X-ray backlighting of developments of X-pinches and wire-array Z-pinches using an X-pinch

Zhao, Tongtiegang; Zou, Xiaobing; Wang, Xin; Zhao, Yun; Du, Yongchang; Zhang, R.

doi:10.1109/ppc.2009.5386186

Cited by 69 publications

(93 citation statements)

References 12 publications

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“…However, in native enzymes many difficulties in practical use exist in their sensitive properties such as instability against high temperature, organic solvents and serious pH conditions etc. Furthermore, the K m value for imprinted polymer is lower than the value reported in the literature for systems containing naturally immobilized peroxidases, [33][34][35][36][37][38][39][40] giving evidence for the higher sensitivity of the imprinted polymer. These results show that imprinted polymer could be used as a peroxidase mimicking catalyst, indicating that it could be an alternative for the peroxidase enzyme.…”

Section: Catalytic and Kinetic Effects Of The Imprinted Polymersmentioning

confidence: 85%

Synthesis, characterization and kinetics of catalytically active molecularly imprinted polymers for the selective recognition of 4-aminophenol

Santos¹,

Lima²,

Tarley³

et al. 2009

J. Braz. Chem. Soc.

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No presente trabalho um polímero com impressão molecular (MIP) seletivo para 4-aminofenol (4-APh) foi sintetizado através de técnica de polimerização em bulk. A polimerização foi realizada em tubo de vidro contendo 4-APh, Fe(III)protoporfrina(IX) (hemina, Fe(III)PPIX), ácido metacrílico (MAA), etileno glicol dimetacrilato (EGDMA) e 2,2'-azo-bis-iso-butironitrila (AIBN). O bloco de polímero foi moído e peneirado (106 µm) e o 4-APh foi removido das partículas do polímero pela extração com solução de metanol/ácido acético (4:1, v/v), deixando uma cavidade nas partículas do polímero. A hemina foi usada como um material sintético para imitar o centro ativo da peroxidase, criando um polímero com impressão molecular cataliticamente ativo. Os polímeros foram caracterizados por espectroscopia no infravermelho, análises termogravimétricas, microscopia eletrônica de varredura e análise do tamanho das partículas. O desempenho enzimático do polímero impresso foi avaliado baseado em parâmetros cinéticos incluindo V max e constante de Michaelis-Menten obtidas pelo gráfico de Lineweaver-Burk.In the present work a selective molecularly imprinted polymer (MIP) for 4-aminophenol (4-APh) was synthesized by the bulk polymerization technique. Polymerization was carried out in a glass tube containing 4-APh, Fe(III)protoporphyrin(IX) (hemin, Fe(III)PPIX), methacrylic acid (MAA), ethylene glycol dimethacrylate (EGDMA) and 2,2′-azo-bis-iso-butyronitrile (AIBN). The polymer block was ground and sieved (106 µm) and the 4-APh was removed from the polymer particles by leaching with a methanol/acetic acid (4:1, v/v) solution, which leaves a cavity in the polymer particles. Hemin was used as a synthetic material to mimic the active center of peroxidase creating a catalytically active molecularly imprinted polymer. The polymers were characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and particle size analysis. The enzymatic performance of the imprinted polymer was evaluated based on kinetic parameters including V max and the Michaelis-Menten constant obtained from Lineweaver-Burk plots. Keywords: molecularly imprinted polymers (MIP), hemin, 4-aminophenol, MichaelisMenten IntroductionMolecular imprinting is a useful technique for the preparation of ligand-selective cavities in synthetic polymer matrices. [1][2][3] Recently, the technique has attracted significant interest from a large number of areas within chemistry and the analytical sciences due to the relative ease with which these polymers may be prepared, the range of template structures that are amenable for use and the apparent mechanical and chemical stability of the types of polymers generally synthesized.Briefly, the technique may be described as follows. A template molecule is allowed to form reversible interactions (covalent or non-covalent) with suitable functionalized monomers in the presence of a cross-linking monomer. Polymerization affords a highly cross-linked macroporous polymer containing cavities with sites varying complementari...

