NANOTECHNOLOGY
·
2018
·Vol. 29
·期 26
·265704
·
IF 3.404
Ting Luo,Xinchun Chen,Peisheng Li,Ping Wang,Cuncheng Li,Bingqiang Cao,Jianbin Luo,Shikuan Yang
Engineering lubricant additives that have extraordinary friction reduction and anti-wear performance is critical to almost any modern mechanical machines. Here, we demonstrate the fabrication of laminated lubricant additives that can combine the advantages of zero-dimensional nanospheres and two-dimensional nanosheets. A simple in situ laser irradiation method is developed to prepare the laminated composite structure composed of ideally ultrasmooth MoS2 sub-microspheres embedded within multiple layers of graphene. These ultrasmooth MoS2 spheres within the laminated structure can change sliding friction into rolling friction under strong shear force created by moving contact surfaces to significantly reduce the friction. Meantime, the graphene layers can behave as 'protection pads' to efficiently avoid the formation of scars on the metal-to-metal contact surfaces. Overall, the laminated composites as lubricant additives synergistically improve the friction reduction and anti-wear properties. Additionally, due to the unique loosely packed laminated structure, the composites can stably disperse in the lubricant for more than 15 d and work under high temperatures without being oxidized. Such constructed laminated composites with outstanding tribological properties by an in situ laser irradiation method supply a new concept in designing lubricant additives that can combine the advantages of 0D and 2D structures.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 14
·8303-8310
·
IF 3.945
Ruirui Wu,Shunfa Gong,Lifang Wu,Hailong Yu,Qiuju Han,Wenzhi Wu
Benefiting from the easily adjustable optical properties of perovskite, CsPbBr3 nanocrystals (NCs) are considered to show their advantages in the field of display. Here, we report that a selective laser irradiation is used to induce CsPbBr3 nanostructural reshaping and then yielding a morphological change. Under 360 or 405 nm laser irradiation, a hierarchical crystal growth process occurs for the fabricated CsPbBr3 nanoplatelets (NPLs), which are first arranged in a side-by-side manner and reshaped into nanorods (NRs), and then NRs are arranged in the face-to-face manner to reshape into NCs. The entire process is monitored optically and microscopically, which showed that crystal growth relies on seeking a dynamic balance between heat dissipation and accumulation under laser irradiation. The heat on NPLs generated by laser irradiation dissipated with a low dissipation rate and thus led to temperature rising and lattice breaking, which turned out to be the driving force for the crystal growth in CsPbBr3 NPLs. This feasible laser irradiation-assisted method provides for crystal growth a reliable and scalable route toward the preparation of perovskite functional materials.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS AND LASERS IN ENGINEERING
·
2024
·
IF 3.5
Kai Li,Junyang Fang,Mingzhen Li,Long Sun,Chao Wang,Fan Du,Xiaoying Wang
Loofah-like nanostructures have been applied in many fields because of their high specific surface area, high porosity, and low density. Developing additive manufacturing methods for loofah-like nanostructures remains a challenge. This paper proposed a novel E-Jet nanoprinting method with real-time laser zone irradiation, for one-step fabricating of loofah-like ZnO nanostructures. The combination of laser irradiation and electrohydrodynamic effect had been proved in detail by adding laser irradiation to the traditional E-Jet printing process. Printable ZnO inks were prepared. The numerical model of the jetting under the combination of flow field and electric field; and the model of the interaction between laser and printing structure were established respectively. The laser beam irradiated the printing structure in real-time to rapidly absorb energy, resulting in thermal expansion and thermal decomposition. The shock wave generated by laser irradiation induced the physical fragmentation and redistribution of particles in the printed structure. Printing at different laser powers was investigated; and the loofah-like ZnO nanostructures, down to the scale of ∼90 nm, have been directly printed without post-processing. The characteristic morphology and hydrophilic characteristics of the printed structure were studied. This study provided a new way for green and efficient additive fabrication of loofah-like nanostructures, which was of significance for the development of nanofabrication and nanodevices.
研究领域:
材料科学
·
纳米技术
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Peiying Han,Li jun Yang,Zhaofei Zhu,Xuyuan Liang,Wanxin Wu
The coffee-ring effect commonly occurs during the evaporation and deposition of particle-laden droplets on the substrates. The resulting deposition pattern is influenced by internal flows, which depend on substrate properties, droplet chemistry, and external conditions. However, in applications such as inkjet printing, drug formulation, and self-assembly, avoiding coffee ring formation is crucial. This study presents a method to suppress the coffee-ring effect using focused laser irradiation on droplet surfaces. By irradiating droplets containing silica microparticles with a green laser and adjusting the particle concentration, we controlled the deposition patterns. Uniform patterns formed at particle concentrations below 0.02%, while gradient patterns appeared above 0.08%. A dimensionless parameter, G, was introduced to quantify particle deposition patterns. Uniform deposition structures are established when Gmax > 10, whereas gradient structures are formed when Gmax < 2. This approach offers new insights into the laser-induced control of microparticle deposition patterns.
研究领域:
流体力学
·
材料科学
·
光学工程
·
表面科学
·
微流体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Xuemin Chen,Ruihong Liu,Shizhang Qiao,Jing Mao,Xiwen Du
Laser irradiation is a green, simple and efficient technique for material synthesis. A laser-activated-catalyst (LAC) technique is proposed for fabrication of nanowires in solution under ambient conditions. In the present work, effects of intrinsic influential factors such as the activity of precursor, precursor concentration, laser energy density and laser irradiation time on the LAC growth of cadmium chalcogenide nanowires are systematically investigated, which help to reveal the fundamental principles of LAC technique. Laser energy density and activity of precursor are proven to be vital for the growth of nanowires, and our work demonstrates that LAC is a universal way for synthesis of cadmium chalcogenides semiconductors.
研究领域:
材料科学
·
纳米技术
·
半导体材料
·
无机化学
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Shigen Bai,Yong Tang,Gong Chen,Yaopeng Wu,Yifu Liang,Shu Yang,Huilong Liu,Yingxi Xie
Supercapacitors (SCs) have garnered increasing attention as an alternative energy storage device but the relatively low potential window and energy density impede their application prospect. Herein, we propose a novel three-dimensional (3D) packaging method for the first time, utilizing high flexible phosphor-copper sheets (PCSs) sprayed with polytetrafluoroethylene (PTFE) and covered with polyimide (PI) films on their both sides as the serial medium followed by CO 2 laser irradiation to fabricate all-solid-state flexible high voltage supercapacitors (HVSCs). This method achieves double voltage output in the limited PI membrane compared with common 2D encapsulation. As a result, as-obtained HVSCs deliver not only an enhanced mechanical tensile strength up to 18.23 MPa but also the outstanding electrochemical performances, including ultrahigh working voltage window (10 V), high energy density (37.68 μWh/cm 2 ) and power density (3.38 mW/cm 2 ). Owing to the excellent flexibility, the HVSCs can be arbitrarily bent or twisted without obvious attenuation on capacitive property. After 10000 cycles, the capacitance retention of HVSCs still maintains to be 90.2%. This novel 3D packaging strategy may pave the way for developing high-performing SCs with wide operating voltage and high energy density for flexible displays, wearable equipment and integrated electrical devices.
研究领域:
材料科学
·
纳米技术
·
能源存储
·
柔性电子
·
电化学
·
高分子材料
·
先进制造
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 12
·8445-8453
·
IF 3.9
Xiaoyun Huang,Zhiming Liu,Weijian Zeng,Xiaoyu Ma,Yu Zhang,Muye Li,Jiutong Sun,Sheng Mao,Li Bian
Fenton catalytic medicine that catalyzes the production of ·OH without external energy input or oxygen as a substrate has reshaped the landscape of conventional cancer therapy in recent decades, yet potential biosafety concerns caused by non-safety-approved components restrict their clinical translation from the bench to the bedside. Herein, to overcome this dilemma, we elaborately utilizate safety-approved hetastarch, which has been extensively employed in the clinic as a plasma substitute, as a stabilizer participating in the copper chloride-initiated polymerization of pyrrole monomer before loading it with DOX. The constructed DOX-loaded hetastarch-doped Cu-based polypyrrole (HES@CuP-D) catalyzes the excess H2O2 in tumor cells to ·OH through a Cu+-mediated Fenton-like reaction, which not only causes oxidative damage to tumor cells but also leads to the structural collapse and DOX release. Additionally, HES@CuP-D together with laser irradiation reinforces tumor killing efficiency by hyperthermia-enhanced catalytic activity and -accelerated drug release. As a result, the developed HES@CuP-D provides a promising strategy for Fenton catalytic therapy with negligible toxicity to the body.
研究领域:
生物医学工程
·
癌症治疗
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Intelligent Robotics and Applications
·
2018
·Vol. 2
·期 4
·445-453
·
IF 0
Liu Yanting,Liu Yang,Shen Yajing
The bottom-up organization of noble metal nanostructures with nanometer-scale precision is an important goal in nanotechnology. Owing to their unique localized surface plasmon resonance, well-defined metal nanostructures arrays could be used to develop applications in nano-photonics, nano-plasmonics, and nano-electronics. This article proposes an alternative pathway of a controllable approach to assemble and weld together the gold nanostructures. As a typical plasmonic nanostructure, the gold nanorods (Au NRs) was synthesized by the classical seed-mediated growth method. Based on the recognition of biomolecules through complementary DNA hybridization, we used DNA origami strategy for controllable assembly of Au NRs. Rectangular DNA origami as a template can induce the geometrically assembled of Au NRs. We designed and fabricated tip-to-tip Au NRs dimers on the DNA templates. Then,the follow-up formation of nanojunctions between assembled tip-to-tip Au NRs dimers Au NRs was conducted by irradiating infrared femtosecond pulses laser. The ability to coupling plasmonic nanostructures by assembly and nano-welding could be fundamental to developing novel optical properties and ensuring materials.
研究领域:
纳米技术
·
光子学
·
等离激元学
·
材料科学
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Tingxue Fang,Jiawei Wang,Zongxuan Bai,Yuhao Wang,Nan Wang,Dong Xiang,Kedi Cai
It remains critical and challenging to synthesize non-noble metal catalysts with excellent hydrogen evolution reaction (HER) activity in a wide pH range. High-temperature pyrolysis is one of the main methods for catalyst synthesis but can be time-consuming and leads to agglomeration easily. In view of this, molybdenum carbide and molybdenum nitride composite (MoC@MoN) was prepared via CO2 laser irradiation technology. The catalytic activity of the as-prepared catalysts can be effectively regulated by controlling the usage of Na2MoO4·2H2O and the applied CO2 laser power. In acidic and alkaline media, the as-prepared MoC@MoN requires an overpotential of only 63 mV and 34 mV, respectively, at a current density of 10 mA cm–2 and exhibits considerable electrochemical and structural durability, making it a suitable candidate for hydrogen production in a wide pH range. Theoretical calculations reveal the surface adsorption and desorption properties of reactive hydrogen and confirm the energetically favorable hydrogen spillover on the heterostructured MoC@MoN interface. The construction of the heterostructured interface enhances the activation of H2O* and further decreases the energy barrier of H2O* dissociation, thereby promoting the Volmer step and the H* supply for HER on the MoC@MoN interface. The integration of efficient H* adsorption on MoN and easy desorption on MoC effectively accelerates the Tafel step and hydrogen spillover, resulting in excellent HER performance of MoC@MoN. The strategy presented in this paper may offer a unique and viable approach for designing and synthesizing high-performance, low-cost HER catalysts, applied in a wide pH range.
研究领域:
电化学
·
催化
·
材料科学
·
纳米技术
·
表面科学
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Qingli Qu,Jian Zhang,Xiaoqiong Chen,Hossein Ravanbakhsh,Guosheng Tang,Ranhua Xiong,Bella B. Manshian,Stefaan J. Soenen,Félix Sauvage,Kevin Braeckmans,Stefaan C. De Smedt,Chaobo Huang
Triggered compound release has attracted considerable attention in recent years. However, the concepts and carriers reported for triggered release are often complex while nonapproved ingredients are mostly used to make the carriers. In this study, a bioinspired reactive oxygen species (ROS)-mediated delivery system, triggered by light, is introduced. We took inspiration from the well-known ROS mediated degradation of wood (cellulose) by brown-rot fungi and designed microparticles which consist of a core of cellulose nanocrystals, loaded with a drug, surrounded by a light sensitive shell. Incorporating indocyanine green, an FDA-approved photosensitizer, in the shell of the microparticles generates ROS upon NIR laser irradiation, which degrades the cellulose nanocrystals in the microparticles. It was revealed that doxorubicin, encapsulated in the cellulose core and used as a model compound in our study, becomes specifically released upon NIR irradiation of the microparticles. Attractive as well is that the microparticles are prepared by a simple one-step gas-shearing process and fully consist of compounds generally regarded as safe (GRAS).
研究领域:
材料科学
·
药学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·4898-4907
·
IF 9.5
Geng Jing,Ji Sihan
Electrocatalytic nitrate ( \({\rm{N}}{{\rm{O}}_3}^ -\) ) reduction to ammonia (NH 3 ) offers a viable approach for sustainable NH 3 production and environmental denitrification. Copper (Cu) possesses a distinctive electronic structure, which can augment the reaction kinetics of \({\rm{N}}{{\rm{O}}_3}^ -\) and impede hydrogen evolution reaction (HER), rendering it a promising contender for the electrosynthesis of NH 3 from \({\rm{N}}{{\rm{O}}_3}^ -\) . Nevertheless, the role of Cu 2 O in copper-based catalysts still requires further investigation for a more comprehensive understanding. Herein, the Cu 2 O/Cu(OH) 2 heterostructures are successfully fabricated through liquid laser irradiation using CuO nanoparticles as a precursor. Experimental and theoretical researches reveal that Cu 2 O/Cu(OH) 2 heterostructure exhibits enhanced electrocatalytic performance for \({\rm{N}}{{\rm{O}}_3}^ -\) to NH 3 because Cu(OH) 2 promotes electron transfer and reduces the valence state of Cu active site in Cu 2 O. At −0.6 V (vs. reversible hydrogen electrode (RHE)), the NH 3 yield reaches its maximum at 1630.66 ± 29.72 \({\rm{\mu g}} \cdot {{\rm{h}}^{ - 1}} \cdot {\rm{m}}{{\rm{g}}_{{\rm{cat}}}}^{ - 1}\) , while the maximum of Faraday efficiency (FE) is 76.95% ± 5.51%. This study expands the technical scope of copper-based catalyst preparation and enhances the understanding of the electrocatalytic mechanism of \({\rm{N}}{{\rm{O}}_3}^ -\) to NH 3 .
研究领域:
电化学
·
催化
·
环境科学
·
纳米材料
·
能量转换
·
表面化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Cheng Xu,Haojie Liu,Zirun Peng,Yan Zhang,Na Liu,Shiheng Li,Zhong Lin Wang,Peizhong Feng
The output performance of triboelectric nanogenerators (TENGs) largely depends on the density of electrons on the surface of the triboelectric materials, which is usually generated by the direct contact of two solid materials. Here, a novel method is proposed to regulate the surface charges of materials without physical contact. A laser-tunable noncontact triboelectric nanogenerator (LTNC-TENG) is fabricated, enabling the dynamic regulation of the surface states of materials through laser irradiation to optimize the performance of TENGs. In the experiment, TiO2, SiO2, and VO2 LTNC-TENGs are designed and prepared. The results show that under low-energy laser irradiation, the open-circuit voltage (VOC) and short-circuit transferred charge (QSC) increase, primarily due to the enhancement of the surface state energy levels induced by laser irradiation. As the laser energy increases beyond the laser-induced damage threshold (LIDT) of the films, induced damage occurs, generating abundant high-temperature plasma and resulting in decreased VOC and QSC. Building upon these findings, a single-electrode mode LTNC-TENG is developed where voltage jumps occur when laser energy exceeds the film’s LIDT. Furthermore, an electron cloud-potential well model is proposed, describing the approach of atoms from two different materials under laser irradiation without direct contact. This model elucidates the detailed mechanism of laser-induced charge transfer and reveals the “precursor” process of contact electrification. This study contributes to a deeper understanding of the underlying mechanisms of contact electrification and provides a theoretical foundation for the development of more advanced and noncontact TENGs, with largely enhanced lifetime.
研究领域:
纳米技术
·
能量收集
·
光电子学
·
表面科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）