Relevant bibliographies by topics / Thermo-optical property

Academic literature on the topic 'Thermo-optical property'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Thermo-optical property"

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Leet, S. J., L. B. Fogdall, and M. C. Wilkinson. "Thermo-optical property degradation of irradiated spacecraft surfaces." Journal of Spacecraft and Rockets 32, no. 5 (September 1995): 832–38. http://dx.doi.org/10.2514/3.26692.

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Thomas, Jeena, Prakash Perikaruppan, Vinoy Thomas, Jancy John, Raji Mary Mathew, Joice Thomas, Ibrahimkutty Rejeena, Sebastian Mathew, and Abdulhassan Mujeeb. "Green Synthesized Plasmonic Silver Systems for Potential Non-Linear Optical Applications: Optical Limiting and Dual Beam Mode Matched Thermal Lensing." Australian Journal of Chemistry 72, no. 6 (2019): 460. http://dx.doi.org/10.1071/ch18617.

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Bioactive compound functionalized plasmonic systems are evolving as a promising branch of nanotechnology. In this communication the synthesis of bioactive compound mimosine-based silver nanoparticles (AgNPs) and their non-linear optical and thermo-optic properties are presented. UV-Visible spectroscopy, optical bandgap measurement, fluorescence spectroscopy, and high-resolution transmission electron microscopy (HRTEM) techniques were used to characterize the synthesized AgNPs. An open aperture z-scan technique was used to determine the non-linear optical parameters. A very strong reverse saturable absorption (RSA) and low optical limiting threshold were observed for the present mimosine decorated AgNP system. The thermo-optic property of the present system was evaluated using a highly sensitive dual beam mode matched thermal lensing spectroscopic technique. A comparison of the low limiting threshold (242MWcm−2) and thermo-optic property (thermal diffusivity, D=1.13×10−7m2s−1) with similar systems proves its capability for non-linear optical and thermo-optic applications.
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Cho, Hyunmin, Jinhyeong Kwon, Inho Ha, Jinwook Jung, Yoonsoo Rho, Habeom Lee, Seungyong Han, Sukjoon Hong, Costas P. Grigoropoulos, and Seung Hwan Ko. "Mechano-thermo-chromic device with supersaturated salt hydrate crystal phase change." Science Advances 5, no. 7 (July 2019): eaav4916. http://dx.doi.org/10.1126/sciadv.aav4916.

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Active control of transparency/color is the key to many functional optoelectric devices. Applying an electric field to an electrochromic or liquid crystal material is the typical approach for optical property control. In contrast to the conventional electrochromic method, we developed a new concept of smart glass using new driving mechanisms (based on mechanical stimulus and thermal energy) to control optical properties. This mechano-thermo-chromic smart glass device with an integrated transparent microheater uses a sodium acetate solution, which shows a unique marked optical property change under mechanical impact (mechanochromic) and heat (thermochromic). Such mechano-thermo-chromic devices may provide a useful approach in future smart window applications that could be operated by external environment conditions.
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Qiu, Feng Xian, Dong Ya Yang, Qing Zhang, and Guo Rong Cao. "Aggregation, Isomerization and Thermo-Optic Property of Azobenzene Polyelectrolyte." Advanced Materials Research 123-125 (August 2010): 851–54. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.851.

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A novel azobenzene polyelectrolyte (ABAPE) was synthesized based on chromophore 4-(4’-nitrophenylazo) naphthol (NPAN), epoxychloropropane and α-methacrylic acid. The ABAPE was characterized by FT-IR and UV-vis spectroscopy. The aggregation behaviors of ABAPE were investigated based on different pH values by the UV-vis spectroscopy. The isomerization behavior of the ABAPE in DMAC solution was studied by 256 nm UV irradiation light. Attenuated total reflection (ATR) method was adopted and carried out the measurement of refractive index of the thin film. The thermo-optic coefficient (dn/dT) was -2.9228×10-4°C-1 and was bigger than inorganic materials such as silica glass, zinc silicate glass, borosilicate glass and the organic materials of polystyrene and PMMA. These results showed that the polyelectrolyte could be used to carry out optical storage and thermo-optic switch.
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Cao, Zhijuan, Fengxian Qiu, Guorong Cao, Yijun Guan, Lin Zhuang, Qiang Shen, Qing Wang, Feiyan Ye, and Dongya Yang. "Synthesis, Optical Property, and Simulation of Thermo-Optic Switch of Novel Azopolymer." International Journal of Polymeric Materials 62, no. 12 (June 18, 2013): 613–19. http://dx.doi.org/10.1080/00914037.2012.761628.

