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  • Open Access



    Yunpeng Ren, J. K. Chen*, Yuwen Zhang

    Frontiers in Heat and Mass Transfer, Vol.3, No.2, pp. 1-7, 2012, DOI:10.5098/hmt.v3.2.3001

    Abstract Heat transfer in a copper film irradiated by a femtosecond (fs) laser pulse train and by an integrated dual laser beam of a nanosecond pulse with a fspulse train was studied using the semi-classical two-temperature model. The critical point model with three Lorentzian terms was employed to characterize transient optical properties for the laser energy deposition. The effects of pulse number and separation time on the thermal response were investigated. The results showed that with the same total energy in a fs-pulse train, more pulses for shorter separation time, e.g., 1 ps, and fewer pulses for longer separation time, e.g.,… More >

  • Open Access


    Influence of Particle Size Distribution on the Optical Properties of Fine-Dispersed Suspensions

    Dmitrii Kuzmenkov1,*, Pavel Struchalin1,2, Yulia Litvintsova1, Maksim Delov1, Vladimir Skrytnyy1, Kirill Kutsenko1

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.1, pp. 1-14, 2022, DOI:10.32604/fdmp.2022.018526


    Nanofluids have great potential for solar energy harvesting due to their suitable optical and thermophysical properties. One of the promising applications of nanofluids is utilization in solar collectors with the direct absorption of light (DASC). The design of a DASC requires detailed knowledge of the optical properties of nanofluids, which can be significantly affected by the particle size distribution. The paper presents the method to take into account the particle size distribution when calculating nanofluid extinction spectra. To validate the proposed model, the particle size distribution and spectral absorbance were measured for aqueous suspension with multi-walled graphite nanotubes; the minimum… More >

  • Open Access


    Extraction, Optical Properties and Bio-Imaging of Fluorescent Composition From Moso Bamboo Shoots

    Jinlai Yang1,2,3, Liangru Wu1,2,3,*, Yanhong Pan1,2,3, Hao Zhong1,2,3

    Journal of Renewable Materials, Vol.7, No.11, pp. 1209-1219, 2019, DOI:10.32604/jrm.2019.07896

    Abstract A novel fluorescent composition was firstly isolated from natural winter fresh Moso bamboo shoots, and its optical properties were fully investigated by fluorescence spectroscopy. It could emit strong blue light both in solid and solution state, providing high fluorescence intensity in ethanol. The solution’s concentration and addition of water greatly affected the fluorescence intensity, high concentration and addition of much water could quench fluorescence. Apoptosis results showed that the fluorescent extract (0-25 mg/L) could not induce apoptosis of Hela cells. Confocal fluorescent microscopic imaging in human hepatocellular carcinoma cells (HepG2) was realized using the fluorescent extract, it could dye the… More >

  • Open Access


    Structural and Optical Properties of Graphene Oxide Prepared by Modified Hummers’ Method

    N. Selvakumar1,2, Uday Pradhan1, S.B. Krupanidhi2, Harish C. Barshilia1,*

    CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 175-185, 2016, DOI:10.3970/cmc.2016.052.173

    Abstract Graphene oxide was synthesized from graphite flakes using modified Hummers’ method. The interlayer spacings of graphite, graphite oxide and graphene oxide were measured using X-ray diffraction technique. The C/O atomic ratios of graphite oxide and graphene oxide were calculated from XPS measurements. The transformation of graphite to graphite oxide and finally to graphene oxide was clearly observed from the micro-Raman spectroscopy data and was confirmed from the FESEM micrographs. UV-VIS-NIR spectrophotometer was used to study the absorbance of graphene oxide and reduced graphene oxide samples. Finally, the chemically reduced graphene oxide was heat-treated in air to obtain chemically modified graphene. More >

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