scholarly journals Influence of Poly (Ethylene Glycol) 20,000 Concentration on Atomization and Deposition Characteristics of Nozzle

2021 ◽  
Vol 11 (22) ◽  
pp. 10513
Author(s):  
Yuxuan Jiao ◽  
Xinyu Xue ◽  
Suming Ding ◽  
Qingqing Zhou ◽  
Yong Tian ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Field Application ◽  
Spray Atomization ◽  
Horizontal Distance ◽  
Clear Water ◽  
Poly Ethylene Glycol ◽  
Theoretical Support ◽  
Different Types ◽  
Poly Ethylene ◽  
Medium Diameter

The addition of surfactants to pesticide spray applications is an important method to improve the spray atomization and the coverage of droplets on the target. The effects of different types of surfactants on spraying have been extensively studied, but there have been few studies on the commonly used surfactant polyethylene glycol so far. This article compares the effect of polyethylene glycol 20,000 on the atomization and deposition characteristics by measuring the droplet size and the deposition on the polyethylene collection line when spraying different concentrations of polyethylene glycol 20,000 solution. The results show that the volume medium diameter DV0.5 of spraying different concentrations of polyethylene glycol 20,000 solution is larger than that of clear water, and that as the concentration increases, the volume medium diameter DV0.5 gradually increases but ΦVol < 150 μm decreases. Spraying different concentrations of polyethylene glycol 20,000 solution at a horizontal distance of 2–7 m from the nozzle and at a distance of 0.1–0.2 m from the bottom of the floor, the depositions are all less than that of clear water, and as the concentration increases, the deposition becomes smaller. This article can provide theoretical support for the use and concentration ratio of polyethylene glycol 20,000 in field application.

Reappearance of slow mode in mixtures of polyethylene glycol and poly(sodium methacrylate)

Soft Matter ◽  
2018 ◽  
Vol 14 (24) ◽  
pp. 5039-5047
Author(s):  
Ksenija Kogej ◽  
Jaka Štirn ◽  
Jurij Reščič
Keyword(s):  
Polyethylene Glycol ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Ethylene Glycol ◽  
Slow Mode ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Scattering Signal ◽  
Sodium Methacrylate

After addition of poly(ethylene glycol) to a solution of poly(sodium methacrylate), the slow-mode dynamic light scattering signal reappears.

Alternative polymer precipitants for protein crystallization

2010 ◽  
Vol 43 (4) ◽  
pp. 737-742 ◽  
Author(s):  
Tereza Skálová ◽  
Jarmila Dušková ◽  
Jindřich Hašek ◽  
Petr Kolenko ◽  
Andrea Štěpánková ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Protein Crystallization ◽  
Glycol Adipate ◽  
Poly Ethylene Glycol ◽  
Ph Values ◽  
Ethylene Glycol Adipate ◽  
Acid Sodium Salt ◽  
Poly Ethylene ◽  
Glycol Methyl Ether

A set of 16 inexpensive and commercially available polymer precipitants were tested for protein crystallization. Eight of them were found suitable: polyethylene glycol dimethyl ether of molecular weight (MW) 500, 1000 and 2000; di[poly(ethylene glycol)] adipate, MW 900; poly(ethylene glycol-ran-propylene glycol), MW 2500 and 12000; poly(acrylic acid) sodium salt, MW 2100; and polyethylene glycol methyl ether methacrylate, MW 1100. Two new crystallization screens, PolyA and PolyB, were formulated using these eight polymers, each containing 96 solutions – four polymers in combination with 24 common salts and buffers, covering pH values from 4.5 to 9.0. The screens were tested on 29 proteins, 21 of which were crystallized. The tests confirmed the applicability of the eight polymers as precipitants for protein crystallization.

scholarly journals MoS2 QDs/8-Armed Poly(Ethylene Glycol) Fluorescence Sensor for Three Nitrotoluenes (TNT) Detection

Biosensors ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 475
Author(s):  
Xiaoyuan Zhang ◽  
Zhiqiang Su
Keyword(s):  
Quantum Dots ◽  
Polyethylene Glycol ◽  
Detection Limit ◽  
Ethylene Glycol ◽  
Hydrazine Hydrate ◽  
Poly Ethylene Glycol ◽  
Fluorescent Properties ◽  
Detection Range ◽  
Poly Ethylene ◽  
Tnt Detection

In this work, ammonia cross-linked 8-armed polyethylene glycol hydrogel material was successfully synthesized and used as a template for synthesizing nanoparticles with fluorescent properties. The 8-armed polyethylene glycol hydrogel template was used to prepare molybdenum disulfide quantum dots (MoS2 QDs). The ammonium tetrathiomolybdate functioned as a molybdenum source and hydrazine hydrate functioned as a reducing agent. The fluorescence properties of the as-prepared MoS2 QDs were investigated. The bursting of fluorescence caused by adding different concentrations of explosive TNT was studied. The study indicated that the synthesized MoS2 QDs can be used for trace TNT detection with a detection limit of 6 nmol/L and a detection range of 16–700 nmol/L. Furthermore, it indicated that the fluorescence-bursting mechanism is static bursting.

