bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of bio‐resource‐derived graphene oxide on the mechanical and thermal properties of poly(vinyl alcohol) nanocomposites
Authors: Arya Tanuja , Bohra Bhashkar Singh , Tewari Chetna , Dhali Sunil , Dikshit Vishwesh , Rana Sravendra , Jung Yong Chae , Sahoo Nanda Gopal 
Published: October 2023

AbstractThe present study reports on an environment‐friendly and economically viable method of synthesizing graphene oxide (GO) using agricultural waste, specifically oak (Quercus ilex) fruit. The agricultural waste‐derived GO (AGO) is further used as a reinforcing filler in the fabrication of poly(vinyl alcohol) (PVA) polymer nanocomposites by employing a solution‐mixing process. A series of characterization methods have been used to assess the interactions between AGO and PVA, including, Raman spectroscopy, FT‐IR, field emission scanning electron microscopy (FESEM), and energy‐dispersive x‐ray (EDX). The thermal and structural properties have been studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA)analysis, and a universal testing machine (UTM). The strong H‐bonding interaction between the PVA interface and AGO considerably enhanced interfacial dispersion and adhesion. As a result, the addition of 5 wt% AGO to the PVA polymers significantly improved their mechanical and thermal properties, including tensile strength which rose by 117%, melting temperature (Tm) by 7.02°C, and crystallization temperature (Tc) by 9.06°C. The thermal decomposition temperatures such as T5%, T10% and T50% were increased by 53.68°C, 68.49°C, and 57.37°C, respectively. The results show that a small loading of nanofillers causes substantial increases in the thermal and mechanical properties of PVA, thus making it a promising material for structural applications.
Effect of alumina content on the thermal, mechanical and tribological properties of resin‐based friction materials
Authors: Wang Zhengyun , Ling Junhua , Luan Daocheng , Zhan Libei , Hu Zhihua , Sun Wei , Zhao Xiao 
Published: October 2023

AbstractTo investigate the effect of alumina on the thermal, mechanical, and tribological properties of resin‐based friction materials, five friction materials with different alumina contents were prepared by the hot press molding process. The experimental results showed denser friction materials possessed higher hardness, while compressive strength and compression modulus dropped as alumina decreased. Friction material with 6 wt% alumina exhibited outstanding impact strength and great heat resistance. It also showed excellent friction stability, with a maximum mean coefficient of friction (COF) steady between 0.408 and 0.425 at various braking speeds. The wear resistance of friction materials had a positive relationship with the stability of the COF, and the greater the stability of the COF, the better the wear resistance and the lower the corresponding wear rate. The morphology of the worn surface indicated multiple sources of friction at different braking speeds, and large areas of dense friction films were beneficial to stabilizing the COF and reducing the wear rate.Highlights
The sample with 6 wt% alumina showed excellent heat resistance, with a residual value of 83.5% at 800°C.
The highest compressive strength and compression modulus were achieved in the sample with 8 wt% alumina.
The sample containing 6 wt% alumina exhibited the highest COF and the lowest wear rate.
The maximum subsurface temperature of the friction materials basically rose as braking speed increased.
Large areas of dense friction films were beneficial to stabilizing the COF and reducing the wear rate.
Effect of different microcapsule types on the wear mechanism of PTFE/aramid fiber composite liners
Authors: Yan Xiaocui , Pang Shifa , Qi Xiaowen , Lu Gaifen , Dong Yu , Liu Changxin , Fan Bingli 
Published: October 2023

