THERMOCHIMICA ACTA
·
2021
·
IF 3.115
Qicheng Chen,Nan He,Jing Fan,Fenhong Song
As the analog of ionic liquids, deep eutectic solvents (DESs) have drawn intense attention and are considered as a novel class of green solvents. Due to their splendid advantages such as low melting points, low vapor pressure, high thermal stability, wide liquid ranges and low price. DESs have been researched for a wide range utilization in many areas. Especially they have been investigated as heat transfer fluids recently. Thermal conductivity is an important transport property that influences the convective heat transfer. Nonetheless, very limited data is available on the thermal conductivity of DESs. In this work, nine DESs were prepared by using betaine as hydrogen bond acceptor and glycerol or 1,2-propanediol as hydrogen bond donor. Then, the thermal conductivities of these DESs were measured in a large temperature range (293 to 373 K) at atmospheric pressure. The thermal conductivity measurement had a combined expanded uncertainty better than ± 2.0% (in the 0.95 confidence level).
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
PLoS One
·
2014
·Vol. 9
·期 6
·e100731
·
IF 3.534
Ke Xu,Ping Xu
Lactic acid is an important chemical with various industrial applications, and it can be efficiently produced by fermentation, in which Bacillus coagulans strains present excellent performance. Betaine can promote lactic acid fermentation as an effective osmoprotectant. Here, positive effect of betaine on fermentation by B. coagulans is revealed. Betaine could enhance lactic acid production by protecting l -LDH activity and cell growth from osmotic inhibition, especially under high glucose concentrations and with poor organic nitrogen nutrients. The fermentation with 0.05 g/L betaine could produce 17.9% more lactic acid compared to the fermentation without betaine. Beet molasses, which is rich in sucrose and betaine, was utilized in a co-feeding fermentation and raised the productivity by 22%. The efficient lactic acid fermentation by B. coagulans is thus developed by using betaine and beet molasses.
研究领域:
微生物学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xinyi Mei,Kege He,Rongshan Zhuang,Mubing Yu,Yong Hua,Xiaoliang Zhang
Lead halide perovskite quantum dot (QD) shows great potential for application in light-emitting diodes (LEDs) due to its high photoluminescence quantum yield (PLQY), high exciton binding energy, tunable emission spectra and solution processibility. However, the dynamic binding of conventional organic acid/amine ligands to the QD surface significantly deteriorates its optoelectronic properties and stability, to a large extent affecting the electroluminescence performance of QD-based LEDs. Herein, the zwitterionic molecule, betaine (BET) that could firmly anchor on the QD surface, is introduced to stabilize the dynamic surface and simultaneously passivate the surface defects of QDs. Systematically experimental studies and theoretical calculations reveal that BET-treatment could remove the dynamically bonded OA/OAm ligands and substantially diminish the surface defects of QDs, leading to a boosted PLQY of up to 92 % with improved stability of BET-QDs. Consequently, the electroluminescence performance of green-emitting QD-LEDs was largely improved that the external quantum efficiency was increased to 10.8 %, along with a decreased turn-on voltage of 3.2 V. This work provides new insights into the design criterion of surface ligands for modulating the surface chemistry of perovskite QDs to realize high-performance LEDs or other optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Luyao Yang,Rong Liu,Meiying Xie,Fan Yang
Metal–organic framework materials (MOFs) have potential for practical applications in solid-phase separation technology. However, no studies of the separation of hafnium and zirconium using MOFs have been performed. This work synthesized MIL-101-DGA solid-phase adsorbent material, which was synthesized using amino-containing MIL-101-NH2 as a matrix material by introducing diglycolic acid (DGA) functional groups through a one-step ring-opening reaction. Betaine hydrochloride was selected as the complexing agent to establish the MIL-101-DGA coupling betaine hydrochloride push–pull system; this system could act as an alternative to the traditional MIBK-HSCN separation system. We are the first to report that this MIL-101-DGA coupling betaine hydrochloride system could obtain separation coefficients (βZr/Hf) of 19.7 at pH 0.50 and 8.2 at pH 1.46. Furthermore, the highest adsorption capacity of MIL-101-DGA for Zr was 63.7 mg/g. These results demonstrated that MIL-101-DGA had excellent separation performance for zirconium and hafnium in the betaine hydrochloride medium. This system also exhibited an outstanding cycling performance and immersion stability. After multiple adsorption/desorption cycles and 1 week of immersion in various solutions, the structure and adsorption capability essentially remained unchanged. The adsorption mechanism was thoroughly examined using a suite of analysis and detection methods, including the slope method, FT-IR, XPS, and DFT. In conclusion, we propose that the MIL-101-DGA coupling betaine hydrochloride system, which is an efficient and green separation system, could replace the traditional MIBK-HSCN separation system; our study provides a concept for the industrialization of zirconium and hafnium separation from key mineral resources.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wen-yu Zheng,Xin-xin Pang,Yue-tong Huang,Murtaza Ali,Sui-lin Qiu,Min Gu,Jia-ling Shen,Qiu-ya Lin,Si-xia Zheng,Xin-An Zeng,Lan Liao
The utilization of natural deep eutectic solvents (NADESs) for super-deamidation of wheat gluten represents a cost-effective approach to expand its potential applications as a plant protein source and reduce the occurrence of allergens. However, NADESs are susceptible to deconstruction during hydration, leading to unstable super-deamidation. Herein, we prepared a ternary hydrated NADES (HB3C1G1-N) composed of betaine, citric acid, and glucose, doubling the protein preparation concentration (50 mg/mL) compared to previous work and achieving a record-breaking degree of super-deamidation at 99.58%. Experimental and computational analyses revealed that the betaine in the NADES autonomously interacts with the citric acid and glucose at the hydrogen bond acceptor sites during hydration, reversing the disassembly of the hydrogen bond network in water and playing a crucial role in the accessibility of the buried amide group. The super-deamidated wheat gluten exhibited structural characteristics, such as fewer disulfide bonds and more low-molecular-weight subunits, resulting in a lightning-like microstructure in the model emulsion and improving the stability of oil droplets. This work demonstrates a green and scalable super-deamidation pathway and provides a foundation for broadening the application of super-deamidated wheat gluten.
研究领域:
食品科学
·
分子生物学
✓ 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）