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Novel Zwitterionic Surfactants: Synthesis and Surface Active Properties of N-(3-Alkoxy-2-Hydroxypropyl)-N, N-Dimethyl glycine Betaines 被引量:1
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作者 Jing Qu GUAN Xi You LI Chen Ho TUNG (Institute of Photographic Chemistry. Chinese Academy of Sciences. Beijing 100101) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第6期499-502,共4页
Five new zwitterionic surfactants with long chain alkyl betaine structure incorporated with hydroxylpropyl group have been synthesized. Their structures were identified by elemental analysis, IR (HNMR)-H-1, and (CNMR)... Five new zwitterionic surfactants with long chain alkyl betaine structure incorporated with hydroxylpropyl group have been synthesized. Their structures were identified by elemental analysis, IR (HNMR)-H-1, and (CNMR)-C-13. Surface tension experiments showed that these surfactants have higher surface activity than those without hydroxypropyl group. The values of CMC and gamma(CMC) of these surfactants have been determined. 展开更多
关键词 ppm Synthesis and Surface active Properties of N Novel Zwitterionic Surfactants OH OCH N-Dimethyl glycine Betaines Alkoxy-2-Hydroxypropyl
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SYNIHESIS AND SURFACE ACTIVE PROPERTIES OF OXYETHYLENATED FATTY ALCOHOL 2-HYDROXYPROPYL SULFONATES
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作者 Guang You ZHANG Shao Fen LU Ming Li SHIDepatment of Chemisty,Shandong Normal University,Jinan,250014 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第5期349-350,共2页
Synthesis and surface active properties of the oxyethylenated fatty alcohol 2-hydroxypropyl sulfonates were investigated.Of all surface active compounds studied,those with a 2-hydroxypropyl (HP) moiety in the molecule... Synthesis and surface active properties of the oxyethylenated fatty alcohol 2-hydroxypropyl sulfonates were investigated.Of all surface active compounds studied,those with a 2-hydroxypropyl (HP) moiety in the molecule are more surface-active than the corresponding compounds without it. 展开更多
关键词 HP SYNIHESIS AND SURFACE active PROPERTIES OF OXYETHYLENATED FATTY ALCOHOL 2-HYDROXYPROPYL SULFONATES CMC
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EFFECT OF STRUCTURE OF FUNCTIONAL POLYMER ACTIVE MATERIALS ON PROPERTIES OF GADOLINIUM ION SELECTIVE ELECTRODE
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作者 车吉泰 闫美兰 张万喜 《Journal of Rare Earths》 SCIE EI CAS CSCD 1990年第3期189-193,共5页
In this paper,the functional polymeric active materials were prepared by the grafting copolymerization and their structure and properties were studied.The results show that the structure and properties of these ac- ti... In this paper,the functional polymeric active materials were prepared by the grafting copolymerization and their structure and properties were studied.The results show that the structure and properties of these ac- tive materials have the relative large effects on the properties of gadolinium ion selective electrodes. 展开更多
关键词 HDPE EFFECT OF STRUCTURE OF FUNCTIONAL POLYMER active MATERIALS ON PROPERTIES OF GADOLINIUM ION SELECTIVE ELECTRODE
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Electron Donating Property and Catalytic Activity ofPerovskite-type Mixed Oxides (ABO_3) Consisting of Rare Earth and 3d Transition Metals
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作者 S.Sugunant and V.Meera(Dept. of Applied Chemistry, Cochin University of Science and Technology, Kochi-682022, India) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第3期229-231,共3页
The catalytic activity of Perovskite-type mixed oxides (LaCoO3, PrCoO3 and SmCoO3) for the reduction of cyclohexanone to cyclohexanol with 2-propanol (Meerwein-PonndorfVerley reduction) has been studied. The data have... The catalytic activity of Perovskite-type mixed oxides (LaCoO3, PrCoO3 and SmCoO3) for the reduction of cyclohexanone to cyclohexanol with 2-propanol (Meerwein-PonndorfVerley reduction) has been studied. The data have been correlated with the surface electron donor properties of these mixed oxides 展开更多
关键词 Activity type ABO3 Consisting of Rare Earth and 3d Transition Metals Electron Donating property and Catalytic Activity ofPerovskite-type Mixed Oxides
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Effects of surface chemical properties of activated coke on selective catalytic reduction of NO with NH_3 over commercial coal-based activated coke 被引量:12
