CRYSTAL GROWTH & DESIGN
·
2022
·
IF 4.01
Yu Liu,Peng Yang,Keke Zhang,Jun Xu,Songgu Wu,Junbo Gong
Mechanical flexible organic crystals with optical properties have attracted increasing research interest, because of their unusual phenomena and broad application prospects. However, achieving both plasticity and luminescent properties in organic crystals is difficult. Here we report a plastic organic crystal, flufenamic acid (FFA) form III crystal, which shows highly plastic bending along (001) face and hand-twistable behavior under applied external force. It also illustrated a unique bending mechanofluorochromism behavior. In summary, the proposed soft single crystal with mechanical induced fluorescence modulation appears to be of interest to the design of future tunable fluorescent materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Xiaoling Niu,Xiaojing Wu,Heng Zhou,Yongliang Liu,Zhen Feng,Min Tian,Shengbo Zhu
A novel aggregation-induced emission (AIE)-active liquid crystal of DC-DBM bearing rod-like dicyanodistilbenic (DC) core and alky chain was synthesized by Knoevenagel condensation reaction. It shows remarkable AIE and liquid crystal properties, and undergoes obvious mechano- and thermo- fluorochromic behaviors. The color of DC-DBM changed from green to light-yellow after grinding, and returned after fuming with organic solvent under UV light. It also took a smart response upon temperature accompanying with obvious change of colors. The force and temperature responsive phenomena were all associated with changes in the modes of molecular packing and phase states. The stimuli-responsive mechanism were unveiled by powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC). Moreover, DC-DBM displayed electro-tunable character of luminescence after mixing it with the nematic liquid crystal of 5CB. The fluorescent emission intensity with voltage showed a linear relationship from 10 to 30 V. The results showed that the AIE-active liquid crystal was a multi-function fluorescence material, which could be used in the fields of mechano-sensors, temperature detectors, security encryption and displays.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Danhua Guo,Huijun Li,Zhouqing Xu,Yujie Nie
A smart fluorescent pyrene-based MOFs ( HPU-26 ) was synthesized by the solvothermal method, which possessed multi-stimuli-responsive properties and could detect water content in common organic solvents . The reversible multicolor fluorescent switching between yellowish green and cyan were observed under the stimulation of force, heating, and acid-base vapors. PXRD pattern, DSC curve, FI-IR spectra and the solid-state UV–vis absorption spectra were conducted to prove that the changes of π - conjugation induced the transformations between excimer and monomer formation under external stimulation, thus resulting in different fluorescent properties. In addition, HPU-26 could realize the detection of water content by remarkable change of fluorescent color from yellowish green to blue with increasing the water content in common organic solvents, which was attributed to the decomposition of crystal structure. The limit of detection (LOD) values of HPU-26 for detecting the water content in EtOH, DMA, Acetone and ACN were determined as 0.0260 %, 0.0578 %, 0.1978 %, and 0.5637 % (v/v), respectively. Furthermore, HPU-26 could be applied in advanced anti-counterfeiting and convenient visual detection of water content in common organic solvents by smartphone-based software.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Gang He,Linlin Du,Yongyang Gong,Yuanli Liu,Chuanbai Yu,Chun Wei,Wang Zhang Yuan
Mechanochromic luminogens are of significant importance in both academic and technical aspects. Thus far, most mechanochromic compounds exhibit bathochromically shifted emission upon grinding; the examples of those that exhibit blue-shifted emission still remain limited. Herein, a donor–acceptor–donor (D–A–D)-structured conjugate, namely 4,7-di(2-thienyl)-2,1,3-benzothiadiazole (DTBT), comprising benzobis(1,2,5-thiadiazole) and thiophene units, has been carefully synthesized and investigated. DTBT exhibits typical intramolecular charge transfer (ICT) characteristics, crystallization-induced phosphorescence (CIP), and remarkable mechanochromism. Although it merely emits fluorescence in solutions with distinct ICT features, its crystals demonstrate bright-red room-temperature phosphorescence (616 nm) with efficiency up to 25.0% and generate yellow excimer fluorescence (578 nm) upon mechanical grinding, accompanying decreased lifetimes from 10.9 μs to 3.5 ns and a blue-shifted emission of 38 nm. These results highly indicate the feasibility to fabricate novel CIP luminogens with blue-shifted mechanochromism.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 36
·2205325
·
IF 17.521
Chang Sun,Shuoning Zhang,YunXiao Ren,Jianying Zhang,Jiyuan Shen,Shengyu Qin,Wei Hu,Siquan Zhu,Huai Yang,Dengke Yang
The ability of some animals to rapidly change their colors can greatly improve their chances of escaping predators or hunting prey. A classic example is cephalopods, which can rapidly shift through a wide range of colors. This ability is based on the synergetic effect of the change of pigmentary and structural colors exhibited by their own two categories of color-changing cells: supernatant chromatophores offer various pigmentary colors and lower iridophores or leucophores reflect the different structural colors by adjusting their periodicities. Here, a mechanochromic liquid crystalline elastomer with force-induced synergetic pigmentary and structural color change, whose mechanosensitivity is enhanced by the stress-concentration induced by the doped nanoparticle, is presented. The materials have a large color-changing gamut and high mechanochromic sensitivity, which exhibit great potential in the field of mechanical detectors, sensors, and anti-counterfeiting materials.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ni Feng,Caiyan Gao,Cun-Yue Guo,Guangming Chen
We report flexible films of organic–inorganic thermoelectric (TE) composites based on organometallic coordination compound [copper-phenylacetylide (PhC2Cu)] nanobelts and single-walled carbon nanotubes (SWCNTs). Interestingly, an unusual mechanochromic luminescence phenomenon from bright green to dark red is clearly observed after grinding the PhC2Cu crystalline nanobelts. The PhC2Cu/SWCNT composites display high mechanical flexibility and excellent TE performance. The maximum power factor at room temperature can reach as high as 200.2 ± 10.9 μW m–1 K–2. The present study opens an avenue to fabricate novel organic–inorganic TE composite materials using organometallic coordination compounds such as PhC2Cu.
