scholarly journals High-yield gram-scale organic synthesis using accelerated microdroplet/thin film reactions with solvent recycling

2020 ◽  
Vol 11 (9) ◽  
pp. 2356-2361 ◽  
Author(s):  
Honggang Nie ◽  
Zhenwei Wei ◽  
Lingqi Qiu ◽  
Xingshuo Chen ◽  
Dylan T. Holden ◽  
...  
Keyword(s):  
Thin Film ◽  
Chemical Synthesis ◽  
Organic Synthesis ◽  
Closed System ◽  
High Yield

A closed system has been designed to perform microdroplet/thin film reactions with solvent recycling capabilities for gram-scale chemical synthesis.

scholarly journals High-yield fabrication of perpendicularly magnetised synthetic antiferromagnetic nanodiscs

Nano Research ◽  
2021 ◽  
Author(s):  
Emma N. Welbourne ◽  
Tarun Vemulkar ◽  
Russell P. Cowburn
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Sacrificial Layer ◽  
Nanosphere Lithography ◽  
High Yield ◽  
Perpendicular Anisotropy ◽  
Ion Milling ◽  
Lift Off

AbstractSynthetic antiferromagnetic (SAF) particles with perpendicular anisotropy display a number of desirable characteristics for applications in biological and other fluid environments. We present an efficient and effective method for the patterning of ultrathin Ruderman-Kittel-Kasuya-Yoshida coupled, perpendicularly magnetised SAFs using a combination of nanosphere lithography and ion milling. A Ge sacrificial layer is utilised, which provides a clean and simple lift-off process, as well as maintaining the key magnetic properties that are beneficial to target applications. We demonstrate that the method is capable of producing a particularly high yield of well-defined, thin film based nanoparticles.

Effect of Metal Ions in Organic Synthesis; XVII. Mild, Easy, and High-Yield Conversion of Aldoximes into Nitriles under Copper(II) Acetate-Catalysis

Synthesis ◽  
1983 ◽  
Vol 1983 (09) ◽  
pp. 741-742 ◽  
Author(s):  
Orazio Attanasi ◽  
Pierangela Palma ◽  
Franco Serra-Zanetti
Keyword(s):  
Metal Ions ◽  
Organic Synthesis ◽  
High Yield

scholarly journals Erratum

1965 ◽  
Vol 11 (6) ◽  
pp. 632-632
Keyword(s):  
Thin Film ◽  
Thick Film ◽  
Closed System ◽  
Recent Article ◽  
Blood Ammonia

Abstract On page 518 of the recent article by Frederic E. Holmes (Closed-system apparatus for aeration-diffusion: Application to determination of blood ammonia. Clin. Chem.10, 512 [1965]), a line of type was inadvertently dropped. The final sentences of the next-to-the-last paragraph should read as follows: A possible explanation is that in a thick film more gas diffuses to-and-fro within the liquid, but in a thin film only a small amount can diffuse through the liquid in the very narrow cross area presented to it. Consequently a larger proportion is forced to diffuse across the interface into the space above the thin film.

Continuous flow biodiesel production from wet microalgae using a hybrid thin film microfluidic platform

2018 ◽  
Vol 54 (85) ◽  
pp. 12085-12088 ◽  
Author(s):  
Eko K. Sitepu ◽  
Darryl B. Jones ◽  
Youhong Tang ◽  
Sophie C. Leterme ◽  
Kirsten Heimann ◽  
...  
Keyword(s):  
Thin Film ◽  
Continuous Flow ◽  
Room Temperature ◽  
Biodiesel Production ◽  
High Yield ◽  
Hybrid Thin Film ◽  
Microfluidic Platform ◽  
Thin Film Device ◽  
Wet Microalgae

A novel continuous flow turbo-thin film device (T2FD) is effective in producing biodiesel in high yield from wet microalgae at room temperature.

scholarly journals Zeolites Catalyze the Nazarov Reaction and the tert-Butylation of Alcohols by Stabilization of Carboxonium Intermediates

Synthesis ◽  
2020 ◽  
Vol 52 (14) ◽  
pp. 2031-2037
Author(s):  
Antonio Leyva-Pérez ◽  
María Tejeda-Serrano ◽  
Sergio Sanz-Navarro ◽  
Finn Blake
Keyword(s):  
Organic Synthesis ◽  
Butyl Acetate ◽  
Strong Acid ◽  
Organic Reactions ◽  
High Yield ◽  
Acid Catalysts ◽  
Nazarov Cyclization ◽  
Triflic Acid ◽  
Nazarov Reaction ◽  
Tert Butyl

