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Viveka Alfredsson - Staff members Lunds tekniska högskola

The particles obtained in this synthesis varied with a diameter up to values around 200 nm. Keywords: Mesoporous silica, particle size, pore size, SBA-15. We demonstrate morphology and pore size dependence of silica nanoparticles (SNPs) synthesized via control of the iron oxidation state. In the absence of any Fe species, only spherical SNPs are produced, whereas in the presence of Fe3+ and Fe2+ ions, SNPs with rod-like and nanosheet morphologies, 10 respectively, are formed. It has already been known that the pore size of mesoporous silica (including MSN) can be enlarged by adding substances, like alkanes, alcohols, and trialkylbenzenes (TAB), into amphiphilic molecules or varying experimental conditions including the concentration of surfactants and the kinds of catalysts. 46–51,63,65–75 One of the most frequently used expanders is TAB such as 1,3,5 1998-11-13 These materials showed extraordinary properties such as monodisperse pore size distribution, large surface areas and pore volumes. The main focus of this thesis has been on synthesis and functionalisation of spherical mesostructured silica particulate materials.

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The main objective of this project has been to study and develop syntheses of mesoporous silica suitable for large scale It has already been known that the pore size of mesoporous silica (including MSN) can be enlarged by adding substances, like alkanes, alcohols, and trialkylbenzenes (TAB), into amphiphilic molecules or varying experimental conditions including the concentration of surfactants and the kinds of catalysts. 46–51,63,65–75 One of the most frequently used expanders is TAB such as 1,3,5-triisopropylbenzene (TIPB) or 1,3,5-trimethylbenzene (TMB). 76–78 TAB can enlarge the pore size of MSN and TPOS as a Si source, both the pore size (from 4 nm to 8 nm) and particle diameter (from 50 nm to 380 nm) were enlarged, depending on the amount of TIPB. When an excess amount of TMB was used as TAB, the pore size of CMPS was enlarged above 10 nm, but the mesostructure and particle morphology were varied.

The radial dependence of the spatial mesostructure of

Silica, mesostructured, MCM-41 type (hexagonal), The synthesized LP-MSNs are 100-200 nm in diameter and are composed of cage-like pores organized in a cubic mesostructure. The size of the cavities is about 28 nm with an entrance size of 13.4 nm. Mesostructured particulate silica materials with tunable pore size : Synthesis, characterization and applications Sörensen, Malin Helena, 1979- (author) KTH,Ytkemi (stängd 20081231),Ytkemi Claesson, Per, Professor (thesis advisor) KTH,Ytkemi (stängd 20081231) Alfredsson, Viveka (opponent) (creator_code:org_t) ISBN 9789174152432 Stockholm pore size 0.98 cm3/g pore volume 2.1-2.7 nm pore size surface area spec. surface area ~1000 m2/g (BET) bp 2230 °C(lit.) Description Application Adsorbant, catalyst support, nanoscale template Silicon dioxide, also known as silica (from the Latin silex), is a chemical compound that is an oxide of silicon with the chemical formula SiO2.

Anders Palmqvist - Chalmers Research

A high number of different functionalities have been incorporated onto the SBA-15 material [24]. Two of the most attractive functionalities are amino [25-29] and carboxylic acid groups [30, 31]. There are two main approaches to the silica The gels were nanoparticles into the pores of mesostructured silica. For MS8, the pore size of monodisperse size (2.5 nm) inside the mesopores of has significantly decreased simultaneously with the stan- the MS3.5 materials but also larger particles (4–5 nm) dardized pore volume and At loadings of 2.0–10 wt %, MSU‐J silica with an average framework pore size of 14 nm (65 °C assembly temperature) provides superior reinforcement properties in comparison to MSU‐J silica with a smaller average framework pore size of 5.3 nm (25 °C assembly temperature), even though the surface area of the larger pore mesostructure (670 m 2 g −1) is substantially lower than the with Controlled Pore Size, Particle Diameter, and Morphology (TAB) of colloidal mesostructured silica nanoparticles (CMSS) to obtain colloidal mesoporous silica nanoparticles (CMPS) by a dialysis process.

The main objective of this project has been to study and develop syntheses of mesoporous silica suitable for large scale It has already been known that the pore size of mesoporous silica (including MSN) can be enlarged by adding substances, like alkanes, alcohols, and trialkylbenzenes (TAB), into amphiphilic molecules or varying experimental conditions including the concentration of surfactants and the kinds of catalysts. 46–51,63,65–75 One of the most frequently used expanders is TAB such as 1,3,5-triisopropylbenzene (TIPB) or 1,3,5-trimethylbenzene (TMB). 76–78 TAB can enlarge the pore size of MSN and TPOS as a Si source, both the pore size (from 4 nm to 8 nm) and particle diameter (from 50 nm to 380 nm) were enlarged, depending on the amount of TIPB. When an excess amount of TMB was used as TAB, the pore size of CMPS was enlarged above 10 nm, but the mesostructure and particle morphology were varied. When TMOS and TIPB were used, The use of a suitable block copolymer ((CH2CH2CH2(CH)CH2CH3)79(OCH2CH2)89OH), “KLE”) and an ionic liquid template (leading to pores 3 nm in diameter) generated a bimodal pore system of deformed spherical mesopores of ca. 6 nm × 16 nm with the smaller pores being located in the matrix between the larger ones.
100 vol alcohol

Two of the most attractive functionalities are amino [25-29] and carboxylic acid groups [30, 31]. There are two main approaches to the silica The mixtures quently, there is extensive interest in the development were stirred during 30 min and then autoclaved during of new methodologies to obtain well-dispersed metal 20 h under static conditions at 115 °C. The gels were nanoparticles into the pores of mesostructured silica. The aim of this paper was to verify a possible correlation between the pore-size of mesoporous silica nanoparticles (MSNs) and the sizes of gold nanoparticles (AuNPs) obtained by an impregnation of gold(III) chloride hydrate solution in the MSNs, followed by a specific thermal treatment.

Narendra Yamdaghi (Elementary Particle Physics, Fysikum SU) and Christian Bohm Sliding, Deformation and Grain Size Che, Mesostructured silica based delivery system for a drug with a peptide as a cell-penetrating  Controlling particle morphology and size in the synthesis of mesoporous SBA-15 Formation of a new Ia(3)over-bard cubic meso-structured silica via triblock  Latex particle behavior studied in the wet state with fluorescence microscopy Ibuprofen Loading into Mesostructured Silica using Liquid Carbon Dioxide as a Terthiophene in Micellar Solutions: Influence of Micellar Size and Charge on the  Amino-functionalization of large-pore mesoscopically ordered silica by a Taguchi, A., 2003, Nanotechnology in Mesostructured Materials, Proceedings of the 3  Soft Condensed Matter; Colloidal Particle Interactions; Self-assembly In Situ Observation of the Genesis of Mesoporous Silica SBA-15: Dynamics on Length Scales from 1 nm to 1 mu m. Swelling of a mesostructured zirconium oxide film.
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76–78 TAB can enlarge the pore size of MSN and TPOS as a Si source, both the pore size (from 4 nm to 8 nm) and particle diameter (from 50 nm to 380 nm) were enlarged, depending on the amount of TIPB. When an excess amount of TMB was used as TAB, the pore size of CMPS was enlarged above 10 nm, but the mesostructure and particle morphology were varied.