Toxics
·
2025
·Vol. 13
·期 5
·395
·
IF 4.1
Feihu Qin,Nanjing Zhao,Gaofang Yin,Yunfei Luo,Tingting Gan
The agricultural production process contributes to the global issue of pesticide pollution. Based on the static toxicity test of diuron (DCMU) onDaphnia magna(D. magna) for EC50-48 h, a concentration range of 0.2 to 1 mg/L was set as sublethal concentrations, while lethal concentrations were set at 2 mg/L and 4 mg/L. This study analyzes the toxic response patterns of the swimming behavior indicators ofD. magnaexposed to different concentrations of DCMU. The results showed that the average speed (V) ofD. magnadecreased step by step with exposure time, regardless of exposure to sublethal concentration or lethal concentration. However, during the same short-term exposure period, the V ofD. magnaat lethal concentration was higher than that at sublethal concentration, which indicates that the swimming behavior ofD. magnaexposed to DCMU may be stimulated and accelerated. Compared to the control group, there is a statistically significant difference in the V ofD. magnaafter short-term exposure, especially showing an extremely significant difference after 5 min of exposure. Evidently, compared to the traditional 48 h static toxicity testing method, the swimming behavior indicators ofD. magnashow a more sensitive response to DCMU after 5 min of exposure, making it more suitable for rapid toxicity detection. By expanding the range of exposure concentrations, it was found that the V indicator ofD. magnaresponded significantly to a DCMU concentration of 0.05 mg/L after only 5 min of exposure, and a high degree of correlation was observed between the indicator and the exposure concentration. Through nonlinear fitting, the relationship between V and the dose–effect of DCMU toxicity presents an S-shaped curve, with R2> 0.9. Consequently, it becomes possible to study the dose–effect relationship between the changes in the swimming behavior indicators ofD. magnaand the stress concentration based on this theory. This further establishes a foundation for the development of comprehensive aquatic toxicity rapid detection technology based on the toxic response of swimming behavior indicators.
研究领域:
环境科学
·
毒理学
·
水生生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2019
·
IF 5.839
Xianling Wei,Jing Li,Bin Li
The objective of this study was to investigate the effect of concentration of wheat starch (WS) and mass ratio of tannic acid (TA) to WS on interaction between TA and WS, using isothermal titration calorimetry (ITC), UV–vis spectrophotometer and dynamic light scattering (DLS). The interaction process and structural properties of complexes formed with different mass ratios of TA to WS ranged from 0.8 to 2.4 were also investigated through X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and rheological measurements. The results of turbidity, particle size and ITC revealed that TA added into WS could spontaneously form complexes through three steps with the increasing of TA/WS ratio. They were assigned to (i) interaction of TA with WS forming soluble complexes; (ii) propagation and formation of insoluble complexes via cross-linking these soluble complexes; and (iii) lateral association of soluble/insoluble complexes, generating larger aggregates even precipitation. The interaction process would be delayed with decreasing the WS concentration. The results of SEM further revealed the three-step interaction process and showed that the TA/WS complexes appearance was approximately spherical. The results of dynamic rheological, TA loading amount and XPS showed that the complexes had highly intermolecular cross-linked gel-like network structures and contained lower TA inside and higher TA outside.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
APL Materials
·
2024
·Vol. 12
·期 9
·
IF 5.3
Shen Tiantian,Zhao Shanshan,Su An,Liu Haisheng,Chen Fayi,Li Benchun,Han Xinxin,Yu Dechao,Zhang Dawei
