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Effects of the properties of Mg(OH)2 precursor on the hydrothermal synthesis of magnesium oxysulfate whiskers

颗粒学报（英文版） 2024年第9期92卷 13-23页

作者： Thanayos Boonrit Mei Yang guangwen chen Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100049China Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian116023China

Magnesium oxysulfate(MOS)whiskers are commonly synthesized through a dissolution-precipitation mechanism,wherein Mg(OH)2 dissolves to form Mg(OH)64-,followed by reactions with SO4-and H2O to yield MOS ***,the impact of Mg(OH)2 precursor properties on the formation process of MOS whiskers has been insufficiently explored,and sector-like and needle-like morphologies were both observed in previous *** this study,we systematically investigated how the properties of Mg(OH)2 precursors influenced the crystalline structure and morphology of MOS *** various experimental conditions,MgSO4·5Mg(OH)2·2H2O(152MOS)whiskers were consistently ob-tained,regardless of Mg(OH)2 morphology and *** size of Mg(OH)2 emerged as a critical factor in shaping the morphology of 152MOS ***-sized Mg(OH)2(≤106±37 nm)favored the formation of sector-like whiskers,while larger-sized Mg(OH)2(≥206±98 nm)encouraged the devel-opment of needle-like *** distinction was attributed to the slower dissolution rate exhibited by larger-sized Mg(OH)2,maintaining a smaller number of 152MOS nuclei and promoting the growth of needle-like whiskers instead of the aggregation of 152MOS nuclei into sector-like *** addition,the effects of the molar ratio of Mg2+to SO4-and hydrothermal temperature were also *** average length and diameter of the needle-like whiskers prepared with Mg(OH)2 of 331±145 nm under optimized conditions were 77±32 and 0.39±0.10 μm,*** study presented an effective strategy for controlling the morphology of 152MOS whiskers.

关键词： Magnesium oxysulfate whiskers Microreactor Morphology control Precursor

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微反应器内甲苯连续二硝化制备二硝基甲苯

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化工学报 2024年第3期75卷 867-876页

作者：陈饶赵鑫陈戴欣姜圣坤廉应江王金波杨梅陈光文中国科学院大连化学物理研究所辽宁大连116023 中国科学院大学北京100049 中国五洲工程设计集团有限公司北京100053

为实现二硝基甲苯(DNT)的安全高效生产,采用微反应技术,以甲苯为原料、硝硫混酸为硝化剂,研究了甲苯连续二硝化反应过程基本规律。提高反应温度、增大硝酸与甲苯的摩尔比、降低混酸含水量、减小硝硫摩尔比、集成釜式搅拌操作有利于DNT... 详细信息

为实现二硝基甲苯(DNT)的安全高效生产,采用微反应技术,以甲苯为原料、硝硫混酸为硝化剂,研究了甲苯连续二硝化反应过程基本规律。提高反应温度、增大硝酸与甲苯的摩尔比、降低混酸含水量、减小硝硫摩尔比、集成釜式搅拌操作有利于DNT的生成;降低反应温度、提高混酸含水量和硝硫摩尔比,有利于降低2,4-/2,6-DNT比值。针对80/20DNT产品进行了硝化工艺优化。在反应温度75℃、混酸含水量14%(质量分数)、硝硫摩尔比1/4或1/3、搅拌时间5 min条件下,产物中一硝基甲苯(MNT)含量小于0.2%,2,4-和2,6-DNT含量大于96%,2,4-/2,6-DNT比值小于4.25,其他DNT异构体含量均小于4%,符合行业标准。绝热条件下,室温进料,混酸含水量14%(质量分数),硝硫摩尔比1/4,搅拌时间10min,生产的产品质量符合行业标准。研究结果为甲苯连续二硝化工艺开发及80/20DNT产品的连续制备提供了基础。

关键词：微反应器微通道过程强化硝化二硝基甲苯

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Gas-liquid-liquid slug flow and mass transfer in hydrophilic and hydrophobic microreactors

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Chinese Journal of Chemical Engineering 2022年第10期50卷 85-94页

作者： Yanyan Liu Chaoqun Yao guangwen chen Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Gas-liquid-liquid three-phase slug flow was generated in both hydrophilic and hydrophobic microreactors with double *** bubble-droplet relative movement and the local mass transfer within the continuous slug and the dispersed droplet were *** was found that bubbles moved faster than droplets under low capillary number(Ca),while droplets moved faster upon the increase of Ca due to the increased *** the first time,we observed that the increased viscosity of droplets fastened the droplet *** mass transfer in the continuous slug was dominated by convection,leading to nearly constant global mass transfer coefficient(k_(L)a);while that in the dispersed droplet was dominated by diffusion,resulting in k_(L) decreasing along the *** features are analogical to the corresponding gas-liquid or liquid-liquid two-phase slug flow,but the formation of bubble-droplet clusters caused by relative movement lowered the absolute mass transfer *** results provide insights for the precise manipulation of gas-liquid-liquid slug flow in microreactors towards process optimization.

