scholarly journals A Three-Dimensional Porous Conducting Polymer Composite with Ultralow Density and Highly Sensitive Pressure Sensing Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Jin-Dong Su ◽  
Xian-Sheng Jia ◽  
Jin-Tao Li ◽  
Tao Lou ◽  
Xu Yan ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
In Situ Polymerization ◽  
Three Dimensional ◽  
Aniline Monomer ◽  
Pressure Sensing ◽  
Sensing Properties ◽  
Before And After ◽  
Different Temperatures ◽  
Voltage Current Characteristic

An ultralight conducting polyaniline/SiC/polyacrylonitrile (PANI/SiC/PAN) composite was fabricated by in situ polymerization of aniline monomer on the surface of fibers in SiC/PAN aerogel. The SiC/PAN aerogel was obtained by electrospinning, freeze-drying, and heat treatment. The ingredient, morphology, structure, and electrical properties of the aerogel before and after in situ polymerization were investigated by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and voltage-current characteristic measurement. The thermostability of PANI/SiC/PAN composite was investigated by thermogravimetric analysis (TGA) and electrical resistance measured at different temperatures. The density of the PANI/SiC/PAN composite was approximately 0.211 g cm−3, the porosity was 76.44%, and the conductivity was 0.013 S m−1. The pressure sensing properties were evaluated at room temperature. The electrical resistance of as-prepared sample decreased gradually with the increase of pressure. Furthermore, the pressure sensing process was reversible and the response time was short (about 1 s). This composite may have application in pressure sensor field.

scholarly journals In Situ Coherent X-ray Diffraction during Three-Point Bending of a Au Nanowire: Visualization and Quantification

2018 ◽  
Vol 2 (4) ◽  
pp. 24 ◽  
Author(s):  
Anton Davydok ◽  
Thomas Cornelius ◽  
Zhe Ren ◽  
Cedric Leclere ◽  
Gilbert Chahine ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Reciprocal Space ◽  
X Ray Diffraction ◽  
Complex Deformation ◽  
X Ray ◽  
Three Point Bending ◽  
Atomic Force ◽  
Au Nanowire ◽  
Before And After

The three-point bending behavior of a single Au nanowire deformed by an atomic force microscope was monitored by coherent X-ray diffraction using a sub-micrometer sized hard X-ray beam. Three-dimensional reciprocal-space maps were recorded before and after deformation by standard rocking curves and were measured by scanning the energy of the incident X-ray beam during deformation at different loading stages. The mechanical behavior of the nanowire was visualized in reciprocal space and a complex deformation mechanism is described. In addition to the expected bending of the nanowire, torsion was detected. Bending and torsion angles were quantified from the high-resolution diffraction data.

Preparation of ZnO/PANI Nanocomposite and Study on its Photocatalytic Properties

2013 ◽  
Vol 716 ◽  
pp. 368-372
Author(s):  
Hui Xu ◽  
Jian Wei Xing
Keyword(s):  
Charge Separation ◽  
In Situ Polymerization ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Aniline Monomer ◽  
First Order ◽  
Photocatalytic Activities ◽  
Recombination Centers ◽  
Kinetics Of

Polyaniline (PANI)/zinc oxide (ZnO) nanocomposites have been synthesized by in-situ polymerization of aniline monomer with ZnO nanomaterials. The PANI/ZnO nanocomposites were used as photocatalyst in the photodegradation of methylene blue dye (MB) molecules in aqueous solution. The results showed that PANI/ZnO nanocomposite greatly enhanced photocatalytic activities compared with pristine polyaniline might due to high photoexcited electronhole pairs charge separation. The photocatalytic activities of PANI/ZnO nanocomposites increased with increasing ZnO content, however, further increasing ZnO content over 50% induced the formation of more agglomerates, which could act as recombination centers of photoexcited electronhole pairs, leading to decreased photocatalytic activity. The kinetics of photodegradation of MB dye using PANI/ZnO(ZnO content 50 % ) nanocomposites photocatalyst was found to be of the first order.

scholarly journals Model Smoke Stream Adsorption over Cellulose Acetate Stick with Three-dimensional Temperature Gradient by Combining in-situ DRIFTS with Infrared Thermal Imaging

2021 ◽  
Author(s):  
Xin Xu ◽  
Xi Du ◽  
Feng Zheng ◽  
Lisheng Guo ◽  
Panwei Shi ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Cellulose Acetate ◽  
Human Health ◽  
Thermal Imaging ◽  
Three Dimensional ◽  
Adsorption Properties ◽  
Mathematical Explanation ◽  
Infrared Thermal Imaging ◽  
Different Temperatures

