Amine-coated Quartz
Amine-coated Quartz - Related Videos
07:37
Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition
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Cited by 7 •
2015
A protocol is presented for the preparation of piezoelectric macroporous epitaxial films of quartz on silicon by solution chemistry using dip-coating and thermal treatments in air.
02:58
Rodent Brain Microinjection Using a Quartz Microneedle
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2025
Source: Paolone, G., et al. Personalized Needles for Microinjections in the Rodent Brain. J. Vis. Exp. (2018).This video demonstrates a rodent brain microneedle injection using a quartz microneedle with holes. The microneedle is attached to a syringe and micropump to control the delivery rate. The needle with the injection solution is inserted into the brain with the delivery speed set at low. Once positioned, the delivery speed is increased. The needle is withdrawn after a brief pause.
09:46
Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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2013
Cross-conjugated cruciform fluorophores based on 1,4-distyryl-2,5-bis(arylethynyl)benzene and benzobisoxazole nuclei can be used to qualitatively identify diverse Lewis acidic and Lewis basic analytes. This method relies on the differences in emission colors of the cruciforms that are observed upon analyte addition. Structurally closely related species can be distinguished from each other.
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...
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...
FAQs
The layer forms when silane groups from the aminosilane condense with silanol groups on hydroxylated quartz. This reaction anchors the functionalizing molecule to the surface and leaves amine groups exposed at the interface. The resulting arrangement preserves quartz as the underlying support while supplying chemically accessible sites for subsequent molecular attachment and interfacial reactions.
Hydroxylation provides surface silanols, which are the chemical groups that react with the silane portion of the aminosilane. Without these sites, formation of the covalently bonded layer would not be supported by the described condensation mechanism. In practice, the surface chemistry of the quartz therefore controls whether the aminosilane can establish a functional interface.
Protonatable amines can change their charge state in response to the chemical environment, allowing the interface to participate in electrostatic interactions. This property helps the surface interact with acids and other charged or polar materials, while the amine groups also provide reactive sites for covalent coupling. Both interaction modes expand the types of molecules that can be immobilized.
Covalent coupling creates a chemical bond between an interfacial amine and an attached material, whereas electrostatic attachment relies on attraction between charged species. The first approach emphasizes chemical immobilization, while the second uses the charge behavior of protonatable amines. This distinction lets researchers select an attachment strategy according to the desired surface interaction and experimental purpose.
Preparation begins with hydroxylated quartz, followed by treatment with an aminosilane. During treatment, the silane groups condense with surface silanols to establish a covalently bonded layer. Because the amines remain exposed after anchoring, the finished surface can then be used for attachment of acids, biomolecules, polymers, or other functional materials through appropriate chemical or electrostatic interactions.
Quartz contributes stability and optical properties, while the amine coating adds chemical reactivity that the untreated support does not provide in the same way. Combining these characteristics creates a platform for examining molecular attachment at a solid interface while retaining access to optical behavior. This combination is particularly relevant to chemical sensing and surface-related measurements.
The modified surface supports studies of adsorption, chemical sensing, and interfacial reactions. Researchers can examine how acids, biomolecules, polymers, or other functional materials associate with the interface, whether through covalent coupling or electrostatic attraction. The resulting surface serves as a controlled setting for connecting molecular attachment behavior with the chemical and optical properties of the quartz substrate.