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ApplicationCatalystsCharacterizationCustomer publicationsInorganic materialsMaterialNanoparticles & colloidsParticle size and size distributionParticlesPhase analysisPorous materialSAXSTechnique

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…
12 March 2019
Customer publications

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…
12 March 2019
Customer publications

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…
12 March 2019
Customer publicationsPhase analysisPorous materialSAXSStructural biology

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…
12 March 2019
Customer publications

A multi-scale investigation on effects of hydrogen bonding on micro-structure and macro-properties in a polyurea

Li, Ting; Zhang, Cheng; Xie, Zhining; Xu, Jun; Guo, Bao-Hua

Effects of hydrogen bonding on the micro-structure development and mechanical properties of a bulk-polymerized Polyurea are systematically investigated from the perspective of temperatures. A two-stage temperature dependence of bidentate hydrogen bonding among hard domains, namely, slight dissociation from 85 °C to 165 °C and dramatic destruction above 165 °C, are revealed by Fourier…
12 March 2019
Customer publications

A sumatriptan coarse-grained model to explore different environments: interplay with experimental techniques

Wood, Irene; Albano, Juan M. R.; Filho, Pedro L. O.; Couto, Veronica Muniz; de Farias, Marcelo A.; Portugal, Rodrigo V.; de Paula, Eneida; Oliveira, Cristiano L. P.; Pickholz, Monica

In this work, we developed a coarse-grained model of sumatriptan suitable for extensive molecular dynamics simulations. First, we confirmed the interfacial distribution of this drug in bilayers through cryogenic transmission electron microscopy and small-angle X-ray scattering techniques, as was predicted by our previous atomistic simulations. Based on these simulations, we…
12 March 2019
Customer publications

A temperature-responsive supramolecular hydrogel: preparation, gel–gel transition and molecular aggregation

Wang, Lin; Shi, Xuefeng; Wang, Jinben

In this study, a novel supramolecular hydrogel, abbreviated as AGC16/NTS, was designed and constructed by the molecular self-assembly of a cationic gemini surfactant, 1,3-bis(N,N-dimethyl-N-cetylammonium)-2-propylacrylatedibromide (AGC16), and an anionic aromatic gelator, trisodium 1,3,6-naphthalenetrisulfonate (NTS). The AGC16/NTS hydrogel was able to form in a mass ratio range of AGC16 and NTS…
12 March 2019
Customer publications

Aerogels of hierarchically porous syndiotactic polystyrene with a dielectric constant near to air

Joseph, Angel Mary; Nagendra, Baku; Shaiju, P.; Surendran, K. P.; Gowd, E. Bhoje

Herein ultralow density aerogels are developed through a feasible freeze casting technique. Briefly, the syndiotactic polystyrene (sPS) gel was prepared using xylene and subjected to successive steps of solvent exchange using non-solvents like ethanol and water. These samples were freeze-dried to obtain aerogels of the same shape and size as…
12 March 2019
Customer publications

Acceleratory and inhibitory effects of uniaxial tensile stress on the photo-oxidation of polyethylene: Dependence of stress, time duration and temperature

Liu, Qiang; Yang, Heng; Zhao, Jincan; Liu, Shixiang; Xia, Lei; Hu, Ping; Lv, Yadong; Huang, Yajiang; Kong, Miqiu; Li, Guangxian

The photo-oxidation behavior of high density polyethylene (HDPE) subjected to uniaxial tensile stress is investigated at various temperatures, tensile stress levels and time durations. The effect of stress on the photo-oxidation rate of HDPE is found to be non-monotonous. Tensile stress is found to play distinctly different roles, namely showing…
12 March 2019
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsFractal dimensionMaterialPolymer researchSAXSTechniqueWAXS

Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

Zorn, Reiner; Yin, Huajie; Lohstroh, Wiebke; Harrison, Wayne; Budd, Peter M.; Pauw, Brian R.; Böhning, Martin; Schönhals, Andreas

Polymers with intrinsic microporosity are promising candidates for the active separation layer in gas separation membranes. Here, the vibrational density of states (VDOS) for PIM-1, the prototypical polymer with intrinsic microporosity, is investigated by means of inelastic neutron scattering. The results are compared to data measured for a more conventional…
12 March 2019