journal
https://read.qxmd.com/read/38473696/biocomposite-materials-derived-from-andropogon-halepensis-eco-design-and-biophysical-evaluation
#1
JOURNAL ARTICLE
Marcela-Elisabeta Barbinta-Patrascu, Cornelia Nichita, Bogdan Bita, Stefan Antohe
This research work presents a "green" strategy of weed valorization for developing silver nanoparticles (AgNPs) with promising interesting applications. Two types of AgNPs were phyto-synthesized using an aqueous leaf extract of the weed Andropogon halepensis L. Phyto-manufacturing of AgNPs was achieved by two bio-reactions, in which the volume ratio of (phyto-extract)/(silver salt solution) was varied. The size and physical stability of Andropogon -AgNPs were evaluated by means of DLS and zeta potential measurements, respectively...
March 6, 2024: Materials
https://read.qxmd.com/read/38473695/electrical-and-electro-thermal-characteristics-of-carbon-black-graphite-lldpe-composites-with-ptc-effect
#2
JOURNAL ARTICLE
Eduard-Marius Lungulescu, Cristina Stancu, Radu Setnescu, Petru V Notingher, Teodor-Adrian Badea
Electrical properties and electro-thermal behavior were studied in composites with carbon black (CB) or hybrid filler (CB and graphite) and a matrix of linear low-density polyethylene (LLDPE). LLDPE, a (co)polymer with low crystallinity but with high structural regularity, was less studied for Positive Temperature Coefficient (PTC) applications, but it would be of interest due to its higher flexibility as compared to HDPE. Structural characterization by scanning electron microscopy (SEM) confirmed a segregated structure resulted from preparation by solid state powder mixing followed by hot molding...
March 6, 2024: Materials
https://read.qxmd.com/read/38473694/properties-of-cementitious-materials-utilizing-seashells-as-aggregate-or-cement-prospects-and-challenges
#3
REVIEW
Yunpeng Zhu, Da Chen, Xiaotong Yu, Ruiwen Liu, Yingdi Liao
Nowadays, the sustainable development of the construction industry has become a focus of attention. Crushing and grinding waste seashells originating from the fishery industry, such as oyster shells, cockle shells, mussel shells, and scallop shells, into different particle sizes for usage as aggregate and cement in concrete or mortar provides an effective and sustainable solution to environmental problems by reducing natural resource dependence. Numerous studies have attempted to analyze the suitability of waste seashell as a possible alternative to natural aggregates and cement in concrete or mortar...
March 6, 2024: Materials
https://read.qxmd.com/read/38473693/evaluation-of-microstructure-and-abrasive-wear-resistance-of-medium-alloy-simo-ductile-cast-iron
#4
JOURNAL ARTICLE
Łukasz Dyrlaga, Renata Zapała, Krzysztof Morgiel, Andrzej Studnicki, Andrzej Szczęsny, Dariusz Kopyciński
Medium-alloy ductile iron with a SiMo ferritic matrix has very good heat resistance. The addition of chromium and aluminum also increases this resistance. This article presents the impact of chromium and aluminum on the structure of SiMo cast iron, especially their impact on the deformation of the spherical graphite precipitates and the formation of M6 C and M3 C2 carbide phases. These carbides are formed in a ferritic matrix or at the grain boundaries, resulting in increased hardness and a drastic reduction in impact strength...
March 6, 2024: Materials
https://read.qxmd.com/read/38473692/suitability-of-gelatin-methacrylate-and-hydroxyapatite-hydrogels-for-3d-bioprinted-bone-tissue
#5
JOURNAL ARTICLE
Paul Stolarov, Jonathan de Vries, Sean Stapleton, Lauren Morris, Kari Martyniak, Thomas J Kean
BACKGROUND: Complex bone defects are challenging to treat. Autografting is the gold standard for regenerating bone defects; however, its limitations include donor-site morbidity and increased surgical complexity. Advancements in 3D bioprinting (3DBP) offer a promising alternative for viable bone grafts. In this experiment, gels composed of varying levels of gelatin methacrylate (GelMA) and hydroxyapatite (HA) and gelatin concentrations are explored. The objective was to increase the hydroxyapatite content and find the upper limit before the printability was compromised and determine its effect on the mechanical properties and cell viability...