AbstractIn this study, three different methods based on vacuum adsorption, solvent volatilization, and Pickering emulsion were utilized to prepare microcapsules with the core material of PAO40 and the wall materials of SiO2, polysulfone (PSF), and PSF/SiO2 composites, respectively. PTFE/Kevlar fabric liners were modified by PAO40/SiO2 microcapsules (PSMS), PAO40/PSF microcapsules (PPMS), and PAO40/PSF/SiO2 microcapsules (PPSMS). The effect of microcapsules based on different wall materials on the tribological properties of liners was investigated by friction and wear tester under low‐speed and heavy‐load conditions. The anti‐friction and anti‐wear mechanisms of several microcapsule types on the liners were systematically investigated. The results showed that PPMS induced the most significant enhancement in anti‐friction properties of liners when compared to pure liner resulting in a 19.4% reduction in coefficient of friction (COF). PSMS was found to reveal much better wear resistance of liners, as evidenced by 75% increase in wear rate. PSMS and PPSMS not only release lubricating oil after the break of microcapsules under the friction action to lubricate, but also generate a cavity to store abrasive debris for liner wear reduction. Nonetheless, PPMS only released the oil onto the friction surfaces for lubrication. PSF as the microcapsule wall material could not contribute to the formation and promote wear resistance of transfer films. SiO2 as a microcapsule wall material participates in the formation and enhances the wear resistance of transfer films. The findings obtained are anticipated to improve the reliability and broaden the range of applications of liners in aerospace and other industrial fields.Highlights
Three microcapsules all improve the tribological properties of the liners.
Anti‐friction and wear‐resisting mechanism of three microcapsules in liners.
SiO2 as wall material can increase the wear resistance of transfer films.
PAO40 in microcapsules has antifriction effect at the friction interface.
Study on the anchoring performance and failure mechanism of basalt/glass hybrid fiber reinforced plastic anchors in coupled environment
Authors: Ren Yuhang , Wang Hongguang , Wu Gang , Guan Zhongzhi , Yuan Long 
Published: October 2023

AbstractTo investigate the real anchorage performance of basalt and glass hybrid fiber reinforced plastic (FRP) anchors in external corrosive environments. In this paper, a combination of experimental studies and finite element analysis was used. By carrying out pull‐out tests of basalt and glass hybrid FRP anchors under the synergistic effect of freeze–thaw cycles and alkaline environment, the effects of factors such as hole diameter, anchorage length, and mortar strength on their anchorage performance and durability were investigated. Critical corrosion time was introduced to determine the degree of corrosion of the anchor rods. After that, it combined with numerical simulation to reveal the degradation mechanism of the anchorage performance of hybrid anchors. The results showed that the best anchorage performance of basalt/glass hybrid FRP anchors was achieved when the hole diameter was 24 mm, the anchorage length was 175 mm, and the mortar strength was 45.5 MPa. The ultimate pull‐out load was up to 122.16 kN. When the time did not exceed the critical corrosion time, the ultimate load‐carrying capacity of basalt and glass hybrid FRP anchors increased by 9.3% compared to the uncorroded environment. Beyond the critical corrosion time, the ultimate load‐carrying capacity was reduced by 23.3% and the anchorage performance was degraded. In addition, the contact interface between the anchor and the mortar is the weak area of the anchoring structure, which should be focused on in the later design of the actual project.Highlights
Basalt/glass hybrid FRP anchors have good corrosion resistance.
The anchoring performance of hybrid FRP anchors under the coupled environment is studied.
Hole diameter and anchoring length have more influence on the anchor performance.
The concept of critical corrosion time is put forward.
The failure mechanism and coupling environment influence are revealed by FES.
Carbon fiber in situ grown ZIF‐67 nanocrystals with excellent electrochemical and interfacial property
Authors: Pu Guohong , Yang Aoshuang , Li Yongsheng , Jiang Zhuoni , Li Xiaoan , Chen Zhengguo , He Ren , Zhang Kai , Yang Wenbin 
Published: October 2023

AbstractCarbon fiber(CF) reinforced flexible composites had a wide range of applications. However, the interfacial adhesion of composites was weak as a result of the smooth and chemically inert CF surface. To settle this issue, this paper described a method to enhance the specific surface area, roughness and wettability of the CF surface by in situ growing Cobalt‐based zeolitic imidazolate framework (ZIF‐67) nanocrystals and CF reinforced waterborne polyurethane (WPU) composites were prepared by a simple casting method. Scanning electron microscopy clearly revealed uniformly grown ZIF‐67 nanoarrays with distinct morphology on the CF surface. As a result, the CF@ZIF‐3 electrode exhibited excellent electrochemical property, with specific capacitance reaching 368.2 mF/cm2. The reinforcing effect of ZIF‐67 with different morphology was further verified through transverse fiber bundle tension test and shear bonding strength measurements, showing improvements of 51.9 and 72.1% respectively, in comparison to the CF/WPU composites due to the unique structure of the ZIF‐67 nanocrystals acted as buffer area, effectively relieving stress concentration and altering the direction of crack propagation. As a result, the interfacial properties of the composites were enhanced. Moreover, tensile and tear strengths of CF@ZIF/WPU composites showed remarkable improvement compared to CF/WPU composites. This study presented a potential reinforcement strategy for achieving high‐performance CF/WPU composites.Highlights
ZIF‐67 with different morphologies were grown in situ on the CF surface.
CF@ZIF electrode exhibited excellent electrochemical property.
ZIF‐67 interface layer improved interfacial properties of composites.
The tensile strength of the composites improved after ZIF‐67 modification.
Introduction of ZIF‐67 enhanced the tear strength of composites.
Comparative metabolomics study on areca nut from China and Southeast Asia (Thailand and Indonesia)
Authors: Zhang Xiaojuan , Sun Yuanyuan , Qi Huasha , Feng Jian , Hou Wencheng , Liu Yangyang 
Published: October 2023