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作者 Xie Wei Sun Zhongchao +3 位作者 Xiong Yinwu Li Lanting Wu Tao Liang Daming 《International Journal of Mining Science and Technology》 SCIE EI 2014年第4期471-475,共5页
Surface chemical properties of typical commercial coal-based activated cokes were characterized by Xray photoelectron spectroscopy(XPS) and acid-base titration, and then the influence of surface chemical properties on... Surface chemical properties of typical commercial coal-based activated cokes were characterized by Xray photoelectron spectroscopy(XPS) and acid-base titration, and then the influence of surface chemical properties on catalytic performance of activated cokes of NO reduction with NH3 was investigated in a fixed-bed quartz micro reactor at 150 ℃. The results indicate that the selective catalytic reduction(SCR) activity of activated cokes with the increase of its surface acidic sites and oxygen content,obviously, a correlation between catalytic activity and surface acidic sites content by titration has higher linearity than catalytic activity and surface oxygen content by XPS. While basic sites content by acid-base titration have not correlation with SCR activity. It has been proposed that surface basic sites content measured by titration may not be on adjacent of acidic surface oxides and then cannot form of NO2-like species, thus the reaction of reduction of NO with NH3 have been retarded. 展开更多
关键词 Activated coke SCR Surface chemical properties Catalytic reduction
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Microstructure and Mechanical Performance of Cu-SnO_2-rGO based Composites Prepared by Plasma Activated Sintering 被引量:2
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作者 罗国强 HUANG Jing +4 位作者 JIN Zhipeng LI Meijuan JIANG Xiaojuan SHEN Qiang ZHANG Lianmeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1152-1158,共7页
A novel chemical technique combined with unique plasma activated sintering(PAS) was utilized to prepare consolidated copper matrix composites(CMCs) by adding Cu-SnO2-rGO layered micro powders as reinforced fillers... A novel chemical technique combined with unique plasma activated sintering(PAS) was utilized to prepare consolidated copper matrix composites(CMCs) by adding Cu-SnO2-rGO layered micro powders as reinforced fillers into Cu matrix. The repeating Cu-SnO2-rGO structure was composed of inner dispersed reduced graphene oxide(r GO), SnO2 as intermedia and outer Cu coating. SnO2 was introduced to the surface of rGO sheets in order to prevent the graphene aggregation with SnO2 serving as spacer and to provide enough active sites for subsequent Cu deposition. This process can guarantee rGO sheets to suffi ciently disperse and Cu nanoparticles to tightly and uniformly anchor on each layer of rGO by means of the SnO2 active sites as well as strictly control the reduction speed of Cu^2+. The complete cover of Cu nanoparticles on rGO sheets thoroughly avoids direct contact among rGO layers. Hence, the repeating structure can simultaneously solve the wettability problem between rGO and Cu matrix as well as improve the bonding strength between rGO and Cu matrix at the well-bonded Cu-SnO2-rGO interface. The isolated rGO can effectively hinder the glide of dislocation at Cu-rGO interface and support the applied loads. Finally, the compressive strength of CMCs was enhanced when the strengthening effi ciency reached up to 41. 展开更多
关键词 graphene Cu-SnO2-rGO structure copper matrix composites sensitization plasma activated sintering mechanical property
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Activated flux tungsten inert gas welding of 8 mm-thick AISI 304 austenitic stainless steel 被引量:6
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作者 刘观辉 刘美华 +3 位作者 易耀勇 张宇鹏 罗子艺 许磊 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期800-805,共6页
AISI 304 stainless steel plates were welded with activated flux tungsten inert gas(A-TIG) method by utilizing self-developed activated flux. It is indicated from the experimental results that for 8 mm-thick AISI 304 s... AISI 304 stainless steel plates were welded with activated flux tungsten inert gas(A-TIG) method by utilizing self-developed activated flux. It is indicated from the experimental results that for 8 mm-thick AISI 304 stainless steel plate, weld joint of full penetration and one-side welding with good weld appearance can be obtained in a single pass without groove preparation by utilizing A-TIG welding. Moreover, activated flux powders do not cause significant effect on the microstructure of TIG weld and the mechanical properties of A-TIG weld joints are also superior to those of C-TIG(conventional TIG) welding. 展开更多
