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热改性豌豆分离蛋白与卡拉胶复合相行为及表征

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食品与发酵工业 2024年第16期50卷 85-92页

作者：陈永佳唐佳胡俊娴朱承新杨楠湖北工业大学生命科学与健康工程学院湖北武汉430068

该研究采用ζ-电位法和浊度滴定法评价了卡拉胶(carrageenan, CG)类型(κCG,ιCG,λCG)对热改性豌豆分离蛋白(heat-treated pea protein isolated, HPPI)在不同质量比(0.5∶1~6∶1)和不同pH(7.0~2.0)相行为的影响,并对不同类型复合物进... 详细信息

该研究采用ζ-电位法和浊度滴定法评价了卡拉胶(carrageenan, CG)类型(κCG,ιCG,λCG)对热改性豌豆分离蛋白(heat-treated pea protein isolated, HPPI)在不同质量比(0.5∶1~6∶1)和不同pH(7.0~2.0)相行为的影响,并对不同类型复合物进行了表征。结果表明,卡拉胶电荷密度对相变过程有显著影响,HPPI和κCG,ιCG、λCG的临界质量混合比分别是1.5∶1、3∶1、3∶1;3种卡拉胶均能抵抗HPPI的聚集,但是ιCG具有最好的抵抗效果,可归因于其独特的分子构型和硫酸盐数量,HPPI和3种卡拉胶的相图均可以分为3个相区;HPPI和ιCG以静电相互作用和氢键结合形成复合物,相比于单独的HPPI,复合物的疏水性降低,并且呈团簇和聚集态分布。该研究对于更深入了解蛋白质和多糖的相互作用以及对食品系统的设计和稳定性调控具有重要意义。

关键词：豌豆分离蛋白卡拉胶相行为相图

Nitrogen doping and graphitization tuning coupled hard carbon for superior potassium-ion storage

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Journal of Energy Chemistry 2020年第10期29卷 327-334页

作者： junxian hu Yangyang Xie Meng Yin Zhian Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

Hard carbon material is one of the most promising anode materials for potassium ion batteries(PIBs)due to its distinct disordered and non-expandable ***,the intrinsically disordered microarchitecture of hard carbon results in low electric conductivity and poor rate ***,nitrogendoped and partially graphitized hard carbons(NGHCs)derived from commercial coordination compound precursor-ethylenediaminetetraacetic acid(EDTA)disodium cobalt salt hydrate are designed and prepared as high-performance PIBs anode *** means of a facile annealing method,nitrogen elements and graphitic domains can be controllably introduced to *** resulting NGHCs show structural merits of mesoporous construction,nitrogen doping and homogeneous graphitic domains,which ensures fast kinetics and electron *** in anode for PIBs,NGHCs exhibit robust rate capability with high reversible capacity of 298.8 m Ah g^-1 at 50 m A g^-1,and stable cycle stability of 137.6 mAh g^-1 at 500 m A g^-1 after 1000 ***,the ex situ Raman spectra reveal a mixture"adsorption-intercalation mechanism"for potassium storage of *** importantly,full PIBs by pairing with perylenetetracarboxylic dianhydride(PTCDA)cathode demonstrate the promising potential of practical *** terms of commercial precursor,facile synthesis and long cycle lifespan,NGHCs represent a brilliant prospect for practical large-scale applications.

关键词： Hard carbon Nitrogen doping Graphitic domains Potassium ion batteries Adsorption-intercalation mechanism

Unveiling nanoplates-assembled Bi2MoO6 microsphere as a novel anode material for high performance potassium-ion batteries

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Nano Research 2020年第10期13卷 2650-2657页

作者： junxian hu Yangyang Xie Jingqiang Zheng Yanqing Lai Zhian Zhang School of Metallurgy and Environment Central South Universityy Changsha 410083China

