Zirconia‐dispersed polyethylene glycol composites with a low temperature‐degradation rate

2020 ◽  
pp. 50384
Author(s):  
Allif Rosyidy Hilmi ◽  
Nibras Fuadi Muwwaqor ◽  
Nur Aini Fauziyah ◽  
Suminar Pratapa
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Degradation Rate

scholarly journals Formation of Polyethylene Glycol Particles Using a Low-Temperature Supercritical Assisted Atomization Process

Molecules ◽  
2019 ◽  
Vol 24 (12) ◽  
pp. 2235
Author(s):  
Hsien-Tsung Wu ◽  
Hong-Ming Tsai ◽  
Tsung-Hsuan Li
Keyword(s):  
Carbon Dioxide ◽  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Low Temperature ◽  
Flow Rate ◽  
Fine Particles ◽  
Volumetric Flow Rate ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Rate Ratios

Polyethylene glycol (PEG) particles were prepared using low-temperature supercritical assisted atomization (LTSAA) with carbon dioxide as the spraying medium or the co-solute and acetone as the solvent. The effects of several key factors on the particle size were investigated. These factors included the concentration of the PEG solution, precipitator temperature, saturator temperature, ratio of the volumetric flow rate of carbon dioxide to the PEG solution, and the molecular weight of PEG. Spherical and non-aggregated PEG particles, with a mean size of 1.7–3.2 µm, were obtained in this study. The optimal conditions to produce fine particles were found to be a low concentration of the PEG solution, a low precipitator temperature, and low molecular weight of the PEG. The phase behavior of the solution mixture in the saturator presented a qualitative relationship. At the optimized volumetric flow rate ratios, the composition of CO2 in the feed streams was near the bubble points of the saturator temperatures. X-ray and differential scanning calorimetry analyses indicated that LTSAA-treated PEG had a reduced degree of crystallinity, which could be modulated via the precipitator temperature. PEG microparticles prepared by a LTSAA process would be promising carriers for drug-controlled formulations of PEG-drug composite particles.

Structural role of polyethylene glycol in the formation of anatase nanocrystalline titania at low temperature

2009 ◽  
Vol 40 (12) ◽  
pp. 1885-1894 ◽  
Author(s):  
Srinivasan Priya ◽  
Subramanian Balaji ◽  
Yahia Djaoued ◽  
Jacques Robichaud
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Structural Role ◽  
Nanocrystalline Titania

Effect of different priming treatments and priming durations on melon germination behavior under suboptimal conditions

2018 ◽  
Vol 3 (1) ◽  
pp. 386-392 ◽  
Author(s):  
J. L. Castañares ◽  
C. A. Bouzo
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Temperature Stress ◽  
Osmotic Potential ◽  
Germination Percentage ◽  
Control Treatment ◽  
Saline Stress ◽  
Mean Germination Time ◽  
Osmotic Agents ◽  
Polyethylene Glycol 6000

AbstractThe objective of this work was to compare the effect of different priming osmotic agents and durations on melon germination in: 1) low temperature stress; 2) saline stress; and 3) low temperature and saline stress. The osmotic agents were polyethylene glycol 6000, KNO3+K3PO4, CaCl2and NaCl, with -1.5 MPa osmotic potential. Priming durations were 3 and 6 days (d). Germination percentage (GP) and mean germination time (MGT) were measured. At 12°C the best GP was 14% with CaCl2/3-d, without germination in control. At 25°C the best GP was 100% with CaCl2/3-d. MGT was reduced one day. At -0.7 MPa GP was 100% with CaCl2/3-d and NaCl 3d. At -1.0 MPa the best GP were 46 and 50% for 3d with NaCl and CaCl2respectively without germination in control treatment. At 12°C and -1.0 MPa the best GP were CaCl2/3-d and CaCl2/3-d (14 and 10% respectively). It is concluded that at 12°C, the increase in GP would not justify the use of priming. At 25°C priming increased GP and reduced MGT. At -0.7 MPa priming increased germination, while at -1.0 MPa the increase is not agronomical considerable. At 12°C and -1.0 MPa the increase of germination is not agronomical important.

INCREASED SEEDLING ESTABLISHMENT OF IMPATIENS WALLERANA IN RESPONSE TO LOW TEMPERATURE OR POLYETHYLENE GLYCOL SEED TREATMENTS

1980 ◽  
Vol 60 (2) ◽  
pp. 561-569 ◽  
Author(s):  
JOHN SIMMONDS
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Seedling Establishment ◽  
Large Scale ◽  
Soil Cover ◽  
Commercial Production ◽  
Seedling Development ◽  
Peg 6000 ◽  
Pre Treatment ◽  
Impatiens Wallerana

Seeds of Impatiens wallerana ’Elfin Scarlet’ were pre-treated with low temperature (8 °C) imbibition and hypertonic osmotic solutions of polyethylene glycol (PEG) 6000 in an attempt to improve seedling establishment under greenhouse conditions. Seeds held at 8 °C for 7 or 14 days germinated faster at 25 °C than non-treated seeds; seedling development was more rapid and there was a significant improvement in seedling establishment. Application of a soil cover improved seedling establishment in both control and pre-treated seeds. PEG pre-treated seeds germinated within 24 h of being released from osmotic control. The optimum pre-treatment was determined to be PEG −7.5 bars for 10 days, which resulted in 80% germination within 24 h, more advanced seedling development after 5 days, 92% seedling establishment and earlier flowering. Although PEG pre-treatments were superior to the low temperature pre-treatments, they are not readily applicable on a large scale. However, low temperature seed pre-treatment can be easily utilized to improve seedling establishment in commercial production.

