IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-06 DOI: 10.1016/S0008-6223(26)00003-5

引用次数: 0

Advantages of precursor with high graphitizability in the preparation of carbon-graphite sealing materials for excellent high-temperature wear performance 具有高石墨化性的前驱体在制备具有优异高温磨损性能的碳-石墨密封材料中的优势

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-06 DOI: 10.1016/j.carbon.2026.121242

Yixing Chen , Run Li , Wenyong Nie , Pei Gong , Haiyang Zhang , Gaimei Ren , Xingqiang Mei , Xun He , Jiao Tan , Shuang Kou , Yanli Liu , Chuanjun Tu

Carbon-graphite sealing materials play essential roles in modern mechanical industry. However, fabricating carbon-graphite materials suitable for harsh high-temperature service conditions remains a significant challenge. Herein, we prepare carbon-graphite materials with excellent high-temperature wear performance using needle coke with high graphitizability as the precursor and pitch as the binder. Compared with disordered-structure precursors, needle coke exhibits distinct anisotropic characteristics and high graphitizability. As expected, the carbon-graphite material prepared with needle coke as the precursor features a more ordered graphite crystal structure, as reflected by a higher graphitization degree and a larger graphite crystallite size. During high-temperature wear, the graphite lubricating film formed at the wear interface of this needle coke-based carbon-graphite material exhibits excellent oxidative stability, which endows the material with outstanding high-temperature tribological properties. Specifically, in the wear test conducted at 500 °C, carbon-graphite material exhibits an average friction coefficient as low as 0.063 ± 0.003 and a wear rate of merely (4.35 ± 0.76) × 10⁻³ mm³·N⁻¹·m⁻¹, which are more advantageous than carbon-graphite material with lower graphitization degree.

碳-石墨密封材料在现代机械工业中占有重要地位。然而，制造适合恶劣高温使用条件的碳石墨材料仍然是一个重大挑战。本文以石墨化性高的针状焦炭为前驱体，沥青为粘结剂，制备了具有优异高温磨损性能的碳-石墨材料。与无序结构前驱体相比，针状焦具有明显的各向异性和高石墨化性。正如预期的那样，以针状焦炭为前体制备的碳-石墨材料具有更有序的石墨晶体结构，石墨化程度更高，石墨晶粒尺寸更大。在高温磨损过程中，该针状焦炭基碳-石墨材料在磨损界面处形成的石墨润滑膜表现出优异的氧化稳定性，使得该材料具有优异的高温摩擦学性能。其中，在500℃下进行的磨损试验中，碳-石墨材料的平均摩擦系数低至0.063±0.003，磨损率仅为（4.35±0.76）× 10−3 mm3·N−1·m−1，比石墨化程度较低的碳-石墨材料更具优势。

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引用次数: 0

Optical band gap determination of carbon dots: A critical comparison of tangent and Tauc plot methods benchmarked with metal oxides 碳点的光学带隙测定：以金属氧化物为基准的切线和Tauc图方法的关键比较

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-05 DOI: 10.1016/j.carbon.2026.121239

Fanhao Zeng , Chunyu Ji , Zhuang Xiang , Lipeng Gao , Wenjun Xu , Zhili Peng

This study systematically evaluates the tangent and Tauc plot methods for determining the bandgap (Eg) of carbon dots (CDs), using metal oxides as reference systems. The tangent method proves simple and efficient for materials with well-defined band edges, showing an error within 5.0 %. For CDs containing substantial impurity states, however, the Tauc plot method delivers more reliable Eg estimates than the tangent method. Experimental conditions—such as the dispersion medium (e.g., BaSO₄ ratio) and ambient moisture—are shown to significantly influence the measured Eg values. For CDs lacking a clear zero-absorption region, we recommend a guided extrapolation procedure, which reduces the determination error as high as 20.4 % down to below 2.8 %.

