Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

Science ◽  
2018 ◽  
Vol 362 (6412) ◽  
pp. 315-319 ◽  
Author(s):  
Jyotirmoy Mandal ◽  
Yanke Fu ◽  
Adam C. Overvig ◽  
Mingxin Jia ◽  
Kerui Sun ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Outer Space ◽  
Polymer Coatings ◽  
Porous Polymer ◽  
Radiative Cooling ◽  
Hierarchically Porous ◽  
Poly Vinylidene Fluoride ◽  
Limited Applicability ◽  
Subambient Temperature ◽  
Substrate Independent

Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling but are either inefficient or have limited applicability. We present a simple, inexpensive, and scalable phase inversion–based method for fabricating hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene) [P(VdF-HFP)HP] coatings with excellent PDRC capability. High, substrate-independent hemispherical solar reflectances (0.96 ± 0.03) and long-wave infrared emittances (0.97 ± 0.02) allow for subambient temperature drops of ~6°C and cooling powers of ~96 watts per square meter (W m−2) under solar intensities of 890 and 750 W m−2, respectively. The performance equals or surpasses those of state-of-the-art PDRC designs, and the technique offers a paint-like simplicity.

NOVEL POLYMER ELECTROLYTE BASED ON POLY(VINYLIDENE FLUORIDE) AND POLY(4-VINYL PYRIDINE) HAVING A NANO-CHANNEL FOR ION TRANSPORTATION

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1313-1318
Author(s):  
SEUNG HYUN OH ◽  
SEONG LAK KANG ◽  
KWANG-UN JEONG ◽  
CHANGWOON NAH ◽  
BAIK-HWAN CHO
Keyword(s):  
Ionic Conductivity ◽  
Vinylidene Fluoride ◽  
Porous Polymer ◽  
Fiber Mats ◽  
Vinyl Pyridine ◽  
Poly Vinylidene Fluoride ◽  
Nano Channel ◽  
Wet Condition ◽  
Ion Transportation ◽  
Fast Ion

The micro-porous polymer electrolytes membranes(PEMs), notably electro-spun fiber mats, have been suggested to give an improved ionic conductivity. However, the mat-type PEMs have a poor mechanical and dimensional stability because of their inevitable porous nature. In this study, we suggest a new PEM system based on poly(vinylidene fluoride)(PVdF) mats, which can overwhelm such shortcomings of the porous mats by introducing another component, poly(4-vinyl pyridine)(P4VP), into the mats. The tensile strength of PVdF / P 4 VP membrane was considerably improved compared with that of pristine PVdF membrane under dry and wet conditions. The ionic conductivity was also improved by about 10 times than that of PVdF mat. A micro- to nano-size gap was formed at the interfaces between PVdF nanofiber and P 4 VP , and this may act as a channel for fast ion transportation under wet condition.

Porous polymer electrolyte based on poly(vinylidene fluoride)/comb-liked polystyrene via ionic band functionalization

2018 ◽  
Vol 564 ◽  
pp. 663-671 ◽  
Author(s):  
Mengke Guo ◽  
Binghua Zhou ◽  
Ji Hu ◽  
Jirong Wang ◽  
Dan He ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Vinylidene Fluoride ◽  
Porous Polymer ◽  
Poly Vinylidene Fluoride

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

Effect of Carbon Nanotubes on the Shape Memory Performance of Poly(vinylidene fluoride)/Acrylic Blends

2013 ◽  
Vol 30 (2) ◽  
pp. 134
Author(s):  
Hui FU ◽  
Jishan QIU ◽  
Ning CHONG ◽  
Yaqing WANG ◽  
Yuanyuan TIAN ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Vinylidene Fluoride ◽  
Memory Performance ◽  
Poly Vinylidene Fluoride

Discharge Poling and Poly(Vinylidene Fluoride) Films

1991 ◽  
Author(s):  
Y. Takase ◽  
J. I. Scheinbeim ◽  
B. A. Newman
Keyword(s):  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride
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