Bulge Test on Free Standing Gold Thin Films

2003 ◽  
Vol 795 ◽  
Author(s):  
Yawen Li ◽  
Michael J. Cima
Keyword(s):  
Gold Film ◽  
Composite Films ◽  
Pure Gold ◽  
Bulge Test ◽  
Gold Films ◽  
Free Standing ◽  
Film Properties ◽  
Dense Microstructure ◽  
Mems Device ◽  
Bulk Gold

ABSTRACTBulge test was performed on gold and gold/nitride composite films with in plane sizes ranging from 20 to 200μm. The films were prepared using the microfabrication process of a drug delivery MEMS device, and the bulge test setup was constructed using some of the packaging components of the device. Incremental pressure at 5psi interval was applied to the films, whose deflection was measured using interferometry. The extracted gold film properties from bulge test on either pure gold films or composite films yielded comparable values. The lower modulus (126∼168 GPa) comparing with the bulk gold could be due to the less dense microstructure of the evaporated gold film.

Tensile Behavior of Free-Standing Gold Films

1997 ◽  
Vol 472 ◽  
Author(s):  
R.D. Emery ◽  
D.X. Lenshek ◽  
B. Behin ◽  
M. Gherasimova ◽  
G.L. Povirk
Keyword(s):  
Thin Film ◽  
Tensile Strength ◽  
Tensile Testing ◽  
Metal Film ◽  
Tensile Behavior ◽  
Gold Films ◽  
Free Standing ◽  
Microelectronic Fabrication ◽  
Silicon Frame ◽  
Bulk Gold

ABSTRACTA method for tensile testing thin gold films is presented. Free-standing tensile specimens were prepared by evaporating 0.8 μm of gold onto a patterned oxidized silicon wafer. Using common microelectronic fabrication techniques, free-standing thin film specimens were produced that span rectangular windows in the wafer. The wafer was diced into individual tensile specimens composed of a thin film surrounded by a silicon frame. The final step before testing was to cleave the silicon frame so that the load was completely carried by the metal film. The ultimate tensile strength of the films was found to be approximately 150% greater than that of annealed bulk gold. In contrast, the measured elastic modulus for the thin film specimens was approximately the same as that documented for bulk gold.

scholarly journals Durable Biopolymer Films From Lignin-Carbohydrate Complex Derived From a Pulp Mill Side Stream

2021 ◽  
Vol 9 ◽  
Author(s):  
Brita Asikanius ◽  
Anna-Stiina Jääskeläinen ◽  
Hanna Koivula ◽  
Petri Oinonen ◽  
Monika Österberg
Keyword(s):  
Materials Science ◽  
Composite Films ◽  
Pulp Mill ◽  
Industrial Applications ◽  
Hydroxyethyl Cellulose ◽  
Free Standing ◽  
Fractionation Process ◽  
Breaking Strain ◽  
Side Stream ◽  
Biomass Fractionation

Valorization of side streams offers novel types of raw materials to complement or replace synthetic and food-based alternatives in materials science, increasing profitability and decreasing the environmental impacts of biorefineries. Lignocellulose biomass contains lignin and carbohydrates that are covalently linked into lignin-carbohydrate complexes (LCCs). In biomass fractionation processes, these complexes are conventionally considered as waste, which hinders the biomass fractionation process, and they may solubilize into aqueous effluents. This study presents how LCCs, derived from pulp mill effluent, can be turned into valuable biopolymers for industrial polymer film applications. Free-standing composite films containing hydroxyethyl cellulose (HEC) and LCCs with varying molar mass, charge density and lignin/hemicellulose ratio were prepared to study the effect of LCC amount on mechanical properties and oxygen permeability. Increasing the LCC content increased the yield point and Young’s modulus of the films. Breaking strain measurements revealed a non-linear correlation with the LCC concentration for the samples with higher lignin than hemicellulose content. The addition of LCC enhanced oxygen barrier properties of HEC films significantly even at high relative humidity. The present research demonstrates how a currently underutilized fraction of the biorefinery side stream has the potential to be valorized as a biopolymer in industrial applications, for example as a barrier film for paper and board packaging.