March 6, 2024: Materials
https://read.qxmd.com/read/38473691/soft-tissue-substitutes-in-periodontal-and-peri-implant-soft-tissue-augmentation-a-systematic-review
#6
REVIEW
Roberto Rotundo, Gian Luca Pancrazi, Alessia Grassi, Lara Ceresoli, Giovanna Laura Di Domenico, Vanessa Bonafede
BACKGROUND: Different extracellular matrix (ECM)-based technologies in periodontal and peri-implant soft tissue augmentation have been proposed in the market. The present review compared the efficacy of soft tissue substitutes (STSs) and autogenous free gingival grafts (FGGs) or connective tissue grafts (CTGs) in mucogingival procedures to increase keratinized tissue (KT) width around teeth and implants. METHODS: Two independent examiners performed an electronic search on MEDLINE and the Cochrane Library based on the following PICOS format: (P) adult patients; (I) soft tissue substitutes and FGGs/CTGs; (C) STSs vs...
March 6, 2024: Materials
https://read.qxmd.com/read/38473690/amino-modified-graphene-oxide-from-kish-graphite-for-enhancing-corrosion-resistance-of-waterborne-epoxy-coatings
#7
JOURNAL ARTICLE
Shengle Hao, Siming Wan, Shiyu Hou, Bowen Yuan, Chenhui Luan, Ding Nan, Gen Huang, Deping Xu, Zheng-Hong Huang
Waterborne epoxy (WEP) coatings with enhanced corrosion resistance were prepared using graphene oxide (GO) that was obtained from kish graphite, and amino-functionalized graphene oxide (AGO) was modified by 2-aminomalonamide. The structural characteristics of the GO and AGO were analyzed using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). And the anti-corrosive performance of waterborne epoxy-cased composite coatings with different addition amounts of AGO was investigated using electrochemical measurements, pull-off adhesion tests, and salt spray tests...
March 6, 2024: Materials
https://read.qxmd.com/read/38473689/influence-of-accelerators-on-cement-mortars-using-fluid-catalytic-cracking-catalyst-residue-fcc-enhanced-mechanical-properties-at-early-curing-ages
#8
JOURNAL ARTICLE
Lourdes Soriano, María Victoria Borrachero, Ester Giménez-Carbo, Mauro M Tashima, José María Monzó, Jordi Payá
Supplementary cementitious materials (SCMs) have been used in the construction industry to mainly reduce the greenhouse gas emissions associated with Portland cement. Of SCMs, the petrochemical industry waste known as fluid catalytic cracking catalyst residue (FCC) is recognized for its high reactivity. Nevertheless, the binders produced using SCMs usually present low mechanical strength at early curing ages. This study aims to assess the effect of different accelerating additives (KOH, sodium silicate SIL, commercial additive SKR) on the mechanical strength of mortars containing FCC...
March 6, 2024: Materials
https://read.qxmd.com/read/38473688/the-influence-of-the-shielding-gas-flow-rate-on-the-mechanical-properties-of-tig-welded-butt-joints-of-commercially-pure-grade-1-titanium
#9
JOURNAL ARTICLE
Krzysztof Szwajka, Joanna Zielińska-Szwajka, Tomasz Trzepieciński
This article proposes as a novelty the differentiation of shielding-gas flow rates from both sides of the tungsten inert gas (TIG)-welded butt joints of commercially pure (CP) grade 1 titanium tubes. Such an approach is aimed at economically reducing the amount of protective gas used in TIG closed butt welding. The effect of the shielding-gas flow rate on the properties of CP grade 1 titanium butt-welded joints made using the tungsten inert gas (TIG)-welding method. Butt-welded joints were made for different values of the shielding-gas flow from the side of the root of the weld...
March 6, 2024: Materials
https://read.qxmd.com/read/38473687/controllable-technology-for-thermal-expansion-coefficient-of-commercial-materials-for-solid-oxide-electrolytic-cells
#10
JOURNAL ARTICLE
Ya Sun, Dun Jin, Xi Zhang, Qing Shao, Chengzhi Guan, Ruizhu Li, Fupeng Cheng, Xiao Lin, Guoping Xiao, Jianqiang Wang
Solid oxide electrolysis cell (SOEC) industrialization has been developing for many years. Commercial materials such as 8 mol% Y2 O3 -stabilized zirconia (YSZ), Gd0.1 Ce0.9 O1.95 (GDC), La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ (LSCF), La0.6 Sr0.4 CoO3-δ (LSC), etc., have been used for many years, but the problem of mismatched thermal expansion coefficients of various materials between cells has not been fundamentally solved, which affects the lifetime of SOECs and restricts their industry development. Currently, various solutions have been reported, such as element doping, manufacturing defects, and introducing negative thermal expansion coefficient materials...
