Manoharan, Partheban; Anagha, M. G.; Das, Narayan Chandra; Naskar, Kinsuk
Influence of different specific surface area of highly dispersible silica and interfacial characteristics of green elastomer composites
Epoxidized natural rubber (ENR) is a modified form of NR bearing polar epoxy groups. The present study focuses on dispersion of highly dispersible silica (HDS) filler with three different specific surface areas in ENR 25/ENR 50 composites. The effect of three different specific surface areas of HDS on bound rubber…
Influence of Boron Nitride Nanosheets on the Crystallization and Polymorphism of Poly(l-lactide)
Rosely, C. V. Sijla; Nagendra, Baku; Sivaprasad, Vijayan Pillai; Gowd, E. Bhoje
This work reports on the impact of delaminated boron nitride nanosheets (BNNSs) on the crystallization behavior and crystalline structure of melt-crystallized poly-L-lactic acid (PLLA). Wide-angle X-ray diffraction and scanning electron microscopy data revealed that the addition of lower loadings of BNNSs (∼0.5 wt %) resulted in the highly dispersed PLLA…
Influence of an external magnetic field in the two-photon absorption coefficient of magnetite nanoparticles in colloids and thin films
Espinosa, D. H. G.; Oliveira, C. L. P.; Neto, A. M. Figueiredo
The Z-scan nonlinear optical and the small-angle x-ray scattering (SAXS) techniques are used to investigate the structure and nonlinear optical properties of magnetite nanoparticles dispersed in a colloid and trapped in thin films. The nonlinear refractive index (n2) and the two-photon absorption coefficient (β) were measured as a function of…
Immobilization of the enzyme invertase in SBA-15 with surfaces functionalized by different organic compounds
Ribeiro, Livia M. O.; Falleiros, Larissa N. S. S.; de Resende, Miriam M.; Ribeiro, Eloízio J.; Almeida, Renata M. R. G.; da Silva, Antonio O. S.
The search for appropriate supports for enzyme immobilization has attracted increasing interest in the field of biocatalysis. Immobilized enzymes are catalysts of enormous industrial interest because they combine the advantages of heterogeneous catalysis with the high selectivity and mild operational conditions of enzymes. This study evaluated the use of different…
Hyperbranched poly(amido amine) demulsifiers with ethylenediamine/1,3-propanediamine as an initiator for oil-in-water emulsions with microdroplets
Zhang, Lifeng; Ying, Hao; Yan, Shu; Zhan, Ningning; Guo, Yongsheng; Fang, Wenjun
Two kinds of hyperbranched poly(amido amine) (h-PAMAM) with abundant terminal amine groups are synthesized to break the oil-in-water (O/W) emulsions consisting of microdroplets. The demulsification performance of h-PAMAM is systematically evaluated with assistance of UV–vis spectra, micrograph, DLS and SAXS analyses. The demulsifier with 1,3-propanediamine as initiator shows a striking…
High-performance polyimide copolymer fibers derived from 5-anino-2-(2-hydroxy-4-aminobenzene)-benzoxazole: Preparation, structure and properties
Dai, Xuemin; Bao, Feng; Jiao, Long; Yao, Haibo; Ji, Xiangling; Qiu, Xuepeng; Men, Yongfeng
A series of high-performance polyimide copolymer (co-PI) fibers containing phenylenebenzoxazole moiety with one hydroxyl group are synthesized based on the copolymerization of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA) with two diamine monomers, namely, p-phenylenediamine (p-PDA) and 5-anino-2-(2-hydroxy-4-aminobenzene)-benzoxazole (p-mHBOA), through a two-step method. The molar ratio…
Highly Selective Continuous Flow Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol in a Pt/SiO2 Coated Tube Reactor
Bai, Yang; Cherkasov, Nikolay; Huband, Steven; Walker, David; Walton, Richard; Rebrov, Evgeny;
A novel continuous flow process for selective hydrogenation of α, β-unsaturated aldehyde (cinnamaldehyde, CAL) to the unsaturated alcohol (cinnamyl alcohol, COL) has been reported in a tube reactor coated with a Pt/SiO2 catalyst. A 90% selectivity towards the unsaturated alcohol was obtained at the aldehyde conversion of 98.8%. This is…
High internal vegetable oil nanoemulsion: D-phase emulsification as a unique low energy process
Yukuyama, Megumi Nishitani; Oseliero, Pedro Leonidas Filho; Kato, Edna Tomiko Myiake; Lobënberg, Raimar; de Oliveira, Cristiano Luis Pinto; de Araujo, Gabriel Lima Barros; Bou-Chacra, Nadia Araci
The development of nanoscale emulsions containing high concentration of vegetable oil and low concentration of surfactant is considered challenging in conventional low-energy processes such as the Phase Inversion Temperature (PIT) and Phase Inversion Composition (PIC) methods. For the first time, a stable 20–30 nm oil-in-water nanoemulsion, containing 40.0% (w/w) olive oil…
Gyroidal Porous Carbon Activated with NH3 or CO2 as Lithium−Sulfur Battery Cathodes
Krüner, Benjamin; Dörr, Tobias S.; Shim, Hwirim; Sann, Joachim; Janek, Jürgen; Presser, Volker
Ordered mesoporous carbon materials, prepared from co-assembly of a block copolymer and a commercial resol, were investigated as a sulfur host for LiS-battery cathodes. We studied two activation methods for such carbons, namely annealing in ammonia (NH3) and carbon dioxide (CO2). We found that both activation environments drastically increased the…
On the colloidal stability of apolar nanoparticles: The role of particle size and ligand shell structure
Kister, Thomas; Monego, Debora; Mulvaney, Paul; Widmer-Cooper, Asaph; Kraus, Tobias
Being able to predict and tune the colloidal stability of nanoparticles is essential for a wide range of applications, yet our ability to do so is currently poor due to a lack of understanding of how they interact with one another. Here, we show that the agglomeration of apolar particles…