19 research outputs found
lâArginine-Catalyzed Synthesis of Nanometric Organosilica Particles through a Waterborne SolâGel Process and Their Porous Structure Analysis
We
report an efficient and easy-to-implement waterborne solâgel
process for the synthesis
of nanometric organosilica particles. In this process, tetraethyl
orthosilicate (TEOS) and 3-(methacryloxy)Âpropyl trimethoxy silane
(Îł-MPS), employed as silica sources, were heterogeneously delivered
in an aqueous solution of l-arginine, a basic amino acid
used as a catalyst, from a top organic layer. Co-condensation of TEOS
with Îł-MPS led to the formation of organosilica particles with
diameters between 30 and 230 nm when increasing the Îł-MPS content
from 0 to 10.1 mol % in the silica source. Nitrogen sorption analyses
confirmed the microporous nature of the obtained particles after calcination.
The BrunauerâEmmettâTeller (BET) surface areas increased
from 27 (before calcination) to 684 m<sup>2</sup> g<sup>â1</sup> (after calcination) for the organosilica particles containing 10.1
mol % of Îł-MPS. Fourier transform infrared spectroscopy and <sup>29</sup>Si NMR were employed to analyze the chemical structure of
the organosilica spheres and provide insight into the mechanism of
particle formation. In the second part, hybrid organosilica particles
with a coreâshell morphology were synthesized through the combination
of Pickering emulsion and the solâgel process. Îł-MPS
emulsion droplets stabilized by tiny silica particles (formed in a
separate step) were first generated and used as seeds to grow a silica
shell on their surface through TEOS addition from the top organic
layer. Transmission electron microscopy and pore size analyses of
the resulting particles after calcination revealed a unique dual-porosity
structure with a mesoporous inner core and a micro/mesoporous silica
shell with ink-bottle-type pores
Enhanced formation of > C1 Products in Electroreduction of CO2 by Adding a CO2 Adsorption Component to a Gas-Diffusion Layer-Type Catalytic Electrode
SSCI-VIDE+ING+FWI:JECInternational audienc
Tailored Microstructured Hyperpolarizing Matrices for Optimal Magnetic Resonance Imaging
International audienc
Low Levels of Fecal Calprotectin 3 Months After Surgery Predict Subsequent Endoscopic Postoperative Remission in Crohn's Disease
International audienceBACKGROUND/AIMS: In Crohn's disease (CD) few data are available on the usefulness of monitoring fecal calprotectin (FC) in the early postoperative setting. We assessed prospectively the accuracy of FC measured 3 months after surgery to predict the risk of endoscopic postoperative recurrence (POR) within 1 year after resection. METHODS: In 55 consecutive CD patients who had undergone ileocolonic resection samples were collected 3 months after surgery for measuring serum CRP and FC. Endoscopic POR was assessed by ileocolonoscopy within 6-12 months (median 7 months). Receiver operating characteristic (ROC) curves were generated to assess accuracy of the markers, to determine the best threshold and to calculate sensitivity, specificity, positive and negative predictive values. RESULTS: In contrast with median CRP levels, median FC concentrations measured 3 months after surgery were significantly higher in patients who later experienced endoscopic POR (Rutgeertsââ„âi2) compared with those who stayed in endoscopic remission within the following 6-12 months (205 Όg/g IQR [106-721] vs. 103 Όg/g IQR [60-219], pâ=â0.008). Area under the ROC curve for FC was 0.71. The best cutoff value of FC to identify patients in subsequent endoscopic remission 3 months after surgery was 65 Όg/g (96% sensitivity, 31% specificity, 50% positive and 91% negative predictive values). In multivariate analysis, FCâ\textlessâ65 ”g/g at 3 months was the only factor associated with subsequent endoscopic remission. CONCLUSION: FC measured 3 months after surgery below 65 Όg/g is an accurate marker to identify CD patients who will later stay in endoscopic remission within 1 year after resection
Cubic three-dimensional hybrid silica solids for nuclear hyperpolarization
Mathieu Baudin is kindly acknowledged for his contribution to dissolution DNP experiments.International audienceHyperpolarization of metabolites by dissolution dynamic nuclear polarization (D-DNP) for MRI applications often requires fast and efficient removal of the radicals (polarizing agents). Ordered mesoporous SBA-15 silica materials containing homogeneously dispersed radicals, referred to as HYperPolarizing SOlids (HYPSOs), enable high polarization â P(1H) = 50% at 1.2 K â and straightforward separation of the polarizing HYPSO material from the hyperpolarized solution by filtration. However, the one-dimensional tubular pores of SBA-15 type materials are not ideal for nuclear spin diffusion, which may limit efficient polarization. Here, we develop a generation of hyperpolarizing solids based on a SBA-16 structure with a network of pores interconnected in three dimensions, which allows a significant increase of polarization, i.e. P(1H) = 63% at 1.2 K. This result illustrates how one can improve materials by combining a control of the incorporation of radicals with a better design of the porous network structures
The Use of Cone-Beam Computed Tomography in Management of Patients Requiring Dental Implants: An American Academy of Periodontology Best Evidence Review
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142165/1/jper0946.pd