Journal of Chemical Education最新文献_第8页

Self-Assembly of Metal–Organic Cages in Microdroplets: An Interdisciplinary Teaching Module 金属有机笼在微滴中的自组装：一个跨学科的教学模块

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-07-27 DOI: 10.1021/acs.jchemed.6c00146

Tongxia Jin, Yan Liu, Yi-Ying Guo, Wei-Tao Dou, Xuhong Qian, Hai-Bo Yang, Lin Xu

{"title":"Self-Assembly of Metal–Organic Cages in Microdroplets: An Interdisciplinary Teaching Module","authors":"Tongxia Jin, Yan Liu, Yi-Ying Guo, Wei-Tao Dou, Xuhong Qian, Hai-Bo Yang, Lin Xu","doi":"10.1021/acs.jchemed.6c00146","DOIUrl":"https://doi.org/10.1021/acs.jchemed.6c00146","url":null,"abstract":"This teaching experiment presents an interdisciplinaryplatformthat offers integrated training in organic synthesis, supramolecularassembly, microfluidics, and spectroscopic characterization by combiningsubcomponent self-assembly of metal–organic cages with droplet-basedmicrofluidic technology. A microdroplet generation system is constructedto systematically investigate droplet formation at immiscible liquidinterfaces, where controlled flow rates enable the reproducible productionof size-tunable, monodisperse oil-in-solvent droplets. The influenceof spatial confinement on supramolecular self-assembly is then examinedby comparing the formation efficiency of cage C1, assembledfrom L1, 2-formylpyridine (L2), and Zn(NTf2)2 (L3), in conventional bulk vialsand microdroplet environments. 1H NMR analysis demonstratesthat complete assembly of C1 is achieved within 60 minunder microdroplet confinement, whereas the corresponding bulk reactionremains incomplete even after 720 min. In addition, the aggregation-inducedemission (AIE) behavior of cage C1 and its ligand component L1 is systematically explored using UV–vis absorptionand fluorescence spectroscopy, elucidating the dependence of theirphotophysical properties on solvent composition. Overall, this experimenthighlights the pedagogical value of integrating micro/nanoscale confinementwith molecular self-assembly and provides an effective framework forcultivating students’ experimental skills in advanced synthesis,microfluidic manipulation, and spectral analysis.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"5876–5886"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile Synthesis and Surface Functionalization of CuInS2/ZnS (Core/Shell) Quantum Dots to Sensitize Green-to-Blue Photon Upconversion CuInS2/ZnS（核/壳）量子点的快速合成和表面功能化以敏化绿蓝光子上转换

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-09-08 DOI: 10.1021/acs.jchemed.6c00577

Francisco Yarur Villanueva, Mark W. B. Wilson, John R. De Backere

{"title":"Facile Synthesis and Surface Functionalization of CuInS2/ZnS (Core/Shell) Quantum Dots to Sensitize Green-to-Blue Photon Upconversion","authors":"Francisco Yarur Villanueva, Mark W. B. Wilson, John R. De Backere","doi":"10.1021/acs.jchemed.6c00577","DOIUrl":"https://doi.org/10.1021/acs.jchemed.6c00577","url":null,"abstract":"Quantumdots (QDs), semiconductor nanocrystals typicallya fewnanometers (nm) in size, can exhibit intriguing photophysical propertiesthat are visibly striking and engaging for undergraduate students.Here we present a laboratory experiment where undergraduate studentssynthesize CuInS2 QDs that they then shell with ZnS, yieldingbrightly emissive, Cd/Pb-free, and air-stable CuInS2/ZnScore/shell QDs. Students employ an adapted synthetic methodology thatis straightforward, reliable, and neither requires air-free techniquesnor temperatures >115 °C. Then, students use their QDs andtwocommercially available molecular fluorophores to assemble a three-componentsystem (i.e., QD sensitizer, 9-carboxylanthracene (9-ACA) “triplet-transmitter”ligands, and emissive diphenylanthracene (DPA) molecules that canperform triplet fusion) that is capable of the fascinating phenomenonof photon upconversion (UC). Specifically, students’ solutionstransform the incident green light (λ = 532 nm) from a laserinto shorter-wavelength (higher-energy) blue emission (λmax ∼ 430 nm). The blue light from UC can be observedqualitatively with the naked eye (through a short-pass optical filter)and/or quantitatively using photoluminescence (PL) spectroscopy. Pedagogicalanalyses of student work and anonymous feedback are consistent withstrong attainment of the intended learning outcomes, and suggest thatthe activity, which introduces contemporary nanochemistry, is interestingand engaging for students.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"5913–5922"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Innovative Green Chemistry: Easy and Fast Synthesis of a Universal pH Indicator from Natural Plant Extracts 创新的绿色化学：从天然植物提取物中简单快速地合成一种通用的pH指示剂

