scholarly journals Highly Efficient, Flexible, and Recyclable Air Filters Using Polyimide Films with Patterned Thru-Holes Fabricated by Ion Milling

2019 ◽  
Vol 9 (2) ◽  
pp. 235 ◽  
Author(s):  
Sang-Jun Choi ◽  
Kyung Kim ◽  
Hyun Kim ◽  
Jun Yoon ◽  
Mi Lee ◽  
...  
Keyword(s):  
Tap Water ◽  
Electrostatic Force ◽  
Polyimide Film ◽  
Ion Milling ◽  
Polyimide Films ◽  
Environmental Application ◽  
Air Filter ◽  
Air Conditioners ◽  
Highly Efficient ◽  
High Work

We present the first demonstration of the environmental application of a polyimide film (Kapton) with patterned thru-holes as a novel, efficient, flexible, recyclable, and active particulate matter (PM) air filter. The Kapton air filter captures PM using micro-sized thru-holes and the strong electrostatic force because of its high work function. It is highly efficient, transparent, flexible, and heat-resistant. Furthermore, it can be recycled simply by washing it with tap water. The proposed PM filter is a promising candidate for use as a highly efficient and economical recyclable air filter for home appliances, such as air-purifiers, air-conditioners, and humidifiers, as well as industrial filtration systems.

DEVELOPMENT OF A RAPID CONTINUOUS FLOW SALT LEACHING KIT FOR FABRICATION OF POLY(3-HYDROXYBUTYRIC ACID-CO-3-HYDROXYVALERATE) (PHBV) POROUS 3-D SCAFFOLD

2015 ◽  
Vol 75 (1) ◽  
Author(s):  
Syazwan Aizad ◽  
Badrul Hisham Yahaya ◽  
Saiful Irwan Zubairi
Keyword(s):  
Conventional Method ◽  
Continuous Flow ◽  
Tap Water ◽  
Chemical Properties ◽  
Porous Scaffolds ◽  
Time Saving ◽  
Salt Particle ◽  
Salt Leaching ◽  
Leaching Process ◽  
Highly Efficient

Polyhydroxyalkanoates (PHAs) that are synthesized from bacteria that are predominantly produced by microbial fermentation processes on organic waste, such as palm oil mill effluent (POME), olive oil and kitchen waste, contribute to a sustainable waste management. A great variety of materials from this family can be produced, however the application of PHAs in the production of scaffolds in tissue engineering has been mainly constrained to poly(hydroxybutyrate-co-valerate) (PHBV) due to its highly adjustable physico-chemical properties. One of the common methods in making the 3-D scaffolds is by performing solvent-casting particulate-leaching (SCPL) process, but this process requires a long period of soaking in water to extract the entire salt particle in the 3-D scaffolds. Therefore, the objective of this study is to develop a new method to the conventional method of salt leaching process via a highly efficient continuous flow leaching kit. The salt leaching process was carried out by (1) immersing the 3-D porous scaffolds in a fabricated static container containing tap water and (2) by allowing a pre-setting continuous flow rate of water. The concentration of sodium chloride (NaCl) was calculated periodically for both processes based on the salt standard calibration curve. The results showed that the exhaustive salt leaching of the conventional process occurred at 48 ± 5 hrs with the needs of changing the water twice a day. In contrast, the exhaustive salt leaching process via continuous flow leaching kit occurred at 40 ± 5 mins, 72 times faster than the conventional method (p<0.05). Therefore, the salt leaching process using continuous flow leaching kit can be considered a highly efficient and time saving procedure as compared to the conventional method.  

