Advanced Optical Materials
·
2021
·Vol. 10
·期 3
·2101350
·
IF 9.926
Mengfei Kong,Yanhui Zhan,Tao Yang,Shuangqing Wang,Xudong Guo,Rui Hu,Yan Qian,Quli Fan,Guoqiang Yang
Threshold temperature sensors are crucial for recording the thermal histories of environments under different scenarios. However, most organic threshold thermometers are not suitable for high-temperature indication due to significant thermo-facilitated emission quenching. Here, a series of ratiometric luminescent high-temperature threshold organic film indicators have been realized by synergetic effects of intramolecular local excited to charge transfer states and disaggregation from excimer to monomer. Varying the polymer matrixes with different glass transition temperatures effectively tunes the threshold sensing temperatures. More importantly, the wide sensing span of the high-temperature region enables the single-sample films (in one kind of polymer matrix) to achieve multiple temperature threshold indications, directed only by multiple naked-eye emission color changes. These drop-casting organic film thermometers indicate great potential in robust and low-cost outdoor applications, as well as large-area and flexible threshold temperature sensing.
研究领域:
材料科学
·
化学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ziyang Zhang,Guanyu Liu,Saifei Gou,Weida Hong,Haitao Jiang,Zhongying Xue,Miao Zhang,Wenzhong Bao,Ziao Tian,Zengfeng Di
Transition-metal dichalcogenides (TMDs), as atomically thin semiconductors, have shown immense promise for next-generation electronics due to their high mobility and potential for creating van der Waals heterostructures. However, precise control of the threshold voltage ( V th ) in field-effect transistors (FETs) remains a significant challenge, impeding the development of 2D material circuits with tailored electronic functions. Herein, a graphene-assisted one-step van der Waals integration technique is presented for fabricating multi-threshold 2D functional circuits. Graphene's unique property of having a surface without dangling bonds is utilized as an intermediary layer, allowing for the transfer of electrodes with various work functions and high- κ dielectric layers onto 2D channel materials in a single step. This technique has successfully produced Al-gated MoS 2 FETs with a V th of −0.2 V and Au-gated MoS 2 FETs with a V th of 1.9 V. This precision enables the development of functional devices such as rail-to-rail inverters with large noise margins. Furthermore, more complex multi-threshold 2D circuits are achieved, including basic logic gates (NOT, NAND, NOR), six-transistor static random-access memory (6T-SRAM), and ring oscillators (RO). This work showcases a scalable and effective strategy for threshold voltage engineering in 2D material-based circuits, paving the way for sophisticated electronic and optoelectronic applications.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 4
·933
·
IF 4.6
Jialing Lu,Jia Zheng,Dong Zhao,Yan Xu,Shuang Chen
Strong-aroma type Baijiu and its diluted samples were characterized through descriptive analysis. Significant changes were observed in four (ethanol, Jiao-aroma, fruity, and grain) of the nine aroma attributes, primarily attributed to variations in ethanol concentration rather than other compounds. The thresholds of 40 compounds in aqueous solutions with alcohol concentrations of 20%, 30%, 40%, 50%, and 60% were measured using three-alternative forced-choice tests. The thresholds of 30 compounds were significantly positively correlated with ethanol concentration. The thresholds of 40 compounds were affected by ethanol concentration to varying degrees, with changes ranging from 2 to 692 times. Due to the varying degrees of alcohol influence on the compound threshold, the aroma profile of diluted Baijiu sample is different from the original Baijiu sample.
