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Emission spectroscopy of NaYF_(4):Eu nanorods optically trapped by Fresnel lens fibers

Photonics Research 2022年第2期10卷 332-339页

作者： aashutosh kumar Asa Asadollahbaik Jeongmo Kim Khalid Lahlil Simon Thiele Alois M.Herkommer Síle Nic Chormaic Jongwook Kim Thierry Gacoin Harald Giessen Jochen Flck Universite Grenoble Alpes CNRSInstitut Neel38000 GrenobleFrance 4th Physics Institute and Research Center SCoPE University of Stuttgart70569 StuttgartGermany Universite Paris Saclay CNRSLaboratoire de Physique de la Matiere CondenseeEcole Polytechnique91128 PalaiseauFrance Institute of Applied Optics and Research Center SCoPE University of Stuttgart70569 StuttgartGermany Okinawa Institute of Science and Technology Graduate University Okinawa 904-0495Japan

NaYF_(4):Eu nanorods with high aspect ratios are elaborated and optically trapped using dual fiber optical tweezers in a counterpropagating geometry. High trapping efficiency is observed using converging beams, emitted from diffractive Fresnel lenses directly 3D printed onto cleaved fiber facets. Stable nanorod trapping and alignment are reported for a fiber-to-fiber distance of 200 μm and light powers down to 10 m W. Trapping of nanorod clusters containing one to three nanorods and the coupling of nanorod motion in both axial and transverse directions are considered and discussed. The europium emission is studied by polarization-resolved spectroscopy with particular emphasis on the magnetic and electric dipole transitions. The respective σ and π orientations of the different emission lines are determined. The angles with respect to the nanorod axes of the corresponding magnetic and electric dipoles are calculated. Mono-exponential emission decay with decay time of 4–5 ms is reported. It is shown that the nanorod orientation can be determined by purely spectroscopic means.

关键词： nanorods Fresnel trapping

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The Transference Number

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Energy & Environmental Materials 2022年第2期5卷 366-369页

作者： Kevin W.Gao Chao Fang David M.Halat aashutosh Mistry John Newman Nitash P.Balsara Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Chemical and Biomolecular Engineering University of CaliforniaBerkeleyCA 94720USA Joint Center for Energy Storage Research Argonne National LaboratoryLemontIL 60439USA Chemical Sciences and Engineering Division Argonne National LaboratoryLemontIL 60439USA

The performance of rechargeable batteries and other electrochemical systems depends on the rate at which the working ion(often a cation)is transported from one electrode to the *** cation transference number is an important transport parameter that affects this *** purpose of this perspective is to distinguish between approximate and rigorous methods used in the literature to measure the transference *** emphasize the fact that this parameter is dependent on the reference frame used in the analysis;care must be taken when comparing values obtained from different sources to account for differences in reference *** present data obtained from a well-characterized *** compare rigorously determined transference numbers in two reference frames with values obtained by an approximate *** conclude with a qualitative discussion of the relationship between the transference number and salt concentration gradients that are obtained when current is drawn through a battery。

关键词： battery electrolytes concentrated solution theory ion transport reference frames transference number

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Evaluation of anti-metastatic effect of chitosan nanoparticles on esophageal cancer-associated fibroblasts

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Journal of Cancer Metastasis and Treatment 2016年第1期2卷 259-267页

作者： Pravin D.Potdar aashutosh U.Shetti Department of Molecular Medicine and Biology Jaslok Hospital and Research CentreMumbai 400026India

Aim:Esophageal cancer is one of the major types of cancers,causing death of approximately 5%of all cancer *** is due,in large part,to both relatively ineffectual and unavailable *** order to develop an effective treatment strategy against esophageal cancer,it is important to target metastatic *** the present study,we have used a cancer-associated fibroblast(CAF)cell line derived from culturing peripheral blood mononuclear cells from a metastatic esophageal cancer patient to see whether chitosan nanoparticles(Ch-Np)treatment can modulate the metastatic phenotype of CAF cells by using various cellular and molecular ***:A CAF cell line was developed from peripheral blood mononuclear cells(PBMC)from a metastatic esophageal cancer *** cells were treated with 100μg/mL of chitosan nanoparticle in vitro for the morphological and oncogenic characteristic studies,along with the expression of various genes involved in process of tumor development and *** such as Light and Phase Contrast Microscopy,cell growth rate,Scratch metastatic assay,and molecular profiling were carried out to see changes in CAF cells before and after Ch-Np ***:It was observed that CAF cells grew in monolayer and had a doubling time of 25±0.38 ***,the cells had a fibroblastic *** treatment with 100μg/mL of Ch-Np in vitro,there was an increased doubling time to 30±0.83 ***,Scratch Assay showed an inhibition in the metastatic property of these *** findings were confirmed with gene expression *** was also observed that there was complete down-regulation of metastatic genes MMP1 and MMP9 and chemokines such as CXCR-4,CXCR-7,CCR-5,and SDF-1,indicating that Ch-Np inhibited the metastatic characteristic of CAF ***:This study has shown that there was an inhibition of metastatic properties of CAF cells after treatment with Ch-Np,suggesting that Ch-Np can be a delivery system used

关键词： Cancer-associated fibroblast molecular markers metastasis chitosan nanoparticle anti-metastatic metastatic genes

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