06-P-05 -X- ray diffraction analysis of ordered mesoporous silica

Gold nanorods (GNRs) were deposited in ordered mesoporous silica SBA-15 by a liquid-phase synthesis. The X-ray diffraction pattern of GNRs-deposited SBA-15 (GNRs/SBA-15) confirmed that the mesoporous structure of the SBA-15 was maintained even after depositing GNRs in the SBA-15 pores. Laser irradiation and heat treatment for GNRs/SBA-15 were carried out to check the effect on the GNRs morphology alteration. These treatments were found to shorten the length of the GNRs in SBA-15, leading to a blue shift of the surface plasmon resonance wavelength of the GNRs. Especially, heat treatment at high temperatures, e.g. at 500 °C, showed unique result that the inner wall of SBA-15 was collapsed by the overgrowth of gold nanoparticles.

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Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Minerals ◽

10.3390/min9050264 ◽

2019 ◽

Vol 9 (5) ◽

pp. 264 ◽

Cited By ~ 6

Author(s):

Hongyun Chen ◽

Siyao Fu ◽

Liangjie Fu ◽

Huaming Yang ◽

Deliang Chen

Keyword(s):

Mesoporous Silica ◽

Bet Surface Area ◽

Ammonium Bromide ◽

X Ray Diffraction ◽

X Ray ◽

Chemical Structures ◽

Ordered Mesoporous ◽

Silica Materials ◽

Mesoporous Silica Materials ◽

Mcm 41

Silica reagents are expensive and toxic for use in the synthesis of mesoporous silica materials. It is imperative to take an interest in green silicon sources. In this paper, we report the synthesis of hexagonal and ordered aluminum-containing mesoporous silica materials (Al–MCM–41) from natural perlite mineral without addition of silica or aluminum reagents. A pretreatment process involving acid leaching, alkali leaching, and strongly acidic cation exchange resins treatment was critical to obtain silicon and aluminum sources from natural perlite mineral. The Al–MCM–41 material was synthesized via a hydrothermal reaction with hexadecyl trimethyl ammonium bromide (CTAB) as the template and subsequent calcination. The resulting mesophase had a hexagonal and ordered mesoporous structure, confirmed by small-angle X-ray diffraction (SAXRD) and transmission electron microscopy (TEM). Al–MCM–41 material had a high Brunauer–Emmet–Teller (BET) surface area of 1024 m2/g, pore volume of 0.72 cm3/g and an average pore diameter of 2.8 nm with a pore size distribution centered at 2.5 nm. The thermal behavior of the as-synthesized samples during calcination was investigated by thermogravimetry (TG) and differential thermogravimetry (DTG) analysis. The Al–MCM–41 material showed a negative surface charge in aqueous solution with the pH value ranging from 2 to 13. The variations of chemical structures from natural perlite to Al–MCM–41 were traced by wide-angle X-ray diffraction (WAXRD) and Fourier-transform infrared spectroscopy (FTIR). A proposed mechanism for the synthesis of hexagonal and ordered mesoporous silica materials from natural perlite is discussed.

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Pore Structure and Fluid Sorption in Ordered Mesoporous Silica. I. Experimental Study by in situ Small-Angle X-ray Scattering

The Journal of Physical Chemistry C ◽

10.1021/jp8100392 ◽

2009 ◽

Vol 113 (34) ◽

pp. 15201-15210 ◽

Cited By ~ 54

Author(s):

Susanne Jähnert ◽

Dirk Müter ◽

Johannes Prass ◽

Gerald A. Zickler ◽

Oskar Paris ◽

...

