Results 121 to 130 of about 2,767,015 (326)

MICROSTRUCTURE AND DENSIFICATION BEHAVIOUR OF SURFACE­ COATED SILICON NITRIDE POWDER

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2002
For better control of the mechanical properties of Si3N4 ceramics, it is necessary to generate homogeneous nıicrostructures, and for this purpose, chemical heterogeneities must be minimised, by careful control of pO\\'der processing and the subsequent ...
Zafer Tatlı
doaj   +1 more source

Notizen: Ungewöhnliche Struktureinheiten in gemischten Metall-Alkoxid-Chloriden / Unusual Structural Units in Mixed Metal Alkoxide Chlorides

Zeitschrift für Naturforschung B, 1995
As found by X-ray structure analysis (tBuO)4AlSnCl (1) is monomeric in the crystal and has a central AlO2Sn four-membered ring (Sn -O 2,153(5) Å , Al-O 1,807(7)Å). The corresponding iso-propyl derivative 2 reacts with SnCl2 to yield a coordination polymer (iPrO)4AlSn2Cl3 3 incorporating a new trigonal bipyramidal Sn2Cl3 + cation ...
Michael Veith, Holger Wolfanger, Volker Huch   +2 more
openaire   +1 more source

From Molecule to Material: How Support Changes Heterobimetallic Catalysts in Lactide Polymerization

Macromolecular Rapid Communications, EarlyView.
Silica‐supported heterobimetallic alkoxide complexes were developed as catalysts for lactide ring‐opening polymerization. Grafting iron‐based ate complexes onto SiO2‐700 produced well‐defined active sites, enabling controlled polymerization with predictable molar masses, narrow dispersities, and recyclability.
Fan Yang, Yahaya Nasiru, Abdulrahman Adamu Isah, Aimery de Mallmann, Mostafa Taoufik, Régis M. Gauvin, Christophe M. Thomas   +6 more
wiley   +1 more source

Preparation of hydroxycinnamic acid and hydroxycinnamate from herbal lignin in aprotic solvent under mild conditions

Industrial Crops and Products
Herbaceous (grass-type) lignin is characterized by a high content of hydroxycinnamic acid, which are typically ester-linked to the γ-position of the lignin side chains.
Siqi Huang, Xu Zeng, Qiqi Dai, Minjie Hou, Chuanfu Liu, Jun Xie, Wu Lan   +6 more
doaj   +1 more source

Diversity of Coordination Modes in a Flexible Ditopic Ligand Containing 2-Pyridyl, Carbonyl and Hydrazone Functionalities: Mononuclear and Dinuclear Cobalt(III) Complexes, and Tetranuclear Copper(II) and Nickel(II) Clusters

Magnetochemistry, 2019
Syntheses, crystal structures and characterization are reported for four new complexes [Cu4Br2(L)4]Br2 (1), [Ni4(NO3)2(L)4(H2O)](NO3)2 (2), [Co2(L)3](ClO4)3 (3) and [Co(L)2](ClO4) (4), where L− is the monoanion of the ditopic ligand N′-(1 ...
Evangelos Pilichos, Evangelos Spanakis, Evangelia-Konstantina Maniaki, Catherine P. Raptopoulou, Vassilis Psycharis, Mark M. Turnbull, Spyros P. Perlepes   +6 more
doaj   +1 more source

Structural features and reactivity of (sparteine)PdCl_2: a model for selectivity in the oxidative kinetic resolution of secondary alcohols [PDF]

, 2008
The chiral ligand (−)-sparteine and PdCl_2 catalyze the enantioselective oxidation of secondary alcohols to ketones and thus effect a kinetic resolution.
Stoltz, Brian M., Trend, Raissa M.
core   +2 more sources

Rapid Epoxy Polymerization Induced by Aliphatic Cyclic Tertiary Amines: The Roles of Nucleophilicity and Leaving Ability

Macromolecular Rapid Communications, EarlyView.
Quinuclidine, as a tertiary amine, can rapidly polymerize epoxy groups. We investigated the relationship between amine properties and polymerization behavior by monitoring the reactions of various tertiary amines with epoxy groups. The results indicate that quinuclidine, the most nucleophilic amine examined, promotes epoxy polymerization.
Yukai Ito, Daisuke Aoki, Koji Arimitsu
wiley   +1 more source

Two dimensional crystals in three dimensions: electronic decoupling of single-layered platelets in colloidal nanoparticles

, 2018
Two-dimensional crystals, single sheets of layered materials, often show distinct properties desired for optoelectronic applications, such as larger and direct band gaps, valley- and spinorbit effects. Being atomically thin, the low amount of material is
Beal, Besenbacher, Brown, Brown, Bruix, Coleman, Förster, Grønvold, Helveg, Hulliger, Jeong, Jin, Jing, Jing, Jung, Kjekshus, Kuc, Li, Liu, Luo, Mak, Miro, Miró, Nicolosi, Novoselov, O'Brien, Ogata, Ono, Sangian, Sarkar, Splendiani, Srivastava, Tan, Wang, Wang, Yang, Yim, Yim, Yoo, Zhang, Zhang, Zhu, Zibouche, Zibouche   +43 more
core   +1 more source

Schiff based derived homogeneous catalysts for ring‐opening terpolymerization

Polymer International, EarlyView.
One‐pot synthesis of degradable terpolymers from l‐lactide, propylene oxide and CO₂ using diverse catalysts is described, revealing structure–property relationships for tailored applications in sustainable materials. Abstract In this study, we synthesized and evaluated a series of Schiff base cobalt catalysts for the terpolymerization of propylene ...
Akanksha Ranade, Amjad Ali, Rajeev Mehta
wiley   +1 more source

Dental composites: a comprehensive review on formulation, properties and recent developments

Polymer International, EarlyView.
Dental composites are essential in modern restorative dentistry; this review covers their development, composition, key properties and recent advances, highlighting new technologies for optimizing materials and improving clinical outcomes. Abstract Dental composites have evolved considerably since their introduction, becoming the cornerstone of modern ...
Rayenne Latoui, Djallel Bouzid, Olivier Boyron   +2 more
wiley   +1 more source