Stochastic Reconstruction and Permeation of Ceramic Membranes Prepared by the Sol-Gel Method

2002 ◽  
Vol 752 ◽  
Author(s):  
E. S. Kikkinides ◽  
V. T. Zaspalis ◽  
V. N. Burganos
Keyword(s):  
Mechanical Stability ◽  
Sol Gel ◽  
Three Dimensional ◽  
Ceramic Membranes ◽  
Momentum Equation ◽  
Void Space ◽  
Sol Gel Process ◽  
Mesoporous Membranes ◽  
Permeation Properties ◽  
Good Agreement

ABSTRACTIn the present work we study the relation between structural and permeation properties of ceramic membranes made by the sol-gel process. For this purpose, we have developed γ-Al2O3 mesoporous membranes via the sol-gel route, on top of multi-layer asymmetric α-Al2O3 macroporous supports, to induce mechanical stability. Subsequently, we employ stochastic techniques to generate three-dimensional reconstructions of the membrane and the support that share the basic structural properties of the original materials determined directly from SEM and TEM studies. The permeability of each material is estimated by solving numerically the momentum equation in the void space of the reconstructed images. The very good agreement between predicted and experimentally measured permeability values, without the need to resort to any fitting parameter, renders the proposed reconstruction methodology quite promising for reliable characterization and representation of the pore structure of this type of membranes.

Thermodynamical Calculations and Experimental Confirmation about the Mg-Al-Spinel Reaction Path in the Sol-Gel-Process

2006 ◽  
Vol 317-318 ◽  
pp. 135-138 ◽  
Author(s):  
Wilfried Wunderlich ◽  
Krupathi Vishista ◽  
Francis D. Gnanam ◽  
Daniel Doni Jayaseelan
Keyword(s):  
Thermal Analysis ◽  
Reaction Path ◽  
Sol Gel ◽  
Chemical Processing ◽  
Aluminium Isopropoxide ◽  
Spinel Formation ◽  
Sol Gel Process ◽  
Wet Chemical ◽  
Enthalpy Data ◽  
Good Agreement

The aim of this research is, to clarify which route the sol-gel-process is taking in the case of a Al-Mg-spinel slurry, in particular, whether the hydrolysis reaction or the spinel formation is faster and which of the intermediate hydroxide phases Al(OH)3, and Mg(OH)2, or MgO and Al2O3 or MgAl2O4H2O are formed during the spinel formation. The spinel-alloy was produced using the polymeric route during wet chemical processing. Aluminium-isopropoxide was hydrolyzed in order to form the boehmite-sol and then the same amount of magnesia was added and mixed. This sol precipitated as boehmite (AlOOH) and brucite (Mg(OH)2) after ageing for 12h as confirmed by differential thermal analysis (DTA), and differential thermal gravity (DTG) measurements. After that, the powders were subsequently annealed at 900oC for 3h in air and observed by TEM. Calculations using thermodynamic enthalpy data are in good agreement with the experiments and can be used to predict reaction paths in other system as well.

Nanocopying as a Means of 3D Nanofabrication: Scope and Prospects

2003 ◽  
Vol 56 (10) ◽  
pp. 1001 ◽  
Author(s):  
Toyoki Kunitake ◽  
Shigenori Fujikawa
Keyword(s):  
Sol Gel ◽  
Three Dimensional ◽  
Advantages And Disadvantages ◽  
Sol Gel Process ◽  
Nanometer Regime

The use of nanosized templates to fabricate three-dimensional architectures in the nanometer regime is still a largely unexplored field of nanotechnology. Positive and negative copying of molecules and nano-sized objects by the surface sol–gel process is useful for this purpose. The authors here give account of the techniques available to date, along with their advantages and disadvantages, is outlined.

Crystal Growth and Photoluminescence Properties of Truncated Cubic BaMgAl10O17:Eu2+ Phosphors for Three-Dimensional Plasma Display Panels

2016 ◽  
Vol 16 (4) ◽  
pp. 3869-3872 ◽  
Author(s):  
Bitao Liu ◽  
Yuan Chen ◽  
Lingling Peng ◽  
Tao Han ◽  
Hong Yu ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Sinter Process ◽  
Sol Gel ◽  
Three Dimensional ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasma Display Panels ◽  
Sol Gel Process ◽  
Plasma Display

Monodispersed, truncated cube BaMgAl10O17:Eu2+ phosphors were synthesized by the sol–gel process. Scanning electron microscope (SEM), photoluminescence spectrum, powder X-ray diffraction and decay curves were used to evaluate the truncated cubic BaMgAl10O17:Eu2+ phosphors. The crystal growth process and photoluminescence properties were discussed in detail. The results showed that this truncated cubic morphology can be achieved via a simple sinter process. These truncated cubic BaMgAl10O17:Eu2+ phosphors showed acceptable emission intensity and better thermal properties. This result indicates truncated cubic BaMgAl10O17:Eu2+ phosphors would meet the requirements of plasma display panels (PDPs).

