CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 6
·1234-1240
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IF 1.063
Cui Ruizhi,Li Wu,Dong Yaping,Li Jun
The stable phase equilibria of quaternary systems LiBr-NaBr-MgBr 2 -H 2 O and LiBr-KBr-MgBr 2 -H 2 O at 298.15 K were studied by both experimental measurement(isothermal solution saturation method) and theoretical prediction(Pitzer model). The solubilities of the saturated solution have been determined experimentally and two stable phase diagrams and relevant water diagrams of the two quaternary systems were obtained. Results show that quaternary system LiBr-NaBr-MgBr 2 -H 2 O is hydrate II type as NaBr and NaBr·2H 2 O coexistence. Its phase diagram consists of only one invariant point, four univariant curves, and five crystallization fields. The quaternary system LiBr-KBr-MgBr 2 -H 2 O is a complex type as the double salt KBr·MgBr 2 ·6H 2 O formed. In addition to this double salt, the three single salts LiBr·2H 2 O, KBr and MgBr 2 ·6H 2 O also crystallize. In this paper, the solubilities of phase equilibria in above quaternary systems were also calculated by the Pitzer’s electrolyte solution model. All the needed parameters can be obtained from the literature or be fitted by experimental data. On the Basis of the experimental and calculated results, the phase diagram of the quaternary system was plotted for comparison. It shows that the calculation results are consistent with the experimental ones.
研究领域:
化学热力学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
·
IF 3.119
Guo-Liang Nie,Rui-Zhi Cui,Wu Li
According to the composition characteristics of lithium, potassium, bromine, and other resources rich in the salt lake brine of the Qinghai–Tibet Plateau, the phase equilibria of the quaternary system LiBr-NaBr-KBr-H2O and its ternary subsystem LiBr-KBr-H2O at 323.15 K are studied by an isothermal dissolution equilibrium method. The solubility of each system in equilibrium solution at the corresponding temperature is measured, and the corresponding phase diagrams are drawn according to the phase equilibrium experimental data. The results show that there is no complex salt or solid solution in the ternary system LiBr-KBr-H2O at 323.15 K. The phase diagram contains one invariant point (E1), two univariate curves (AE1 and BE1), and two equilibrium solid crystallization regions (corresponding to LiBr·H2O and KBr), belonging to the simple cosaturated type. The quaternary system LiBr-NaBr-KBr-H2O also has no formation of complex salt and solid solution. The phase diagram contains two invariant points (F1 and F2), five univariate curves (E1F1, E3F1, F1F2, E2F2, and E4F2), and four equilibrium solid-phase crystallization regions (corresponding to LiBr·H2O, KBr, NaBr·2H2O, and NaBr). At the same time, to further explain the phase equilibrium relationship of each system at different temperatures and the change rule of each component, comparison and discussion are carried out.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Feng-rui Li,Yu-xiang Jia,Rui-qing Guo,Meng Wang
It has been realized the proton leakage behavior of anion-exchange membrane (AEM) seriously influences the practical applications of bipolar membrane electrodialysis (BMED), for example, the reclamation of brine. In this work, a concept of composite AEM, coating a thin acid-blocking layer bearing weak base functional groups onto a strong base AEM substrate, is put forward to alleviate the membrane conductivity deterioration due to the endowment of acid-blocking property. Above all, Poly(vinylidene fluoride)-graft-Poly[2-(N,N-dimethylamino) ethyl methacrylate] (PVDF-g-PDMAEMA which embraces significant hydrophilic differences between the side and main chains is synthesized by atom transfer radical polymerization (ATRP) and used for preparing the acid-blocking layer by solvent evaporation. Subsequently, series of experiments for measuring the water uptake, the acid adsorption, the current-voltage curve and transport number are performed to optimize the ion-exchange capacity of as-synthesized membrane material. Furthermore, as-prepared acid-blocking layer is coated onto the a strong base AEM substrate fabricated from the blend of PVDF and cross-linking PDMAEMA to prepare the supposed composite AEM. SEM observation clearly demonstrates the bilayer structure and good adhesion therein. AFM phase image confirms the formation of microphase separation morphology in which the hydrophilic channel used for ion transport looks uniform, continuous and well-connected. The ED-based acid concentration and BMED-based brine reclamation experiments show as-prepared composite AEM has an excellent acid-blocking performance and acceptable membrane resistance in comparison with the conventional AEM and even the commercial acid-blocking AEM. This indicates that the proposed AEM-preparing strategy may contribute to beating the trade-off effect between acid-blocking performance and membrane conductivity.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuyang Li,Hui Liu,Li Ding,Liqi Li,Lixiang Wang,Deren Yang,Yanjun Fang