Bismuth (Bi)-based electrode has aroused tremendous interest in potassium-ion batteries (PIBs) on account of its low cost, high electronic conductivity, low charge voltage and high theoretical capacity. However, the rapid capacity fading and poor lifespan induced by the normalized volume expansion (up to ~ 406%) and serious aggregation of Bi during cycling process hinder its application. Herein, bismuth molybdate (Bi2MoO6) microsphere assembled by 2D nanoplate units is successfully prepared by a facile solvothermal method and demonstrated as a promising anode for PIBs. The unique microsphere structure and the self-generated potassium molybdate (K-Mo-O species) during the electrochemical reactions can effectively suppress mechanical fracture of Bi-based anode originated from the volume variation during charge/discharge of the battery. As a result, the Bi2MoO6 microsphere without hybridizing with any other conductive carbon matrix shows superior electrochemical performance, which delivers a high reversible capacity of 121.7 mAh·g^−1 at 100 mA·g^−1 over 600 cycles. In addition, the assembled perylenetetracarboxylic dianhydride (PTCDA)//Bi2MoO6 full-cell coupled with PTCDA cathode demonstrates the potential application of Bi2MoO6 microsphere. Most importantly, the phase evolution of Bi2MoO6 microsphere during potassiation/depotassiation process is successfully deciphered by ex situ X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), and transmission electron microscopy (TEM) technologies, which reveals a combination mechanism of conversion reaction and alloying/dealloying reaction for Bi2MoO6 anode. Our findings not only open a new way to enhance the performance of Bi-based anode in PIBs, but also provide useful implications to other alloy-type anodes for secondary alkali-metal ion batteries.

关键词： Bi2MoO6 microsphere potassium ion batteries mechanism anode

Ultra-stable K metal anode enabled by oxygen-rich carbon cloth

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Nano Research 2020年第11期13卷 3137-3141页

作者： Yangyang Xie junxian hu Zexun Han Hailin Fan Jingyu Xu Yanqing Lai Zhian Zhang School of Metallurgy and Environment Central South UniversityChangsha410083China Contemporary Amperex Technology Co. Ltd.Ningde352100China

The K metal batteries are emerged as promising alternatives beyond commercialized Li-ion ***,suppressing uncontrolled dendrite is crucial to the accomplishment of K metal ***,an oxygen-rich treated carbon cloth(TCC)has been designed as the K plating host to guide K homogeneous nucleation and suppress the dendrite *** density function theory calculations and experimental results demonstrate that abundant oxygen functional groups as K-philic sites on TCC can guide K nucleation and deposition *** a result,the TCC electrode exhibits an ultra-long-life over 800 cycles at high current density of 3.0 mA·cm^(−2)for 3.0 mA·h·cm^(−2).Furthermore,the symmetrical cells can run stably for 2,000 h with low over-potential less than 20 mV at 1.0 mA·cm^(−2)for 1.0 mA·h·cm^(−2).Even at a higher current of 5.0 mA·cm^(−2),the TCC electrode can still stably cycle for 1,400 h.

关键词： K metal anode dendrite oxygen-rich treated carbon cloth K-philic sites ultra-long-life

Unraveling the morphological evolution mechanism of solid sulfur species in lithium-sulfur batteries with operando light microscopy

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Journal of Energy Chemistry 2022年第10期31卷 460-468,I0012页

作者： Jingqiang Zheng Chaohong Guan huangxu Li Yangyang Xie junxian hu Kai Zhang Bo Hong Yanqing Lai Jie Li Zhian Zhang School of Metallurgy and Environment Hunan Province Key Laboratory of Nonferrous Value-Added MetallurgyCentral South UniversityChangsha 410083HunanChina University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China Department of Chemistry City University of Hong KongKowloonHong Kong 999077China

