CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yehong Zhang,Xiangyu Li,Zhidong Pan,Shanjun Ke,Yanmin Wang
This paper was to synthesize praseodymium-doped neodymium molybdate allochroic pigments with different molar ratios of molybdenum (Mo), neodymium (Nd) and praseodymium (Pr) through solid-state reactions. The pigments synthesized were investigated by X-ray diffraction (XRD), selected area electron diffraction (SAED), thermogravimetry and differential thermal analysis (TG-DSC), diffuse reflectance spectroscopy , X-ray photoelectron spectroscopy (XPS) and colorimeter. The results show that a pure neodymium molybdate (i.e., Nd 2 MoO 6 ) can be formed after sintering at 1000 °C for 3 h, and praseodymium-doped neodymium molybdate can be synthesized after sintering at 1000 °C for 3 h due to praseodymium ions entering in the lattice of Nd 2 MoO 6 . The crystal structure in the pigment synthesized can transform from cubic to tetragonal depending on the molar ratio of neodymium/molybdenum and sintering procedure. The color properties of pigments were measured in color space CIE L*a*b* under different standard illuminants (i.e., solar-light (D65), incandescent light (A), cool white fluorescent lamp (F2), and three-band fluorescent lamp (F11)). The results show that the colors of the pigments vary under different illuminants. According to the color difference (Δ E ) analysis, neodymium molybdate pigment exhibits a maximum color difference of 10.69, and the maximum color difference of praseodymium-doped neodymium molybdate pigment with doping content of 0.2 increases to 17.63 due to the Pr 3+ ions substitution for Nd 3+ ions in the lattice. In addition, the color difference of the pigments with allochroic effect was discussed based on the colorimetry. The color difference of the pigments is due to a high reflectance region at 540–550 nm and a low reflectance region at 380–500 nm.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Yuying Du,Yuanyuan Gao,Yanlong Gu,Li Lv,Ning Zhu,Limin Han,Xing Zeng
Owing to the diverse implication of carbazole scaffolds in medicinal chemistry, photoelectronic materials and chromophores, the molecules containing the carbazole motif have attracted significant attention over the years. In this work, the vibronic contributions to carbazole structures could facilely change the solvatochromic effect, absorption wavelength, emission wavelength, and Stokes shifts of six 2-carbonyl carbazole ketones fluorophores. Among them, the structure of 1-(1-methyl- 9H -carbazol-2-yl)ethanone (3a) were confirmed from single crystal XRD studies. The ratiometric detection of Fe(III) ion of 2-carbonyl carbazole ketone 3a were investigated. Furthermore, it was speculated that chemosensor 3a toward the recognition of Fe 3+ cation was dependent on its rigid structure and good coplanarity of the conjugated system, strong intramolecular charge-transfer of 3a .
研究领域:
有机化学
·
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Linghui Shen,Tong Wei,Yongchao Shi,Hanyu Hao,Si Chen,Jiaguang Chen,Hao Guan,Qingjun Zhou,Zepeng Li
The various applications of luminescence materials were generally based on the effective modulation of luminescence spectra. However, the research on reversible spectral regulation of up-conversion (UC) luminescence materials was still in its infancy stage. In this work, a class of smart phosphor, Er 3+ and Yb 3+ -codoped SrBi 8 Ti 7 O 27 (SBYT: xEr 3+ ) intergrowth bismuth layer-structured ferroelectric , possessing fast sensitivity to visible light irradiation, was reported based on visible light driven photochromic effect. Through the alternate stimuli of light irradiation and heating treatment, the reversible regulation of UC luminescence was achieved accompanying with the switching of coloration and decoloration processes. The luminescence modulation degree tightly relied on the irradiation time and thermal treatment modes. The reversibility and stability properties were also revealed. Moreover, it is found that polarization treatment was an effective approach which can be adopted to improve the UC luminescence contrast. The maximum luminescence modulation ability of SBYT: xEr 3+ reached up to 81.3% which was 131% of that un-polarized sample. It is believed that SBYT: xEr 3+ ceramics can act as a promising candidate for optical data storage and anti-counterfeiting applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Chuanjun Yuan,Ming Li,Meng Wang,Yuanyuan Dan,Tianchun Lin,Haijun Cao,Mengjie Zhang,Peng Zhao,Hui Yang