关键词 A-TIG welding activated flux 304 stainless steel full penetration mechanical properties
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Melamine Modification of Spherical Activated Carbon and Its Effects on Acetylene Hydrochlorination 被引量:2
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作者 韩伟杰 WANG Xugen +5 位作者 ZHU Mingyuan ZHANG Haiyang CHEN Kun WANG Qinqin LI Xiaoyan 代斌 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第6期1147-1151,共5页
Commercial spherical activated carbon(SAC) was modified by impregnation to enhance the catalytic properties of SAC in acetylene hydrochlorination through melamine modification. Different modification conditions for ... Commercial spherical activated carbon(SAC) was modified by impregnation to enhance the catalytic properties of SAC in acetylene hydrochlorination through melamine modification. Different modification conditions for SAC with nitrogen were compared by changing the SAC-Melamine ratios. The effect of carbonization temperature on the modification was also investigated. Surface chemistry and adsorption properties of the modified and unmodified SACs were studied by scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS), elementary analysis, BET, and temperature-programmed desorption(TPD). Moreover, the catalytic properties of SAC in acetylene hydrochlorination under differently modified conditions were also investigated. Elemental analysis showed that the nitrogen content of the modified SAC was greatly improved. XPS revealed that nitrogen mainly exists in Pyrrole nitrogen and Pyridine nitrogen. TPD showed that desorption of C2H2 was changed by modification. The conversion rate of acetylene was up to 70% under the following reaction conditions: temperature, 150 ℃; C2H2 hourly space velocity(GHSV), 36 h-1; feed volume ratio V(HCl)/V(C2H2) = 1.15. The catalytic properties of SAC were improved significantly via melamine modification. 展开更多
关键词 spherical activated carbon melamine modification catalytic properties acetylene hydrochlorination
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Role of Ni(NO_3)_2 in the preparation of a magnetic coal-based activated carbon 被引量:18
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作者 ZhangJun Xie Qiang Liu Juan Yang Mingshun Yao Xing 《Mining Science and Technology》 EI CAS 2011年第4期599-603,共5页
The role of Nil(NO3)2 in the preparation of a magnetic activated carbon is reported in this paper. Magnetic coal-based activated carbons (MCAC) were prepared from Taixi anthracite with low ash content in the prese... The role of Nil(NO3)2 in the preparation of a magnetic activated carbon is reported in this paper. Magnetic coal-based activated carbons (MCAC) were prepared from Taixi anthracite with low ash content in the presence of Ni(NO3)2. The MCAC materials were characterized by a vibrating sample magnetometer (VSM), X-ray diffraction (XRD), a scanning electric microscope (SEM), and by N2 adsorption. The cylindri- cal precursors and derived char were also subjected to thermogravimetric analysis to compare their behavior of weight losses during carbonization. The results show that MCAC has a larger surface area (1074 m21g) and a higher pore volume (0.5792 cm3/g) with enhanced mesopore ratio (by about 10~). It also has a high saturation magnetization (1.6749 emu/g) and low coercivity (43.26 Oe), which allows the material to be magnetically separated. The MCAC is easily magnetized because the nickel salt is con- vetted into Ni during carbonization and activation. Metallic Ni has a strong magnetism on account of electrostatic interaction. Added Ni(NO3)2 catalyzes the carbonization and activation process by accelerat- ing burn off of the carbon, which contributes to the development of mesopores and macropores in the activated carbon. 展开更多
关键词 Magnetic coal-based activated carbon Ni(NO3)2 Magnetic properties Pore structure
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Bio-inspired superhydrophobic magnesium alloy surfaces with active anti-corrosion and self-healing properties 被引量:2
