ACS Applied Engineering Materials最新文献

{"title":"Eco-Friendly UV-Assisted Growth of Silver Nanoparticles on the Zirconium Metal–Organic Framework: 3D-Surface-Enhanced Raman Scattering Platform for Rhodamine 6G Sensing in Water","authors":"Sushma Yadav,&nbsp;Niranjan Haridas Menon,&nbsp;Choice Landvik,&nbsp;Sreerag Kaaliveetil,&nbsp;Najamuddin Naveed Khaja,&nbsp;Priti Malhotra and Sagnik Basuray*,&nbsp;","doi":"10.1021/acsaenm.4c0071110.1021/acsaenm.4c00711","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00711https://doi.org/10.1021/acsaenm.4c00711","url":null,"abstract":"<p >Owing to rapid response, nondestructiveness, and high sensitivity, surface-enhanced Raman scattering (SERS) has been extensively utilized in diverse applications. However, synthesizing an eco-friendly SERS substrate with a high surface area and sensitivity is still challenging in the myriad of SERS synthetic worlds. Herein, we fabricate Ag/NH₂–UiO-66 and Ag/UiO-66 nanocomposites (NCs) via an environmentally friendly and hazardous chemical-free approach, i.e., UV-assisted synthesis (λ ∼ 352 nm) using UiO-66 or NH₂–UiO-66 and AgNO₃ as a stabilizing precursor for the synthesis of Ag. The morphological and structural characterizations were done using different spectroscopy tools. The SERS sensing capability of both substrates was compared using R6G in aqueous media. The Ag/UiO-66 NCs have lower detection capability compared to the amine-functionalized Ag/NH₂–UiO-66, which showed excellent linearity over the range of 10^–3 M to 10^–8 M for R6G in water with a good enhancement factor of 3.1 × 10⁵. The UV-assisted synthesis of SERS further encourages researchers to fabricate environmentally friendly 3D-SERS substrates for sensing diverse emerging contaminants to maintain environmental sustainability.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 2","pages":"392–400 392–400"},"PeriodicalIF":0.0,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural Stabilization and Redox Reactions Involving Structural Phase Transformation of Calcium Ferrite Oxygen Carriers in Chemical Looping Combustion","authors":"Takayuki Kosaka,&nbsp; and ,&nbsp;Junichiro Otomo*,&nbsp;","doi":"10.1021/acsaenm.4c0072810.1021/acsaenm.4c00728","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00728https://doi.org/10.1021/acsaenm.4c00728","url":null,"abstract":"<p >Chemical looping combustion has the potential to reduce the energy penalty associated with carbon dioxide (CO₂) separation during the combustion of hydrocarbon fuels. Calcium ferrite oxygen carriers are promising for practical applications due to their ability to be synthesized from inexpensive and eco-friendly materials. In this study, the calcium ferrite oxygen carrier achieved complete combustion and exhibited high stability while effectively controlling its structural phase transformation. The structural phase transformations were influenced by the molar ratio of Fe/(Ca + Fe) and the oxygen partial pressure of the reducing gas, which determined the extent of the reduction reaction. Thermogravimetric measurements of the cyclic redox reaction were conducted under two conditions: (a) lower <i>p</i>(O₂) conditions using H₂ as the reducing gas and (b) higher <i>p</i>(O₂) conditions using humidified methane (CH₄) as the reducing gas. Under lower <i>p</i>(O₂) conditions, Ca and Fe were clearly separated after the reduction reaction, indicating the formation of Fe domains. The diameter of the Fe domains depended on the Ca ratio, with Ca suppressing the growth of these domains, which may contribute to maintaining redox reactivity. Under higher <i>p</i>(O₂) conditions, the microstructural changes were also dependent on the Ca ratio. The microstructure of Fe₂O₃/CaFe₂O₄ remained dynamically stable, although Fe₂O₃ exhibited the formation of large hollows. The migration of Fe ions during the structural phase transformation likely controlled the microstructural changes. Product gas analysis using a fluidized bed reactor revealed complete combustion of humidified CH₄ in the presence of CaFe₂O₄, Fe₂O₃, or both. At an optimal static bed height, the CO₂ yield reached 100%. These results indicate that Fe₂O₃/CaFe₂O₄ is a promising oxygen carrier and offer valuable insights into the development of high-performance oxygen carriers utilizing structural phase transformations.