研究领域:
食品科学
·
感官分析
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Siqi Zhang,Shu Wu,Qi Wang,Mengxiang Guan,Bowen Yang,Guirong Peng,Xiaojia Zhao
P(VDF-HFP) is widely used in transistors, electret and artificial skin due to its excellent dielectric properties . In order to dramatically improve its dielectric constant, conductive fillers are used for doping, but the compatibility is not optimistic between the fillers and the PVDF . In this paper, PEDOT:PSS/P(VDF-HFP) all-organic films with interpenetrating network structure were prepared by the addition of H 2 O. The dielectric constant of the film with 0.5 wt % PEDOT:PSS reached up to 323 and the tanδ was only 0.48 (1 k Hz, 18 °C). The addition of the H 2 O made the small amount of PEDOT:PSS evenly distribute in the P(VDF-HFP), as a result, the percolation threshold decreased. Besides, molecular chains of PEDOT:PSS were overlapped to form a uniform network. This paper provided a novel preparation method for a uniform film with two kinds of matters with different compatibility.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Current Research in Food Science
·
2025
·
IF 7
Xuexue Zheng,He Xie,Wenjie Fu,Chao Wang,Tengfei Hu,Xingchang Ou,Jian'an Huang,Zhonghua Liu,Qin Li
While extensive research has focused on the flavor of Fu brick tea (FBT), the perceptual interactions among its aromatic components remain unclear. To address this, twenty representative aroma compounds were selected from FBT to determine their thresholds and evaluate their interactions by analyzing threshold changes before and after mixing. The results revealed discrepancies between the determined thresholds and literature values, particularly for α -terpineol, methyl heptenone, and geranylacetone, which demonstrated ratios of 73.54, 6.62, and 6.41, respectively. Mixtures with similar aromas or structures exhibited synergy, whereas those with differing aromas or structures displayed masking effects. Additionally, the odor compound ( E )-nerolidol was added to the tea infusion at a concentration below its threshold level to investigate its impact on the overall aroma perception of FBT through sensory analysis and electronic nose assessments. The findings indicated that sub-threshold compounds could significantly influence the overall aroma profile of FBT.
研究领域:
食品科学
·
感官分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Wanying Xie,Ji Li,Feiyun Sun,Wenyi Dong,Zijun Dong
Aiming at the fouling problem of PVDF membrane, one novel integrated strategy was used for the first time, including hydrophilic membrane modification and low-pressure operation. Permeability and anti-fouling ability of PVDF were simultaneously improved by nano-TiO 2 embedment. From perspective of operating condition optimization, the concepts of critical flux (J C ) and threshold flux (J TH ) were recommended as fouling-control tools. The J C and J TH of PVDF-TiO 2 membrane were tested by two constant pressure-steps methods, i.e. Constant pressure-step method and Alternating constant pressure-step method. Three indicators, consisting of instant FTTT curves, dFlux/dt condition and TMP-Flux ave curve, were employed to evaluate the J C and J TH of PVDF-TiO 2 membrane. In brief, the J C and J TH of PVDF-TiO 2 were 10.62 and 23.91 L/(m 2 ·h), respectively, which were nearly 3 times of PVDF membrane. Fouling resistance results displayed that protein irreversible fouling of two PVDF membranes were effectively reduced by J C mode and J TH mode. Besides, reversible fouling of PVDF-TiO 2 membrane was controlled well by J C mode meanwhile. The pure water filtration line (PWF line) and the normalized resistance were both used to judge the form of J C of two membranes. As compared with PVDF, it was speculated the enhancement of J C and J TH mainly related to the better hydrophilicity and local hydraulic condition of PVDF-TiO 2 modified membrane.