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-08-27 DOI: 10.1021/acs.jchemed.5c01778

Daniel Becker, Lars Otte, Steven Jordan Nty, Marco Beeken

{"title":"Innovative Green Chemistry: Easy and Fast Synthesis of a Universal pH Indicator from Natural Plant Extracts","authors":"Daniel Becker, Lars Otte, Steven Jordan Nty, Marco Beeken","doi":"10.1021/acs.jchemed.5c01778","DOIUrl":"https://doi.org/10.1021/acs.jchemed.5c01778","url":null,"abstract":"Plant-derived pigments represent a safe and sustainablealternativeto synthetic pH indicators, but single-plant extracts typically sufferfrom limited pH ranges and poor color differentiation. This studypresents the development and educational application of a mixed plant-baseduniversal pH indicator derived from red cabbage (Brassica oleracea) and butterfly pea (Clitoria ternatea). The combination of cyanidin- and delphinidin-based anthocyanins,obtained under mild extraction conditions, yields a smooth and continuouscolor gradient across the full pH range from 1 to 14. UV–visspectroscopy confirms that this broad responsiveness results fromcomplementary protonation equilibria and overlapping absorption profilesof the two extracts. A classroom-ready laboratory activity is describedin which students investigate the indicator, document color changes,and optionally analyze digital color values as semiquantitative pHproxies. The activity addresses key learning objectives in acid–baseequilibria, structure–property relationships, green chemistry,and data literacy. Compared with commercial universal indicators,the plant-based system shows comparable color resolution while offeringadvantages in safety, cost, sustainability, and pedagogical transparency.This mixed natural indicator therefore provides an effective and conceptuallyrich tool for teaching acid–base chemistry.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"5536–5545"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementing a Course-Specific Chatbot in Undergraduate Biochemistry 生物化学本科课程专用聊天机器人的实现

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-10-01 DOI: 10.1021/acs.jchemed.6c00129

Michael C. Marvin

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Conceptual Interpretation and Practical Teaching Design of Ideal Work and Lost Work: Comments on Chemical Engineering Thermodynamics Textbooks 理想功与失功的概念阐释与实践教学设计——对化工热力学教材的评析

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-09-17 DOI: 10.1021/acs.jchemed.6c01256

Rui Yang, Xin Yuan

{"title":"Conceptual Interpretation and Practical Teaching Design of Ideal Work and Lost Work: Comments on Chemical Engineering Thermodynamics Textbooks","authors":"Rui Yang, Xin Yuan","doi":"10.1021/acs.jchemed.6c01256","DOIUrl":"https://doi.org/10.1021/acs.jchemed.6c01256","url":null,"abstract":"Ideal work and lost work are key contents connectingthe secondlaw of thermodynamics and engineering practice, and they pose majorteaching challenges in chemical engineering thermodynamics courses.Mainstream textbooks widely use a two-step model including adiabaticreversible expansion and Carnot engine cooling to interpret idealwork, yet they ignore the intermediate reversible heat engine in description.This omission easily causes students to form misunderstandings ofcore concepts, symbols and the physical implication of the T0ΔS term. Combined with long-term frontlineteaching experience and analysis of student learning difficulties,this paper reinterprets the essence of ideal work from the perspectiveof exergy difference, supplements the infinitesimal Carnot cycle modelomitted in textbooks, and clarifies that T0ΔS is an exergy accounting correction terminstead of actual heat flow. This paper summarizes three typical inappropriateexpressions in existing textbooks and explains the nature of lostwork as energy quality degradation caused by entropy generation. Apractical four-step classroom teaching procedure, namely intuitionestablishment, physical deconstruction, formula derivation and engineeringsublimation, is put forward according to students’ cognitivecharacteristics. Quantitative evaluation data from three consecutivesemesters of teaching practice confirm that this teaching design effectivelyhelps students break through learning obstacles and improves teachingeffectiveness. The contents of this paper can serve as a practicalreference for textbook revision and daily classroom teaching for thermodynamicseducators.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"5731–5738"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemical Alcohol Oxidation: An Accessible Electrosynthesis Experiment for Sophomore-Level Organic Chemistry 电化学醇氧化：有机化学二年级易上手的电合成实验

