Design of TiO2/Au nanoparticle films with controlled crack formation and different architectures using a centrifugal strategy

Centrifugal strategy is demonstrated to enable the design of hybrid nanocomposite films with controllable architecture, porosity, crack density and thickness.

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Octahedral oligomeric silsesquioxane (OAPS and OG) - Polyimide hybrid nanocomposite films: Thermo-mechanical, dielectric and morphology properties

Journal of Macromolecular Science Part A ◽

10.1080/10601325.2019.1653197 ◽

2019 ◽

Vol 56 (12) ◽

pp. 1082-1096 ◽

Cited By ~ 1

Author(s):

Shanmugam Nagendiran ◽

Ayyavu Chandramohan ◽

Kannaiyan Dinakaran ◽

Muthukaruppan Alagar

Keyword(s):

Nanocomposite Films ◽

Hybrid Nanocomposite ◽

Oligomeric Silsesquioxane

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Novel Fabrication of Au Nanoparticle Films on Planar and Curved Surfaces of Glass and Fiber Materials

Langmuir ◽

10.1021/la9009465 ◽

2009 ◽

Vol 25 (17) ◽

pp. 9697-9702 ◽

Cited By ~ 16

Author(s):

Kwan Kim ◽

Ji Won Lee ◽

Hyang Bong Lee ◽

Kuan Soo Shin

Keyword(s):

Au Nanoparticle ◽

Curved Surfaces ◽

Nanoparticle Films ◽

Fiber Materials

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Performance of composite sandwich structures under thermal cycling

Journal of Composite Materials ◽

10.1177/0021998319862324 ◽

2019 ◽

Vol 54 (2) ◽

pp. 271-283

Author(s):

Sandesh Rathnavarma Hegde ◽

Mehdi Hojjati

Keyword(s):

Crack Formation ◽

Mechanical Performance ◽

Crack Density ◽

Free Edge ◽

Element Analysis ◽

Thermally Induced ◽

Composite Sandwich ◽

Composite Sandwich Structures ◽

Number Of Cycles ◽

Microscopic Inspection

Effect of thermally induced microcracks on mechanical performance of a space grade laminated sandwich panel is investigated. A simple non-contact setup using liquid nitrogen is developed to subject the material to low temperature of −170℃ with cooling rate of 24℃/min. Then the samples are exposed to the elevated temperature of 150℃ inside oven. Microcracks formation and propagation are monitored through microscopic observation of cross-section during the cycling. Flatwise tensile test is performed after a number of cycles. A correlation is made between number of cycles and flatwise mechanical strength after quantifying the microcracks. It is observed that the crack formation gets saturated at about 40 cycles, avoiding the need to conduct more thermal cycles. Microcrack formation both at the free edge and middle of laminate was observed. The crack density at the middle was comparatively less than the ones found on the free edges. Results for non-contact cooling are compared with samples from direct nitrogen contact cooling. Microscopic inspection and flatwise test show differences between contact and non-contact cooled samples. Flatwise tensile strength for non-contact cooled samples shows 15% reduction, while the contact cooled samples have about 30% decrease in bond strength. A 3D finite element analysis is conducted to qualitatively identify the location of stress concentration which can be possible sites of crack formation. Good agreement is observed between the model and experimental results.

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Preparation and characterization of polynorbornene/sepiolite hybrid nanocomposite films

Polymer International ◽

10.1002/pi.4759 ◽

2014 ◽

Vol 64 (1) ◽

pp. 96-104 ◽

Cited By ~ 2

Author(s):

Hun Jeong Cho ◽

Shinkyu Park ◽

Chang-Sik Ha

Keyword(s):

Nanocomposite Films ◽

Hybrid Nanocomposite

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Microstructure and Optical Properties of Au–Y2O3-stabilized ZrO2 Nanocomposite Films

Journal of Materials Research ◽

10.1557/jmr.2005.0300 ◽

2005 ◽

Vol 20 (9) ◽

pp. 2516-2522 ◽

Cited By ~ 3

Author(s):

George Sirinakis ◽

Rezina Siddique ◽

Christos Monokroussos ◽

Michael A. Carpenter ◽

Alain E. Kaloyeros

Keyword(s):

Optical Properties ◽

Au Nanoparticles ◽

Annealing Temperature ◽

Rutherford Backscattering Spectrometry ◽

Nanocomposite Films ◽

Au Nanoparticle ◽

X Ray Diffraction ◽

Working Pressure ◽

Optical Absorption Band ◽

Size Dependent

Nanocomposite films consisting of gold nanoparticles embedded in an yttria stabilized zirconia (YSZ) matrix were synthesized at room temperature by radio-frequency co-sputtering from YSZ and Au targets at a 5 mTorr working pressure. The films were subsequently annealed for 2 h in 1 atm argon, with the annealing temperature varied from 600 to 1000 °C in steps of 100 °C. The composition, microstructure, and optical properties of the films were characterized as a function of annealing temperature by Rutherford backscattering spectrometry, scanning electron microscopy, Auger electron spectroscopy, x-ray diffraction, and absorption spectroscopy. An optical absorption band due to the surface plasmon resonance (SPR) of the Au nanoparticles was observed around a wavelength of 600 nm. Furthermore, the SPR band full width at half-maximum exhibited an inverse linear dependence on the radius of the Au nanoparticle, with a slope parameter A = 0.18, indicating a weak interaction between the YSZ matrix and the Au nanoparticles. The experimentally observed SPR dependence on nanoparticle size is discussed within the context of the Mie theory and its size-dependent optical constants.

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