scholarly journals A porous PDMS pulsewave sensor with haircell structures for water vapor transmission rate and signal-to-noise ratio enhancement

2021 ◽  
Author(s):  
Minho Seok ◽  
Sunghyun Yoon ◽  
Mookyum Kim ◽  
Young-Ho Cho
Keyword(s):  
Water Vapor ◽  
Transmission Rate ◽  
Signal To Noise Ratio ◽  
Water Vapor Transmission Rate ◽  
Signal To Noise ◽  
Water Vapor Transmission ◽  
Noise Ratio

We present a porous polydimethylsiloxane (PDMS) pulsewave sensor with haircell structures that improves both water vapor transmission rate (WVTR) and signal-to-noise ratio (SNR).

scholarly journals Preparing of Cornstarch (Zea mays) Bioplastic Using ZnO Metal

2018 ◽  
Vol 1 (1) ◽  
pp. 23
Author(s):  
Nurwani Hayati ◽  
Lazulva Lazulva
Keyword(s):  
Tensile Strength ◽  
Zea Mays ◽  
Water Vapor ◽  
Water Content ◽  
Transmission Rate ◽  
Test Results ◽  
Mixing Process ◽  
Water Vapor Transmission Rate ◽  
Water Vapour Transmission Rate ◽  
Water Vapor Transmission

The manufacture of the bioplastic was done through the mixing process using an aquades solvent with a ratio massa 10 gram and 7 gram cornstarch, 150 mL aquades, 2 Ml glycerol and 0,5 gram ZnO. This study aim to find out physical characteristies (water vapour transmission rate, water content, thickness,biodegradation) and mechanical charateristics (tensile strength, elongasi, modulus young) are made of cornstrach (Zea mays) using ZnO metal. From the test results tensile strength was 2.744-4.018 Mpa, percentage of elongation was 28.4632.383%, modulus young’s was 8.9031026535-14.08617709Mpa, thickness was 0.16-0.29mm, water vapor transmission rate was 0.4329-1.52525g/m2.24 hours, water content was 13.5-14.5%, and biodegradation was 3.7798-7.0346% and 455-809 days.

Active Starch/PVA Composite Films Containing Syzygium oleana for Ammonia Vapor Colorimetric Indicators

2020 ◽  
Vol 990 ◽  
pp. 318-324
Author(s):  
Arie Listyarini ◽  
Windri Handayani ◽  
Vivi Fauzia ◽  
Cuk Imawan
Keyword(s):  
Tensile Strength ◽  
Water Vapor ◽  
Color Change ◽  
Transmission Rate ◽  
Composite Films ◽  
Ammonia Vapor ◽  
Water Vapor Transmission Rate ◽  
Food Spoilage ◽  
Water Vapor Transmission ◽  
Food Freshness

Ammonia is one of the compounds released during the food spoilage process, so a device that can detect ammonia can be used as an indicator of food spoilage. This article reports on the preparation and characteristics of Starch/PVA composite films with Syzygium oleana as indicator films to detect ammonia vapor. The indicator was made by first preparing the starch / PVA composite films by casting method and then the films were dipped in Syzygium oleana extract. These films were characterized by using a UV-Vis spectrophotometer, Fourier Transformed Infra-Red Spectrophotometer and tested for mechanical properties such as tensile strength and elongation, and the water vapor transmission rate (WVT). The results showed that the addition of PVA reduced the absorbance value in the UV and visible area, the value of the water vapor transmission rate and the tensile strength but the elongation value of the film on the other hand rose. The indicator films can detect ammonia which was marked by its color change from red to blue. For further application, it can be used as a smart packaging label that can detect food freshness.

scholarly journals High Oxygen and Water-Vapor Transmission Rate and In Vitro Cytotoxicity Assessment with Illite-Polyethylene Packaging Films

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2382
Author(s):  
Dong Min Seong ◽  
Heysun Lee ◽  
Jungbae Kim ◽  
Jeong Ho Chang
Keyword(s):  
Water Vapor ◽  
Composite Film ◽  
Transmission Rate ◽  
In Vitro Cytotoxicity ◽  
Banana Peel ◽  
Water Vapor Transmission Rate ◽  
Oxygen Transmission Rate ◽  
Water Vapor Transmission ◽  
Twin Screw

