CERAMICS INTERNATIONAL
·
2014
·
IF 2.086
T. Li,Z. Ma,L. Liu,S.Z. Zhu
Rare-earth zirconate is one of the most promising candidate materials for the next generation thermal barrier coatings . However, at high temperatures the thermal conductivity of the rare-earth zirconate increases because of radiation. NiCr 2 O 4 , which can absorb the infrared photons intensely, was introduced to reduce the radiative thermal conductivity of Sm 2 Zr 2 O 7 . NiCr 2 O 4 and Sm 2 Zr 2 O 7 powders were prepared by coprecipitation method. The bulks of Sm 2 Zr 2 O 7 – x vol% NiCr 2 O 4 ( x =0, 5, 10, 15 and 20) composites were prepared by non-pressure sintering. The phase, microstructure and composition of the samples were characterized. The absorptivity and the thermal conductivity of the composites were also tested. The absorptivity of the composites was enhanced as increasing the content of NiCr 2 O 4 . The total thermal conductivities of the composites were higher than that of pure Sm 2 Zr 2 O 7 , but the recovery of the thermal conductivity of rare-earth zirconate was relived or disappeared in the testing temperature range.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2109891
·
IF 18.808
Ganghong Liu,Zehao Zhang,Cuncun Wu,Yuqing Zhang,Xiangdong Li,Wenjin Yu,Guangjie Yao,Shiming Liu,Jun-jie Shi,Kaihui Liu,Zhijian Chen,Lixin Xiao,Bo Qu
The toxicity of lead-based halide perovskites hampers broad application in optoelectronics. Lead-free perovskite Cs 2 AgBiBr 6 is considered a promising candidate, owing to the long carrier lifetime and great stability. However, the relatively large bandgap of 1.98 eV limits its absorption in the visible region. Herein, Fe 2+ is chosen as the dopant to alloy into Cs 2 AgBiBr 6 single crystals, and results in an absorption range broadening to ≈1350 nm, which is the longest near-infrared (NIR) response recorded among lead-free perovskites. About 1% of Fe ions are alloyed into the Cs 2 AgBiBr 6 lattice to cause lattice shrink age. Instead of narrowing the bandgap, Fe doping would introduce a new intermediate band inside the pristine bandgap of Cs 2 AgBiBr 6 to strongly absorb NIR light, as confirmed by third harmonic generation results. Moreover, considerable photogenerated carriers are produced in Fe doped Cs 2 AgBiBr 6 crystals with NIR irradiation. This work has provided a new way to extend the optical response of lead-free perovskites for NIR photodetectors and intermediate band photovoltaics.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Theranostics
·
2019
·
IF 8.063
Duyang Gao,Boyu Zhang,Yubin Liu,Dehong Hu,Zonghai Sheng,Xuanjun Zhang,Zhen Yuan
Background : Engineering a single organic-molecule-based nanoparticle integrating precise diagnosis and effective therapy is of great significance for cancer treatment and future clinical applications but remains a great challenge. The goal of this study is to explore small organic molecule-based nanoparticles with high photothermal conversion efficiency for photoacoustic imaging-guided therapy. Methods : Heptacyclic B, O-chelated BODIPY structure (namely Boca-BODIPY) with strong near-infrared (NIR) absorption was designed as a theranostic agent through simply molecular engineering, in which heavy atoms and alkyl chains were introduced to promote its application for tumor theranostics. The Boca-BODIPY molecules are further encapsulated in reduced bovine serum albumin (BSA) through self-assembly. Results : The BSA-Boca-BODIPY exhibited excellent biocompatibility, extraordinary stability and high photothermal conversion efficiency up to 58.7%. The nanoparticles could dramatically enhance photoacoustic contrast of the tumor region, and the signal-to-noise ratio was increased about 14 times at 10 h post intravenous injection in 4T1 tumor-bearing mice. In addition, the nanoassemblies can efficiently convert laser energy (808 nm, 0.75 w cm -2 , 5min) into hyperthermia for tumor ablation. Under the photoacoustic imaging-guided photothermal therapy (PTT), the 4T1 cancer cells were efficiently killed, no tumor recurrence and PTT-induced toxicity is observed. Conclusions : Molecular engineering is a promising way to design organic-molecule-based nanoparticles for cancer theranostics. Other organic-molecule-based nanoparticles which show great promise for imaging-guided cancer precision therapy can be engineered through this method.
