JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Dongmei Li,Zhiwei Zhu,Da-Wen Sun
Raman spectroscopy has been employed for studying water structures in biomolecular aqueous solutions for decades but challenges remain to quantify the hydrogen bonding strengths in complex aqueous solution systems. In this study, four kinds of saccharide aqueous solutions were employed to investigate the quantitative relationship between the hydrogen bonding strength of water using confocal Raman microscopy and the Raman spectra of these solutions in the range of 3000–3800 cm −1 . Results showed that the enhancement effect of saccharide molecules on the hydrogen bonding strength of water increased with the concentration, and the degree of changes in the strength was related to the hydration capability and partial molal volume of saccharide molecules. An equation based on the average number of hydrogen bonds of water molecule was proposed to quantify the bonding strength in saccharide aqueous solutions with satisfactory accuracy as verified by T 2 relaxation time using nuclear magnetic resonance spectrometer.
研究领域:
生物化学
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分析化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Yuwen Tian,Yuanzhi Hong,Bingqi Chen,Kun Zhang,Dunhua Hong,Xue Lin,Junyou Shi
Indium oxide (In 2 O 3 ) is a promising semiconductor used for various photocatalytic reactions, yet the green and template-free synthesizing the different micro/nanostructured In 2 O 3 with tunable morphology is still full of challenge. In this study, the three morphological In 2 O 3 with 3D micro-cubelike (In 2 O 3 -MC), 3D micro-ricelike (In 2 O 3 -MR), and 2D nano-platelike (In 2 O 3 -NP) were successfully fabricated through a facile hydrothermal strategy without any organic template additives. Owing to the enlarged specific surface area , promoted charge migration rate and suitable surface oxygen vacancies density, the unique 3D ricelike In 2 O 3 -MR exhibited the best photocatalytic H 2 generation activity from biomass glucose solution, which was 1.9-fold and 1.7-fold higher than that of In 2 O 3 -MC and In 2 O 3 -NP under the same experimental conditions. In addition, the optimum photoactivity of In 2 O 3 -MR was achieved under the alkaline environment with pH = 11 and 1.0 wt% Pt cocatalyst loading, which was better than the most of previously reported In 2 O 3 -based photocatalysts . Simultaneously, the possible photocatalytic mechanism for solar H 2 evolution from glucose solution was also discussed. Our work will bring about potential application in preparation of other photocatalysts with controlling morphology for renewable photocatalysis .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Zhiwei Zhu,Jiayu Mai,Tian Li,Da-Wen Sun,Qingqing Zeng,Xiaohui Liu,Zhe Wang
Supercooling is a main controllable factor for the fundamental understanding the high-pressure shift freezing (HPSF). In the study, a self-developed device based on the diamond anvil cell (DAC) and confocal Raman microscopy was utilized to realize an in-situ investigation of supercooling behaviour during HPSF of the pure water and sucrose solution. The spectra were used to determine the freezing point which is shown as a spectral phase marker (S D ). The hydrogen bond strengths of water and sucrose solution under supercooling states were estimated by peak position and peak area ratio of sub-peaks. The results showed that the O H stretching bands had redshift under supercooling states. Moreover, the addition of sucrose molecules could strengthen the hydrogen bonding strength of water molecules under supercooling states. Thus, the DAC combined with Raman spectroscopy could be considered a novel strategy for a deep understanding of the supercooling behaviour during HPSF. URLs: http://www.ucd.ie/refrig , http://www.ucd.ie/sun .
研究领域:
生物物理学
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食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2017
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IF 3.648
Canghao Ni,Yinyan Gong,Xinjuan Liu,Chang Q. Sun,Zhaofeng Zhou
Low-temperature Raman spectroscopy revealed that sugar solvation depresses the critical temperature for homogeneous ice nucleation ( T N ) whose depression extent follows the order of: trehalose > glucose > fructose at the same concentration and the extent of T N depression for a specific sugar is proportional to its concentration. We attribute the T N depression to the O:H vibration mode redshift induced by the solute dipolar polarization and distortion of the solvent hydrogen bond (O:H O or HB with “:” being the electron lone air of oxygen). The O:H phonon redshift lowers the Debye temperature of the O:H specific heat and disperses the quasisolid-phase boundary and the associated T N .
