Amine Silica Composites
Amine Silica Composites - Related Videos
08:00
A Synthetic Methodology for Preparing Impregnated and Grafted Amine-Based Silica Composites for Carbon Capture
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Cited by 5 •
2023
This work aims to facilitate the development of standardized techniques for impregnating or grafting aminated compounds onto silica substrates, which are often broadly described in the literature. Specific amounts of solvent, substrate, amines, and the values of other important experimental parameters will be discussed in detail.
01:19
Amines to Amides: Acylation of Amines
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2025
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond. Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
09:11
Porosimetry of a Silica Alumina Powder
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Surface area and pore size distribution are attributes used by adsorbent and catalyst manufacturers and users to ensure quality control and to determine when products are at the end of their useful lives. The surface area of a porous solid is directly related to its adsorption capacity or catalytic activity. The pore size distribution of an adsorbent or catalyst is...
01:30
Preparation of Amines: Alkylation of Ammonia and Amines
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2025
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation. Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
07:51
Fabrication of Silica Ultra High Quality Factor Microresonators
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Cited by 22 •
2012
We describe the use of a carbon dioxide laser reflow technique to fabricate silica resonant cavities, including free-standing microspheres and on-chip microtoroids. The reflow method removes surface imperfections, allowing long photon lifetimes within both devices. The resulting devices have ultra high quality factors, enabling applications ranging from telecommunications to biodetection.
FAQs
Selectivity comes from the chemical contrast between amine binding sites and the molecules contacting them. The amines can preferentially interact with acidic molecules, while the silica architecture controls access to those sites. Adjusting surface chemistry and pore accessibility can therefore change both adsorption capacity and molecular preference, supporting separations designed for particular chemical mixtures.
Silica supplies structural stability and a porous environment that keeps the reactive interface accessible. When amine-containing regions coordinate with metal ions, the framework helps present those sites within a defined solid structure. Because pore structure is tunable, researchers can investigate how accessibility and surface arrangement influence metal-ion binding and the resulting selectivity.
Composition determines how many amine sites are available and how they are presented within the silica framework. Increasing or modifying the functional contribution can change the balance among binding capacity, selectivity, pore accessibility, and structural stability. This tunability is important when designing composites that must perform consistently and be reused.
Two formation strategies are identified for these materials: incorporating amine-containing molecules into silica or covalently grafting them onto the silica surface. These routes place the reactive groups in different relationships to the framework. Comparing them helps relate molecular attachment to surface chemistry, porosity, binding behavior, and the final composite’s suitability for a targeted chemical task.
Amine silica composites support several chemistry workflows because their surface interactions can be tailored. In separation, selective adsorption helps distinguish acidic molecules or metal ions. In catalysis and sensing, the reactive solid interface can participate in or report chemical interactions. The same platform therefore connects surface design with practical control of selectivity and response.
Their amine functionality supplies chemically active sites for interaction with carbon dioxide, while the silica component contributes a stable, porous scaffold. Researchers can vary composition and surface chemistry to seek a useful balance of capture capacity, selectivity, accessible sites, and reusability, making the materials candidates for tunable capture systems.