房喻
物理化学
个性化签名
- 姓名:房喻
- 目前身份:
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学术头衔:
博士生导师, 优秀教师/优秀教育工作者
- 职称:-
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学科领域:
物理化学
- 研究兴趣:物理化学
房喻,男,1956年9月出生于中国陕西省西安市。1982年元月毕业于陕西师范大学化学系,获理学学士学位,1987年7月由华中师范大学获理学硕士学位。1993年9月应邀到英国Birmingham大学化学系多糖和蛋白质工程实验室从事合作研究,1994年3月转入英国Lancaster大学大分子中心从事高分子胶体与界面和光物理应用研究,1998年3月获哲学博士学位。房喻系陕西师范大学物理化学专业教授,2004年6月起担任陕西师范大学校长。
房喻教授曾任陕西师范大学化学与材料科学学院院长,陕西师范大学副校长,现任陕西省化学会理事长,中国化学会理事,中国化学会胶体与界面化学专业委员会委员,中国化学会应用化学专业委员会委员。房喻教授是国际“Carbohydrate Polymer”,中国化学会《物理化学学报》,《应用化学》以及《分子科学学报》杂志编委。
房喻教授长期致力于物理化学教学和研究工作,先后承担科技部、国家自然科学基金委员会、教育部、总装备部等部门或机构资助课题21项,发表研究论文140余篇,申请中国发明专利3件,国防专利1件,授权2件。先后获得原国家教委科技进步二等奖、陕西省政府科技进步一等奖等奖励10余项。出版英文专著《Fluorescence Techniques in Colloids and Polymer Science》1部,出版《Internet化学资源与利用》教材1部,参与编写《物理化学进展》等著作多部。同时也是国家级精品课程《物理化学》的主持人。目前,房喻教授的研究工作主要集中在单分子层和超分子的物理化学及应用。
房喻教授1993年获得中华人民共和国政府特殊津贴,2001年被评为全国优秀教师,2002年被评为陕西省劳动模范和教育部骨干教师资助计划优秀完成人员,2003年被评为陕西省教学名师,2004年被评为全国劳动模范。
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2314
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801
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成果数
20
房喻, Hui Wang; Yu Fang; Liping Ding; Lining Gao; Daodao Hu
H. Wang et al. Thin Solid Films 440 (2003) 255-260,-0001,():
-1年11月30日
Chitosan thin films, coated on a quartz plate surface, containing pyrene (Py) and b-cyclodextrin (b-CD) units on their surfaces have been designed and prepared as novel sensing materials for nitromethane.Fluor escence studies revealed that the immobilized Py was included in the cavity of its neighbor b-CD.This structure makes the fluorescence emission of the films could not be quenched by commonly used quenchers, including copper, cobalt and some other transition metal salts, KI and acrylamide. However, addition of nitromethane quenched the emission dramatically.Considering the high selectivity and sensitivity, great reversibility and stability, wide dynamic range and long storage time, it is proposed that these novel films could be applicable to the sensing of nitromethane in some energetic fuels.
Fluorescence, Optical properties, Photon emission, Sensors
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房喻, Yang Juxiang; Fang Yu; Bai Chaoliang; Hu Daodao & Zhang Ying
Chinese Science Bulletin 2004, Vol. 49 No. 19 2026-2032,-0001,():
-1年11月30日
N-isopropylacrylamide (NIPAM) and acrylic acid (AA) copolymer microspheres with various compositions were prepared by reverse suspension polymerization technique. The microspheres thus prepared were employed as micro-reactors for the deposition of CuS. In this way, several CuS-P(NIPAM-co-AA) composite microspheres with different surface morphologies were prepared. It was demonstrated that the surface structures of the composite microspheres can be tailored to a certain extent by varying the ratio of the two monomer units in the template (microgels) and/or the amount of CuS deposited. It is in prospect that the inherent advantages of microgel templates (the size, composition, charge nature and density, and crosslinking density could be easily controlled) would make the microgel template method extremely useful in the preparation of composite microspheres with different patterned surface structures.
