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  • Open Access

    ARTICLE

    Evaluation of Novel Chitosan Based Composites Coating on Wettability for Pure Titanium Implants

    Qahtan A. Hamad1, Hanaa A. Al-Kaisy1, Mohanad N. Al-Shroofy1, Noor K. Faheed2,*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1601-1612, 2023, DOI:10.32604/jrm.2023.023213

    Abstract This work aims to prepare chitosan (CS)-based coated layers, CS (10 wt% nanosilver/90 wt% CS, 10 wt% biotin/90 wt% CS, and 5 wt% nanosilver–5 wt% biotin)/90 wt% CS coatings are prepared, onto pure Ti substrate. The surface morphology of the novel CS composite coating was studied using field emission scanning electron microscopy, atomic force microscopy (AFM), Fourier transforms infrared (FTIR) and wettability test. Results show that the addition of (biotin, nanosilver) 5 Vol.% improves the properties of composite materials. Using different particles’ scale size aid in improving the combinations in the alginate, producing a dual effect on film properties. Coating… More > Graphic Abstract

    Evaluation of Novel Chitosan Based Composites Coating on Wettability for Pure Titanium Implants

  • Open Access

    ARTICLE

    Effect of Polypropylene Fiber on the Unconfined Compressive Strength of Loess with Different Water Content

    Wankui Ni1, Jiaxin Zhong1,2, Haiman Wang1,*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1699-1814, 2023, DOI:10.32604/jrm.2022.023805

    Abstract Fiber-reinforced soils have been of great interest to experimenters for building foundations’strength performance, time, and economy. This paper investigates the effects of water content and polypropylene fiber dosage and length on loess’s unconfined compressive strength (UCS) according to the central composite response surface design test procedure. The water content is 11%–25%, the mass ratio of fiber to soil is 0.1%–0.9%, and the fiber length ranges from 6–18 mm. The response surface method (RSM) developed full quadratic models of different variables with response values. After analysis of variance (ANOVA), the mathematical model developed in this study was statistically significant (p ≤… More > Graphic Abstract

    Effect of Polypropylene Fiber on the Unconfined Compressive Strength of Loess with Different Water Content

  • Open Access

    ARTICLE

    N-Doped rGO-Like Carbon Prepared from Coconut Shell: Structure and Specific Capacitance

    Imam Khambali1,2,*, Budhi Priyanto1,2, Retno Asih1, Malik Anjelh Baqiya1, Muhammad Mahyiddin Ramli3, Nurul Huda Osman4, Sarayut Tunmee5, Hideki Nakajima5, Triwikantoro1, Mochamad Zainuri1, Darminto1,*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1823-1833, 2023, DOI:10.32604/jrm.2023.025026

    Abstract An rGO−like carbon compound has been synthesized from biomass, i.e., old coconut shell, by a carbonization process followed by heating at 400°C for 5 h. The nitrogen doping was achieved by adding the urea (CH4N2O) and stirring at 70°C for 14 h. The morphology and structure of the rGO-like carbon were investigated by electron microscopies and Raman spectroscopy. The presence of C-N functional groups was analyzed by Fourier transform infrared and synchrotron X-ray photoemission spectroscopy, while the particle and the specific capacitance were measured by particle sizer and cyclic voltammetry. The highest specific capacitance of 72.78 F/g is achieved by… More > Graphic Abstract

    N-Doped rGO-Like Carbon Prepared from Coconut Shell: Structure and Specific Capacitance

  • Open Access

    REVIEW

    Thermomechanical Energy Converters for Harvesting Thermal Energy: A Review

    Oleg P. Dimitriev*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1555-1600, 2023, DOI:10.32604/jrm.2023.024772

    Abstract Thermal energy, i.e., the electromagnetic energy in the infrared range that originates from the direct solar radiation, outgoing terrestrial radiation, waste heat from combustion of fuels, heat-emitting electrical devices, decay of radioactive isotopes, organic putrefaction and fermentation, human body heat, and so on, constitutes a huge energy flux circulating on the earth surface. However, most energy converters designed for the conversion of electromagnetic energy into electricity, such as photovoltaic cells, are mainly focused on using a narrow part of the solar energy lying in the visible spectrum, while thermomechanical engines that are fueled by heat in the broad energy range… More > Graphic Abstract

    Thermomechanical Energy Converters for Harvesting Thermal Energy: A Review

  • Open Access

    ARTICLE

    Durability of Green Concrete in Severe Environment

    Yonggan Yang1,2,3,4, Zihao Kang1, Binggen Zhan1,3,*, Peng Gao1,3,*, Qijun Yu1, Yanlai Xiong4, Jingfeng Wang1,3, Yunsheng Zhang5

    Journal of Renewable Materials, Vol.11, No.4, pp. 1895-1910, 2023, DOI:10.32604/jrm.2023.025059