Abstract Understanding the adsorption of the smoke stream (SR) on cellulose acetate stick as cigarette filter with different temperatures is beneficial for controlling chemical emissions and reducing the toxic effect of smoking on human health. However the investigation of corresponding adsorption properties was missing because the adsorption of smoke stream (SR) on cigarette cellulose acetate stick is sensitive with the three-dimensional temperature gradient. In this work, the adsorption of typical smoke stream substances, such as CO, propylene glycol, formaldehyde, and acetone, on cellulose acetate stick were studied by in-situ diffuse reflectance Fourier transform infrared spectroscopy with different temperatures assisted by the infrared thermal imaging method. The adsorption capacities of cellulose acetate stick to these typical smoke stream substances is dependent on the adsorption time and temperature. The adsorption properties all fitted well with the Freundlich model. By a spectroscopic and mathematical explanation, quantifying contours of adsorption was performed. The 3D model of the normalized CO adsorption of cellulose acetate stick versus the spatial coordinates and time was established. This study gives unparalleled insight into smoking release characteristics of tobacco filtered by cellulose acetate and regulating cellulose acetate stick for reducing the negative effect of smoke on human health.

Up-Conversion Nanoparticles/PMMA Composites for Light-Emitting Applications

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050023
Author(s):  
Yongling Zhang ◽  
Peng Lv ◽  
Xiang Liu ◽  
Haoyuan Chi ◽  
Guoqing Xi ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Fluorescence Spectra ◽  
In Situ Polymerization ◽  
Three Dimensional ◽  
Luminescence Spectra ◽  
3D Display ◽  
Light Emitting ◽  
Bulk Polymers ◽  
Doping Ratio

In this paper, we prepared KMnF3:Yb[Formula: see text], Er[Formula: see text] nanoparticles (NPs)/polymethyl methacrylate (PMMA) composites, NaYF4:Yb[Formula: see text], Tm[Formula: see text]NPs/PMMA composites and NaYF4Yb[Formula: see text], Er[Formula: see text]NPs/PMMA composites by in situ polymerization, and these NPs/PMMA composites can emit red, blue and green up-conversion fluorescence excited by 980[Formula: see text]nm, respectively. The mixed white NPs/PMMA composites were obtained by adjusting the doping ratio of the above three NPs. These NPs/PMMA composites are transparent. We tested the up-conversion fluorescence spectra of all the NPs and NPs/PMMA composites, under 980[Formula: see text]nm excitation. The up-conversion luminescence spectra of the NPs and NPs/PMMA composites are consistent, which further indicates that the in situ polymerization has not changed the chemical structure of the NPs. Then, we prepared transparent bulk polymers by curing these NPs/PMMA composites. Under 980[Formula: see text]nm laser excitation, these NPs/PMMA bulk polymers can emit red, blue, green and white up-conversion emissions, respectively. The results indicate that the NPs/PMMA composites can be applied to three-dimensional (3D) display.

Self-assembling Peptide Scaffolds Promote Enamel Remineralization

2007 ◽  
Vol 86 (5) ◽  
pp. 426-430 ◽  
Author(s):  
J. Kirkham ◽  
A. Firth ◽  
D. Vernals ◽  
N. Boden ◽  
C. Robinson ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
De Novo ◽  
In Situ Polymerization ◽  
Three Dimensional ◽  
Dental Enamel ◽  
Dental Tissue ◽  
Skeletal Tissue ◽  
Low Viscosity ◽  
Self Assembling

Rationally designed β-sheet-forming peptides that spontaneously form three-dimensional fibrillar scaffolds in response to specific environmental triggers may potentially be used in skeletal tissue engineering, including the treatment/prevention of dental caries, via bioactive surface groups. We hypothesized that infiltration of caries lesions with monomeric low-viscosity peptide solutions would be followed by in situ polymerization triggered by conditions of pH and ionic strength, providing a biomimetic scaffold capable of hydroxyapatite nucleation, promoting repair. Our aim was to determine the effect of an anionic peptide applied to caries-like lesions in human dental enamel under simulated intra-oral conditions of pH cycling. Peptide treatment significantly increased net mineral gain by the lesions, due to both increased remineralization and inhibition of demineralization over a five-day period. The assembled peptide was also capable of inducing hydroxyapatite nucleation de novo. The results suggest that self-assembling peptides may be useful in the modulation of mineral behavior during in situ dental tissue engineering.