reverse suspension polymerization, composite microspheres, microgel templates.,
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房喻, Gao Lining; Fang Yu; Lu Fengting & Ding Liping
Science in China Ser. B Chemistry 2004, Vol. 47 No. 3, 240-250,-0001,():
-1年11月30日
A novel photo-induced luminescence film has been prepared by immobilizing pyrene on quartz plate surface via a flexible long spacer, 1,3-diaminopropane and 3-glycidoxypropyl trimethoxysilane. The film shows combined monomer and excimer emission of pyrene in both wet and dry states. Steady-state and time-resolved fluorescence emission measurements demonstrated that the excimer emission mainly came from direct excitation of ground state dimers, and/or monomers in aggregated state. Classical Birks’ scheme plays little role in the formation of the excimers. The structures of the excimers formed during the excitation are complex. Both “standard excimer” of sandwich-like fully overlapped structure and “distorted excimer” of partially overlapped structure exist in the excited state of the fluorophore. The emission of the film is sensitive to the presence of dicarboxylic acids, including ethanedioic acid, malonic acid, succinic acid, etc. The emission in the monomer and excimer region increases along with increasing the concentration of the dicarboxylic acids. The time needed for the emission to reach equilibrium depends on the nature of the acids. It has been shown that the longer the chain length of the acids, the more the time needed. This observation is explained by considering the conformational reorganization of the immobilized pyrene due to insertion of the dicarboxylic acids into the space between neighboring spacers. Experimental results from similar studies using formic acid and acetic acid are in support of this explanation. Furthermore, the response of the film to dicarboxylic acids is reversible.
pyrene, fluorescence, dicarboxylic acid, sensing property.,
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房喻, Ying Zhang, , Yu Fang, Shan Wang, and Shuyu Lin
Y. Zhang et al. Journal of Colloid and Interface Science 272 (2004) 321-325,-0001,():
-1年11月30日
Spherical poly(methacrylic acid)/PbS (PMAA/PbS) composites with a fishnet-like surface and core–shell structure were prepared by a microgel template method. The composites were prepared in two steps. Pb(Ac)2 was dissolved in MAA solution before it was polymerized into microgels in an inverse suspension system. In this way, Pb2+ was trapped within the microgel network. Then, H2S was introduced slowly into the system, and the metal ions were deposited within the microgels as PbS. The presence of PbS was confirmed by X-ray diffraction (XRD) and thermogravimetric measurements, and the morphology of the composites was characterized by scanning electron microscopy (SEM). It was found that the surface structure of the microparticles depends largely on the nature of the continuous phase of the system. The microparticles from xylene have a fishnet-like surface structure, and the inner structure and composition of the particles are different from the outer structure and composition. The surface of the particles from cyclohexane, however, appears smoother and denser than the surface of the particles from xylene. The different structure of the particle surfaces from the two systems has been attributed to the differences in template structure.
Microgels, Organic–inorganic composites, Poly(, methacrylic acid), , PbS, Template method
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房喻, Chaoliang Bai; Yu Fang; Ying Zhang; and Beibei Chen
Langmuir 2004, 20, 263-265,-0001,():
-1年11月30日
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【期刊论文】Monomolecular Layers of Pyrene as a Sensor to Dicarboxylic Acids
房喻, Lining Gao; Yu Fang; Xiangpeng Wen; Yuangang Li; and Daodao Hu
J. Phys. Chem. B 2004, 108, 1207-1213,-0001,():
-1年11月30日
A novel photoinduced luminescence film has been prepared by immobilizing pyrene on a quartz plate surface via a flexible long spacer. The film shows combined monomer and excimer emission of pyrene both in wet and dry states, and the excimer may be formed mainly by direct excitation of ground-state dimers and/or monomers in aggregates. Classical Birks’ scheme plays a little role in the formation of the excimers. The emission of the film is sensitive to the presence of dicarboxylic acids, including ethanedioic acid, malonic acid, succinic acid, etc. The emission in the monomer and excimer region increases with addition of the acids. The time needed for the emission to reach equilibrium depends on the nature of the acids. It has been shown that the longer the chains of the acids, the more time is needed. This observation is explained by considering the conformational reorganization of the immobilized pyrene due to insertion of the dicarboxylic acids into the space between neighboring spacers. Experimental results from similar studies using formic acid and acetic acid are in support of this explanation. Furthermore, the response of the film to dicarboxylic acids is reversible.
