AC Impedance Measurements of the Resistance and Capacitance of Lubricants

Wang, Simon S.; Maheswari, Shyam P.; Tung, Simon C.

doi:10.1080/05698198708981777

Cited by 39 publications

(47 citation statements)

References 8 publications

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“…Further, (iii) even though the amorphous structures are preferentially hydrolysed and therefore the crystallinity increases, it never approaches 100% RC. To this end, it is of interest to note that Wang et al 55 showed that (with pea starches) the crystallinity increased only initially and then remained constant, which they explained was due to equal hydrolysis of crystalline and amorphous areas after the initial event. This apparently corresponds to the shift to the later, slow stage of hydrolysis (Figure 1), when the amorphous background, which is degraded faster, 19 has been removed.…”

Section: On the Inferences Following Lintnerization On Potato Starch mentioning

confidence: 99%

Influence of amylopectin structure and degree of phosphorylation on the molecular composition of potato starch lintners

et al. 2013

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Morphology, molecular structure, and thermal properties of potato starch granules with low to high phosphate content were studied as an effect of mild acid hydrolysis (lintnerization) to 80% solubilization at two temperatures (25 and 45°C). Light microscopy showed that the lintners contained apparently intact granules, which disintegrated into fragments upon dehydration. Transmission electron microscopy of rehydrated lintners revealed lacy networks of smaller subunits. The molecular composition of the lintners suggested that they largely consisted of remnants of crystalline lamellae. When lintnerization was performed at 45°C, the lintners contained more of branched dextrins compared to 25°C in both low and intermediate phosphate-containing samples. High-phosphate-containing starch was, however, unaffected by temperature and this was probably due to an altered amylopectin structure rather than the phosphate content. After lintnerization, the melting endotherms were broad with decreased onset and increased peak melting temperatures. The relative crystallinity was lower in lintners prepared at 45°C. A hypothesis that combines the kinetics of lintnerization with the molecular and thermal characteristics of the lintners is presented.

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Section: On the Inferences Following Lintnerization On Potato Starch mentioning

confidence: 99%

Influence of amylopectin structure and degree of phosphorylation on the molecular composition of potato starch lintners

et al. 2013

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“…Higher trapping and separating efficiencies can be obtained by reducing the inefficient sections of the microchannel that are close to the sidewalls and do not take advantage of strong DEP forces. This can be achieved in several ways such as applying sheath flow to focus the particles along the centerline [40], patterning circular barriers close to sidewalls to reroute the particles off the sidewalls [41], or the integration of sidewall-patterned [42] or contactless microelectrodes [43].…”

Section: Separation Of 1 and 5 Lm Particles Using The Pt/n-cnt-pattermentioning

confidence: 99%

Dielectrophoretically patterned carbon nanotubes to sort microparticles

et al. 2010

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This article compares the operation of a dielectrophoretic (DEP) platform before and after pattering carbon nanotubes (CNTs) between its microelectrodes. The diverse performance of the DEP system is assessed by separating 1 and 5 μm polystyrene particles. In the absence of CNTs, both particles can only be trapped by operating the system at low medium conductivities, (<10(-3) S/m) and frequencies (<75 kHz). Alternatively, applying CNTs to the system, some CNTs coat the surface of particles and increase their overall conductivity and permittivity, whereas the rest of them are patterned between the microelectrodes and induce strong DEP forces at their free ends, which can effectively trap the coated particles. The first development extends the range of medium conductivities and frequencies at which the trapping of both particles is achievable, whereas the second development facilitates the selective deposition of particles along the surface of curved microelectrodes. Setting the medium conductivity to 2×10(-3) S/m and the frequency to 20 MHz, most of 5 μm particles are trapped at the entry region of the first microelectrode pair, whereas most of 1 μm particles are trapped at the tips, and this distinction facilitates their separation. The trapping of 1 μm particles can be improved by decreasing the frequency to 1.5 MHz. This study demonstrates how the integration of CNTs into microfluidic systems enables them to operate beyond their capabilities.

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“…However, the electronic properties of terminal acetylenes and haloalkyne substituents can affect the selectivity of the reaction, with the formation of homocoupling by-products that complicate the purification of the unsymmetrical 1,3-butadyines, leading to a decrease in yields. [1,16] Variations of the Cadiot-Chodkiewicz reaction were described by Wang et al, [17] employing CuI (10 mol-%)/P(o-Tol) 3 /K 2 CO 3 and EtOH as a solvent. This protocol gave good results with high selectivity.…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of Unsymmetrical 1,3‐Butadiyne Derivatives and their Application in the Synthesis of Unsymmetrical 2,5‐Diarylthiophenes

et al. 2018

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A one‐pot protocol was developed for the synthesis of unsymmetrical 1,3‐butadiynes. The procedure is based on two sequential reactions: deprotection of R–C≡C–C≡C–C(Me)2OH derivatives in a retro‐Favorskii reaction to furnish a terminal 1,3‐butadiyne compound, which reacted with aryl iodides in a Sonogashira‐type cross‐coupling reaction catalyzed by Pd(PPh3)4 and CuI, using TBAOH as activator and toluene as solvent under reflux for 10 min. We also studied in situ thiocyclization of 1,3‐butadiynes, leading to unsymmetrical 2,5‐diarylthiophenes. The principal features of this method are operational simplicity, good substrate scope, very fast reaction, and high yields.

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AC Impedance Measurements of the Resistance and Capacitance of Lubricants

Cited by 39 publications

References 8 publications

Influence of amylopectin structure and degree of phosphorylation on the molecular composition of potato starch lintners

Influence of amylopectin structure and degree of phosphorylation on the molecular composition of potato starch lintners

Dielectrophoretically patterned carbon nanotubes to sort microparticles

One‐Pot Synthesis of Unsymmetrical 1,3‐Butadiyne Derivatives and their Application in the Synthesis of Unsymmetrical 2,5‐Diarylthiophenes

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