A broadband acoustic panel based on double-layer membrane-type metamaterials

2021 ◽  
Vol 118 (18) ◽  
pp. 184101
Author(s):  
Huy Nguyen ◽  
Qian Wu ◽  
Jiaji Chen ◽  
Yukai Yu ◽  
Hui Chen ◽  
...  
Keyword(s):  
Double Layer ◽  
Layer Membrane ◽  
Membrane Type

Preparation and characterization of SPES/PVA (double-layer) membrane for vanadium redox flow battery

2018 ◽  
Vol 31 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Jili Xie ◽  
Guanlin Li ◽  
Wang Tan
Keyword(s):  
Double Layer ◽  
Layer Structure ◽  
Coulombic Efficiency ◽  
Cell Performance ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Layer Membrane ◽  
Vanadium Redox ◽  
Vanadium Ions

The double-layer membrane consisting of sulfonated poly(ether sulfone) (SPES) sub-layer and polyvinyl alcohol (PVA) sub-layer (denoted as SPES/PVA membrane) was prepared and employed as the separator for vanadium redox flow battery (VRB) system to evaluate the vanadium ions permeability and cell performance. The SPES/PVA membrane is a double-layer structure and exhibits dramatically lower vanadium ions permeability and better cell performance compared to the pristine SPES membrane, PVA membrane, and Nafion117 membrane. The vanadium ion permeability of SPES/PVA membrane is one order of magnitude lower than that of Nafion117 membrane. In further work, the single cell with SPES/PVA membrane showed significantly lower capacity loss, higher coulombic efficiency (>92.5%), and higher energy efficiency (>83.9%) than Nafion117 membrane. In the self-discharge test, SPES/PVA membrane showed 1.8 times longer duration in the open circuit decay than Nafion117 membrane. With all the good properties and low cost, this new kind of double-layer membrane is suggested to have excellent commercial prospects as an ion exchange membrane for VRB systems.

scholarly journals A Sponge-Like Double-Layer Wound Dressing with Chitosan and Decellularized Bovine Amniotic Membrane for Promoting Diabetic Wound Healing

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 535
Author(s):  
Yang Yang ◽  
Yanyan Zhang ◽  
Yishu Yan ◽  
Qian Ji ◽  
Yutong Dai ◽  
...  
Keyword(s):  
Wound Healing ◽  
Double Layer ◽  
Amniotic Membrane ◽  
Wound Dressing ◽  
Bilayer Membrane ◽  
Diabetic Patients ◽  
Thickness Skin ◽  
Layer Membrane ◽  
Sponge Layer

The diabetic wounds do not heal easily in part because they are susceptible to infection due to environmental influences. Wound dressing is crucial to wound healing, as it can basically protect the wound from external damages and provide a suitable microenvironment for tissue regeneration. In this study, a double-layer membrane that consists of chitosan sponge and decellularized bovine amniotic membrane (dBAM) has been developed by freeze-casting method. The results showed that the porous structure of the sponge layer improved the performances of blood coagulation and swelling. The dense dBAM can optimize the mechanical property of wound dressing. In vitro studies revealed that the bilayer membrane had favorable biocompatible, especially for human foreskin fibroblast cells (HFF-1) cell adhesion and proliferation. Moreover, the full-thickness skin defects of diabetic model mice that treated with bilayer membrane showed over 80% closure in 8 days. Our findings imply that the double-layer dressing has great potentials to be used in diabetic patients.

scholarly journals Designing waterproof breathable material with moisture unidirectional transport characteristics based on a TPU/TBAC tree-like and TPU nanofiber double-layer membrane fabricated by electrospinning

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 32155-32163 ◽  
Author(s):  
Jingge Ju ◽  
Zhijie Shi ◽  
Nanping Deng ◽  
Yueyao Liang ◽  
Weimin Kang ◽  
...  
Keyword(s):  
Double Layer ◽  
Layer Membrane

The waterproof breathable double-layer membrane (inside was TPU-NMs and outside was TPU/TBAC-TLNMs) with both functions of protection and moisture unidirectional transport was successfully prepared by direct combination using electrospinning.

scholarly journals Biphasic Calcium Phosphate Sphere Graft Combined with a Double-Layer Non-Crosslinked Collagen Membrane Technique for Ridge Preservation: A Randomized Controlled Animal Study

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 18 ◽  
Author(s):  
Jungwon Lee ◽  
Young-Jun Lim ◽  
Bongju Kim ◽  
Ki-Tae Koo ◽  
Yong-Moo Lee
Keyword(s):  
Bone Graft ◽  
Double Layer ◽  
Single Layer ◽  
Test Group ◽  
Control Group ◽  
Collagen Membrane ◽  
Ridge Preservation ◽  
Graft Material ◽  
Membrane Technique ◽  
Layer Membrane

The purpose of this study was to compare the histologic and radiologic differences between single- and double-layer collagen membrane techniques in flapless ridge preservation. The mandibular fourth premolar and first molar of four beagle dogs were used in the experiment. Mesial roots of the teeth were extracted and root canal treatment was performed at the distal roots. Ridge preservation was performed at the extraction sites using synthetic bone graft material. A single layer (control group) or double layer (test group) of non-crosslinked collagen membrane was applied following bone graft application. Three months later, the animals were sacrificed and micro-computed tomography (micro-CT) and histomorphometric analyses were conducted. Nonparametric Mann–Whitney test was performed to compare between the control and test groups. The vertical difference between buccal and lingual crests of control and test groups was 1.28 ± 0.41 and 0.53 ± 0.37 mm, respectively (p = 0.026). The mineralized bone area in control and test groups was 31.48% ± 7.41% and 42.25% ± 9.73%, respectively (p = 0.041). Within the limit of this study, ridge preservation using the double-layer membrane technique showed a reduced buccal bone resorption and improved new-bone formation in the ridge compared to that using the single-layer membrane technique.

Fabrication and Evaluation of Diamond/SiC Double Layer Membrane for X‐Ray Mask

1997 ◽  
Vol 144 (9) ◽  
pp. 3304-3308 ◽  
Author(s):  
Hitoshi Noguchi ◽  
Yoshihiro Kubota ◽  
Takayuki Takarada
Keyword(s):  
Double Layer ◽  
X Ray ◽  
Layer Membrane

Gas flows through double-layer membrane of thermomolecular pump

2014 ◽  
Author(s):  
Friedlander Oscar ◽  
Nikolskiy Yuriy ◽  
Voronich Ivan
Keyword(s):  
Double Layer ◽  
Gas Flows ◽  
Layer Membrane

Light-Induced Hole Transfer Across a Langmuir-Blodgett Double-Layer Membrane with a Short Tunneling Barrier

1987 ◽  
Vol 91 (9) ◽  
pp. 869-873 ◽  
Author(s):  
F. Willig ◽  
R. Eichberger ◽  
K. Bitterling ◽  
W. S. Durfee ◽  
W. Storck ◽  
...  
Keyword(s):  
Double Layer ◽  
Tunneling Barrier ◽  
Hole Transfer ◽  
Langmuir Blodgett ◽  
Layer Membrane
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