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作者 Qiang Li Xudong Zhang +4 位作者 Shuang Ben Zhihong Zhao Yuzhen Ning Kesong Liu Lei Jiang 《Nano Research》 SCIE EI CSCD 2023年第2期3312-3319,共8页
Bio-inspired superhydrophobic magnesium(Mg)alloy surfaces are of increasing interest in corrosion protection due to superior barrier and shielding effects.However,superhydrophobic(SHB)anti-corrosion surfaces are susce... Bio-inspired superhydrophobic magnesium(Mg)alloy surfaces are of increasing interest in corrosion protection due to superior barrier and shielding effects.However,superhydrophobic(SHB)anti-corrosion surfaces are susceptible to damage,which limit their extensive applications.To this end,a micro/nano structure-functional molecule SHB composite coating with self-healing and active anti-corrosion dual-function properties was designed on Mg alloys substrate.The dual-function SHB composite anti-corrosion coating based on lauric acid(La)intercalated and modified hydrotalcite(La-LDH)consisted of three-layer structure,namely La-LDH powder/polydimethylsiloxane(PDMS)/La-LDH film.The anti-corrosion performance of as-prepared coatings was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS).The results indicate that the SHB coating shows excellent active corrosion resistance.Moreover,we also examined the self-healing and anti-corrosion properties of SHB coating upon physical damage and explained the healing mechanism.After heat treatment,the damaged SHB coating regain its surface microstructure and corrosion protection property.This work expands new insights for the wide application of Mg alloys and the research in the field of metal protection. 展开更多
关键词 magnesium alloys anti-corrosion coating SUPERHYDROPHOBIC SELF-HEALING active anti-corrosion property
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Multi-Phase RE(NiAlCu)_x Microcrystalline Hydrogen-Storage Electrode Alloy by Gas-Atomization
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作者 Hou Wanliang Chang Xinchun +2 位作者 Wang Jianqiang Hao Yunyan HuZhuangqi (State Key Lab for RSA,Institute of Metal Research,Shenyang 110015, China), DuWenxin (Suppo Battery Co. Ltd.,Shenyang 110015, China) 《Journal of Rare Earths》 SCIE EI CAS CSCD 1999年第4期315-315,共1页
Microstructure, thermodynamics and electrochemicalproperties of novel RE (NiAlCu)x(x= 4.5, 4.9, 5.6 ) microcrystalline hydrogen-storage alloy powder prepared by gas atomization wasinvestigated. It indicates that alloy... Microstructure, thermodynamics and electrochemicalproperties of novel RE (NiAlCu)x(x= 4.5, 4.9, 5.6 ) microcrystalline hydrogen-storage alloy powder prepared by gas atomization wasinvestigated. It indicates that alloyparticles show relatively regularspherical. Microstructure is composed of the AB5 matrix phase andeutectic double-phase structure withthe AB5 phase and Ni3Al along grainboundaries when x = 5. 6, there is acoexistent structure consisting ofAB5 phase and eutectic doublephase with AB3 and AB phases along grain boundaries at x= 4.5.When x is increased to 4.9, themixed structures are composed ofAB5 and a few AB phases in discontinuous network distribution. Theelectrochemical capacity of alloy is210~300 mAh·g-1, and the activated periods are only 1~3 times.lt seems to be ascribed to the appearance of a great number of freshsurfaces within powder particles resulting from the as-quenched microcrack along the interphase boundaries within particles propagatinggradually in the process of hydrogen-absorption-and dissociation dueto the intrinsic double-phase structure. 展开更多
关键词 Rare earths Gas atomization Microcrystalline hydrogen-storage alloys Multiphase structure Activated properties
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GPCR/endocytosis/ERK signaling/S2R is involved in the regulation of the internalization,mitochondria-targeting and-activating properties of human salivary histatin 1
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作者 Dandan Ma Wei Sun +6 位作者 Cuicui Fu Kamran Nazmi Enno C.I.Veerman Richard T.Jaspers Jan G.M.Bolscher Floris J.Bikker Gang Wu 《International Journal of Oral Science》 SCIE CAS CSCD 2022年第3期334-348,共15页
