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8 results for “Silicon particles”
Unveiling the potential of redox chemistry to form size tunable, high index silicon particles
<p>In the present work, the effect of changing the precursor ratio of silicon between sodium silicde and a hexacoordinated silicon complex to form various sizes of particles is studied. TEM images show the size difference between particles produced with different ratios. Particles produced with a 1:1 ratio are 45 nm in diameter and up to a 1:4 precursor ratio is used to make 230 nm particles. X-ray diffraction patterns confirm the presence of crystalline silicon for all sizes, while Raman spectroscopy shows how different degree of oxidation occurs thanks to different particle sizes, shifting the Raman peak. The surface chemistry is also studied to evidence the growth mechanism.</p>
Understanding the formation mechanisms of silicon particles from the thermal disproportionation of hydrogen silsesquioxane
<p><strong>Data set</strong> from Understanding the formation mechanisms of silicon particles from the thermal disproportionation of hydrogen silsesquioxane.<br> <br> - Publication : Cibaka-Ndaya C., O'Connor K., Opeyemi Idowu E., Parker M. A., Lebraud E., Lacomme S., Montero D., Sanz Camacho P., Veinot J. G.-C., Roiban I.-L., Drisko G. L.. Understanding the formation mechanisms of silicon particles from the thermal disproportionation of hydrogen silsesquioxane. <em>Chemistry of Materials</em>, In press, <a href="https://dx.doi.org/10.1021/acs.chemmater.3c01448">⟨10.1021/acs.chemmater.3c01448⟩</a>. <a href="https://hal.science/hal-04211253">⟨hal-04211253⟩</a><br> <br> <strong>Dataset production context : </strong> Crystalline silicon particles sustaining Mie resonances are readily obtained from the thermal processing of hydrogen silsesquioxane (HSQ). Here, the mechanisms involved in silicon particle formation and growth from HSQ are investigated through real time in situ analysis in an environmental transmission electron microscope and X-ray diffractometer. The nucleation of Si nanodomains are observed starting around 1000 °C. For the first time, a highly mobile intermediate phase is experimentally observed, thus demonstrating a previously unknown growth mechanism. At least two growth processes occur simultaneously: the coalescence of small particles into larger particles and a growth mode by particle displacement through the matrix toward the HSQ grain surface. Post-synthetic characterization by scanning electron microscopy further evidences the latter growth mechanism. The gaseous environment employed during synthesis impacts particle formation and growth under both in situ and ex situ conditions, impacting particle yield and structural homogeneity. Understanding the formation mechanisms of particles provides promising pathways for reducing the energy cost of this synthetic route.<br> <br> <br> <strong>For more information see the article.</strong></p>
Silicone oil droplet full of fluoresent particle moving on a conical fiber
<p>Chapter 5 - Droplets on a conical fiber. Video of a silicone oil droplet moving on a conical fiber.</p> <p>The droplet is full of fluorescent particles which facilitates the visualization of internal liquid motion. The red vertical line marks the expected position where the droplet's shape transitions. On the left of this line, the droplet exhibit a barrel shape, while on the right, it has a clamshell shape. </p> <p>Volume of the droplet : 4 µl <br>Half-angle of the cone : 6° <br>Silicone oil viscosity : 50 cSt</p>
Data from: Novel amphiphilic polyvinylpyrrolidone (PVP) functionalized silicone particles as carrier for low cost lipase immobilization
The high catalytic activity, specificity and stability of immobilization lipase have been drawn a great interests. How to reduce the cost of support materials has always been a hot topic in this field. Herein, for the development of low-cost immobilized lipase, we demonstrate an amphiphilic polyvinylpyrrolidone (PVP) grafted on silicone particles (SP) surface materials (SP-PVP) with rational design based on interfacial activation and solution polymerization. Meanwhile, the hydrophilic pristine SP and hydrophobic polystyrene-corded silicone particles (SP-Pst) were also prepared for lipase immobilization. The SP-PVP were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transforms infrared spectroscopy and thermogravimetry. Our results indicated that the lipase loading amount on the SP-PVP composites was about 215 mg of protein per g. In the activity assay, the immobilized lipase SP-PVP@CRL exhibited higher catalysis activity, better thermostability and reusability than that of SP@CRL and SP-Pst@CRL. The immobilized lipase retained more than 54 % of its initial activities after 10 times reuse and approximately trended to a steady in the following cycles. By introducing the interesting amphiphilic polymer to these cheap and easily obtained silicone particles (SP) surface, the relative performance of immobilized lipase can be significantly improved, rendering interactions between the low cost supports materials and lipase.
Data from: Novel amphiphilic polyvinylpyrrolidone (PVP) functionalized silicone particles as carrier for low cost lipase immobilization
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Silicone Particles in Breast Implant Capsules
ClinicalTrials.gov study NCT06257251. IPD Sharing: NO. Countries: 1. Publications: 0.
Response of mammary tissue to high-LET HZE particle (Silicon ions) radiation or low-LET gamma-rays
GEO Series GSE48392. Mus musculus. 37 samples. Type: Expression profiling by array.
Response of mammary tissue to high-LET HZE particle (Silicon ions) radiation or low-LET gamma-rays
Transcriptional profiling of mammary tissue irradiated at 10 weeks of age with either 100 cGy sparsely ionizing gamma-rays, or 10 cGy or 30 cGy densely ionizing radiation (350 MeV/amu Si). Mammary tissue was collected 1 weeks, 4 weeks, and 12 weeks post-irradiation. Four radiation treatment groups: sham, 100 cGy sparsely ionizing gamma-rays, 10 cGy or 30 cGy densely ionizing radiation (350 MeV/amu Si). Three time points post-irradiation (1, 4, and 12 weeks). Three or four replicates per time point.
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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.