AbstractIntroductionAreca nut is an economic crop and an important component in traditional Chinese medicine (TCM) and ethnomedicine. The crop is rich in alkaloids and flavonoids. Most previous studies have focused on the chemical components, especially alkaloids, in crops from certain areca nut‐producing areas.ObjectiveThe purpose of this study was to compare the differences in areca nut seeds in two main cultivation areas, identify differential metabolites, and evaluate seed quality in different production areas.MethodsA widely targeted metabolomics method based on ultrahigh‐performance liquid chromatography coupled with triple quadrupole mass spectrometry (UHPLC‐QQQ‐MS), combined with the TCM systems pharmacology (TCMSP) database and multivariate statistical analysis, was used in this study to maximise the differentiation between quality characteristics of areca nut seeds from China and Southeast Asian regions.ResultsAltogether, 1031 metabolites were identified in areca nut seeds; by querying the TCMSP database, 375 metabolites were identified as the main active ingredients. Moreover, the research showed that the metabolic profiles of areca nut seeds from China (ASCN) and Southeast Asia (ASSA) exhibit significant differences, and the difference is mainly reflected in 318 compounds. The relative content of 146 metabolites in ASCN was significantly higher than that in ASSA. Through Kyoto Encyclopedia of Genes and Genomes (KEGG) comparative analysis, areca nut seed metabolites in Chinese production areas were determined to have a wider metabolic pathway.ConclusionThe areca nut seeds from cultivation areas possess many metabolites that are beneficial for health, including alkaloids, amino acids, phenolic acids, and lipids. Thus, compared with ASSA, ASCN have a higher medicinal value. This study provides a direction for the subsequent development and utilisation of areca nut seeds.
Mechanical enhancement of epoxidized natural rubber by flue gas desulfurization ash as the sole reinforcing filler
Authors: Wei Junwen , Zhuang Wei , Lin Tengfei , Gao Min , Zhao Chunlin , Wu Xiao , Lin Cong , Chen Hong , Su Qingfa 
Published: October 2023

AbstractFlue gas desulfurization facilities produce flue gas desulfurization ash (FGDA), which has ecological and economic benefits. In this article, we explored the possibility and impact of using FGDA as the sole reinforcing filler to mechanically improve epoxidized natural rubber (ENR). The influence on the properties of the composites was examined. FGDA exhibits good interfacial interaction and compatibility with ENR, which improves the mechanical properties of ENR. When 15 phr FGDA was added, the tensile strength of the composites increased by approximately 41.4% compared with that of pure ENR. This work demonstrates the possibility of using FGDA as an effective and sole reinforcing material to enhance the properties of rubber materials.Highlights
FGDA improves the mechanical properties of ENR as a sole reinforcing filler.
FGDA reacts with ENR during vulcanization, enhancing compatibility.
Adding 15 phr FGDA to ENR increases the tensile strength by 41.4%.
Linear low‐density polyethylene modified with d‐limonene/β‐cyclodextrin inclusion complex: Antimicrobial composite for active food packaging
Authors: Dobrzyńska‐Mizera Monika , Knitter Monika , Piss Marlena , Szymanowska Daria , Mallardo Salvatore , Santagata Gabriella , Di Lorenzo Maria Laura 
Published: October 2023