Latent fingerprints are one of the most important trace evidences at crime scenes that can be used for individual recognition. The invisible nature of latent fingerprints gives rise to various kinds of development and imaging techniques, among which a number of electrochemical methods are receiving increasing attention. We report herein a new interfacial strategy based on spatially selective electrodeposition of Co 3 O 4 films with electrochromic properties to develop and enhance latent fingerprints on stainless steel surfaces. During the development process by potentiostatical deposition of Co 3 O 4 on the background, image contrast and development accuracy as two key factors that measure the effectiveness of fingerprint development are systemically evaluated from millimeter to microscopic scales. Three levels of morphological features in latent fingerprints can be well developed. Optical properties of deposited Co 3 O 4 films can be reversibly adjusted by changing applied potential. This phenomenon is analyzed qualitatively through visual appraisal and determined quantitatively by using color channels. The results indicate that image enhancement of developed fingerprints can be easily accomplished by extracting the blue channel of captured images. Forensic DNA typing is also performed to reveal the impact of this method on DNA evidence in fingerprint residues. The ratio of detected loci reaches 80.9% after electrochemical process. This novel method has advantages including high development accuracy, adjustable image contrast, and relatively non-destructive to DNA analysis.
研究领域:
法医学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Rui Gong,Feng Wang,Jin Cheng,Yani Lu,Renchao Hu,Hongjie Huang,Baofu Ding,Hong Wang
Hydrochromic materials undergo magical color changes when interacting with water and are receiving widespread attention for their frontier applications such as sensing and information security. The hydrochromic effect is observable in perovskite materials via the mechanism of water-induced fluorescence quenching. However, due to water isolation, achieving a hydrochromic effect in perovskite-polymer composite remains elusive, notwithstanding its importance as a potentially commercial-ready material. Here, we demonstrate a hydrochromic effect of perovskite-polymer-based porous composite via a nonsolvent-induced phase separation method, comprising of FA2PbBr4/poly(vinylidene fluoride) (FA = formamidinium). The naturally formed pores serve as microchannels, facilitating moisture diffusion. The penetrated water induces a phase transition of perovskite material from the nonfluorescent two-dimensional FA2PbBr4 to the fluorescent three-dimensional FAPbBr3. This work has developed the hydrochromic perovskite-polymer composites, enabling various commercial-ready chromatic applications as conceptually demonstrated custom-made fingerprint labels, quick response code anticounterfeiting labels, encrypted document protections, and water-ink inkjet printing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Peng Wang,Jinfeng Lin,Xiao Wu,Chunlin Zhao,Min Gao,Cong Lin,Qiwei Zhang
Most photochromic ceramics can back up post-irradiation to achieve color state transition. Unfortunately, color recovery usually requires exposure of material to external physical fields (such as light and heat), which severely limits the application as a convenient energy building material such as smart windows. Here, we report a kind of sodium niobate translucent ceramics whose photochromic effect can be completely self-recoverable without any external physical field stimulation. Based on the analysis of time-response transmittance, up-conversion emission spectra and thermoluminescence spectra, the behavior of carrier migration and trap capture/release in the process of self-recovery photochromic reaction has been proposed. It is believed that the emergence of intermediate trap level is an important factor to produce this spontaneous behavior. Moreover, by controlling the amount of rare earth doping and designing two types of materials with different carrier behaviors, Sm/Er-codoped NaNbO 3 ceramics are regarded as an appropriate candidate for tracing the time of light irradiation and intelligent regulation of smart building materials. This work can promote the fundamental understanding and practical applications of self-recoverable photochromic bulk materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Yun Yuan,Leilei Wu,Biaobiao Yan,Yuanyuan Yu,Qiang Wang,Ping Wang
Carbon quantum dots (CQDs) have attracted more attentions due to their multiple performances. However, the fabrication of long-wavelength emitting CQDs with aliphatic precursors still remains a challenge, mainly because it is difficult to generate large sp 2 domains to reduce energy gap, which is not conducive to a redshift of the luminescence peak. Hereon, by regulating the pH of citric acid and thiourea mixture, a N, S co-doped CQD emitting bright red fluorescence at 635 nm is successfully fabricated through the solvothermal reaction under acidic condition, achieving a high quantum yield of 32.66%. Solvatochromic effects of the CQDs are discussed through theoretical equations and models, which confirm that the hydrogen-bonding interaction dominates the fluorescence emission behavior of CQDs in polar solvents. Besides, a feasible strategy is proposed to prepare an anti-counterfeiting textile via the deposition of red-emitting CQDs onto cotton fibers, through rapidly evaporating the preferred organic solvent. As expected, the CQD-decorated textiles exhibit encouraging anti-counterfeiting and security-warning functions, along with underwater and long-distance detectability, washability, and sun resistance. It is worth noting that the present work is innovative in realizing the application of red-light-emitting CQDs in the fields of security-warning textiles.