Solid-liquid phase conversion between various sulfur species in lithium-sulfur(Li-S)batteries is a fundamental reaction of the sulfur *** the morphological evolution of solid sulfur species upon cycling is of great significance to achieving high energy ***,an in-depth investigation of the internal reaction is still *** this work,the evolution process of solid sulfur species on carbon substrates is systematically studied by using an operando light microscope combined with in situ electrochemical impedance spectra *** observation of phenomena such as bulk solid sulfur species can form and dissolve independently of the conductive substrates and the transformation of supercooled liquid sulfur to crystalline *** on the phenomena mentioned above,a possible mechanism was proposed in which the dissolution reaction of solid sulfur species is a spatially free reaction that involves isotropic physical dissolution,diffusion of molecules,and finally the electrochemical ***,the formation of solid sulfur species tends to be a form of crystallization in a saturated solution rather than electrodeposition,as is commonly *** findings offer new insights into the reaction of sulfur cathodes and provide new opportunities to design advanced sulfur cathodes for Li-S batteries.

关键词： Lithium-sulfur batteries Morphological evolution Supercooled liquid sulfur Operando light microscopy Liquid sulfur droplets

Simple-structured hydrophilic sensors for sweat uric acid detection with laser-engraved polyimide electrodes and cellulose paper substrates

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Chinese Chemical Letters 2024年第3期35卷 443-448页

作者： Linhe Xu Xueshan hu Shuang Zhou Ze Zhang junxian Zhang Chao Li Daxian Zuo Hao Liu Gang Chen Jiayu Wan Jinsong Tao State Key Lab of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Future Battery Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghai 200240China

Accurate detection of uric acid(UA)is crucial for diagnosing gout,yet traditional sweat-based UA sensors continue to face challenges posed by complex and costly electrode fabrication methods,as well as weakly hydrophilic ***,we designed and developed simple,low-cost,and hydrophilic sweat UA detection sensors constructed by carbon electrodes and cellulose paper *** carbon electrodes were made by carbonized polyimide films through a simple,one-step laser engraving *** electrodes are porous,possess a large specific surface area,and are flexible and *** substrates were composed of highly hydrophilic cellulose paper that can effectively collect,store,and transport *** constructed electrodes demonstrate high sensitivity of 0.4μA Lμmol^(-1)cm^(-2),wide linear range of 2–100μmol/*** addition,our electrodes demonstrate high selectivity,excellent reproducibility,high flexibility,and outstanding stability against mechanical bending,temperature variations,and extended storage ***,our sensors have been proven to provide reliable results when detecting UA levels in real sweat and on real human *** envision that these sensors hold enormous potential for use in the prognosis,diagnosis,and treatment of gout.

关键词： Laser-engraved carbon Polyimide Cellulose paper Hydrophilicity Sweat uric acid

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氧化剂在黄铜矿氧化浸出中应用的研究进展

过程工程学报 2017年第4期17卷 664-676页

作者：田国才胡均贤字富庭昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室云南昆明650093 昆明理工大学冶金与能源工程学院云南昆明650093 昆明理工大学理学院云南昆明650500

综述了常温常压下传统酸性介质和绿色溶剂离子液体中Fe^(3+),H_2O_2,Cr_2O_7^(2-),NaClO_3,KMnO_4,Na_2S_2O_8,O_3,NaNO_3等氧化剂在黄铜矿氧化浸出中应用的研究进展,分析总结了黄铜矿浸出过程的机理、各种浸出介质及氧化剂的优缺点.综... 详细信息

综述了常温常压下传统酸性介质和绿色溶剂离子液体中Fe^(3+),H_2O_2,Cr_2O_7^(2-),NaClO_3,KMnO_4,Na_2S_2O_8,O_3,NaNO_3等氧化剂在黄铜矿氧化浸出中应用的研究进展,分析总结了黄铜矿浸出过程的机理、各种浸出介质及氧化剂的优缺点.综合分析发现:O3的氧化电位最高、氧化性好,浸出过程中无杂质引入,是酸性介质中氧化浸出黄铜矿最好的氧化剂;酸性体系中添加极性有机溶剂可显著提高Cu的浸出率,抑制铁的浸出且有利于浸出液的净化;离子液体作为一种可设计、选择性好、易循环利用的绿色溶剂用于黄铜矿湿法冶金可显著缩短浸出时间和提高Cu的浸出率,有望开发一种黄铜矿绿色湿法冶金新技术.

