检索结果-南通市图书馆

Green microfluidics in microchemical engineering for carbon neutrality

Chinese Journal of Chemical Engineering 2023年第1期53卷 332-345页

作者： Qingming Ma jianhong xu School of Pharmacy Qingdao UniversityQingdao 266021China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

The concept of“carbon neutrality”poses a huge challenge for chemical engineering and brings great opportunities for boosting the development of novel technologies to realize carbon offsetting and reduce carbon *** high-efficient,low-cost,energy-efficient and eco-friendly microfluidicbased microchemical engineering is of great *** kind of“green microfluidics”can reduce carbon emissions from the source of raw materials and facilitate controllable and intensified microchemical engineering processes,which represents the new power for the transformation and upgrading of chemical engineering ***,a brief review of green microfluidics for achieving carbon neutral microchemical engineering is presented,with specific discussions about the characteristics and feasibility of applying green microfluidics in realizing carbon *** of green microfluidic systems are categorized and reviewed,including the construction of microfluidic devices by bio-based substrate materials and by low carbon fabrication methods,and the use of more biocompatible and nondestructive fluidic systems such as aqueous two-phase systems(ATPSs).Moreover,low carbon applications benefit from green microfluidics are summarized,ranging from separation and purification of biomolecules,high-throughput screening of chemicals and drugs,rapid and cost-effective detections,to synthesis of fine chemicals and novel ***,challenges and perspectives for further advancing green microfluidics in microchemical engineering for carbon neutrality are proposed and discussed.

关键词： Microchemical engineering Carbon neutrality Microfluidics Aqueous two-phase systems(ATPSs) Environment Chemical processes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers

引用

Chinese Journal of Chemical Engineering 2020年第5期28卷 1368-1374页

作者： An Chen Shaowei Li jianhong xu The State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

The well understanding of interaction forces between single dispersed droplets is crucial to the understanding of emulsion stabilization ***,many studies have reported the direct quantitative measurements of interaction forces between 20-200μm single droplet coated polymers by atomic force microscope(AFM).These studies have revealed many important results about the relationship of the interaction forces and the droplet ***,these studies of the quantitative relationship between the measured interaction forces and the separation distance of the front end of the droplet have rarely been *** tweezer instrument can make it possible to establish the quantitative relationship between the measured force and the separation distance of the front end of the droplet,which will make better understanding of the interaction mechanisms between *** to the differences of the measuring mechanism between atomic force microscopy(AFM)and optical tweezers,the theory model of AFM measurements cannot be fitted with the force measurement by optical *** have made an exhaustive comparison of the measuring differences between AFM and optical tweezer instrument in this ***,we built a numerical model to derive the repulsive pressure through the measured force curve in order to quantify the measured force of two micron-sized oil droplet coated polymers by optical ***,the novel method can be extended to other micron-sized emulsion systems,and these findings will be a vital progress on quantitative force measurements between micron-sized droplets.

关键词： Emulsions Stabilization mechanism Interactions Polymers Optical tweezers

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microfluidic platform serves as controllable fabrication of binary Mo/Ir nanodots/carbon hetero-material for efficient electrocatalytic nitrogen reduction

引用

Particuology 2023年第8期79卷 1-9页

作者： Hengyuan Liu Xingjiang Wu jianhong xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

Electrocatalytic nitrogen reduction reaction(NRR)is regarded as a potential routine to achieve environment-friendly ammonia production,because of its abundant nitrogen resources,clean energy utilization and flexible ***,it is hindered by low activity and selectivity,in which con-dition well-designed catalysts are urgently in *** this work,a binary Mo/Ir nanodots/carbon(Mo/Ir/C)hetero-material is efficiently constructed via microfluidic strategy,of which the nanodots are ho-mogeneously distributed on the carbon skeleton and the average size is approximately 1 *** performance for NRR is obtained in 1 mol L^(-1) KOH,of which the optimized ammonia yield and faradic efficiency are 7.27μg h^(-1) cm^(-2) and 2.31%***,the optimized ammonia yield of 6.20μg h-1 cm-2 and faradic efficiency of 10.59%are also obtained in 0.005 mol L^(-1) H_(2)SO_(4).This work achieves the continuous-flow synthesis and controllable adjustment of hetero-materials for favorable morphologies,which provides an innovative pathway for catalyst design and further promotes the development of ammonia production field.