Enhancement of Adhesion Between Cu Thin Film and Polyimide Modified by Ion Assisted Reaction

1997 ◽  
Vol 504 ◽  
Author(s):  
S. C. Choi ◽  
K. H. Kim ◽  
H-J. Jung ◽  
C. N. Whang ◽  
S. K. Koha
Keyword(s):  
Ion Irradiation ◽  
Polyimide Film ◽  
Wetting Angle ◽  
Free Energies ◽  
Polyimide Films ◽  
Oxygen Environment ◽  
X Ray ◽  
Oxygen Ion ◽  
Oxygen Gas ◽  
Cu Thin Film

ABSTRACTPolyimide films are modified by ion assisted reaction method using various ion beams in various gases environments. Amount of ion and blown gases rate were changed from 5 × 1014 to 1 × 1017 and from 0 to 8 sccm, respectively. Wetting angles between water and polyimide films modified by Ar+ ion without oxygen blowing decrease from 67° to 400° and surface free energies increase from 46 to 64 dyne/cm2. Wetting angle of polyimide films modified by Ar+ ion in an oxygen environment decreases to 12° and surface free energy increases to 72 dyne/cm2. The lowest wetting angle was obtained by oxygen ion irradiation in the oxygen gas environment and its value was 7°. In the case of polyimide film modified by Ar+ ions in an oxygen environment, the wetting angle increases up to 65° when it kept in air and that increases up to 46° when it kept in water after 5 day. In the case of polyimide film modified by O2+ ion in oxygen environment, however, the wetting angle of polyimide film dose not increase. X-ray photoelectron analysis shows that the chemical bonds between polyimide components are severed by ion irradiation and hydrophilic groups such as CO and C=O are formed by the reaction between newly formed radicals and blown oxygen. It was found that adhesion between Cu and polyimide modified by ion assisted reaction was improved. The main reason of the enhanced adhesion is due to the reaction between Cu and C-O or C=O groups formed by ion assisted reaction on the polyimide surface.

scholarly journals Surface characterization and degradation behavior of polyimide films induced by coupling irradiation treatment

RSC Advances ◽  
2018 ◽  
Vol 8 (49) ◽  
pp. 28152-28160 ◽  
Author(s):  
Shan-Shan Dong ◽  
Wen-Zhu Shao ◽  
Li Yang ◽  
Hui-Jian Ye ◽  
Liang Zhen
Keyword(s):  
Surface Characterization ◽  
Degradation Process ◽  
Polyimide Film ◽  
Degradation Behavior ◽  
Polyimide Films ◽  
Irradiation Treatment ◽  
Coupling Treatment

Schematic of irradiation-load-heating coupling treatment and degradation process of polyimide film.

Orientation Specific Thermal Properties of Polyimide Film

2000 ◽  
Vol 123 (3) ◽  
pp. 273-277 ◽  
Author(s):  
Robert J. Samuels ◽  
Nancy E. Mathis
Keyword(s):  
Thermal Conductivity ◽  
Heat Dissipation ◽  
Polyimide Film ◽  
New Materials ◽  
Polyimide Films ◽  
Nondestructive Technique ◽  
Theoretical Understanding ◽  
First Time ◽  
The Relationship ◽  
Transfer Mechanisms

The present study examines the relationship between thermal conductivity and planarity in polyimide films. The samples tested were specially prepared to range in orientation from three dimensionally random to highly planar. The molecular structure and orientation of the polyimide film have been characterized by polarizing microscope techniques, while the thermal conductivity measurements were done using a new rapid nondestructive technique. This correlation represents the first time thermal conductivity has been measured by modified hot wire techniques and related to the internal structure of polyimide. This work contributes to a deeper theoretical understanding of thermal conductivity and heat transfer mechanisms as they relate to orientation. Thermal conductivity evaluation could provide a new tool in the arsenal of structural characterization techniques. This relationship between thermal conductivity and orientation is key for applications of directional heat dissipation in the passive layers of chip assemblies. Such a correlation has potential to speed the development cycles of new materials during formulation as well as assure properties during production.

