The role of ions in the continuous-wave plasma polymerisation of acrylic acid

1999 ◽  
Vol 1 (13) ◽  
pp. 3117-3121 ◽  
Author(s):  
S Candan ◽  
A J. Beck ◽  
L O'Toole ◽  
R D. Short ◽  
A Goodyear ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Continuous Wave ◽  
Plasma Polymerisation

Ion flux and deposition rate measurements in the RF continuous wave plasma polymerisation of acrylic acid

1998 ◽  
pp. 1221-1222 ◽  
Author(s):  
A. J. Beck ◽  
R. M. France ◽  
A. M. Leeson ◽  
R. D. Short ◽  
R. M. France ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Deposition Rate ◽  
Continuous Wave ◽  
Ion Flux ◽  
Plasma Polymerisation

The Role of the Initiator System in the Synthesis of Acidic Multifunctional Nanoparticles Designed for Molecular Imprinting of Proteins

2020 ◽  
Vol 65 (1) ◽  
pp. 28-41
Author(s):  
Marwa Aly Ahmed ◽  
Júlia Erdőssy ◽  
Viola Horváth
Keyword(s):  
Acrylic Acid ◽  
Binding Affinity ◽  
Molecular Imprinting ◽  
Low Temperatures ◽  
Ammonium Persulfate ◽  
Sodium Bisulfite ◽  
Multifunctional Nanoparticles ◽  
High Affinity ◽  
Initiator System

Multifunctional nanoparticles have been shown earlier to bind certain proteins with high affinity and the binding affinity could be enhanced by molecular imprinting of the target protein. In this work different initiator systems were used and compared during the synthesis of poly (N-isopropylacrylamide-co-acrylic acid-co-N-tert-butylacrylamide) nanoparticles with respect to their future applicability in molecular imprinting of lysozyme. The decomposition of ammonium persulfate initiator was initiated either thermally at 60 °C or by using redox activators, namely tetramethylethylenediamine or sodium bisulfite at low temperatures. Morphology differences in the resulting nanoparticles have been revealed using scanning electron microscopy and dynamic light scattering. During polymerization the conversion of each monomer was followed in time. Striking differences were demonstrated in the incorporation rate of acrylic acid between the tetramethylethylenediamine catalyzed initiation and the other systems. This led to a completely different nanoparticle microstructure the consequence of which was the distinctly lower lysozyme binding affinity. On the contrary, the use of sodium bisulfite activation resulted in similar nanoparticle structural homogeneity and protein binding affinity as the thermal initiation.

scholarly journals Comparative investigation of lasing and amplification performance in cryogenic Yb:YLF systems

2021 ◽  
Vol 127 (3) ◽  
Author(s):  
Umit Demirbas ◽  
Martin Kellert ◽  
Jelto Thesinga ◽  
Yi Hua ◽  
Simon Reuter ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Estimation Method ◽  
Laser Cavity ◽  
Comparative Investigation ◽  
Limiting Factor ◽  
Experimental Conditions ◽  
Temperature Estimation ◽  
Transverse Temperature ◽  
First Time

AbstractWe present detailed experimental results with cryogenic Yb:YLF gain media in rod-geometry. We have comparatively investigated continuous-wave (cw) lasing and regenerative amplification performance under different experimental conditions. In the cw lasing experiments effect of crystal doping, cw laser cavity geometry and pump wavelength on lasing performance were explored. Regenerative amplification behavior was analyzed and the role of depolarization losses on performance was investigated. A recently developed temperature estimation method was also employed for the first time in estimating average crystal temperature under lasing conditions. It is shown that the thermal lens induced by transverse temperature gradients is the main limiting factor and strategies for future improvements are discussed. To the best of our knowledge, the achieved results in this study (375 W in cw, and 90 W in regenerative amplification) are the highest average powers ever obtained from this system via employing the broadband E//a axis.

The role of potential fluctuations in continuous-wave donor–acceptor pair luminescence of heavily doped materials

1999 ◽  
Vol 75 (9) ◽  
pp. 1243-1245 ◽  
Author(s):  
I. Kuskovsky ◽  
D. Li ◽  
G. F. Neumark ◽  
V. N. Bondarev ◽  
P. V. Pikhitsa
Keyword(s):  
Continuous Wave ◽  
Acceptor Pair ◽  
Potential Fluctuations ◽  
Donor Acceptor ◽  
Heavily Doped ◽  
Donor Acceptor Pair ◽  
Doped Materials

scholarly journals 1633 Final non-invasive echo-guided assessment of left atrial pressure after percutaneous edge-to-edge procedure for mitral regurgitation