关键词： Binary Mo/Ir nanodots Microfluidic platform Controllable fabrication Flexible modification Electrocatalytic nitrogen reduction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A circular microreaction method to the safe and efficient synthesis of 3-methylpyridine-N-oxide

引用

Chinese Journal of Chemical Engineering 2020年第5期28卷 1320-1325页

作者： Funing Sang Jinpei Huang jianhong xu The State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

3-Methylpyridine-N-oxide is an essential intermediate in the preparation of 2-chloro-5-methylpyridine,which can be used to synthesize nicotine insecticides such as imidacloprid and *** traditional method of production of 3-methylpyridine-N-oxide is catalytic oxidation of 3-methylpyridine in semi-batch *** to strong exothermic reaction and explosive property of 3-methylpyridine,the reaction efficiency and safety is low using batch ***,the development of a safer and efficient 3-methylpyridine-N-oxide production process is very necessary in industrial *** this paper,microreaction systems were introduced into the preparation of *** comparison of three different methods(traditional semibatch method,co-current microreaction method,and circular microreaction method)showed that the circular microreaction method was the most applicable,with relative higher product yield(~90%),less side reaction and better reaction control.

关键词： Flow synthesis Hydrogen peroxide Oxidation Microreaction system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent advances in the microfluidic generation of shape-controllable hydrogel microparticles and their applications

引用

Green Chemical Engineering 2024年第1期5卷 16-30页

作者： Yingzhe Liu Zhuo Chen jianhong xu The State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

Hydrogel microparticles,generally accepted as significant green materials,have been widely used in chemical,biological,and biomedical fields owing to their excellent biocompatibility,biodegradability,and *** these,non-spherical hydrogel microparticles with diverse shape anisotropy have great potential in applications such as drug delivery,cellular interaction,micromotors,*** from their shapes,their functionalities in such fields cannot be satisfied by the typical spherical ***,microfluidics with precise control and domination of fluids at microflow sizes has emerged as a powerful method for synthesizing shape-controllable hydrogel microparticles with good monodispersity and unique *** this review,we tried to provide an overview of the production of non-spherical microparticles composed of green hydrogel materials,emphasizing the microfluidic ***,a brief introduction to their current applications is also presented.

关键词： Microfluidics Hydrogel Microparticles Non-spherical Anisotropic Green materials

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient extraction and stripping of Nd(Ⅲ),Eu(Ⅲ) and Er(Ⅲ) by membrane dispersion micro-extractors

引用

Journal of Rare Earths 2018年第8期36卷 851-856页

作者： Zhuo Chen jianhong xu Funing Sang Yundong Wang The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University

The extraction of low concentration rare earth elements at high phase ratio was investigated. The traditional extraction set-up, such as mixer-settler, have drawbacks of easy emulsification, difficult separation and low efficiency if operated at the above condition. Membrane dispersion micro-extractor,owing to its well-dispersed, high surface-to-volume ratio and fast mass transfer rate, was employed in our work. Nd（Ⅲ）,Eu（Ⅲ）,Er（Ⅲ） were chosen to represent light, medium,heavy rare earth elements（REEs）. The extraction process of REEs with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester（P507） was investigated by membrane dispersion micro-extractors. Firstly, the extraction equilibrium of these three elements was explored in the stirred conical flasks, and it is indicated that the extraction efficiencies can be 0.95, 0.97 and 0.98, respectively within 40 min at phase ratio of 100：1. Then the effects of operational conditions such as the residence time, organic and aqueous flow rates on extraction efficiency were also explored in micro-extractors. The results indicate that the efficiency decreases and then increases if increasing aqueous phase flow rate, residence time and droplets＇ diameter are the key factors of this process. Increasing the phase ratio reduces the extraction efficiency significantly. When the REEs solution has an initial pH of 4.00, the flow rates of continuous and dispersed phase are 40 and 1.6 mL/min,respectively, and 90 mg/L Nd（Ⅲ）, Eu（Ⅲ） and Er（Ⅲ） is extracted by 1 mol/L P507 at the out-let length of8 m. The extraction efficiencies are 0.978,0.983 and 0.991, respectively. Finally the stripping process was also studied with the micro-extractor. The stripping efficiencies of Nd（Ⅲ）, Eu（Ⅲ） and Er（Ⅲ） can reach0.99, 0.96 and 0.91, respectively when the out-let length is 8 m and the concentration of hydrochloric acid is 1 mol/L. The developed approach offers a novel and simple strategy on the fast extraction and enrichment of low concentration rare earth el

关键词： Rare earth elements Membrane dispersion micro-extractor Extraction Stripping

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigation of Optical Properties of Amorphous Gap Films

引用

Chinese Physics Letters 1991年第4期8卷 187-190页

作者： xu jianhong CHEN Kunji ZHU Enjun Department of Physics and Labrotory of Solid State Microstructures Nanjing UniuersityNanjing 210008 Department of Computer Science and Institute of Microelectronics Peking UniversityBeijing 100871

The optical properties of amorphous Gap(a-Gap)films prepared by plasma enhanced transport deposition method in the system of Ga-PCl_(3)-H_(2) have been *** optical energy band gap E_(g)^(opt) of a-Gap films is about 1.6 e V which depends on the contents of Cl *** results of exponential absorption edge indicate that there is a high density of band-tail states in the optical energy band gap.

