AFM characterization of the growth of MFI-type zeolite films on alumina substrates

Vilaseca, M.; Mateo, Ester; Palacio, Laura; Prádanos, Pedro; Hernández, Antonio; Paniagua, A.; Coronas, Joaquı́n; Santamarı́a, Jesús

doi:10.1016/j.micromeso.2004.03.020

Cited by 22 publications

(9 citation statements)

References 27 publications

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“…7a) and double‐stage in situ (Fig. 7b) corroborated to the b ‐orientation of the crystals in the film 15,21 . In case of ex situ crystal growth process, the appearance of peak of ( hkl ) values (101)/(011) along with the peak of the ( hkl ) value of (200)/(020) indicated that the crystals were not only b ‐oriented, but a ‐ and c ‐oriented, that is random orientation 15 of the crystals.…”

Section: Resultssupporting

confidence: 52%

“…7b) corroborated to the b-orientation of the crystals in the film. 15,21 In case of ex situ crystal growth process, the appearance of peak of (hkl) values (101)/(011) along with the peak of the (hkl) value of (200)/(020) indicated that the crystals were not only b-oriented, but a-and c-oriented, that is random orientation 15 of the crystals. Figure 8 shows the SEM images of silicalite-1 film grown hydrothermally through in situ (single-stage) crystallization on the porous ceramic support at (a) 1301C, (b) 1501C, and (c) 1701C for 5 h each.…”

Section: Resultsmentioning

confidence: 99%

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Understanding the Role of Process Parameters on the Preparation of Silicalite-1 Zeolite Seed Crystals and Thin Films

Naskar

Kundu

Chatterjee

2011

International Journal of Applied Ceramic Technology

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Silicalite‐1 zeolite seed crystals were prepared by a hydrothermal technique under different experimental conditions. The thin films of silicalite‐1 were developed on the porous ceramic substrate by (i) single‐stage in situ, (ii) double‐stage in situ, and (iii) ex situ (secondary) crystal growth processes. The prepared seed crystals and films were characterized by X‐ray diffraction (XRD) and scanning electron microscopy. The XRD study showed that the crystallization of silicalite‐1 seeds increased with the increasing temperature and processing time and with the decreasing water content of the precursor materials. The twin‐free, pill‐shaped silicalite‐1 seed crystals were made in a shorter duration that is 5 h at 130°C. The thin film of silicalite‐1 prepared on the porous ceramic substrate by single‐stage and double‐stage in situ processes showed a b‐oriented crystal arrangement. However, ex situ (secondary) crystal growth process rendered a random orientation of crystals. The silicalite‐1 films with double‐stage in situ crystal growth process showed the permeances of 12 × 10−7 and 32 × 10−7 mol/m2/s/Pa for single gas N2 and O2, respectively, with their ideal selectively (O2/N2) of 2.66 at room temperature (30°C) and a transmembrane pressure of 1.5 bar.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Understanding the Role of Process Parameters on the Preparation of Silicalite-1 Zeolite Seed Crystals and Thin Films

Naskar

Kundu

Chatterjee

2011

International Journal of Applied Ceramic Technology

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“…That is why AFM has a lot of applications [13], such as analyzing ionic crystals, DNA and RNA [14,15], and red blood cells [16]. AFM has also been used to study the roughness of polymeric [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] and ceramic membranes [32,33]. For ultrafiltration and microfiltration membranes AFM can be used not only to measure the roughness, but also to study the size and the shape of pores on the surface [18-20,23-25, 27,29,30].…”

Section: Introductionmentioning

confidence: 99%

Roughness and hydrophobicity studies of nanofiltration membranes using different modes of AFM

Boussu

Bruggen

Volodin

et al. 2005

Journal of Colloid and Interface Science

273

131

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Determination of the surface roughness by AFM is crucial to the study of particle fouling in nanofiltration. It is, however, very difficult to compare the different roughness values reported in the literature because of a lack in uniformity in the methods applied to determine surface roughness. AFM is used in both noncontact mode and tapping mode; moreover, the size of the scan area is highly variable. This study compares, for six different nanofiltration membranes (UTC-20, N30F, Desal 51HL, Desal 5DL, NTR7450, NF-PES-10), noncontact mode AFM with tapping mode AFM for several sizes of the scan area. Although the absolute roughness values are different for noncontact AFM and tapping mode AFM, no difference is found between the two modes of AFM in ranking the nanofiltration membranes with respect to their surface roughness. NTR 7450 and NF-PES-10 are the smoothest membranes, while the roughest surface can be found with Desal 51HL and Desal 5DL. UTC-20 and N30F are characterized by an intermediate roughness value. An increase in roughness with increasing scan area is observed for both AFM modes. Larger differences between the roughnesses of the membranes are obtained with tapping mode AFM because of the tapping of the tip on the surface. Phase imaging is an extension of tapping mode AFM, measuring the phase shift between the cantilever oscillation and the oscillation of the piezo driver. This phase shift reflects the interaction between the cantilever and the membrane surface. A comparison with contact angle measurements proves that a small phase shift corresponds to a large contact angle, representing a hydrophobic membrane surface.

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“…On the one hand, one-step techniques referred to as direct in situ crystallization are applied. Thereby, the surface of the untreated either tubular or disc support is brought in a direct contact with an aluminosilicate precursor solution and the membrane crystallization is performed under hydrothermal conditions as shown exemplarily in the following references [49][50][51][52][53][54][55]. Alternatively, Caro et al proposed a seeding-free synthesis strategy for the preparation of dense and phase-pure zeolite LTA and FAU membranes using 3-aminopropyltriethoxysilane (APTES) as covalent linker between the zeolite layer and the alumina support [56,57].…”

Section: Synthesis Of Zeolite Membranesmentioning

confidence: 99%

Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings

Dragomirova

Wohlrab

2015

Catalysts

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Literature on zeolite membranes in catalytic reactions is reviewed and categorized according to membrane location. From this perspective, the classification is as follows: (i) membranes spatially decoupled from the reaction zone; (ii) packed bed membrane reactors; (iii) catalytic membrane reactors and (iv) zeolite capsuled catalyst particles. Each of the resulting four chapters is subdivided by the kind of reactions performed. Over the whole sum of references, the advantage of zeolite membranes in catalytic reactions in terms of conversion, selectivity or yield is evident. Furthermore, zeolite membrane preparation, separation principles as well as basic considerations on membrane reactors are discussed.

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AFM characterization of the growth of MFI-type zeolite films on alumina substrates

Cited by 22 publications

References 27 publications

Understanding the Role of Process Parameters on the Preparation of Silicalite-1 Zeolite Seed Crystals and Thin Films

Understanding the Role of Process Parameters on the Preparation of Silicalite-1 Zeolite Seed Crystals and Thin Films

Roughness and hydrophobicity studies of nanofiltration membranes using different modes of AFM

Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings

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