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- 저자 : Houbin Li (검색결과 5 건)
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Yu Huang,Houbin Li,Xiongzhi Zhang,Kaiqiao Fu,Chi Huang,Shiju Yuan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
In the present study, a series of cationic spherical polyelectrolyte brushes (CSPB), consisting of a silicacore and a shell of copolymer of acrylamide (AM) and [2-(methacryloyloxy)ethyl] trimethylammoniumchloride (METAC), were synthesized. Then a dual-component system which was composed of CSPB andanionic polyacrylamide (APAM) was used to improve the retention and drainage properties of bleachedeucalyptus kraft pulp and precipitated calcium carbonate (PCC). Comparative researches about retentionand drainage properties between CSPB/APAM system and cationic starch/APAM system wereundertaken as well. Results showed that further improvement in first-pass retention (FPR) of pulp,FPR of PCC and drainage time could be achieved by CSPB/APAM system. It was also found that increase ofshear intensity led to a decrease in retention efficiency, while it had no significant influence on drainagetime of pulp. However, due to the symmetrical or quasi-symmetrical spherical brush structure, CSPB stillshowed better retention efficiency than cationic starch under different turbulent conditions. Furthermore, the flocculation mechanism of the CSPB/APAM dual-component system was proposedin the paper.
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Ultra-High Damping Capacity of Oxide Reinforced Magnesium Matrix Composites by In Situ Synthesis
Diqing Wan,Jiajun Hu,Houbin Wang,Yinglin Hu,Lili Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
In this work, in situ oxidation and particle-dispersed methods are successfully used to prepare novel oxide/Mg compositeswith ultra-high damping capacity starting from pure Mg as the matrix. Successful incorporation of the MgO particles into theMg matrix is experimentally demonstrated, and the role of the oxide in enhancing the damping capacities of the compositesis examined in detail. The increased damping capacity of the composites with respect to the pure magnesium is attributedto an increased dislocation density and the introduction of interface damping. In the temperature-dependent damping tests,two damping peaks P1and P2were found. The P1peak is considered to be related to the interaction between dislocations andimpurity atoms or vacancies. The P2peak is considered to be caused by the grain boundaries sliding.
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Yifu Zhang,Min Zhou,Meijuan Fan,Chi Huang,Chongxue Chen,Yuliang Cao,Houbin Li,Xinghai Liu 한국물리학회 2011 Current Applied Physics Vol.11 No.5
V_3O_7ㆍH_2O@C core-shell structured composites have been successfully synthesized using V_3O_7ㆍH_2O nanobelts as the cores and glucose as the source of carbon in the presence of sodium lauryl sulfate (SDS). The as-obtained V_3O_7ㆍH_2O@C core-shell materials were characterized by X-ray powder diffraction (XRD),transmission electron microscopy (TEM), elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR) and Raman spectrum. The thickness of the carbon shell can be controlled by the hydrothermal reaction time and the quantity of glucose. The surfactants have great influence on fabricating V_3O_7ㆍH_2O@C core-shell composites, which have been discussed in detail. V_3O_7@C composites were subsequently obtained through thermal treatment with V_3O_7ㆍH_2O@C. The electrochemical properties of V_3O_7@C core-shell composites were studied, indicating that the discharge capacity is still 151.2 mAh/g after 45 cycles, which is better than that of pure V_3O_7ㆍH_2O nanobelts.
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Yang Zou,Tao Zhang,Guannan Wang,Mengwen Zhou,Yabo Xiong,Shaoyun Huang,Houbin Li,Xinghai Liu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
3,3,7,7-tetrakis(difluoroamino) octahydro-1,5-dinitro-1,5-diazocine (HNFX) is a high-density energeticoxidizer with four difluoroamino groups (-NF2). In this study, 1,5-ditosyl-1,5-diazocane-3,7-dione, as animportant intermediate for synthesis of HNFX, was successfully synthesized using Swern oxidation in atraditional batch reactor and a continuousflow microreactor, respectively. 1,5-dotosyl-1,5-diazocane-3,7-dione was characterized by HPLC, FTIR, 1H NMR, 13C NMR, Mass spectrometry, and X-ray crystaldiffraction. Compared with the traditional batch reactor, the microreactor showed several advantages,including less reaction time, milder reaction temperature, higher yield and selectivity for 1,5-ditosyl-1,5-diazocane-3,7-dione. Moreover, the microreactor could ensure the safer and large-scale industrialproduction of 1,5-ditosyl-1,5-diazocane-3,7-dione. However, some solids produced in Swern oxidationwhich might block the channels (diameter of 0.3 mm) in the microreactor. To overcome the challenges,the experimental device was modified to suit for Swern oxidation, contributing to wider application ofthe microreactor. Besides, response surface methodology (RSM) was introduced and an appropriatemathematical model was built to optimize experimental conditions. The optimum experimentalparameters were recommended as 7.8 C for the reaction temperature, 7.7 mL/min for theflow rate, and6% for the concentration of oxalyl chloride. The actual yield of 1,5-ditosyl-1,5-diazocane-3,7-dione was89.7%, which was in great agreement with the highest predicted yield (90.1%).
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Yifu Zhang,Meijuan Fan,Fei Niu,Weibing Wu,Chi Huang,Xinghai Liu,Houbin Li,Xin Liu 한국물리학회 2012 Current Applied Physics Vol.12 No.3
Belt-like VO2(M) with a rectangular cross section was first synthesized by the irreversible transformation of VO2(A) at the elevated temperatures under the inert atmosphere to the best of our knowledge. The asobtained samples were characterized by a combination of techniques including XRD, SEM and TEM. The processes of converting VO2(A) to VO2(M) were briefly discussed. The as-obtained VO2(M) has belt-like morphology with a rectangular cross section with typical lengths up to several tens of micrometers,widths ranging from tens of nanometers to several micrometers, and thicknesses about 60e150 nm. The morphology and size of the VO2(M) were dependent on that of the precursor VO2(A). The phase transition properties of VO2(M) were investigated by DSC, indicating that it exhibited a strong phase transition at 67.9 ℃ in the heating cycle and 61.1 ℃ in the cooling cycle. Furthermore, the optical switching property of VO2(M) was studied by the variable-temperature infrared spectra, and it was found that the as-obtained VO2(M) could be used as the optical switch.
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