Mechanochemical Activation of Fluorogenic CuAAC “Click” Reactions for Stress-Sensing Applications

2018 ◽  
Vol 39 (22) ◽  
pp. 1800376 ◽  
Author(s):  
Philipp Michael ◽  
Michel Biewend ◽  
Wolfgang H. Binder
Keyword(s):  
Mechanochemical Activation ◽  
Click Reactions ◽  
Sensing Applications ◽  
Stress Sensing

Detection of stress in polymers: mechanochemical activation of CuAAC click reactions in poly(urethane) networks

Soft Matter ◽  
2020 ◽  
Vol 16 (5) ◽  
pp. 1137-1141 ◽  
Author(s):  
Michel Biewend ◽  
Philipp Michael ◽  
Wolfgang H. Binder
Keyword(s):  
Mechanochemical Activation ◽  
Click Reactions ◽  
Detection Of Stress ◽  
Stress Sensing ◽  
Quantitative Stress

We report on copper(i)-bis(N-heterocyclic carbene)s (NHC) for quantitative stress-sensing. This mechanophore is embedded within a polyurethane network, triggering a fluorogenic copper(i) azide alkyne cycloaddition (CuAAC) of 8-azido-2-naphtol and 3-hydroxy phenylacetylene.

Processing of Laminated Barium Titanate Structures for Stress-Sensing Applications

1995 ◽  
Vol 78 (9) ◽  
pp. 2476-2480 ◽  
Author(s):  
Joseph S. Capurso ◽  
Aldo B. Alles ◽  
Walter A. Schulze
Keyword(s):  
Barium Titanate ◽  
Sensing Applications ◽  
Stress Sensing

Mechanochemical Synthesis of Novel Sensor Materials

2009 ◽  
Vol 1226 ◽  
Author(s):  
Monica Sorescu ◽  
Lucian Diamandescu ◽  
Adelina Tomescu
Keyword(s):  
Ball Milling ◽  
Milling Time ◽  
Gas Sensing ◽  
Mechanochemical Activation ◽  
Magnetic Characteristics ◽  
X Ray Diffraction ◽  
Recoilless Fraction ◽  
X Ray ◽  
Immiscible System ◽  
Sensing Applications

AbstractThe xZnO-(1-x)alpha-Fe2O3 and xZrO2-(1-x)alpha-Fe2O3 nanoparticles systems have been obtained by mechanochemical activation for x=0.1, 0.3 and 0.5 and for ball milling times ranging from 2 to 24 hours. Structural and magnetic characteristics of the zinc and zirconium-doped hematite systems were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy and conductivity measurements. Using the dual absorber method, the recoilless fraction was derived as function of ball milling time for each value of the molar concentration involved. As ZnO is not soluble in hematite in the bulk form, the present study clearly illustrates that the solubility limits of an immiscible system can be extended beyond the limits in the solid state by mechanochemical activation. Moreover, this synthetic route allowed us to reach nanometric particle dimensions, which makes these materials very important for gas sensing applications.

scholarly journals Assessing the Influence of the Sourcing Voltage on Polyaniline Composites for Stress Sensing Applications

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1164 ◽  
Author(s):  
Andrés Felipe Cruz-Pacheco ◽  
Leonel Paredes-Madrid ◽  
Jahir Orozco ◽  
Jairo Alberto Gómez-Cuaspud ◽  
Carlos R. Batista-Rodríguez ◽  
...  
Keyword(s):  
Operating Voltage ◽  
Mechanical Mixing ◽  
Sensing Applications ◽  
Error Metrics ◽  
Strain Stress ◽  
Stress Sensing ◽  
Polyaniline Composites ◽  
Ultra High Molecular Weight ◽  
Effective Distribution

Polyaniline (PANI) has recently gained great attention due to its outstanding electrical properties and ease of processability; these characteristics make it ideal for the manufacturing of polymer blends. In this study, the processing and piezoresistive characterization of polymer composites resulting from the blend of PANI with ultra-high molecular weight polyethylene (UHMWPE) in different weight percentages (wt %) is reported. The PANI/UHMWPE composites were uniformly homogenized by mechanical mixing and the pellets were manufactured by compression molding. A total of four pellets were manufactured, with PANI percentages of 20, 25, 30 and 35 wt %. Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to confirm the effective distribution of PANI and UHMWPE particles in the pellets. A piezoresistive characterization was performed on the basis of compressive forces at different voltages; it was found that the error metrics of hysteresis and drift were influenced by the operating voltage. In general, larger voltages lowered the error metrics, but a reduction in sensor sensitivity came along with voltage increments. In an attempt to explain such a phenomenon, the authors developed a microscopic model for the piezoresistive response of PANI composites, aiming towards a broader usage of PANI composites in strain/stress sensing applications as an alternative to carbonaceous materials.