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 2","pages":"401–409 401–409"},"PeriodicalIF":0.0,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optically Addressable Light Valve Based on a GaN:Mn Photoconductor","authors":"Bikramjit Chatterjee,&nbsp;Soroush Ghandiparsi,&nbsp;Miranda S. Gottlieb,&nbsp;Erin Clark,&nbsp;Kathy Jackson,&nbsp;Clint D. Frye,&nbsp;Ryan D. Muir,&nbsp;Brandon W. Buckley,&nbsp;Colin Harthcock,&nbsp;Joel B. Varley,&nbsp;Sara E. Harrison,&nbsp;Qinghui Shao and Lars F. Voss*,&nbsp;","doi":"10.1021/acsaenm.4c0066410.1021/acsaenm.4c00664","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00664https://doi.org/10.1021/acsaenm.4c00664","url":null,"abstract":"<p >Semi-insulating manganese-doped gallium nitride (GaN:Mn) layers epitaxially grown on unintentionally doped GaN substrates were used as photoconductors in optically addressable light valves (OALVs) to withstand higher operational laser fluences compared to current state-of-the-art OALVs where bismuth silicon oxide (BSO; Bi₁₂SiO₂₀) layers are used as photoconductors. GaN:Mn promises to be an exciting material for optoelectronic operations due to its large laser fluence handling capability and photoresponsivity near the band edge. The laser damage thresholds for the semi-insulating epitaxial GaN:Mn layer and the n-type substrate layer were measured to be 2.4 and 4.2 J/cm², respectively. These are 6–10 times higher than that of BSO (0.4 J/cm²). These measurements were performed by exposing ∼200 sites on the samples to increasing fluence levels from a Gaussian pulsed Nd:YAG laser system (1064 nm) operating at a 5 Hz repetition rate with a 3 ns pulse width. Photoresponsivity of the GaN:Mn material was investigated at discrete wavelengths of 447, 405, and 380 nm. The peak photoresponsivity was observed under an illumination wavelength of 380 nm and is attributed to stronger absorption. The OALV was fabricated by attaching a 110-μm-thick GaN:Mn layer grown on a 280-μm-thick n-GaN layer to a 3-mm-thick BK7 optical window. A twisted nematic E7 liquid crystal was introduced to the 5 μm gap between the two components. Transmission levels of &gt;90% were achieved for the fabricated OALVs for a peak voltage of 40 V, constrained by transmission “bleed-through”.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 2","pages":"325–336 325–336"},"PeriodicalIF":0.0,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iridium Improves BOR Selectivity of Ru-Based Catalysts for Direct Borohydride Fuel Cells","authors":"Lin Kang,&nbsp;Yexuan Zhang,&nbsp;Cheng Liu,&nbsp;Jinyu Ye,&nbsp;Liangyao Xue,&nbsp;Jiaqi Zhang,&nbsp;Lirong Zheng,&nbsp;Youyong Li,&nbsp;Wen Guo and Bo Zhang*,&nbsp;","doi":"10.1021/acsaenm.4c0076310.1021/acsaenm.4c00763","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00763https://doi.org/10.1021/acsaenm.4c00763","url":null,"abstract":"<p >Direct borohydride fuel cells (DBFCs) are considered as a promising energy storage method because of their high theoretical cell voltage and high energy density. However, the sluggish kinetics and low fuel utilization have limited its practical application. According to density functional theory calculations, we found that the high-valency ruthenium (Ru) site not only promotes electrochemical borohydride oxidation reaction (eBOR) kinetics but also tends to catalyze hydrolysis. Doping iridium (Ir) species into a Ru-based catalyst effectively inhibits hydrolysis and improves eBOR selectivity. Herein, a catalyst of Ru-Ir supported on carbon powder (RuIrO_<i>x</i>-C) was prepared by a sol–gel method. The RuIrO_<i>x</i>-C catalyst achieves a remarkable power density of 236 mW cm^–2, which is 47% higher than that of the control RuO_<i>x</i>-C catalyst. Additionally, DBFCs show excellent stability and can work continuously for 210 h at a current density of 100 mA cm^–2. In situ attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIRS) indicated that the high-valence Ru site accelerates the eBOR kinetics, while reducing the adsorption of water molecules on the catalyst surface. This reduction inhibits the hydrolysis reaction and improves the reaction selectivity. This work opens a way for the design and development of eBOR catalysts with excellent activity, stability, and selectivity.