2020 ◽  
Vol 21 (Supplement_1) ◽  
Author(s):  
M Gavazzoni ◽  
M Z Zuber ◽  
A P Pozzoli ◽  
M T Taramasso ◽  
F M Maisano
Keyword(s):  
Correlation Coefficient ◽  
Left Atrial ◽  
Continuous Wave ◽  
Venous Pressure ◽  
Right Atrial ◽  
Rater Reliability ◽  
Intra Class Correlation ◽  
Therapeutic Decisions ◽  
Intra Class Correlation Coefficient

Abstract Background/Introduction. Recently the central role of hemodynamic invasive monitoring during MitraClip (Abbott Vascular, Santa Clara, CA, USA) procedure has been raised. After removal of Steerable Guide Catheter (SGC) at the end of procedure, iatrogenic interatrial septum defect determines acute sub-clinical hemodynamic changes depending on right atrial (RA) and left atrial (LA) pressures. The possibility to assess LAP non-invasively by Doppler -echocardiography at the end of the procedure allows to quantify real hemodynamic impact of reduction of MR and leaves the door open to further therapeutic decisions (such as closure of iatrogenic IASd). Purpose This prospective study aimed to assess the role of evaluation of post-procedural mean trans-atrial gradient with continuous-wave (CW) Doppler (DPmean-IAS) in estimating final m-LAP after removal of SGC. Methods We prospectively performed the computation of trans-atrial CW- Doppler tracing for estimation of mean-transatrial gradient (meanGp-LA-RA) in patients treated with MitraClip; we added the estimation of central venous pressure (CVP) according to: i) dilatation of superior vena cava (IVC, mm); ii) presence or not of systolic excursion of IVC (end-inspiratory excursion was not evaluable in patients under sedation); iii) hepatic vein dilatation. The sum of CVP estimated and meanGp-LA-RA (mmHg) represents the m-LAP-Echo-measured at the end of procedure. This value has been compared with m-LAP measured invasively before removal of SGC. We tested the inter-rater reliability with the Intra-class Correlation Coefficient for comparing this method with the gold standard (invasive assessment of LAP). Results we included 19 patients; aetiology of MR was degenerative in 89% of cases. Basal m-LAP was 15 ± 13,3 mmHg and decreased by 32% by the end of procedure (mean-LAP at the end: 10,1 ± 3,3 mmHg, p < 0.001). At the end of the procedure mean Gp-LA-RA was 2.5 ± 1.2 mmHg and CVP 7.5 ± 3.5; the m-LAP-Echo-measured was 9.6 ± 2.4. The delay in time of computation of m-LAP by echocardiography with respect to last invasive assessment available was computed and settled around 5 minutes (IQR 3-9 min). The inter-rater reliability with the Intra-class Correlation Coefficient was high: 0.8, (CI95% 0.647-0.948, p < 0.01); with Bland-Altman test we could assess that bias of measures was acceptable for this clinical context with upper concordance limit of 2,7 mmHg and lower of 4,7 mmHg, with a bias of 0,9 mmHg, not relevant for this clinical purpose. Conclusions The present study represents the first validation of a Doppler-based method for non invasively assessing post-procedural LAP in percutaneous mitral valve interventions requiring transeptal approach. Follow up is needed for correlate this value with clinical outcomes.

A Mass Spectrometric and Ion Energy Study of the Continuous Wave Plasma Polymerization of Acrylic Acid

Langmuir ◽  
2000 ◽  
Vol 16 (13) ◽  
pp. 5654-5660 ◽  
Author(s):  
David B. Haddow ◽  
Richard M. France ◽  
Robert D. Short ◽  
James W. Bradley ◽  
David Barton
Keyword(s):  
Acrylic Acid ◽  
Plasma Polymerization ◽  
Continuous Wave ◽  
Mass Spectrometric ◽  
Ion Energy

Surface functionalisation of polypropylene hernia-repair meshes by RF-activated plasma polymerisation of acrylic acid and silver nanoparticles

2015 ◽  
Vol 328 ◽  
pp. 287-295 ◽  
Author(s):  
Roberto Nisticò ◽  
Andrea Rosellini ◽  
Paola Rivolo ◽  
Maria Giulia Faga ◽  
Roberta Lamberti ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Acrylic Acid ◽  
Hernia Repair ◽  
Surface Functionalisation ◽  
Plasma Polymerisation

Dehydration of lactic acid to acrylic acid over lanthanum phosphate catalysts: the role of Lewis acid sites

2016 ◽  
Vol 18 (34) ◽  
pp. 23746-23754 ◽  
Author(s):  
Zhen Guo ◽  
De Sheng Theng ◽  
Karen Yuanting Tang ◽  
Lili Zhang ◽  
Lin Huang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Lanthanum Phosphate ◽  
Lewis Acidic Sites ◽  
Acidic Sites ◽  
Nano Rods

Lewis acidic sites on the surface of lanthanum phosphate nano-rods play a crucial role on the catalytic dehydration of lactic acid to acrylic acid.

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