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Chen X.-M.,Anhui University of Architecture | Chen X.-M.,Anhui Key Laboratory of Advanced Building Materials
Chinese Journal of Chemical Physics | Year: 2011

Cetyltrimethylammonium bromide (CTAB)/potassium bromide (KBr) micellar system has been used as a viscosity probe to study the inclusion complexation between β-cyclodextrin (β-CD) and CTAB. Viscosity measurements show that the inclusion complexation between β-CD and CTAB may cause the breakdown of CTAB/KBr wormlike micelles, resulting in the decrease of the solution viscosity. The viscosity minimum at Cβ-CD/C CTAB=2 indicate the molecular ratio of host molecule to guest molecule is 2:1 in the β-CD/CTAB inclusion complex. © 2011 Chinese Physical Society.


Deng C.,Hefei University | Hu H.,Anhui University of Architecture | Hu H.,Anhui Key Laboratory of Advanced Building Materials | Ge X.,Hefei University | And 3 more authors.
Ultrasonics Sonochemistry | Year: 2011

Hierarchical hollow CuO submicrospheres have been fabricated on a large scale by a facile one-pot sonochemical process in the absence of surfactants and additives. The as-prepared products were investigated by XRD, FESEM, EDX, TEM, SAED, HRTEM and BET nitrogen adsorption-desorption isotherms. The results reveal that hollow pumpkin-shaped structures possess a monoclinic phase CuO with the diameters ranging from 400 to 500 nm, and their walls with around 45 nm in thickness are composed of numerous single crystalline CuO nanoribbons with a width of about 8 nm. The BET specific surface area of the as-synthesized CuO hollow structures was measured to be 59.60 m2/g, and the single point adsorption total pore volume was measured to be 0.1036 cm3/g. A possible growth mechanism for the formation of hierarchical hollow CuO structures was proposed, which is considered to be a sonohydrolysis - oriented aggregation - Ostwald ripening process. The novel hollow CuO spherical structures may utilize applications in biosensors, photonics, electronics, and catalysts. © 2011 Elsevier B.V. All rights reserved.


Chen X.,Anhui University of Architecture | Chen X.,Anhui Key Laboratory of Advanced Building Materials | Ren L.,Anhui University of Architecture
Asian Journal of Chemistry | Year: 2013

In mixed solutions of poly(ethylene glycol) and sodium dodecyl sulphate the aggregation of surfactants with polymer chains strengthens the intermolecular or/and intramolecular hydrophobic junctions, resulting in the intermolecular or/and intramolecular association of poly(ethylene glycol) mediated by sodium dodecyl sulphate. If the polymer concentration c > 0.017 g/mL different polymer chains associate together through intermolecular hydrophobic junctions. The reduced viscosity of poly(ethylene glycol) increases as the concentration of sodium dodecyl sulphate increases. On the other hand, if c < 0.017 g/mL, the poly(ethylene glycol) chains are almost separated and the intramolecular association of poly(ethylene glycol) through intramolecular hydrophobic junctions dominates. Therefore the reduced viscosity of poly(ethylene glycol) decreases considerably as the concentration of sodium dodecyl sulphate increases. Copyright © 2013 Asian Journal of Chemistry.


Chen X.,Anhui University of Architecture | Chen X.,Anhui Key Laboratory of Advanced Building Materials | Ren L.,Anhui University of Architecture
Asian Journal of Chemistry | Year: 2013

Poly(vinyl pyrrolidone)/sodium dodecyl sulfate complex was applied as a probe to study the effect of benzyl alcohol on micellization behaviour of sodium dodecyl sulfate. It has been found that a critical concentration (cs), exists in the relative viscosity versus benzyl alcohol concentration plot. As the benzyl alcohol concentration is less than (cs) the relative viscosity of solution containing poly(vinyl pyrrolidone)/sodium dodecyl sulfate complex increased by adding benzyl alcohol into solution successively. On the other hand, as the benzyl alcohol concentration is greater than cs, the relative viscosity of solution containing poly(vinyl pyrrolidone)/sodium dodecyl sulfate complex decreased by adding benzyl alcohol into solution. The increase and the decrease of the relative viscosity of solution containing poly(vinyl pyrrolidone)/sodium dodecyl sulfate complex in the presence of benzyl alcohol is just due to the cosurfactant and the cosolvent effect on micellization behaviour of sodium dodecyl sulfate in aqueous solution. Further experimental results indicate that cs is dependent on both sodium dodecyl sulfate and Poly(vinyl pyrrolidone) concentration.


Liu J.,Anhui University of Architecture | Liu J.,Anhui Key Laboratory of Advanced Building Materials | Deng D.,Anhui University of Architecture | Zhao F.-N.,Anhui University of Architecture | Lin Q.-W.,Anhui University of Architecture
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

Nickel-doped carbon molecular sieves (CMS) with controlled particle size have been prepared by the method of inverse suspension polymerization to synthesize poly(furfuryl alcohol) with nickel nitrate as carbon precursor, utilizing template porous nanosilica, through a mild carbonization and post-treatment process. The preparation mechanism and micro-structure of CMS have been characterized through XRD, SEM, N2 adsorption, FT-IR and TGA. The results show that the different carbonization conditions have a definite effect on the particle size and distribution of CMS, additionally, when the carbonization temperature from 650°C up to 700°C, the mesopore volume and the total pore volume raised to 0.40 and 0.67cm3/g, respectively. The micropore volume has expanded twice with the carbonization heating rate increased. The XRD and AAS analysis proved that nickel have been doped into CMS by ratio of 2.24wt% successfully.

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