Vereinfachte Methode zur Messung von Oberflächengrößen durch Gasadsorption

Haul, R.; Dümbgen, G.

doi:10.1002/cite.330320506

Cited by 96 publications

(8 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We used synthetic barite powder from Sigma Aldrich, which was treated with concentrated nitric acid for 24 h. The N 2 -BET surface area of the treated powder is 2.8 m 2 g Ϫ1 . 18 The inhibitor (2) adsorption was determined from barite suspensions with 0.5 g barite/100 ml. The phosphonate concentration in solution was analysed after extracting the aqueous phase from the suspension after 48 h with a syringe filter (pore size: 0.45 µm).…”

Section: Mechanism Of Inhibition Of Barium Sulfate Crystal Growthmentioning

confidence: 99%

The rational design, synthesis and demonstration of the recognition and binding of a diaza-dioxa-12-crown-4 diphosphonate macrocycle to all crystal growth faces of barium sulfate

Bosbach

Coveney

Griffin

et al. 2002

J. Chem. Soc., Perkin Trans. 2

View full text Add to dashboard Cite

Section: Mechanism Of Inhibition Of Barium Sulfate Crystal Growthmentioning

confidence: 99%

The rational design, synthesis and demonstration of the recognition and binding of a diaza-dioxa-12-crown-4 diphosphonate macrocycle to all crystal growth faces of barium sulfate

Bosbach

Coveney

Griffin

et al. 2002

J. Chem. Soc., Perkin Trans. 2

View full text Add to dashboard Cite

“…For the starting S–DVB copolymers, CMC and SBAE, the average values of the real density, experimentally determined, were as follows: 1.045, 1.133, and 1.173 g/cm 3 , respectively. The specific surface area ( S sp ) was determined by nitrogen adsorption at the boiling temperature of liquid nitrogen by the Haul–Dümbgen method on a Ströhlein Area Meter apparatus 50. The average pore radius was calculated with the following equation (in which the cylindrical shape of pores was assumed): where V p = (1/ρ ap ) − (1/ρ r ), pore total volume, centimeters cubed per gram.…”

Section: Methodsmentioning

confidence: 99%

Ion‐exchange resins. III. Functionalization–morphology correlations in the synthesis of some macroporous, strong basic anion exchangers and uranium‐sorption properties evaluation

Drăgan¹,

Avram²,

Axente

et al. 2004

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

The synthesis and characterization of a series of macroporous, strong basic anion exchangers (SBAEs), with an average pore radius higher than 50 nm, and the evaluation of their sorption properties for uranyl chlorocomplexes from HCl solutions are reported. Finely divided macroporous styrene–divinylbenzene (S–DVB) copolymers with a narrow distribution of beads sizes, diameters within the range of 90–200 μm, were prepared for this purpose with 2‐ethyl‐1‐hexanol as a porogen, at a high dilution of monomers (D ≥ 0.55 mL/mL). Chloromethyl groups were introduced with (CH2O)n/Me3SiCl as a chloromethylation agent in the presence of a Lewis acid as a catalyst (TiCl4, SnCl4, and FeCl3) in CHCl3 as a reaction medium. SnCl4 and FeCl3 gave comparable chloromethylation degrees in the same reaction conditions. TiCl4 was not efficient as a catalyst in the chloromethylation with this reagent. Diethyl‐2‐hydroxyethylamine was used as a tertiary amine to prepare SBAEs. Structural and morphological characteristics were determined after every functionalization step of the macroporous network. Both the chloromethylation, in the presence of FeCl3 as a catalyst, and the amination reactions determined a significant decrease of the pore volume, in the whole range of the nominal crosslinking degree, comparative with the starting copolymer. The specific surface area and the average pore radius varied in a different way as a function of the nominal crosslinking degree. Thus, the specific surface area increased and the average pore radius decreased after chloromethylation and amination for copolymers with a DVB content lower than 10 wt %. Small decreases of the specific surface area and the average pore radius were observed after chloromethylation and amination reactions for copolymers with a DVB content higher than 10 wt %. SBAEs were also characterized by thermogravimetric analysis and sorption capacity for uranyl chlorocomplexes. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2451–2461, 2004

show abstract

“…The specific density (ρ sp ) was measured in n ‐heptane. The surface area was determined by the nitrogen adsorption at the boiling temperature of liquid nitrogen, by the Haul–Dümbgen method on a Ströhlein area meter apparatus (Germany) 28, 29. The mean pore radius was calculated using the following equation, with pores of cylindrical shape assumed: where V p = (1/ρ ap ) − (1/ρ sp ) is the pore total volume (cm 3 /g).…”

Section: Methodsmentioning

confidence: 99%

Organic–inorganic polymer hybrids and porous materials obtained on their basis

Cazacu¹,

Drăgan²,

Vlad³

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

Tetramethoxysilane (TMOS) or tetraethoxysilane (TEOS), an organic monomer [methylmethacrylate (MMA) or styrene (St)] and either ␣-propylmethacryloxy--trimethylsiloxy-oligo(dimethylsiloxane) (OMS), as a compatibilizing agent, or ␣,-bis(vinyl) oligo(dimethylsiloxane) (OVS), as compatibilizing and crosslinking agent, were allowed to undergo a sol-gel reaction under acidic condition and in the presence of 2,2Ј-azoisobutyronitrile (AIBN) as a free-radical initiator. The hydrolysis-condensation and in situ free-radical polymerization occur independently, to give a hybrid consisting of both inorganic and organic components. The conversion of the monomers to the proper polymers was monitored by IR spectroscopy and TGA. The resistance of the organic polymers to solvent extraction was also studied. The hybrids were pyrolyzed in an oxidative atmosphere. By decomposition, the organic polymer generated pores in the inorganic matrix. A quantitative evaluation of the characteristics for the resulting porous material was made by determination of the specific area, pore volume, and average radius.

show abstract

Vereinfachte Methode zur Messung von Oberflächengrößen durch Gasadsorption

Abstract: t.rJtD, um eine ubereinstimmende Standard-Abweichung o zu erreichen; es verbessert sich beim Tetraeder-Mischer mit fortschreitender Mischung, weil a c o~ < ow^ ist. Dieses Zeitverhaltnis betragt nach unseren Versuchen (Tab. 1) AdA, = 0,63.Chemie-Ing.-Tecfin. 32. Jahrg. 1960 / Nr 5

Cited by 96 publications

References 9 publications

The rational design, synthesis and demonstration of the recognition and binding of a diaza-dioxa-12-crown-4 diphosphonate macrocycle to all crystal growth faces of barium sulfate

The rational design, synthesis and demonstration of the recognition and binding of a diaza-dioxa-12-crown-4 diphosphonate macrocycle to all crystal growth faces of barium sulfate

Ion‐exchange resins. III. Functionalization–morphology correlations in the synthesis of some macroporous, strong basic anion exchangers and uranium‐sorption properties evaluation

Organic–inorganic polymer hybrids and porous materials obtained on their basis

Contact Info

Product

Resources

About