研究领域:
材料科学
·
光学
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Yonghong Deng,Youfa Liu,Yong Qian,Weijian Zhang,Xueqing Qiu
Lignin-based azo polymers are prepared from alkali lignin, a byproduct in spent liquor from the pulping and papermaking industry, and their structures and photochromic effects are characterized by elemental analysis, Fourier transform infrared, 1H nuclear magnetic resonance, and ultraviolet–visible spectroscopy. Results show that only the 2-(4-nitrophenyl azo) phenol lignin-modified polymer (AL-azo-NO2) shows a significant photochromic effect, and its photoresponsive behavior is evidently slower than that of the synthetic polymer with a similar azo chromophore. For the 2-(4-methoxyphenyl azo) phenol lignin-modified polymer, its photoisomerization behavior was expected to be similar to that of azobenzene-type molecules, but its photoresponse is not obvious. The abnormal photochromic effect of AL-azo polymers is related to strong steric hindrance of lignin backbones. With addition of water (poor solvent), AL-azo-NO2 shrinks gradually, which prevents azobenzene groups from isomerizing and results in a lower isomerization efficiency at higher water contents. Preparation of lignin-based azo polymers offers a novel source of azo polymers and provides a green and sustainable pathway for value-added utilization of lignin biomass recovered from the pulping industry.
研究领域:
材料科学
·
绿色化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2756-2766
·
IF 5.934
Fengming Yang,Bing Jia,Tong Wei,Chuanzhen Zhao,Qingjun Zhou,Zepeng Li,Mingrun Du,Mingchao Wang,Yiyang Liu,Chanying Xie
Reversible upconversion (UC) luminescence modulation by external stimuli (i.e. electric field, magnetic field, and light irradiation) is extremely attractive for applications in a broad range of fields, such as photoswitches, high-density optical data storage devices, and optical sensing. In this work, one kind of novel phosphor, Er3+-doped Bi4Ti3O12 (Bi4−xErxTi3O12) ceramics, prepared by a conventional solid-state reaction approach, is reported which exhibits both bright UC luminescence and a remarkable photochromic (PC) effect. The UC luminescence, PC effect, and the coupling between UC and PC performances were investigated in detail. It is found that the UC luminescence could be readily modulated by alternating visible light irradiation and a thermal stimulus, and a large reversible luminescence regulation has been achieved based on the PC reaction. Meanwhile, the modulation of UC luminescence was shown to tightly depend on the irradiation time and thermal treatment processes. In addition, the coloration and decoloration processes also exhibited good fatigue resistance. The mechanisms related to the UC emissions, PC processes, and luminescence modulation are also discussed. These results indicated that Bi4−xErxTi3O12 samples could be potentially utilized as a kind of optical data storage material.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Luyang Miao,Chengzhou Zhu,Lei Jiao,He Li,Dan Du,Yuehe Lin,Qin Wei
Numerous analytical techniques have been undertaken for the detection of protein biomarkers because of their extensive and significant applications in clinical diagnosis, whereas there are few strategies to develop dual-readout immunosensors to achieve more accurate results. To the best of our knowledge, inspired by smart drug delivery system (DDS), a novel pH-responsive modified enzyme-linked immunosorbent assay (ELISA) was innovatively developed for the first time, realizing dual-modal colorimetric and fluorescent detection of cardiac troponin I (cTnI). Curcumin (CUR) was elaborately selected as a reporter molecule, which played the same role of drugs in DDS based on