Pseudo-Hall Effect in Single Crystal n-Type 3C-SiC(100) Thin Film

2017 ◽  
Vol 733 ◽  
pp. 3-7 ◽  
Author(s):  
Afzaal Qamar ◽  
Dzung Viet Dao ◽  
Ji Sheng Han ◽  
Alan Iacopi ◽  
Toan Dinh ◽  
...  
Keyword(s):  
Single Crystal ◽  
Hall Effect ◽  
Electrical Response ◽  
Tensile Stresses ◽  
Offset Voltage ◽  
Sensing Applications ◽  
Beam Method ◽  
First Results ◽  
Stress Sensing ◽  
Induced Changes

This article reports the first results on stress induced pseudo-Hall effect in single crystal n-type 3C-SiC(100) grown by LPCVD process. After the growth process, Hall devices were fabricated by standard photolithography and dry etching processes. The bending beam method was employed to study the stress induced changes in the electrical response of the fabricated Hall devices. It has been observed that when stress is applied to the 3C-SiC(100) Hall devices, the offset voltage of the Hall devices varies linearly with the applied compressive and tensile stresses which is called, the pseudo-Hall effect. The variation of the offset voltage of these Hall devices is also proportional to the applied input current. This variation of the offset voltage with the applied compressive and tensile stresses shows that single crystal n-type 3C-SiC(100) can be used for stress sensing applications.

scholarly journals A large pseudo-Hall effect in n-type 3C-SiC(1 0 0) and its dependence on crystallographic orientation for stress sensing applications

2018 ◽  
Vol 213 ◽  
pp. 11-14 ◽  
Author(s):  
Afzaal Qamar ◽  
Toan Dinh ◽  
Mohsen Jafari ◽  
Alan Iacopi ◽  
Sima Dimitrijev ◽  
...  
Keyword(s):  
Hall Effect ◽  
Crystallographic Orientation ◽  
Sensing Applications ◽  
Stress Sensing

Application of Aligned Carbon Nanotubes in Micro Shear Stress Sensing

2004 ◽  
Author(s):  
Jason Clendenin ◽  
Husein Rokadia ◽  
Steve Tung ◽  
Konye Ogburia
Keyword(s):  
Shear Stress ◽  
Internal Flow ◽  
Surface Shear Stress ◽  
Sensing Element ◽  
Surface Shear ◽  
Stress Sensor ◽  
Sensing Applications ◽  
Shear Stress Sensor ◽  
Measured Resistance ◽  
Stress Sensing

This paper reports the development of a MEMS based aligned carbon nanotube, thermal surface shear stress sensor for micro shear stress sensing applications. This paper is focused on the theory of alignment of CNTs during sensing element fabrication as well as experimental and calibration results from sensor testing. It is found that CNTs can be routinely aligned between surface micromachined gold electrodes using AC dielectrophoresis to form shear stress sensing elements. In order to fabricate the sensing element, a 25 Vp-p electric field at 3 MHz was used to form a ~150 μm wide line of aligned CNTs. The measured resistance of the sensing element was 580 Ω. The fabricated CNT shear stress sensor has been tested by bonding a Plexiglas channel to the electrode chip in order to create a 2D internal flow. The CNT shear stress sensor was found to have an average TCR of −0.0112%/°C or −0.0691Ω/°C and a current to voltage ratio of 0.07 mA/V.

scholarly journals Anti‐Stokes Stress Sensing: Mechanochemical Activation of Triplet–Triplet Annihilation Photon Upconversion

2019 ◽  
Vol 58 (37) ◽  
pp. 12919-12923 ◽  
Author(s):  
Deniz Yildiz ◽  
Christoph Baumann ◽  
Annabel Mikosch ◽  
Alexander J. C. Kuehne ◽  
Andreas Herrmann ◽  
...  
Keyword(s):  
Mechanochemical Activation ◽  
Stress Sensing ◽  
Anti Stokes ◽  
Annihilation Photon ◽  
Triplet Triplet Annihilation

The temperature effect on the magneto-mechanical response of magnetostrictive composites for stress sensing applications

2017 ◽  
Vol 10 (05) ◽  
pp. 1750060 ◽  
Author(s):  
Alexander Yoffe ◽  
Hadas Kaniel ◽  
Doron Shilo
Keyword(s):  
Magnetic Field ◽  
Glass Transition ◽  
Mechanical Response ◽  
Sensing Applications ◽  
Measurement Results ◽  
Different Temperatures ◽  
Temperature Ranges ◽  
Field Sensor ◽  
Stress Sensing ◽  
Magnetostrictive Composites

Stress induced magnetic field changes in epoxy-based Terfenol-D composite materials offer a unique way for stress sensing by using a remote magnetic field sensor. In this paper, we report simultaneous measurements of the stress, strain and emitted magnetic field during compressive tests performed at different temperatures in the range of [Formula: see text]C–65[Formula: see text]C. The observed results are explained based on the physical processes that occur at different stresses and temperature ranges. Measurement results reveal a temperature range ([Formula: see text]C–45[Formula: see text]C) suitable for stress sensing applications, at which the reverse magnetostrictive response is almost temperature insensitive. At 65[Formula: see text]C, the epoxy demonstrated a significant softening due to the glass transition, indicating that a high glass transition temperature is an important desired property for the epoxy matrix.

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