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Ha, Heon-Woo, Soo-Jin Kang, Sung-Hyeon Han, Tae-Gyu Kim, and Hyun-Ung Oh. "Optimization of Thermo-optical Property for Electrostatic Actuating MEMS-based Variable Emissivity Radiator." Journal of the Korean Society for Aeronautical & Space Sciences 43, no. 2 (February 1, 2015): 149–55. http://dx.doi.org/10.5139/jksas.2015.43.2.149.

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Ge, Chang Hong, Feng Xian Qiu, Xiao Xian Gu, and Dong Ya Yang. "Synthesis, Photoisomerization and Thermo-Optic Property of Azo Optically Active Polymer." Materials Science Forum 663-665 (November 2010): 41–44. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.41.

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A novel azobenzene optically polymer (P-DA) was synthesized based on the azo chromophore molecule, chiral reagent L(-)-tartaric acid, acryloyl chloride and methacrylate. The P-DA was characterized by FT-IR, UV-Vis spectroscopy, 1H NMR, DSC and TGA. The P-DA had high thermal stability up to its glass-transition temperature (Tg) of 110 oC and 5 % heat weight loss temperature of 199 oC. The UV-induced trans/cis photoisomerization and reflex-isomerization behaviors were investigated. The results indicated that the P-DA solution could undergo photochromism after irradiated by 365 nm UV light. The optical parameters: refractive index (n), the dielectric constant (ε) and thermal volume expansion coefficient (β) of P-DA were obtained. The thermo-optic coefficients are one order of magnitude larger than those of the inorganic materials, such as SiO2 (1.1×10−5 oC -1 and LiNbO3 (4×10−5 oC -1) and was larger than the organic material such as polystyrene (-1.23×10-4 oC -1) and PMMA (-1.20×10-4 oC -1). The conclusion had a little significance to develop optical communication.
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Cai, Chang Long, Ya Zhang, Xiao Ling Niu, and Wei Guo Liu. "Research on Non-Electric Readout Infrared Thermal Imaging Detection Technology Based on the Liquid Crystal." Solid State Phenomena 181-182 (November 2011): 293–96. http://dx.doi.org/10.4028/www.scientific.net/ssp.181-182.293.

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Liquid crystal, as a condensed matter, is a phase state between crystal and isotropic liquid. On the one hand, it has mobility and continuity as a liquid, and on the other hand, it has arranging ordering as a crystal, then it has many unique properties. Because the factors, such as heat, electric field, magnetic field, pressure, and so on, will easily influence the arranging of liquid crystal molecular, so once it is excited externally, its optical properties will be changed. At present, most research on the theory and application of liquid crystal mainly focus on the display. Thermo-optic effect is defined as the phenomenon that the optical properties of liquid crystal change with the changing of temperature. At the phase transition point, the thermo-optic effect of liquid crystal is very obvious. In this paper, non-electric readout infrared thermal imaging detection technology based on the optical rotation property of the cholesteric liquid crystals is mainly researched. Through the research, the cholesteric liquid crystals’ light curves, gray value curves and CCD image were obtained under different temperatures; it proved that using the optical rotation property of cholesteric liquid crystals to achieve the infrared imaging of hot objects is possible.
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Cao, Zhijuan, Fengxian Qiu, Qing Wang, Guorong Cao, Yijun Guan, Lin Zhuang, Xiaolong Xu, Jie Wang, Qian Chen, and Dongya Yang. "Preparation, thermo-optic property and simulation of optical switch based on azo benzothiazole polymer." Applied Physics B 111, no. 1 (January 23, 2013): 93–102. http://dx.doi.org/10.1007/s00340-012-5311-3.

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Ju, Hyun Kyung, Yongku Kang, Changjin Lee, and Dong Wook Kim. "Fluorinated Polymers Derived from Tetrafunctional Cyclic Siloxanes Possessing Low Optical Loss and High Thermo-Optic Property." Molecular Crystals and Liquid Crystals 520, no. 1 (April 13, 2010): 136/[412]—143/[419]. http://dx.doi.org/10.1080/15421400903584234.