Keyword(s):

Experimental Study ◽

Mesoporous Silica ◽

Pore Structure ◽

Small Angle ◽

Ordered Mesoporous Silica ◽

X Ray ◽

X Ray Scattering ◽

Ordered Mesoporous ◽

Ray Scattering

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Pore Structure Control of Ordered Mesoporous Silica Film Using Mixed Surfactants

Journal of Nanomaterials ◽

10.1155/2011/326472 ◽

2011 ◽

Vol 2011 ◽

pp. 1-5 ◽

Cited By ~ 7

Author(s):

Tae-Jung Ha ◽

Hyeon-Gyoon Im ◽

Seok-Jin Yoon ◽

Ho Won Jang ◽

Hyung-Ho Park

Keyword(s):

Mesoporous Silica ◽

Pore Structure ◽

New Technology ◽

Silica Film ◽

Ordered Mesoporous Silica ◽

X Ray Diffraction ◽

Silica Films ◽

Structure Control ◽

Ordered Mesoporous ◽

Mesoporous Silica Film

Materials with nanosized and well-arranged pores have been researched actively in order to be applied to new technology fields. Especially, mesoporous material containing various pore structures is expected to have different pore structure. To form a mixed pore structure, ordered mesoporous silica films were prepared with a mixture of surfactant; Brij-76 and P-123 block copolymer. In mixed surfactant system, mixed pore structure was observed in the region of P-123/(Brij-76 + P-123) with about 50.0 wt.% while a single pore structure was observed in regions which have large difference in ratio between Brij-76 and P-123 through the X-ray diffraction analysis. Regardless of surfactant ratio, porosity was retained almost the same. It is expected that ordered mesoporous silica film with mixed pore structure can be one of the new materials which has distinctive properties.

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Adsorption Features of Various Inorganic Materials for the Drug Removal from Water and Synthetic Urine Medium: A Multi-Technique Time-Resolved In Situ Investigation

Materials ◽

10.3390/ma14206196 ◽

2021 ◽

Vol 14 (20) ◽

pp. 6196

Author(s):

Enrico Boccaleri ◽

Cristina Marzetti ◽

Giorgio Celoria ◽

Claudio Cassino ◽

Geo Paul ◽

...

Keyword(s):

Mesoporous Silica ◽

Powder Diffraction ◽

Emerging Contaminants ◽

Model Compound ◽

Inorganic Materials ◽

Ordered Mesoporous Silica ◽

Time Resolved ◽

X Ray ◽

Ordered Mesoporous

Pharmaceutical active compounds, including hundreds of different substances, are counted among the emerging contaminants in waterbodies, whose presence raises a growing concern for the ecosystem. Drugs are metabolized and excreted mainly through urine as an unchanged active ingredient or in the form of metabolites. These emerging contaminants are not effectively removed with the technologies currently in use, making them a relevant environmental problem. This study proposes the treatment of urine and water at the source that can allow an easier removal of dissolved drugs and metabolites. The treatment of synthetic urine, with dissolved ibuprofen as a model compound, by adsorption, using various classes of inorganic materials, such as clays, hierarchical zeolites and ordered mesoporous silica (MCM-41), is presented. A multi-technique approach involving X-ray powder diffraction, solid-state NMR, UV-Vis and Raman spectroscopies was employed to investigate the adsorption process in inorganic adsorbents. Moreover, the uptake, the ensuing competition, the efficiency and selectivity as well as the packing of the model compound in ordered mesoporous silica during the incipient wetness impregnation process were all thoroughly monitored by a novel approach, involving combined complementary time-resolved in situ 1H and 13C MAS NMR spectroscopy as well as X-ray powder diffraction.

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Controlling the Wall Thickness and Pore Size of SBA-15 by Using PPG and PEG as Additives

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.152-153.1514 ◽

2010 ◽

Vol 152-153 ◽

pp. 1514-1518

Author(s):

Ji Xin Su ◽

Ming Bo Zhang ◽

Li Yuan Ma ◽

Shen Ping Zhang ◽

Fei Fei Dong

Keyword(s):

Pore Size ◽

Wall Thickness ◽

Hexagonal Structure ◽

Polypropylene Glycol ◽

Ordered Mesoporous Silica ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Ordered Mesoporous ◽

Adsorption Desorption

Ordered mesoporous silica SBA-15 with controlled pore size and wall thickness was synthesized using polypropylene glycol (PPG) and polyethylene glycol (PEG) as different additives. The final samples were characterized by low-angle X-ray diffraction, N2 adsorption-desorption and transmission electron microscopy. The SBA-15 used PPG or PEG as additive all could maintain the two-dimensional hexagonal structure. The addition of PPG could expand the pore size and decrease the wall thickness and the addition of PEG could reduce the pore size and increase the wall thickness of SBA-15.

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