本研究以金属氧化物为参照系，系统地评价了测定碳点（CDs）带隙（Eg）的正切图和Tauc图方法。结果表明，切线法对具有明确带边的材料简单有效，误差在5.0%以内。然而，对于含有大量杂质态的cd， Tauc图方法提供比正切方法更可靠的Eg估计。实验条件——如分散介质（如BaSO4比）和环境湿度——对测量的Eg值有显著影响。对于缺乏明确的零吸收区的CDs，我们建议采用引导性外推法，将测定误差从20.4%降低到2.8%以下。

引用次数: 0

Novel carbon-based spintronic devices enabled by rhombus-shaped nanographenes 菱形纳米石墨烯驱动的新型碳基自旋电子器件

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-05 DOI: 10.1016/j.carbon.2026.121243

Yaojun Dong , Siliang Hua , Mingfa Peng , Xixi Tao , Jinhua Zhou , Xifeng Yang , Yushen Liu , Xuefeng Wang

Rhombus-shaped nanographenes (RNGs) exhibit significant potential for room-temperature spintronics applications due to their measurable magnetic exchange coupling and robust all-carbon magnetism. In this study, we investigate the spin transport properties of spintronic devices based on RNGs, which are sandwiched between two zigzag graphene nanoribbon (ZGNR) electrodes interconnected via carbon-chains. In the parallel magnetic configuration of the two ZGNR electrodes, an outstanding spin filtering effect is observed, allowing only spin-up electrons to transmit. Furthermore, the connection geometry between the RNGs and carbon-chains plays a critical role in quantum transport. We also explore the photogalvanic effect (PGE) in these RNG-based nanodevices. Under anti-parallel magnetic configuration of the electrodes, light irradiation induces spin-up and spin-down currents of equal magnitude but opposite directions. In this configuration, the net charge current is suppressed, while a finite pure spin current emerges. Notably, the PGE-generated currents can be modulated by the RNG–carbon-chain connection geometry. Our findings highlight the considerable potential of RNGs in designing multifunctional spintronic single-molecule nanodevices.

菱形纳米石墨烯（RNGs）由于其可测量的磁交换耦合和强大的全碳磁性，在室温自旋电子学应用中表现出巨大的潜力。在这项研究中，我们研究了基于rng的自旋电子器件的自旋输运性质，rng被夹在两个通过碳链连接的之字形石墨烯纳米带（ZGNR）电极之间。在两个ZGNR电极的平行磁结构中，观察到一个突出的自旋滤波效应，只允许自旋向上的电子传输。此外，rng和碳链之间的连接几何形状在量子输运中起着关键作用。我们还探讨了这些基于rng的纳米器件中的光电效应（PGE）。在电极的反平行磁结构下，光照射产生大小相等但方向相反的自旋向上和自旋向下电流。在这种结构中，净电荷电流被抑制，而一个有限的纯自旋电流出现。值得注意的是，pge产生的电流可以通过rng -碳链连接几何形状进行调制。我们的发现突出了rng在设计多功能自旋电子单分子纳米器件方面的巨大潜力。

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引用次数: 0

Hard carbon engineering via pyrolysis heating rate: tailoring amorphous and porous structure for highly reversible sodium-ion storage 通过热解加热速率进行硬碳工程：为高可逆钠离子存储定制非晶和多孔结构

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-05 DOI: 10.1016/j.carbon.2026.121238

Rutong Yang , Jian Yin , Yu Liu , Hu Zhang , Rui Zhang , Ruiqiang Huo , Chen Yang , Danfeng Li , Jiao Yin , Feng Yu , Hui Zhu

Hard carbon (HC) represents a promising anode material for Na-ion batteries endowed by its unique amorphous and porous structure for Na-ion storage. Pyrolysis process of precursors at low temperatures critically influences the HC structure by modulating the transformation of gas, liquid, and solid phases, yet its mechanistic impact remains poorly understood. Herein, the heating rate during low-temperature pyrolysis is investigated for the HC structure evolution and Na-ion storage performance. By increasing the heating rate, the thermochemical kinetics of pyrolysis process can be enhanced, facilitating non-carbonaceous (H, O, etc.) atom removal. When an ultrafast heating rate is applied, high pyrolysis kinetics promote the generation of thermally stable ester functional groups, thereby inhibiting the aromatic aggregation and facilitate to form random carbon skeleton. Furthermore, the ester functional groups decompose into volatiles at high-temperature carbonization, resulting in porous structure suitable for Na-ion storage. The optimized HC achieves a reversible capacity of 426.2 mAh g⁻¹ with an initial Coulombic efficiency of 88.7 %. The investigation elucidates the structural evolution mechanism by heating rate modulation during pyrolysis, providing a straightforward strategy for industrially applicable HC production.