Human salivary histatin 1(Hst1)exhibits a series of cell-activating properties,such as promoting cell spreading,migration,and metabolic activity.We recently have shown that fluorescently labeled Hst1(F-Hst1)targets an... Human salivary histatin 1(Hst1)exhibits a series of cell-activating properties,such as promoting cell spreading,migration,and metabolic activity.We recently have shown that fluorescently labeled Hst1(F-Hst1)targets and activates mitochondria,presenting an important molecular mechanism.However,its regulating signaling pathways remain to be elucidated.We investigated the influence of specific inhibitors of G protein-coupled receptors(GPCR),endocytosis pathways,extracellular signal-regulated kinases1/2(ERK1/2)signaling,p38 signaling,mitochondrial respiration and Na+/K+-ATPase activity on the uptake,mitochondria-targeting and-activating properties of F-Hst1.We performed a si RNA knockdown(KD)to assess the effect of Sigma-2 receptor(S2R)/Transmembrane Protein 97(TMEM97)—a recently identified target protein of Hst1.We also adopted live cell imaging to monitor the whole intracellular trafficking process of F-Hst1.Our results showed that the inhibition of cellular respiration hindered the internalization of F-Hst1.The inhibitors of GPCR,ERK1/2,phagocytosis,and clathrin-mediated endocytosis(CME)as well as siRNA KD of S2R/TMEM97 significantly reduced the uptake,which was accompanied by the nullification of the promoting effect of F-Hst1 on cell metabolic activity.Only the inhibitor of CME and KD of S2R/TMEM97 significantly compromised the mitochondria-targeting of Hst1.We further showed the intracellular trafficking and targeting process of F-Hst1,in which early endosome plays an important role.Overall,phagocytosis,CME,GPCR,ERK signaling,and S2R/TMEM97 are involved in the internalization of Hst1,while only CME and S2R/TMEM97 are critical for its subcellular targeting.The inhibition of either internalization or mitochondria-targeting of Hst1 could significantly compromise its mitochondria-activating property. 展开更多
关键词 GPCR/endocytosis/ERK signaling/S2R is involved in the regulation of the internalization mitochondria-targeting and activating properties of human salivary histatin 1 ERK
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Effect of activation temperature on the properties of double layer capacitance of diatomite-templated carbon
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作者 LI Aijun CHUAN Xiuyun 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第S1期161-162,共2页
1 Introduction In recent years porous carbons have been widely used in many fields such as energy storage(Mc Creery,2008;Liu et al,2009;Ho et al,2014;Yang et al,2015),adsorption,wastewater treatment,air purification
关键词 AC EDLC Effect of activation temperature on the properties of double layer capacitance of diatomite-templated carbon
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Synthesis,Crystal Structure and Antitumor Activity of Tectochrysin-6-sulfonate
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作者 李午戊 张尊听 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第1期97-104,共8页
In order to enhance water-solubility and biological utilization rate of tectochrysin,sodium 5-hydroxyl-7-methoxyflavone-6-sulfonate(1) was synthesized and its structure was identified on the basis of ^1 H NMR,FT-IR ... In order to enhance water-solubility and biological utilization rate of tectochrysin,sodium 5-hydroxyl-7-methoxyflavone-6-sulfonate(1) was synthesized and its structure was identified on the basis of ^1 H NMR,FT-IR and elemental analysis.5-Hydroxyl-7-methoxyflavone-6-sulfonate was assembled with Ni(II) or Mn(II),hexaquanickel(II) bis(5-hydroxyl-7-methoxyflavone-6-sulfonate) tetrahydrate(2) and hexaquamanganese(II) bis(5-hydroxyl-7-methoxyflavone-6-sulfonate) tetrahydrate(3) were obtained and characterized by IR spectroscopy.The crystal structures of 2 and 3 were determined by X-ray single-crystal diffraction analysis.The results showed that 2 and 3 are isomorphous crystals and crystallize in monoclinic crystal system,space group C2/c.In 2 and 3,the supramolecular structures are organized into hydrophilic and hydrophobic regions.Hydrophilic regions are generated by O–H???O hydrogen bonds among sulfonate groups,latticed water molecules and coordinated water molecules.The π-π stacking interactions assemble the flavone skeletons into columns and these columns form hydrophobic regions.The sulfonate groups play an important role as a bridge of the hydrophilic and hydrophobic regions as well as the inorganic and organic components.Three-dimensional networks of 2 and 3 are furnished by extensive array of hydrogen bonds,π-π stacking interactions and electrostatic interactions.The anti-proliferative activities of 1-3 in vitro against human leukemia cells K562 and human lung cancer cells A549 were evaluated by the standard MTT assay.The pharmacological activity results showed that the introduction of sulfonic acid groups enhanced the antitumor activity of tectochrysin. 展开更多
