Abstract In recent years, the synthesis and applications of magnetic nanoparticles (MNPs) have attracted increasing interest in catalysis research, MNP‐derived catalysts been employed such industrially important reactions as hydrogenation, hydroformylation, Suzuki–Miyaura Heck couplings, olefin metathesis. The hybrid nanocomposite species display sustainable catalytic activities great advantages concerning catalyst recycling processes. A number examples using these innovative hybrids...

A novel biomass-based nitrogen-doped free-standing fused carbon fibrous mat was fabricated from lignin–polyethylene oxide (PEO) (90:10) blend via electrospinning followed by carbonization and thermal annealing in the presence of urea. The morphology structure fibers were characterized field-emission scanning electron microscopy, Raman spectroscopy, X-ray photoelectron elemental analysis, their electrochemical properties investigated for first time as anode lithium ion batteries (LIBs)....

Novel peapod-like Co@carbon and Co(3)O(4)@carbon composite nanostructures have been successfully fabricated for the first time based on rational design elaborate analyses. The exhibit unique feature of Co or Co(3)O(4) nanoparticles (20 nm) encapsulated inside well-graphitized carbon layers coating outside. intriguing morphologies, architectures, chemical compositions. What is more important, compositions will lead to perfect performances in many applications. In this paper, a good example...

Lignin-based polyurethane elastomers (LPUe) with high stiffness, strength, and toughness were facilely prepared by direct cross-linking of unfunctionized lignin as hard segments poly(propylene glycol) tolylene 2,4-diisocyanate terminated (PPGTDI) soft domains. The effects molecular weight (3600 600 g mol–1) fraction (5–40 wt %) on the thermal mechanical properties LPUe studied. With an increase in content, exhibited improved stability, glass transition temperature (Tg) also increased,...

We report one-pot synthesis of Fe(III)–polydopamine (PDA) complex nanospheres, their structures, morphology evolution, and underlying mechanism. The nanospheres were synthesized by introducing ferric ions into the reaction mixture used for polymerization dopamine. It is verified that both oxidative dopamine Fe(III)–PDA complexation contribute to "polymerization" process, in which form coordination bonds with oxygen nitrogen, as indicated X-ray absorption fine-structure spectroscopy. In...

Isomerically pure exo-norbornene esters containing either a PdII SCS pincer complex or diaminopyridine unit were synthesized, polymerized, and copolymerized by ring-opening metathesis polymerization using ruthenium initiator. All polymerizations are living under mild reaction conditions. A comparison between the exo monomers commonly employed 80:20 endo/exo mixtures was carried out. The isomers exhibit significantly higher rates of propagation milder conditions when compared to mixtures....

Wettability alteration was proposed as one of the enhanced oil recovery (EOR) mechanisms for nanoparticle fluid (nanofluid) flooding. The effect adsorption on wettability investigated by index measurement Berea sandstone core injected with nanofluids and contact angle a glass surface treated nanofluids. Nanoparticle studied single phase coreflooding in sandstone. isotherm impact effective permeability were measuring effluent concentration differential pressure across core. Results showed...

The stability of nanoparticles at reservoir conditions is a key for successful application nanofluids any oilfield operations, e.g., enhanced oil recovery (EOR). It has, however, remained challenge to stabilize under high salinity and temperature longer duration (at least months). In this work, we report surface modification commercial silica by combination zwitterionic hydrophilic silanes improve its conditions. To evaluate thermal stability, static accelerated analyses methods were...

A novel methodology for random copolymer functionalization based on a noncovalent, one-step, multifunctionalization strategy has been developed. Random copolymers possessing both palladated-pincer complexes and diaminopyridine moieties (hydrogen-bonding entities) have synthesized using ring-opening metathesis polymerization. Noncovalent of the resultant is accomplished via (1) directed self-assembly, (2) multistep (3) one-step orthogonal self-assembly. This system shows complete specificity...

A reversible cellulose binding agent, 1-(4′-(4′′-(2′′′-boronobenzyl)piperazinyl)-2′-butenyl)-3-n-butylimidazolium chloride 1, is synthesized by reacting 2-((4′-allylpiperazinyl)methyl) phenylboronic acid with 3-allyl-1-n-butylimidazolium chloride. 1 miscible ionic liquids, and when combined Ru nanoparticles as a catalyst, can be converted to polyols under mild conditions. The catalyst recycled sustained activity. Biomass has recently attracted wide interest because it recognized candidate...

A novel route to lignin epoxy composites is developed through covalent incorporation of depolymerized epoxide into amine‐cured matrix. The partially first epoxidized with epichlorohydrin and the resultant shows decreased solubility in common organic solvents. When dispersed matrix cured, integrated networks form submicron aggregates. resulting show improved mechanical properties compared neat epoxy. At a loading content 1.0 wt% degraded epoxide, Young's modulus critical stress intensity...

