scholarly journals Molecular force transfer mechanisms in graphene oxide paper evaluated using atomic force microscopy and in situ synchrotron micro FT-IR spectroscopy

Nanoscale ◽  
2014 ◽  
Vol 6 (23) ◽  
pp. 14404-14411 ◽  
Author(s):  
Congwei Wang ◽  
Mark D. Frogley ◽  
Gianfelice Cinque ◽  
Lu-Qi Liu ◽  
Asa H. Barber
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Force Microscopy ◽  
Atomic Force ◽  
Molecular Force ◽  
Force Transfer ◽  
Ft Ir ◽  
Graphene Oxide Paper ◽  
Ft Ir Spectroscopy

The mechanical properties of graphene oxide (GO) paper are critically defined both by the mechanical properties of the constituent GO sheets and the interaction between these sheets.

GROWTH AND STUDIES OF PROPERTIES OF COPPER SUCCINATE DIHYDRATE SINGLE CRYSTALS

2013 ◽  
Vol 27 (11) ◽  
pp. 1350073
Author(s):  
M. P. BINITHA ◽  
P. P. PRADYUMNAN
Keyword(s):  
Differential Scanning Calorimetry ◽  
Dielectric Constant ◽  
Single Crystals ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Different Temperatures ◽  
Triclinic Structure ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Single crystals of copper succinate dihydrate (CSD) with triclinic structure were grown in silica gel medium. The functional groups in the crystal were analyzed by FT-IR Spectroscopy. Atomic Force Microscopy (AFM) revealed the striations on the surface of grown crystals, which were incorporated during its time of growth. Thermal degradation studies have been carried out by Differential Scanning Calorimetry (DSC). Dielectric constant and AC conductivity have been estimated as a function of frequency at different temperatures.

Effect of Glass Composition on Mechanical Properties of Interfaces Between Alumina and Silicate Glass

1996 ◽  
Vol 458 ◽  
Author(s):  
Andrey V. Zagrebelny ◽  
Erica T. Lilleodden ◽  
C. Barry Carter
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Silicate Glass ◽  
Glass Composition ◽  
Depth Sensing ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging ◽  
Force Displacement

ABSTRACTInterfaces between glass and crystalline grains have been examined using a thin-film geometry which allows the use of newly developed experimental methods for micromechanical testing of interfaces. In this approach, continuous films of thicknesses ranging 100–200 nm of anorthite (CaAl2Si2O8), celsian (BaAl2Si2O8), and monticellite (CaMgSiO4) are deposited onto single-crystal Al2O3 (α-structure) surfaces of different crystallographic orientations by pulsed-laser deposition (PLD).Mechanical properties such as hardness, stiffness, and reduced Young's modulus were probed with a newly developed high-resolution depth-sensing indentation instrument. Emphasis has been placed on examining how changes in the glass composition will affect the mechanical properties of the single-crystal Al2O3/silicate-glass interfaces. The indentation data obtained from these experiments correlate directly to the morphology of the deformed regions imaged with atomic force microscopy (AFM). Nanomechanical tests combined with AFM imaging of the deformed regions allow force-displacement measurements and in-situ imaging of the same regions of the specimen before and immediately after indentation. This new technique eliminates the uncertainty of locating the indenter after unloading.

Combined AFM-SEM testing for mechanical property determination of graphene oxide paper

2012 ◽  
Vol 1407 ◽  
Author(s):  
Congwei Wang ◽  
Asa H. Barber
Keyword(s):  
Graphene Oxide ◽  
Ion Beam ◽  
Force Microscopy ◽  
Atomic Force ◽  
Focussed Ion Beam ◽  
Graphene Oxide Paper ◽  
Sample Width ◽  
Testing Condition ◽  
Vacuum Testing

ABSTRACTA novel technique combining both atomic force microscopy (AFM) and scanning electron microscopy (SEM) is used to test the mechanical properties of densely-packed graphene oxide (GO) paper. Individual beams of GO paper with variable widths were prepared using focussed ion beam (FIB) microscopy and tensile tested to failure using the AFM while observing with SEM. A variation in the tensile strength of the GO paper beams up to 64.8 MPa was recorded in the vacuum testing condition. An increase in breaking stress of GO paper with decreasing sample width was determined and proposed as being due to fewer defects present in GO beams of smaller width.

scholarly journals A Turn-On Fluorescent Sensor for Hg2+ Based on Graphene Oxide

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Yong Wu He ◽  
Yi Feng ◽  
Lian Wei Kang ◽  
Xiao Liang Li
Keyword(s):  
Heavy Metal ◽  
Atomic Force Microscopy ◽  
Graphene Oxide ◽  
Heavy Metal Ions ◽  
Charge Transfer Complex ◽  
Fluorescent Sensor ◽  
Force Microscopy ◽  
Turn On ◽  
Atomic Force ◽  
Ft Ir