Perovskite nanocrystals (PNCs) offer unique advantages in large-area and thick-film deposition for X-ray detection applications due to the decoupling of the crystallization of perovskite from film formation, as well as their low-temperature and scalable deposition methods. However, the partial detachment of long-chain ligands in PNCs during the purification process would lead to the exposure of surface defects, making it challenging to ensure efficient charge carrier extraction and stable X-ray detection. In this study, we propose a beneficial strategy that involves the in situ reparation of these exposed defects with sodium bromide (NaBr) during the purification process to construct CsPbBr3 PNC-organic bulk heterostructure X-ray detectors. The NaBr-passivated PNCs exhibit stronger photoluminescence intensity and lower trap density in films compared to those of the control samples, confirming the effective passivation of halide vacancy defects. Furthermore, the NiOx hole transport layer with remarkable electron blocking capability is introduced to further suppress the dark current of the devices. Consequently, the optimal devices exhibit a large sensitivity of 4237 μC Gyair–1 cm–2 and a low dark current density of 10 nA cm–2, as well as improved operational stability, which allows for high-contrast and low-dose X-ray imaging applications.
研究领域:
材料科学
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纳米技术
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放射学
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Shunfeng Yu,Jie Zhang,Xiaoxiao Chen,Xinjun Wu,Xin Zhao,Zhengdao Zhu,Jiawei Zhang,Yongkang Zuo,Chuanzhuang Zhao
Organic photoluminescent materials with room-temperature phosphorescence (RTP) are of great interest, yet achieving RTP in hydrogels faces challenges due to water-quenching effects. In this study, a straightforward method is presented to achieve RTP hydrogel using a self-healing and salt-hardening hydrogel. The hydrogel is synthesized by polymerizing acrylic acid (AA) with diethylenetriamine (DETA) as the dynamic crosslinker. The poly(acrylic acid)/DETA hydrogel could achieve an afterglow lasting 1.6 s after soaking with NaBr solution. The salt-enhanced hydrophobic aggregation of the hydrogel network promotes the clustering of carboxyl groups and oxygen atoms, resulting in a rigid environment that suppresses nonradioactive transitions and leads to the manifestation of RTP. Additionally, the dynamic association of AA-DETA allows the freeze-dried hydrogel powder to be blended with various hydrophobic dyes, leading to a remodelable hydrogel with delayed emission of multiple colors. In general, by combining salt-hardening property with self-healing property together, a RTP hydrogel platform that can be facilely loaded with various organic dyes is proposed.
研究领域:
材料科学
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化学
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光学材料
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2019
·
IF 1.479
Foster Dodzi Gomado,Yanling Wang,Forson Kobina,Caili Dai,Augustus Owusu-Boadi
An experimental investigation was conducted to evaluate the impact of silica nanoparticles concentration on a pH-responsive emulsion system in terms of its emulsification, phase inversion mechanisms and long-term stability. Also, the adsorption studies of the pH-responsive emulsifier and the nanoparticles were evaluated in order to comprehend the synergism between the nanoparticles and the emulsifier. The sorption of the emulsifier onto the surfaces of the nanoparticles caused wettability alteration enabling the nanoparticle to act as nanocomposite emulsifier. It was found out that the emulsions undergoes phase inversion upon treating it with a minimum of 1 ml of 0.5 M HCl and also increasing the nanoparticles concentration had no noticeable effect on the phase mechanism, However, the nanoparticles cannot stabilized the O/W formed after the phase inversion. The presence of the nanoparticles improves the thermal stability of the reversible emulsion and also protects the emulsions against the presence of NaBr and otherwise for salts like NaCl and Na2SO4. These outcomes reveal the various properties of a pH-responsive emulsion which are affected by the presences of nanoparticles in order to fully control stimuli-responsive emulsions to our advantage.
