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Bui Hung Thang,Pham Van Trinh,Le Dinh Quang,Nguyen Thi Huong,Phan Hong Khoi,Phan Ngoc Minh 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
Carbon nanotubes (CNTs) are some of the most valuable materials with high thermal conductivity. The thermal conductivity of individual multiwalled carbon nanotubes (MWCNTs) grown byusing chemical vapor deposition is 600 ± 100 Wm−1K−1 compared with the thermal conductivity419 Wm−1K−1 of Ag. Carbon-nanotube-based liquids – a new class of nanomaterials, have shownmany interesting properties and distinctive features offering potential in heat dissipation applicationsfor electronic devices, such as computer microprocessor, high power LED, etc. In this work,a multiwalled carbon-nanotube-based liquid was made of well-dispersed hydroxyl-functional multiwalledcarbon nanotubes (MWCNT-OH) in ethylene glycol (EG)/distilled water (DW) solutionsby using Tween-80 surfactant and an ultrasonication method. The concentration of MWCNT-OHin EG/DW solutions ranged from 0.1 to 1.2 gram/liter. The dispersion of the MWCNT-OH-basedEG/DW solutions was evaluated by using a Zeta-Sizer analyzer. The MWCNT-OH-based EG/DWsolutions were used as coolants in the liquid cooling system for the Intel Core i5 processor. Thethermal dissipation efficiency and the thermal response of the system were evaluated by directlymeasuring the temperature of the micro-processor using the Core Temp software and the temperaturesensors built inside the micro-processor. The results confirmed the advantages of CNTs inthermal dissipation systems for computer processors and other high-power electronic devices.
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Nguyen Van Hung,Bui Thi Minh Nguyet,Nguyen Huu Nghi,Nguyen Mau Thanh,Nguyen Duc Vu Quyen,Vo Thang Nguyen,Dao Ngoc Nhiem,Dinh Quang Khieu 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3
In this study, longan seeds - an agricultural by-product was used to fabricate activated carbon (LSAC) through two-step pyrolysis with pre-carbonization at low temperature in the first step and then activation by H3PO4. LSAC with large surface area and porous structure exhibits an excellent capacity of absorption towards both cationic dyes (methylene blue (MB), rhodamine-B (RhB)) and anionic dyes (methyl orange (MO), congo red (CR)). Experimental data can be described well by the pseudo-second kinetic model. The maximum adsorption capacity based on Langmuir isotherm model was found as 502.84; 397.77; 464.66 and 350.64 mg.g−1 for MB, RhB, MO and CR, respectively. The adsorption of MB, RhB and CR on LSAC is spontaneous and endothermic, while that for MO is spontaneous but exothermic. Furthermore, the adsorption mechanism of dyes on LSAC was also studied showing that it can occur by electrostatic interaction, hydrogen bonding, the filling of pores involving the interaction between dye ions with specific functional groups such as –OH, –COOH, –NH2 and –PO43− on the LSAC surface. These results suggest that LSAC material may be envisaged as a promising adsorbent for treatment of wastewater in textile industries.
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Effect of precursors on Cu2S counter electrode on the quantum dot sensitized solar cell performance
Phuong Ho Nhat,Van Man Tran,Tung Ha Thanh,Jun H. K.,Van Thang Bui,Vinh Lam Quang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.12
Counter electrode of Cu2S on fuorine-doped tin oxide glass, which was synthesized by chemical bath deposition method in a nitrogen-purged environment with varying precursors and temperatures, is used for quantum dot sensitized solar cell fabrication. The morphology, composition and crystalline structure of the Cu2S flm were characterized by scanning electron microscopy, energy dispersive X-ray and X-ray difraction analysis. Electrochemical properties of the Cu2S flm were measured by cyclic voltammetry measurement and the highest performance of JSC=18.2 mA/cm2 , VOC=0.57 V, FF=0.38 and η=3.94% were recorded in the cell fabricated by the mixture of CuSO4 and Na2S2O3 precursors (1.0/1.0 ratio). It is the result of the enhancement of electrocatalytic activity, charge transfer and collection, and excited electron lifetime.
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Bach, Long Giang,Cao, Xuan Thang,Quynh, Bui Thi Phuong,Ho, Van Thi Thanh,Lim, Kwon Taek Informa UK (TaylorFrancis) 2017 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.644 No.1
<P>In this study, a facile method for synthesis of conducting polymer/inorganic oxide hybrid nanocomposites, the poly(N-vinylcar bazole)/Titanium Dioxide (PVK-g-TiO2), was successfully developed via direct facile esterification reaction under extremely mild conditions. The TiO2 nanoparticles (TiO2 NPs) were first modified by 3-glycidoxypropyl trimethoxysilane in order to prepare the epoxy groups functionalized TiO2 NPs, followed by refluxing with ethanol solution of hydrochloric acid to convert the epoxy groups into alkyl-hydroxyl units. A sufficient amount of PVK was then grafted onto the as-modified TiO2 NPs via esterification reaction between the alkyl-hydroxyl units at the nanoparticle surface and the carboxyl-terminated PVK chains. Fourier transform infrared spectroscopy, Energy dispersive X-Ray, X-ray diffraction and thermogravimetric analysis were used to study the chemical and physical properties in surface functionalities.</P>
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