Low-temperature scanning electron microscopic observations on endosperm in imbibed and germinated lettuce seeds

1998 ◽  
Vol 76 (3) ◽  
pp. 509-516 ◽  
Author(s):  
J Nijsse ◽  
E Erbe ◽  
NBM Brantjes ◽  
JHN Schel ◽  
W P Wergin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polyethylene Glycol ◽  
Low Temperature ◽  
Lactuca Sativa ◽  
Electron Microscopic ◽  
Lettuce Seeds ◽  
Temperature Scanning ◽  
Germinating Seeds ◽  
Scanning Electron

Lettuce (Lactuca sativa L.) seeds were observed using low-temperature scanning electron microscopy (LTSEM). The structure of imbibing and germinating seeds was characterized and compared with that of seeds in which these processes were inhibited by high temperature, far-red irradiation, or polyethylene glycol. Germination is not associated with general breakdown or digestion of the entire endosperm at the micropylar region. Embryos of seeds imbibed in polyethylene glycol, which inhibited germination, appeared to lack turgor and were not able to emerge from the endosperm. Thermal or far-red inhibitory treatments were associated with the appearance of complex membraneous structures in cells of the endosperm and the embryo.Key words: endosperm, germination, Lactuca sativa, lettuce, low temperature scanning electron microscopy, seed.

scholarly journals Gold Nanoparticles Endowed with Low-Temperature Colloidal Stability by Cyclic Polyethylene Glycol in Ethanol

Soft Matter ◽  
2021 ◽  
Author(s):  
M. Ali Aboudzadeh ◽  
Joscha Kruse ◽  
Maria Sanromán-Iglesias ◽  
Daniele Cangialosi ◽  
Ángel Alegría ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Low Temperature ◽  
Thermal Behavior ◽  
Metal Nanoparticles ◽  
Polymer Brushes ◽  
Colloidal Stability ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature

The colloidal stability of metal nanoparticles is tremendously dependent on the thermal behavior of polymer brushes. Neat polyethylene glycol (PEG) presents an unconventional upper critical solution temperature in ethanol, where...

scholarly journals Improved performance of muskmelon (Cucumis melo) seeds with osmoconditioning

2013 ◽  
Vol 52 (1-2) ◽  
pp. 121-137 ◽  
Author(s):  
G. Singh ◽  
S. S. Gill ◽  
Kamaljit K. Sandhu
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Dehydrogenase Activity ◽  
Cucumis Melo ◽  
Electrical Conductance ◽  
Dry Weight ◽  
Peg 6000 ◽  
Germination Speed ◽  
Improved Performance ◽  
Increased Activity

Seeds of muskmelon (<em>Cucuniis melo</em>) cultivars viz Pb. Hybrid and Pb. Sunehri were osmoconditioned with Polyethylene glycol (PEG) and KNO<sub>3</sub> solutions to enhance their performance at low temperature. Osmoconditioning both with PEG 6000 and KNO<sub>3</sub> increased per cent germination, speed of germination, vigour in terms of dry weight and length of the seedlings and root/shoot ratios. KNO<sub>3</sub> priming recorded more pronounced effects in all the above mentioned parameters. Other vigour parameters such as electrical conductance of seed leachates was decreased with osmoconditioning whi]e dehydrogenase activity was enhanced. Osmoconditioning resulted in increased activity of amylases.

scholarly journals Low-temperature growth of polyethylene glycol-doped BiZn2VO6 nanocompounds with enhanced photoelectrochemical properties

2017 ◽  
Vol 5 (3) ◽  
pp. 1112-1119 ◽  
Author(s):  
S. Elhag ◽  
D. Tordera ◽  
T. Deydier ◽  
J. Lu ◽  
X. Liu ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Low Temperature ◽  
Low Cost ◽  
Photoelectrochemical Properties ◽  
Temperature Growth ◽  
Low Temperature Growth

We demonstrate scalable, low-cost and low-temperature (<100 °C) chemical growth of bismuth–zinc vanadate (BiZn2VO6) nanocompounds by BiVO4 growth on ZnO nanobelts (NBs).

Effect of Heat Aging on Properties and Structure of SBS Modified Bitumen Waterproof Membrane

2021 ◽  
Vol 1035 ◽  
pp. 951-957
Author(s):  
Yan Heng He ◽  
Zhi Long Cao ◽  
Yang Yang Ge ◽  
Zhao Yang Liu ◽  
Jiang Ting Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Aging Time ◽  
Carbonyl Compounds ◽  
Softening Point ◽  
Degradation Rate ◽  
Modified Bitumen ◽  
Maximum Tension ◽  
Initial Stage ◽  
Before And After ◽  
Low Temperature Flexibility

The properties of SBS modified bitumen waterproof membrane (SMBM) will deteriorate under the action of heat. In this paper, SBS modified bitumen (SMB) and SMBM were aged at 80 °C for different times (0,10,20,30,40 days). The low temperature flexibility, softening point, viscosity and mass changes ratio of SMB and mechanical properties of SMBM before and after aging were tested, the microstructure and chemical structure of SMB were investigated by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR). The results show that the low temperature flexibility, softening point and viscosity of SMB decrease significantly at the initial stage of heat aging (10 days), especially the influence of heat aging on the low temperature flexibility and viscosity of SMB is more obvious, and their properties degradation rate slowdown in the later stage of aging. The mass changes ratio of SMB first decreases and then increases with aging time. FM shows that the network crosslinking structure of SMB is destroyed gradually with the extension of aging time. The network crosslinking structure disappears after 40 days of heat aging. FTIR shows that carbonyl and sulfoxide compounds are increasing after aging, more carbonyl compounds than sulfoxide compounds are formed after aging for 10 days, and the degradation rate of SBS decreases. The maximum tension of SMBM first increases and then decreases, the elongation at maximum tension decreases with aging time.

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