研究领域:
化学工程
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胶体科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiaoqin Cao,Shiyuan Wang,Runxi Wang,Zhenghua Sun,Yujun Feng,Hongyao Yin
Partially hydrolyzed polyacrylamide (HPAM) hydrogels are widely used as fracturing fluids for extracting underground hydrocarbon resources. Weighting salts are incorporated to enhance hydrogel density to address the extreme pressure encountered in ultra-deep reservoirs. These salts exert significant effects on performance; however, the underlying mechanisms remain poorly understood, and the development of high-performance fracturing fluids remains a significant challenge. This study systematically examines the influence of potassium formate (HCOOK) and sodium bromide (NaBr) as weighting agents on the viscoelasticity of high-density HPAM hydrogels. The findings indicate that HCOOK exerts a more pronounced adverse impact on the viscoelasticity of HPAM hydrogels compared to NaBr. Molecular dynamics simulations reveal that the inferior viscoelasticity of the HCOOK-based polymer hydrogels is attributed to stronger supramolecular interactions between the crosslinker and HCOOK. This study develops an enhanced-performance high-density fracturing fluid with a density of up to 1.40 g/cm 3 , a maximum drag reduction rate of 75.1 %, and temperature tolerance up to 160 °C by integrating ultra-high molecular weight HPAM, a dual crosslinking strategy, and NaBr as weighting salt. This research not only provides fundamental insights into the complex interactions among weighting agents, crosslinkers, and polymers but also presents an enhanced-performance high-density fracturing fluid for ultra-deep hydrocarbon reservoirs.
研究领域:
高分子科学
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石油工程
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材料科学
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化学工程
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地质学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuailong Shen,Ziyi Guo,Wanmei Zhong,Jilin Zhang,Wenli Zhou,Liping Yu,Shixun Lian
All inorganic CsPbX 3 (X = Cl, Br, I) perovskite quantum dots (QDs) have excellent optical properties, and show great potential in optoelectronic devices, information storage, wide color gamut backlight display and other fields. In previous work, embedding CsPbBr 3 QDs into glass matrix through in-situ crystallization has become an important strategy to improve the stability of quantum dots. However, few reports have been made on the synthesis of high-quality whole family CsPbX 3 QDs glass by melt-quenching method. Herein, CsPbX 3 QDs glasses with full visible spectrum were synthesized by a closed melt-quenching technique. And the precise content of GeO 2 was used to regulate the size of glass network gaps to accommodate different sizes of CsPbX 3 QDs. The deconvoluted infrared spectra confirmed that the introduction of GeO 2 was beneficial to the increase of non-bridging oxygen in the rigid structure, the number and percentage of [BO 3 ] triangular units increased correspondingly, and the glass network changed in a three-dimensional and looser benign way, which was beneficial to the growth of large-size QDs. Finally, the luminescent properties of CsPbCl 2 Br, CsPbBr 3 and CsPbBrI 2 QDs glasses were improved respectively. The optimized CsPbX 3 QDs glasses have tunable luminescence in the full visible spectrum (414–692 nm), improved photoluminescence quantum yield (PLQY, ∼53.06 %) and longer decay lifetime, and excellent stability. Finally, the construction of a white light-emitting diode (WLED) device shows that CsPbX 3 QDs glass has potential applications in solid-state lighting.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Chen Li,Jijun Xiong,Jiang Zhao
The monitoring of humidity has elicited considerable interest in diverse fields. Nevertheless, the intricate nature of preparatory procedures employed for humidity sensors poses a formidable challenge in the pursuit of a streamlined, expeditious, and highly efficient technique for fabricating humidity-sensitive materials. Herein, the fundamental formation principle of polyimide (PI) film serves as the underpinning for the application of a swift and effective laser direct writing technique in creating a composite integrating MoS 2 nanoparticles anchored within nitrogen-doped laser-induced graphene (MoS 2 @NLIG). Subsequently, a rapid low-temperature oxygen plasma treatment is administered to enhance humidity sensing capabilities of the MoS 2 @NLIG composite. The oxygen plasma treatment-enhanced MoS 2 @NLIG humidity sensor exhibits exceptional capability in detecting relative humidity (RH) with a significant sensitivity of 61,219.97 Ω/%RH across an extensive range from 11% to 95%RH, while maintaining a hysteresis as minimal as 3.72%. Moreover, the sensor exhibits outstanding response and recovery times with respective values of 9 s and 15.5 s. Additionally, the humidity sensor demonstrates the capacity to identify human exhalation, potentially serving as a valuable electronic device for monitoring clinical respiration.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Zijian Zhang,Haoran Cui,Xin Wang,Jie Liu,Guangchun Liu,Xin Meng,Song Lin