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 2","pages":"444–453 444–453"},"PeriodicalIF":0.0,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemo-Photothermal Therapy on Breast Cancer Cells in a 3D Coculture Hydrogel Model with In Situ Embedded Polydopamine Nanoparticle","authors":"Moslem Sadeghi,&nbsp;Farzaneh Falahi,&nbsp;Shiva Akbari-Birgani,&nbsp;Aziz Maleki and Nasser Nikfarjam*,&nbsp;","doi":"10.1021/acsaenm.4c0070310.1021/acsaenm.4c00703","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00703https://doi.org/10.1021/acsaenm.4c00703","url":null,"abstract":"<p >Breast cancer is one of the most common cancers in the world. Surgery is the preferred treatment for this cancer, but the risk of local recurrence and metastasis of the remaining cells after surgery is still a significant concern. A coculture 3D model based on dopamine-grafted alginate (Alg-DA) containing different polydopamine nanoparticles (PDA NPs) is presented in this work for breast cancer cell therapy. The PDA NPs were grown <i>in situ</i> in the hydrogels to fabricate ADHG-PDAN-<i>x</i> hydrogels, in which <i>x</i> indicates the PDA NP content. The human breast cancer line of MDA-MB-231 and primary human foreskin fibroblast cells (HFF) were cocultured in the hydrogels to closely resemble the <i>in vivo</i> breast tumor microenvironment. The coculture 3D hydrogel models were treated by applying an anticancer drug, docetaxel (chemotherapy), near-infrared (NIR) irradiation using a laser with an 808 nm wavelength with a power of 1 W/cm² (photothermal therapy), and a combination of both methods (chemo-photothermal therapy). The results unveiled an increased effect of chemo-photothermal therapy on the 67.4% eradication of cancerous cells, while only chemotherapy and photothermal therapy showed 48.4% and 57.8% eradication rates, respectively. This therapeutic method can potentially prevent the growth of tumor cells and can be used after surgery to eliminate residual cancer cells.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 2","pages":"368–378 368–378"},"PeriodicalIF":0.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailoring the Coffee Ring Effect by Chemically Active Janus Colloids","authors":"Karnika Singh,&nbsp;Pawan Kumar,&nbsp;Harishwar Raman,&nbsp;Hrithik Sharma and Rahul Mangal*,&nbsp;","doi":"10.1021/acsaenm.4c0078510.1021/acsaenm.4c00785","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00785https://doi.org/10.1021/acsaenm.4c00785","url":null,"abstract":"<p >The coffee ring effect (CRE), which results from the evaporation of sessile droplets containing colloids, is critical to processes such as inkjet printing, microfabrication, and biomedical diagnostics. This study investigates the CRE dynamics of droplets containing a mixture of passive and chemically active Janus particles that exhibit self-propelled activity via self-diffusiophoresis/self-electrophoresis. Our experiments demonstrate that depending on the fraction of active colloids, their activity influences the capillary flow and interfacial interactions, leading to significant alterations in both the peripheral growth and the central accumulation of colloids. Droplets containing solely active particles produce loose peripheral networks and a “coffee-eye” pattern in the center. The scaling of growth fluctuations reveals a shift from diffusion-like aggregation to the Kardar–Parisi–Zhang (KPZ) universality class. This work enhances our understanding of the CRE phenomenon and opens avenues for advancing fundamental knowledge in colloidal science and expanding the applications of particle deposition techniques.