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Section: Catalytic and Kinetic Effects Of The Imprinted Polymersmentioning

confidence: 85%

Synthesis, characterization and kinetics of catalytically active molecularly imprinted polymers for the selective recognition of 4-aminophenol

Santos¹,

Lima²,

Tarley³

et al. 2009

J. Braz. Chem. Soc.

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“…To evaluate the optimization of these experimental parameters, the Student's t-test was applied [31].…”

Section: Statistical Significant Analysismentioning

confidence: 99%

Double dispersant‐assisted ionic liquid dispersive liquid–liquid microextraction coupled with capillary electrophoresis for the determination of benzophenone‐type ultraviolet filters in sunscreen cosmetic product

Niu

et al. 2015

Electrophoresis

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In this work, double dispersant-assisted ionic liquid dispersive liquid-liquid microextraction coupled with micellar electrokinetic chromatography was developed to determine four UV filters (benzophenone, 4-hydroxybenzophenone, 2,4-dihydroxybenzophenone, and 2-hydroxy-4-methoxybenzophenone). 1-Hexyl-3-methylimidazolium hexafluorophosphate was used as the extraction solvent. The main novelty of the present work was that acetonitrile-Triton X-114 was used as double disperser solvent. Parameters affected the extraction efficiency were investigated and optimized. Under the optimum conditions, enrichment factors were in the range of 25.3-40.5. The limits of detection and quantitation, calculated at a S/N of three and ten, were 3.9-6.7 ng/mL and 13.0-22.3 ng/mL. The linearity of the method was in the range of 0.02-2 μg/mL for 2, 4-dihydroxybenzophenone and 4-hydroxybenzophenone, 0.01-2 μg/mL for benzophenone and 2-hydroxy-4-methoxybenzophenone, with correlation coefficient (R(2)) of 0.9984-0.9991. The proposed method was successfully applied to the determination of four benzophenone-type UV filters in six kinds of sunscreen cosmetic products, with yielded relative recoveries ranging from 80.2 to 117.7%.

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“…This is because at higher stretch rates and frequencies, viscoelastic effects stiffen the material, which limits the force generation, efficiency, and actuation speed, while simultaneously introducing the deleterious effects of creep, hysteresis, and stress relaxation. Correspondingly, there has recently been an increasing effort in the research community to study, both experimentally and theoretically, viscoelastic effects on the behavior of DEs [3,[8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…We do this in the context of focusing on the effects of viscoelasticity on the characteristics of two electromechanical instabilities that have been observed experimentally to cause failure in DEs: snap-through instability [9,21], and cracklike propagation emerging from a bursting drop in a DE [20].…”

Section: Introductionmentioning

confidence: 99%

Electrostatically Driven Creep in Viscoelastic Dielectric Elastomers

Wang

Nguyen

Park

2013

Journal of Applied Mechanics

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We utilize a nonlinear, dynamic finite element model coupled with a finite deformation viscoelastic constitutive law to study the inhomogeneous deformation and instabilities resulting from the application of a constant voltage to dielectric elastomers. The constant voltage hading is used to study electrostatically driven creep and the resulting electromechanical instabilities for two different cases that have all been experimentally observed, i.e., electromechanical snap-through instability and bursting drops in a dielectric elastomer. We find that in general, increasing the viscoelastic relaxation time leads to an increase in time needed to nucleate the electromechanical instability. However, we find for these two cases that the time needed to nucleate the instability scales with the relaxation time.

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X-ray backlighting of developments of X-pinches and wire-array Z-pinches using an X-pinch

Cited by 69 publications

References 12 publications

Synthesis, characterization and kinetics of catalytically active molecularly imprinted polymers for the selective recognition of 4-aminophenol

Synthesis, characterization and kinetics of catalytically active molecularly imprinted polymers for the selective recognition of 4-aminophenol

Double dispersant‐assisted ionic liquid dispersive liquid–liquid microextraction coupled with capillary electrophoresis for the determination of benzophenone‐type ultraviolet filters in sunscreen cosmetic product

Electrostatically Driven Creep in Viscoelastic Dielectric Elastomers

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