Self-Assembly of Layered Aluminum Silsesquioxanes: Clay-Like Organic-Inorganic Nanocomposites

1996 ◽  
Vol 457 ◽  
Author(s):  
L. Ukrainczyk ◽  
R. A. Bellman ◽  
K. A. Smith ◽  
J. E. Boyd
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Layered Silicate ◽  
Wide Range ◽  
Inorganic Nanocomposites ◽  
Temperature And Pressure ◽  
Xrd Patterns ◽  
Degree Of Condensation ◽  
Inorganic Framework ◽  
Sol Gel Synthesis

ABSTRACTA series of layered silicate-like structures with a wide range of Si/AI ratios that have an organic functionality directly bonded to the structural Si atom by Si-C bond were prepared by template sol-gel synthesis at room temperature and pressure. XRD patterns indicate that organic functionalities in the interlayers are in paraffin-like arrangement and do not interpenetrate. Structural ordering is primarily governed by the assembly of the organic functionalities into lamellar micelles. Nanocomposites were studied by solid state 29Si and 27AI NMR to determine the degree of condensation of inorganic framework. The results indicate that Si-O-Al linkages do not form in gels precipitated at low pH. Stable Si-O-Al linkages form when pH of the precipitates is raised. The highest degree of Si-O-Al bonding is obtained when Al solutions are prehydrolyzed prior to the addition of silane.

Sol–gel synthesis of 2-dimensional TiO2: self-assembly of Ti–oxoalkoxy–acetate complexes by carboxylate ligand directed condensation

2021 ◽  
Author(s):  
Ruohong Sui ◽  
Connor E. Deering ◽  
Rohen Prinsloo ◽  
Christopher B. Lavery ◽  
Nancy Chou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Carboxylate Ligand ◽  
Sol Gel Synthesis ◽  
First Time

2-Dimensional TiO2 is synthesized for the first time by a sol–gel self-assembly of Ti–oxoalkoxy–acetate complexes.

scholarly journals Self-assembly of iron oxide precursor micelles driven by magnetic stirring time in sol–gel coatings

RSC Advances ◽  
2019 ◽  
Vol 9 (31) ◽  
pp. 17571-17580 ◽  
Author(s):  
J. López-Sánchez ◽  
A. Serrano ◽  
A. del Campo ◽  
M. Abuín ◽  
E. Salas-Colera ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Self Assembly ◽  
Sol Gel ◽  
Oxide Precursor ◽  
Magnetic Stirring ◽  
Stirring Time ◽  
Self Assembled ◽  
Sol Gel Synthesis

Sol–gel synthesis of self-assembled iron oxide precursor micelles.

scholarly journals Unravelling a Novel Sol-Gel Transition Mechanism in Polymer Self-Assemblies: An Order-Order Transition Based on Specific Molecular Interactions Between Hydrophilic and Hydrophobic Polymer Blocks

2021 ◽  
Author(s):  
Lukas Hahn ◽  
Theresa Zorn ◽  
Josef Kehrrein ◽  
Tobias Kielholz ◽  
Benedikt Sochor ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Order Transition ◽  
Dynamics Simulation ◽  
Aqueous Polymer ◽  
Transition Mechanism ◽  
Wide Range ◽  
Spherical Micelles ◽  
Sol Gel Transition

Using a wide range of state-of-the art analytical techniques and molecular dynamics simulation, a novel mechanism for macromolecular interactions are described. Distinct interactions between the hydrophilic and hydrophobic blocks in amphiphilic triblock copolymers lead to an order-order transition from spherical micelles to worm-like micelles upon cooling the aqueous polymer solutions below room temperature. Macroscopically, this this leads to reversible gelation. This novel mechanism represent a novel building block to better understand polymer self-assembly.<br>

scholarly journals A sol–gel synthesis to prepare size and shape-controlled mesoporous nanostructures of binary (II–VI) metal oxides

RSC Advances ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 14134-14146 ◽  
Author(s):  
Ryan Yarbrough ◽  
Klinton Davis ◽  
Sheeba Dawood ◽  
Hemali Rathnayake
Keyword(s):  
Low Temperature ◽  
Metal Oxides ◽  
Self Assembly ◽  
Sol Gel ◽  
Assembly Process ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Shape Controlled ◽  
Sol Gel Synthesis ◽  
Mesoporous Metal

A base-catalyzed sol–gel approach combined with a solvent-driven self-assembly process at low temperature is augmented to make highly mesoporous metal oxide nanostructures of manganese and copper, and hydroxide nanostructures of magnesium.