硬碳（HC）具有独特的非晶多孔结构，是一种很有前途的钠离子电池负极材料。前驱体低温热解过程通过调节气、液、固相的转变对HC结构产生重要影响，但其机理尚不清楚。本文研究了低温热解过程中升温速率对HC结构演变和na离子储存性能的影响。通过提高升温速率，可以增强热解过程的热化学动力学，有利于非碳质（H、O等）原子的去除。当采用超快的加热速率时，高的热解动力学促进热稳定的酯官能团的生成，从而抑制芳香族聚集，有利于形成随机碳骨架。此外，酯官能团在高温碳化时分解为挥发物，形成适合na离子储存的多孔结构。优化后的HC的可逆容量为426.2 mAh g−1，初始库仑效率为88.7%。该研究阐明了热解过程中加热速率调节的结构演化机制，为工业上应用的HC生产提供了一个简单的策略。

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引用次数: 0

Broadband electromagnetic wave absorption by ultrathin graphene honeycombs with multicomponent heterointerfaces 具有多组分异质界面的超薄石墨烯蜂窝的宽带电磁波吸收

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-05 DOI: 10.1016/j.carbon.2026.121240

Ruige Su , Misheng Liang , Xiaoguang Zhao , Wenqiang Xing , Yimeng Jiang , Xiaomeng Bian , Mengyao Tian , Xiaoyang Zhou , He Tian , Rui You

The widespread use of advanced radar and electronic systems drives the need for ultrathin, lightweight, and broadband electromagnetic (EM) absorbers. In response, we designed a femtosecond-laser-induced NiFe₂O₄@MXene composite graphene (LINFMG) that incorporates a honeycomb structure, abundant C–N dipoles, and multiple heterogeneous interfaces. EM waves undergo multiple reflections within the honeycomb structure of graphene and interact with heterogeneous interfaces, dipoles, and magnetic materials on the pore walls. Through the synergistic enhancement of multi-mechanism coupling, LINFMG achieves record-breaking EM absorption performance among all laser-induced graphene-based materials while maintaining an ultrathin characteristic. The optimal reflection loss of LINFMG has been reduced to −68.2 dB, with an optimal effective absorption bandwidth (EAB) reaching 6.8 GHz. LINFMG also demonstrates radar cross-section (RCS) reduction, achieving a maximum value of 31.22 dB m². This study provides valuable insights into the design and facile one-step fabrication of advanced graphene-based EM wave absorbers.

先进雷达和电子系统的广泛应用推动了对超薄、轻量化和宽带电磁（EM）吸收器的需求。为此，我们设计了一种飞秒激光诱导NiFe2O4@MXene复合石墨烯（LINFMG），它具有蜂窝结构、丰富的C-N偶极子和多个非均相界面。电磁波在石墨烯的蜂窝结构内经历多次反射，并与孔壁上的非均质界面、偶极子和磁性材料相互作用。通过多机制耦合的协同增强，LINFMG在保持超薄特性的同时，在所有激光诱导石墨烯基材料中实现了破纪录的EM吸收性能。LINFMG的最佳反射损耗降至- 68.2 dB，最佳有效吸收带宽（EAB）达到6.8 GHz。LINFMG还显示雷达横截面（RCS）降低，达到31.22 dB m2的最大值。该研究为先进的石墨烯基电磁波吸收器的设计和一步制造提供了有价值的见解。

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引用次数: 0

Construction of integrated structural-microwave absorbing composites: Layered double hydroxide exfoliation-reassembly strategy 集成结构-微波吸收复合材料的构建：层状双氢氧化物剥离-重组策略

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-05 DOI: 10.1016/j.carbon.2026.121241