The Pr 3+ ion has been widely doped into various materials as a red and near-infrared (NIR) emitting center for applications in lighting and solar spectrum downconversion. Herein, the preparation of a new library of Pr 3+ -doped Sr 2 Al 2 GeO 7 phosphors was proved by powder x-ray diffraction patterns and Rietveld refinements and characterized by a scanning electron microscope with energy-dispersive x-ray spectrometry. The Sr 2 Al 2 GeO 7 :Pr 3+ sample strongly absorbs blue photons over 420–500 nm and yields intense visible emissions with dominant peaks around 490 nm from the Pr 3+ 3 P 0 → 3 H 4 transition, as well as robust NIR emission bands over 800–1200 nm. In addition to the typical transitions of 1 D 2 → 3 F 2 at 880 nm, 1 G 4 → 3 H 4 at 1000 nm, and 1 D 2 → 3 F 3,4 at 1070 nm, the distinguishable NIR emission at 929 nm was demonstrated from the 3 P 0 → 1 G 4 transition via static and dynamic spectroscopic analysis. Most interestingly, for the 3 P 0 blue-excited state, a considerably elevated concentration of about 10%Pr 3+ was optimal for the visible/NIR emissions, in stark contrast to the diluted optimal 1%Pr 3+ for the 1 D 2 state. The relevant cross-relaxation from the 3 P 0 and 1 D 2 states between Pr 3+ was comprehensively treated by theoretical speculations and experimental results. Such concentrated Pr 3+ blue activators would significantly facilitate the blue-to-NIR downconversion through a desired two-step sequential transition from the 3 P 0 initial state to the 1 G 4 intermediate level for quantum efficiency exceeding unity. The current results would consolidate the basis of concentrated Pr 3+ donors to promote the novel Pr 3+ /Yb 3+ codoping downconversion for greatly increasing Si solar cell efficiency.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Energy Science & Engineering
·
2023
·Vol. 11
·期 12
·4481-4492
·
IF 3.8
Hao Zhu,Liwen Fan
The understanding of the enhanced thermal conductivity mechanism in nanofluids remains elusive, underscoring the necessity for investigating their influence on heat conduction. A comparative analysis was carried out on the overall heat transfer coefficients of SiO 2 , TiO 2 , MgO, ZrO 2 , CeO 2 , Al 2 O 3 , and Fe 3 O 4 , yielding 346.5, 442.9, 569.2, 465.6, 663.2, 562.4, and 706.2 W/m 2 K, respectively. Our investigation further extended to the differential impacts of various nanofluids on heat transfer conduction coefficients, with Fe 3 O 4 nanofluids demonstrating the greatest, and SiO 2 the least, heat transfer coefficients. Importantly, these nanofluids play a cooperative role in enhancing heat transfer coefficients. Previous studies have largely concentrated on the effects of individual and mixed nanofluids on overall heat transfer coefficients, neglecting the combined effects of different nanofluids. Moreover, the mechanisms underlying these effects remain vague, with insufficient corresponding characterizations. Our study seeks to address these limitations. We also studied the impact of nanofluid concentration, pH, and temperature on heat conduction. Our results suggest that the overall heat transfer coefficient escalates with increasing nanofluid concentration and temperature. For example, the overall heat transfer coefficients for SiO 2 nanofluids surged from 346.5 W/m 2 K at 25°C to 369.4 W/m 2 K at 35°C, 411.4 W/m 2 K at 45°C, and 427.6 W/m 2 K at 55°C. A rise in pH also led to an increase in overall heat transfer coefficients up to a certain point, after which they started decreasing. The zeta potentials of the aforementioned nanofluids were −12.1, −24.8, −28.6, −23.2, −35.9, −31.3, and −40.4 mV, respectively, and these potentials dwindled with an increase in pH. The influence of nanofluids on overall heat transfer may have implications for the enhanced oil recovery effect.
研究领域:
热力学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 2.467
Rui Li,Nian Fu,Zhaoliang Wu,Yanji Wang,Yanyan Wang
In foam fractionation of proteins, a clear understanding of their aggregation induced by the gas-liquid interface has great importance to reducing the loss of their bioactivity. In this work, the effects of the concentration of bovine serum albumin (BSA) on its aggregation induced by the gas-liquid interface were investigated at the molecular level to clearly explain how this protein aggregated in foam fractionation. The results show that reducing the BSA concentration made the protein structure more unfolded so that it enhanced the protein aggregation induced by the gas-liquid interface. In foam fractionation, the BSA aggregates were mainly formed in the desorption of the BSA molecules from the gas-liquid interface. Their formation was closely related to the BSA enrichment ratio. In the concentration from 0.05 g/L to 0.20 g/L, the highly unfolded BSA structure and the high enrichment jointly resulted in the formation of insoluble aggregates.
