Spontaneous Oxidation and in-situ Polymerization of Pyrrole in Channels of the Three-Dimensional Coordination Polymer[(Me3Sn)3FeIII(CN)6]∞

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.

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

NANO ◽

10.1142/s179329202050023x ◽

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.

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Self-assembling Peptide Scaffolds Promote Enamel Remineralization

Journal of Dental Research ◽

10.1177/154405910708600507 ◽

2007 ◽

Vol 86 (5) ◽

pp. 426-430 ◽

Cited By ~ 177

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.

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

RSC Advances ◽

10.1039/c6ra08823f ◽

2016 ◽

Vol 6 (82) ◽

pp. 78538-78547 ◽

Cited By ~ 7

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.

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

Applied Surface Science ◽

10.1016/j.apsusc.2018.04.065 ◽

2018 ◽

Vol 447 ◽

pp. 837-844 ◽

Cited By ~ 11

Author(s):

Guoping Yang ◽

Yanhui Wang ◽

Hanqing Xu ◽

Shuyu Zhou ◽

Shaopei Jia ◽

...

Keyword(s):

Phenolic Resin ◽

In Situ Polymerization ◽

Three Dimensional ◽

Resin Composites

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An unusual coordination polymer containing Cu+ions and featuring possible Cu...Cu `cuprophilic' interactions: poly[di-μ-chlorido-(μ4-3,5-diaminobenzoato-κ4O:O′:N:N′)tricopper(I)(3Cu—Cu)]

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s205322961502330x ◽

2016 ◽

Vol 72 (1) ◽

pp. 63-67 ◽

Cited By ~ 2

Author(s):

Muhammad Kaleem Khosa ◽

Paul T. Wood ◽

Simon M. Humphrey ◽

William T. A. Harrison

Keyword(s):

Coordination Polymer ◽

Three Dimensional ◽

Hydrothermal Conditions ◽

Complex Crystal Structure ◽

Metal Metal ◽

Copper Coordination ◽

Complex Crystal ◽

Cu Ions ◽

Cuprophilic Interactions

Compounds containing copper(I) are of interest for their role in biological processes. The nature of short (< ∼3.2 Å) Cu...Cu contacts within these compounds has been debated, being either described as weakly attractive (bonding) `cuprophilic' interactions, or simply as short metal–metal distances constrained by ligand geometry or largely ionic in nature. The title three-dimensional Cu+-containing coordination polymer, [Cu3(C7H7N2O2)Cl2]n, was formed from thein situreduction of CuCl2in the presence of 3,5-diaminobenzoic acid and KOH under hydrothermal conditions. Its complex crystal structure contains ten distinct CuIatoms, two of which lie on crystallographic inversion centres. The copper coordination geometries include near-linear CuOCl and CuN2, T-shaped CuOCl2and distorted tetrahedral CuOCl3groups. Each CuIatom is also associated with two adjacent metal atoms, with Cu...Cu distances varying from 2.7350 (14) to 3.2142 (13) Å; if all these are regarded as `cuprophilic' interactions, then infinite [\overline{1}01] zigzag chains of CuIatoms occur in the crystal. The structure is consolidated by N—H...Cl hydrogen bonds.

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Ag–Loaded Polypyrrole/Carbon Nanotube: One-Step In Situ Polymerization and Improved Capacitance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.531.35 ◽

2012 ◽

Vol 531 ◽

pp. 35-38 ◽

Cited By ~ 1

Author(s):

Hong Yu Mi ◽

You Long Xu

Keyword(s):

Carbon Nanotube ◽

In Situ Polymerization ◽

Conductive Polymer ◽

Three Dimensional ◽

High Specific Capacitance ◽

Electrochemical Reversibility ◽

Nanotube Composites ◽

One Step ◽

Carbon Nanotube Composites

Ternary composites of Ag–loaded polypyrrole/carbon nanotube (Ag–PPy/CNT) are prepared using a one–step in situ polymerization. Ag nanoparticles are uniformly decorated on the core–shell PPy/CNT networks. This approach provides a simple, easily accessible strategy for preparing three–dimensional noble metal–conductive polymer–carbon nanotube composites. Electrochemical properties of Ag–loaded composites are evaluated to understand the effect of Ag on the structure and kinetic process of the composite. Results indicate that the composites have good electrochemical reversibility and high specific capacitance. The specific capacitiance of Ag–PPy/CNT composites are enhanced greatly from 206.7 F g–1 of PPy/CNT composites to 528.6 F g–1 at 3 mA cm–2. This demonstrates that combining nano–sized Ag with supercapacitor materials is very effective in promoting electrochemical performance of materials.

