Silane functionalized open-celled ceramic foams as support structure in metal organic framework composite materials

Betke, Ulf; Proemmel, Steven; Rannabauer, Stefan; Friedrich, Alexandra; Scheffler, Michael; Scheffler, Franziska

doi:10.1016/j.micromeso.2016.10.011

Cited by 26 publications

(25 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A detailed description of the slurry preparation, template coating, and thermal treatment prior to sintering is given elsewhere. [17] The wet mass m wet of the coated 8 cm 3 foams was adjusted to 2.2 AE 0.1 g or to 1.8 AE 0.1 g for the samples with lower porosity (P low ) and higher porosity (P high ), respectively. The mass fraction of the alumina in the slurry was 78.3%, using MgO doped alumina of the types CT 3000 SG, CT 1200 SG, or CT 800 SG (Almatis AG, Ludwigshafen, Germany).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

et al. 2017

Self Cite

View full text Add to dashboard Cite

Infiltration processing of reticulated porous alumina ceramics (RPC) from reticulated foam manufacturing is investigated by micro computed tomography. Infiltration is carried out with colloidal alumina slurries. Successful infiltration is found to be a function of the RPCs starting microstructure and the particle size of the alumina in the colloidal infiltration system. Suitable infiltration conditions are specified. As a result, RPCs with a low relative density show a fivefold compressive strength after infiltration, as compared to their non-infiltrated RPC counterparts. The highest strength of infiltration processed alumina RPCs at a porosity of 90% is found to be 1.6 MPa, and besides a significant increase of the compressive strength, the thermal conductivity is improved to be 1.5 W m À1 K À1 after infiltration.

show abstract

Section: Methodsmentioning

confidence: 99%

“…A detailed description of the measurement procedure is given elsewhere. [17] 3. Results and Discussion…”

Section: Methodsmentioning

confidence: 99%

Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…[20] Within the present study, the varied parameters with respect to the slurry composition included a solid loading of 73-78 wt%, a binder concentration of 0.0 to 1.6 wt% and an amount of deflocculant of 0.4-2.3 wt%. Each slurry was prepared as described below, an overview of all studied slurry compositions can be found in were added followed by a second planetary centrifugal mixing step (2 000 rpm, 15 min).…”

Section: Slurry and Ceramic Foam Preparationmentioning

confidence: 99%

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

et al. 2017

Self Cite

View full text Add to dashboard Cite

Fine-pored, 45 ppi (pores per linear inch) alumina foams are prepared from ceramic slurries with varying contents of additives (deflocculant, binder) and solid loading following a standardized procedure. Rheological key parameters (yield stress, high-shear viscosity) of the respective slurries are determined by approximation of the experimental flow curves with appropriate rheological models. The resulting ceramic foams are characterized by computed tomography (CT) followed by a morphometric analysis of the reconstruction volume data. The main scope of the work involves the development of a procedure to reliably define the binarization threshold during these morphometric calculations, which is based on the analysis of the differential course of the total porosity results from calculations performed at varying binarization threshold values ("differential thresholding"). A very good match of the CT porosity results with experimental data is achieved, despite the unfavorable CT voxel resolution to foam structure fineness relation. The CT evaluation results are finally correlated to the rheological properties of the respective slurries used in foam manufacturing. The dominant slurry composition parameters are the weight fraction of the ceramic powder and the binder concentration. Increasing binder and solid content result in an increased yield stress and viscosity of the respective dispersion and consequently in a decreased porosity and cell size of the finally manufactured cellular ceramic.

show abstract

“…The crystallization coating of alumina as well as ob-SiC ceramic foams with the metal organic frameworks Al(OH) [66] The chemical surface properties of the cellular supports were modified by a reaction with functional trialkoxysilanes; the influence of the polarity of the silane functional group (nonpolar C 8 alkyl chain or terephthalate grafted aminopropyl moiety) on the amount of deposited MOF material was studied. For HKUST-1 and CAU-10, opposing trends were observed: The amount of HKUST-1 grown on the foam struts depends primarily on the pore count and specific surface area of the support, the influence of the strut's surface chemical properties was negligible.…”

Section: In Situ Direct Crystallization Of Microporous Coatingsmentioning

confidence: 99%

“…The parameter r strut is the average strut radius accessible from the evaluation of m-CT reconstructions, for details see ref. [66] Finally, the mean coating thickness d coating, rod can be calculated according to Equation 3:…”

Section: Determination Of the Coating Thicknessmentioning

confidence: 99%

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

et al. 2017

Self Cite

View full text Add to dashboard Cite

Reticulated ceramic foams are used in a wide range of applications such as filters, catalyst supports, lightweight materials, energy absorptions materials, or as scaffolds for tissue engineering as the most common ones. Based on gaseous foaming processes of polymers, a stochastic distribution of closed pores is obtained. By reticulation processing thin foam windows are removed between cells turning a closed cell into an open cell structure. These foams are used as template for porous ceramics manufacturing: With different processing approaches, for example, with dip coating of a ceramic slurry and a subsequent (multistep) thermal treatment ceramic reticulate foams are obtained. A variety of material properties strongly depend on the cell and strut size, as well on material composition. Functionalization of ceramic foam surfaces (outer surface functionalization), for example, with zeolites or nanosized aggregates lead to an increase of the specific surface area or provides catalytic or heat storage functionality. Filling of struts (inner surface functionalization) may lead to improved mechanical stability or may provide functionalities such as electric conductivity. The present work summarizes the processing steps from the template foam to the final cellular ceramic, functionalization strategies, and the most common characterization techniques.

show abstract

Silane functionalized open-celled ceramic foams as support structure in metal organic framework composite materials

Cited by 26 publications

References 44 publications

Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

Contact Info

Product

Resources

About