scholarly journals A strategy for the synthesis of cyclomatrix-polyphosphazene nanoparticles from non-aromatic monomers

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75552-75561 ◽  
Author(s):  
Zhangjun Huang ◽  
Feng Zheng ◽  
Shuangshuang Chen ◽  
Xuemin Lu ◽  
Cornelia Gertina Catharina Elizabeth van Sittert ◽  
...  
Keyword(s):  
Hybrid Structure ◽  
Organic Hybrid ◽  
New Class ◽  
Tunable Properties ◽  
Significant Interest

Cyclomatrix-polyphosphazenes (C-PPZs) are a new class of nanomaterials that have attracted significant interest owing to their unique inorganic–organic hybrid structure and tunable properties.

Efficient Synthesis and Photochromic Properties of a New Diarylethene Bearing a Condensed Aromatics Moiety

2012 ◽  
Vol 455-456 ◽  
pp. 33-36
Author(s):  
Ren Jie Wang ◽  
Hong Ying Xia ◽  
Gang Liu ◽  
Shi Qiang Cui
Keyword(s):  
Uv Light ◽  
Optical Storage ◽  
Hybrid Structure ◽  
Order Reaction ◽  
Pmma Film ◽  
Efficient Synthesis ◽  
Photochromic Properties ◽  
First Order ◽  
New Class ◽  
Hexane Solution

A new class of diarylethenes based on a hybrid structure of thiophene and naphthalene has been developed and its properties including photochromism, kinetics and fluorescence were investigated in detail. The results showed that the compound exhibited obvious photochromism, changing from colorless to red after irradiation with 297 nm UV light both in solution and in PMMA film. The kinetic experiments indicated that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction in hexane solution. At last, the results demonstrated that the diarylethene compound had attractive properties for potential application in optical storage.

scholarly journals Carbon-boron clathrates as a new class of sp3-bonded framework materials

2020 ◽  
Vol 6 (2) ◽  
pp. eaay8361 ◽  
Author(s):  
Li Zhu ◽  
Gustav M. Borstad ◽  
Hanyu Liu ◽  
Piotr A. Guńka ◽  
Michael Guerette ◽  
...  
Keyword(s):  
Design Principle ◽  
Three Dimensional ◽  
Structure Type ◽  
Framework Materials ◽  
New Class ◽  
Tunable Properties ◽  
Chemical Design ◽  
Boron Substitution ◽  
Carbon Based

Carbon-based frameworks composed of sp3 bonding represent a class of extremely lightweight strong materials, but only diamond and a handful of other compounds exist despite numerous predictions. Thus, there remains a large gap between the number of plausible structures predicted and those synthesized. We used a chemical design principle based on boron substitution to predict and synthesize a three-dimensional carbon-boron framework in a host/guest clathrate structure. The clathrate, with composition 2Sr@B6C6, exhibits the cubic bipartite sodalite structure (type VII clathrate) composed of sp3-bonded truncated octahedral C12B12 host cages that trap Sr2+ guest cations. The clathrate not only maintains the robust nature of diamond-like sp3 bonding but also offers potential for a broad range of compounds with tunable properties through substitution of guest atoms within the cages.

Formation and distortion of iodidoantimonates(III): the first isolated [SbI6]3−octahedron

2017 ◽  
Vol 73 (3) ◽  
pp. 432-442 ◽  
Author(s):  
Maciej Bujak
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Crystal Engineering ◽  
Structural Parameters ◽  
Hybrid Structure ◽  
Organic Hybrid ◽  
Hydrogen Bond Interactions ◽  
Different Types ◽  
Spatial Dimensions ◽  
Induced Changes

The ability to intentionally construct, through different types of interactions, inorganic–organic hybrid materials with desired properties is the main goal of inorganic crystal engineering. The primary deformation, related to intrinsic interactions within inorganic substructure, and the secondary deformation, mainly caused by the hydrogen bond interactions, are both responsible for polyhedral distortions of halogenidoantimonates(III) with organic cations. The evolution of structural parameters, in particular the Sb—I secondary- and O/N/C—H...I hydrogen bonds, as a function of temperature assists in understanding the contribution of those two distortion factors to the irregularity of [SbI6]3−polyhedra. In tris(piperazine-1,4-diium) bis[hexaiodidoantimonate(III)] pentahydrate, (C4H12N2)3[SbI6]2·5H2O (TPBHP), where the isolated [SbI6]3–units were found, distortion is governed only by O/N/C—H...I hydrogen bonds, whereas in piperazine-1,4-diium bis[tetraiodidoantimonate(III)] tetrahydrate, (C4H12N2)[SbI4]2·4H2O (PBTT), both primary and O—H...I secondary factors cause the deformation of one-dimensional [{SbI4}n]n−chains. The larger in spatial dimensions piperazine-1,4-diium cations, in contrast to the smaller water of crystallization molecules, do not significantly contribute to the octahedral distortion, especially in PBTT. The formation of isolated [SbI6]3−ions in TPBHP is the result of specific second coordination sphere hydrogen bond interactions that stabilize the hybrid structure and simultaneously effectively separate and prevent [SbI6]3−units from mutual interactions. The temperature-induced changes, further supported by the analysis of data retrieved from the Cambridge Structural Database, illustrate the significance of both primary and secondary distortion factors on the deformation of octahedra. Also, a comparison of packing features in the studied hybrids with those in the non-metal containing piperazine-1,4-diium diiodide diiodine (C4H12N2)I2·I2(PDD) confirms the importance and hierarchy of different types of interactions.