Multistep, sol-gel synthesis of a layered silicate, potassium fluorophlogopite

1991 ◽  
Vol 3 (5) ◽  
pp. 772-775 ◽  
Author(s):  
Florangel D. Duldulao ◽  
James M. Burlitch
Keyword(s):  
Sol Gel ◽  
Layered Silicate ◽  
Sol Gel Synthesis

Sol-Gel Synthesis of FHA Nanoparticles and CDHA Agglomerates from a Mixture with a Nonstochiometric Ca/P Ratio

2008 ◽  
Vol 396-398 ◽  
pp. 607-610 ◽  
Author(s):  
R. Jahandideh ◽  
Aliasghar Behnamghader ◽  
M. Rangie ◽  
A. Youzbashi ◽  
S. Joughehdoust ◽  
...  
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Triethyl Phosphite ◽  
Ammonium Fluoride ◽  
Powder Morphology ◽  
Dispersed Particles ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Average Size ◽  
Sol Gel Synthesis

The aim of this study was to investigate the sol gel synthesis of HA/FA nanoparticles and the possible formation of TCP phase or unstoichiometric calcium deficient hydroxyapatite (CDHA) from the precursors with a Ca/P ratio of 1.62. In order to prepare the sol, the solutions of Triethyl phosphite, ammonium fluoride and calcium nitrate in ethanol were used respectively as P, F and Ca precursors. The crystallinity, particle and crystallite size, powder morphology, chemical structure and phase analysis were investigated by SEM, XRD, FT-IR and Zeta sizer experiment. A multiphase compound containing hydroxyapatite (HA) and fluoroapatite (FA) nanoparticles and calcium deficient hudroxyapatite (CDHA) agglomerates was obtained. The size of the crystallites estimated from XRD patterns using Scherrer equation and the crystallinity of HA phase were about 5 nm and 66% respectively. The zeta sizer experiments for the dispersed particles in its own conditions showed an average size of 98 nm.

Sol–gel synthesis of monolithic materials with hierarchical porosity

2016 ◽  
Vol 45 (12) ◽  
pp. 3377-3399 ◽  
Author(s):  
A. Feinle ◽  
M. S. Elsaesser ◽  
N. Hüsing
Keyword(s):  
Porous Materials ◽  
Sol Gel ◽  
Length Scales ◽  
Hierarchical Porosity ◽  
High Interest ◽  
Wide Range ◽  
Synthetic Routes ◽  
Sol Gel Synthesis

The development of synthetic routes to porous materials containing multiple, discrete sets of pores having disparate length scales is of high interest for a wide range of applications.

scholarly journals Synthesis and Characterizations of SiO2-Ag Core-Shell Nanostructure Using Fatty Alcohols as Surface Modifiers

2015 ◽  
Vol 773-774 ◽  
pp. 199-203 ◽  
Author(s):  
Musdalilah Ahmad Salim ◽  
H. Misran ◽  
S.Z. Othman ◽  
Nurfatihah Mahadi ◽  
Nur Irfah Mohd Pauzi ◽  
...  
Keyword(s):  
Self Assembly ◽  
Ag Nanoparticles ◽  
Sol Gel ◽  
Amorphous Structure ◽  
Fatty Alcohols ◽  
Core Shell ◽  
Face Centered Cubic ◽  
Surface Modifiers ◽  
Face Centered ◽  
Xrd Patterns

SiO2-Ag core-shell nanostructure with silica core (SiO2) and silver shell (Ag) nanoparticles with spherical morphology were successfully synthesized using a modified self-assembly sol-gel method. Ag nanoparticles at ca.10-50 nm were successfully attached on monodispersed silica spheres (SiO2) with diameter of ca. 450 nm. Renewable resources of palm oil, derived fatty alcohols (octyl-alcohol (C8), decyl-alcohol (C10) and dodecyl-alcohol (C12)) were employed as nonsurfactant surface modifiers prior to coating with Ag nanoparticles. X-ray diffraction (XRD) patterns of calcined SiO2-Ag core-shell nanostructure prepared with surface modifiers exhibited amorphous structure of SiO2 (core) and face-centered cubic (FCC) structure of metallic Ag nanoparticles (shell). The results obtained in the present work demonstrated the feasibility of employing fatty alcohols as potential nonsurfactant surface modifiers in synthesizing SiO2-Ag core-shell.

scholarly journals Synthesis of lead-based 1212 and 3212 superconductors by an aqueous sol-gel method

2009 ◽  
Vol 7 (3) ◽  
pp. 362-368 ◽  
Author(s):  
Giedre Nenartaviciene ◽  
Ramunas Skaudzius ◽  
Rimantas Raudonis ◽  
Aivaras Kareiva
Keyword(s):  
Sol Gel ◽  
Xrd Analysis ◽  
Structural Features ◽  
Complexing Agents ◽  
X Ray Diffraction ◽  
X Ray ◽  
Resistivity Measurements ◽  
Ceramic Samples ◽  
Xrd Patterns ◽  
Sol Gel Synthesis

AbstractThe aqueous sol-gel synthesis technique for the preparation of (Pb,Sr)Sr2(Y,Ca)Cu2O7±x (Pb-1212) and (Pb2,Cu)Sr2(Y,Ca)Cu2O8±x (Pb-3212) superconductors using two different complexing agents, namely 1,2-ethanediol and tartaric acid was studied. The phase transformations, composition and micro-structural features in the polycrystalline samples were studied by powder X-ray diffraction analysis (XRD), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). XRD analysis of the ceramic samples obtained by calcination of Pb-Sr-Y-Ca-Cu-O acetate-glycolate precursor gels in air, for 10 hours at 800°C and at 825°C, showed the presence of homogeneous Pb-1212 and Pb-3212 crystallites as major phases. The XRD patterns of the ceramics obtained from Pb-Sr-Y-Ca-Cu-O acetate-tartrate precursor gels, however, showed multiphasic character. The critical temperature of superconductivity (TC (onset)) observed by resistivity measurements were found to be 91 K and 75 K for Pb-1212 and Pb-3212 samples, respectively.

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