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Ruyuan Yang¹, Chaokun Hong², Xiaofeng Zhang¹, Quan Yuan³, Youfu Sun^1,*
Journal of Renewable Materials, Vol.8, No.2, pp. 113-132, 2020, DOI:10.32604/jrm.2020.08190 - 01 February 2020
（This article belongs to the Special Issue: Bio-composite Materials and Structures)
Abstract In order to enhance the bearing capacity of structural components, save materials, and reduce cost, a glued laminated timber (glulam) I-beam that is theoretically suitable for engineering application was proposed. In this study, 18 glulam specimens were fabricated using larch dimension lumber and resorcinol– formaldehyde resin. Four-point bending tests were carried out to compare the ultimate bearing capacity, strain, and deflection of various specimens. The results showed that: (1) The typical failure mode at bending is the web shear failure parallel to grain. Before the failure, cracks and sounds appear at the beam web, which… More >

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Xianglong Lu¹, Tianshui Yu¹, Hailing Wang¹, Ruichun Luo², Pan Liu², Songliu Yuan¹, Lihua Qian^1,*
Journal of Renewable Materials, Vol.8, No.2, pp. 133-151, 2020, DOI:10.32604/jrm.2020.08650 - 01 February 2020
Abstract Hydrogen evolution reaction (HER) in neutral medium suffers from slow kinetics as compared to that in alkaline or acidic conditions, owing to larger Ohmic loss and low proton concentration. Here we report that a self-supported nanoporous Au-SnO_x (NP Au-SnO_x) catalyst with gradient tin oxide surface could significantly enhance HER activity in neutral buffer solution (0.2 M PBS). The NP Au-SnO_x catalyst exhibits a low onset overpotential of 38 mV and a small Tafel slope of 79 mV dec⁻¹ . The current density of 10 mA cm⁻² is manifested at an overpotential as low as 148 mV, representing the More >

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Lei Tian, Liuchao Qiu^*, Jingjun Li, Yongsen Yang
Journal of Renewable Materials, Vol.8, No.2, pp. 154-170, 2020, DOI:10.32604/jrm.2020.08701 - 01 February 2020
（This article belongs to the Special Issue: Renewable materials for sustainable development)
Abstract In recent decades, the utilization of waste tires, plastic and artificial shale ceramsite as alternative fine aggregate to make self-compacting concrete (SCC) has been recognized as an eco-friendly and sustainable method to manufacture renewable construction materials. In this study, three kinds of recycled aggregates: recycled tire rubber particles, wood-plastic particles, artificial shale ceramsite were used to replace the sand by different volume (5%, 10%, 20% and 30%), and their effects on the fresh and hardened properties of SCC were investigated. The slump flow and V-funnel tests were conducted to evaluate the fresh properties of modified-SCC… More >

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Ahmed Abdel-Azeem^1,*, Amr A. Nada^2,3, Anthonia O’Donovan⁴, Vijay Kumar Thakur⁵, Amr Elkelish⁶
Journal of Renewable Materials, Vol.8, No.2, pp. 171-185, 2020, DOI:10.32604/jrm.2020.08960 - 01 February 2020
（This article belongs to the Special Issue: Polymer and Nanomaterials)
Abstract There is an increasing interest in developing nanoparticles with diverse biologic activities. To this end, we prepared 10 to 15 nm silver nanoparticles (AgNP) from native isolates of Trichoderma atroviride. Within this study, endophytic fungi hosted four medicinal plants in Saint Katherine Protectorate, South Sinai, Egypt have been isolated by surface sterilization technique on four isolation media. Ten species, based on their frequency of occurrence, out of twenty recovered taxa were tested for their capability to synthesize extracellular AgNPs. Trichoderma atroviride hosted Chiliadenus montanus was found to be the best candidate for the production of mycogenic AgNPs among… More >

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Brody A. Frost, E. Johan Foster^*
Journal of Renewable Materials, Vol.8, No.2, pp. 187-203, 2020, DOI:10.32604/jrm.2020.07940 - 01 February 2020
（This article belongs to the Special Issue: Renewable Polymer Materials and Their Application)
Abstract As the world's population exponentially grows, so does the need for the production of food, with cereal production growing annually from an estimated 1.0 billion to 2.5 billion tons within the last few decades. This rapid growth in food production results in an ever increasing amount of agricultural wastes, of which already occupies nearly 50% of the total landfill area. For example, is the billions of dry tons of cellulose-containing spent coffee grounds disposed in landfills annually. This paper seeks to provide a method for isolating cellulose nanocrystals (CNCs) from spent coffee grounds, in order… More >

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Refat Hassan^1,*, Hideo Takagi², Samia Ibrahim³
Journal of Renewable Materials, Vol.8, No.2, pp. 205-218, 2020, DOI:10.32604/jrm.2020.08530 - 01 February 2020
（This article belongs to the Special Issue: Polymer and Nanomaterials)
Abstract A spectrophotometric investigation of oxidation of chondroitin-4-sulfate (CS) as a sustainable and biodegradable sulfated macromolecule by oxyanion permanganate ion as multi-equivalent oxidant in acid perchlorate solutions at a constant ionic strength of 2.0 mol dm^-3 has been studied. The experimental results on the influence of the concentration of the reactants the reaction rates revealed first-order dependence in MnO₄^– , fractional second-order in [CS] and fractional first-order with respect to the hydrogen ion concentration. The hydrogen acid concentration dependence of the rate constants indicated that the oxidation rates were increased with increasing the acid concentration which means… More >

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