研究领域:
材料科学
·
有机无机复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 4
·547-555
·
IF 3.815
Shi Hui-Hui,Wu Shuang-Shuang,Wang Rui-Jia,Zhang Yi,An Shu-Hui,Lu Wei,Chen Tao
Mechanofluorochromic materials that render sensitive fluorescence color/pattern change upon mechanical stimuli have drawn extensive attention. However, traditional mechanofluorochromism relies on the chemical transformations of mechanophores, but their types are quite few. It remains challenging to develop mechanofluorochromic materials with customized fluorescence color changing response. Herein, a generally applicable strategy is proposed to present a class of double-layer mechanofluorochromic hydrogels based on the facile integration of two different-colored fluorescent hydrogels. Due to the UV transmittance change of top layer under Poisson’s effect, the emission intensity ratio of the upper and lower hydrogels exhibits a strain-dependent change, resulting in a force-triggered overlapping color variation. Both the UV transmittance of top layer and the fluorescence emission of bottom layer can be readily modulated to enrich the variety of mechanofluorochromism. Besides, the bottom layer is available to be printed by ion inks to fabricate patterned double-layer fluorescent hydrogel, holding great potential to design flexible mechanofluorochromic platforms for smart display and information encryption.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Lijun Wang,Yangyang Zhang,Yanfei Wang,Shiding Zhang,Fang Wang,Haixiang Song,Hanyi Duan
An in-depth investigation of the ultrasonic response of mechanophores containing weak covalent bonds within nanosized aggregates is vital for ultrasound imaging, drug delivery, and sensors. In this work, well-defined amphiphilic block SP-[poly(methyl methacrylate- b -N-isopropylacrylamide)] 2 SP-[p(MMA- b -NIPAM)] 2 ( P1 ) and amphiphilic random, SP-[poly(methyl methacrylate- r -N-isopropylacrylamide)] 2 SP-[p(MMA- r -NIPAM)] 2 ( P2 ) copolymers with SP mechanophore embedded at midpoint polymer chain are prepared by RAFT (reversible addition-fragmentation chain transfer) polymerization using a pre-synthesized novel functional bi (trithiocarbonate) and spiropyran (SP)-based RAFT reagent. Both P1 and P2 copolymers self-assemble in spherical micelles in AcCN/water mixed solvents, and several assemblies with different water contents are fabricated. The structural differentiation between block P1 and random P2 dominates the inverse influence of water content on the aggregate sizes of micelles. Under ultrasound irradiation , the SP mechanophore is activated within both micelles, and the amount of activated SP mechanophore increases progressively with prolonged sonication time. For P1 , the mechanochemical reaction (mechanochromism) kinetics in an aggregated state and a single chain state are different, while that of P2 micelles and liner are similar, inferred to be associated with the structure difference between both micelles. The mechanoactivation of SP mechanophore within micelles in AcCN/water mixed solvents is higher than in dissolved state due to the micellization of P1 and P2 , entangling the hydrophobic PMMA segments and partially swelling in the micellar core. Moreover, an increase in the medium's dielectric constant around the core's SP is also observed, promoting the SP mechanoactivation. This approach may provide a new strategy for preparing novel mechanophore-centered amphiphilic copolymers with colorful structures and high hydrophilicity . These can self-aggregate into nanoparticles in aqueous or mixed solutions, exhibiting effective effects of ultrasonic responsiveness. We expect this work to push forward the in-depth studies on the ultrasonic responsive mechanism of assembly and help open new research avenues into the mechanochemical reactions within nanosized aggregates.
