- 标题
- 摘要
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- 实验方案
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Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties
摘要： Rigorous superposition T-matrix method is used to compute light interaction with mesocrystalline structures. The results are used to validate the applicability of effective medium theories for computing the effective optical constants of mesocrystal structures composed of optically isotropic materials. It is demonstrated that the Maxwell-Garnett theory can fit the rigorous simulation results with an average accuracy of 2%. The thus obtained refractive indexes can be used with any electromagnetic simulation software to represent the response of mesocrystals composed of optically small primary particles arranged into a cubic type lattice structures.
关键词： Mie scattering,numerical modelling,particles,mesocrystals,T-matrix,Maxwell-Garnett,light scattering,effective medium theory
更新于2025-09-04 15:30:14
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Multifunctional Magnetic Bead-Based Dynamic Light Scattering Aptasensor with Rapid and Feasible Determination of Disease-Related Biomarkers
摘要： A simple and feasible sensing strategy based on target-induced aggregation of aptasensor-conjugated multifunctional magnetic beads was designed for sensitive detection of low-abundant proteins (carcinoembryonic antigen, CEA, used as an example), coupling with dynamic light scatting technique.
关键词： Aptasensor,Cancer markers,Magnetic beads,Dynamic light scattering
更新于2025-09-04 15:30:14
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[IEEE 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Honolulu, HI, USA (2018.7.18-2018.7.21)] 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - A Quantitative Model for Estimating the Scale of Photochemically Induced Ischemic Stroke
摘要： Photothrombosis is a technique that can induce ischemic cortical infarcts using the photodynamic effect of anionic xanthene dyes, typically Rose Bengal, to cause occlusion of cerebral blood circulation. The ability to quantitatively predict the scale of the lesion in photothrombotic procedures can offer crucial insight in the development and implementation of light-induced stroke models in animals. In this article, we introduced a quantitative model that could estimate the normalized light intensity distribution in tissue which scatters photons from a collimated beam. We simulated the penetration and scattering profile of light of Rose Bengal’s characteristic absorption wavelengths in mouse cortex. We further illustrated that our model could estimate the spatial extent of effective region under photothrombotic protocols, and how this model can be used to titrate the intensity and geometry of light beams used to generate infarcts of desired dimensional characteristics.
关键词： Rose Bengal,ischemic stroke,Photothrombosis,quantitative model,light scattering
更新于2025-09-04 15:30:14
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Determination of Number Density of Particles Together with Measurement of Their Sizes by Dynamic Light Scattering
摘要： A method is proposed for measuring the size of particles in a dynamic light scattering analyzer along with a determination of their number density in suspension. It is shown that this method can be used to measure the parameters of various nanoparticles, including nonspherical ones. An experimental prototype of a dynamic light scattering analyzer for measuring the number density of nanoparticles along with their sizes is described.
关键词： number density,dynamic light scattering,extinction,nanoparticles
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Saint Petersburg, Russia (2018.10.22-2018.10.23)] 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Methods and Algorithms for Numerical Calculations in Dynamic Light Scattering Problems
摘要： The paper is concerned with the problem of the ill-conditioned task in dynamic light scattering. We briefly review general inverse methods for particle sizing via dynamic light scattering and select the most promising ones. We suggest algorithms for numerical calculations based on variation methods and demonstrate the possibilities of Tikhonov regularization algorithm by using model experiments. The accuracy of the algorithm proves to be in good agreement with the demands of biomedical experiments.
关键词： Tikhonov method,regularization,numerical calculations,dynamic light scattering,sizing
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Actual Problems of Electron Devices Engineering (APEDE) - Saratov, Russia (2018.9.27-2018.9.28)] 2018 International Conference on Actual Problems of Electron Devices Engineering (APEDE) - Strain-Tuned Multi-Channel Coupler Based on the Lateral Structure
摘要： We observe strain-induced spin-wave routing in the bilateral composite multilayer. By means of Brillouin light scattering, we study the spin-wave transport across three adjacent magnonic stripes, which are strain coupled to a piezoelectric layer. The strain may effectively induce voltage-controlled dipolar spin-wave interactions. We experimentally demonstrate the basic features of the voltage-controlled spin-wave switching. We show that the spin-wave characteristics can be tuned with an electrical field due to piezoelectricity and magnetostriction of the piezolayer and layered composite and mechanical coupling between them.