Wanxin Hu, Xiaohu Ren, Hongfeng Yin, Yun Tang, Hudie Yuan

Layered double hydroxides (LDHs) featuring various large-sized interlayer anions, namely, chloride ions, acetate ions and dodecyl sulfate ions, were successfully synthesized through ion-exchange procedures. Anion-functionalized LDHs were integrated with carbon black (CB) to construct microcapacitors, demonstrating potential applications in microwave absorption. The microwave absorption properties of the composites were enhanced by virtue of the conductive percolation networks of CB and the dipole polarization of microcapacitors. To further refine the microcapacitor structure, oxidized CB and exfoliated LDH nanosheets were assembled via electrostatic attraction. This strategic combination elevated the reflection loss of the composite to −61.1 dB, and an effective absorption bandwidth of 6.43 GHz was achieved at a thickness of 2.1 mm with a filler loading of 8 wt%. In addition, the flexural strength and impact strength of the composite were improved to 59.1 ± 13.1 MPa and 90.5 ± 5.9 kJ/m², respectively. By taking advantage of the versatile tunability of LDHs (including anion exchange, exfoliation, and reassembly of exfoliated nanosheets), microwave absorbing materials with excellent electromagnetic wave attenuation performance were elaborately fabricated. This methodology provides new insights into the design and optimization of integrated structural-microwave absorbing composites.

采用离子交换法成功合成了具有氯离子、醋酸离子和十二烷基硫酸盐离子等层间大尺寸阴离子的层状双氢氧化物（LDHs）。将阴离子功能化的LDHs与炭黑（CB）集成在一起构建微电容器，在微波吸收方面显示出潜在的应用前景。利用炭黑的导电渗透网络和微电容器的偶极子极化，增强了复合材料的微波吸收性能。为了进一步完善微电容器的结构，通过静电吸引将氧化的CB和脱落的LDH纳米片组装在一起。这种策略组合将复合材料的反射损耗提高到- 61.1 dB，并且在厚度为2.1 mm，填充量为8wt %的情况下，有效吸收带宽达到6.43 GHz。复合材料的抗折强度和冲击强度分别达到59.1±13.1 MPa和90.5±5.9 kJ/m2。利用LDHs的多种可调性（包括阴离子交换、剥离和剥离纳米片的重组），精心制备了具有优异电磁波衰减性能的微波吸收材料。该方法为集成结构吸波复合材料的设计和优化提供了新的思路。

{"title":"Construction of integrated structural-microwave absorbing composites: Layered double hydroxide exfoliation-reassembly strategy","authors":"Wanxin Hu, Xiaohu Ren, Hongfeng Yin, Yun Tang, Hudie Yuan","doi":"10.1016/j.carbon.2026.121241","DOIUrl":"10.1016/j.carbon.2026.121241","url":null,"abstract":"<div><div>Layered double hydroxides (LDHs) featuring various large-sized interlayer anions, namely, chloride ions, acetate ions and dodecyl sulfate ions, were successfully synthesized through ion-exchange procedures. Anion-functionalized LDHs were integrated with carbon black (CB) to construct microcapacitors, demonstrating potential applications in microwave absorption. The microwave absorption properties of the composites were enhanced by virtue of the conductive percolation networks of CB and the dipole polarization of microcapacitors. To further refine the microcapacitor structure, oxidized CB and exfoliated LDH nanosheets were assembled via electrostatic attraction. This strategic combination elevated the reflection loss of the composite to −61.1 dB, and an effective absorption bandwidth of 6.43 GHz was achieved at a thickness of 2.1 mm with a filler loading of 8 wt%. In addition, the flexural strength and impact strength of the composite were improved to 59.1 ± 13.1 MPa and 90.5 ± 5.9 kJ/m<sup>2</sup>, respectively. By taking advantage of the versatile tunability of LDHs (including anion exchange, exfoliation, and reassembly of exfoliated nanosheets), microwave absorbing materials with excellent electromagnetic wave attenuation performance were elaborately fabricated. This methodology provides new insights into the design and optimization of integrated structural-microwave absorbing composites.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"249 ","pages":"Article 121241"},"PeriodicalIF":11.6,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen-doped porous carbon paper synthesis by expansion of fiber-shell graphene oxide for efficient electrocatalytic hydrogen evolution reaction 膨胀纤维壳氧化石墨烯制备氮掺杂多孔碳纸，用于高效电催化析氢反应

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-03 DOI: 10.1016/j.carbon.2025.121225

Ji Hyeon Lim , Ji Heon Lim , Min Sang Kwon , Ki Chang Kwon , Sun Hwa Park , Ho Won Jang , Jong Hun Kang

