Different types of titanosilicates are synthesized, structurally characterized, and subsequently catalytically tested in the liquid-phase epoxidation of cyclohexene. The performance of three types of combined zeolitic/mesoporous materials is compared with that of widely studied Ti-grafted-MCM-41 molecular sieve and the TS-1 microporous titanosilicate. The catalytic test results are correlated with the structural characteristics of the different catalysts. Moreover, for the first time, immersion calorimetry with the same substrate molecule as in the catalytic test reaction is applied as an extra means to interpret the catalytic results. A good correlation between catalytic performance and immersion calorimetry results is found. This work points out that the combination of catalytic testing and immersion calorimetry can lead to important insights into the influence of the materials structural characteristics on catalysis. Moreover, the potential of using immersion calorimetry as a screening tool for catalysts in epoxidation reactions is shown.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/la104808v | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Biodegradation and Thermomechanical Behavior of 3D-Printed PLA Scaffolds Under Static and Stirring Biomimetic Conditions.
Biomimetics (Basel)
December 2024
Department of Mechanical Engineering and Aeronautics, University of Patras, 26504 Patras, Greece.
3D-printed biomedical polylactic acid (PLA) scaffolds were developed, and their biodegradation, as well as their thermomechanical behavior, were studied in a relevant in vitro environment. The scaffold's biodegradability profile has been monitored after immersion in a cell culture medium that contains components of blood and body fluids. Two types of biodegradation experiments were performed-a standard static one and an adapted stirring one, mimicking the body fluids' flow, respectively-to achieve a comparative investigation.
View Article and Find Full Text PDFComparison of physical, mechanical, and optical properties between thermoplastic materials and 3-dimensional printing resins for orthodontic clear retainers.
Am J Orthod Dentofacial Orthop
January 2025
School of Materials Science and Innovation, Faculty of Science, Mahidol University, Nakhon Pathom, Thailand. Electronic address:
Introduction: This study investigated the physical, mechanical, and optical properties of 3-dimensional (3D) printing resins compared with thermoplastic materials to evaluate their suitability for the fabrication of orthodontic clear retainers.
Methods: Samples were prepared from thermoplastic sheets (Duran [Scheu-Dental GmbH, Iserlohn, Germany] and Zendura [Bay Materials LLC, Fremont, Calif]) and biocompatible 3D-printing resins (Dental LT Clear V2 [Formlabs Inc, Somerville, Mass] and OrthoFlex [Nextdent BV, Soesterberg, The Netherlands]) according to the manufacturer's instructions. The materials were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, and water sorption tests.
Preparation of a Novel Composite Coating of APP/MMT/APTES on Polyurethane with Improved Flame-Retarding Performance.
ACS Omega
December 2024
State Key Laboratory of Chemical Engineering, School of Chemical Engineering East China University of Science and Technology (ECUST), Shanghai 200237, China.
An environmentally friendly flame retardant coating for polyurethane composed of ammonium polyphosphate(APP)/montmorillonite(MMT)/(3-aminopropyl)triethoxysilane(APTES) has been prepared by deposition on a polyurethane surface through a one-step immersion, enhancing its flame retardancy. The coating of APP/MMT/APTES on the polyurethane sample surface has been verified from XPS and FTIR analysis. In comparison to untreated polyurethane, the amount of char residue after combustion of the flame-retardant polyurethane increases significantly, with a 50.
View Article and Find Full Text PDFConstructing and characterization of cyclodextrin metal organic framework and soybean hull polysaccharide polymer composite carriers: Enhancing curcumin delivery.
Food Chem
December 2024
College of Food Science and Technology, Bohai University, Jinzhou, 121013, China; Grain and Cereal Food Bio-efficient Transformation Engineering Research Center of Liaoning Province, Jinzhou, 121013, China.
This study aims to create composite carriers by combining cyclodextrin metal organic frameworks (CD-MOFs) with soybean hull polysaccharide (SHP) polymers for enhanced performance. A cubic structured composite carrier was successfully synthesized, exhibiting potential for delivering functional factors. Interaction between cyclodextrin (CD) and SHP was predominantly driven by hydrogen bonding forces, as evidenced by Fourier transform infrared spectroscope (FTIR), Raman spectroscopy.
View Article and Find Full Text PDFEvaluation of Admixture Silane Added into Cementitious Pastes.
Materials (Basel)
November 2024
Academic Department of Civil Construction (DACOC), Technological Federal University of Paraná (UTFPR), Curitiba 81280-340, PR, Brazil.
This manuscript evaluated the performance of silanes in cementitious matrices in the partial replacement of superplasticizers by silanes. For this, pastes with a water/cement ratio of 0.186 were produced and the superplasticizer admixture based on polycarboxylate esters was partially substituted by three types of silanes-vinyltriethoxysilane silanes (VTES), n-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTMS), and methacryloxypropyltrimethox-ysilane (MCPTMS)-in two substitutions levels (20% and 40%), and then tested in Portland cement pastes.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!