AbstractLinear low‐density polyethylene (PE) containing an inclusion complex composed of β‐cyclodextrin and d‐limonene (CD‐lim) is proposed as an innovative food wrapping material with antimicrobial features. PE/CD‐lim composites are prepared by conventional, high‐volume processing, and the optical and mechanical properties of the developed formulations appear suitable for their use as food packaging materials. Compared to plain PE, the PE/CD‐lim films have improved haze and UV–vis outcomes, but also decreased gloss values. Addition of CD‐lim slightly increases water uptake, up to levels suitable for the foreseen application. It also allows to improve performance of PE as food packaging material, since the PE/CD‐lim composites provide barrier to ultraviolet light, an added value for packaging of fatty acids‐containing food items, whose shelf life is often limited by oxidation caused by UV light. Most importantly, PE/CD‐lim composites exhibit significant antimicrobial properties against a wide range of microorganisms, including fungi and bacteria. Hence, PE films containing CD‐lim display suitable properties to play a role as active food packaging films.Highlights
Development of polyethylene‐based composites containing a natural filler
Composite films with enhanced antimicrobial and antifungal efficiency
Improved transparency to visible light and barrier to UV of the composites
Single‐molecule fluorescence microscopy for imaging chemical reactions: Recent progress and future opportunities for advancing polymer systems
Authors: Dunn Carmen B. , Valdez Sara , Qiang Zhe 
Published: October 2023

AbstractSingle‐molecule fluorescence (smFL) imaging techniques have evolved greatly over the past two decades to encompass the ability to monitor chemical reactions, providing unique advantages of non‐invasive sample preparation and characterization, labeling specificity, and high spatial and temporal resolutions. This work summarizes the recent progress in this important area by first providing a brief overview of different smFL techniques, including their common optical setups and working principles. We then introduce recent developments of smFL to characterize various model chemical reaction systems, such as biochemical synthesis, catalyzed systems, and nanomaterial assembly. Furthermore, several representative areas of using smFL to understand polymer reactions are discussed, including understanding interfacial phenomenon and polymerization kinetics, as well as characterizing electrochemical reactions. We also highlight the outlook of this exciting field and potential opportunities for further development and application of smFL to enable advances in polymer chemistry and physics.
Plasma surface modification and three‐dimensional structuring of additively manufactured polyetheretherketone implants for improvement of osseointegration
Authors: Strauss Lea , Bruyas Arnaud , Gonzalez Raul , Pappas Daphne , Ben Salem Dhia , Krampe Erhard , Schmitt‐John Thomas , Leonhardt Stefan 
Published: October 2023

AbstractOsseointegration is highly desirable for implants used for bone replacement. Polyetheretherketone (PEEK) is an attractive material due to its characteristics such as high biocompatibility and Young's modulus similar to human bones. However, PEEK is bioinert, meaning cells do not adhere and proliferate on its surface. This problem is addressed in this study, with the goal of enhancing osseointegration of additively manufactured PEEK. The influences of surface modifications and porous structures on cellular behavior were assessed by wettability and in vitro tests with subclone of the human osteosarcoma cell line‐2 osteoblasts. Overall, the combination of surface modification, type of plasma process used, atmospheric pressure versus vacuum‐based, and surface structuring, especially gyroid structures, improve the cellular proliferation on PEEK. Therefore, its ability to enhance osseointegration is highly promising.
Dual Stimuli‐Responsive Ternary Core‐Shell Polystyrene@Pnipam‐Pedot Latexes
Authors: Vretik Lyudmyla O. , Noskov Yuriy V. , Chepurna Oksana M. , Ogurtsov Nikolay A. , Nikolaeva Olena A. , Marynin Andrii I. , Ohulchanskyy Tymish Y. , Pud Alexander A. 
Published: October 2023