研究领域:
生物物理学
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低温科学
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DOI
高影响因子
APPLIED OPTICS
·
2017
·Vol. 56
·期 31
·8845-8850
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IF 1.65
Mingfu Zhao,Lang Dai,Nianbing Zhong,Zhengkun Wang,Ming Chen,Bingxin Li,Binbin Luo,Bin Tang,Shenghui Shi,Tao Song,Xue Zou
In this study, a simple wet etching technique is developed by employing aqueous solutions of acetic acid and ultrasonic irradiation for the fabrication of a high-quality plastic optical fiber (POF) sensor. The effects of acetic acid concentration and temperature and ultrasonic power on the etching rate and surface morphology of the etched POFs are investigated. The transmission spectrum and sensitivity of the etched POF sensors are evaluated using glucose solutions. We discovered that the POF sensors, which are fabricated using an aqueous solution of acetic acid with a concentration of 80 vol. % under an ultrasonic power of 130 W and temperature of 25°C, exhibit good light transmission and a high sensitivity of 9.10 [(RIU)(g/L)]−1 in the glucose solutions.
研究领域:
光学传感
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材料科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Xi Wang,Dandan Wu,Du Yuan,Xu Wu
Chemical oxygen demand (COD) is a critical analytical parameter for organic pollutants in the aqueous system. Most COD detection methods have disadvantages such as virulence, time-consuming and complicated steps, which makes the exploration of suitable COD detection methods an important challenge. In this work, a novel nano-PbO 2 -composite electrochemical sensor was fabricated, and its electrochemical sensing properties for COD detection were investigated. The surface morphology and construction of nano-PbO 2 -composite electrodes were investigated using scanning electron microscope (SEM) and X-ray diffraction (XRD), which showed that the substrates were completely covered by nano-PbO 2 . The linear sweep voltammetry (LSV), the hydroxyl radical (·OH) generation ability, and electrochemical impedance spectroscopy (EIS) were employed to study the electrochemical properties. Good analytical characteristics in standard glucose solutions were achieved with Ti b /SnO 2 -Sb 2 O 3 / β -PbO 2 sensor. In particular, Ti b /SnO 2 -Sb 2 O 3 / β -PbO 2 showed a good correlation between the sensor response and the COD values, which exhibited a linear range from about 500–9000 mg·L −1 . Generally, the nano-PbO 2 sensor displayed fast-response speed and simple instrumentation, which is promising for the COD determination with low cost, high detection sensitivity, and wide linear range.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF FOOD ENGINEERING
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2025
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IF 5.8
Yuan Tao,Bowen Yan,Nana Zhang,Jianxin Zhao,Wei Chen,Daming Fan
Microwave vacuum evaporation (MVE) is a promising alternative over traditional vacuum evaporation, offering rapid evaporation rates and high efficiency. This study investigated the MVE processes and the resulting quality of sugar solutions under varying microwave power densities (10–50 W/g) and vacuum levels (40–80 kPa). The results indicated that a moderate microwave power density (∼30 W/g in this study) was optimal for MVE, balancing both evaporation efficiency and sugar quality. Furthermore, the dielectric properties of the sugar solutions during MVE (over the temperature range of approximately 25-110°C) exhibited a time-dependent decrease in the dielectric constant (ε′), whereas both the dielectric loss factor (ε′′) and loss tangent (tanδε) initially decreased before increasing. Similar values of ε′′ and tanδε were observed for sugar solutions evaporated at high power densities, accounting for the phenomenon of saturated evaporation. The penetration depth, reflection loss, and relative input impedance results indicated that the 4 mm-thick sugar solutions exhibited good microwave absorption during the MVE, except at the initial and final stages, confirming the feasibility of utilizing a liquid film configuration in MVE applications. In conclusion, the analysis of dielectric and microwave absorption properties offers a robust approach for optimizing the MVE process, facilitating the production of high-quality sugars.
