Fabrication of Nanocomposite Thin Film of Hydroxyapatite and Polyvinylalcohol and its Ionic Conductive Properties

2004 ◽  
Vol 847 ◽  
Author(s):  
Toshihiko Takaki ◽  
Kazuyuki Fukuda ◽  
Yoshiro Tajitsu
Keyword(s):  
Ionic Conductivity ◽  
Nanocomposite Film ◽  
Casting Method ◽  
Film Properties ◽  
Gas Barrier ◽  
Pencil Hardness ◽  
In Situ Method ◽  
Carboxylic Groups ◽  
Conductive Properties

ABSTRACTA hydroxyapatite (HAp)-polyvinylalcohol (PVA) nanocomposite was prepared by the in-situ method. When the HAp was synthesized by reacting Ca(OH)2 with H3PO4 in the presence of PVA having carboxyl groups, the interaction between the carboxylic groups of PVA and calcium ions of HAp led to the formation of nanometer-sized spindle HAp particles (long axis ca. 80 nm and short axis ca. 25 nm). The reactant was stable and formed transparent thin films by the casting method. Nanometer-sized HAp particles were uniformly dispersed in PVA film. Properties of the HAp-PVA nanocomposite film, such as tensile strength, gas barrier, and pencil hardness, were superior to those of the pure PVA. Furthermore, the nanocomposite film had high ionic conductivity compared to pure PVA and traditional composite. The ionic conductivity of the stretched film (PVA: HAp = 1:1) with 35wt % content of LiN(CF3SO2)2 was about 10-3 S/m at room temperature. Regarding the mechanism of this study, we believe that the HAp particles play a crucial role in increasing the free lithium cations to accelerate the ionic conductivity, according to the ionic interaction on the HAp surface.

scholarly journals Application of Furcellaran Nanocomposite Film as Packaging of Cheese

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1428
Author(s):  
Agnieszka Pluta-Kubica ◽  
Ewelina Jamróz ◽  
Gohar Khachatryan ◽  
Adam Florkiewicz ◽  
Pavel Kopel
Keyword(s):  
Silver Nanoparticles ◽  
Nanocomposite Film ◽  
Microbiological Quality ◽  
Inhibitory Effect ◽  
Quality Properties ◽  
In Situ Method ◽  
And Migration ◽  
Total Bacteria

There is a serious need to develop and test new biodegradable packaging which could at least partially replace petroleum-based materials. Therefore, the objective of this work was to examine the influence of the recently developed furcellaran nanocomposite film with silver nanoparticles (obtained by an in situ method) on the quality properties of two cheese varieties: a rennet-curd (gouda) and an acid-curd (quark) cheese. The water content, physicochemical properties, microbiological and organoleptic quality of cheese, and migration of silver nanoparticles were examined. Both the number of Lactococcus and total bacteria count did not differ during storage of gouda regardless of the packaging applied. The number of Lactococcus decreased in analogous quark samples. The use of the film slowed down and inhibited the growth of yeast in gouda and quark, respectively. An inhibitory effect of this film on mold count was also observed; however, only regarding gouda. The level of silver migration was found to be lower in quark than in gouda. The film improved the microbiological quality of cheeses during storage. Consequently, it is worth continuing research for the improvement of this film in order to enable its use in everyday life.

The research progress of Li-ion battery separators with inorganic oxide nanoparticles by electrospinning: A mini review

2016 ◽  
Vol 09 (05) ◽  
pp. 1630003 ◽  
Author(s):  
Hong-Li Chen ◽  
Xiao-Ning Jiao ◽  
Jin-Tao Zhou
Keyword(s):  
Thermal Stability ◽  
Ionic Conductivity ◽  
Lithium Ion ◽  
Research Progress ◽  
Oxide Nanoparticles ◽  
Li Ion Battery ◽  
Inorganic Oxide ◽  
In Situ Method ◽  
Li Ion

The technology of Lithium-ion battery (LIB) separator has become more and more mature. But there are still many problems that needed to be resolved. For example, its mechanical strength is low relatively, thermal stability is bad and the porosity and electrochemical performance are imperfect. This paper introduces modification of electrospinning LIB separator from the way of adding nanoparticles, including SiO2, TiO2, Al2O3 and copper titanate oxide, etc. And addition methods include dissolving in dispersant, dissolving in polymer solution, coating and in situ method. The modified membranes possess higher ionic conductivity which can reach to the level of 10[Formula: see text][Formula: see text]s/cm.

Enhanced room temperature ionic conductivity of the LiBH4·1/2NH3–Al2O3 composite

2021 ◽  
Author(s):  
Ruixue Zhang ◽  
Wanying Zhao ◽  
Zhenzhen Liu ◽  
Shanghai Wei ◽  
Yigang Yan ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Ion Conductivity ◽  
Al2o3 Composite

In situ formed amorphous LiBH4·1/2NH3 on the surface of Al2O3 nanoparticles results in an enhanced ion conductivity of 1.1 × 10−3 S cm−1 at room temperature.

Photocatalytic degradation of tetracycline under visible light using TiO2@sulfur doped carbon nitride nanocomposite synthesized via in-situ method

2021 ◽  
Vol 9 (4) ◽  
pp. 105560
Author(s):  
Krishnan Divakaran ◽  
Amanulla Baishnisha ◽  
Vellaichamy Balakumar ◽  
Krishnan Nattamai Perumal ◽  
Chandran Meenakshi ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Carbon Nitride ◽  
In Situ Method

scholarly journals The Influence of Starch Origin on the Properties of Starch Films: Packaging Performance

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1146
Author(s):  
Zuzanna Żołek-Tryznowska ◽  
Alicja Kałuża
Keyword(s):  
Tensile Strength ◽  
Free Energy ◽  
Surface Free Energy ◽  
Food Packaging ◽  
Energy Surface ◽  
Free Energy Surface ◽  
Casting Method ◽  
Starch Solution ◽  
Film Properties ◽  
Starch Films

Starch films can be used as materials for food packaging purposes. The goal of this study is to compare how the starch origin influence the selected starch film properties. The films were made from various starches such as that from maize, potato, oat, rice, and tapioca using 50%w of glycerine as a plasticizer. The obtained starch-based films were made using the well-known casting method from a starch solution in water. The properties of the films that were evaluated were tensile strength, water vapour transition rate, moisture content, wettability, and their surface free energy. Surface free energy (SFE) and its polar and dispersive components were calculated using the Owens-Wendt-Rabel-Kaelbe approach. The values of SFE in the range of 51.64 to 70.81 mJ∙m−2 for the oat starch-based film and the maize starch-based film. The films revealed worse mechanical properties than those of conventional plastics for packaging purposes. The results indicated that the poorest tensile strength was exhibited by the starch-based films made from oat (0.36 MPa) and tapioca (0.78 MPa) and the greatest tensile strength (1.49 MPa) from potato.

Sign in / Sign up

Export Citation Format

Share Document