研究领域:
环境科学
·
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
Extreme Mechanics Letters
·
2021
·
IF 4.567
Wenlei Zhang,Jian Hu,Hang Yang,Zhigang Suo,Tongqing Lu
In a previous paper (Zhang et al., 2020), we have demonstrated an adhesive of high fatigue threshold ∼ 300 J/m 2 using an as-prepared hydrogel of long-chain polymer network . In most applications, however, hydrogel adhesives are in contact with water. The long-chain hydrogel swells and reduces the fatigue threshold. Here we demonstrate a type of swell-tolerant and fatigue-resistant hydrogel adhesive: a long-chain polymer network in topological entanglement with short-chain microgels . The short-chain microgels restrict swell, and the long-chain network retains the high fatigue threshold. After the hydrogel adhesives swell in water to equilibrium, the fatigue threshold is 61 J/m 2 for an adhesive of a long-chain network without microgels, and is 262 J/m 2 for an adhesive of a long-chain network with microgels.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Xueyi Cai,Hongfu Li,Mengzhen Liao,Qihong Zheng,Huan Chen,Yang Zhang,Xiao Chen,Dong Liang
Bitter gourd (fruit of Momordica charantia L.) is a popular vegetable and medical herb known for its intense bitter taste. However, its major bitter-tasting compounds have not been fully characterized. This study aimed to decode its bitterness by application of the sensomics approach. Combining solvent extraction, sensory analysis-guided fractionation and purification with medium-pressure liquid chromatography and high-pressure liquid chromatography, nine bitter-tasting cucurbitane-type triterpenoids were isolated from bitter gourd. The structures of isolated compounds were determined by high-resolution mass spectrometry and nuclear magnetic resonance spectroscopy. The bitter taste recognition thresholds of isolated compounds were in the range from 1.4 mg/L ((23 E )-3 β - O -malonyl-7 β ,25-dihydroxycucurbita-5,23-dien-19-al, 9 ) to 19.1 mg/L (yeojooside C, 5 ) in 3% ethanol as determined by trained human assessors. Quantification with UPLC-MS/MS demonstrated their natural concentrations in bitter gourd fruits were in the range between 14.2 ± 0.9 mg/kg (yeojooside C, 5 ) and 245.6 ± 22.1 mg/kg (3- O -malonylmomordicine I, 10 ) on a dry weight basis. Calculation of the dose-over-threshold (DoT) factors showed three compounds, namely 3- O -malonylmomordicine I ( 10 ), momordicine I ( 3 ), and (23 E )-3 β - O -malonyl-7 β ,25-dihydroxycucurbita-5,23-dien-19-al ( 9 ) were the bitter principles in bitter gourd fruits. On the other hand, momordicoside K ( 2 ), which had been known as a bitter principle of bitter gourd for more than forty years, had been proven to be an extraction and isolation artifact rather than a natural component of the plant. Besides, an acid-catalyzed isomerization reaction in the side chain of cucurbitane was discovered, which might explain the formation mechanism of many cucurbitane-type triterpenoids from bitter gourd.
研究领域:
植物化学
·
食品科学
·
药用植物学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Jin Guang-Zhi,Chen Le-Hang,Gong Yu-Zhen,Li Peng,Wang Run-Guo,Li Fan-Zhu,Lu Yong-Lai
The fatigue resistance of casting polyurethane (CPU) is crucial in various sectors, such as construction, healthcare, and the automotive industry. Despite its importance, no studies have reported on the fatigue threshold of CPU. This study employed an advanced Intrinsic Strength Analyzer (ISA) to evaluate the fatigue threshold of CPUs, systematically exploring the effects of three types of isocyanates (PPDI, NDI, TDI) that contribute to hard segment structures based on the cutting method. Employing multiple advanced characterization techniques (XRD, TEM, DSC, AFM), the results indicate that PPDI-based polyurethane exhibits the highest fatigue threshold (182.89 J/m 2 ) due to a highest phase separation and a densely packed spherulitic structure, although the hydrogen bonding degree is the lowest (48.3%). Conversely, NDI-based polyurethane, despite having the high hydrogen bonding degree (53.6%), exhibits moderate fatigue performance (122.52 J/m 2 ), likely due to a more scattered microstructure. TDI-based polyurethane, with the highest hydrogen bonding degree (59.1%) but absence of spherulitic structure, shows the lowest fatigue threshold (46.43 J/m 2 ). Compared to common rubbers (NR, NBR, EPDM, BR), the superior fatigue performance of CPU is attributed to its well-organized microstructure, polyurethane possesses a higher fatigue threshold due to its high phase separation degree and orderly and dense spherulitic structure which enhances energy dissipation and reduces crack propagation.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Rongxing Qiu,Xiaoyan Luo,Le Yang,Jiaran Li,Xiaoyan Chen,Cheng Peng,Jinqing Lin