关键词： spin-wave transport,piezoelectricity,Brillouin light scattering,voltage-controlled spin-wave switching,strain-induced spin-wave routing,magnonic stripes,piezoelectric layer,magnetostriction,voltage-controlled dipolar spin-wave interactions
更新于2025-09-04 15:30:14
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Rapid classification of micron-sized particles of sphere, cylinders and ellipsoids by diffraction image parameters combined with scattered light intensity
摘要： Spatial distributions of light scattered by single particles correlate closely with their morphologies in terms of refractive index (RI) distribution. Diffraction imaging of scattered light under coherent excitation presents a unique approach to acquire and extract feature parameters for particle classification. A validated method has been applied in this study to accurately simulate diffraction imaging of light scattered by homogeneous particles and obtain calculated diffraction image (DI) data. The feature parameters of DI data have been extracted by the gray-level co-occurrence matrix (GLCM) algorithm. We have developed an unsupervised machine learning algorithm based on Gaussian mixture model (GMM) to classify 1965 particles made of single and double spheres, cylinders and ellipsoids with varied RI values in parameter space. It has been shown that selected GLCM parameters combined with integrated forward scatter intensity can provide effective markers for accurate and morphology based classification. For 1791 particles of the same RI, the mean accuracy values of classifying particles into 3 particle types range from 82.6% to 97.2%. These results demonstrate the strong potential of diffraction imaging method for rapid analysis and classification of nonspherical and homogeneous particles by the GMM classifiers that is very challenging in comparison to distinguishing biological cell types.
关键词： Image analysis,Nonspherical particle analysis,Diffraction imaging,Single light scattering
更新于2025-09-04 15:30:14
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Sequential Growth of High Quality Sub-10 nm Core-Shell Nanocrystals: Understanding the Nucleation and Growth Process Using Dynamic Light Scattering
摘要： Monodisperse sub-10 nm core-shell nanocrystals have been extensively studied owing to their important applications in catalysis, bioimaging, nanomedicine and so on. In this work, an amorphous shell component-crystallization strategy has been proposed to prepare high quality sub-10 nm NaYF4:Yb/Er@NaGdF4 core-shell nanocrystals successfully via a sequential growth process. Dynamic light scattering technique has been used to investigate the secondary nucleation and growth process of forming the core-shell nanocrystals. The size and morphologies evolution of the core-shell nanocrystals reveal that the secondary nucleation of the shell component is unavoidable after hot-injecting of the shell precursor at high temperature, which followed by dissolution and re-crystallization process (an Ostwald Ripening process) to partially produce the core-shell nanocrystals. The present study demonstrates that the size of seed nanocrystals and the injection temperature of the shell component precursor play a vital role in formation of core-shell nanostructures completely. This work will provide an alternative strategy for precisely controllable fabrication of sub-10nm core-shell nanostructures for various applications.
关键词： Seed-mediated growth,Monodisperse,Core-shell nanoparticles,Dynamic light scattering
更新于2025-09-04 15:30:14
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Low-Cost Integrated Zinc Oxide Nanorods Based Humidity Sensors for Arduino Platform
摘要： Realization of a simple integrated and low-cost intensity modulation/direct detection (IM/DD) based humidity and vapor detection system utilizing zinc oxide (ZnO) nanorods as the active material is demonstrated. The sensing device comprises of ZnO nanorods optimally grown on a glass substrate and mounted on 3D printed platform for the alignment with a green light-emitting diode (LED) set-up for edge excitation. An Arduino platform was used for signal processing of the detection of the transmitted light. Both forward and backward scattering are affected due to light leakage while propagating through the glass substrate that are further attenuated in the presence of humidity. In this work, backward scattering was found to be dominant and thus with increasing humidity a reduction in the transmitted light was monitored. When the sensor was tested in a humidity controlled environment, it was found that the output voltage drops by approximately 750 mV upon changing the relative humidity (RH) level from 35% to 90% in a non-linear fashion. The average sensitivity of the sensor was observed to be -12 mV/% throughout the tested RH levels. Sensitivity was found to be higher at -24.6 mV/% for RH’s beyond 70%. An average response time of 3.8 s was obtained for RH levels of 85% with respect to the standard ambient humidity conditions (RH 50%), which showed a quicker recovery time of 2.2 s. The proposed sensor device provides numerous advantages including low cost production, simplicity in design, ease of use and stability during handling.
关键词： light scattering,humidity sensor,nanorods,fast sensing,zinc oxide,arduino
更新于2025-09-04 15:30:14