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【期刊论文】Preparation of metal sulfide–polymer composite microspheres with patterned surface structures
房喻, Yu Fang; Chaoliang Bai and Ying Zhang
Chem. Commun., 2004, 804-805,-0001,():
-1年11月30日
CuS–poly(N-isopropylacrylamide), CuS–poly(N-isopropylacrylamideco-methacrylic acid), Ag2S–poly(N-isopropylacrylamide) and Ag2S–poly(N-isopropylacrylamide-co-methacrylic acid) composite microspheres exhibiting complex surface morphologies were prepared by employing the minigel template method.
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房喻, Liping Ding; Yu Fang; Linling Jiang; Lining Gao; Xiong Yin
L. Ding et al. Thin Solid Films 478 (2005) 318-325,-0001,():
-1年11月30日
ate of the fluorophore. The position of the maximum emission of the film depends on the polarity of the medium, and it shifts from 460 nm in ethanol to 505 nm in water. The two emissions have been attributed to the emission from the blocally excitedQ state or non-charge transfer excited state of dansyl and that from the TICT excited state of the fluorophore, respectively. Existence of TICT phenomenon of the immobilized dansyl has been confirmed and studied by various fluorescence techniques, such as fluorescence lifetime measurement, steady-state and time-resolved fluorescence emission spectroscopy measurements, etc. The ratio, I505/I460, of the intensities of the two emission bands depends linearly on the concentration of water in ethanol–water mixture provided the concentration is less than 40%. Furthermore, the sensing property of the film to the mixture is reversible. D 2004 Elsevier B.V. All rights reserved.
Dansyl, Twisted intra-molecular charge transfer (, TICT), , Fluorescence, Sensor
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房喻, Fengting Lu; Yu Fang; Lining Gao; Liping Ding; Linling Jiang
F. Lu et al. Journal of Photochemistry and Photobiology A: Chemistry 175 (2005) 207-213,-0001,():
-1年11月30日
A novel fluorescence film sensor was designed and prepared to improve the performance of the film sensors reported recently for dicarboxylic acids. The reported sensors suffered from slow response and low sensitivity to the analytes. Simple elongation of the spacer by using 1, 4-diaminobutane instead of 1, 2-diaminoethane or 1, 3-diaminopropane improved the performances of the film sensors greatly. The response time was reduced from tens of minutes, or even hundreds of minutes to less than 10 min, and the sensitivity was improved from more than 10mM to tens of micro-molars. Similar to the reported films, the new film also shows combined monomer and excimer emission of pyrene (Py) both in wet and dry states, and both the emissions in the monomer and excimer regions increases along with addition of dicarbonxylic acids. The excimer formed in the present film, however, mainly adopts, especially in aqueous phase, sandwich-like structure. The differences in the photophysical behavior and the improvement in the sensing performance mentioned above have been attributed to the increase in the length of the spacer, which makes the spacer in the present film more flexible and gives the sensing molecule more chance to form perfect excimers. Furthermore, the response of the film to dicarboxylic acids is well reversible.
Fluorescence, Film sensor, Dicarboxylic acids, Pyrene
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【期刊论文】Dansyl-based fluorescent film sensor for nitroaromatics in aqueous solution
房喻, Jianping Kang; Liping Ding; Fengting L u; Shujuan Zhang and Yu Fang
Institute of Physics Publishing Journal of Physics D: Applied Physics J. Phys. D: Appl. Phys. 39 (2006) 5097-5102,-0001,():
-1年11月30日
We demonstrate the preparation, characterization and performance evaluation of a fluorescent film sensor for the specific detection of nitroaromatics in aqueous solution. The film sensor was fabricated by covalent immobilization of a fluorophore, dansyl, on a glass slide surface via reaction with diaminopropane and then with an epoxide-terminated self-assembled monolayer. Nitroaromatics like nitrobenzene, 4-nitrotoluene, 3,5-dinitrotoluene, and 2,4,6-trinitrotoluene, etc were found to strongly quench the fluorescence emission of the film while some other commonly-used quenchers like nitromethane, KI, acrylamide, etc showed no or slight quenching effect on the emission. The quenching mechanism was examined through fluorescence lifetime measurements and it was proved that the quenching is static in nature and may be caused by electron transfer from the fluorophore to the nitroaromatics. The presence of other aromatics like benzene, toluene, etc had little effect upon the sensing performance of the film to nitroaromatics. Solvent effect studies revealed that the conformations adopted by the spacer connecting the fluorophore and the substrate played a crucial role in the performance of the film sensor. Furthermore, the response of the film to nitroaromatics is fast and reversible.
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