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Self-assembly of colloidal nanoparticles into encapsulated hollow superstructures

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Aggregate 2022年第1期3卷 188-196页

作者： chaolumen wu Zhiwei Li Yaocai Bai Dung To Nosang V.Myung Yadong Yin Department of Chemistry University of CaliforniaRiversideCaliforniaUSA Department of Chemical and Biomolecular Engineering University of Notre DameNotre DameIndianaUSA

As a distinct type of nanocapsules,hollow superstructures of inorganic nanoparticles have attracted increasing attention due to their controllable permeability,convenient functionalization,and efficient surface utilization.Conventionally,they are produced by assembling nanoparticles against expensive sacrificial templates.Herein,a general emulsion-based method is reported to assemble colloidal nanoparticles into submicron hollow superstructures,involving first co-assembly of colloidal nanoparticles with organic additives to form clusters,then overcoating the clusters with a polymer shell,and finally removing the organic additives and re-dispersing nanoparticles by exposing to a good solvent.The key to the success of this process is the re-assembly of nanoparticles against the polymer shells as driven by the capillary force during solvent evaporation,producing hollow superstructures.Such a space-confined assembly process can be well controlled by choice of solvents and their evaporation rates.This general technique provides an open and low-cost platform for creating hollow superstructures of various inorganic nanoparticles,offering many opportunities for exploring unique applications that can take advantage of the collective properties of the constituent nanoparticles and the permeable nanoshell structures.

关键词： emulsion hollow superstructures nanoparticles space-confined assembly

Ethylene sulfite based electrolyte for non-aqueous lithium oxygen batteries

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Chinese Chemical Letters 2016年第9期27卷 1485-1489页

作者： chaolumen wu Chen-Bo Liao Lei Li Jun Yang School of Chemistry and Chemical Engineering Shanghai Key Lab of Electrical Insulation and Thermal AgingShanghai Jiao Tong University Shanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical EngineeringShanghai jiao Tong University

Non-aqueous lithium-oxygen （Li-O2） batteries have been considered as the superior energy storage system due to their high-energy density, however, some challenges limit the practical application of Li- O2 batteries. One of them is the lack of stable electrolyte. In this communication, a novel electrolyte with ethylene sulfite （ES） used as solvent for Li-O2 batteries was reported. ES solvent showed low volatility and high electrochemical stability. Without a catalyst in the air-electrode of Li-O2 batteries, the batteries showed high specific capacity, good round-trip efficiency and cycling stability.

关键词： Lithium-oxygen batteries Electrolyte Ethylene sulfite Cycling stability Electrochemical stability

Chloromethyl pivalate based electrolyte for non-aqueous lithium oxygen batteries

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Chinese Chemical Letters 2017年第11期28卷 2155-2158页

作者： Taoran Li chaolumen wu Huanhuan Yuan Lei Li Jun Yang School of Chemistry and Chemical Engineering Shanghai Key Lab of Electrical Insulation and Thermal Aging Shanghai Jiao Tong University Shanghai 200240 China Shanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China

A novel electrolyte with chloromethyl pivalate （CP） used as solvent was first reported for non-aqueous lithium-oxygen （Li-O2） batteries. Since there are no α-H atoms in the structure of CP, the CP based electrolyte in both superoxide radical solution and real LifO2 battery environment showed good chemical stability against superoxide radicals, which was confirmed by ^1H NMR and ^13C NMR measurements. Without a catalyst in the cathode of Li-O2 batteries, the batteries showed high specific capacity and cycling stability.

