The Preparation of Specific Adsorbents

Dickey, Frank H.

doi:10.1073/pnas.35.5.227

Cited by 324 publications

(134 citation statements)

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“…It was pointed out already in 1949 by Dickey that porous silica materials prepared in the presence of methylorange specifically adsorb dyes of the same architecture. 22 The approach of imprinting molecules (molecular imprinting) on all It can be seen that the pore system ('inverse matter') has exactly the size and shape expected under the assumption of a 1+1 transformation process. 58 The term nanocasting is justified.…”

Section: Single Polymers and Molecules As Templatesmentioning

confidence: 99%

“…The possibility of transcription of single molecules to pores has already been explored since 1949 with the work of Dikey. 22 Originally, in MCM-materials cationic surfactant systems together with silica-sols under basic conditions were employed. It has in the meantime been accepted that the negatively charged silica precursors (silicic acid and oligomers) interact with the cationic head-groups of the surfactants.…”

Section: Nanocasting and Its Restrictionsmentioning

confidence: 99%

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Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

2002

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Nanocasting, the 3D-transformation of self-assembled organic nanostructures into hollow inorganic replicas under preservation of fine structural details has recently turned out to be a versatile tool, both for the synthesis of porous media with new pore topology as well as for the characterization of the assembled structures themselves. This review gives a review on recent work describing the potential and restrictions of nanocasting using surfactants, polymers, colloids as well as supramolecular tectons as porogens.

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Section: Single Polymers and Molecules As Templatesmentioning

confidence: 99%

Section: Nanocasting and Its Restrictionsmentioning

confidence: 99%

Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

2002

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“…Em 1949, o trabalho de Dickey põe em prática a teoria de Pauling promovendo a utilização de absorventes específicos com memória inerente a uma dada molécula e capazes de se religar seletivamente à mesma [2] . Dessa concepção, idealizou-se produzir um polímero rígido, com seletividade atribuída principalmente a sua estrutura tridimensional complementar à molécula molde, que pudesse atuar de forma similar ao anticorpo, ou seja, que pudesse efetuar seletivamente o reconhecimento molecular [3] .…”

Section: Introductionunclassified

Síntese e caracterização de MIP com fenilalanina visando sua aplicação na técnica de SPE

et al. 2015

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ResumoPolímeros Molecularmente Impressos (MIPs) são polímeros sintéticos que apresentam alta seletividade a uma molécula de interesse. O objetivo deste trabalho foi a síntese e caracterização de MIPs para aplicação na extração em fase sólida (SPE), visando a determinação de fenilalanina. Os MIPs foram sintetizados a partir do MAA, fenilalanina, EGDMA, AIBN, em clorofórmio. Também foi sintetizado o polímero não-impresso (NIP), para controle da seletividade dos MIPs. A dessorção da fenilalanina foi realizada em extrator Soxhlet. Os MIPs e NIP foram caracterizados pelas técnicas de análise: FTIR, UV-Vis, MEV, DSC e TG. O MIP apresentou maior capacidade adsortiva à fenilalanina do que o NIP, com uma taxa média de adsorção de 55% comparada a 11% para o NIP. Por MEV o MIP apresentou superfície mais porosa, importante característica para aplicação em SPE. Os estudos realizados mostraram que o MIP sintetizado apresentou grande potencial para aplicação em técnica de SPE. Palavras-chave: síntese e caracterização, MIP, fenilalanina, extração em fase sólida. AbstractMolecularly imprinted polymers (MIPs) are synthetic polymers that have high selectivity to a molecule of interest. The objective of this work was the synthesis and characterization of MIPs for use in solid phase extraction (SPE), in order to determine Phenylalanine. The MIPs were synthesized from the MAA, Phenylalanine, EGDMA AIBN, in chloroform. Non imprinted polymer (NIP) was synthesized to control the selectivity of MIPs. The desorption of Phenylalanine was carried out in Soxhlet extractor. The MIPs and NIP were characterized by the following analytical techniques: FTIR, UV-Vis, SEM, DSC and TG. MIP showed higher adsorption capacity to Phenylalanine than the NIP with an average rate of adsorption of 55% compared to 11% for NIP. SEM MIP showed more porous surface, an important feature for use in SPE. The synthesized MIP in the present study showed great potential for use in SPE technique.

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“…Because of the low temperature and mild synthetic conditions, molecular dopants that are impossible to add to traditional glasses because of the high melting temperatures can be incorporated in sol-gel-derived materials. Although studies as early as 1949 demonstrated that organic dyes could be incorporated in a silica matrix prepared at room temperature, 1 it was not until the 1980s that systematic studies based on alkoxysilanes began. 2 As interest expanded, the research evolved into two complementary directions: (1) the incorporation of organic molecules as spectroscopic probes of sol-gel chemistry and structure and (2) the development of materials with functional optical properties.…”

Section: Introductionmentioning

confidence: 99%

“…3,4 One of the advantages of the sol-gel process is the versatility of fabricating the materials derived from this process into different forms, including bulk monoliths, fibers, and films. The overall reactions leading to the formation of silica are Si(OR) 4 + 4H 2 O f Si(OH) 4 + 4ROH (1) nSi(OH) 4 f nSiO 2 + 2nH 2 O…”

Section: Introductionmentioning

confidence: 99%

Molecules in Glass: Probes, Ordered Assemblies, and Functional Materials

Dunn

Zink

2007

Acc. Chem. Res.

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Research on the properties and applications of molecules doped into sol-gel-derived silica matrices has expanded rapidly. This Account begins with a brief review of the use of the dopant molecules as probes of the changes that occur as the system evolves from the initial sol to the final xerogel during the formation of monoliths, thin films, and mesostructured films. Methods of deliberately placing desired molecules in specific regions of the mesostructure are discussed, and an application, energy transfer, is presented. Finally, encapsulation of biological molecules is examined, and two important aspects, stabilization of the biomolecules and applications as biosensors, are described.

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The Preparation of Specific Adsorbents

Cited by 324 publications

References 0 publications

Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

Síntese e caracterização de MIP com fenilalanina visando sua aplicação na técnica de SPE

Molecules in Glass: Probes, Ordered Assemblies, and Functional Materials

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