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| 1 | Effect of molecular weight of dissolved organic matter on toxicity and bioavailability of copper to lettuce显示文摘To clarify the effects of molecular weight of dissolved organic matter (DOM) on the toxicity and bioavailability of copper (Cu) to plants,DOM extracted from chicken manure was ultra-filtered into four fractions according to their molecular weights by means of sequential-stage ultrafiltration technique.Lettuce seeds were germinated by being exposed to the solutions containing Cu 2+ with or without different fractions of DOM.The concentration of copper in roots,leaves,sprouts and the length of roots were investigated.The results showed that not all fractions of DOM could improve copper availability or toxicity.The fraction of DOM with larger molecular weight more than 1 kDa had higher complexation stability with Cu 2+ and caused lower concentration of free Cu 2+ ion in the solution of copper plus the fraction,resulting in lower availability and toxicity of copper to lettuce,but the fraction with molecular weight less than 1 kDa had the opposite function.Therefore,the molecular weight of 1 kDa may be the division point to determine DOM to increase or decrease copper availability and toxicity. | Xudong Wang,Xianni Chen,Shuai Liu,Xizu Ge College of Resource and Environment,Northwest Agriculture and Forestry University,Shaanxi 712100,China | 2010 | Journal of Environmental Sciences2010，22，12： | 8 |
| 2 | Transparent flexible thin-film p-n junction thermoelectric module显示文摘Transparent and flexible thermoelectrics has been highly sought after for future wearable devices.However,the main stumbling block to prevent its widespread adoption is the lack of p-type transparent thermoelectrics and the stringent criteria of electrical and thermal properties matching appropriately between p-legs and n-legs.This work demonstrates the fabrication of p-type PEDOT:PSS films whose optical properties,electrical conductivity,thermal conductivity,and Seebeck coefficient were engineered to perfectly match the n-type indium tin oxide(ITO)counterparts.The dense p-type PEDOT:PSS and n-type ITO thin films show a thermoelectric figure of merit of zT=0.30 and 0.29 at 450 K,and a thermal conductivity of 0.22 and 0.32 W m^(−1) K^(−1),respectively.A flexible thermoelectric generator(TEG)module with a high transmittance of>81%in the visible wavelength range of 400-800 nm is fabricated using 10 pairs of p-type PEDOT:PSS and n-type ITO thin film legs.An ultra-high power density of 22.2 W m^(−2) at a temperature gradient of 80 K was observed,which is the highest power density reported for organic/hybrid-based flexible TEGs so far.Our transparent flexible thin-film p-n junction thermoelectric module with exceptionally high power generation may take a tremendous step forward towards multi-functional wearable devices. | Xizu Wang Ady Suwardi Siew Lay Lim Fengxia Wei Jianwei Xu | 2020 | npj Flexible Electronics2020，4，1： | 2 |
| 3 | 查看详情显示文摘 | Wang Xizu Zhao Xinxin Xu Gu | | 0，，： | 1 |
| 4 | Bottom-Up Engineering Strategies for High-Performance Thermoelectric Materials显示文摘The recent advancements in thermoelectric materials are largely credited to two factors,namely established physical theories and advanced materials engineering methods.The developments in the physical theories have come a long way from the“phonon glass electron crystal”paradigm to the more recent band convergence and nanostructuring,which consequently results in drastic improvement in the thermoelectric figure of merit value.On the other hand,the progresses in materials fabrication methods and processing technologies have enabled the discovery of new physical mechanisms,hence further facilitating the emergence of high-performance thermoelectric materials.In recent years,many comprehensive review articles are focused on various aspects of thermoelectrics ranging from thermoelectric materials,physical mechanisms and materials process techniques in particular with emphasis on solid state reactions.While bottom-up approaches to obtain thermoelectric materials have widely been employed in thermoelectrics,comprehensive reviews on summarizing such methods are still rare.In this review,we will outline a variety of bottom-up strategies for preparing high-performance thermoelectric materials.In addition,state-of-art,challenges and future opportunities in this domain will be commented. | Qiang Zhu Suxi Wang Xizu Wang Ady Suwardi Ming Hui Chua Xiang Yun Debbie Soo Jianwei Xu | 2021 | Nano-Micro Letters2021，13，8： | 1 |
| 5 | Thermal and Electrical Properties of Liquid Metal Gallium During Phase Transition显示文摘Liquid metal gallium has been widely used in numerous fields, from nuclear engineering, catalysts, and energy storage to electronics owing to its remarkable thermal and electrical properties along with low viscosity and nontoxicity. Compared with high-temperature liquid metals, room-temperature liquid metals, such as gallium(Ga), are emerging as promising alternatives for fabricating advanced energy storage devices, such as phase change materials, by harvesting the advantageous properties of their liquid state maintained without external energy input. However, the thermal and electrical properties of liquid metals at the phase transition are rather poorly studied, limiting their practical applications. In this study, we reported on the physical properties of the solid–liquid phase transition of Ga using a custom-designed, solid–liquid electrical and thermal measurement system. We observed that the electrical conductivity of Ga progressively decreases with an increase in temperature. However, the Seebeck coefficient of Ga increases from 0.2 to 2.1 μV/K, and thermal conductivity from 7.6 to 33 W/(K·m). These electrical and thermal properties of Ga at solid–liquid phase transition would be useful for practical applications. | Xizu Wang Durga Venkata Maheswar Repaka Ady Suwardi Qiang Zhu Jing Wu Jianwei Xu | 2023 | Transactions of Tianjin University2023，29，3： | 0 |
| 6 | Wax from Pyrolysis of Waste Plastics as a Potential Source of Phase Change Material for Thermal Energy Storage显示文摘Over the past half-century, plastic consumption has grown rapidly due to its versatility, low cost, and unrivaled functional properties. Among the diff erent implemented strategies for recycling waste plastics, pyrolysis is deemed the most economical option. Currently, the wax obtained from the pyrolysis of waste plastics is mainly used as a feedstock to manufacture chemicals and fuels or added to asphalt for pavement construction, with no other applications of wax being reported. Herein, the thermal pyrolysis of three common waste polyolefin plastics: high-density polyethylene(HDPE), low-density polyethylene(LDPE), and polypropylene(PP), was conducted at 450 ℃. The waste plastics-derived waxes were characterized and studied for a potential new application: phase change materials(PCMs) for thermal energy storage(TES). Gas chromatography–mass spectrometry analysis showed that paraffin makes up most of the composition of HDPE and LDPE waxes, whereas PP wax contains a mixture of naphthene, isoparaffin, olefin, and paraffin. Diff erential scanning calorimetry(DSC) analysis indicated that HDPE and LDPE waxes have a peak melting temperature of 33.8 ℃ and 40.3 ℃, with a relatively high latent heat of 103.2 J/g and 88.3 J/g, respectively, whereas the PP wax was found to have almost negligible latent heat. Fourier transform infrared spectroscopy and DSC results revealed good chemical and thermal stability of HDPE and LDPE waxes after 100 cycles of thermal cycling. Performance evaluation of the waxes was also conducted using a thermal storage pad to understand their thermoregulation characteristics for TES applications. | Pin Jin Ong Zhi Xiong Jerry Heng Zhenxiang Xing Hnin Yu Yu Ko Pei Wang Hongfei Liu Rong Ji Xizu Wang Beng Hoon Tan Zibiao Li Jian Wei Xu Xian Jun Loh Enyi Ye Qiang Zhu | 2023 | Transactions of Tianjin University2023，29，3： | 0 |
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