With its superior electrical conductivity and mechanical stability, carbon paper (CP) is widely used as a gas-diffusion layer or catalytic support in many electrochemical devices. However, commercial carbon papers typically exhibit a limited specific surface area (<1 m² g⁻¹) and poor hydrophilicity, which impede their use in aqueous electrochemical systems. Enhancing the porosity and hydrophilicity of carbon paper while preserving its electrical conductivity will offer many advantages, such as increasing the availability of active sites for electrocatalytic reactions. Herein, we demonstrate a simple route in which graphene oxide (GO) surfaces are first introduced onto carbon microfibers and then thermally treated with urea. Gases are released from thermally decomposing urea, and GO expands the layers and simultaneously modifies the chemical nature of resultant carbon surfaces, yielding a highly porous, N-doped reduced graphene oxide (rGO) surface. This process increases the specific surface area by 75–270 times while keeping the electrical conductivity comparable to the pristine parent CP. The anchoring of Ru mediated by nitrogen sites on N-doped CP resulted in enhanced Ru dispersion and accelerated hydrogen evolution reaction (HER) kinetics than pristine CP. N-doped CP electrodes showed HER overpotential of ca. 60 mV at 300 mA cm⁻², outperforming pristine CP and commercial Pt/C electrodes. At the same time, the N-doped surface becomes markedly hydrophilic, so H₂ bubbles detach quickly, and mass-transport losses are minimized. We expect that this strategy, which couples high porosity, good conductivity, and strong metal-support interactions in a single step, can be facilely extended to other catalysts and electrochemical technologies.

由于其优良的导电性和机械稳定性，碳纸在许多电化学装置中被广泛用作气体扩散层或催化载体。然而，商用碳纸通常表现出有限的比表面积（<1 m2 g−1）和较差的亲水性，这阻碍了它们在水电化学系统中的应用。提高碳纸的孔隙度和亲水性，同时保持其导电性，将提供许多优点，如增加电催化反应活性位点的可用性。在这里，我们展示了一种简单的途径，其中氧化石墨烯（GO）表面首先被引入到碳微纤维上，然后用尿素进行热处理。气体从热分解尿素中释放出来，氧化石墨烯扩展了碳层，同时改变了所得碳表面的化学性质，从而产生了高度多孔的n掺杂还原氧化石墨烯（rGO）表面。这一过程将比表面积增加了75-270倍，同时保持了与原始母体CP相当的电导率。氮位点介导的Ru锚定在n掺杂CP上，导致Ru的分散增强，并加速了析氢反应（HER）动力学。在300 mA cm - 2时，n掺杂CP电极的HER过电位约为60 mV，优于原始CP和商用Pt/C电极。同时，n掺杂的表面变得明显亲水，因此H2气泡迅速分离，质量输运损失最小。我们希望这种将高孔隙率、良好导电性和强金属-支撑相互作用在一个步骤中结合起来的策略可以很容易地扩展到其他催化剂和电化学技术中。

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引用次数: 0

Hybrid porous carbon-based electromagnetic wave absorbing metamaterial with array doping 阵列掺杂的杂化多孔碳基电磁波吸收材料

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-03 DOI: 10.1016/j.carbon.2025.121222

Xiaoyong Wu , Wanchong Li , Lu Feng , Shicheng Jin , Zaiqing Yang , Zhe Wang , Dongxu Zhao , Yan Wang , Yu Mao , Jinsong Zhang

In response to the escalating challenges of electromagnetic radiation and pollution, periodic array absorbing materials have emerged as promising solutions. However, conventional single-periodicity structures frequently encounter difficulties in simultaneously satisfying the requirements for broad bandwidth absorption and high-efficiency loss. Drawing inspiration from atomic doping in optical materials—which expands absorption bandwidths—this study proposes a hybrid porous carbon-based electromagnetic wave absorbing metamaterial utilizing an array-doping strategy. By constructing multi-scale tapered units arranged in a doped array configuration, and optimizing the architecture through combined simulation and experimentation, a lightweight periodic gradient system was developed. Furthermore, a hollowing process was employed to eliminate regions contributing minimally to loss. The resulting hollow conical array material achieves ultra-broadband absorption exceeding −10 dB across the 2.3–40 GHz frequency range. Additionally, it maintains robust wide-angle absorption characteristics for both TE (Transverse Electric) and TM (Transverse Magnetic) waves under incident angles from 0° to 50°. This array-doped periodic design strategy offers a novel paradigm for realizing high-efficiency, broadband electromagnetic wave absorbing materials.