Preparation of porous alumina microspheres via an oil-in-water emulsion method accompanied by a sol–gel process

2016 ◽  
Vol 40 (1) ◽  
pp. 589-595 ◽  
Author(s):  
Hui Yang ◽  
Yuan Xie ◽  
Guisong Hao ◽  
Weiwei Cai ◽  
Xingzhong Guo
Keyword(s):  
Porous Alumina ◽  
Sol Gel ◽  
Three Dimensional ◽  
Water Emulsion ◽  
Emulsion Method ◽  
Oil In Water ◽  
Sol Gel Process ◽  
Template Free ◽  
Oil In Water Emulsion ◽  
Interconnected Structure

Porous alumina microspheres prepared via a facile template-free approach followed by heat-treatment, exhibiting a three-dimensional interconnected structure.

Fabrication of Three-Dimensional Battery Using Ceramic Electrolyte with Honeycomb Structure by Sol–Gel Process

2010 ◽  
Vol 157 (4) ◽  
pp. A493 ◽  
Author(s):  
Masashi Kotobuki ◽  
Yuji Suzuki ◽  
Hirokazu Munakata ◽  
Kiyoshi Kanamura ◽  
Yosuke Sato ◽  
...  
Keyword(s):  
Sol Gel ◽  
Three Dimensional ◽  
Honeycomb Structure ◽  
Ceramic Electrolyte ◽  
Sol Gel Process

Preparation and Properties of Porous Apatite-Wollastonite Bioactive Glass-Ceramic

2007 ◽  
Vol 330-332 ◽  
pp. 169-172 ◽  
Author(s):  
Ming Xue ◽  
Jun Ou ◽  
Da Li Zhou ◽  
Dange Feng ◽  
Wei Zhong Yang ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Stromal Cells ◽  
Glass Ceramic ◽  
Sol Gel ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Polymer Foam ◽  
Physical Chemical ◽  
Sol Gel Process ◽  
Precursor Powders

The porous apatite-wollastonite bioactive glass-ceramic (AW-GG) was made from nano-precursor powders derived from sol-gel process, and shaped by dipping method with polymer foam. The physical-chemical properties, bioactivity and biocompatibility of the materials were studied by means of TG, XRD, SEM, TEM and so on. The bioactivity was investigated in simulated body fluid (SBF) and the biocompatibility was evaluated by co-culturing with marrow stromal cells (MSCs). The result shows that: the particle size of the AW precursor powders is 40~100nm; porous AW GC has three-dimensional pored structure with 300~500um macropores and 2~5um micropores; the materials possess high bioactivity and biocompatibility. Porous AW GC may therefore have great potential application as bone tissue engineering scaffold.

Controlled synthesis of V2O5/MWCNT core/shell hybrid aerogels through a mixed growth and self-assembly methodology for supercapacitors with high capacitance and ultralong cycle life

2015 ◽  
Vol 3 (30) ◽  
pp. 15692-15699 ◽  
Author(s):  
Yingjie Wu ◽  
Guohua Gao ◽  
Huiyu Yang ◽  
Wenchao Bi ◽  
Xing Liang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Three Dimensional ◽  
Cycle Life ◽  
Core Shell ◽  
Controlled Synthesis ◽  
One Pot ◽  
High Capacitance ◽  
Sol Gel Process ◽  
Hybrid Aerogels

Three-dimensional V2O5/MWCNT core/shell hybrid aerogels were controllably synthesized through a mixed growth and self-assembly methodology in a one-pot sol–gel process.

Synthesis of visible-light responsive C, N and Ce co-doped TiO2 mesoporous membranes via weak alkaline sol–gel process

2012 ◽  
Vol 22 (30) ◽  
pp. 15309 ◽  
Author(s):  
Xue Ping Cao ◽  
Dan Li ◽  
Wen Heng Jing ◽  
Wei Hong Xing ◽  
Yi Qun Fan
Keyword(s):  
Visible Light ◽  
Sol Gel ◽  
Doped Tio2 ◽  
Sol Gel Process ◽  
Mesoporous Membranes ◽  
Co Doped

scholarly journals Silicon/polypyrrole nanocomposite wrapped with graphene for lithium ion anodes

MRS Advances ◽  
2017 ◽  
Vol 2 (54) ◽  
pp. 3323-3327 ◽  
Author(s):  
Changling Li ◽  
Chueh Liu ◽  
Zafer Mutlu ◽  
Yiran Yan ◽  
Kazi Ahmed ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Sol Gel ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Hydroxyl Groups ◽  
Transport Pathways ◽  
Fiber Network ◽  
Reduced Graphene ◽  
Sol Gel Process

ABSTRACTHerein, silicon nanoparticles (SiNPs) are coated with conducting hydrogel and wrapped with reduced graphene oxide (rGO) sheets via a facile and scalable solution-based sol-gel process. The in-situ polymerized polypyrrole (PPy) hydrogel forms an interconnected three-dimensional (3D) fiber matrix. Amine and hydroxyl groups from the hydrogel assist the encapsulation of the SiNPs through hydrogen bonding. The electro-conductive PPy fiber network and the wrapping of rGO offer efficient electron and ion transport pathways. The PPy/SiNPs/rGO electrodes can produce highly reversible capacities of 1312, 1285 and 1066 mAh g-1 at 100, 250 and 500 cycles at a current density of 2.1 A g-1, respectively.

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