A graphene oxide- (GO-) boradiazaindacenes (BODIPY) charge-transfer complex (BGO) has been easily synthesized, and the structure of BGO was confirmed by FT-IR and atomic force microscopy (AFM). Moreover, the BGO was found that could be used as a turn-on fluorescent sensor for Hg2+. Upon addition of Hg2+, the fluorescence of BGO would be enhanced since the energy transfer between BODIPY and GO was inhibited. The selectivity and the competition performance of BGO towards Hg2+ were good among other heavy metal ions.

scholarly journals Evidence of Carboxyl Modification of Hydrogen-Free Diamond-Like Carbon Films Assisted by Radio Frequency Plasma in Vacuum

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Yuqi Xue ◽  
Zixin Wang ◽  
Jun Wang ◽  
Changji Hu ◽  
Fangyan Xie ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Carbon Films ◽  
Rf Plasma ◽  
Diamond Like Carbon ◽  
Spectra Analysis ◽  
Force Microscopy ◽  
Atomic Force ◽  
Frequency Plasma ◽  
Ft Ir

Modification of hydrogen-free diamond-like carbon (DLC) is presented, with acrylic acid (AA) vapor carried into a vacuum chamber by argon and with the in situ assistance of low-power radio frequency (RF) plasma at a temperature below 100°C. Measured by atomic force microscopy (AFM) technique, the roughness (Ra) of the DLC was 1.063±0.040 nm. XPS and FT-IR spectra analysis showed that carboxyl groups were immobilized on the surface of the DLC films, with about 40% of carboxyl group area coverage. It was found that the RF plasma and reaction time are important in enhancing the modification rate and efficiency.

scholarly journals Characterization of the Spindle Morphology Nanomicelles Assembled from Sericin and Gelatin

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Xiaozhou Su ◽  
Lei Li ◽  
Weihan Huang
Keyword(s):  
Electron Microscopy ◽  
Protein Concentration ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Storage ◽  
Ft Ir Spectroscopy

Complex nanomicelles were prepared by sericin and type A gelatin with molecular weight of 5789 Da and 128664 Da separately. The assembling conditions were as follows: mass ratio (sericin/gelatin) was 1 : 1, protein concentration was 0.5%, temperature was 35°C, and assembling time was 18 hours. Scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and dynamic light scattering (DLS) were conducted to observe and characterize the complex nanomicelles. Results showed that the complex sericin/gelatin micelles was a kind of nanospindle micelles. The micelles had high electrochemical stability, thermal stability, antidilution stability, and storage stability.

Experimental investigations into the mechanical properties of the collagen fibril-noncollagenous protein (NCP) interface in antler bone

2010 ◽  
Vol 1274 ◽  
Author(s):  
Fei Hang ◽  
Asa H Barber
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Collagen Fibrils ◽  
Experimental Investigations ◽  
Shear Stresses ◽  
Structural Hierarchy ◽  
Force Microscopy ◽  
Atomic Force ◽  
The Individual

AbstractAntler is an extraordinary bone tissue that displays significant overall toughness when compared to other bone materials. The origin of this toughness is due to the complex interaction between the nanoscale constituents as well as structural hierarchy in the antler material. Of particular interest is the mechanical performance of the interface between the collagen fibrils and considerably smaller volume of non-collagenous protein (NCP) between these fibrils. This paper directly examines the mechanical properties of isolated volumes of antler using combined in situ atomic force microscopy (AFM)-scanning electron microscopy (SEM) experiments. The antler material at the nanoscale is approximated to a fiber reinforced composite, with composite theory used to evaluate the interfacial shear stresses generated between the individual collagen fibrils and NCP during mechanical loading.

Measuring size-dependent mechanical properties of electrospun polystyrene fibers using in-situ AFM-SEM

2012 ◽  
Vol 1424 ◽  
Author(s):  
Russell J. Bailey ◽  
Beatriz Cortes-Ballesteros ◽  
Hao Zhang ◽  
Congwei Wang ◽  
Asa H. Barber
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Fiber Diameter ◽  
Electrospun Fibers ◽  
Force Microscopy ◽  
Size Dependent ◽  
Atomic Force ◽  
Scanning Electron

ABSTRACTThe mechanical properties of individual electrospun polystyrene fibers with sub-micron diameters were measured using a combination of atomic force microscopy (AFM) and scanning electron microscopy (SEM). The strain to failure of the electrospun fibers was observed to increase as the fiber diameter decreased. This size dependent mechanical behavior in individual electrospun polystyrene fibers indicates a suppression of localized failure and a shift away from crazing that is dominant in bulk samples.

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