Lumpectomy plus radiation is a treatment option offering better survival than conventional mastectomy for patients with early-stage breast cancer. However, successive radioactive therapy remains tedious and unsafe with severe adverse reactions and secondary injury. Herein, a composite hydrogel with pH- and photothermal double-sensitive activity is developed via physical crosslinking. The composite hydrogel incorporated with tempo-oxidized cellulose nanofiber (TOCN), polyvinyl alcohol (PVA) and a polydopamine (PDA) coating for photothermal therapy (PTT) triggered in situ release of doxorubicin (DOX) drug was utilized to optimize postoperative strategies of malignant tumors inhibition. The incorporation of TOCN significantly affects the performance of composite hydrogels. The best-performing TOCN/PVA7 was selected for drug loading and polydopamine coating by rational design. In vitro studies have demonstrated that the composite hydrogel exhibited high NIR photothermal conversion efficiency, benign cytotoxicity to L929 cells, pH-dependent release profiles, and strong MCF-7 cell inhibitory effects. Then the TOCN/PVA7-PDA@DOX hydrogel is implanted into the tumor resection cavity for local in vivo chemo-photothermal synergistical therapy to ablate residue tumor tissues. Overall, this work suggests that such a chemo-photothermal hydrogel delivery system has great potential as a promising tool for the postsurgical management of breast cancer.
研究领域:
生物医学工程
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癌症研究
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材料科学
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
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2024
·
IF 4.8
Jingliang Xu,Zhiyuan Wang,Asraful Alam,Leiyu Liu,Shen Zhang
This study presents a novel hydrophobic lignocellulosic bioplastic from corn stover reinforced by oxidized cellulose and in situ regenerated lignin. Cellulose-lignin mixture as a matrix was obtained by acid-recyclable deep eutectic solvent (DES) pretreatment of corn stover in mild conditions. Triethoxy(octyl)silane (C 14 H 32 O 3 Si) was employed to improve the water stability of the bioplastic by vapor deposition. The results show that the hydrophobic bioplastic has a high tensile strength, measuring 62.36 MPa. The water contact angle of the bioplastic was increased from 8.50° to 121.9° after hydrophobic modification. We prepared oxidized cellulose-reinforced cellulose paper by different particle size distributions of oxidized cellulose to investigate the reinforcement of oxidized cellulose. The tensile strength of oxidized cellulose cellulose paper increased from 14.41 to 21.18 MPa with the addition of oxidized cellulose. The zeta potential of oxidized cellulose is −47.99 mV, which shows a more negative charge due to carbonyl groups. The repulsive force of oxidized cellulose contributes to the formation of a brick-and-mortar microstructure with cellulose-lignin mixture. It demonstrates that oxidized cellulose can act as bio-adhesives and has a good toughening effect on the mechanical properties of bioplastic. Highlights Lignocellulosic bioplastic was prepared by DES pretreatment of corn stover. Oxidized cellulose was used to reinforce the lignocellulosic bioplastic. The tensile strength of the bioplastic was 62.36 MPa after the reinforcement process. Trieth-oxy(octyl)silane was employed to improve water stability. The water contact angle of the bioplastic was increased from 8.50° to 121.9°.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiao Jin,Min Zheng
In view of the important influence of Sn 4+ and ascorbic acid (AA) on environmental pollution and human health, the establishment of an effective method to achieve rapid and highly sensitive detection is urgently needed. Herein, orange fluorescent (FL) carbon dots (CDs) were successfully prepared from 1,2,4,5-benzenetetramine tetrahydrochloride and thiourea via solvothermal approach. CDs can serve as FL sensors for detecting Sn 4+ and AA, the detection limit is 0.13 and 0.41 μM, respectively, through a signal on–off–on mode. Furthermore, the practicability of CDs nanoprobes is validated by the successful identification of Sn 4+ and AA in live cells, real water samples and medicine. The present work comfirms the feasibility of employing CDs as FL probes to effectively and selectively detect Sn 4+ and AA, which presents a potential approach for on-site detection of Sn 4+ and AA in various environment and biological systems with exceptional sensitivity.
研究领域:
环境科学
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分析化学
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生物医学
✓ 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）