CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuang Chen,Yang Zou,Lili Zhao,Zijian Lei,Lixin Song
Point defect has a significant impact on the optical properties of materials. The light absorption behavior can be changed through adjusting the concentration of point defect. Here, nonequilibrium surface oxygen vacancy is firstly introduced into MgTiO 3 material and then eliminated under laser irradiation to realize an optical transformation from high absorption to high reflectivity among a wide range of wavelength. NaBH 4 low-temperature reduction treatment is conducted to control the distribution of oxygen vacancy. MgTiO 3 @MgTiO 3-x core-shell structure is fabricated through the treatment, in which disordered MgTiO 3-x with high-concentration of oxygen vacancy forms a shell covering a highly crystalline MgTiO 3 core. The reflectivity is reduced to 5 % among 400–2500 nm due to the interconduction subband absorption of the metallized disordered MgTiO 3-x shell. Research shows that the core-shell structure is beneficial for enhancing the transformation rate owing to the short diffusion distance. Remarkably, under 100 W cm −2 1064 nm laser irradiation, the nonequilibrium surface oxygen vacancy can be eliminated in a short time and the material will transform to high-reflectivity state in 1000 ms, with the reflectivity restoring to 83 %.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Zhengquan Su,Chao Zhang,Jun Liu,Changhao Liang
Tuning crystal structure of metal nanomaterials is an effective approach to optimize electrocatalytic performance. Here, we employ amorphous FeNi alloy nanoparticles encapsulated in N doped carbon shell (A-FeNi@NC) as an efficient electrocatalyst for oxygen evolution reaction (OER) via laser irradiation in H 2 O. The formation mechanism of amorphous FeNi alloy is due to the rapid heating and cooling rate result from the pulse laser. The following electrochemical measurements indicate that A-FeNi@NC displays much better OER activity compared with the conventional crystalline FeNi alloy nanoparticles encapsulated in N doped carbon shell (C-FeNi@NC). We proposed that amorphous FeNi alloy possess favorable electronic property to optimize electronic state of the external carbon shell and give rise to a higher electrocatalytic activity towards OER. The optimized electronic state of the external carbon shell commonly exists in other amorphous transition metal include FeCo, CoNi and Ni, give birth to a series of efficient electrocatalysts for OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 47
·34804-34810
·
IF 3.9
Hongyu Guo,Qiao Ding,Yang Yang,Chenguang Du,Zhihong Nie
We report here on dual shape transformations of the same thermo-responsive hybrid hydrogel sheet under irradiation of a laser with two different wavelengths (808 nm and 450 nm). By in situ etching the silver nanoprisms in the sheet to silver nanodiscs by using chloride ions (Cl−), two areas with distinct light extinction properties are integrated in a single sheet. The conversion of photon energy to thermal energy in local areas by the silver nanoprisms or nanodiscs under laser irradiation with an appropriate wavelength heats up the sheet locally and causes a local volumetric shrinkage, and hence a volumetric mismatch in different areas in the sheet. The sheet then transforms in a specific way to accommodate this volumetric mismatch. Different patterns of silver nanoprisms and nanodiscs in the sheet are achieved by controlling the delivery patterns of the etchant Cl−. We demonstrate that by designing the distribution pattern of silver nanoprisms and nanodiscs in the sheet, the same hybrid sheet transforms either to a saddle or to a helical twisted shape, while with another type of distribution pattern, it transforms either to a hoof-like or to a boat-like shape under the irradiation of a laser with a wavelength of either 808 nm or 450 nm. We point out that to program arbitrary curvature of the transformed shape of our sheet, the pattern size of silver nanoprisms and nanodiscs (i.e. actuation area) in the sheet needs to be largely reduced, which however limits the heat generated and hence the shape transformations. Factors that affect the sheet's shape transformations are discussed and solutions are suggested to enhance its performance. The hybrid sheet may find applications in soft robotics, for example, as a robotic finger.