Estimation of the Poly(ethylene glycol) Chain Length of L-Polylactide-Polyethylene Glycol in Aqueous Dispersions Using Viscoelastic Measurements

Langmuir ◽  
1995 ◽  
Vol 11 (5) ◽  
pp. 1482-1485 ◽  
Author(s):  
S. A. Hagan ◽  
S. S. Davis ◽  
L. Illum ◽  
M. C. Davies ◽  
M. C. Garnett ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Chain Length ◽  
Poly Ethylene Glycol ◽  
Aqueous Dispersions ◽  
Poly Ethylene

Synthesis and Application of New Photocrosslinkers for Poly(ethylene glycol)

2012 ◽  
Vol 65 (2) ◽  
pp. 193 ◽  
Author(s):  
Hakim Mehenni ◽  
Vincent Pourcelle ◽  
Jean-François Gohy ◽  
Jacqueline Marchand-Brynaert
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Functional Polymers ◽  
Size Exclusion ◽  
Poly Ethylene Glycol ◽  
Polymer Backbone ◽  
Exclusion Chromatography ◽  
Exogenous Agents ◽  
Commercial Sources ◽  
Poly Ethylene

Photocrosslinking of polyethylene glycol (PEG) using exogenous agents is a convenient way to produce branched PEG from commercial sources thus avoiding the tricky synthesis of new reactive and functional polymers. In this study, we synthesized two series of new photocrosslinkers, i.e. bis-fluorophenyl azide and bis-trifluoromethyl diazirine, which under soft UV-irradiation produce reactive species (i.e. nitrene and carbene respectively) that insert into the C–H bond of the polymer backbone, building new bridges between macromolecular chains. These photocrosslinkers are different in terms of behaviour under irradiation and affinity for the target substrate (i.e. PEG). Thus, practical conditions for photocrosslinking of a 10-kDa PEG were studied and followed by NMR and size-exclusion chromatography. In particular, we investigated irradiation in bulk or in solvent, at different irradiation times, with several concentrations of PEG and photolinkers. Finally, we were able to design a procedure to obtain soluble crosslinked PEGs of 300 kDa.

scholarly journals Spontaneous Adhesion of DOPA and Tryptophan Functionalized PEG to Polystyrene Nanobeads: An EPR Study

2018 ◽  
Vol 915 ◽  
pp. 243-247 ◽  
Author(s):  
Yaman Göksel ◽  
İklima Kırpat ◽  
Yasar Akdogan
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Amino Acid ◽  
Poly Ethylene Glycol ◽  
Paramagnetic Resonance ◽  
Adhesion Mechanism ◽  
Free Condition ◽  
Different Types ◽  
Long Time ◽  
Poly Ethylene ◽  
Electron Paramagnetic

Wet adhesion is achieved by mussels so naturally. Their adhesion mechanism has inspired scientists to obtain wet adhesives for a long time. The amino acid 3,4-dihydroxyphenylalanine (DOPA) produced by mussels adheres to different types of surfaces and also contributes to cohesive interactions. Here, we showed the spontaneous adhesion of DOPA functionalized four armed poly (ethylene glycol) (PEG) polymer to spin labeled polystyrene (SL-PS) nanosurfaces by electron paramagnetic resonance (EPR) spectroscopy. In addition to DOPA, adhesion property of another amino acid of tryptophan (Trp) was studied. Trp attached four armed PEG polymers did not adhere to the surface of SL-PS in the force free condition. However, two armed DOPA and two armed Trp functionalized PEG adhere to the PS.

scholarly journals Preparation and physicochemical characterization of camptothecin conjugated poly amino ester–methyl ether poly ethylene glycol copolymer

RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12951-12959 ◽  
Author(s):  
Ali Fattahi ◽  
Nadia Karimi ◽  
Fatemeh Rahmati ◽  
Yalda Shokoohinia ◽  
Komail Sadrjavadi
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Methyl Ether ◽  
Michael Reaction ◽  
Physicochemical Characterization ◽  
Amino Ester ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

In the present study, camptothecin grafted poly amino ester-methyl ether polyethylene glycol (CPT-PEA-MPEG) as a novel copolymer was synthesized by Michael reaction at different ratios of MPEG and CPT (60 : 40 and 80 : 20).

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