Zeolites are the most used catalysts worldwide in petrochemistry processes, with particular ability to stabilize carbocations. However, the use of zeolites in organic synthesis is still scarce. We show here that representative carboxonium-mediated organic reactions, such as the Nazarov cyclization and the tert-butylation of alcohols with tert-butyl acetate, typically performed with very strong acid catalysts in solution such as triflic acid, can be catalyzed by simple zeolites with high yield and selectivity. The aluminosilicate framework stabilizes the intermediate carboxonium species and overrides the need for superacid protons in solution.

DO BASINS AND BEAKERS NEGATIVELY BIAS DISPERSANT-EFFECTIVENESS TESTS?

2008 ◽  
Vol 2008 (1) ◽  
pp. 835-841 ◽  
Author(s):  
Tim Nedwed ◽  
Tom Coolbaugh
Keyword(s):  
Thin Film ◽  
Closed System ◽  
Water Surface ◽  
Open Ocean ◽  
Low Energy ◽  
Energy Conditions ◽  
Physical Constraints ◽  
Oil Slick ◽  
Closed Systems ◽  
Dispersant Effectiveness

ABSTRACT Beaker and basin dispersant-effectiveness tests are used to help determine if application of dispersants in a real oil-spill incident is worthwhile. This paper provides evidence indicating that these tests negatively bias expected dispersion at sea because beakers and basins do not allow the spreading of oil slicks that occurs after application of dispersant in the unbounded open ocean. One reason is that closed system walls and/or oil-slick containment methods impose physical boundaries that restrict oil spreading. In addition to these physical constraints, surfactant films developed after applying dispersant form on the water surface surrounding an oil slick and act as chemical herders to keep slicks thick. This occurs in the field during a real incident and in beaker and basin dispersant-effectiveness tests. Surfactant films on the water surface, however, are fragile and can't persist in the open ocean but can persist throughout the short duration of standard dispersant-effectiveness tests. This paper provides a background discussion of how surfactant films contaminate the water surface on the perimeter of oil slicks to restrict spreading in both open and closed systems and evidence that these fragile films don't persist in the open ocean. The discussion is followed by a description of lab tests that showed even minimal water-surface contamination from the surfactants in a widely available dispersant significantly restricted spreading to keep slicks thick. Thick oil slicks, by their nature, will obviously require more turbulence to disperse than a thin film of the same oil. Thus, it is believed that the restricted slick spreading inherent in dispersant-effectiveness tests completed in basins and beakers results in significantly lower performance than would be expected at sea not only for heavier oils but for all oils in tests simulating low-energy conditions.

Optimization of mechanical properties of thin free-standing metal films for RF-MEMS

2004 ◽  
Vol 820 ◽  
Author(s):  
Jaap M.J. den Toonder ◽  
Auke R. van Dijken
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Yield Strength ◽  
Rf Mems ◽  
High Yield ◽  
Film Material ◽  
X Ray Diffraction ◽  
Free Standing ◽  
Aluminum Films ◽  
Materials Used

AbstractThe mechanical properties of the thin film materials used in RF-MEMS are crucial for the reliability and proper functioning of the devices. In this paper we study a large number of aluminum alloys as possible RF-MEMS thin film materials. The yield strength and creep properties are measured using nano-indentation. The results show that the mechanical properties of thin aluminum films can be improved substantially by alloying elements. Of the alloys studied in this paper, AlCuMgMn in particular seems quite promising as a thin film material for RF MEMS, having both high yield strength and little creep. Using X-ray diffraction and electron microscopy, the observed effects are partly explained.

Continuous flow Fischer esterifications harnessing vibrational-coupled thin film fluidics

RSC Advances ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 1655-1660 ◽  
Author(s):  
Joshua Britton ◽  
Stuart B. Dalziel ◽  
Colin L. Raston
Keyword(s):  
Thin Film ◽  
Organic Synthesis ◽  
Continuous Flow ◽  
Environmentally Friendly ◽  
Flow Synthesis

Organic synthesis under shear: high yielding, acid catalysed, continuous flow synthesis of esters involves coupling of vibrations in thin film fluidics, as rapid environmentally friendly organic methodology.

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