关键词： Mass transfer Multiphase flow Slug flow Microreactor Colorimetric method

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Using expansion units to improve CO_(2) absorption for natural gas purification——A study on the hydrodynamics and mass transfer

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Chinese Journal of Chemical Engineering 2021年第1期34卷 35-46页

作者： Kai Zhu Chaoqun Yao Yanyan Liu guangwen chen Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

The usage of capillary tubes for CO_(2) absorption suffers from small re sidence time,which leads to reduced performance for large *** work presents a method of connecting expansion units to capillary tubes to serve as a residence time *** effect of the expansion unit on gas-liquid hydrodynamics,pressure drop and mass transfer coefficient(k_(L)a) are investigated under various operating pressures up to 4.0 MPa,for both physical and chemical absorption.A novel periodic jetting flow is found in the expansion unit,which can intensify the CO_(2) *** results show that the strategy can significantly decrease the pressure drop while maintaining the absorption performance to a large *** overall k_(L)a for physical and chemical absorption are correlated to pressure drop,***,CO_(2) loading in rich absorbents increases dramatically compared to literature studies with only micromixers or capillary tubes,which is bene ficial to regenerate *** study verifies the concept that pre-treatment with water can largely reduce the usage of amine s,and can also provide a guide for process design in natural gas purification such as biogas recovery.

关键词： Microchannel Microreactor Separation Purification High pressure

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Role of ultrasonic oscillation in chemical processes in microreactors:A mesoscale issue

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Particuology 2020年第1期18卷 88-99页

作者： Shuainan Zhao Chaoqun Yao Zhengya Dong guangwen chen Quan Yuan Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

The integration of microreactor and ultrasound represents an emerging area for process intensification and has attracted considerable attention in recent *** of the most important meso-scientific issues in ultrasound techniques is acoustic cavitation,which plays a vital role in the macroscopic performance of an ultrasonic *** this review,we first briefly summarize the latest research on acoustic cavitation phenomena in *** effects of channel configuration,solvent properties,and ultrasound parameters are systematically *** addition,the role of acoustic cavitation in various chemical processes(e.g.,mixing,absorption,emulsification,and particle synthesis)is presented from a mesoscale perspective,which in turn provides guidance for ultrasound applications.A thorough under-standing of the ultrasound intensification mechanism will contribute to the future development of this promising technology.

关键词： Ultrasound Microreactor Acoustic cavitation Mesoscale Process intensification

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Ultrasonic emulsification: basic characteristics, cavitation, mechanism, devices and application

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Frontiers of Chemical Science and Engineering 2022年第11期16卷 1560-1583页

作者： Chaoqun Yao Shuainan Zhao Lixue Liu Zhikai Liu guangwen chen Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of Chemical Engineering Northwest UniversityXi’an 710069China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China

Emulsion systems are widely applied in agriculture,food,cosmetic,pharmaceutical and biomedical *** has attracted much attention in emulsion preparation,especially for nanoemulsion,due to its advantages of being eco-friendly,cost-effective and *** review provides an overview for readers to the area of ultrasonic emulsification *** briefly introduces and summarizes knowledge of ultrasonic emulsification,including emulsion characteristics,acoustic cavitation,emulsification mechanism,ultrasonic devices and *** combination of microfluidics and ultrasound is highlighted with huge advantages in controlling cavitation phenomena and emulsification intensification.A novel scale of dμC^(0.6)/μD^(0.33)−EV is proposed to be able to compare the energy efficiency of emulsion preparation in different devices.

关键词： nanoemulsion ultrasound microreactor multiphase energy

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基于TLR4信号通路探讨中医药干预急性胰腺炎研究进展

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中国实验方剂学杂志 2024年第9期30卷 263-271页

作者：罗佐媚王宇青陈南韩冰洁黎丽群刘礼剑陈广文杨成宁广西中医药大学研究生学院南宁530001 广西中医药大学第一附属医院南宁530001

急性胰腺炎(AP)是临床常见的消化急腹症之一,具有起病急,发展快,病情凶险,致死率高等特点。疾病早期如果不及时进行干预,后期可向重症急性胰腺炎发展,损害长期生活质量,给患者及家属带来严重的经济负担。该病发病机制比较复杂,至今尚未... 详细信息

急性胰腺炎(AP)是临床常见的消化急腹症之一,具有起病急,发展快,病情凶险,致死率高等特点。疾病早期如果不及时进行干预,后期可向重症急性胰腺炎发展,损害长期生活质量,给患者及家属带来严重的经济负担。该病发病机制比较复杂,至今尚未被完全阐述清楚。AP的产生和发展与多种信号通路的共同参与密不可分。其中,Toll样受体4(TLR4)作为一种跨膜信号转导受体,可介导免疫应答和炎症反应,在AP发生发展中发挥关键作用。中医药可以多靶点,多效应,多给药方式等特点调控TLR4信号通路,抑制炎症反应,而有效干预AP的进展,已逐渐成为防治AP的新热潮。大量研究表明,中医药防治AP具有明显的优势,其可通过调控TLR4信号通路,加强免疫抵抗和防御,抑制炎症反应而有效治疗AP,并取得了一定的研究进展,但目前仍缺乏对中医药调控TLR4信号通路治疗AP的全面综述。故文章就近年来关于中医药调控TLR4信号通路的相关文献进行系统性梳理阐述,以期为AP的治疗及进一步的药物开发提供新的思路。