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 1","pages":"275–285 275–285"},"PeriodicalIF":0.0,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143088491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iron Single-Atom Catalyst Actuates PMS/O3 Activation Process: Nonradical Generation Path for Synergistic Multiperoxides","authors":"Shuhan Fu,&nbsp;Zhenyang Xu,&nbsp;Hanlin Yang,&nbsp;Yaqian Pang,&nbsp;Yuhui Wang,&nbsp;Yixiao Zou,&nbsp;Shangyi Li,&nbsp;Yong Xiao*,&nbsp;Yong Lu and Tingting Zhang*,&nbsp;","doi":"10.1021/acsaenm.4c0071310.1021/acsaenm.4c00713","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00713https://doi.org/10.1021/acsaenm.4c00713","url":null,"abstract":"<p >Singlet oxygen (¹O₂) is an excellent reactive oxygen species in advanced oxidation processes for water purification due to its excellent environmental suitability and selectivity. However, its generation and conversion mechanisms remain unclear. Herein, we have constructed a high-yield system for ¹O₂ by introducing ozone (O₃) into an iron single-atom catalyst/peroxymonosulfate (PMS) system. The steady-state concentration of ¹O₂ in the system was increased by 53.2% at O₃ concentration below 0.5 mg/L. The formation of ¹O₂ from high-valent iron-oxo species (Fe^IV═O) was revealed by electron paramagnetic resonance analysis, where Fe^IV═O was found by probe experiment via the activation of PMS on iron single-atom sites. The developed in situ singlet oxygen fluorescence imaging technique observed that the addition of O₃ has promoted the conversion process of Fe^IV═O to ¹O₂. Density functional theory calculations further demonstrated the low energy barrier for the formation of the key intermediate OO* in this process. These findings help to further understand the mechanism of ¹O₂ production at the molecular level and guide the design of efficient advanced oxidation reaction systems for water purification.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 1","pages":"202–213 202–213"},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143088058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stable Operation of Copper-Protected La(FeMnSi)13Hy Regenerators in a Magnetic Cooling Unit","authors":"Nico P. Weiß*,&nbsp;Ulysse Rocabert,&nbsp;Cornelia Hoppe,&nbsp;Jens-Peter Zwick,&nbsp;Konrad Loewe,&nbsp;Maximilian Fries,&nbsp;Antti J. Karttunen,&nbsp;Oliver Gutfleisch and Falk Muench*,&nbsp;","doi":"10.1021/acsaenm.4c0074710.1021/acsaenm.4c00747","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00747https://doi.org/10.1021/acsaenm.4c00747","url":null,"abstract":"<p >Magnetic refrigeration leads the current commercialization efforts of ambient caloric cooling technologies, is considered among its peers most promising in terms of anticipated energy efficiency gain, and allows for complete elimination of harmful coolants. By now, functional magnetocaloric components (so-called regenerators) based on Mn-substituted and hydrogenated LaFeSi alloys are commercially available. However, this alloy system exhibits magnetostriction, is susceptible to fracture, oxidation, and does not passivate well, rendering it prone to failure and corrosion, particularly when using water as favorable heat exchange medium. Demonstrating stable and extended operation of LaFeSi-based regenerators under realistic conditions with cost-sensitive measures thus constitutes a key milestone for derisking the materials system, paving a path toward reliable and maintenance-friendly magnetic cooling devices. Building upon a fundamental analysis of materials properties, process, and target specifications, we outline a 2-fold protection strategy, encompassing a highly conformal copper coating working in tandem with a tailored inhibitor system. The former is applied using an optimized electroless plating procedure, allowing us to evenly envelop complex regenerator architectures in a dense, nondefective, homogeneous, and ductile copper film of excellent interfacial quality. The latter addresses the corrosion characteristics of both coating and substrate in the application environment. In-device aging experiments prove the effectiveness of our multifaceted approach in maintaining the chemical, mechanical, and functional integrity of LaFeSi regenerators under continuous use.