In this work, flexible hydrogen-bonded frameworks composed of amino pyridinium-based protic ionic liquids (ILs) marked as [X-PyH][Tf2N] were designed as NH3 absorption agents. Interestingly, NH3 absorption isotherm of these ILs present sigmoidal absorption isotherm (S mode), and the threshold pressure (TP) decreases from 75 to 6 mbar with the tunable of hydrogen bonded frameworks by varying the substituted group X. Combined with XRD characterizations, Fourier transform infrared and 1H NMR spectroscopies, thermometric analyses, and theory calculations, it indicates NH3 fixed by these ILs via acid–base interaction as well as hydrogen bonding based on the activation of sites through the fracture of the hydrogen-bonded frameworks, which would reform along with heat release when NH3 desorption. Therefore, S mode NH3 absorption with [3NH2-PyH][Tf2N] presents low TP of 6 mbar (6000 ppm) at 30 °C, and its NH3 capacity increases sharply and followed by a continuous increase to 3.85 mol/mol IL (175 mg/g IL) at 1.0 bar, which is higher than that of the reported ILs. The fixed NH3 could be desorbed completely in vacuum at 80 °C and 1 mbar. [3NH2-PyH][Tf2N] maintained its high capacity within 20 time recycles. The sigmoidal NH3 absorption would be considered as one of the potential approaches for its simultaneous efficient absorption and energy-saving separation at low concentrations.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·763-774
·
IF 3.074
Huizhi Liu,Qilin Mei,Guomin Ding,Han Xiao,Shuhui Chen,Zhixiong Huang
The percolation thresholds of poly ether ether ketone/graphene (PEEK/Gr) composites in most studies are high due to the random distribution of Gr in the matrix. Here, aminated poly-ether-ether-ketone/graphene network (PEEK-NH 2 /GN) nanocomposites were prepared by electrostatic adsorption of PEEK-NH 2 with positive charges and graphene oxide with negative charges, followed by in -situ reduction and hot-pressing. The GN structure of composites was well presented in the images of scanning electron microscope. The PEEK-NH 2 /GN nanocomposites exhibited excellent electrical conductivity with a maximum conductivity of 0.0634 S·cm −1 and a percolation threshold as low as 0.25 vol%. In addition, the maximum tensile strength of nanocomposites was reached at 93 MPa when the Gr content was 0.5 wt%. We believe that this approach is a new avenue for the production of low filler high conductive polymer composites with potential commercial prospects in various fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Wei Qiu,Hailong Ru,Jilei Wang,Jingming Kuang,Yougui Yu,Qing Zheng
This study aims to investigate the influence of the interactions between the major aromatic compounds in Baijiu (esters and acids) on the aroma and taste profile of Baijiu. The electronic nose and electronic tongue were used to assess the effects of adding acids on the aroma and taste of Baijiu. Results indicate that the incorporation of acids remarkably alters the olfactory intensity of Baijiu, with minimal impact on its taste, thereby confirming the profound influence of ester–acid interactions on volatile aroma components. Furthermore, the best-estimated threshold method was utilized to determine the aroma thresholds of four key esters and their corresponding acids. Butyric, hexanoic, and lactic acids exhibit synergistic effects by substantially lowering the aroma thresholds of their respective esters. By contrast, acetic acid exerts a masking effect, thereby elevating the aroma threshold of ethyl acetate. Sensory evaluation corroborated the influence of ester–acid interactions on the overall aroma of Baijiu, which is consistent with the aroma threshold findings. Molecular docking methods were applied to decipher the mechanism underlying ester–acid interactions. Hydrogen bonding emerges as a pivotal interaction mode among aromatic compounds, with the binding energy intimately linked to the extent of synergy or masking effects.
研究领域:
食品科学
·
分析化学
·
感官科学
✓ 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）