Preparation of Phase Change Concrete Using Environmentally FriendlyMaterials and Its Performance Study

The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,and nature’s eco-friendly materials are selected as the porous matrix to propose an eco-friendly phase change concrete using eco-friendly materials as raw materials.It was obtained that the strength of the phase change concrete utilizing environmentally friendly materials was 25.4%to 36.8%lower than that of ordinary concrete,while some of the phase change light aggregates were found to produce slip damage with the cement paste in the damage study.By constructing a small-sized test room for thermal properties,we obtained a phase change concrete that utilizes environmentally friendly materials to control the temperature better than the commonly studied phase change concrete,with a peak temperature drop of up to 2.6℃ in the phase change test room compared to the normal test room and a delay in the peak temperature.

Numerical Simulation and Experimental Characterization of Clay Paste under Loads for Energy Saving in Clay Materials Processing

Requirements for the respect of the environment encourage to reduce the impact of human activity on the nature. Civil engineering answers these requirements by the development of ecological construction materials. This paper deals with the transformation of clay raw materials which enable the processing of environmentally friendly construction materials: in addition to their biodegradability, the alveolar fired clay materials allow energy saving in home heating thanks to their thermal isolation properties. But their manufacturing is a high energy consumption process, in particular during compaction, drying and firing which contribute to the emission of greenhouse gases. The goal of this paper is to study the rheology of clay pastes in order to develop low energy in manufacturing processes. For this purpose, theoretical and experimental approaches were carried out on six clay varieties. In the theoretical approach, a finite element (FE) simulation model has been developed for pressing a non-rigid material predicting deformations and stresses occurring within the clay structure. Experiments have then been carried out to validate the finite element modelling. In this experimental approach, the clay pastes were transformed with water content respecting the Atterberg limits which determine the plasticity of clays. The samples compaction has been carried out under variable loadings in order to determine the suitable low energy consumption loading.

Synthesis and characterization of an environmentally friendly PHBV/PEG copolymer network as a phase change material

Novel environmentally friendly poly（hydroxybutyrate-co-hydroxyvalerate） and poly（ethylene glycol） （PHBV/PEG） copolymer networks were synthesized through free-radical solution polymerization with PHBV diacrylate （PHBVDA） and polyethylene glycol diacrylate （PEGDA） as macromers. The molecular structure of PHBV/PEG copolymer network was characterized by Fourier transform infrared （FT-IR） and 1H nuclear magnetic resonance （1H NMR）. The morphology of the PHBV/PEG co- polymer network was characterized by polarization optical microscopy. Thermal energy storage properties, thermal reliability and thermal stability were investigated by differential scanning calorimetry （DSC） and thermogravimetric analysis. The results indicated that the PHBV/PEG copolymer network hindered the growth of PEG crystalline segments or PHBV segments. PHBV/PEG copolymer network had a higher latent heat enthalpy, which didn＇t reduce with the components of PHBV in- creased. Moreover, PHBV/PEG copolymer network still had good thermal stability even at 300 ~C. These results suggested that such environmentally friendly copolymer network would have wide applications in phase change energy storage materials.

一类新型绿色环保的介质材料——咪唑类离子液体

室温离子液体已成为绿色环保材料领域研究的热点之一。本文简述了咪唑类室温离子液体的制备方法,分析了结构与性能的关系,介绍了咪唑类离子作为液体绿色环保介质材料在化学反应、分离过程和电化学领域中的一些应用。

戴复古词部分交游材料补证

戴复古词中的徐似道、真德秀、吴柔胜、陈垓、赵必(巴山)、刘镕、宋自道、李华等词友的行迹及与之交游的情景,《增订注释全宋词》均因“未详”而注未详或未注,台州等地方志及其他相关文献中有程度不等、角度不一的记述。

蒋平阶生平交游钩沉

蒋平阶身处惊世巨变之时,先以云间词派代表人物出名,随后入仕抗清,终究避世隐逸。其人擅于诗词,又深谙地学,交游亦极为广博,大致可分为文学师友、抗清同仁、玄学道友等三类;如大儒陈子龙、夏允彝、姜希辙、黄宗羲,诗文名家毛奇龄、陈维崧、朱彝尊,抗清名将张煌言等人皆与其结交甚深。本文通过对各类文献的梳理分析,寻找蒋氏一生的交游往来,还原一个真实、有血有肉、个性鲜明的历史人物,展现一个不屈节求荣不献媚于世、得意时尽责为公、危急时挺身而出、失意时淡定从容的正直君子。

Synthesis, Characterisation and Photoresponsive Studies of Lignin Functionalised with 2-(5-(4-dimethylamino-benzylidin)-4-oxo-2-thioxo- thiazolidin-3-yl)-acetic Acid

A chromophoric system 2-(5-(4-dimethylamino-benzylidin)-4-oxo-2-thioxo-thiazoli din-3-yl)acetic acid with push-pull electron modulation was synthesised and incorporated onto lignin core (technical lignin, lignin sulphonic acid M.W. 52,400) and the photo responsive behaviour was investigated. The product was characterised by UV-visible, fluores-cence, FT-IR, and NMR spectroscopic methods. The results of the studies show that the incorporation of the chromo-phoric system on to the lignin core enhanced the light absorption and light stabilization properties of the chromophoric system. The remarkable stability on irradiation provides a novel photo responsive system with excellent light fastening properties which would find application in coating materials, dyes, paints etc.

Design strategies of high-performance lead-free electroceramics for energy storage applications

A greater number of compact and reliable electrostatic capacitors are in demand due to the Internet of Things boom and rapidly growing complex and integrated electronic systems,continuously promoting the development of high-energy-density ceramic-based capacitors.Although significant successes have been achieved in obtaining high energy densities in lead-based ferroelectric ceramics,the utilization of lead-containing ceramies has been restricted due to environmental and health hazards of lead.Lead-free ferroelectric ceramics have garnered tremendous attention and are expected to replace lead-based ceramics in the near future.However,the energy density of lead-free ceramics is still lagging behind that of lead-containing cou.nterparts,severely limiting their applications.Significant efforts have been made to enhance the energy storage performance of lead-free ceramics using multi-scale design strategies,and exciting progress has been achieved in the past decade.This review briefly discusses the energy storage mechanism and fundamental characteristics of a dielectric capacitor,summarizes and compares the state-of-the-art design strategies for high-energy-density lead-free ceramics,and highlights several critical issues and requirements for industrial production.The prospects and challenges of lead-free ceramics for energy storage applications are also discussed.

Li-ion charge storage performance of wood-derived carbon fibers@MnO as a battery anode

Wood-derived carbons have been demonstrated to have large specific capacities as the anode materials of lithium-ion batteries(LIBs). However, these carbons generally show low tap density and minor volumetric capacity because of high specific surface area and pore volume. Combination with metal oxide is one of the expected methods to alleviate the obstacles of wood-derived carbons. In this work, the composites of Mn O loaded wood-derived carbon fibers(CF@Mn O) were prepared via a simple and environmentally friendly method, showing decreased specific surface area due to the generation of Mn O nanoparticles on carbon fibers. Furthermore, the CF@Mn O compostites exhibit superior electrochemical performance as anode materials of LIBs, which show high reversible capacity in the range of 529-734 m Ah/g at a current density of 100 m A/g. The optimal CF@Mn O product(Mn O:carbon = 1:2) delivers reversible capacity of 734 and 265.3 m Ah/g at current density of 100 and 2000 m A/g, respectively. Besides, the material presents outstanding stability with coulombic efficiency around 100% after 200 cycles at a high current density of 400 m A/g, revealing a potential as promising anode materials for high-performance LIBs.