研究领域:
材料科学
·
纳米技术
·
软体机器人
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Wei Li,Ting Luo,Changxu Zhu,Bin Zhang,Bingqiang Cao
Graphene/hexagonal boron nitride nanocomposites with different dimensions have great application prospects in the field of lubrication due to their unique layered structure and excellent mechanical properties. However, due to their complex synthesis process, easy agglomeration, and poor stability, graphene/hexagonal boron nitride nanocomposites have not yet been applied in lubricating applications. Herein, a simple and green in situ laser irradiation method is proposed to construct two-dimensional (2D) reduced graphene oxide (rGO) nanosheets and zero-dimensional (0D) hexagonal boron nitride nanosphere 2D/0D nanocomposite (L-rGO/h-BN). During the one-step laser irradiation in liquid, the GO nanosheets were reduced to rGO nanosheets. Meanwhile, the hexagonal boron nitride (h-BN) transformed from nanoflakes to nanospheres via a pulsed laser heating and reshaping process and embedded into the multilayer graphene nanosheets. The spherical h-BN nanoparticles as interlayer support can maintain the 2D graphene with a more stable layered structure, while the insertion of graphene sheets also effectively inhibits the agglomeration of the spherical h-BN nanoparticles. Therefore, a hierarchical 2D/0D layered rGO/h-BN nanocomposite was formed. Importantly, such composite nanoparticles can well disperse in the lubricating oil without significant precipitation for over 30 days and show remarkably improved tribological performance. This is due to the synergistic lubricant effect of the deposition repair effect from rGO nanosheets reducing wear and micro-bearing effect from h-BN nanospheres reducing friction by changing sliding friction into rolling friction.
研究领域:
材料科学
·
润滑工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jiqiang Qiao,Nianyao Chai,Yuzhe Feng,Jiawei Li,Xiangyu Chen,Yunfan Yue,Sheng Li,Zhongle Zeng,Jiakang Zhou,Huan Wang,Xuewen Wang,Wenyu Zhao,Qingjie Zhang
Poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) has garnered significant considerable interest in the field of flexible thermoelectric films owing to its very low thermal conductivity, highly adjustable electrical conductivity ( σ ) and Seebeck coefficient ( S ). However, improving the σ and S of PEDOT:PSS simultaneously remains challenging for achieving efficient thermoelectrics. In this paper, we proposed a two-step process involving femtosecond laser irradiation and ionic liquid (IL) 1-Ethyl-3-MethylImidazolium DiCyAmide treatment to enhance the thermoelectric properties of PEDOT: PSS thin films. This finding revealed that the increase in PEDOT: PSS conductivity was attributed to both laser irradiation and the post-treatment with IL, in which the former enabled the efficient elimination of insulating PSS from the surface of the conductive polymer, the latter further contributed to the decoupling of PEDOT and PSS. The enhanced Seebeck coefficient was due to the ion exchange resulting from IL post-processing, which regulated the PEDOT doping level. By employing laser irradiation and surface treatment with IL, the modified PEDOT:PSS films showed a S of 20.63 μV·K −1 , a σ of 960.7 S·cm −1 , and a power factor (PF) of 40.89 μW·m −1 ·K −2 . Furthermore, a thermoelectric device was developed which can generate a voltage of 0.8 mV at a temperature difference of 11.7 K.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Junfeng Cheng,Xinghua You,Hao Li,Jun Zhou,Zhixiong Lin,Dun Wu,Chunlin Liu,Zheng Cao,Hongting Pu
In recent years, volatile organic compound (VOC) gases have caused potential harm to people's health. This study reveals the preparation of polyethylene porous fiber membrane with excellent low-concentration VOCs filtration performance via laser irradiation technology . A neodymium-doped yttrium aluminum garnet (Nd:YAG) pulsed laser beam was used to scan the laser-sensitive low-density polyethylene/carbon black (LDPE/CB) fibers prepared by nanolayer coextrusion in the air. The controllable thermal energy generated by laser irradiation makes the surface of the fiber membrane to produce a porous carbon layer in situ. Laser power and scanning speed are important parameters for controlling laser-induced carbonization . The results indicate that the rich "fluffy" carbon structures on the surface of the porous fiber membrane can efficiently adsorb xylene gas. This study can provide a positive reference for the large-scale preparation of polyolefin porous fiber membrane with VOCs filtration by simple and efficient laser irradiation method.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 10
