Water-based functionalization of mesoporous siliceous materials, Part 1: Morphology and stability of grafted 3-aminopropyltriethoxysilane

Bauer, Frank; Czihal, Saskia; Bertmer, Marko; Decker, Ulrich; Naumov, Sergej; Wassersleben, Susan; Enke, Dirk

doi:10.1016/j.micromeso.2016.01.046

Cited by 29 publications

(23 citation statements)

References 60 publications

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“…Combined theoretical and experimental techniques have been often used to characterize organo-modified mesoporous silica: for instance, a surface functionalized by aminopropyltriethoxysilane was studied by 29 Si NMR, as well as TGA and ESI-MS, and modelled by DFT calculations, which helped to describe the hydration states of the tethered functional groups. 374 The stability of organo-modified silica, with amines of variable length grafted on the surface, was investigated in a number of different conditions, to evaluate the relation between stability and chain length. Several experimental techniques were employed, among which 13 C ssNMR, and the results supported by ab initio calculations describing the degradation pathways by optimizing reactants, products and possible transition states.…”

Section: Mesoporous Solids For Co2 Adsorptionmentioning

confidence: 99%

Combined solid-state NMR, FT-IR and computational studies on layered and porous materials

et al. 2018

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Understanding the structure-property relationship of solids is of utmost relevance for efficient chemical processes and technological applications in industries. This contribution reviews the concept of coupling three well-known characterization techniques (solid-state NMR, FT-IR and computational methods) for the study of solid state materials which possess 2D and 3D architectures and discusses the way it will benefit the scientific communities. It highlights the most fundamental and applied aspects of the proactive combined approach strategies to gather information at a molecular level. The integrated approach involving multiple spectroscopic and computational methods allows achieving an in-depth understanding of the surface, interfacial and confined space processes that are beneficial for the establishment of structure-property relationships. The role of ssNMR/FT-IR spectroscopic properties of probe molecules in monitoring the strength and distribution of catalytic active sites and their accessibility at the porous/layered surface is discussed. Both experimental and theoretical aspects will be considered by reporting relevant examples. This review also identifies and discusses the progress, challenges and future prospects in the field of synthesis and applications of layered and porous solids.

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Section: Mesoporous Solids For Co2 Adsorptionmentioning

confidence: 99%

Combined solid-state NMR, FT-IR and computational studies on layered and porous materials

et al. 2018

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“…APTS has a highly reactive amino group acting as a primer helping in strong bondage. 43 Covalent immobilization has an advantage of high enzyme stability and a strong bond between the support and enzyme minimizing the leakage issues. Hence, APTS functionalization shows better results as compared to others.…”

Section: Resultsmentioning

confidence: 99%

Chemoenzymatic Epoxidation of Limonene Using a Novel Surface-Functionalized Silica Catalyst Derived from Agricultural Waste

Salvi

Yadav

2020

ACS Omega

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Limonene is one of the most important terpenes having wide applications in food and fragrance industries. The epoxide of limonene, limonene oxide, finds important applications as a versatile synthetic intermediate in the chemical industry. Therefore, attempts have been made to synthesize limonene oxide using eco-friendly processes because of stringent regulations on its production. In this regard, we have attempted to synthesize it using a cost-effective and eco-friendly process. Chemoenzymatic epoxidation of limonene to limonene oxide was carried out using in situ generation of peroxy octanoic acid from octanoic acid and H 2 O 2 . In this study, agricultural-waste rice husk ash (RHA)-derived silica was surface-functionalized using (3-aminopropyl) triethoxysilane (APTS), which was cross-linked using glutaraldehyde for immobilization of Candida antarctica lipase B. Furthermore, the immobilized enzyme was entrapped in calcium alginate beads to avoid enzyme leaching. Thus, limonene oxide was prepared using this catalyst under conventional and microwave heating. The microwave irradiation intensifies the process, reducing the reaction time under the same conditions. Maximum conversion of limonene to limonene oxide of 75.35 ± 0.98% was obtained in 2 h at 50 °C using a microwave power of 50 W. In the absence of microwave irradiation, the conventional heating gave 44.6 ± 1.14% conversion in 12 h. The reaction mechanism was studied using the Lineweaver–Burk plot, which follows a ternary complex mechanism with inhibition due to peroxyoctanoic acid (in other words H 2 O 2 ). The prepared catalyst shows high reusability and operational stability up to four cycles.

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“…In this work, we synthesized a polythiophene derivative with disiloxane moieties in the side chains attached to thiophene rings (P3SiT) as shown in Figure and investigated its mechanical and electrical properties. The SiO bond distance in disiloxane in the side chains (1.66 Å) is longer than the CC bonding distance in hydrocarbon side chains (1.54 Å). Moreover, the low rotation barrier of SiOSi bonding (3.3 kJ mol −1 ) is comparable to the free rotation energy.…”

Section: Introductionmentioning

confidence: 86%

“…[4,5] Extensive investigations of P3ATs, which are one of the "element-block" polymers, [6] have revealed that their structures and properties can be changed using various chemical synthetic processes. [7][8][9] In particular, from the viewpoint of the chemical structure of P3ATs, long alkyl side www.advancedsciencenews.com www.mcp-journal.de in disiloxane in the side chains (1.66 Å) [19] is longer than the CC bonding distance in hydrocarbon side chains (1.54 Å). Moreover, the low rotation barrier of SiOSi bonding (3.3 kJ mol −1 ) [20] is comparable to the free rotation energy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Thermal, and Electrical Properties of Flexible Polythiophene with Disiloxane Side Chains

Shen

Fujita

Matsumoto

et al. 2017

Macro Chemistry & Physics

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Poly(3‐hexylthiophene) (P3HT) is widely shown to have considerable advantages in photovoltaic cells, including excellent electrical performance, but its fragility remains a challenge for material applications and processing of stretchable devices. Herein, high‐molecular‐weight and highly regioregular poly(3‐substituted thiophene) with disiloxane moieties in the side chains (P3SiT) is synthesized. An investigation of the molecular structure and physical properties of self‐supported cast films of P3SiT reveals excellent flexible mechanical properties derived from the disiloxane groups in the side chains. The larger fracture strain reaches over 200% compared with that of poly(3‐hexylthiophene) (14%). In addition, its Young's modulus (43 MPa) and low glass transition temperature (−10 °C) result in a typical elastic mechanical property. For the electrical property, the sheet resistivity of the drawn thiophene polymer shows the value almost equal to that of poly(3‐hexylthiophene). The anisotropy of electrical resistivity is observed due to orientation of the drawn polymer.

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Water-based functionalization of mesoporous siliceous materials, Part 1: Morphology and stability of grafted 3-aminopropyltriethoxysilane

Cited by 29 publications

References 60 publications

Combined solid-state NMR, FT-IR and computational studies on layered and porous materials

Combined solid-state NMR, FT-IR and computational studies on layered and porous materials

Chemoenzymatic Epoxidation of Limonene Using a Novel Surface-Functionalized Silica Catalyst Derived from Agricultural Waste

Mechanical, Thermal, and Electrical Properties of Flexible Polythiophene with Disiloxane Side Chains

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