为了应对不断升级的电磁辐射和污染挑战，周期阵列吸波材料已经成为有前途的解决方案。然而，传统的单周期结构往往难以同时满足宽带宽吸收和高效率损耗的要求。从光学材料中的原子掺杂中获得灵感——这扩大了吸收带宽——本研究提出了一种利用阵列掺杂策略的混合多孔碳基电磁波吸收超材料。通过构建以掺杂阵列形式排列的多尺度锥形单元，并通过仿真与实验相结合的方法对结构进行优化，研制了轻量化周期梯度系统。此外，采用空化过程来消除对损失贡献最小的区域。由此产生的空心锥形阵列材料在2.3-40 GHz频率范围内实现了超过- 10 dB的超宽带吸收。此外，在0°至50°的入射角范围内，它对TE（横电）和TM（横磁）波保持稳健的广角吸收特性。这种掺杂阵列的周期性设计策略为实现高效宽带电磁波吸收材料提供了一种新的范例。

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引用次数: 0

Amphiphilic carbon dots and extended surfactants: Synergistic interfacial regulation, emulsification stability, and wettability reversal for enhanced oil recovery 两亲性碳点和扩展表面活性剂：协同界面调节、乳化稳定性和提高采收率的润湿性逆转

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2026-01-02 DOI: 10.1016/j.carbon.2026.121227

Yu Wu , Yancheng Zheng , Fuchang You , Xuejin Liu , Guoqing Zhang

In tertiary oil recovery from low-permeability and high-salinity reservoirs, conventional surfactants often face challenges such as insufficient interfacial activity and poor emulsion stability, underscoring the urgent need for innovative blend systems with synergistic interfacial regulation capabilities. In this study, a blend system was developed by combining amphiphilic nitrogen-doped carbon dots (ANCDs) with an anionic extended surfactant (C16P3E6S), and its performance in interfacial behavior modulation and enhanced oil recovery (EOR) was systematically investigated. The ANCDs, synthesized via hydrothermal treatment followed by long-chain alkyl modification, exhibited particle sizes below 5 nm and abundant surface polar groups (hydroxyl, amide, quaternary ammonium) along with hydrophobic segments, endowing them with excellent interfacial activity and self-assembly ability. When blended at mass ratios of 3:2 and 1:1, the resulting blend system formed charge-complementary mixed micelles, which maintained ultra-low oil–water interfacial tensions (as low as 8 × 10⁻⁴ mN/m) over a 7 %–12 % NaCl salinity range, while achieving emulsification rates exceeding 90 % and distinct wettability reversal behavior. Core flooding experiments demonstrated that the blend system achieved a maximum oil recovery improvement of 35.77 %, significantly outperforming the individual components. This superior EOR performance was attributed to multiple cooperative mechanisms, including interfacial tension reduction, enhanced emulsion stability, and wettability reversal control. This study provides a new material design approach and theoretical basis for the application of synergistic nano-surfactant blend systems in low-permeability reservoirs.

在低渗透、高矿化度油藏的三次采油中，常规表面活性剂往往面临界面活性不足、乳液稳定性差等挑战，因此迫切需要具有协同界面调节能力的新型混合体系。本研究将两亲性氮掺杂碳点（ANCDs）与阴离子扩展表面活性剂（C16P3E6S）结合，构建了一种共混体系，并对其界面行为调节和提高采收率（EOR）的性能进行了系统研究。通过水热处理和长链烷基改性合成的合成产物具有粒径小于5 nm、表面极性基团（羟基、酰胺、季铵）丰富、疏水段丰富的特点，具有良好的界面活性和自组装能力。当质量比为3:2和1:1时，所得到的共混体系形成电荷互补的混合胶束，在7% - 12% NaCl盐度范围内保持超低的油水界面张力（低至8 × 10−4 mN/m），同时实现超过90%的乳化率和明显的润湿性逆转行为。岩心驱油实验表明，该混合体系最大采收率提高了35.77%，明显优于单个组分。这种优异的EOR性能归功于多种协同机制，包括界面张力降低、乳液稳定性增强和润湿性逆转控制。该研究为纳米表面活性剂协同共混体系在低渗透油藏中的应用提供了新的材料设计思路和理论依据。

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引用次数: 0

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