关键词：急性胰腺炎中医药 Toll样受体4(TLR4)信号通路研究进展

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Molecular systematics, population genetics and phylogeography on planarians(Platyhelminths: Turbellaria): A brief review of molecular markers

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Zoological Systematics 2019年第3期44卷 177-184页

作者： Hecai Zhang Tiange Hu Changying Shi guangwen chen College of Life Sciences Henan Normal University

Due to their characteristics, such as powerful regeneration capability, high susceptibility to xenobiotics, wide distribution and weak dispersion ability, planarians are used as ideal test animals in several research fields, and planarianology has become a more and more active subject. This paper reviews the research progress of planarians from the aspects of molecular phylogeny, molecular taxonomy, population genetics and phylogeography, and also summarizes the corresponding molecular markers applied. Moreover, the future direction and tendency in this field is briefly analyzed and prospected.

关键词： Planarian molecular marker molecular phylogeny molecular taxonomy, population genetics phylogeography

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Ultrasonic cavitation-enabled microfluidic approach toward the continuous synthesis of cesium lead halide perovskite nanocrystals

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中国化学工程学报:英文版 2023年第7期59卷 32-41页

作者： Mingzhi Li Zhikai Liu Wang Yao Chao Xu Yangping Yu Mei Yang guangwen chen Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Ligand assisted reprecipitation(LARP)is a widely used method for cesium lead halide perovskite nanocrystals(NCs)***,the ultrafast kinetics of LARP,as well as the inefficient transport properties and discontinuity of batch reactors,challenge the particle size control and experimental *** address these issues,an ultrasonic cavitation-enabled microfluidic approach was developed to achieve the continuous synthesis of cesium lead halide perovskite via *** was found that the mixing between the good solvent and antisolvent in the microchannel was greatly enhanced by intensive ultrasonic *** mixing time could be reduced to below 10 ms under the irradiation of 35 W *** modulating the mixing degree,LARP was proved to be a mixing-sensitive *** effects of ultrasonic power,ultrasonic treatment time,total flow rate,water additive,and reprecipitation temperature on the synthesis of CsPbBr_(3) NCs were systematically *** compared to CsPbBr_(3) NCs synthesized in the batch reactor,the sample synthesized via the ultrasonic cavitation-enabled microfluidic approach possessed stronger photoluminescence intensity and better ***,the ultrasonic cavitation-enabled microfluidic approach could also realize the continuous synthesis of cesium lead halide perovskite NCs with different halide compositions to cover a wide visible spectrum(426-661 nm).The ultrasonic cavitation-enabled microfluidic approach paved the way for the large-scale of high-quality cesium lead halide perovskite NCs.

关键词： Microreactor Ultrasound Mixing CsPbBr_(3)nanocrystals Synthesis

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Integrative taxonomy unveils a new species of Dugesia(Platyhelminthes,Tricladida,Dugesiidae)from the southern portion of the Taihang Mountains in northern China,with the description of its complete mitogenome and an exploratory analysis of mitochondrial gene order as a taxonomic character

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Integrative Zoology 2022年第6期17卷 1193-1214页

作者： Lei WANG Yixuan WANG Zimei DONG guangwen chen Ronald SLUYS Dezeng LIU College of Life Science Henan Normal UniversityXinxiangChina Naturalis Biodiversity Center LeidenThe Netherlands Medical College Xinxiang UniversityXinxiangChina

A new species of Dugesia(Platyhelminthes,Tricladida,Dugesiidae)from northern China is described on the basis of an integrative approach,involving morphology,karyology,histology,molecular distance,molecular phylogeny,and mitochondrial gene ***,we present the complete mitogenome of the new species Du-gesia constrictiva chen&Dong,*** new species is mainly characterized by the presence of the following features:asymmetrical openings of the oviducts;large,cuboidal copulatory bursa;vasa deferentia opening through the ventro-lateral wall of the seminal vesicle;laterally compressed seminal vesicle;ventrally displaced ejaculatory duct,opening at the blunt tip of the penis papilla;long duct intercalated between semi-nal vesicle and diaphragm;chromosome complement diploid,with 16 metacentric chromosomes;mitochondrial gene order as follows:cox1-E-nad6-nad5-S2-D-R-cox3-I-Q-K-atp6-V-nad1-W-cox2-P-nad*** triclads,mitochondrial gene order is considerably conserved between freshwater planarians and landﬂatworms,whereas it is variable between marine planarians and both fresh-water and landﬂ*** secondary structures of tRNAs are all equipped with 4 arms,excepting tRNA S1 and tRNA S2,which lack the D arm and have excessively enlarged *** transpositions of tRNA are present between *** and its *** gene arrangements may form a new,additional tool for taxonomic *** phylogenetic tree based on analysis of the mitochondrial genome basically corroborates current classiﬁcation of the higher taxa of planarianﬂatworms.

关键词： Dugesia mitochondrial genome new species taxonomy

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