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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.


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

The interaction of cationic gemini surfactant 1,2-ethane-bis-[N,N,N- dimethyl-(Z-13-docosenyl)quaternary ammonium bromide] (hereafter noted 22-2-22) with gelatin above its isoelectric point were studied by pH measurements, viscosity and fluorescence spectroscopy. It has been found that three critical concentrations of 22-2-22, referred to as Cinter, Cintra and Ca respectively, can be detected by steady state fluorescence measurements. However, only Cintra can be noted effectively by viscosity measurement. The experimental results indicate that the polymer bound micelles act as transient cross-links resulting in the inter-polymer or intra-polymer association, which is depending on both surfactant and gelatin concentrations. When C22-2-22 Cinter micelles bound to more than one polymer strand act as transient crosslinks between gelatin molecules, that is, inter-molecular association. As C22-2-22 is greater than Cintra, more surfactant micelles tend progressively to envelop and "neutralize" the binding sites of polymer chains and break the inter-chain junctions. And relatively rich surfactant micelles made each gelatin strand accommodate surfactant micelle which bind with several sites of the same polymer chain, i.e., the intra-polymer association occurs. Finally one gelatin chain may bind several surfactant micelles. However if Cgelatin reaches the overlap concentration Cthe intra-polymer association may be screened by the entanglement of polymer chains.


Ren Q.,Anhui University of Architecture | Ren Q.,Anhui Key Laboratory of Advanced Building Materials | Ding Y.,Anhui University of Architecture | Ding Y.,Anhui Key Laboratory of Advanced Building Materials | And 4 more authors.
Asian Journal of Chemistry | Year: 2012

By using orthogonal test, flexure strength and volume density as mostly performance index, by means of SEM and XRD, the glassceramic of the sintering and crystallization are investigated. The optimal parameters for the heat treatment of the glass is that the glass should be heated to 770 °C, holding for 1h, then heated to 875 °C, holding for 3 h. The crystallization temperature is the most important to the mechanical property of the glass-ceramics and holding time for nucleation is least. The main crystal phase is wollastonite by JSPDC cards and the crystal morphology of No. 4 is complete by SEM.


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.


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.


Bin T.,Anhui Key Laboratory of Advanced Building Materials | Zheng G.,Anhui Institute of Architecture and Industry | Zheng L.,Anhui Key Laboratory of Advanced Building Materials | Jin L.,Anhui Key Laboratory of Advanced Building Materials
Advanced Materials Research | Year: 2011

Based on the different feed-ratios to the concentrations of initiator((NH 4) 2S 2O 8), acrylic acid, acrylamide and prevent-polymerization agent (isopropyl), this article discusses the inherent viscosity of the polymeric soil consolidator and the test of hardening performance. Experiment results indicate that: 1) the relationships between different feed-ratios and inherent viscosity are as the following: with the increase of initiator charging quantities, the sample's inherent viscosity rises, while with the increase of acrylamide charging quantities, the sample's inherent viscosity decreases. When the charging quantity of isopropyl is 6.750 g, the sample's inherent viscosity reaches the max value 32.47 ml·g -1. 2) The addition of polymeric soil consolidator into the soil can improve the performance such as the resilient modulus and california bearing ratio significantly. © (2011) Trans Tech Publications.


Hu G.,Anhui University of Architecture | Liu J.,Anhui University of Architecture | Liu J.,Anhui Key Laboratory of Advanced Building Materials | Li Z.,Anhui University of Architecture
Asian Journal of Chemistry | Year: 2011

The water-borne linear polyester-ether-urethane with alternating polyester and polyether as soft segment was synthesized by pre-polymerization and blocking reaction. The chemical structure of polyester-ether-urethane was characterized by FTIR and was proved no chemical crosslinking by dissolution experiments of N,N-dimethylformamide. The water dispersion and solubilization were analyzed by solid content, emulsion stability, surface tension and viscosity of hybrid latex. The results showed that the emulsion of polyester-etherurethane with methyl diphenylene diisocyanate as hard block was the most stable and its maximum solid content was 6.5 %, the surface tension of water was reduced obviously by the polyester-ether-urethane emulsion, when the mass per cent of the polyester-ether-urethane, emulsion and the emulsion of polyester-urethane admixture was 8 %, polyether-urethane and polyester-urethane mass ratio of 1:1.


Zhou K.,Anhui University of Architecture | Liu J.,Anhui University of Architecture | Liu J.,Anhui Key Laboratory of Advanced Building Materials | Li Z.,Anhui University of Architecture
Asian Journal of Chemistry | Year: 2011

The novel polycarboxylate superplasticizers (NPCS) were prepared by copolymerizing of novel maleic anhydride citric acid ester (MACA), methoxyl polyethylene glycol ether methyl acrylate (MPEGMAA), acrylic acid (AA), a-methylacrylic acid (MAA), sodium alkyl sulfonate (SAS). The structure and properties of novel polycarboxylate superplasticizers were characterized by FTIR, intrinsic viscosity and surface tension. Moreover, the application properties of the fluidity, zeta potential and drying shrinkage of adding novel polycarboxylate superplasticizers into cement paste were also investigated. The results showed that the fluidity of cement grout reached as high as 360 mm at the copolymer usage of 0.25 wt %, water-cement ratio of 0.29. No obvious loss of fluidity occurred within 2 h and the cement paste without bleeding and segregation was homogeneous. In addition, the novel polycarboxylate superplasticizer is good for reducing the drying shrinking, improving the mesoporous volume and making cement hardenite more compact by proved from N2 adsorption and desorption measurement.

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