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 1","pages":"256–265 256–265"},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsaenm.4c00747","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143088627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stable Operation of Copper-Protected La(FeMnSi)₁₃H _<i>y</i> Regenerators in a Magnetic Cooling Unit.","authors":"Nico P Weiß, Ulysse Rocabert, Cornelia Hoppe, Jens-Peter Zwick, Konrad Loewe, Maximilian Fries, Antti J Karttunen, Oliver Gutfleisch, Falk Muench","doi":"10.1021/acsaenm.4c00747","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00747","url":null,"abstract":"<p><p>Magnetic refrigeration leads the current commercialization efforts of ambient caloric cooling technologies, is considered among its peers most promising in terms of anticipated energy efficiency gain, and allows for complete elimination of harmful coolants. By now, functional magnetocaloric components (so-called regenerators) based on Mn-substituted and hydrogenated LaFeSi alloys are commercially available. However, this alloy system exhibits magnetostriction, is susceptible to fracture, oxidation, and does not passivate well, rendering it prone to failure and corrosion, particularly when using water as favorable heat exchange medium. Demonstrating stable and extended operation of LaFeSi-based regenerators under realistic conditions with cost-sensitive measures thus constitutes a key milestone for derisking the materials system, paving a path toward reliable and maintenance-friendly magnetic cooling devices. Building upon a fundamental analysis of materials properties, process, and target specifications, we outline a 2-fold protection strategy, encompassing a highly conformal copper coating working in tandem with a tailored inhibitor system. The former is applied using an optimized electroless plating procedure, allowing us to evenly envelop complex regenerator architectures in a dense, nondefective, homogeneous, and ductile copper film of excellent interfacial quality. The latter addresses the corrosion characteristics of both coating and substrate in the application environment. In-device aging experiments prove the effectiveness of our multifaceted approach in maintaining the chemical, mechanical, and functional integrity of LaFeSi regenerators under continuous use.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 1","pages":"256-265"},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11773641/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143069822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Graphitic Carbon Nitride: Achieving Superlow Friction and Wear on Engineering Steel","authors":"Lin Li,&nbsp;Tao Lin,&nbsp;Jie Sun,&nbsp;Hanjun Gong*,&nbsp;Yun Bai and Kai Gao*,&nbsp;","doi":"10.1021/acsaenm.4c0069610.1021/acsaenm.4c00696","DOIUrl":"https://doi.org/10.1021/acsaenm.4c00696https://doi.org/10.1021/acsaenm.4c00696","url":null,"abstract":"<p >Graphitic carbon nitride (g-C₃N₄) is a typical two-dimensional (2D) material acclaimed for its layered structure and electronic properties, showcasing promise across various domains such as catalysis, CO₂ reduction, and lubrication. In this study, g-C₃N₄ is synthesized as an oil-based nanoadditive within oleic acid (OA), exhibiting superlow friction coefficient (COF) within steel/steel contacts under high pressure. When dispersed g-C₃N₄ in OA at a concentration of 0.25 wt %, the COF is reduced from 0.077 to 0.022 compared to the base oil. The amino groups in g-C₃N₄ promote the formation of continuous friction films, creating a composite tribofilm made of carbon layers, carbon nitride, and iron oxides. This tribofilm effectively prevents direct contact between tribopairs, leading to significant friction reduction and enhanced antiwear properties. These findings offer insights into the design of lubricant additives for base oils and highlight the promising potential of carbon nitride in lubrication and tribology applications.</p>","PeriodicalId":55639,"journal":{"name":"ACS Applied Engineering Materials","volume":"3 1","pages":"171–177 171–177"},"PeriodicalIF":0.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143091068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}