 40 miles west of Nashville near Cumberland Furnace in Dickson County. Gas measurements (5-minute averaged concentrations) included sulfur dioxide (SO2), carbon monoxide (CO), ozone (O3), nitrogen oxide (NO), nitrogen dioxide (NO2), and total oxides of nitrogen (NOY). The meteorological measurement package included wind speed (WS), wind direction (WD), temperature (T), relative humidity (RH), and solar radiation (RAD). North American Research Strategy for Tropospheric Ozone (NARSTO), which has since disbanded, was a public/private partnership, whose membership spanned across government, utilities, industry, and academe throughout Mexico, the United States, and Canada. The primary mission was to coordinate and enhance policy-relevant scientific research and assessment of tropospheric pollution behavior; activities provide input for science-based decision-making and determination of workable, efficient, and effective strategies for local and regional air-pollution management. Data products from local, regional, and international monitoring and research programs are still available.
Multi-parametric profiling of a large panel of engineered nanomaterials (ENM) points to surface chemistry as a key determinant of nanomaterial effects
GEO Series GSE148705. Homo sapiens. 96 samples. Type: Expression profiling by array.
Low-Dose Silver Nanoparticle Surface Chemistry and Temporal Effects on Gene Expression in HepG2 Cells
GEO Series GSE143717. Homo sapiens. 32 samples. Type: Expression profiling by high throughput sequencing.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.