scholarly journals Facile Preparation, Characterization, and Highly Effective Microwave Absorption Performance of CNTs/Fe3O4/PANI Nanocomposites

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Deqing Zhang ◽  
Xiuying Yang ◽  
Junye Cheng ◽  
Mingming Lu ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
In Situ Polymerization ◽  
Weight Ratio ◽  
Peak Frequency ◽  
Aniline Monomer ◽  
Transmission Electron ◽  
Absorption Performance ◽  
Additional Process ◽  
5 Ghz

A facile method has been developed to synthesize light-weight CNTs/Fe3O4/PANI nanocomposites. The formation route was proposed as the coprecipitation of Fe2+and Fe3+and an additional process of in situ polymerization of aniline monomer. The structure and morphology of CNTs/Fe3O4/PANI were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. The TEM investigation shows that the CNTs/Fe3O4/PANI nanocomposites exhibit less intertwined structure and that many more Fe3O4particles are attached homogeneously on the surface of CNTs, indicating that PANI can indeed help CNTs to disperse in isolated form. The wave-absorbing properties were investigated in a frequency of 2–18 GHz. The results show that the CNTs/Fe3O4/PANI nanocomposites exhibit a super absorbing behavior and possess a maximum reflection loss of −48 dB at 12.9 GHz, and the bandwidth below −20 dB is more than 5 GHz. More importantly, the absorption peak frequency ranges of the CNTs/Fe3O4/PANI composites can be tuned easily by changing the wax weight ratio and thickness of CNTs/Fe3O4/PANI paraffin wax matrix.

Preparation, characterization, and properties of graphene-based composite aerogels via in situ polymerization and three-dimensional self-assembly from graphene oxide solution

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78538-78547 ◽  
Author(s):  
Haiming Cheng ◽  
Huafei Xue ◽  
Guangdong Zhao ◽  
Changqing Hong ◽  
Xinghong Zhang
Keyword(s):  
Graphene Oxide ◽  
Phase Separation ◽  
Self Assembly ◽  
In Situ Polymerization ◽  
Three Dimensional ◽  
One Pot ◽  
Hierarchical Porous ◽  
Composite Aerogels ◽  
Polymerization Induced Phase Separation

In this work, hierarchical porous graphene-based composite aerogels are synthesized by a simple and facile one-pot polymerization-induced phase separation.

Preparation and properties of three dimensional graphene/phenolic resin composites via in-situ polymerization in graphene hydrogels

2018 ◽  
Vol 447 ◽  
pp. 837-844 ◽  
Author(s):  
Guoping Yang ◽  
Yanhui Wang ◽  
Hanqing Xu ◽  
Shuyu Zhou ◽  
Shaopei Jia ◽  
...  
Keyword(s):  
Phenolic Resin ◽  
In Situ Polymerization ◽  
Three Dimensional ◽  
Resin Composites

Synthesis, Characterization and Corrosion Protection Properties of Polyaniline/TiO2 Nanocomposite

2011 ◽  
Vol 399-401 ◽  
pp. 2083-2086
Author(s):  
Lian Zhong ◽  
Yan Hua Wang ◽  
Yong Hong Lu
Keyword(s):  
Strong Interaction ◽  
In Situ Polymerization ◽  
Polymer Nanocomposite ◽  
Aniline Monomer ◽  
Nano Tio2 ◽  
Conductive Polyaniline ◽  
Anticorrosion Performance ◽  
Protective Performance ◽  
Epoxy Paint

In this study, conductive polyaniline (PANi)–titania (TiO2) nanocomposites with core–shell structure were prepared and their anticorrosion properties were investigated. PANi/nano-TiO2 composite were prepared by in situ polymerization of aniline monomer in the presence of TiO2 nanoparticles. The morphology and structure of the polymer nanocomposite was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), respectively. SEM and FTIR spectra measurements show that PANi and TiO2 nanoparticles are not simply blended or mixed up, and a strong interaction exists at the interface of nano-TiO2 and PANi. From the anticorrosion investigation in 3.5%NaCl, it is revealed that the protective performance of epoxy paint containing PANi/nano-TiO2 composite is significantly improved than PANi or a mixture of polyaniline and nano-TiO2. From the improved anticorrosion performance, it also indicate that PANi and TiO2 nanoparticles are not simply blended or mixed up, the strong interaction exists at the interface of PANi and nano-TiO2. It is the strong interaction that results in the coordinated effect and more excellent anticorrosion performance.

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