Development of highly performant hybrid materials based on phthalonitrile resin for a simultaneous ballistic and nuclear shielding protection

In this study, a new high-performance hybrid material was designed targeting an efficient ballistic and nuclear shielding protection. To achieve this goal, a typical highly performant thermosetting resin, namely the phthalonitrile (PN) resin, was reinforced with Kevlar fibers (KF-29), as continuous phase, and erbium oxide (Er2O3) nanoparticles, as discontinuous phase. The reinforcing phases underwent a silane surface modification to create a fully connected network aiming an improved stress transfer between the constituents. The mechanical investigations through tensile and bending testing confirmed the positive effect of the addition of an increasing amount (up to 20 wt%) of the Er2O3 nanoparticles. The hybrids also provided excellent gamma rays shielding performances with a screening ratio of about 33% for a 3 cm thick sample. In the meantime, the ballistic tests evaluated under the National Institute of Justice standard (NIJ standard-0101.06-IIA) also highlighted an improved kinetic energy absorption following the increase in the amounts of the discontinuous phase. Overall, this study unraveled for the first time ever the benefits obtained from a fully connected hybrid network in the field of ballistic and radiation protection.

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Toward an efficient stress transfer with a fully connected hybrid network from epoxy, oxidized UHMWPE fibers, and silane surface modified silicon carbide nanoparticles

Polymer Composites ◽

10.1002/pc.25839 ◽

2020 ◽

Author(s):

Raouf Belgacemi ◽

Mehdi Derradji ◽

Djalal Trache ◽

Abdeldjalil Zegaoui ◽

Oussama Mehelli

Keyword(s):

Silicon Carbide ◽

Stress Transfer ◽

Hybrid Network ◽

Silicon Carbide Nanoparticles ◽

Uhmwpe Fibers ◽

Surface Modified ◽

Fully Connected

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Advanced hybrid materials from epoxy, oxidized UHMWPE fibers and silane surface modified silicon nitride nanoparticles

High Performance Polymers ◽

10.1177/0954008320964547 ◽

2020 ◽

pp. 095400832096454

Author(s):

Raouf Belgacemi ◽

Mehdi Derradji ◽

Djalal Trache ◽

Abdeldjalil Zegaoui ◽

Oussama Mehelli ◽

...

Keyword(s):

Silicon Nitride ◽

Hybrid Materials ◽

Stress Transfer ◽

Surface Modifications ◽

Hybrid Network ◽

Uhmwpe Fibers ◽

Surface Modified ◽

Fully Connected ◽

Intended Use ◽

Uhmwpe Composite

Aiming the development of highly performant polymer-based hybrid materials, the typical bisphenol-A based epoxy resin was reinforced with oxidized UHMWPE fibers and various amounts of silane surface modified silicon nitride (Si3N4) nanoparticles. The reinforcing phases underwent optimized surface modifications to create a fully connected network for an improved stress transfer between the constituents. The efficiency of the grafting methodology was confirmed by vibrational and morphological analyses. Meanwhile, the effects of the adopted modifications techniques on the mechanical properties were thoroughly discussed. Furthermore, static and dynamic mechanical investigations along with impact tests were conducted to study the effects of various amounts of Si3N4 nanoparticles on the overall performances of the epoxy/UHMWPE composite. The obtained results confirmed the great benefits from creating a fully connected hybrid network. The as such developed hybrids can be seen as promising materials for the intended use.

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Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

10.26434/chemrxiv.11231153.v1 ◽

2019 ◽

Author(s):

Kent Griffith ◽

Clare Grey

Keyword(s):

High Performance ◽

Rate Capability ◽

Block Size ◽

Lithium Intercalation ◽

Resonance Spectroscopy ◽

Complex Metal Oxides ◽

Battery Electrode ◽

Crystallographic Shear ◽

Battery Material ◽

First Time

Nb18W8O69 (9Nb2O5×8WO3) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (cs) structures within the Nb2O5–WO3 series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 ´ 5 units of corner-shared MO6 octahedra between the shear planes, giving rise to 2 nm ´ 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and 7Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity. In addition to its promising rate capability, Nb18W8O69 adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.

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High-Performance Natural Rubber/Graphene Composites from a Uniquely Designed Physical and Chemical Hybrid-Network

International Polymer Processing ◽

10.3139/217.3889 ◽

2020 ◽

Vol 35 (2) ◽

pp. 146-157

Author(s):

B.-L. Yu ◽

L.-C. Jiang ◽

K. Huang ◽

X.-L. Liu ◽

X.-M. Shao ◽

...

Keyword(s):

Natural Rubber ◽

High Performance ◽

Hybrid Network ◽

Physical And Chemical

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Development of an HPLC-UV Method for Quantification of Stattic

Current Pharmaceutical Analysis ◽

10.2174/1573412914666180523092957 ◽

2019 ◽

Vol 15 (6) ◽

pp. 568-573

Author(s):

Soheil Sedaghat ◽

Ommoleila Molavi ◽

Akram Faridi ◽

Ali Shayanfar ◽

Mohammad Reza Rashidi

Keyword(s):

High Performance ◽

Accurate Method ◽

Plasma Samples ◽

Promising Target ◽

Relative Standard ◽

Dimerization Inhibitor ◽

Oncogenic Protein ◽

First Time ◽

Transcription 3

Background: Signal transducer and activator of transcription 3 (STAT3), an oncogenic protein found constitutively active in many types of human malignancies, is considered to be a promising target for cancer therapy. Objective: In this study for the first time, a simple and accurate method has been developed for the determination of a STAT3 dimerization inhibitor called stattic in aqueous and plasma samples. Methods: A reverse-phase high-performance liquid chromatography (RP-HPLC) composed of C18 column as stationary phase, and the mixture of acetonitrile (60%) and water (40%) as mobile phase with a UV detection at 215 nm were applied for quantification of stattic. The developed method was validated by Food and Drug Administration (FDA) guideline. Results: The method provided a linear range between 1-40 and 2.5-40 µg mL-1 for aqueous and plasma samples, respectively, with a correlation coefficient of 0.999. The accuracy (as recovery) of the developed method was found to be between 95-105% for aqueous medium and 85-115% for plasma samples. The precision (as relative standard deviation) for aqueous and plasma samples was less than 6% and 15%, respectively. The sensitivity of the developed method based on FDA guideline was 1 µg mL-1 for aqueous and 2.5 µg mL-1 for plasma samples. Conclusion: These results show that the established method is a fast and accurate quantification for stattic in aqueous and plasma samples.

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Histochemical and Phytochemical Analysis of Lamium album subsp. album L. Corolla: Essential Oil, Triterpenes, and Iridoids

Molecules ◽

10.3390/molecules26144166 ◽

2021 ◽

Vol 26 (14) ◽

pp. 4166

Author(s):

Agata Konarska ◽

Elżbieta Weryszko-Chmielewska ◽

Anna Matysik-Woźniak ◽

Aneta Sulborska ◽

Beata Polak ◽

...

Keyword(s):

Essential Oil ◽

High Performance ◽

Glandular Trichomes ◽

Gas Chromatography Mass Spectrometry ◽

Phytochemical Analysis ◽

Lipophilic Compounds ◽

Histochemical Tests ◽

Microscopy Techniques ◽

Trichome Types ◽

First Time

The aim of this study was to conduct a histochemical analysis to localize lipids, terpenes, essential oil, and iridoids in the trichomes of the L. album subsp. album corolla. Morphometric examinations of individual trichome types were performed. Light and scanning electron microscopy techniques were used to show the micromorphology and localization of lipophilic compounds and iridoids in secretory trichomes with the use of histochemical tests. Additionally, the content of essential oil and its components were determined using gas chromatography-mass spectrometry (GC-MS). Qualitative analyses of triterpenes carried out using high-performance thin-layer chromatography (HPTLC) coupled with densitometric detection, and the iridoid content expressed as aucubin was examined with spectrophotometric techniques. We showed the presence of iridoids and different lipophilic compounds in papillae and glandular and non-glandular trichomes. On average, the flowers of L. album subsp. album yielded 0.04 mL/kg of essential oil, which was dominated by aldehydes, sesquiterpenes, and alkanes. The extract of the L. album subsp. album corolla contained 1.5 × 10−3 ± 4.3 × 10−4 mg/mL of iridoid aucubin and three triterpenes: oleanolic acid, β-amyrin, and β-amyrin acetate. Aucubin and β-amyrin acetate were detected for the first time. We suggest the use of L. album subsp. album flowers as supplements in human nutrition.

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Nanostructured intermetallic InSb as a high-capacity and high-performance negative electrode for sodium-ion batteries

Sustainable Energy & Fuels ◽

10.1039/d1se00386k ◽

2021 ◽

Author(s):

Irshad Mohammad ◽

Lucie Blondeau ◽

Eddy Foy ◽

Jocelyne Leroy ◽

Eric Leroy ◽

...

Keyword(s):

Intermetallic Compound ◽

High Performance ◽

High Capacity ◽

Negative Electrode ◽

Sodium Ion ◽

Sodium Ion Batteries ◽

Negative Electrodes ◽

First Time

Following the trends of alloys as negative electrodes for Na-ion batteries, the sodiation of the InSb intermetallic compound was investigated for the first time. The benefit of coupling Sb with...

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Comparison of α-Tocopherol, α-Tocopherol Acetate, and α-Tocopheryl Polyethylene Glycol Succinate 1000 Absorption by Caco-2 TC7 Intestinal Cells

Nutrients ◽

10.3390/nu13010129 ◽

2020 ◽

Vol 13 (1) ◽

pp. 129

Author(s):

Charlotte Cuerq ◽

Claire Bordat ◽

Charlotte Halimi ◽

Emilie Blond ◽

Marion Nowicki ◽

...

Keyword(s):

Polyethylene Glycol ◽

High Performance ◽

Lipid Extraction ◽

Free Form ◽

Glycol Succinate ◽

Tocopherol Acetate ◽

Apical Side ◽

Basolateral Side ◽

Human Enterocyte ◽

First Time

(1) Background: vitamin E is often supplemented in the form of tocopherol acetate, but it has poor bioavailability and can fail to correct blood tocopherol concentrations in some patients with severe cholestasis. In this context, α-tocopheryl polyethylene glycol succinate 1000 (TPGS) has been of value, but very little is known about the mechanisms of its absorption. The aim of our work was to evaluate the mechanisms of absorption/secretion of TPGS compared to tocopherol acetate (TAC) and α-tocopherol by human enterocyte-like Caco-2 TC7 cells. (2) Methods: two weeks post-confluence Caco-2 cells were incubated with tocopherol- or TAC- or TPGS-rich mixed micelles up to 24 h and, following lipid extraction, TAC and tocopherol amounts were measured by high performance liquid chromatography (HPLC) in apical, cellular, and basolateral compartments. (3) Results: at equivalent concentrations of tocopherol in the apical side, the amounts of tocopherol secreted at the basolateral pole of Caco-2 cells are (i) significantly greater when the tocopherol is in the free form in the micelles; (ii) intermediate when it is in the TAC form in the micelles (p < 0.001); and (iii) significantly lower with the TPGS form (p < 0.0001). Interestingly, our results show, for the first time, that Caco-2 cells secrete one or more esterified forms of the vitamin contained in TPGS at the basolateral side.

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An expanded isoindigo unit as a new building block for a conjugated polymer leading to high-performance solar cells

Journal of Materials Chemistry A ◽

10.1039/c3ta15291j ◽

2014 ◽

Vol 2 (15) ◽

pp. 5427-5433 ◽

Cited By ~ 34

Author(s):

Shugang Li ◽

Zhongcheng Yuan ◽

Jianyu Yuan ◽

Ping Deng ◽

Qing Zhang ◽

...

Keyword(s):

Solar Cells ◽

Solar Cell ◽

Building Block ◽

Conjugated Polymer ◽

High Performance ◽

Fill Factor ◽

Solar Cell Device ◽

Donor Acceptor ◽

First Time

An expanded isoindigo unit (IBTI) has been incorporated into a donor–acceptor conjugated polymer for the first time. The PCE of the solar cell device based on the new polymer reached 6.41% with a fill factor of 0.71.

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