March 6, 2024: Materials
https://read.qxmd.com/read/38473686/preparation-of-cs-ls-agnps-composites-and-photocatalytic-degradation-of-dyes
#11
JOURNAL ARTICLE
Jiabao Wu, Xinpeng Chen, Aijing Li, Tieling Xing, Guoqiang Chen
Synthetic dyes are prone to water pollution during use, jeopardizing biodiversity and human health. This study aimed to investigate the adsorption and photocatalytic assist potential of sodium lignosulfonate (LS) in in situ reduced silver nanoparticles (AgNPs) and chitosan (CS)-loaded silver nanoparticles (CS-LS/AgNPs) as adsorbents for Rhodamine B (RhB). The AgNPs were synthesized by doping LS on the surface of chitosan for modification. Fourier transform infrared (FT-IR) spectrometry, energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to confirm the synthesis of nanomaterials...
March 6, 2024: Materials
https://read.qxmd.com/read/38473685/synergistic-effect-of-carbon-micro-nano-fillers-and-surface-patterning-on-the-superlubric-performance-of-3d-printed-structures
#12
JOURNAL ARTICLE
Katerina Gkougkousi, Alexandros E Karantzalis, Pantelis G Nikolakopoulos, Konstantinos G Dassios
Superlubricity, the tribological regime where the coefficient of friction between two sliding surfaces almost vanishes, is currently being investigated as a viable route towards the energy efficiency envisioned by major long-term strategies for a sustainable future. This current study provides new insights towards the development of self-lubricating systems by material and topological design, systems which tend to exhibit near-superlubric tribological performance, by reporting the synergistic effect of selective surface patterning and presence of carbon micro/nano-fillers on the frictional coefficients of additively manufactured structures...
March 6, 2024: Materials
https://read.qxmd.com/read/38473684/finite-element-analysis-and-fatigue-test-of-integra-dental-implant-system
#13
JOURNAL ARTICLE
Rafał Zieliński, Sebastian Lipa, Martyna Piechaczek, Jerzy Sowiński, Agata Kołkowska, Wojciech Simka
The study involved numerical FEA (finite element analysis) of dental implants. Based on this, fatigue tests were conducted according to the PN-EN 14801 standard required for the certification of dental products. Thanks to the research methodology developed by the authors, it was possible to conduct a thorough analysis of the impact of external and internal factors such as material, geometry, loading, and assembly of the dental system on the achieved value of fatigue strength limit in the examined object. For this purpose, FEM studies were based on identifying potential sites of fatigue crack initiation in reference to the results of the test conducted on a real model...
March 6, 2024: Materials
https://read.qxmd.com/read/38473683/biocomposites-based-on-wheat-flour-with-urea-based-eutectic-plasticizer-and-spent-coffee-grounds-preparation-physicochemical-characterization-and-study-of-their-influence-on-plant-growth
#14
JOURNAL ARTICLE
Magdalena Zdanowicz, Marta Rokosa, Magdalena Pieczykolan, Adrian Krzysztof Antosik, Katarzyna Skórczewska
In this study, we conducted the first plasticization of wheat flour (WF) with the addition of choline chloride:urea (1:5 molar ratio) eutectic mixture as a plasticizer and spent coffee grounds (cf) as a filler. Thermoplastic wheat flour (TPWF) films were obtained via twin-screw extrusion and then thermocompression. Their physicochemical characterization included mechanical tests, dynamic mechanical thermal analysis (DMTA), and sorption tests. XRD analysis revealed that the eutectic plasticizer led to a high degree of WF amorphization, which affected the physicochemical properties of TPWF...
March 6, 2024: Materials
https://read.qxmd.com/read/38473682/design-of-an-optical-device-based-on-kirigami-approach
#15
JOURNAL ARTICLE
Marta De Giorgi
The aim of this work was to design a kirigami-based metamaterial with optical properties. This idea came from the necessity of a study that can improve common camouflage techniques to yield a product that is cheap, light, and easy to manufacture and assemble. The author investigated the possibility of exploiting a rotation to achieve transparency and color changing. One of the most important examples of a kirigami structure is a geometry based on rotating squares, which is a one-degree-of-freedom mechanism...