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-09-23 DOI: 10.1021/acs.jchemed.6c00506

Luke Kays, Jose Intano, Jr., Zoe Wachtel, Victoria Russell, R. Adam Mosey, Becky Carroll, Laurie Lopez, Michelle Phillips, Melanie S. Sanford, Shelley D. Minteer

{"title":"Electrochemical Alcohol Oxidation: An Accessible Electrosynthesis Experiment for Sophomore-Level Organic Chemistry","authors":"Luke Kays, Jose Intano, Jr., Zoe Wachtel, Victoria Russell, R. Adam Mosey, Becky Carroll, Laurie Lopez, Michelle Phillips, Melanie S. Sanford, Shelley D. Minteer","doi":"10.1021/acs.jchemed.6c00506","DOIUrl":"https://doi.org/10.1021/acs.jchemed.6c00506","url":null,"abstract":"In an effort to include electrosynthesis within the organicchemistrycurriculum, we have developed an accessible undergraduate laboratoryexperiment for electrochemical alcohol oxidation for use in sophomore-levelorganic chemistry courses. The activity employs a 4-acetamido-TEMPO-catalyzedoxidation of 1-phenylethanol using an undivided cell with currentsupplied by AA batteries, eliminating the need for specialized electrochemicalinstrumentation. The experiment is conducted in aqueous buffer andcan be completed within a standard 3–4 h laboratory period.The laboratory module was implemented across three institutions witha total of 81 students, achieving an average conversion of 80%, demonstratingboth its reproducibility and adaptability in diverse instructionalsettings. Student learning was assessed through laboratory reports,instructor observation, and pre- and postlaboratory quizzes. Studentssuccessfully performed electrochemical reactions, analyzed productsusing 1H NMR spectroscopy, and determined percent conversion.Quiz results showed measurable improvement in student understandingof redox processes and electrode-specific reactions. An optional extensionincorporating substituted substrates enables exploration of structure–reactivityrelationships and identification of unknown compounds, further expandingthe pedagogical scope of the experiment. Overall, this work providesa low-cost, scalable, and adaptable framework for introducing electrosynthesisand sustainable chemical practices into the undergraduate organicchemistry laboratory curriculum.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"5596–5602"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preprocessing Matters: Visualizing the Effect of Spectral Preprocessing on Principal Component Analysis 预处理事项：可视化光谱预处理对主成分分析的影响

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-08-31 DOI: 10.1021/acs.jchemed.6c00722

María Fernanda Hernández Rodríguez, Natan Cristian Pedroso Pereira, Endler Marcel Borges