关键词：黄铜矿氧化剂氧化浸出动力学硫酸介质氯介质离子液体

预见性双侧平衡去骨瓣减压术治疗重型闭合性颅脑损伤75例

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安徽医药 2016年第7期20卷 1366-1368页

作者：胡均贤黄冈市中心医院神经外科湖北黄冈438000

目的探讨预见性双侧平衡去骨瓣减压术治疗重型闭合性颅脑损伤的临床疗效,为临床治疗提供依据。方法按照随机数字表法将150例重型颅脑损伤患者分为观察组和对照组,每组75例,观察组给予预见性双侧平衡去骨瓣减压术治疗,对照组给予单侧标... 详细信息

目的探讨预见性双侧平衡去骨瓣减压术治疗重型闭合性颅脑损伤的临床疗效,为临床治疗提供依据。方法按照随机数字表法将150例重型颅脑损伤患者分为观察组和对照组,每组75例,观察组给予预见性双侧平衡去骨瓣减压术治疗,对照组给予单侧标准大骨瓣减压术治疗,比较两组治疗前后颅内压,急性脑膨出、切口疝发生率、生活质量以及并发症的发生率。结果治疗前两组颅内压比较无统计学意义(P>0.05),术后两组颅内压均显著降低,且观察组低于对照组(P<0.05);观察组急性脑膨出和术后切口疝发生率低于对照组(P<0.05);观察组生存质量高于对照组(P<0.05);观察组并发症发生率低于对照组(P<0.05)。结论预见性双侧平衡去骨瓣减压术治疗重型闭合性颅脑损伤能有效降低颅内压,提高患者生活质量,降低并发症的发生率。

关键词：头部损伤闭合性减压颅骨切除术治疗结果

不同剂量立普妥联合阿司匹林对脑梗死患者脑血流及粥样斑块的影响

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临床医学工程 2015年第11期22卷 1438-1440页

作者：胡俊贤广东省河源市人民医院神经内科广东河源517000

目的探讨不同剂量的立普妥与阿司匹林联合使用是否会对脑梗死患者的脑部血流动力学和颈动脉粥样斑块产生不同影响。方法回顾性分析2013年6月至2014年12月在我院治疗的168例脑梗死患者的临床资料,按治疗过程中服用立普妥的剂量将其分为... 详细信息

目的探讨不同剂量的立普妥与阿司匹林联合使用是否会对脑梗死患者的脑部血流动力学和颈动脉粥样斑块产生不同影响。方法回顾性分析2013年6月至2014年12月在我院治疗的168例脑梗死患者的临床资料,按治疗过程中服用立普妥的剂量将其分为低剂量组(10 mg/d)、中剂量组(20 mg/d)、高剂量组(40 mg/d)和对照组(不使用立普妥)。除立普妥外,四组患者还服用相同剂量的阿司匹林(100 mg/d)。采用经颅多普勒检测其脑动脉血流的平均流速和脉动指数;采用颈动脉超声检查检测颈动脉内中膜厚度和粥样斑块面积。结果治疗前四组患者脑动脉血流的平均流速和脉动指数之间无统计学差异(P>0.05),颈动脉内中膜厚度和粥样斑块面积亦无统计学差异(P>0.05)。治疗后服用立普妥的三组患者脑动脉血流的平均流速均显著高于对照组(P<0.05),且血液流速增加量随着立普妥服用剂量的增加而增加;治疗后服用立普妥的三组患者脑动脉脉动指数均显著低于对照组(P<0.05),且随着立普妥服用剂量的增加而降低;治疗后服用立普妥的三组患者颈动脉内中膜厚度和粥样斑块面积均显著小于对照组患者(P<0.05),且随着立普妥服用剂量的增加而减小更显著(P<0.05)。结论立普妥可有效改善脑梗死患者脑部血流动力学状态,缓解颈动脉粥样斑块,治疗效果随立普妥服用剂量的增加而显著增加。

关键词：立普妥脑梗死脑血流粥样斑块