Fabrication and Characterization of the Barrier Film Having Excellent Moisture Barrier Characteristics Using Polysilazane

2020 ◽  
Vol 20 (9) ◽  
pp. 5662-5666
Author(s):  
Sun Min Kim ◽  
Hyun Chul Kim ◽  
Jiwon Bang ◽  
Daeho Yoon ◽  
Eunhae Koo

Organic solar cell and OLED display devices are very sensitive to moisture, which leading to a fast degradation by the exposure to moisture and oxygen in the air. Therefore, in order to enhance the stability of the devices, a barrier film having WVTR (Water Vapor Transmission Rate) of 10−4 to 10−6 g/m2/day is required. In order to prepare the barrier film with excellent moisture blocking characteristics, perhydro polysilazane (PHPS) is used, which is developed to prepare an insulating film for semiconductors. Also a catalyst is added to lower the curing temperature to 100 °C or less. The result shows that the polysilazane is cured and converted to SiO2 under 100 °C in 30 min. WVTR of the polysilazane coated film is estimated to be 2.1×10−2 g/m2/day. In addition, when the inorganic layer such as SiO2 and Al2O3 is deposited on the planarization layer, the film shows excellent moisture blocking characteristics having WVTR to be 7.9×10−5 g/m2/day.

2014 ◽  
Vol 1626 ◽  
Author(s):  
Changfeng Chen ◽  
Li Liu ◽  
Qiong Wang ◽  
Tao Huang ◽  
Yue`e Fang

ABSTRACTThe present investigation involves the synthesis of chitosan based composite sponges in view of their applications in wound dressing, antibacterial and haemostatic. A facile CO2 bubbles template freeze-drying method was developed for the fabrication of macroporous chitosan- poly(vinyl alcohol) (PVA) composite sponges with a typical porosity of 50% and pore size of 100-300 µm. The composite sponges show a high water absorption rate up to 60 times of its weight and a water vapor transmission rate of 30 ∼ 70g/m2 • h. Effects of the content of cross-linking agent and PVA on mechanical properties and moisture permeability were examined. Improved strength and flexibility of the chitosan sponges were observed with the presence of PVA. Further, the antibacterial and haemostatic activities have been demonstrated. The Chitosan/PVA sponges of high liquid absorption, appropriate moisture permeability, excellent antimicrobial and haemostatic activities have a great potential for wound dressing applications.


Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3340 ◽  
Author(s):  
Xiaoning Zhang ◽  
Zhenyu Chen ◽  
Hong Bao ◽  
Jianwei Liang ◽  
Shui Xu ◽  
...  

In the present work, a sustained-release film composed of silk fibroin (SF), curcumin (Cur), glutaraldehyde (GA), and glycerol (Gly) was prepared successfully for wound dressings. Features relevant to wound dressings of SF/Gly/GA/Cur film were assessed. Physical and chemical properties of the fabricated materials were also characterized. The results showed that the prepared SF/Gly/GA/Cur film demonstrated a good sustained-release performance, flexibility, and gas permeability. In addition, it was found that the prepared SF/Gly/GA/Cur film possessed the capability to effectively inhibit the growth of bacteria and prevent bacterial penetration with a suitable water vapor transmission rate. Furthermore, the prepared composite film was non-cytotoxic, which makes it an ideal material for wound dressings.


Author(s):  
N. David Theodore ◽  
Leslie H. Allen ◽  
C. Barry Carter ◽  
James W. Mayer

Metal/polysilicon investigations contribute to an understanding of issues relevant to the stability of electrical contacts in semiconductor devices. These investigations also contribute to an understanding of Si lateral solid-phase epitactic growth. Metals such as Au, Al and Ag form eutectics with Si. reactions in these metal/polysilicon systems lead to the formation of large-grain silicon. Of these systems, the Al/polysilicon system has been most extensively studied. In this study, the behavior upon thermal annealing of Au/polysilicon bilayers is investigated using cross-section transmission electron microscopy (XTEM). The unique feature of this system is that silicon grain-growth occurs at particularly low temperatures ∽300°C).Gold/polysilicon bilayers were fabricated on thermally oxidized single-crystal silicon substrates. Lowpressure chemical vapor deposition (LPCVD) at 620°C was used to obtain 100 to 400 nm polysilicon films. The surface of the polysilicon was cleaned with a buffered hydrofluoric acid solution. Gold was then thermally evaporated onto the samples.


2019 ◽  
Vol 35 (4) ◽  
pp. 475-484
Author(s):  
SHIVA ARUN ◽  
◽  
PRABHA BHARTIYA ◽  
AMREEN NAZ ◽  
SUDHEER RAI ◽  
...  

2019 ◽  
Vol 139 (11) ◽  
pp. 375-380
Author(s):  
Harutoshi Takahashi ◽  
Yuta Namba ◽  
Takashi Abe ◽  
Masayuki Sohgawa

2015 ◽  
Vol 135 (11) ◽  
pp. 474-475
Author(s):  
Koji Sugano ◽  
Ryoji Hiraoka ◽  
Toshiyuki Tsuchiya ◽  
Osamu Tabata

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