关键词： amorphous exponential band

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A microextraction approach for rapid extraction and separation of Mn(Ⅱ) and Co(Ⅱ) using saponified D2EHPA system

引用

Frontiers of Chemical Science and Engineering 2022年第6期16卷 963-972页

作者： Yiwei Zhou Chen Zhuo Jinpei Huang Haipeng Liu jianhong xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

In this paper,we proposed a microextraction approach for the extraction and separation of Mn(Ⅱ)and Co(Ⅱ)from sulfate solution simulating leachate of spent lithium-ion battery cathode materials using saponified di-(2-ethylhexyl)phosphoric acid *** effects of the following operational variables were investigated:equilibrium pH,tri-«-butyl phosphate concentration,saponification rate,two-phase ratio and residence *** results showcased that the microextractor can reach the extraction equilibrium within 20 s,thereby greatly reducing necessary extraction time comparing to that of conventional *** volumetric mass transfer coefficient showed 8-21 times larger than that of batch *** the help of microextractor,95%of Mn(Ⅱ)was extracted with a single theoretical stage at a chosen two-phase ratio of 3:1,and the separation factor β_(Mn/Co) was as large as *** the subsequent stripping step,more than 99%of manganese from loaded phase was easily stripped under optimal *** microextraction approach greatly enhances the mass transfer while enabling a continuous and controllable extraction process within a simple structure *** extracting spent electrode material with microextractors,the comprehensive recovery of mangenese can reach 96%.The microextraction approach has a good applicability in the spent lithium-ion battery cathode materials recycling at both bench and industrial scales.

关键词： extraction equilibrium mass transfer coeffi-cient microextraction multicomponent extraction di-(2-ethylhexyl)phosphoric acid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microfluidic-oriented synthesis of enriched iridium nanodots/carbon architecture for robust electrocatalytic nitrogen fixation

引用

Green Energy & Environment 2024年第3期9卷 544-555页

作者： Hengyuan Liu Xingjiang Wu Yuhao Geng Xin Li jianhong xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

Electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising candidate to achieve ammonia synthesis because of clean electric energy,moderate reaction condition,safe operating process and harmless ***,the chemical inertness of nitrogen and poor activated capacity on catalyst surface usually produce low ammonia yield and faradic ***,the microfluidic technology is proposed to efficiently fabricate enriched iridium nanodots/carbon *** to in-situ co-precipitation reaction and microfluidic manipulation,the iridium nanodots/carbon nanomaterials possess small average size,uniform dispersion,high conductivity and abundant active sites,producing good proton activation and rapid electrons transmission and moderate adsorption/desorption *** a result,the as-prepared iridium nanodots/carbon nanomaterials realize large ammonia yield of 28.73 μg h^(-1) cm^(-2) and faradic efficiency of 9.14%in KOH ***,the high ammonia yield of 11.21 μg h^(-1) cm^(-2) and faradic efficiency of 24.30%are also achieved in H_(2)SO_(4) *** microfluidic method provides a reference for large-scale fabrication of nano-sized catalyst materials,which may accelerate the progress of electrocatalytic NRR in industrialization field.

关键词： Iridium nanodots Carbon Microfluidic technology Efficient synthesis Electrocatalytic nitrogen fixation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental investigation of dynamic mass transfer during droplet formation using micro-LIF in a coaxial microchannel

引用

Chinese Journal of Chemical Engineering 2021年第11期34卷 51-58页

作者： Zhuo Chen Qiqiang Xiong Shaowei Li Yundong Wang jianhong xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Collaborative Innovation Center of Advanced Nuclear Energy Technology Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China

The mass transfer of Rhodamine 6G from the droplet to the continuous phase in a coaxial micro-channel is studied using micro-LIF(Laser-Induced Fluorescence).The mass distribution inside droplet is measured and *** experimental results affirm that there exists the internal circulation inside the droplet and it could enhance the convective mass *** stagnant center of vortices is also *** extraction fraction could reach 40%80%.In order to establish the mass transfer model,different flow rates of the dispersed and continuous phase are *** high continuous phase flow rate and low dispersed phase flow rate are both beneficial to enhance mass transfer by expediting the internal circulation.A modified mass transfer model is found to calculate the extraction fraction.A good agreement between the model and experiment in various conditions demonstrates that the mass transfer model in this work is reliable and feasible.

关键词： Droplet formation Micro-LIF measurement Internal circulation Mass transfer model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：