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Crystal structure of bis(μ-{2-[(5-bromo-2-oxidobenzylidene)amino]ethyl}sulfanido-κ3 N,O,S){2,2′-[(3,4-dithiahexane-1,6-diyl)bis(nitrilomethanylylidene)]bis(4-bromophenolato)-κ4 O,N,N′,O′}dicobalt(III) dimethylformamide monosolvate

Acta Crystallographica Section E Crystallographic Communications ◽

10.1107/s2056989019007217 ◽

2019 ◽

Vol 75 (6) ◽

pp. 863-866

Author(s):

Julia A. Rusanova ◽

Vladimir N. Kokozay ◽

Olena Bondarenko

Keyword(s):

Crystal Structure ◽

Solvent Molecule ◽

Three Dimensional ◽

Coordination Geometry ◽

Asymmetric Unit ◽

Dimensional Network ◽

Distorted Octahedral ◽

Van Der Waals Radii ◽

Spontaneous Oxidation

The title binuclear CoIII complex, [Co2(C9H8BrNOS)2(C18H16Br2N2O2S2)]·C3H7NO, with a Schiff base ligand formed in situ from cysteamine (2-aminoethanethiol) and 5-bromosalicylaldehyde crystallizes in the space group P21. It was found that during the synthesis the ligand undergoes spontaneous oxidation, forming the new ligand H2 L′ having an S—S bond. Thus, the asymmetric unit consists of one Co2(L)2(L′) molecule and one DMF solvent molecule. Each CoIII ion has a slightly distorted octahedral S2N2O2 coordination geometry. In the crystal, the components are linked into a three-dimensional network by several S... Br, C... Br, C—H...Br, short S...C (essentially shorter than the sum of the van der Waals radii for the atoms involved) contacts as well by weak C—H...O hydrogen bonds. The crystal studied was refined as an inversion twin.

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Green Synthesis of Free Standing Cellulose/Graphene Oxide/Polyaniline Aerogel Electrode for High Performance Flexible All-solid-state Supercapacitors

10.20944/preprints202007.0482.v1 ◽

2020 ◽

Author(s):

Yueqin Li ◽

Zongbiao Xia ◽

Qiang Gong ◽

Xiaohui Liu ◽

Yong Yang ◽

...

Keyword(s):

Flexible Electronics ◽

High Performance ◽

In Situ Polymerization ◽

Lithium Bromide ◽

Three Dimensional ◽

Weight Ratio ◽

Porous Structures ◽

Free Standing ◽

Symmetric Configuration

The cellulose/GO networks as the scaffold of free-standing aerogel electrodes are developed by using lithium bromide aqueous solution as the solvent to ensure the complete dissolution of cotton linter pulp and well dispersion/reduction of GO nanosheets. PANI nanoclusters are then coated onto cellulose/GO networks via in-situ polymerization of aniline monomers. By optimized weight ratio of GO and PANI, the ternary cellulose/GO3.5/PANI aerogel film exhibits well-defined three-dimensional porous structures and high conductivity of 1.15 S/cm that contributes to its high areal specific capacitance of 1218 mF/cm2 at the current density of 1.0 mA/cm2. Utilizing this cellulose/GO3.5/PANI aerogel film as electrodes in a symmetric configuration supercapacitor can result in an outstanding energy density as high as 258.2 μWh/cm2 at a power density of 1201.4 μW/cm2. Moreover, the device can maintain nearly constant capacitance under different bending deformations, suggesting its promising applications in flexible electronics.

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