研究领域:
材料科学
·
高分子化学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Xiaoqin Feng,Huijun Li,Weina Wu,Yuan Wang,Zhouqing Xu,Jia Fu
Herein, a multifunctional mechanochromic Metal-Organic Framework ( HPU-27 ) was designed for detecting water in THF and adsorbing Cr(VI) from contaminated water. The probe displays a reasonable quenching response for H 2 O over a concentration range of 0–80% with a detection limit of 0.039%, accompanied by an obvious fluorescent color transformation from yellow to colorless. The detection mechanism of HPU-27 toward H 2 O was proved as the alternation of the physical states between aggregation and dispersion in THF and H 2 O. Meanwhile, the HPU-27 material showed a good ability to adsorb Cr(VI) from contaminated water. The maximum adsorption capacity is 294.94 mg/g. In addition, the adsorption mechanism was discussed in detail. Thus, we believe that our strategy is promising extensively for the development of multifunctional MOF materials.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·
IF 5.8
Dongjie Zuo,Ayisha He,Hui Shen,Huifang Guo,Qinghua Xu,Zilin Li,Simin Li
N-heterocyclic carbene (NHC) ligands have emerged as highly effective surface ligands for the protection and functionalization of metal nanoclusters (NCs). However, research on NHC-stabilized metal NCs, including their synthesis, structure, properties, and applications, is still in its early stages. In this study, we present the first gold-copper alloy cluster protected by both NHC and alkyne ligands, denoted as Au3Cu(iPrNHCiPr)(PA)4 (abbreviated as Au3Cu, where iPrNHCiPr is a bidentate N-heterocyclic carbene ligand with isopropyl as the N-substituent, and PA is a phenylethynyl group). The precise composition of Au3Cu was confirmed through the utilization of electrospray ionization mass spectrometry (ESI-MS), and its structure was determined via X-ray single-crystal diffraction. It is worth noting that although the Au3Cu clusters do not display substantial light emission when exposed to UV lamps, they are capable of emitting green fluorescence subsequent to undergoing mechanical milling (?em = 500 nm). Powder X-ray diffraction (PXRD) analysis reveals that this transition is attributed to a crystalline-amorphous transformation of the cluster crystals. These atomically precise alloy clusters are expected to serve as a model for further investigation into the principles of mechanical milling of metal clusters for discolouration.
研究领域:
材料化学
·
纳米科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Materials Science
·
2023
·Vol. 17
·期 2
·1-12
·
IF 2.7
Zhang Na,Ma Xiang-Yu,Li Shun,Zhang Yu-Xin,Lv Chen,Mao Zheng-Peng,Dou Zi-Yi,Wang Tai-Sheng
The incorporation of mechanophores, motifs that transform mechanical stimulus into chemical reaction or optical variation, allows creating materials with stress-responsive properties. The most widely used mechanophore generally features a weak bond, but its cleavage is typical an irreversible process. Here, we showed that this problem can be solved by folding—unfolding of a molecular tweezer. We systematically studied the mechanochromic properties of polyurethanes with cyano-substituted oligo( p -phenylene) vinylene (COP) tweezer (DPU). As a control experiment, a class of polyurethanes containing only a single COP moiety (MPU) was also prepared. The DPU showed prominent mechanochromic properties, due to the intramolecular folding-unfolding of COP tweezer under mechanical stimulus. The process was efficient, reversible and optical detectable. However, due to the disability to form either intramolecular folding or intermolecular aggregation, the MPU sample was mechanical inert.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Yujian Zhang,Guilin Zhuang,Mi Ouyang,Bin Hu,Qingbao Song,Jingwei Sun,Cheng Zhang,Cheng Gu,Yuanxiang Xu,Yuguang Ma
Two isomers ( TPA-CNa and TPA-CNb ) consisting of twisted triphenylamine and cyanostilbene were synthetized by Knoevenagel condensation and C–N coupling reaction. The fluorescent colours of two isomers in crystalline state were sky-blue for TPA-CNa and green for TPA-CNb with quantum yields ( Φ f ) of 44.9% and 7.7%, respectively. The single crystal X-ray diffractometry revealed the fully different molecular conformations and packing modes of TPA-CNa (planar) and TPA-CNb (twisting), which might be the reason for different Φ f . The reversible mechanochromic and thermochromic fluorescence switching was observed in crystalline TPA-CNa powders. The sky-blue crystals were changed into the green-emissive solids after grinding , and they recovered their original state upon heating at 60 °C over 2 min. The reversible conversion of fluorescence colour was also realized by a pure thermal process. Powder X-ray diffractometry clearly demonstrated that the mechanochromic and thermochromic behaviour could be attributed to the crystal-to-amorphisation phase transition.
研究领域:
化学
·
材料科学
✓ 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）