研究领域:
生物化学
·
蛋白质工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jing Wen,Jiayi Wang,Jiamin Sun,Baichao Zhang,Chao Suo,Jing Cui,Xuchuan Cao,Yaxin Yang,Yuexian Hao,Shaohui Guo,Xiaojian Bai,Xian-Ming Zhang
Non-extra-artificial destructive detection of trace residual detached wall painting pigments is an important prerequisite for wall paintings restoration work. As the amount available for detection of artifacts is relatively small, the relevant information must be derived through microanalysis. To this end, the trace molecules can be concentrated and enriched for surface-enhanced Raman scattering (SERS). In this work, the ZIF-67 was Ni 2 + -acid etched into Co–Ni layered double hydroxide (LDH) hollow nanocages. After introducing Au nanoparticles (NPs), Au NPs@Co–Ni LDH core–shell structured composites with a very low detection limit for RhB (10 –10 mol L −1 ) were formed. The composites were applied to non-extra-artificial destructive detection of green, red, and blue trace mural mineral pigments, in which the main components were identified as chlorocopperite, vermilion and ultramarine, respectively. This result proves the universality of the composites to mural pigments of different types in different regions. Experimental data and finite element simulation results show that the etching treatment endowed the SERS substrate materials with a concentration effect, which led to more molecules of the substances to be measured aggregating around the Au NPs, enhanced the detection signals of the molecules, and achieved the concentration in the plasmonic field, which in turn improved their adsorption capacity and enrichment function of the target molecules. This work realizes the innovative application of the concentration effect in the SERS detection of ancient mural pigments, which is important for the analysis, identification, and restoration of mural paintings and other cultural relics.
研究领域:
材料科学
·
文物保护
·
化学分析
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Fang Liu,Yuan-yuan Lin,Chuan-jia Jiao,Zhao-hua Xu,Dong-hua Xu,Shi-fang Luan
Polyborosiloxane (PBS) is often referred to as a “shear thickening/stiffening gel” or “dilatant compound”, sometimes actually meaning an increase in modulus with frequency/strain rate rather than the rheological definition of “dilatant compound”, i.e. an increase in viscosity with shear rate. The shear behaviour of bulk PBS and PBS solution has been studied here by steady shear experiments, and it is observed that PBS exhibits shear thickening behaviour only under certain conditions. The shear behaviour of bulk PBS depends on the degree of reaction of the PBS ( i.e. the content of B in the PBS). For PBS solution, the shear behaviour is influenced by the concentration of the solution and the type of solvent (with or without oxygen atom in the solvent). The shear behaviour of PBS systems is related to shear induced structural changes, where the formation of new elastically active B:O dynamic dative bonds (interchain cross-linking) contributes to shear thickening.
