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Investigation on the key aspects of l-arginine para nitrobenzoate monohydrate single crystal:A non-linear optical material

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Chinese Journal of Chemical Engineering 2019年第3期27卷 701-708页

作者： Sonia N.Vijayan Mahak Vij Kanika Thukral Naghma Khan D.Haranath Rajnikant M.S.Jayalakshmy Academy of Scientific and Innovative Research CSIR-National Physical Laboratory CSIR-National Physical Laboratory Department of Physics University of Jammu International and Inter University Centre for Nanoscience and Nanotechnology Mahatma Gandhi University

In the contemporary days, non-linear optical materials(NLO) are getting higher attention as per the increasing demand in optical communication and data storage technology. Consequently, they explore various physical properties of the NLO material for their industrial applications. In current report, l-arginine p-nitrobenzoate monohydrate(LANB) single crystals were obtained by adopting slow cooling technique. The structural confirmation of grown single crystal was carried out using single crystal X-Ray diffractometer. Presence of strain within single crystal was deduced using Hall–Williamson relation. Various defects associated within single crystal were assessed using high resolution XRD. Additionally, its crystalline quality was again confirmed by time resolved photoluminescence spectroscopy(TRPL). Using transmission spectra, the cut off wavelength and band gap of the host material was determined to be nearly 420 nm and 2.9 e V respectively. The dielectric property has been recorded by varying the frequency ranging from 50 Hz to 100 k Hz. The curve suggests that dielectric loss value is less at high frequency ensures the suitability of crystal in photonics and NLO based *** laser damage threshold values were also measured for single and multiple shots. thermal parameters of the titled compound were calculated using PPE. In photoconductivity measurement, negative photoconductivity has been observed in titled compound. Microhardness studies were also performed on single crystal to explore its mechanical properties.

关键词： Photoluminescence thermal conductivity Specific heat thermal effusivity Damage threshold

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Study of the thermal Characteristics of a Geomaterial:Case of SavèGranites in the Republic of Benin

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Journal of Environmental Science and Engineering(A) 2023年第4期12卷 151-161页

作者： Koffi Judicaël Agbelele Daniel Yemalin Agossou Kocouvi Agapi Houanou Bachir Kolade Adelakoun Ambelohoun Sakala Complice Decoursel Curtis Gérard Gbaguidi Aïsse Higher Normal School of Technical Education(ENSET) LokossaRepublic of Benin Laboratory of Materials and Structures(LAMS) Verechaguine AK Higher SchoolCotonouRepublic of Benin Laboratory of Energetics and Applied Mechanics(LEMA) EPAC UACAbomey-CalaviRepublic of Benin Civil Engineering Testing and Research Laboratory(L2EGC) ENSTPAbomeyRepublic of Benin

This work focuses on the valorization of local *** rock that is granite,a material used in construction thanks to its mechanical resistance,is the subject of our *** granite of the commune of Savè,made it possible to appreciate the thermal behavior of this rock studied with a view to its use as a building *** this end,a thermal diffusivity measurement test was carried out on this ***,we made samples which were then connected to a data acquisition box via thermocouples.A Python script is used to ensure the collection of temperature values over *** this thermal diffusivity test carried out on the granite taken from the Savèbreasts,we obtained an average diffusivity a=5.84×10^(-6)m^(2)/*** a result,the thermal effusivity and the heat capacity of the material were determined having respectively the value 1,351.09 J/(K·m^(2)·s^(1/2))and 547,945.21 J/(m^(3)·K).These different results highlight a thermal characterization of Savègranites as a relevant material in the design and construction of an energy-efficient eco-housing.

关键词： Local materials thermal diffusivity thermal conductivity thermal effusivity heat capacity

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