研究领域:
生物医学工程
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癌症治疗学
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分子影像学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 22
·2200646
·
IF 15.153
Yanhua Zhu,Xinfeng Tang,Qian Liu,Yujian Xia,Xingwu Zhai,Hui Zhang,Delong Duan,Hang Wang,Wenqi Zhan,Liang Wu,Nan Zheng,Weifu Lv,Yucai Wang,Min Zhou
Photothermal therapy (PTT) as a noninvasive hyperthermia exhibits high potential for anti-cancer treatments. The explosion of efficient photothermal agents (PTAs) keeps developing rapidly. MXene stands out due to its intriguing structures, fantastic photodynamic properties, and good biocompatibility. However, the potential of MXenes has not been sufficiently explored in PTT. Its versatile chemical compositions of MXenes provide vast opportunities to discover new candidates. Considering that the metallic feature is mainly attributed to the metal element, anionic modulation may open a distinct avenue to propel efficient PTAs with metallic nature, which is expected for high light-harvesting over near-infrared (NIR)-I and NIR-II. As a paradigm, metal carbonitride is chosen to visualize the influences of anionic modulation. Taking advantage of electron injection from nitrogen, the distinct carbonitride Ti 3 C 1.15 N 0.85 F 0.88 O 0.56 (OH) 0.56 exhibits a strong NIR absorption (36.6 L g −1 cm −1 at 808 nm, 43.5 L g −1 cm −1 at 1064 nm), resulting in efficient photonic hyperthermia against tumors in vitro and in vivo. Looking through a large family of MXenes, this proof-of-principle demonstration offers a deep understanding between atomic composition and physicochemical properties, which further solidifies MXenes with all the potential for biomedical applications.
研究领域:
生物医学工程
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材料科学
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肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Wang Dong,Cheng Qikuan,Xia Weibang,Tan Yongyao,Yu Kexuan,Zhang Lu,Li Guigang,Liu Rong,Wang Wei,Xu Linjuan,Wu Suli,Liu Yang,Wang Yunming,Zhou Huamin
Constructing micro-/nanostructure-modulated photofields in upconversion devices to absorb low-energy photons and emit high-energy light is revolutionary for bioimaging, lasers, and photovoltaics, with proven capability to boost upconversion luminescence (UCL) by orders of magnitude. However, photoenergy dissipation and inadequate absorption result in excitation thresholds exceeding 1 mW/cm 2 , which exceeds retinal safety limits and hinders wearable upconversion optics. Here, we report the use of upconversion core-shell microsphere-induced infrared field convergence, NaYF 4 :Yb,Er shell-based resonant cavities for multiple reflection-absorption-upconversion and photonic crystal amplifiers to improve UCL intensity three orders of magnitude, and achieve ultralow threshold (0.0025 mW/cm 2 ). The 500 nm upconversion core-shell microspheres generated 1200-fold stronger electric field through concentrated photofield and attained 8-fold infrared absorption with a forward/backward emission ratio of 150. Fabricated upconversion contact lenses significantly improved dark-light imaging clarity and vision restoration in retinal degeneration rabbits. Microsphere-mediated directional upconversion strategy maximizes photoenergy utilization, paving the way for high-performance wearable upconversion devices.
研究领域:
生物医学工程
·
光学材料
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 22
·8620-8626
·
IF 3.069
Chengkang Su,Huiqing Zhong,Haolin Chen,Yanxian Guo,Zhouyi Guo,Deqiu Huang,Wen Zhang,Qiang Wu,Biwen Yang,Zhiming Liu
The favorable biocompatibility, biodegradability and broadband absorption in the ultraviolet to near-infrared (NIR) region have made black phosphorus (BP) a new generation two-dimensional nanomaterial with great potential for photothermal therapy (PTT). However, an appropriate but not low dosage of nanoagent is required to achieve the satisfactory therapeutic effect in BP-based NIR PTT, due to the decreasing light absorption of BP in the NIR region. In this work, nanohybrids composed of BP nanosheets and several polypyrrole (PPy) nanoparticles attached to them (BP/PPy NSs) are fabricated for high-performance NIR PTT, benefiting from the superimposed NIR absorption characteristics of the two components. The nanocomposites exhibit irregular, speckled and flake-like morphologies with good biocompatibility and superior NIR photothermal transduction efficiency compared with that of the bare nanosheets. The utilization of BP/PPy NSs as novel nanotherapeutic agent for enhanced NIR photothermal cancer therapy is accomplished in vitro and in vivo.
研究领域:
生物医学工程
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癌症治疗
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纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Yanting Shen,Xue Zhang,Lijia Liang,Jing Yue,Dianshuai Huang,Weiqing Xu,Wei Shi,Chongyang Liang,Shuping Xu
Carbon dots (CDs) have been widely used in biological research including bioimaging, biosensing, and biomedicine because of their excellent biocompatibility. However, inefficient absorption of these CDs in the visible-to-near-infrared window limits their applications for photo-sensitive cancer therapeutic strategies and in vivo imaging. Herein, novel supra-carbon dots (SCDs, approximately 20 nm) with high visible-NIR absorption, large photothermal efficiency, and specific cancer cell and mitochondria-targeting feature were prepared by the self-assembly of small-sized CDs (approximately 5 nm) under an acidic environment, followed by modification of cancer cell- and mitochondria-targeting peptides. These targeting SCDs were applied for precisely damaging cancer cells by an NIR photothermal therapy (PTT), and the viability rate difference between the cancer and normal cells is as large as 70%, indicating high specificity and high selectivity. In addition, the destruction of mitochondria was observed by confocal fluorescence microscopy, and the real-time dynamics of the cellular molecules during this process were further evaluated by surface-enhanced Raman spectroscopy. The results reveal that the produced hyperthermia may first incite structural changes in lipid, protein, and deoxyribonucleic acid and then induce cell death. Our results are helpful for the preparation of new CDs-based photothermal materials and the development of more efficient photothermal therapeutic platforms.