·47158
·
IF 1.901
Yu Yang,Minhao Yang,Sumei Zhang,Xiang Lin,Zhi-Min Dang,Dongrui Wang
Dielectrics with the capability to sustain large electric fields and to repair electrical damages rapidly are attracting for advanced insulation systems. Herein we demonstrate, for the first time, polymer blends with a co-continuous structure can heal electrical-breakdown-damage under laser illumination. Polymer blends consisting of polyethylene (PE) and poly(ethylene- co -vinyl acetate) (EVA) plus a small amount of gold nanoparticles (AuNPs) were prepared via a solvent-assisted approach. The co-continuous structure was obtained by controlling the mass ratio of PE/EVA to 50/50 wt %. The PE/EVA blend showed a relatively high dielectric strength of 215 kV mm −1 at room temperature under a direct current electric field. The dielectric strength was slightly reduced to 202 kV mm −1 by incorporating with 0.42 wt % of AuNPs. Importantly, after electrical breakdown, the AuNPs-filled blend films were able to restore their dielectric strength to 80% of the initial values by laser irradiation for seconds. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47158.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Taiping Hu,Pengfei Li,Wei Zhang,Yixing Ye,Jun Liu,Yunyu Cai,Guofeng Zhang,Kai Dai,Changhao Liang
Designing effective catalysts with high performance for electrocatalytic hydrogen production remains a formidable challenge. Small-size bimetallic alloy nanoparticles (NPs) with the advantages of a large exposure of effective active sites and optimal geometric/electronic effects are of great interest in the field of electrocatalysis , yet a suitable strategy for synthesizing such unique structures is still highly expected. In this effort, we report a unique approach to synthesizing ultra-small bimetallic PtM (M=Ni, Co) alloy NPs (∼ 1.7 nm) on carbon supports by laser irradiation in liquids. The method is based on the effective absorption of pulse laser energy by carbon supports to generate instant high temperature, which allows the reduction of metallic ions precursors by ethanol molecules and ensures the subsequent formation of alloy NPs. The fast-cooling dynamic process stops the further growth of small-sized alloy NPs. Such bimetallic PtNi alloy NPs displayed much improved catalytic performance in the HER process. The overpotential is only 19 mV and 42 mV (10 mA cm −2 ) in acidic and alkaline conditions, which is much lower than that of commercial 20 % Pt/C (36 mV, 53 mV) catalyst. Density function theory calculation shows that Ni doping facilitates the hydrogen adsorption/desorption process of nearby surface Pt atoms.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yuqiong Xia,Zhaoxu Chen,Xianghan Zhang,Peng Yang,Zhongliang Wang
Thrombotic cardiovascular diseases remain the leading cause of mortality worldwide. However, current thrombolytic therapeutics suffer from limited efficacy and a high risk of severe bleeding. Here, a phosphatidylcholine liposome accelerated platinum nanomachine (PLANE) for thrombus mechanotherapy is designed, constructed by encapsulating platinum nanomotors within isotropic, lubricating phosphatidylcholine (PC) liposomes. The precisely engineered PLANE exhibits superior lubricity and linear motion. Under laser irradiation and hydrogen peroxide treatment, PLANEs achieve significantly higher velocities than conventional platinum nanomotors, facilitating deep penetration into the thrombi. Further functionalization with thrombus-targeting peptides enables the cPLANEs to selectively accumulate at the thrombotic sites in vivo, demonstrating excellent thrombolytic efficacy. This work presents a novel surface modification strategy for optimizing the motion behavior of platinum nanomotors, offering a promising non-pharmaceutic approach for thrombotic disease treatment.