the following considerations: (1) CUR can be used as a kind of pH indicator by the inherited allochroic effect induced by basic pH value; (2) the fluorescence of CUR can be quenched by certain nanocarriers as the acceptor because of the occurrence of fluorescence resonance energy transfer (FRET), while recovered by the stimuli of basic pH value, which can produce “signal-on” fluorescence detection. Three-dimensional MoS2 nanoflowers (3D-MoS2 NFs) were employed in immobilizing CUR to constitute a nanoprobe for the determination of cTnI by virtue of good biocompatibility, high absorption capacity, and fluorescence quench efficiency toward CUR. The proposed DDS-inspired ELISA offered dual-modal colorimetric and fluorescent detection of cTnI, thereby meeting the reliable and precise analysis requirements. We believe that the developed dual-readout ELISA will create a new avenue and bring innovative inspirations for biological detections.
研究领域:
生物分析
·
医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Yunfan Zhang,Jialin Liu,Jingbo Zhao,Zhiyuan Zhang
A new and simple method was established to prepare polyamides with a chelating feature through Michael addition and polycondensation . A piperazine-diester monomer , that is, N,N´-bis(methyl propanoate) piperazine (BMPZ), was synthesized through a Michael addition of piperazine and methyl acrylate . Three polyamides containing piperazine rings (PIP-PAs) were synthesized via melt polycondensation from BMPZ and different diamines. PIP-PAs were modified by chelating Co 2+ , and several PIP-PA-Co 2+ complexes were obtained. The structure of BMPZ and PIP-PAs was characterized by FT-IR and 1 H NMR spectra. DSC and wide angle X-ray diffraction verified the crystallizable feature of PIP-PAs. They possessed T m from 81 °C to 171 °C, tensile strength up to 31 MPa, and good toughness. Chelating PIP-PAs with Co 2+ was accompanied by color change and the loss of crystallization. The effect of chelation on T g , tensile strength, and Young's modulus was investigated. Polyamide complexes with good mechanical property and solvatochromic feature were synthesized successfully.
研究领域:
聚合物化学
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tian Yin,Sheng Chen,Xiaodong Lu,Jianping Ge
Structural-colored thermal printing using the “photonic crystal/phase change material” (PC/PCM) composites as thermal paper is a promising and feasible technique, which possesses superior color stability against chemicals and green characteristics for humans and the environment. However, there are still great challenges to limit its application, including the incapability of multi-color printing, unsatisfactory resolution, and limited greyscale levels. Here, a laser-assisted thermal printing process is developed based on the photothermal conversion from the laser irradiation and the thermochromic effect of the PC/PCM composites. Thanks to the intense laser heating in a small range, fine patterns with practical/theoretical resolution as high as 275/879 DPI can be obtained under fast laser scanning. Using precise control of the laser intensity or the visual fusion of microdots with tunable size and number, 36 greyscale levels are realized by “photomask” or “halftone” strategies. Multicolor patterns are fabricated by stacking the separately printed RGB sub-images, which vertically mix two or three of the RGB colors to produce abundant colors. Based on the tomographic deconstruction of the source image, a clear structural-colored pattern can be printed on the curved substrate by continuous tuning of the laser focal plane and multi-step laser printing on each slice.
研究领域:
光学工程
·
材料科学
·
纳米技术
·
印刷技术
·
光子学
·
热物理
✓ 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）