Adsorption of toluene-heptane mixtures on silica gels and carbon blacks

Koselev, A. V.; Khopina, V. V.; Эльтеков, Ю. А.

doi:10.1007/bf00917269

Cited by 7 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Kelvin equation relates the size of a filled pore to the partial pressure and physical properties of an adsorbing gas as where p is the vapor pressure, p 0 is the saturated vapor pressure, γ is the surface tension of the adsorbing specie, V m is the adsorbate molar volume in the condensed state, r k is the Kelvin radius, R is the gas constant, and T is the temperature. The thickness of the adsorbed toluene layer t is based upon the published adsorbed thickness on nonporous silica as 32 where d 0 is the thickness of a toluene monolayer on silica (0.37 nm) …”

Section: Resultsmentioning

confidence: 99%

“…The thickness of the adsorbed toluene layer t is based upon the published adsorbed thickness on nonporous silica as 32 where d 0 is the thickness of a toluene monolayer on silica (0.37 nm). 43 C is the BET constant C ) exp[(q 1 -q L )/RT], where q 1 and q L are the heat of adsorption in the first monolayer and the molar heat of condensation. 44 C is estimated to be 289.1 on the basis of published heats of adsorption and condensation.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Tuning Mechanical Properties of Mesoporous Silicas Using Associating Homopolymers/Block Copolymer Blends as Templates

Song

Vogt

2007

J. Phys. Chem. C

View full text Add to dashboard Cite

Ordered mesoporous films are synthesized from the vapor-phase condensation of tetraethyl orthosilicate within preformed amphiphilic template films consisting of a blend of poly(ethylene oxide)-b-poly(propylene oxide)b-poly(ethylene oxide) (Pluronic F127) and poly(4-hydroxystyrene) (PHOSt). By modification of the Pluronic F127:PHOSt ratio in the template film, the long range order of the synthesized mesoporous silica can be tuned with the largest grains observed at approximately 15 wt % PHOSt. This increase in ordering and orientation of the mesopores is accompanied by a narrowing of the pore size distribution, a slight increase in the average mesopore radius, and a substantial increase in the Young's modulus of the film. Deviations from this 15 wt % PHOSt composition to higher or lower PHOSt loadings result in a decay in the long range ordering and subsequently a decrease in the film modulus. The modulation in the mechanical properties through modification in the PHOSt concentration (1-50 wt %) is nearly 1 order of magnitude without significantly altering the porosity. Moreover, samples with nearly indistinguishable morphology as determined through TEM micrographs can exhibit a difference in modulus by a factor of 3. This work demonstrates the importance of long range order for fabricating mechanically robust porous films.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tuning Mechanical Properties of Mesoporous Silicas Using Associating Homopolymers/Block Copolymer Blends as Templates

Song

Vogt

2007

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…On the other hand, TMB would also preferentially locate around the headgroup of CTAB micelles, the surface of the magnetic seeds, as well as the silica species by a P-cation [34] and P-silanol interactions [35], respectively. As illustrated in Scheme 1b, these types of TMB localization induce decreased polarity of the interface of the micelles and magnetic seeds and further cause conglutination or aggregation of particles, as the repulsion forces among species (like magnetic cores) was diminished as a consequence of decreased systematic polarity [36].…”

Section: Discussionmentioning

confidence: 99%

Synthesis and characterization of pore size-tunable magnetic mesoporous silica nanoparticles

Zhang

Rosenholm

et al. 2011

Journal of Colloid and Interface Science

157

View full text Add to dashboard Cite

“…The transport of species through the PV membranes involves three steps in series: (A) selective sorption into the membrane, (B) diffusion through the membrane, and (C) desorption into the vapor phase. The mass transport rate of overall process is functions of solubility and diffusivity, since the desorption step is fast due to the efficient vacuum [11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Modeling of Organic Mixtures Separation in Dense Membranes Using Finite Element Method (FEM).

Marjani¹,

Shirazian²

2012

Orientjchem.

View full text Add to dashboard Cite

A comprehensive mathematical model was developed to predict separation of organic mixtures using dense polymeric membranes. The organic mixture considered in this study was toluene and n-heptane mixture. The separation process was pervaporation (PV) which utilizes a dense membrane for separation. Conservation equations including continuity and energy transfers were solved numerically. Computational fluid dynamics (CFD) technique was used to solve the model equations. The toluene mole fraction and temperature profile were determined. The simulation results confirmed that the developed model can provide a general simulation for separation of organic mixtures using pervaporation.

show abstract

Adsorption of toluene-heptane mixtures on silica gels and carbon blacks

Cited by 7 publications

References 6 publications

Tuning Mechanical Properties of Mesoporous Silicas Using Associating Homopolymers/Block Copolymer Blends as Templates

Tuning Mechanical Properties of Mesoporous Silicas Using Associating Homopolymers/Block Copolymer Blends as Templates

Synthesis and characterization of pore size-tunable magnetic mesoporous silica nanoparticles

Modeling of Organic Mixtures Separation in Dense Membranes Using Finite Element Method (FEM).

Contact Info

Product

Resources

About