关键词 5-hydroxyl-7-methoxyflavone-6-sulfonate spectroscopic property crystal structure antitumor activity
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The role of activating reagents on adsorption properties of Anti-hepatitis B surface antigen monoclonal antibody immunoadsorbents
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《Chinese Journal of Biomedical Engineering(English Edition)》 2002年第1期12-14,共3页
关键词 The role of activating reagents on adsorption properties of Anti-hepatitis B surface antigen monoclonal antibody immunoadsorbents
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Anticancer activity and DNA binding property of the trimers of triphenylethylene-coumarin hybrids 被引量:1
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作者 Li Zhang Yu-Chao Yao +4 位作者 Meng-Ying Gao Rui-Xue Rong Ke-Rang Wang Xiao-Liu Li Hua Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第11期1708-1716,共9页
Novel trimers of triphenylethylene-coumarin hybrid containing two amino side chains (5a-d and 6a-d) were designed and synthesized by the condensation of 1,3,5-benzenetricarboxylic acid with the varied amino monomeri... Novel trimers of triphenylethylene-coumarin hybrid containing two amino side chains (5a-d and 6a-d) were designed and synthesized by the condensation of 1,3,5-benzenetricarboxylic acid with the varied amino monomeric hybrids catalyzed by HATU and DIPEA at room temperature. The extended trimeric compound 6a (R = piperidinyl) exhibited significant anti-proliferative activity against three cancer cells at IC5o of near 10 μmol/L. UV-vis, fluorescence (lifetime) and thermal denaturation exhibited that 6a had significant interaction with Ct-DNA by the intercalative mode of binding. The order of their anti- proliferative activities was 6(a, d) 〉 5(a, d) and (5-6)a 〉 (5-6)d, respectively, in accordance with that of their DNA binding properties, which suggested that the prolonged linker (six carbons) and piperidinyl ~roun on the side chains are beneficial to DNA binding and the anti-tumor activity. 展开更多
关键词 Coumarin Triphenylethylene TrimerAnti-tumor activity DNA binding property
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The Gain Properties of 1-D Active Photonic Crystal
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作者 Wang Zhi, Ren Guobin, Lou Shuqin, Pei Li, Jian Shuisheng Institute of lightwave technology, Northern Jiaotong University, Beijing PR China, 100044 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期517-518,共2页
The terminology 'ID frequency'(w ID) is proposed after analyzing the 1D active photonic crystal based on the transfer matrix method. The relationship between wID and the structure parameters of the photonic cr... The terminology 'ID frequency'(w ID) is proposed after analyzing the 1D active photonic crystal based on the transfer matrix method. The relationship between wID and the structure parameters of the photonic crystal is investigated. 展开更多
关键词 of in on BE as is LENGTH The Gain Properties of 1-D active Photonic Crystal
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Characterization of geometry and depleting carrier dependence of active silicon waveguide in tailoring optical properties
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作者 MD REZWANUL HAQUE KHANDOKAR MASUDUZZAMAN BAKAUL +2 位作者 MD ASADUZZAMAN STAN SKAFIDAS THAS NIRMALATHAS 《Photonics Research》 SCIE EI 2017年第4期305-314,共10页
Changes in refractive index and the corresponding changes in the characteristics of an optical waveguide in enabling propagation of light are the basis for many modern silicon photonic devices. Optical properties of t... Changes in refractive index and the corresponding changes in the characteristics of an optical waveguide in enabling propagation of light are the basis for many modern silicon photonic devices. Optical properties of these active nanoscale waveguides are sensitive to the little changes in geometry, external injection/biasing, and doping profiles, and can be crucial in design and manufacturing processes. This paper brings the active silicon waveguide for complete characterization of various distinctive guiding parameters, including perturbation in real and imaginary refractive index, mode loss, group velocity dispersion, and bending loss, which can be instrumental in developing optimal design specifications for various application-centric active silicon waveguides. 展开更多
关键词 RI real Characterization of geometry and depleting carrier dependence of active silicon waveguide in tailoring optical properties
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Evaluation of activated sludge properties’changes in industrial-wastewater pre-treatment:role of residual aluminum hydrolyzed species with different polymerization degree
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作者 Ziqi Zhao Meng Li +2 位作者 Wansong Huang Nuowei Guo Qian Zhang 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第6期141-151,共11页
With the widespread introduction of pre-coagulation prior to the biological unit in various industrial wastewater treatments,it is noteworthy that long-term accumulation of residual coagulants has certains effect on b... With the widespread introduction of pre-coagulation prior to the biological unit in various industrial wastewater treatments,it is noteworthy that long-term accumulation of residual coagulants has certains effect on both micro and macro characteristics of activated sludge(AS).In this study,the morphology distributions of residual aluminum salts(RAS)and their effects on the removal efficiency of AS were investigated under different PAC concentrations.The results showed that the dominance of medium polymeric RAS,formed under an appropriate PAC dose of 20 mg/L enhanced the hydrophobicity,flocculation,and sedimentation performances of AS,as well as the enzymatic activity in cells in the sludge system,improving the main pollutants removal efficiency of the treatment system.Comparatively the species composition with monomer and dimer/high polymer RAS as the overwhelming parts under an over-dosed PAC concentration of 55 mg/L resulted in excessive secretion of EPS with loose flocs structure and conspicuous inhibition of cellular activity,leading to the deterioration of physico-chemical and biological properties of AS.Based on these findings,this study can shed light on the role of the RAS hydrolyzed species distributions,closely relevant to Al dosage,in affecting the comprehensive properties of AS and provide a theoretical reference for coagulants dosage precise control in the pretreatment of industrial wastewater. 展开更多
关键词 Coagulation/flocculation Hydroxyl-aluminum Hydrolysis reaction Reactor performance Activated sludge property Surface properties
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TiO_2-loaded activated carbon fiber:Hydrothermal synthesis,adsorption properties and photo catalytic activity under visible light irradiation 被引量:10
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作者 Hao Meng Wei Hou +2 位作者 Xinxin Xu Junli Xu Xia Zhang 《Particuology》 SCIE EI CAS CSCD 2014年第3期38-43,共6页
TiO2-loaded activated carbon fibers (ACF) were prepared by a hydrothermal method. The samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR... TiO2-loaded activated carbon fibers (ACF) were prepared by a hydrothermal method. The samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectrometry and UV-vis diffuse reflectance spectra (DRS). SEM images showed that the TiO2 nanoparticles were deposited on the surface of ACF, and the particle size and loading amount of TiO2 were varied by changing the initial concentration of tetrabutyl titanate (TBOT). The results of an ash experiment showed that the loading amounts of TiO2 were 18.4%, 43.3%, 52.5%, 75.1%, and 91.1% for initial concentrations of TBOT of 0.07,014, 0.21,0.28, and 0.35 tool/L, respectively, Physical interactions played an important role in the formation of TiO2/ACF composite fibers that absorb UV and visible light. Compared with those of ACF, improved adsorption and photocatalytic activity toward Rhodamine B (RhB) were observed for TiO2/ACF composite fiber. The Rhodamine B could be removed efficiently by TiO2/ACF composite fibers, and the TiO2 loading amount had a significant effect on the photocatalytic activity of TiO2/ACF composite fibers. 展开更多
关键词 Activated carbon fiber (ACF) TiO2 nanoparticles Adsorption property Photocatalytic activity Hydrothermal synthesis
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