Plasmon enhanced magneto-optical effect on surface of pure gold film

2012 ◽  
Vol 20 (7) ◽  
pp. 1525-1531
Author(s):  
熊尚 XIONG Shang ◽  
罗雪丰 LUO Xue-feng ◽  
韩立 HAN Li
Keyword(s):  
Gold Film ◽  
Pure Gold ◽  
Optical Effect ◽  
Magneto Optical Effect

Bulge Test Characterization of Static Softening and Dynamic Instabilities in Foils of an Al-Based Alloy

2001 ◽  
Vol 695 ◽  
Author(s):  
Miroslav Cieslar ◽  
Ayatollah Karimi ◽  
Jean-Luc Martin
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Cell Structure ◽  
Rate Sensitivity ◽  
Bulge Test ◽  
Large Strains ◽  
Subgrain Structure ◽  
Free Standing ◽  
Strain Behavior ◽  
Bulge Testing

ABSTRACTEffects of recovery and recrystallization on subsequent stress – strain behavior were studied in foils of non-age hardenable Al based alloy. A bulge testing device for mechanical testing of thin free standing films and foils, enabling the detection of large strains, was employed. The bulge tester was used at RT both for the predeformation of the foil in the biaxial mode and also for the study of softening after subsequent one-step annealing. Three stages of strength drop as a function of the annealing temperature were observed between RT and 590°C. The contribution of different annealing processes to the softening was established using transmission electron microscopy. It was found that below 200°C only redistribution of dislocations inside dislocation cells and refinement of the cell structure occurred. Between 200°C and 380°C the formation of a subgrain structure was observed. The softening process is terminated as partial recrystallization takes place at higher annealing temperatures. Dynamic interaction of solutes with dislocations was revealed during prestraining as well as poststraining of foils. This effect resulted in the appearance of a negative strain rate sensitivity and dynamic instabilities after appropriate prestraining and annealing conditions. The above results show that bulge testing of Al foils allows to study the successive annealing stages by measuring the most important macroscopic parameters of plastic deformation (yield stress, work hardening rate, ductility, strain rate sensitivity, etc.). These stages could be related to the microstructure evolution.

scholarly journals Photosensitive free-standing ultra-thin carbyne–gold films

2019 ◽  
Vol 51 (12) ◽  
Author(s):  
Vlad Samyshkin ◽  
Anastasia Lelekova ◽  
Anton Osipov ◽  
Dmitrii Bukharov ◽  
Igor Skryabin ◽  
...  
Keyword(s):  
Gold Films ◽  
Free Standing

scholarly journals Effect of Cellulose Nanofibrils and TEMPO-mediated Oxidized Cellulose Nanofibrils on the Physical and Mechanical Properties of Poly(vinylidene fluoride)/Cellulose Nanofibril Composites

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1091 ◽  
Author(s):  
Eftihia Barnes ◽  
Jennifer A. Jefcoat ◽  
Erik M. Alberts ◽  
Mason A. McKechnie ◽  
Hannah R. Peel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vinylidene Fluoride ◽  
Cellulose Nanofibrils ◽  
Composite Films ◽  
Weight Ratio ◽  
Tensile Modulus ◽  
Physical And Mechanical Properties ◽  
Free Standing ◽  
Composite Surface ◽  
Poly Vinylidene Fluoride

Cellulose nanofibrils (CNFs) are high aspect ratio, natural nanomaterials with high mechanical strength-to-weight ratio and promising reinforcing dopants in polymer nanocomposites. In this study, we used CNFs and oxidized CNFs (TOCNFs), prepared by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation process, as reinforcing agents in poly(vinylidene fluoride) (PVDF). Using high-shear mixing and doctor blade casting, we prepared free-standing composite films loaded with up to 5 wt % cellulose nanofibrils. For our processing conditions, all CNF/PVDF and TOCNF/PVDF films remain in the same crystalline phase as neat PVDF. In the as-prepared composites, the addition of CNFs on average increases crystallinity, whereas TOCNFs reduces it. Further, addition of CNFs and TOCNFs influences properties such as surface wettability, as well as thermal and mechanical behaviors of the composites. When compared to neat PVDF, the thermal stability of the composites is reduced. With regards to bulk mechanical properties, addition of CNFs or TOCNFs, generally reduces the tensile properties of the composites. However, a small increase (~18%) in the tensile modulus was observed for the 1 wt % TOCNF/PVDF composite. Surface mechanical properties, obtained from nanoindentation, show that the composites have enhanced performance. For the 5 wt % CNF/PVDF composite, the reduced modulus and hardness increased by ~52% and ~22%, whereas for the 3 wt % TOCNF/PVDF sample, the increase was ~23% and ~25% respectively.

Design and characterization of chitosan/zeolite composite films — Effect of zeolite type and zeolite dose on the film properties

2016 ◽  
Vol 60 ◽  
pp. 246-254 ◽  
Author(s):  
Gustavo P. Barbosa ◽  
Henrique S. Debone ◽  
Patrícia Severino ◽  
Eliana B. Souto ◽  
Classius F. da Silva
Keyword(s):  
Composite Films ◽  
Film Properties ◽  
Zeolite Type ◽  
Zeolite Composite
Sign in / Sign up

Export Citation Format

Share Document