scholarly journals Unravelling the antimicrobial activity of peptide hydrogel systems: Current and future perspectives

Soft Matter ◽  
2021 ◽  
Author(s):  
Emily Cross ◽  
Sophie M Coulter ◽  
Sreekanth Pentlavalli ◽  
Garry Laverty
Keyword(s):  
Drug Delivery ◽  
Antimicrobial Activity ◽  
Antimicrobial Peptides ◽  
Future Perspectives ◽  
New Class ◽  
Significant Interest ◽  
Peptide Hydrogel

The use of hydrogels has garnered significant interest as biomaterial and drug delivery platforms for anti-infective applications. For decades antimicrobial peptides have been heralded as a much needed new class...

Fiber Reinforced Epoxy Resin Composite Materials Using Carboxylate-Alumoxanes as Cross-Linking Agents

1999 ◽  
Vol 581 ◽  
Author(s):  
Cullen T. Vogelson ◽  
Yoshihiro Koide ◽  
Andrew R. Barrona
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
Diglycidyl Ether ◽  
Alumina Nanoparticles ◽  
Resin Matrix ◽  
Hybrid Resin ◽  
Organic Hybrid ◽  
New Class ◽  
Epoxy Resin Composite ◽  
Ceramic Fillers

ABSTRACTChemically functionalized alumina nanoparticles (carboxylate-alumoxanes) are used as the inorganic component of a new class of inorganic-organic hybrid materials. Lysine- or para- hydroxybenzoic acid-derivatized alumoxanes are readily prepared from the reaction of boehmite, [Al(O)(OH)]n, with the appropriate carboxylic acid. The peripheral organic hydroxides and amines of these carboxylate-alumoxanes either react directly with epoxide resins, such as the diglycidyl ether of bisphenol-A (DER 332), to form a hybrid material, or in the presence of an organic resin and hardener system to form a composite material. SEM and AFM show a uniform distribution of alumina nanoparticles within the resin matrix. The properties and cure times of the alumoxane hybrid and composite materials are distinct from both the pure resins and from a physical blend of the resins with traditional ceramic fillers. A significant increase in thermal stability and tensile strength is observed for both the hybrid and composite resin systems. In addition, both carbon fiber and carbon/Kevlar® matting have been successfully incorporated into the hybrid resin systems resulting in further property improvements.

Preparation and physicochemical properties of microcapsules containing phase-change material with graphene/organic hybrid structure shells

2017 ◽  
Vol 5 (45) ◽  
pp. 23937-23951 ◽  
Author(s):  
Jun-Feng Su ◽  
Xin-Yu Wang ◽  
Shan Han ◽  
Xiao-Long Zhang ◽  
Yan-Dong Guo ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Phase Change ◽  
Phase Change Material ◽  
Electric Charge ◽  
Hybrid Structure ◽  
Organic Hybrid ◽  
Change Material

MicroPCMs were fabricated with a graphene/organic hybrid structure through the actions of electric charge absorption and long-molecular entanglement.

scholarly journals Effects of Protonation, Hydroxylamination, and Hydrazination of g-C3N4 on the Performance of Matrimid®/g-C3N4 Membranes

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1010
Author(s):  
María Soto-Herranz ◽  
Mercedes Sánchez-Báscones ◽  
Antonio Hérnandez-Giménez ◽  
José Calvo-Díez ◽  
Jesús Martín-Gil ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Oxygen Plasma ◽  
Polymeric Membranes ◽  
Mixed Matrix Membranes ◽  
Oxygen Plasma Treatment ◽  
Mixed Matrix ◽  
Hydrazine Monohydrate ◽  
New Class ◽  
Chemically Modified ◽  
Significant Interest

One of the challenges to continue improving polymeric membranes properties involves the development of novel chemically modified fillers, such as nitrogen-rich 2-D nanomaterials. Graphitic carbon nitride (g-C3N4) has attracted significant interest as a new class of these fillers. Protonation is known to afford it desirable functionalities to form unique architectures for various applications. In the work presented herein, doping of Matrimid® with protonated g-C3N4 to yield Matrimid®/g-C3N4 mixed matrix membranes was found to improve gas separation by enhancing the selectivity for CO2/CH4 by up to 36.9% at 0.5 wt % filler doping. With a view to further enhancing the contribution of g-C3N4 to the performance of the composite membrane, oxygen plasma and hydrazine monohydrate treatments were also assayed as alternatives to protonation. Hydroxylamination by oxygen plasma treatment increased the selectivity for CO2/CH4 by up to 52.2% (at 2 wt % doping) and that for O2/N2 by up to 26.3% (at 0.5 wt % doping). Hydrazination led to lower enhancements in CO2/CH4 separation, by up to 11.4%. This study suggests that chemically-modified g-C3N4 may hold promise as an additive for modifying the surface of Matrimid® and other membranes.

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