Quantitative characterization of interface stress using a nanoindentation technique for high performance flexible electronics

2020 ◽  
Vol 8 (35) ◽  
pp. 12155-12163
Author(s):  
Xiumei Wang ◽  
Guocheng Zhang ◽  
Huihuang Yang ◽  
Yaqian Liu ◽  
Shaomin Chen ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Formation Process ◽  
High Performance ◽  
Film Formation ◽  
Adhesion Energy ◽  
Interface Stress ◽  
Quantitative Characterization ◽  
Interface Adhesion ◽  
Simple Method

A simple method was introduced to precisely characterize the interface stress of flexible OFETs using nanoindentation. The interface stress could be tuned by controlling the interface adhesion energy between layers, via controlling the film formation process.

Delamination-Based Measurement and Prediction of the Adhesion Energy of Thin Film/Substrate Interfaces

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Liangliang Zhu ◽  
Xi Chen
Keyword(s):  
Thin Film ◽  
Flexible Electronics ◽  
Current Method ◽  
Adhesion Energy ◽  
Two Dimensional ◽  
Soft Substrate ◽  
Interface Adhesion ◽  
Compliant Substrates ◽  
And Performance ◽  
Film Substrate

With the rapid emerging of two-dimensional (2D) micro/nanomaterials and their applications in flexible electronics and microfabrication, adhesion between thin film and varying substrates is of great significance for fabrication and performance of micro devices and for the understanding of the buckle delamination mechanics. However, the adhesion energy remains to be difficult to be measured, especially for compliant substrates. We propose a simple methodology to deduce the adhesion energy between a thin film and soft substrate based on the successive or simultaneous emergence of wrinkles and delamination. The new metrology does not explicitly require the knowledge of the Young's modulus, Poisson's ratio, and thickness of the 2D material, the accurate measurement of which could be a challenge in many cases. Therefore, the uncertainty of the results of the current method is notably reduced. Besides, for cases where the delamination width is close to the critical wrinkle wavelength of the thin film/substrate system, the procedure can be further simplified. The simple and experimentally easy methodology developed here is promising for determining/estimating the interface adhesion energy of a variety of thin film/soft substrate systems.

Quantitative characterization of membrane formation process of alginate–chitosan microcapsules by GPC

2010 ◽  
Vol 346 (2) ◽  
pp. 296-301 ◽  
Author(s):  
Weiting Yu ◽  
Junzhang Lin ◽  
Xiudong Liu ◽  
Hongguo Xie ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Formation Process ◽  
Quantitative Characterization ◽  
Membrane Formation

A simple method for defect area detection using active thermography

2009 ◽  
Vol 17 (4) ◽  
Author(s):  
S. Dudzik
Keyword(s):  
Thermal Diffusivity ◽  
Infrared Thermography ◽  
Subsurface Layer ◽  
Quantitative Characterization ◽  
Simple Method ◽  
Active Thermography ◽  
Active Infrared Thermography ◽  
Defect Area

AbstractIn this paper a simple method for defect area detection in the subsurface layer of materials was presented. The method uses active infrared thermography. A statistical detectivity ratio was introduced for a quantitative characterization of areas containing defects. The described algorithm of defect area detection was tested for a material with a low thermal diffusivity. The results of experimental and simulation investigations are presented. It was stated that the statistical detectivity ratio can be used to detect regions of defect presence, even for the non-uniformly heated surfaces.

scholarly journals Preparation and Property Research of Strain Sensor Based on PDMS and Silver Nanomaterials

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Lihua Liu ◽  
Qiang Zhang ◽  
Dong Zhao ◽  
Aoqun Jian ◽  
Jianlong Ji ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
High Performance ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Thermal Method ◽  
Simple Method ◽  
Current Trends ◽  
Silver Nanomaterials ◽  
Highly Sensitive

Based on the advantages and broad applications of stretchable strain sensors, this study reports a simple method to fabricate a highly sensitive strain sensor with Ag nanomaterials-polydimethylsiloxane (AgNMs-PDMS) to create a synergic conductive network and a sandwich-structure. Three Ag nanomaterial samples were synthesized by controlling the concentrations of the FeCl3 solution and reaction time via the heat polyols thermal method. The AgNMs network’s elastomer nanocomposite-based strain sensors show strong piezoresistivity with a high gauge factor of 547.8 and stretchability from 0.81% to 7.26%. The application of our high-performance strain sensors was demonstrated by the inducting finger of the motion detection. These highly sensitive sensors conform to the current trends of flexible electronics and have prospects for broad application.

Preparation and Characterization of NH2-Terminal Fibrinogen Bβ Fragments from N-DSK of Human Fibrinogen

1984 ◽  
Vol 51 (01) ◽  
pp. 016-021 ◽  
Author(s):  
S Birken ◽  
G Agosto ◽  
B Lahiri ◽  
R Canfield
Keyword(s):  
High Performance ◽  
Gel Filtration ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Reverse Phase ◽  
Human Fibrinogen ◽  
Human Volunteers ◽  
Cnbr Cleavage ◽  
Two Peaks

SummaryIn order to investigate the early release of NH2-terminal plasmic fragments from the Bβ chain of fibrinogen, substantial quantities of Bβ 1-42 and Bβ 1-21 are required as immunogens, as radioimmunoassay standards and for infusion into human volunteers to determine the half-lives of these peptides. Towards this end methods that employ selective proteolytic cleavage of these fragments from fibrinogen have been developed. Both the N-DSK fragment, produced by CNBr cleavage of fibrinogen, and Bβ 1-118 were employed as substrates for plasmin with the finding of higher yields from N-DSK. Bβ 1-42 and Bβ 1-21 were purified by gel filtration and ion-exchange chromatography on SP-Sephadex using volatile buffers. When the purified preparation of Bβ 1-42 was chromatographed on reverse-phase high performance liquid chromatography, two peaks of identical amino acid composition were separated, presumably due either to pyroglutamate or to amide differences.

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