Polyethylene glycol/modified carbon foam composites for efficient light-thermal conversion and storage

Polymer ◽  
2021 ◽  
pp. 123894
Author(s):  
Fankai Lin ◽  
Xiaoguang Zhang ◽  
Xianjie Liu ◽  
Yunfei Xu ◽  
Zhenhua Sun ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Carbon Foam ◽  
Thermal Conversion ◽  
And Storage

Shape-stabilized phase-change materials supported by eggplant-derived porous carbon for efficient solar-to-thermal energy conversion and storage

2020 ◽  
Vol 4 (4) ◽  
pp. 1764-1772 ◽  
Author(s):  
Yaqiong Li ◽  
Xiubing Huang ◽  
Yang Li ◽  
Zuoshuai Xi ◽  
Guangtong Hai ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Phase Change ◽  
Porous Carbon ◽  
Phase Change Materials ◽  
Carbon Materials ◽  
Thermal Conversion ◽  
Thermal Energy Conversion ◽  
Composite Phase Change Materials ◽  
Energy Conversion And Storage ◽  
And Storage

3D spongy-like porous carbon materials derived from eggplants were used as scaffolds for encapsulating polyethylene glycol (PEG) to fabricate shape-stabilized composite phase-change materials with excellent solar-to-thermal conversion efficiency.

scholarly journals A Unique Strategy for Polyethylene Glycol/Hybrid Carbon Foam Phase Change Materials: Morphologies, Thermal Properties, and Energy Storage Behavior

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2011 ◽  
Author(s):  
Xiaolong Su ◽  
Shikui Jia ◽  
Guowei Lv ◽  
Demei Yu
Keyword(s):  
Carbon Nanotubes ◽  
Polyethylene Glycol ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Phase Change Materials ◽  
Carbon Foam ◽  
Chemical Structures ◽  
Walled Carbon Nanotubes ◽  
Hybrid Carbon

Polyethylene glycol (PEG)/hybrid carbon foam (CF) phase change materials (PCMs) were prepared by integrating PEG into CF via dynamic-vacuum impregnation. The hybrid CF was first synthesized by mixtures of graphene oxide (GO) and carbon nanotubes (CNTs) with different volume ratios. The morphologies, chemical structures, thermal conductivities, shape-stabilization levels, and photo-thermal energy conversion levels of these composite PCMs were characterized systematically. The prepared composite PCMs exhibited good shape-stabilization levels and showed their original shapes without any PEG leakage. It was found that the polyethylene glycol/carbon foam with multi-walled carbon nanotubes (PEG/MCF) composite PCMs had a better shape-stable performance below the temperature of 250 °C, and the thermal conductivity of the PEG/MCF composite PCMs reached as high as 1.535 W/(mK), which was obviously higher than that of polyethylene glycol/carbon foam with single-walled carbon nanotubes (PEG/SCF, 1.159 W/(mK)). The results of the photo-thermal simulation tests showed that the composite PCMs had the ability to absorb light energy and then convert it to thermal energy, and the maximum thermal energy storage efficiency of the PEG/MCF composite PCMs and the PEG/SCF composite PCMs was 92.1% and 90.6%, respectively. It was considered that a valuable technique to produce high-performance composite PCMs was developed.

Free and total insulin as determined after precipitation with polyethylene glycol: analytical characteristics and effects of sample handling and storage.

1987 ◽  
Vol 33 (1) ◽  
pp. 93-96 ◽  
Author(s):  
H Arnqvist ◽  
P O Olsson ◽  
H von Schenck
Keyword(s):  
Polyethylene Glycol ◽  
Room Temperature ◽  
Serum Samples ◽  
Sample Handling ◽  
Insulin In Plasma ◽  
Analytical Recovery ◽  
Free Insulin ◽  
Assay Precision ◽  
And Storage ◽  
Collection Time

Abstract We evaluated results of radioimmunoassays of free and total insulin after precipitation of endogenous antibodies with polyethylene glycol (PEG), and we investigated the influence of collection time, temperature, and storage in heparin- cr EDTA-treated plasma or serum on results for free insulin. Analytical recovery of free insulin was 99.3%, of total insulin 96.4%. For free insulin, assay precision (CV) was 4.0-13.0% (intra-assay) and 7.8-10.7% (inter-assay); for total insulin, 3.6-9.5% and 6.6-11.7%, respectively. Free insulin decreased in plasma (p less than 0.05) and serum (p less than 0.01) at room temperature after 3 h and in promptly analyzed serum (p less than 0.01). Storage of samples at -20 degrees C increased the concentration of free insulin in plasma (p less than 0.025) and serum (p less than 0.005), whereas the free insulin content of supernates after PEG precipitation was stable, except for a slight decrease in serum samples (p less than 0.02). We conclude that, for radioimmunoassay of free and total insulin, plasma should be used, treated with PEG without delay; supernates then are analytically stable for as long as 26 weeks at -20 degrees C.

scholarly journals Cryopreservation of Limnoperna fortunei (golden mussel) sperm with polyethylene glycol

2018 ◽  
Author(s):  
Milica Markovic ◽  
Juliana Alves Americo ◽  
Inês Julia Ribas Wajsenzon ◽  
Yasmin Rodrigues da Cunha ◽  
Thaísa Vieira Santos de Souza ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Survival Rate ◽  
Ethylene Glycol ◽  
Limnoperna Fortunei ◽  
Polyethylene Glycol 4000 ◽  
Cryoprotective Agents ◽  
Viable Sperm ◽  
Golden Mussel ◽  
And Storage ◽  
Cryopreservation Protocol

Background. Insufficient quantities of freshly harvested Limnoperna fortunei gametes and embryos constrain reproduction research in the laboratory. Cryopreservation would allow the accumulation and storage of gametes when they are available. The lack of available cryopreservation protocol for Limnoperna fortunei in the literature led our research group to undertake a study to establish which cryoprotective agents can be might be most useful for cryopreservation of this species’ sperm. Methods. 2%, 5%, and 10% concentration of ethylene glycol, dimethyl sulfoxide, glycerol, and polyethylene glycol 4000 as well as 0.2 M glucose, sucrose, and trehalose (mixed into the 10% concentration of the aforementioned agents) were tested in a 1:1 ratio with sperm, in 0.25 ml straws, frozen in liquid nitrogen. Results. After 48 hours the best survival rate was in the samples with 10% polyethylene glycol 4000, 36.1%, which also resulted in viable sperm after 7 and 15 days.

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