{"title":"Preprocessing Matters: Visualizing the Effect of Spectral Preprocessing on Principal Component Analysis","authors":"María Fernanda Hernández Rodríguez, Natan Cristian Pedroso Pereira, Endler Marcel Borges","doi":"10.1021/acs.jchemed.6c00722","DOIUrl":"https://doi.org/10.1021/acs.jchemed.6c00722","url":null,"abstract":"Principal component analysis (PCA) is widely used inchemistryfor the exploratory analysis of multivariate data sets; however, manylearners have difficulty understanding how spectral preprocessinginfluences PCA interpretation. This activity was developed to illustratethe effects of preprocessing on spectral profiles and PCA score plotsusing guided computational activities implemented in R. During four50 min class periods, participants compared PCA models generated fromraw spectra, Savitzky–Golay (SG) smoothing, first- and second-derivativepreprocessing, Standard Normal Variate (SNV) normalization, and combinationsof these preprocessing methods (Anal. Chem.1964, 36, 1627.). Guided questions emphasized howpreprocessing modifies spectral appearance, sample clustering, intergroupdistances, and the proportion of variance explained by the principalcomponents. An assessment using an independent Raman spectroscopydata set evaluated the transfer of these concepts to previously unseendata. Comparison of the different preprocessing strategies demonstratedthat smoothing and derivative preprocessing improved spectral discriminationby reducing baseline variation and emphasizing chemically relevantfeatures, whereas SNV normalization minimized intensity differencesamong spectra. The activities also demonstrated that preprocessingsubstantially alters the variance structure of spectral data sets,leading to changes in cluster separation and PCA interpretation. Bydirectly relating spectral transformations to multivariate results,this activity provides an accessible instructional activity for teachingspectral preprocessing and principal component analysis in analyticalchemistry, spectroscopy, and chemometrics courses.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"6135–6145"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of a Comprehensive Teaching Experiment for Synthesis, Photopatterning, and Device Application of Photo-Cross-Linkable Perovskite Nanocrystals 光交联钙钛矿纳米晶体合成、光制模及器件应用综合教学实验设计

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-09-03 DOI: 10.1021/acs.jchemed.6c00912

Jiejun Ren, Boheng Dong, Liangjun Chen, Fan Liu, Zhanhui Zhang

{"title":"Design of a Comprehensive Teaching Experiment for Synthesis, Photopatterning, and Device Application of Photo-Cross-Linkable Perovskite Nanocrystals","authors":"Jiejun Ren, Boheng Dong, Liangjun Chen, Fan Liu, Zhanhui Zhang","doi":"10.1021/acs.jchemed.6c00912","DOIUrl":"https://doi.org/10.1021/acs.jchemed.6c00912","url":null,"abstract":"Perovskitenanocrystals (NCs) have garnered widespread attentionfor their outstanding optoelectronic characteristics and versatileapplication prospects. However, the inherently soft structure anddynamically unstable surface ligands of perovskite NCs greatly limittheir processability. This work designs a facile and safe undergraduateexperiment for the controllable synthesis and photolithography ofphoto-cross-linkable perovskite NCs. Adopting a mild ambient solutionsynthesis strategy, the experiment avoids rigorous reaction conditionsand reduces teaching risks. In the experiment, students characterizethe structural and optical properties of prepared perovskite NCs,analyze the photo-cross-linking mechanism, and explore their potentialin photopatterning and light-emitting devices. This experiment integratesnanomaterial preparation, basic characterization, mechanism analysis,and photopatterning, enabling students to master the structure–property–applicationrelationship of functional materials. It effectively cultivates students’interdisciplinary experimental and analytical abilities, providinga reliable platform for integrating frontier perovskite research intoundergraduate practical teaching. It helps students understand theresearch bottlenecks of photo-cross-linkable nanomaterials and accumulatehands-on experience for their future exploration of advanced optoelectronicmaterials.","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"103 10","pages":"5995–6003"},"PeriodicalIF":3.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Attendance, Pre- and In-Class Engagement, and Pandemic-Era Exacerbated Educational Debts Influence Success in a Flipped General Chemistry I Course 出勤率、课前和课堂参与度以及大流行时代加剧的教育债务影响翻转普通化学I课程的成功

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-09-03 DOI: 10.1021/acs.jchemed.5c01210

Senetta F. Bancroft, Jennifer Koran, Lillie Sordello

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Building Community to Bridge Research and Practice: The North Carolina Chemistry Educators and Researchers (NC CER) Group 建立社区桥梁研究和实践：北卡罗来纳化学教育者和研究人员（NC CER）组

IF 3 3区教育学

Journal of Chemical Education Pub Date : 2026-10-13 Epub Date: 2026-09-20 DOI: 10.1021/acs.jchemed.6c00161

Charles T. Cox, Jr., Joi Walker, Maia Popova, Taylor Outlaw

引用次数: 0