    Abstract In this paper, the effects of different mineral admixtures and sulfate solution types on the appearance, mass change rate, relative dynamic elastic modulus, and corrosion resistance coefficient of concrete were systematically studied. X-ray Diffraction (XRD), Mercury Intrusion Porosimetry (MIP), Scanning Electron Microscopy (SEM), and X-ray Computed Tomography (X-CT) were used to explore and analyze the changes in the microstructure and the corrosion products of concrete in the sulfate solution. The results show that the existence of magnesium ions accelerates concrete deterioration. There is a critical dosage of fly ash for magnesium sulfate resistance of concrete. The magnesium sulfate resistance of… More > Graphic Abstract

    Durability of Green Concrete in Severe Environment

  • Open Access

    ARTICLE

    Mechanical and Permeability Analysis and Optimization of Recycled Aggregate Pervious Concrete Based on Response Surface Method

    Fan Li1,#, Xin Cai2,#, Yanan Zhang1,*, Xingwen Guo2,*, Minmin Jiang3

    Journal of Renewable Materials, Vol.11, No.4, pp. 1745-1762, 2023, DOI:10.32604/jrm.2022.024380

    Abstract In this paper, the effects of different influencing factors and factor interaction on the compressive strength and permeability of recycled aggregate pervious concrete (RAPC) were studied based on the response surface method (RSM). By selecting the maximum aggregate size, water cement ratio and target porosity as design variables, combined with laboratory tests and numerical analysis, the influences of three factors on the compressive strength and permeability coefficient of RAPC were revealed. The regression equation of compressive strength and permeability coefficient of recycled aggregate pervious concrete were established based on RSM, and the response surface model was optimized to determine the… More >

  • Open Access

    ARTICLE

    Fabricating Cationic Lignin Hydrogels for Dye Adsorption

    Chao Wang, Xuezhen Feng, Wanbing Li, Shibin Shang*, Haibo Zhang*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1793-1805, 2023, DOI:10.32604/jrm.2023.024521

    Abstract Due to the low content of adsorption-active groups in lignin, its application in the field of adsorption is limited. Herein, we first prepared cationic kraft lignin acrylate, from which a cationic lignin (CKLA) hydrogel was further prepared by cationic kraft lignin acrylate, acrylamide, and N, N’-methylenebisacrylamide. The morphology, compression properties and swelling properties of CKLA hydrogels were investigated. The prepared CKLA hydrogel was applied as an adsorbent for Congo red. The effect of CKLA hydrogel dosages, initial concentration of Congo red, and pH on adsorption efficiency was investigated. The maximum Congo red removal efficiency was obtained at the initial concentration… More >

  • Open Access

    ARTICLE

    Analytical Investigation into the Rotational Performance of Glulam Bolted Beam-Column Connections under Coupled Bending Moment and Shear Force

    Xiaofeng Zhang1, Lisheng Luo2,*, Youfu Sun1, Xinyue Cui2, Yongqiang Zhang2

    Journal of Renewable Materials, Vol.11, No.4, pp. 2033-2054, 2023, DOI:10.32604/jrm.2022.023651

    Abstract Considering the glulam beam-column connection form and the number of bolts, monotonic loading test and finite element analysis was carried out on 9 connection specimens in 3 groups to study the rotational performance and failure mode of the connection. The test results revealed that compared with U-shaped connectors, T-shaped connectors can effectively improve the ductility of connections, and the increase in the number of bolts can reduce the initial stiffness and ductility of connections. By theoretical analysis, formulas for calculating the initial stiffness and ultimate moment of connections were deduced. Subsequently, the moment-rotation theoretical model of connections was established based… More > Graphic Abstract

    Analytical Investigation into the Rotational Performance of Glulam Bolted Beam-Column Connections under Coupled Bending Moment and Shear Force

  • Open Access

    ARTICLE

    Green Hydrothermal Synthesis and Applications of Sorbus pohuashanensis/Aronia melanocarpa Extracts Functionalized-Au/Ag/AuAg Nanoparticles

    Jin Huang1,2,#, Jixiang Sun1,3,4,#, Kai Shao1,3,4, Yamei Lin1,3,4, Zhiguo Liu1,3,4,*, Yujie Fu1, Liqiang Mu2,*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1807-1821, 2023, DOI:10.32604/jrm.2023.023721

    Abstract Nanoparticles (NPs) have already been widely used in catalysis, antibacterial and coating fields. Compared with the traditional toxic and harmful reducing reagents, green synthesis of NPs by using plant extracts is not only environmental-friendly and cost-effective but also conducive to the multi-level and efficient utilization of wild plant resources. In this study, the aqueous extracts from Sorbus pohuashanensis (SP) and Aronia melanocarpa (AM) fruits were used as the reducing and protective reagents for synthesizing Au/AgNPs, with the characteristics of originality operation and high repeatability. The SP/AM fruit extracts functionalized Au/AgNPs were characterized by UV-vis spectroscopy (UV-vis), transmission electron microscopy (TEM),… More > Graphic Abstract

    Green Hydrothermal Synthesis and Applications of <i>Sorbus pohuashanensis</i>/<i>Aronia melanocarpa</i> Extracts Functionalized-Au/Ag/AuAg Nanoparticles

  • Open Access

    EDITORIAL

    Bio-Based Halogen-Free Flame Retardant Polymeric Materials

    Xin Wang*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1627-1629, 2023, DOI:10.32604/jrm.2023.027379

    Abstract This article has no abstract. More >

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