研究领域:
食品科学
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化学工程
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电磁学
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工艺优化
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Duoduo Yang,Junhao He,Kaishen Chen,Yiping Cheng,Zhiyu Liu,Chengyun Zhang
Surface-enhanced Raman scattering (SERS) is a powerful, label-free technique for trace-level molecular detection; however, its broad application is limited by the lack of low-cost, scalable, and reproducible substrates. Here, we introduce a facile route to large-area SERS nanoplatform using liquid-assisted femtosecond (fs) laser direct writing (FLDW) in sucrose solution, followed by thermal evaporation of a thin Au nanofilm composed of nanoparticle clusters on aluminum-alloy substrates. By optimizing sucrose concentration and fs laser power, densely packed arrays of nanocones, nanoplates, and nipple-like protrusions are produced, serving as robust scaffolds for plasmonic hotspots. After thermal evaporation, the substrate exhibits super hydrophobicity with water contact angle (WCA) ∼157°, which concentrates analyte droplets and further amplifies Raman signals. Using Rhodamine 6 G (R6G) and malachite green (MG) as probe molecules, the limits of detection (LODs) were determined to be 3.5 × 10 −14 M for R6G and 6.6 × 10 −11 M for MG, with corresponding enhancement factors (EFs) of 1.19 × 10 11 and 6.13 × 10 7 , respectively. Uniformity tests yielded relative standard deviations (RSDs) below 4 %, and cycle reusability assays showed < 15 % signal loss. After 150 days, more than 80 % of the initial SERS signals were retained, confirming long-term stability under ambient conditions. Simulation results reveal intense electromagnetic hotspots localized at nanostructure tips and junctions, accounting for the substrate’s exceptional SERS performance. This straightforward, contamination-free approach enables scalable production of durable, high-performance SERS substrates for environmental monitoring, food safety, and biomedical diagnostics.
研究领域:
分析化学
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纳米科技
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生物医学工程
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环境监测
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食品安全
·
分子诊断
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
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IF 5.162
Zhihui Chai,Chenglin Li,Yuan Zhu,Xiaorong Song,Manyi Chen,YuLing Yang,Dong Chen,Xinquan Liang,Junhua Wu
The presence of phenolic substances in sugarcane juice seriously affects the color value of sugar products. Magnetic chitosan (MCS) was prepared using an ionic cross-linking technique, and then was modified with arginine to prepare arginine-modified magnetic chitosan (AMCS) for use as a new sucrose clarifying adsorbent. Gallic acid (GA) is a representative phenolic substance and was used to test the adsorption properties of the prepared AMCS. The adsorption kinetics indicated that the adsorption of GA on AMCS conformed to the pseudo-second-order model, the main adsorption mechanism was chemisorption. The Langmuir equation fit well and with good linearity, and indicated a maximum adsorption capacity of 48.38 mg g −1 . The adsorption process was consistent with monolayer adsorption and spontaneous endothermic process. The prepared AMCS exhibited excellent regenerability, and can effectively remove GA in sugarcane juice to improve product safety.
研究领域:
材料科学
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化学工程
·
食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2019
·
IF 2.547
Ruichong Chen,Mao Yang,Yanli Shi,Hailiang Wang,Hao Guo,Yuanyuan Zeng,Jianqi Qi,Qiwu Shi,Zhijun Liao,Tiecheng Lu
An advanced core-shell ceramic pebble with Li 4 TiO 4 pure phase core and Li 2 TiO 3 nanostructured shell was prepared by a physical coating method. The phase compositions, morphology and microstructure of Li 4 TiO 4 –Li 2 TiO 3 core-shell ceramic pebbles were investigated. We discovered that using chitosan solution to assist rolling coating helps to improve the coating uniformity of core-shell green pebbles. In addition, the results show that the obtained Li 4 TiO 4 –Li 2 TiO 3 core-shell ceramic pebbles have a diameter of ∼1.1 mm, the shell thickness of ∼13 μm and density of 2.31 ± 0.03 g/cm 3 . It is also noted that the Li 2 TiO 3 shell still maintains the nanostructure (∼80 nm) after sintering. This study provides a feasible method for preparing Li 4 TiO 4 –Li 2 TiO 3 core-shell ceramic pebbles which have a great potential application for the test blanket module (TBM) of International Thermonuclear Experimental Reactor (ITER).
研究领域:
材料科学
·
核工程
·
陶瓷
✓ 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）