研究领域:
生物医学
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材料科学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Tian Junlong,Zhang Wang,Huang Yiqiao,Liu Qinglei,Wang Yuhua,Zhang Zhijian,Zhang Di
A carbon-matrix nickel composite magnetoplasmonic film with a 3D sub-micron periodic triangular roof-type antireflection structure (SPTAS) was fabricated via a simple and promising method that combines chemosynthesis with biomimetic techniques. The Troides helena (Linnaeus) forewing (T_FW) was chosen as the biomimetic template. The carbon-matrix Ni wing fabricated via electroless Ni deposition for 6 h (CNMF_6h) exhibits enhanced infrared absorption. Over a wavelength range (888–2500 nm), the enhancement of the infrared absorption of CNMF_6h is up to 1.85 times compared with the T_FW. Furthermore, infrared excitation induces a photothermal effect that results in variation in the magnetic properties of the carbon-matrix Ni wing. The magnetic properties were also confirmed using atomic force microscopy (AFM) and magnetic force microscopy (MFM). The good correlation between the AFM and MFM images demonstrates that the surface of the SPTAS of CNMF_6h exhibits strong magnetic properties. The infrared induced photothermal effect that results in magnetic variation is promising for use in the design of novel magnetoplasmonic films with potential applications in infrared information recording and heat-assisted magnetic recording.
研究领域:
材料科学
·
光学
·
磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2020
·
IF 14.612
Shangqian Zhu,Xueping Qin,Yao Yao,Minhua Shao
The origins of the pH-dependent kinetics of hydrogen evolution and oxidation reactions on Pt surfaces are unsolved dilemmas that have lasted for over half a century. In this study, surface-enhanced infrared absorption spectroscopy is applied to directly monitor the vibrational behaviors of adsorbed hydrogen atoms and interfacial water molecules on Pt surfaces in a wide pH window from 1.1 to 12.9. For the first time, we successfully measure the pH-dependent changes of hydrogen and water binding strength according to their vibrational wavenumbers, which are both monotonously weakened as the solution pH increases. Their changes are the net results of altered electrochemical interface environments and are important contributions to the pH-dependent hydrogen reaction kinetics. Our results add significant new insights into the role of interfacial environments on electrocatalysis.
研究领域:
电化学
·
催化科学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Xiaona Bu,Huijie Wang,Fang Zhang,Qixian Li,Jingru Zhu,Juan Ding,Jie Sun,Yang Liu,Tingting Jiang
One challenge in the field of photothermal therapy (PTT) is to design an assembly of carbon nanodots (CNDs) with enhanced light absorption in the near-infrared (NIR) spectral region and improved photothermal conversion efficiency. Herein, a type of CND assembly was fabricated using a covalent click reaction in a water-in-oil emulsion system (abbreviated as W/O assembly), providing excellent stability, controllable size distributions, enhanced NIR absorption, and improved applications in photothermal imaging (PTI), photoacoustic imaging (PAI), and PTT. A mechanism based on energy dissipation was proposed in detail to explain the changes in photophysical properties before and after CND assembly. In addition, an outstanding antibacterial effect was also observed during the in vitro phototherapy of drug-resistant pathogens. Importantly, the results of in vivo infection assays further verified satisfying photokilling effect toward drug-resistant bacteria and excellent biosafety to normal cells and tissues. Given the benefits of the covalent CND assembly developed in this work, it might have potential applications in the following aspects: (1) strategy of the controllable covalent assembly could be extended to other nanosystems and (2) in situ CND assembly could be built at disease sites based on microenvironment-triggered bioorthogonal click reactions, improving targeting performance and reducing the side effects of PTT.
研究领域:
材料科学
·
医学
·
纳米生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 1
·1-10
·
IF 3.097
Bao Li-hong,Liu Zhan-hui
A series of near infrared absorption photothermal conversion polyurethane (PTPU) was synthesized with a cyanine dye to act as near infrared absorption component and polyethylene glycol 10,000 (PEG10000) to act as phase change material (PCM). The light resistant, pH dependence of dye and the effect of PEG10000 content on the properties of PTPU were investigated. The results showed that the cyanine dye had good light stability and was sensitive to pH, so a saturated solution of boric acid was added in the synthesis of PTPU to adjust its pH to 6 ~ 7. The crystalline degree of PTPU increased and its thermal stability decreased with the increasing of PEG10000 content; the light absorption of PTPU was mainly determined by the dye; the photothermal conversion efficiency and energy storage capability of PTPU increased with the increasing of PEG10000 and the PTPU can reach a higher temperature under illumination comparing to control polyurethane (PU); the PTPUs underwent a solid–solid phase change process and had excellent durability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 17
·3296-3300
·
IF 3.879
J. M. Xu,L. Li,S. Wang,H. L. Ding,Y. X. Zhang,G. H. Li
The influence of Sb doping on the structural and optical properties of the SnO2 nanocrystals and films were investigated. An unusual enhancement in near infrared absorption was found in the SnO2 nanocrystals with increasing Sb doping content, and the maximum absorption shifted to shorter wavelength.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）