The synthesis and characterization of bulky diphosphine 1,2-bis(4-phosphorinone)xylene, BPX, its palladium complexes [(BPX)PdCl2] [(BPX)Pd(O2CCF3)2] are described. BPX was evaluated as a ligand in Pd-catalyzed isomerizing methoxycarbonylation. A broad range alkenes, including terminal, internal, branched, functionalized can be converted to esters with activities selectivities matching or surpassing the performance state-of-the-art bis(di(tert-butyl)phosphino-o-xylene (Pd-DTBPX) catalyst....

Ruthenium(<sc>ii</sc>) NHC complexes give rise to highly active and selective ruthenium nanoparticles for the conversion of levulinic acid γ-valerolactone in water.

Abstract Polymers containing terminal hydrogen‐bonding recognition motifs based on diaminotriazine and diaminopyridine groups in their side chains for the self‐assembly of appropriate receptors have been prepared by ring‐opening metathesis polymerization (ROMP) norbornenes. A new synthetic method preparation norbornene monomers pure alkyl spacers is introduced. These show unprecedented high reactivity using ROMP. To suppress self‐association diaminotriazine‐based polymers, polymerizations...

To be effective enhanced oil-recovery (EOR) agents, nanoparticles must stable and transported through a reservoir. However, the stability of nanoparticle suspension at reservoir salinity temperature is still challenge how it affected by rocks crude oils not well understood. In this work, for first time, effect several treatment approaches on silica conditions (in presence rock oil) was investigated EOR applications. The suspensions screened in test tubes 70 °C 3.8 wt. % NaCl oil. Fumed with...

Abstract The Hoveyda–Grubbs catalyst has been successfully immobilized on surface‐modified magnetic nanoparticles with a loading amount of 0.28 mmol ruthenium/g (magnetic support). supported catalysts were active for the self‐metathesis methyl oleate and macro‐monomer in quantitative conversion, respectively. In addition, can be easily separated by using magnet reused several times sustained activity.

Abstract Tailor made N ‐heterocyclic carbene (NHC) catalyst precursors namely (+) and (−) 1‐methyl‐3‐menthoxymethyl imidazolium chloride have been synthesized in high yield with a literature modified procedure. A reaction of precursor potassium tert butoxide situ generates the NHC catalyst. The zwitterionic ring opening polymerization lactide (LA) mediated by catalytic system composed at 25°C under argon atmosphere led to cyclic poly(lactide) molecular weight narrow distribution. was...

A series of sterically bulky diphosphines have been prepared, including P2 = trans-1,2-bis[(di-tert-butylphosphino)methyl]cyclohexane (4), (2-methylenepropane-1,3-diyl)bis(di-tert-butylphosphine) (5), bis[(di-tert-butylphosphino)methyl]dimethylsilane (6), and cis- trans-11,12-bis[(di-tert-butylphosphino)methyl]-9,10-dihydro-9,10-ethanoanthracene (10 11). The corresponding palladium complexes these ligands, P2Pd(CF3CO2)2, synthesized characterized. solid-state structures [Pd(4)(CF3CO2)2],...

Abstract It is demonstrated that pristine or functionalized lignin can be used in epoxy as a cohardener comonomer; however either unsatisfactory mechanical properties low content remains challenge utilizing the sustainable biomass to replace petrochemical product. In this study, carboxylic acid‐modified kraft (lignin–COOH) synthesized and for with loading of up 10.0 wt%. With incorporation wt% lignin–COOH, resulting composite exhibits increments 16%, 13%, 20%, 95% on tensile modulus,...

Abstract The acid catalyzed reactive distillation of γ‐valerolactone yields pentenoic acids (PEAs) which can be obtained in &gt;90 % purity and &gt;97 selectivity. PEAs (five isomers) converted into a number useful products with commercial relevance. hydroxycarbonylation adipic (a Nylon monomer) very high selectivity good activity. Self‐metathesis C6 – C8 unsaturated dicarboxylic after hydrogenation produces mixture acid, pimelic suberic acid. If the are first subjected to ethenolysis;...

The palladium-catalyzed conversion of (bio)pentenoic acid isomers (PEAs) occurs with high activity and selectivity to adipic (ADA) in the presence diphosphine ligand L2 = 1,2-bis[(di-tert-butyl)phosphinomethyl]benzene (DTBPX) an cocatalyst. Using density functional theory (DFT) calculations, we show that active catalyst ([L2PdII-H]+) isomerizes PEAs their equilibrium mixture, from which selective carbonylation hydrolysis results ADA product. Hydrolysis is rate-limiting also...

Summary Most emulsions are thermodynamically unstable and will lose their effectiveness once the emulsion droplets experience creaming or coalescence, which constrains potential further wide application. Therefore, finding a stable system is important. In this work, systematic study was carried out on use of an oil-in-water (O/W) Pickering stabilized by sodium (Na)-montmorillonite particles. The particle-size distribution zeta Na-montmorillonite particle solutions at 0 to 20 wt% chloride...