March 6, 2024: Materials
https://read.qxmd.com/read/38473681/deformation-behavior-of-an-extruded-7075-aluminum-alloy-at-elevated-temperatures
#16
JOURNAL ARTICLE
Tuo Ye, Erli Xia, Sawei Qiu, Jie Liu, Huanyu Yue, Jian Tang, Yuanzhi Wu
Hot compression tests were conducted to explore the deformation behavior of an extruded 7075 aluminum alloy bar at elevated temperatures. Specimens with 0°, 45°, and 90° angles along the extrusion direction were prepared. The compression temperatures were 300 and 400 °C, and the strain rates ranged from 0.001 to 0.1 s-1 . The corresponding microstructures were characterized via OM and TEM, and the macroscopic texture was tested using XRD. The results indicated that the strength of the 7075 alloy decreases with higher compression temperatures and is in a proportional relationship with respect to the strain rate...
March 6, 2024: Materials
https://read.qxmd.com/read/38473680/in-situ-preparation-of-rgo-cement-using-thermal-reduction-method-and-performance-study
#17
JOURNAL ARTICLE
Jie Yao, Ao Guan, Wenqiang Ruan, Ying Ma
In this study, the combination of freeze-drying and high-temperature thermal reduction methods was employed to in situ prepare reduced graphene oxide (rGO)-Cement based on graphene oxide (GO)-Cement. The electrical conductivity and mechanical properties of the rGO-Cement were investigated. Microscopic analysis methods such as Raman spectra, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were used to confirm the successful transformation of GO-Cement to rGO-Cement. The research results demonstrated that with an increase in rGO content, the electrical resistivity of the rGO-Cement decreased first and then increased, reaching a percolation threshold at the dosage of 0...
March 6, 2024: Materials
https://read.qxmd.com/read/38473679/marble-powder-as-a-soil-stabilizer-an-experimental-investigation-of-the-geotechnical-properties-and-unconfined-compressive-strength-analysis
#18
JOURNAL ARTICLE
Ibrahim Haruna Umar, Hang Lin
Fine-grained soils present engineering challenges. Stabilization with marble powder has shown promise for improving engineering properties. Understanding the temporal evolution of Unconfined Compressive Strength (UCS) and geotechnical properties in stabilized soils could aid strength assessment. This study investigates the stabilization of fine-grained clayey soils using waste marble powder as an alternative binder. Laboratory experiments were conducted to evaluate the geotechnical properties of soil-marble powder mixtures, including Atterberg's limits, compaction characteristics, California Bearing Ratio (CBR), Indirect Tensile Strength (ITS), and Unconfined Compressive Strength (UCS)...
March 5, 2024: Materials
https://read.qxmd.com/read/38473678/a-stochastic-dynamics-method-for-time-varying-damping-depending-on-temperature-frequency-for-several-alloy-materials
#19
JOURNAL ARTICLE
Wenjun Huang, Guorui Yu, Wentao Xu, Ruchuan Zhou
In the field of aerospace and advanced equipment manufacturing, accurate response analysis has been paid more attention, requiring a more comprehensive study of the variation of mechanical parameters with the service environment. The damping variation characteristics of 304 aluminum alloy, Sa564 high-strength alloy, GW63K magnesium alloy, and Q235 steel were investigated in this paper, which plays a significant role in the dynamic responses of structures. Variable damping ratios were revealed by the damping tests based on a dynamic mechanical analysis (DMA)...
March 5, 2024: Materials
https://read.qxmd.com/read/38473677/c-60-and-cds-co-modified-nano-titanium-dioxide-for-highly-efficient-photocatalysis-and-hydrogen-production
#20
JOURNAL ARTICLE
Meifang Zhang, Xiangfei Liang, Yang Gao, Yi Liu
The inherent properties of TiO2 , including a wide band gap and restricted spectral response range, hinder its commercial application and its ability to harness only 2-3% of solar energy. To address these challenges and unlock TiO2 's full potential in photocatalysis, C60 - and CdS-co-modified nano-titanium dioxide has been adopted in this work to reduce the band gap, extend the absorption wavelength, and control photogenerated carrier recombination, thereby enhancing TiO2 's light-energy-harnessing capabilities and hydrogen evolution capacity...
March 5, 2024: Materials
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