Residual Stress Measurements on Cr/Ni Pads Evaporated on Polyimide Thin Films

1992 ◽  
Vol 36 ◽  
pp. 203-212
Author(s):  
C. C. Goldsmith ◽  
C. Van Buskirk
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Thermal Processing ◽  
Polyimide Film ◽  
Metal Films ◽  
Dielectric Films ◽  
Nickel Layer ◽  
Polyimide Films ◽  
Layer Structures ◽  
Deposited Metal

AbstractPolyimide films are becoming more important in multi-layer structures, acting as dielectric films to separate conductive layers. High thin film residual stresses can cause problems with the polyimide film, leading to loss of adhesion between the metal film and the polyimide or can cause cracking in the polyimide.In this paper, we examine the residual stresses in “as deposited” metal films evaporated onto BTDA-APB polyimide films and follow the change in residual stress of the nickel layer during subsequent thermal processing. We will show that the change in residual stresses can be correlated to the glass transition temperature of the polyimide film.

Preparation and Characterization Silver and Copper Layers on Polyimide Prepared by Electroless Copper Plating

2006 ◽  
Vol 947 ◽  
Author(s):  
Eun Sun Ji ◽  
Young Hwan Kim ◽  
Young Soo Kang
Keyword(s):  
Polyimide Film ◽  
Metallic Silver ◽  
Polyimide Films ◽  
Electroless Copper Plating ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ag Particles ◽  
Plating Method ◽  
Surface Image

ABSTRACTAg particles were generated on Ag+-doped polyimide film by ion exchanging, followed by copper deposition using metallic silver particles as seeds. The Cu layers were coated on the surface of polyimide films by electroless plating method. The surface image and morphology of Cu layers on the polyimide films were characterized with scanning electron microscopy (SEM), and atomic force microscopy (AFM). The chemical composition on the PI film was investigated energy dispersive X-ray (EDX) spectrometer.

Solvent Diffusion in Selected Polyimide Films

1989 ◽  
Vol 167 ◽  
Author(s):  
W. P. Pawlowski ◽  
M. I. Jacobson ◽  
M. E. Teixeira ◽  
K. G. Sakorafos
Keyword(s):  
Methylene Chloride ◽  
Rutherford Backscattering Spectrometry ◽  
Polyimide Film ◽  
Rutherford Backscattering ◽  
Polyimide Films ◽  
Solvent Diffusion ◽  
Additional Information ◽  
Methyl Chloroform ◽  
Significant Difference ◽  
Mode Of Transport

AbstractThe absorption of several solvents including methylene chloride (MC), methyl chloroform (MCF), gamma-butyrolactone (BLO), dibromomethane (DBRO), 1,2-dichloroethane (DCE), and 1,2-dichloropropane (DCP) in Kapton H*, Upilex S**, and Upilex R** polyimide film was measured gravimetrically. A significant difference in the rate and amount of absorption of these chemicals by the various films was observed. Complimentary Rutherford Backscattering Spectrometry (RBS) measurements provided additional information regarding the amount of solvent absorbed and mode of transport.

Design and Technology of Winding Curvilinear Pipelines from Sintered Polyimide-Fluoroplastic Film

2019 ◽  
pp. 86-92
Author(s):  
M.A. Komkov ◽  
Y.V. Badanina
Keyword(s):  
Composite Materials ◽  
Polyimide Film ◽  
Design And Technology ◽  
Hydraulic Systems ◽  
Polyimide Films ◽  
Typical Element ◽  
Land Vehicles ◽  
Bending Loads ◽  
Cryogenic Pipeline

This article deals with the issues related to designing and manufacturing light and reliable pipelines made of composite materials for missile technology, aircraft and land vehicles running on cryogenic fuel. Multi-layer straight and curvilinear pipelines made by winding polyimide films can significantly reduce the weight and level of bending loads. The article presents the geometry of a typical element of a curvilinear pipeline and the design of the flange of a cryogenic pipeline. A method for connecting the flange shank to the film shell is proposed and the results of testing pipelines made of polyimide-fluoroplastic films are presented. Cryogenic pipelines made of polyimide film PMF-352 have a smaller mass in comparison with metal analogues made of alloy AMg-6 and can be recommended as their replacement in pneumatic hydraulic systems of products operating on cryogenic fuels.

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