Relation of water adsorption capacities of zeolites with their structural properties

Tatlıer, Melkon; Munz, Gunther; Henninger, Stefan K.

doi:10.1016/j.micromeso.2017.12.031

Cited by 75 publications

(33 citation statements)

References 30 publications

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“…These results can be explained from the perspective of nucleation. The movement of the iPP chains were induced by the addition of the nucleating agent NA11 so that a partial crystalline phase was initially formed to promote crystallization of the subsequent iPP molecules, accelerating the whole crystallization process . The dispersion of the nucleating agent NA11 was promoted by Z4A, providing more nucleation sites and therefore reducing the activation energy.…”

Section: Resultsmentioning

confidence: 99%

“…induced by the addition of the nucleating agent NA11 so that a partial crystalline phase was initially formed to promote crystallization of the subsequent iPP molecules, accelerating the whole crystallization process. 17,23,26 The dispersion of the nucleating agent NA11 was promoted by Z4A, providing more nucleation sites and therefore reducing the activation energy. Furthermore, the low activation energy value of −280.3 kJ/mol obtained for NA11-Z4A/iPP indicates that the effect of NA11-Z4A on the improvement in the nucleation process if iPP is much stronger than those of NA 11 alone and NA11/Z4A.…”

Section: Nonisothermal Crystallization Kineticsmentioning

confidence: 99%

“…Zeolites with highly ordered pores and cavity systems have been used as supports of catalysts . It may be used as the dispersion supports of nucleating agents.…”

Section: Introductionmentioning

confidence: 99%

“…Zeolites with highly ordered pores and cavity systems have been used as supports of catalysts. [13][14][15][16][17][18][19][20][21] It may be used as the dispersion supports of nucleating agents. Several researchers investigated the significant effects of zeolite particles on the crystallization behavior of PP as a filler.…”

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confidence: 99%

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Effect of nucleating agent supported on zeolite via the impregnation on the crystallization ability of isotactic polypropylene and its mechanism

Tong

Meng

et al. 2019

Polymers for Advanced Techs

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Addition of an α‐nucleating agent is the simple and effective method to increase nucleation efficiency of isotactic polypropylene (iPP). However, severe agglomeration and poor dispersibility of sodium 2,2′‐methylene‐bis(4,6‐di‐tertbutylphenyl) phosphate (NA11) decrease the nucleation efficiency in the iPP, and much more nucleating agent is needed to maintain the nucleating property. As a result, it becomes the key how to decrease the size of NA11 and increase the nucleating property. In this paper, zeolite 4A (Z4A) was firstly supported by NA11 through solution impregnation, and NA11 was dispersed by Z4A depending on the dispersion of zeolite as carrier for the second component. Then, the dispersed NA11 system (NA11‐Z4A) exhibited a superior nucleation behavior during the crystallization of the iPP matrix when it was used with iPP together. The isothermal and nonisothermal crystallization kinetics indicated that the NA11‐Z4A/iPP system had the best crystallization effect. Polarized optical microscopy (POM) and scanning electron microscopy (SEM) analyses showed that the size of NA11 decreased obviously when it was adsorbed on the surface of Z4A, which leads a better dispersibility of the nucleating agent and thus an accelerated nucleation process in the iPP matrix. In the end, the mechanism for the excellent dispersibility of NA11‐Z4A, which was based on hydrogen bonding between NA11 and Z4A, was confirmed by Fourier‐transform infrared spectroscopy (FTIR). Based on the research work, the solution impregnation strategy can potentially be applied to other systems to inhibit the agglomeration and improve the dispersibility of additives in iPP.

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Section: Resultsmentioning

confidence: 99%

Section: Nonisothermal Crystallization Kineticsmentioning

confidence: 99%

“…Zeolites with highly ordered pores and cavity systems have been used as supports of catalysts . It may be used as the dispersion supports of nucleating agents.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of nucleating agent supported on zeolite via the impregnation on the crystallization ability of isotactic polypropylene and its mechanism

Tong

Meng

et al. 2019

Polymers for Advanced Techs

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“…Water intrusion-extrusion capacity [mm 2 g À1 ] PSS-2 1000 Pure silicaITQ-7 [46] 210 Pure silicaL TA [48] 170 Pure silicaBEA [52] 140 IFR [51] 136 MTW [50] 114 AFR [53] 390 AEI [53] 370 ZIF-8 [54,55] up to 480 MIL-100 [55] up to 820 Cr-MIL-101 [55] up to 1400 UiO-66 [55] up to 400 CPO-27 [55] up to 680 MCM-41 [56] up to 400 tively low pressures (intrusion pressure up to 5MPa with an extrusionp ressure of 0.3MPa). The material was able to take up as ubstantial amount of liquid (1000 mm 3 g À1 for water and between 1100-1200 mm 3 g À1 for LiCl solution) in the pores.…”

Section: Methodsmentioning

confidence: 99%

A Porous POSiSil Suited for Pressure‐Driven Reversible Confinement of Solutions: PSS‐2

Smet

Verlooy

Pulinthanathu

et al. 2019

Chemistry A European J

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Polyoligosiloxysilicone (POSiSil; designated PSS‐2) is a copolymer of double four‐ring (D4R) cyclosilicate and dimethylsiloxane. It is synthesized by linking D4R units in tetrabutylammonium cyclosilicate crystals with dimethyldichlorosilane. The structure of PSS‐2 was revealed using solid state NMR spectroscopy. In this 3D copolymer D4R units are connected systematically by short siloxane chains most likely composed of 2 to 3 dimethylsiloxane monomers. Controlling the conversion of the parent material allows for tuning the porosity of PSS‐2. Residual parent material is embedded inside PSS‐2 polymer and can be eliminated by calcination. This leaves nanovoids inside PSS‐2, which is moderately hydrophobic. Pressure‐driven intrusion–extrusion cycles of aqueous solution exhibit hysteresis, thus, PSS‐2 can be used as reversible confinement for liquids with a capacity of around 1000 mm3 g−1 in porosity.

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Endowing Zeolite LTA Superballs with the Ability to Manipulate Light in Multiple Ways

Tao

et al. 2020

Angewandte Chemie

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Advances in zeolites research emerging from interdisciplinary efforts have opened new opportunities beyond conventional applications. Colloids drive much current research owing to their distinct collective behaviors, but so far, using zeolites as a colloidal building block to construct ordered superstructures remains unexplored. Herein we show that selfassembly of colloidal zeolite LTA superball (ZAS) by tiltedangle sedimentation forms macroscopic films with micromesoporosity and 3D long-range periodicity featuring a photonic band gap (PBG) that is tunable through the superball geometry and responds reversibly to chemical vapors. Remarkably, self-assembly of ZAS at elevated temperature forms 3D chiral photonic crystals that enable negative circular dichroism, selective reflection of right-handed circularly polarized (CP) light and left-handed CP luminescence based on PBG. We present a novel class of functional colloids and zeolite-based photonic crystals with the ability to manipulate light in several ways.

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Relation of water adsorption capacities of zeolites with their structural properties

Cited by 75 publications

References 30 publications

Effect of nucleating agent supported on zeolite via the impregnation on the crystallization ability of isotactic polypropylene and its mechanism

Effect of nucleating agent supported on zeolite via the impregnation on the crystallization ability of isotactic polypropylene and its mechanism

A Porous POSiSil Suited for Pressure‐Driven Reversible Confinement of Solutions: PSS‐2

Endowing Zeolite LTA Superballs with the Ability to Manipulate Light in Multiple Ways

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