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8.860 Aktuelle Fachpublikationen zum Thema temperature

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A comparative approach to the most sustainable protocol for the [small beta]-azidation of [small alpha],[small beta]-unsaturated ketones and acids

21.10.2014 | John Andraos; Eleonora Ballerini; Luigi Vaccaro, Green Chemistry, 2014

In this contribution we have used green metrics analysis to compare the material efficiency, environmental impact, and safety-hazard impact in order to compare flow and batch procedures for azidation of α,β-unsaturated carbonyls. It has been proved that flow protocols possess a greener profile ...

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Numerical modeling of multilayer film coextrusion with experimental validation

18.10.2014 | James Champion, M. Kieran Looney, Mark J.H. Simmons, Polymer Engineering and Science, 2014

Computational fluid dynamics (CFD) using a finite volume technique and the volume of fluid method of interface tracking is used to model the production of polyester‐based multilayered films via coextrusion. Experimental methods encompass both overall flow validation and secondary layer thickness ...

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Three‐Dimensional Coupled Fluid–Droplet Model for Atmospheric Pressure Plasmas

16.10.2014 | Muhammad M. Iqbal, Charlie P. Stallard, Denis P. Dowling, Miles M. Turner, Plasma Processes and Polymers, 2014

A 3D coupled fluid–droplet model is developed specifically to characterize the significance of droplet‐plasma interaction at atmospheric pressure. The liquid droplet introduces a perturbation in atmospheric pressure plasma (APP) and under many conditions, the behavior of this perturbation is ...

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Laser-induced photo-polymerisation for creation of paper-based fluidic devices

15.10.2014 | C. L. Sones; I. N. Katis; P. J. W. He; B. Mills; M. F. Namiq; P. Shardlow; M. Ibsen; R. W. Eason, Lab on a Chip, 2014

Paper-based microfluidics is a rapidly progressing inter-disciplinary technology driven by the need for low-cost alternatives to conventional point-of-care diagnostic tools. For transport of reagents/analytes, such devices often consist of interconnected hydrophilic fluid-flow channels that are ...

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Practical preparation of challenging amides from non-nucleophilic amines and esters under flow conditions

15.10.2014 | Jesus Alcazar; Wim De Borggraeve; Johannes L. Vrijdag; Nerea Alonso; Natalia Perez-Macias; Francisca Delgado, Chemical Communication, 2014

A fast and efficient protocol for the formation of amides from low nucleophilic amines and esters in flow is described. Products were obtained in good to excellent yields and with the advantage of simultaneous mixing of all reagents at once, avoiding steps for intermediate formation. The protocol ...

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Stop Flow Lithography in Perfluoropolyether (PFPE) Microfluidic Channels

15.10.2014 | Patrick Doyle; Ki Wan Bong; Jiseok Lee, Lab on a Chip, 2014

Stop Flow Lithography (SFL) is a microfluidic-based particle synthesis method for creating anisotropic multifunctional particles with applications that range from MEMs to biomedical engineering. Polydimethylsiloxane (PDMS) has been typically used to construct SFL devices as the material enables ...

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Three-dimensional brain-on-a-chip with an interstitial level of flow and its application as an in vitro model of Alzheimer’s disease

15.10.2014 | JiSoo Park; Bo Kyeong Lee; Gi Seok Jeong; Jung Keun Hyun; Changjoon Justin Lee; Sang-Hoon Lee, Lab on a Chip, 2014

There has been a growing need for in vitro models of neurodegenerative diseases such as Alzheimer’s disease that would enable a better understanding of etiology and faster development of treatment strategies. However, meeting this demand has been held back by the limited ability to mimic the in ...

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Nanofluidic direct formic acid fuel cell with combined air-breathing and dissolved oxygen cathode for high performance

14.10.2014 | E. Ortiz-Ortega; Marc-Antoni Goulet; Jin Wook Lee; M Guerra-Balcázar; Noé Arjona; Erik Kjeang; J. Ledesma-García; L. ..., Lab on a Chip, 2014

The use of three-dimensional flow-through nanoporous electrodes was explored and successfully applied in a formic acid air-breathing nanofluidic fuel cell. The effects of fuel concentration, reaction stoichiometry and catalyst mass loading were investigated resulting in power densities ranging ...

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Upgrading of glycerol acetals through thermal catalyst-free transesterification of dialkyl carbonates under continuous-flow conditions

14.10.2014 | Maurizio Selva; Marco Noè; Sandro Guidi, Green Chemistry, 2014

At 250-300 °C and 30-50 bar, a continuous-flow (CF) transesterification of different dialkyl and alkylene carbonates (dimethyl-, diethyl-, dibenzyl-, and propylene carbonate, respectively) with two glycerol derived acetals (glycerol formal and solketal) was investigated without any catalyst. An ...

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Multicommuted flow system for cadmium determination in natural water by cold vapour atomic absorption spectrometry

14.10.2014 | Laiana Bastos Silva; Lindomar Andrade Portugal; Edwin Palacio; Laura Ferrer; Victor Cerdà; Sergio Luis Costa Ferreira, Journal of Analytical Atomic Spectrometry, 2014

The present paper proposes the use of a multisyringe flow injection analysis (MSFIA) system for determination of cadmium in natural waters by cold vapour atomic absorption spectrometry (CV-AAS). The chemical and physical conditions for vapour generation were investigated and optimized using ...

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