研究领域:
纳米医学
·
生物材料
·
心血管疾病
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Zhiqiang Bai,Lu Zhao,Haidi Feng,Hui Xu,Nianping Zhang,Yanjun Li,Jinping Song,Yunfeng Bai,Ronghua Yang,Feng Feng
Aptamer (Apt) is a kind of recognition molecule with excellent affinity and high specificity. Transmembrane glycoprotein mucin (MUC1) is an important tumor biomarker overexpressed in MCF-7 tumor cells. MUC1 Apt (Apt-M) could specifically target MCF-7 tumor cells. Ti 3 C 2 nanosheets with high photothermal conversion efficiency were considered as a promising therapeutic nanoplatform for tumor therapy. Doxorubicin (DOX) is a common anti-tumor drug. Herein, a novel DOX/Ti 3 C 2 /Apt-M therapeutic nanoplatform was successfully fabricated, which could specifically target MCF-7 tumor cells. As expected, the temperature of DOX/Ti 3 C 2 /Apt-M therapeutic nanoplatform raised rapidly under laser irradiation. Meanwhile, chemotherapy was triggered through multimodal stimuli-responsive drug release from the DOX/Ti 3 C 2 /Apt-M therapeutic nanoplatform under acidic environment and laser-induced local high temperature. Encouragingly, the MCF-7 cell viability of DOX/Ti 3 C 2 /Apt-M with laser irradiation was only 26.9%. The tumor surface temperature of MCF-7 xenograft mice in the DOX/Ti 3 C 2 /Apt-M + Laser group rose to about 58.3 °C, which was significantly higher than other laser irradiation groups. The experiments in vitro and in vivo indicated that the DOX/Ti 3 C 2 /Apt-M therapeutic nanoplatform can rapidly accumulate in MCF-7 tumors with excellent active targeting properties, and display superior tumor suppressive ability through combination therapy. This work provides a new idea of targeted tumor therapy based on Ti 3 C 2 nanosheets.
研究领域:
纳米技术
·
癌症治疗
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 87
·84269-84275
·
IF 3.289
Ming Liu,Na Xu,Wensen Liu,Zhigang Xie
Core–shell PLGA@Polypyrrole nanoparticles (PLGA@PPy NPs) were prepared by polymerization of pyrrole on the surface of PLGA nanoparticles (PLGA NPs). Curcumin (Cur) as a chemotherapeutic agent was encapsulated into PLGA NPs, and used to synthesize the PLGA (Cur)@PPy NPs. Uniform structure and sustained release of Cur has been demonstrated. PLGA@PPy NPs still retain the ability of a photothermal effect upon laser irradiation. This PLGA@PPy NPs could be internalized by cancer cells by endocytosis, and indicate the potent cytotoxicity. Combining the photothermal therapy, the Cur loading PLGA@PPy NPs show enhanced cytotoxicity compared to single chemotherapy or photothermal therapy. This core–shell PLGA@PPy system could be potentially used as a universal drug delivery platform for combination therapy.
研究领域:
纳米技术
·
药剂学
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Xinyu Xu,Yujie Ding,Roja Hadianamrei,Songwei Lv,Rongrong You,Fang Pan,Peng Zhang,Nan Wang,Xiubo Zhao
Photothermal therapy using laser activated gold nanorods (AuNRs) is a strategy for treatment of bacterial infections. Nevertheless, it also exerts cytotoxicity against human cells which leads to adverse effects in healthy human tissues and limits the applicable dose. Functionalization of AuNRs with a selective antimicrobial peptide (AMP) with higher selectivity for bacteria over human cells is a promising strategy for increasing the selectivity of the AuNRs for bacteria, hence increasing their cellular uptake by the bacteria in order to achieve stronger antimicrobial effects with lower doses of AuNRs without damaging the human cells. In this study, the surface of AuNRs was functionalized with a short AMP named C-At5 and the efficiency of the peptide functionalized AuNRs in killing gram-positive and gram-negative bacteria was evaluated in vitro as well as their potential for facilitating wound healing in a mouse model of wound infection with and without application of laser. The peptide-conjugated AuNRs exhibited higher antibacterial activity in vitro compared to the plain AuNRs both in the presence and absence of laser irradiation. Furthermore, [email protected] had very low toxicity against human skin fibroblasts and human red blood cells indicating their higher biocompatibility compared to the plain AuNRs. Treatment of wounded mice with [email protected] accelerated the wound healing process which was further enhanced by applying laser. The system developed in this study has great potential for customization for specific antimicrobial or antifungal therapy via conjugation of different types of AMPs with higher selectivity and can therefore serve as a guide for any future attempts in this regard.
研究领域:
纳米技术
·
生物医学工程
·
药学
·
伤口愈合
·
传染病
✓ 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）