摘要:

Ti-MCM-48 mesoporous materials have been synthesized by sequential addition of alkoxides. The atomic ratio of Si and Ti in the synthesis gel was 40 and 5, respectively. The materials were characterized by means of powder XRD, N2adsorption-desorption measurements, HREM,29Si MAS NMR, diffuse reflectance FT-IR spectroscopy, electrophoretic mobility measurements and electron probe microanalysis.

ISSN:0193-2691    

DOI:10.1080/01932690008913264

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Water-in-oil emulsions are investigated by means of multivariate analysis of near infrared (NIR) spectroscopic profiles in the range 1100 — 2250 nm. The oil phase is a paraffin-diluted crude oil from the Norwegian Continental Shelf. The influence of water absorption and light scattering of the water droplets are shown to be strong. Despite the strong influence of the water phase, the NIR technique is still capable of predicting the composition of the investigated oil phase.

ISSN:0193-2691    

DOI:10.1080/01932690008913265

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Structured fluids such as emulsions and liquid crystalline mesophases can be used to control aroma release

ISSN:0193-2691    

DOI:10.1080/01932690008913266

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Interaction between dye (ECAB), nonionic surfactant (TX-100) micelle in aqueous solution and TX-100 hemimicelie at solid (SiO2)/liquid interface has been investigated quantitatively. There are linear relationships between concentrations of free ECAB(Ca), ECAB bound with TX-100 micelles in solution(Cm) and ECAB bound with TX-100 hemimicelles at interface of solid/liquid(Chm). The slopes of the three straight lines are 0.32 for Chm∼Ca-1.32 for Cm∼Caand -1.00 for (Cm+Chm∼Carespectively. The linear relationships can be described by three linear equations as follows: Chm=0.32 (Ca−O.88×10−5),Cm.=4.0×10−5-l.33 Caand Chm+Cm=3.742×l0−5-Ca,. It is inferred that the interaction between ECAB, TX-100 micelles and TX-100 hemimicelles is essentially partition of ECAB molecules in solution, TX-100 micelles and hemimicelles. The concentration of ECAB bound with TX-100 micelles well as electronic repulsion. Additionally, A quantitative method to determine adsorbance of surfactant TX-100 on silica gel by spectroscopy in coadsorption conditions of dye (ECAB) and TX-100 was proposed.

ISSN:0193-2691    

DOI:10.1080/01932690008913267

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

An experimental study on determination of alkaline, surfactant, polymer (ASP) flooding systems using natural mixed carboxylate was conducted to examine the decisive factor for ASP flooding, phase behavior or interfacial tension. The volume and color of middle phase liquid were observed, the transient interfacial tension at different salt and alkaline concentrations were measured and, finally, coreflood test in laboratory were made. The results showed the flooding system with larger volume and brown color of middle phase emulsion sometimes not to obtain better oil recovery efficiency. The primary and more important phenomenon affecting the oil recovery is a lower or ultralow minimum interfacial tension value at the crude oil/soluble phase interface.

ISSN:0193-2691    

DOI:10.1080/01932690008913268

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The middle phase microemulsion of Sodium Dodecylsulfonate / 2-Phenyloxyethanol / heptane / Brine was studied at optimal salinity. The fact that structure nonhomogeneity develops upon standing was revealed by cryo-TEM, polarizing microscopy and small angle X-ray diffraction. The structural complexity in this middle phase microemulsion is demonstrated and the cause of structure transformation from spherical micelles to thread-like ones, then to vesicles and to lamellar phase was analyzed using a concentration gradient of surfactant and cosurfactant in the middle phase microemulsion. This experiment also shows the advantages of this new cryo-TEM method.

ISSN:0193-2691    

DOI:10.1080/01932690008913269

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A heterodyne laser Doppler electrophoresis method for measuring the zeta potential of a surfactant micelle has been developed. Details of the method and results obtained will be presented in this paper. In comparison with the tracer electrophoresis method used in determining the zeta potential of a surfactant micelle, this method is much time saving and less laborious. The zeta potential values of one anionic and three cationic surfactant micelles have been determined by using this method. From the zeta potential versus concentration curve, one can determine the micellar dissociation concentration and the critical mi cellar concentration of a surfactant. The values obtained agree quite well with the surface tension measurement. The surfactant systems were studied in the presence and absence of NaCI. The zeta potential appears to decrease with the increase of NaCI concentration.

ISSN:0193-2691    

DOI:10.1080/01932690008913270

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The phase diagram of a isopropyl myristate (IPM), water, leckhin/decyl polyglucoside (1:1), butanol mixture was constructed and the region of the o/w microemulsion was examinated. The realm of existence of this system was also investigated employing eight different, linear and branched short-chained alcohols as cosurfactants. The alcohol contribute to the extention of the microemulsion domain was explained in terms of lipophilicity and solubility. Moreover, the role of the cosurfactant was examined in a relationship study where the amount required to form the microemulsion of a series of twenty alcohols was related to a set of new structural descriptors of these molecules, the WHIM indices.

ISSN:0193-2691    

DOI:10.1080/01932690008913271

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

2000

ISSN:0193-2691    

DOI:10.1080/01932690008913272

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor