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

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.

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

2020 ◽  
pp. 095400832095452
Author(s):  
Oussama Mehelli ◽  
Mehdi Derradji ◽  
Raouf Belgacemi ◽  
Abdeldjalil Zegaoui ◽  
Kamel Khimeche ◽  
...  
Keyword(s):  
High Performance ◽  
Stress Transfer ◽  
Continuous Phase ◽  
Hybrid Network ◽  
Thick Sample ◽  
National Institute Of Justice ◽  
Nuclear Shielding ◽  
Discontinuous Phase ◽  
Fully Connected ◽  
First Time

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.

A multi-pronged approach to low-pressure Cu sintering using surface-modified particles, substrate and chip metallization

2019 ◽  
Vol 2019 (1) ◽  
pp. 000387-000392 ◽  
Author(s):  
Sri Krishna Bhogaraju ◽  
Omid Mokhtari ◽  
Jacopo Pascucci ◽  
Fosca Conti ◽  
Hiren R Kotadia ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Cost ◽  
Surface Modifications ◽  
Low Pressure ◽  
Bonding Pressure ◽  
High Tendency ◽  
Promising Alternative ◽  
Die Attach ◽  
Bandgap Semiconductors ◽  
Surface Modified

Abstract High temperature power electronics based on wide-bandgap semiconductors have prominent applications, such as automotive, aircrafts, space exploration, oil/gas extraction, electricity distribution. Die-attach bonding process is an essential process in the realization of high temperature power devices. Here Cu offers to be a promising alternative to Ag, especially because of thermal and mechanical properties on par with Ag and a cost advantage by being a factor 100 cheaper than Ag. With the aim to achieve a low-pressure Cu sintering process, a low cost wet chemical etching process is developed to selectively etch Zn from brass to create nano-porous surface modifications to enhance sinterability, enabling sintering with low bonding pressure of 1MPa and at temperatures below 300°C. However, high tendency of Cu to oxidize poses a major challenge in realizing stable interconnects. For this purpose, in this contribution, we present the use of polyethylene-glycol 600 as reducing binder in the formulation of the Cu sintering paste. Finally, we propose a multi-pronged approach based on three crucial factors: surface-modified substrates, nanostructured surface modifications on micro-scale Cu-alloy particles and use of a reducing binder in the Cu particle paste.

scholarly journals Rivet-Inspired Modification of Aramid Fiber by Decorating with Silica Particles to Enhance the Interfacial Interaction and Mechanical Properties of Rubber Composites

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2665
Author(s):  
Yihang Li ◽  
Yuzhu Xiong ◽  
Qingpo Zhang
Keyword(s):  
Hybrid Materials ◽  
High Performance ◽  
High Surface ◽  
Silica Particles ◽  
Interfacial Interaction ◽  
Aramid Fiber ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Large Numbers ◽  
Surface Modified

A rivet–inspired method of decorating aramid fiber (AF) with silica particles (SiO2) is proposed to produce SiO2@AF hybrid materials that have largely enhanced interfacial interaction with the rubber matrix. AF was firstly surface-modified with polyacrylic acid (PAA) to obtain PAA–AF, and SiO2 was silanized with 3-aminopropyltriethoxysilane to obtain APES–SiO2. Then, SiO2@AF was prepared by chemically bonding APES–SiO2 onto the surface of PAA–AF in the presence of dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP). With the incorporation of SiO2@AF into the rubber matrix, SiO2@AF hybrid materials with high surface roughness can play a role as ‘rivets’ to immobilize large numbers of rubber chains on the surface. The tear strength and tensile strength of rubber composite that filling 4 phr SiO2@AF are dramatically increased by 97.8% and 89.3% compared to pure rubber, respectively. Furthermore, SiO2@AF has superiority in enhancing the cutting resistance of rubber composites, in contrast with unmodified AF and SiO2. SiO2@AF is suitable to be applied as a novel reinforcing filler in rubber composites for high performance.

scholarly journals Surface Modifications of Positive-Electrode Materials for Lithium Ion Batteries

2019 ◽  
Vol 73 (11) ◽  
pp. 880-893 ◽  
Author(s):  
Nam Hee Kwon ◽  
Joanna Conder ◽  
Mohammed Srout ◽  
Katharina M. Fromm
Keyword(s):  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Surface Modifications ◽  
Positive Electrode ◽  
Layered Oxides ◽  
Spinel Type ◽  
Surface Modified ◽  
Positive Electrode Materials

Lithium ion batteries are typically based on one of three positive-electrode materials, namely layered oxides, olivine- and spinel-type materials. The structure of any of them is 'resistant' to electrochemical cycling, and thus, often requires modification/post-treatment to improve a certain property, for example, structural stability, ionic and/or electronic conductivity. This review provides an overview of different examples of coatings and surface modifications used for the positive-electrode materials as well as various characterization techniques often chosen to confirm/detect the introduced changes. It also assesses the electrochemical success of the surface-modified positive-electrode materials, thereby highlighting remaining challenges and pitfalls.

Experimental Investigation of Surface Modified Abaca Fibre

2020 ◽  
Vol 978 ◽  
pp. 291-295 ◽  
Author(s):  
Agnivesh Kumar Sinha ◽  
Harendra Kumar Narang ◽  
Somnath Bhattacharya
Keyword(s):  
Polymer Composites ◽  
Amorphous Materials ◽  
Crystallinity Index ◽  
Surface Modifications ◽  
Xrd Analysis ◽  
Natural Fibres ◽  
Ftir Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Modified

Natural fibres have gained popularity due to their use in fabrication of biodegradable polymer composites which are not only non-polluting but are also light weight and inexpensive. Abaca fibres are known for their remarkable properties for which their polymer composites are used in automotive applications. However, hydrophilicity and compatibility with polymer matrices are the two major drawbacks of natural fibres which restrict their use as reinforcements in polymer composites. Therefore, present study deals with the surface modifications of abaca fibre using potassium permanganate and sodium hydroxide solutions to enhance crystallinity and reduce hydrophilicity of abaca fibres. Further, the surfaces of untreated and treated fibre were investigated with the help of Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis. Surface treatment of abaca fibre led to the removal of unwanted wax, and other amorphous materials which was confirmed through FTIR analysis. Crystallinity index was found to be 57%, 59% and 61% for untreated, NaOH treated and KMnO4 treated abaca fibre respectively.

scholarly journals Surface Modification of Hemoglobin-Based Oxygen Carriers Reduces Recognition by Haptoglobin, Immunoglobulin, and Hemoglobin Antibodies

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 454 ◽  
Author(s):  
Ausanai Prapan ◽  
Nittiya Suwannasom ◽  
Chiraphat Kloypan ◽  
Saranya Chaiwaree ◽  
Axel Steffen ◽  
...  
Keyword(s):  
Surface Modification ◽  
Biomedical Applications ◽  
Binding Capacity ◽  
Surface Modifications ◽  
The Body ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Oxygen Binding ◽  
Oxygen Carriers ◽  
Surface Modified

Hemoglobin-based oxygen carriers (HBOCs) represent a propitious type of blood substitute to transport oxygen throughout the body while acting as a carrier in biomedical applications. However, HBOCs in blood are recognized and rapidly scavenged by the body’s innate immune systems. To overcome this problem, HBOCs require a surface modification that provides protection against detection and elimination in order to prolong their circulation time after administration. In this study, we investigated different surface modifications of hemoglobin submicron particles (HbMPs) by double/triple precipitation, as well as by adsorption of human serum albumin (HSA), hyaluronic acid (HA), and pluronic (Plu) to discover how diverse surface modifications influence the oxygen binding capacity and the binding of anti-hemoglobin (Hb) antibodies, immunoglobulin G (IgG), and haptoglobin (HP) to HbMPs. The particle size and zeta potential of the six types of HbMP modifications were analyzed by zeta sizer, confocal laser scanning microscopy, and transmission electron microscopy (TEM), and were compared to the unmodified HbMPs. The results revealed that all surface-modified HbMPs had a submicron size with a negative charge. A slight decrease in the oxygen binding capacity was noticed. The specific binding of anti-Hb antibodies, IgG, and HP to all surface-modified HbMPs was reduced. This indicates a coating design able to protect the particles from detection and elimination processes by the immune system, and should lead to a delayed clearance and the required and essential increase in half-life in circulation of these particles in order to fulfill their purpose. Our surface modification method reflects a promising strategy for submicron particle design, and can lead the way toward novel biomedical applications.

Mechanical properties of fiber reinforced styrene–butadiene rubbers using surface-modified UHMWPE fibers under EB irradiation

2006 ◽  
Vol 42 (5) ◽  
pp. 1008-1014 ◽  
Author(s):  
Y. Kondo ◽  
K. Miyazaki ◽  
Y. Yamaguchi ◽  
T. Sasaki ◽  
S. Irie ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fiber Reinforced ◽  
Uhmwpe Fibers ◽  
Surface Modified ◽  
Styrene Butadiene

scholarly journals Surface Modified Silicon Nitride Powder with Highly Dispersed Sintering Aid via Aqueous Processing.

2000 ◽  
Vol 108 (1261) ◽  
pp. 790-794
Author(s):  
Yasuhiro SHIMIZU ◽  
Yasuo IKEDA ◽  
Takeo HYODO ◽  
Yuji TAKAO ◽  
Makoto EGASHIRA
Keyword(s):  
Silicon Nitride ◽  
Nitride Powder ◽  
Aqueous Processing ◽  
Sintering Aid ◽  
Highly Dispersed ◽  
Silicon Nitride Powder ◽  
Surface Modified

scholarly journals Effect of Various Surface Treatments on the Performance of Jute Fibers Filled Natural Rubber (NR) Composites

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 369 ◽  
Author(s):  
Kumarjyoti Roy ◽  
Subhas Chandra Debnath ◽  
Lazaros Tzounis ◽  
Aphiwat Pongwisuthiruchte ◽  
Pranut Potiyaraj
Keyword(s):  
Natural Rubber ◽  
Alkali Treatment ◽  
Density Measurement ◽  
Tensile Modulus ◽  
Stress Transfer ◽  
Treatment Method ◽  
Surface Treatments ◽  
Silane Treatment ◽  
Jute Fibers ◽  
Surface Modified

In the present study, the suitability of various chemical treatments to improve the performance of jute fibers (JFs) filled natural rubber (NR) composites was explored. The surface of JFs was modified by three different surface treatments, namely, alkali treatment, combined alkali/stearic acid treatment and combined alkali/silane treatment. Surface modified JFs were characterized by X-ray diffraction (XRD) pattern, Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FESEM). The reinforcing effect of untreated and surface treated JFs in NR composites was comparatively evaluated in terms of cure, mechanical, morphological and thermal properties. Combined alkali/silane treated JFs filled NR composite showed considerably higher torque difference, tensile modulus, hardness and tensile strength as compared to either untreated or other surface treated JFs filled NR systems. A crosslink density measurement suggested effective rubber-fibers interaction in combined alkali/silane treated JFs filled NR composite. Morphological analysis confirmed the improvement in the interfacial bonding between NR matrix and JFs due to combined alkali/silane treatment allowing an efficient “stress-transfer” mechanism. As a whole, combined alkali/silane treatment was found to be most efficient surface treatment method to develop strong interfacial adhesion between NR matrix and JFs.

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