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Dissertations / Theses on the topic "Thermo-optical property"

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Chen, Lu Guang, and s3064076@student rmit edu au. "Thermo-Optical Properties of Polymer Dispersed Liquid Crystals." RMIT University. Applied Science, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080206.114823.

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Polymer dispersed liquid crystal (PDLC) films, consisting of micro-sized domains of a liquid crystal dispersing in a polymer matrix, serve as the basis of a variety of high-efficiency electro-optical effects. The thermo-optical properties of the PDLCs were investigated in this thesis. The thermal properties and the morphologies of four low molar mass mesogens were studied by DSC and polarized optical microscope (POM). There were significant super cooling/heating effects on the first order phase transitions but not on the mesophase transitions. The structural effects on the transition temperature were investigated. Between the two 4-alkoxybenzoic acids mesogens, the clearing temperature of 4-(octyloxy)benzoic acid was higher than 4-(decyloxy)benzoic acid because of the increasing chain length. Trans-4-methoxycinnamic acid had the highest melting temperature among the four mesogens despite the molar mass because the carboxylic acid termini of trans-4-methoxycinnamic acid gave rise to strong intermolecular attractions. The smectic phases of 4-(octyloxy)benzoic acid were classified as head-to-head bilayer orientational smectic structures, SmA2 and SmC2, respectively, by wide angle X-ray diffraction through measuring the d spacing of the liquid crystal. The total solubility parameter was used to evaluate matching a polymer-LC-solvent combination. PDLC films were prepared by the solvent induced phase separation method and suitable morphologies were achieved by thermal induced phase separation. The phase transition temperatures of PDLCs were shifted to a lower temperature due to the polymer dispersion effects. Different mesophases were observed in PDLC films when LC exhibited different mesophases. The LC fractions in the droplets were calculated from the nematic to isotropic enthalpies through the Smith equation. Two factors, thermal cooling rate and the LC concentration, which affect the size of the droplet dispersed in the polymer matrix, were investigated in the PVC dispersed 4,4'-azoxyanisole. The phase transitions of pHEMA dispersed 4-(octyloxy)benzoic acid and PVC dispersed 4,4'-azoxyanisole were investigated by TMDSC and quasi-isothermal TMDSC. The TMDSC results were analysed by the two approaches, reversing and non-reversing heat flow and complex heat capacity. The results of the phase transitions of the two PDLCs illustrated that in the PDLCs it involved both non-reversing, melting, and reversing, clearing and the transition between two mesophases. In the non-reversing transition, the transition temperature would be affected by super cooling/heating and the results obtained in the experiments were dependent on the experimental conditions, such as the heating or cooling rate, sample size and purge gas flow rate. However, in the reversing transition process, there were no super cooling/heating effects observed and it seemed that the experimental conditions were not so critical. Results could be monitored by Lissajous figures obtained from the quasi-isothermal TMDSC. The plots of modulated heat flow versus the derivative of modulated temperature can be used to alert to unfavorable experimental conditions where loss of system linearity could be seen.
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Conference papers on the topic "Thermo-optical property"

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LEET, S., L. FOGDALL, and M. WILKINSON. "Thermo-optical property degradation of spacecraft surfaces - The effects of simulated space radiation on silver Teflon, white polyurethane paint, and fused-silica optical solar reflectors." In 28th Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-2876.

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Lin, Bochuan, Shen Zhu, Heng Ban, Chao Li, Rosalia N. Scripa, Ching-Hua Su, and Sandor L. Lehoczky. "Modified Laser Flash Method for Thermal Property Measurements and the Influence of Heat Convection." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41734.

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This study examined the effect of natural convection in the modified laser flash method for the measurement of thermo physical properties of semiconductor melts. Common laser flash method uses a laser pulse to heat the front surface of a thin circular sample and measures the temperature transient of the rear surface. Thermal diffusivity is calculated based on the analysis of the transient heat conduction process. For semiconductor melts, the sample is contained in a specially designed quartz cell with optical windows. When the laser pulse heats the melt front surface, the resulting natural convection can introduce errors in the calculation of thermal diffusivity based on the heat conduction model. The effect of natural convection was evaluated by Computational Fluid Dynamics (CFD) simulations in this study. The results indicated that natural convection can decrease the time needed for the rear surface to reach its peak temperature, and can also decrease the peak temperature slightly. Based on our experimental data for Tellurium, the calculation using only heat conduction model resulted in a thermal diffusivity about 3% greater than that using the heat transfer model with natural convection.
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