关键词： Li-O2 battery Chemical stability Chloromethyl pivalate Electrolyte

Emulsion‐templated synthesis of 3D evaporators for efficient solar steam generation

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SmartMat 2023年第2期4卷 69-77页

作者： Jinxing Chen Michael Lee Yinghua Qiu chaolumen wu Bo Li Yadong Yin Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices Joint International Research Laboratory of Carbon‐Based Functional Materials and DevicesInstitute of Functional Nano and Soft Materials(FUNSOM)Soochow UniversitySuzhouJiangsuChina Department of Chemistry University of CaliforniaRiversideCaliforniaUSA

Interfacial solar steam generation holds great promise in water desalination thanks to its high energy efficiency by heating only the top layer of water for evaporation.While three‐dimensional(3D)evaporators have been proven to increase the evaporation rate by harnessing the energy from the surroundings,further development is still required in terms of convenient fabrication with potential scalability.Herein,we propose to overcome this challenge by using a high internal phase emulsion(HIPE)to template the synthesis of 3D hierarchically porous evaporators.The HIPE‐templated synthesis combined with a molding process can efficiently fabricate the desired 3D shape without wasting any materials and generate a hierarchically porous internal structure for continuous water supply.Engineering the overall shape and internal pores produces a 3D evaporator that can suppress conduction heat loss and efficiently collect thermal energy from its surroundings,boosting the evaporation rate to 2.82 kg/(m2 h)under 1‐sun illumination,which is significantly higher than conventional 2D evaporators.HIPE‐templating synthesis is an easy but effective way to produce various porous polymers,promising for a wide range of applications where easy production,excellent shape control,and potential scalability are critical.

关键词： 3D evaporator high internal phase emulsion photothermal conversion solar steam generation templating synthesis

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荞麦氮、磷、钾肥的效应研究

作物杂志 2014年第6期 95-98页

作者：刘迎春乌朝鲁门李永娟丁素荣李峰赤峰市农牧科学研究院内蒙古赤峰024031 内蒙古经济作物工作站内蒙古呼和浩特010010

2011~2012年,采用3414肥料效应设计方案,研究了不同氮磷钾肥配比对赤峰地区荞麦品种赤荞1号产量的影响。结果表明,在一定范围内,赤峰地区氮、磷、钾肥的施用量对赤荞1号的增产作用是磷肥大于钾肥,而氮肥表现为减产。建议赤峰地区荞麦磷... 详细信息

2011~2012年,采用3414肥料效应设计方案,研究了不同氮磷钾肥配比对赤峰地区荞麦品种赤荞1号产量的影响。结果表明,在一定范围内,赤峰地区氮、磷、钾肥的施用量对赤荞1号的增产作用是磷肥大于钾肥,而氮肥表现为减产。建议赤峰地区荞麦磷、钾肥施用量分别为P2O522.87~24.06 kg/hm^2、K2O 9.75~53.92 kg/hm^2,应适量施用磷肥,增施钾肥,不推荐施用氮肥。

关键词：荞麦 3414 氮磷钾施肥量

负载纳米钯颗粒在邻位导向磺化反应中的催化特性探究

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有机化学 2020年第7期40卷 1991-1998页

作者：李鹏帅乌云白朝鲁门包永胜内蒙古师范大学化学与环境科学学院内蒙古绿色催化重点实验室呼和浩特010022

报道了一种负载钯纳米颗粒催化2-苯基吡啶与芳磺酰氯的邻位导向磺化反应.对反应前后的负载钯纳米颗粒催化剂进行X射线光电子能谱(XPS)分析,发现反应后钯完全被氧化.结果证明钯催化的邻位导向磺化反应是经由PdII/IV催化循环,而不是Pd0/I... 详细信息

报道了一种负载钯纳米颗粒催化2-苯基吡啶与芳磺酰氯的邻位导向磺化反应.对反应前后的负载钯纳米颗粒催化剂进行X射线光电子能谱(XPS)分析,发现反应后钯完全被氧化.结果证明钯催化的邻位导向磺化反应是经由PdII/IV催化循环,而不是Pd0/II催化循环.热过滤实验及其催化剂的表征进一步证明了这个假设,提供了在邻位导向磺化反应中确定钯价态变化的直接方法.

关键词： C—H功能化钯纳米颗粒催化剂磺化 XPS分析