AbstractThe ability of stimuli‐responsive materials to respond to external stimuli depends on their intra‐ and intermolecular interactions, which, in turn, are governed by changes in the material composition. Here, the importance of these factors for new heat and light‐sensitive latexes of core‐shell nanoparticles is reported with the polystyrene core, the poly(N‐isopropylacrylamide) (PNIPAM) shell containing doped poly(3,4‐ethylenedioxythiophene) (PEDOT). It is found that hydrogen bonding, C═O─π aromatic, hydrophilic‐hydrophobic interactions in the shell cause conformational changes in PNIPAM similar to those occurring in the PNIPAM coil‐globule transition. Depending on the EDOT:PS@PNIPAM feed ratio and the PEDOT content in PNIPAM shells, these interactions and changes affect nanoparticle sizes and are responsible for shifting the lower critical solution temperature (LCST) of PNIPAM in the shell from 32.1 to 33.9 °C. The core‐shell morphology of nanoparticles is maintained only for latexes with EDOT feed to ≈9 wt.%. At the higher EDOT content, PNIPAM shells are destroyed. Synthesized PS@PNIPAM‐PEDOT latexes demonstrate temperature‐dependent behavior and produce a photothermal effect under NIR irradiation, which allows for a rise of their temperature above LCST. This dual stimuli (heat and light) responsiveness suggests an important possibility for these latexes to be used for drug or diagnostic agent delivery.
Establishing the prognostic profile of patients with work‐related musculoskeletal disorders: Development and acceptability of the MAPS questionnaire
Authors: Tousignant‐Laflamme Yannick , Houle Catherine , Longtin Christian , Desmarais Nathalie , Gérard Thomas , Perreault Kadija , Lagueux Emilie , Tétreault Pascal , Blanchette Marc‐André , Beaudry Hélène , Décary Simon 
Published: October 2023

AbstractPurposeWork‐related musculoskeletal disorders (WRMD) are the most common causes of disability worldwide and are associated with significant use of healthcare. One way to optimize the clinical outcomes of injured workers receiving rehabilitation is to identify and address individual prognostic factors (PF), which can facilitate the personalization of the treatment plan. As there is no pragmatic and systematic method to collect prognostic‐related data, the purpose of the study was to develop and assess the acceptability of a set of questionnaires to establish the “prognostic profile” of workers with WRMD.MethodsWe utilized a multistep process to inform the acceptability of the Measures Associated to PrognoStic (MAPS) questionnaire. During STEP‐1, a preliminary version of the was developed through a literature search followed by an expert consensus including a patient‐advisor. During STEP‐2, future users (rehabilitation professionals, healthcare administrators and compensation officers) were consulted through an online survey and were asked to rate the relevance of each content item; items that obtained ≥80% of “totally agree” answers were included. They were also asked to prioritize PF according to their usefulness for clinical decision‐making, as well as perceived efficacy to enhance the treatment plan.ResultsThe questionnaire was developed with three categories: the outcome predicted, the unique PF, and prognostic tools. Personal PF (i.e.: coping strategies, fear‐avoidance beliefs), pain related PF (i.e.: pain intensity/severity, duration of pain), and work‐related PF (i.e.: work physical demands, work accommodations) were identified to be totally relevant and included in the questionnaire. 84% of the respondents agreed that their patients could complete the MAPS questionnaire in their clinical setting, while 75% totally agreed that the questionnaire is useful to personalize rehabilitation interventions.ConclusionThe MAPS questionnaire was deemed acceptable to establish the “prognostic profile” of injured workers and help the clinicians in the treatment decision‐making process.
Can Charged Stars be Singularity‐Free?
Authors: Hansraj Sudan , Hansraj Chevarra , Errehymy Abdelghani , Moodly Lushen 
Published: October 2023

AbstractWhile the configuration of a static spherically symmetric distribution of perfect fluid in an electric field has received extensive attention in the literature, only a few works have investigated the conformally flat case. The model exhibits a remarkable property being regular or singularity free is proposed. This is unexpected given that Coulombic repulsion opposes the collapse of a star to the center generally making the center unreachable. The conformally flat geometry thus enables the approach to the center of a charged star as shown in our model. Presently there is no known reported exact model that satisfies all the elementary requirements for physical acceptability. Some reported models that have claimed to be physically reliable have been shown to be deficient. The conditions for the existence of physically relevant models and show that exact solutions satisfying the conditions exist is investigated. Then a model satisfying all the requirements with isotropic particle pressure graphically for a carefully chosen parameter space is exhibited. The model admits a barotropic equation of state. The interior spacetime is successfully matched to the exterior Reissner‐Nordstrom metric. The causality criterion as well as the adiabatic stability lower bound of Chandrasekar are shown to hold. The energy conditions are also valid within the stellar radius. Other interesting models are considered.