This work reports the preparation of a ceramic hybrid composite film with illite and polyethylene (illite-PE), and the evaluation of the freshness-maintaining properties such as oxygen transmission rate (OTR), water vapor transmission rate (WVTR), tensile strength, and in vitro cytotoxicity. The particle size of the illite material was controlled to within 10 μm. The illite-PE masterbatch and film were prepared using a twin-screw extruder and a blown film maker, respectively. The dispersity and contents of illite material in each masterbatch and composite film were analyzed using a scanning electron microscope (SEM) and thermogravimetric analyzer (TGA). In addition, the OTR and WVTR of the illite-PE composite film were 8315 mL/m2·day, and 13.271 g/m2·day, respectively. The in vitro cytotoxicity of the illite-PE composite film was evaluated using L929 cells, and showed a cell viability of more than 92%. Furthermore, the freshness-maintaining property was tested for a packaging application with bananas; it was found to be about 90%, as indicated by changes in the color of the banana peel, after 12 days.

Effect of Anthocyanin Preparations as Colorants on Hygroscopicity of Dry-Pack Foods

1979 ◽  
Vol 42 (3) ◽  
pp. 225-227 ◽  
Author(s):  
F. M. CLYDESDALE ◽  
J. H. MAIN ◽  
F. J. FRANCIS ◽  
K. M. HAYES
Keyword(s):  
Water Vapor ◽  
Relative Humidity ◽  
Transmission Rate ◽  
Packaging Material ◽  
Physical Parameters ◽  
Water Vapor Transmission Rate ◽  
Natural Colorants ◽  
Water Vapor Transmission ◽  
Grape Skins ◽  
Equilibrium Relative Humidity

The equilibrium relative humidity isotherm of a cherry beverage base and a strawberry gelatin dessert mix colored with anthocyanins from grape skins, cranberries and roselle was evaluated versus a Red No. 2 control. As well, the water vapor transmission rate of the packaging material was evaluated to evaluate probable shelf-life. Results indicated that physical parameters, such as hygroscopicity, must be considered in estimating effects of the use of natural colorants in foods as well as the color and chemical stability normally investigated.

scholarly journals l-Arginine Grafted Poly(Glycerol Sebacate) Materials: An Antimicrobial Material for Wound Dressing

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1457 ◽  
Author(s):  
Chia-Chun Wang ◽  
Ting-Yu Shih ◽  
Yi-Ting Hsieh ◽  
Jie-Len Huang ◽  
Jane Wang
Keyword(s):  
Water Vapor ◽  
Wound Dressing ◽  
Transmission Rate ◽  
Water Vapor Transmission Rate ◽  
Grafting Ratio ◽  
Chemical Conjugation ◽  
Water Vapor Transmission ◽  
Antimicrobial Material ◽  
Series Of Experiments ◽  
And Staphylococcus Aureus

This study focuses on the development and evaluation of a novel wound dressing material. l-arginine grafted poly(glycerol sebacate) materials (PGS-g-Arg) are developed by chemical conjugation of l-arginine on poly(glycerol sebacate) chains and the mechanical property, water vapor transmission rate, antimicrobial functions and biocompatibility are investigated. At various l-arginine grafting ratio, the mechanical properties are tunable. It was found that between 7–13% l-arginine grafting ratios, the tensile strengths of PGS-g-Arg were similar to that of natural skin. These materials are shown with a low water vapor transmission rate, 6.1 to 10.3 g/m2/h, which may form a barrier and assist in the closure of wounds. Inhibition in the growth of Pseudomonas aeruginosa and Staphylococcus aureus was observed on PGS-g-Arg, and a series of experiments were conducted to confirm its biocompatibility. In summary, l -arginine grafted poly(glycerol sebacate) may offer a novel option for wound dressing.

Water Vapor Transmission Properties of Men’s Quick-Dry Sportswear

2020 ◽  
Vol 897 ◽  
pp. 30-34
Author(s):  
Yan Ngo Fan ◽  
Wen Yi Wang ◽  
Chi Wai Kan ◽  
Kamol Promlawan ◽  
Wasana Changmuong ◽  
...  
Keyword(s):  
Water Vapor ◽  
Transmission Rate ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Water Vapor Transmission Rate ◽  
Similar Performance ◽  
Transmission Properties ◽  
Water Vapor Transmission

This study evaluated the quick dry properties of summer men’s sportswear T-shirts of different brands (Nike, Adidas, Laishilong and Columbia) by studying the water vapor transmission behavior. The results indicate that Laishilong was the best sample in terms of water vapor transmission rate, whereas Columbia was the poorest. Moreover, samples of Nike, Adidas, Laishilong and Columbia, had similar water vapor transmission rate. This implies that they had comparatively similar performance in water vapor permeability.

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