研究领域:
材料科学
·
化学工程
·
力学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·
IF 4.2
Yutong Hong,Mengqi Lyu,Ming Jiang,Yanyan Chen,Jiajun Zhao,Haipeng Zhu,Yan Xia
The utilization of polymer conformations to construct a variety of superlattices is a common method within the field. However, this technique often results in only long-range ordering rather than the formation of distinct superlattices. In this study, a well-organized array of discrete pancake-shaped superlattices (DPSs) is successfully obtained through the utilization of air–liquid interface self-assembly, facilitated by the confined environment created by a block copolymer. It is crucial to note that both the self-assembly behavior and resulting morphologies of the DPSs can be precisely tuned by adjusting several experimental parameters, most notably the concentration and molecular architecture of the block copolymers. Furthermore, this work provides valuable insights into the formation processes and mechanisms underpinning the DPSs. The approach described here is both straightforward and efficacious, establishing a strong foundation for subsequent research and the development of non-close-packed superlattice structures.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 15
·8255-8263
·
IF 6.123
Zhou Zhijun,Yao Yongbo,Zhang Junfeng,Shen Liangen,Xu Huawei,Liu Jie,Shentu Baoqing
2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidized cellulose nanofiber (TEMPO-CNF)/poly (vinyl alcohol) (PVA) suspension can be used to prepare composite. Therefore, understanding the viscoelastic property of TEMPO-CNF/PVA suspension is necessary. The analysis of the rheological date from static and dynamic rheology indicates that the suspension is pseudoplastic fluid with thixotropic behavior. When the concentration of PVA is in the dilute regime, the gel like behavior of the suspensions turns to liquid like state with the increasing frequency. Such behavior is correlated with the entangled network among cellulose fibrils and the hydrogen bond interaction between TEMPO-CNFs and PVA. When the concentration of PVA is in semidilute and entangled regime, the suspensions show liquid character, because the viscosity of the suspensions are mainly determined by the entanglement of PVA molecules in homogeneous state. Furthermore, the TEMPO-CNF/PVA membranes were prepared by solution casting method. The Fourier transform infrared spectroscopy and atomic force microscope data proved the interaction between TEMPO-CNFs and PVA. This research reveals the importance of PVA concentration on the fluid characters of TEMPO-CNF/PVA suspensions, providing the approach to adjust the viscosity of TEMPO-CNF suspensions. Graphical abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Ling Zhang,Xiang Li,Xianbing Xu,Liang Song,Anqi Bi,Chao Wu,Yunjiao Ma,Ming Du
Emulsions with reduced fat and natural stabilizers are currently prevalent. Herein, semisolid emulsions with an oil phase of 50 % were successfully prepared using cellulose nanofibrils from mushroom stipes as stabilizers. Cellulose nanofibrils obtained by high-pressure homogenization were dendritic-like and possessed a contact angle of 70.50 ± 0.41°. The rheological properties and stability of emulsions increased significantly as nanocellulose concentrations increased from 5 to 20 mg/mL, while nanocellulose at 25–30 mg/mL significantly reduced the storage stability and anti-lipid oxidation ability of emulsions. The microstructure of semisolid emulsions demonstrated that nanocellulose fibers at 20 mg/mL could stabilize emulsions by forming compact interfacial films around droplets and creating intensive bridging networks between neighboring droplets, while nanofibers at concentrations over 20 mg/mL easily clustered in the aqueous phase, making the droplets more susceptible to aggregation and demulsification. The results demonstrate that cellulose nanofibrils from mushroom byproducts have the potential to stabilize semisolid food-grade emulsions.
研究领域:
食品科学
·
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Ruixiang Wu,Rongli Guo,Jiacheng Tang,Zhiliang Han,Shengzhi Wang,Bin Li,Xiangyang Miao
Conjugated polymers exhibit significant application potential in the field of organic optoelectronic devices owing to their unique photophysical properties. Poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene) (MDMO-PPV) presented a distinct photoluminescence (PL) emission at the different concentration. The two PL components of intra- and inter-chain emissions at 556 nm and 592 nm can be adjusted. Ground state bleaching and stimulated emission features were observed below and after 524 nm in the transient absorption spectrum of the low MDMO-PPV concentration. As the concentration increased, the ground state bleaching feature red-shifted, indicating a reduction of the band gap. At high concentrations, intra-chain charge transfer was substituted by the inter-chain charge transfer. The lifetime of inter-chain emission turned increased due to the charge aggregation.
研究领域:
高分子物理
·
光物理学
·
有机电子学
·
材料科学
·
光电功能材料
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2019
·Vol. 230
·期 3
·1-15
·
IF 1.774
Sun Qi,Lu Jian,Wu Jun,Zhu Guangcan
Huge amounts of natural bischofite (MgCl 2 ∙6H 2 O) resulting from the mining process of salt lakes often cannot be utilized effectively and are discarded; techniques for reutilization of the discarded bischofite as magnesium resources are limited. The nano-magnesium hydroxide (nano-Mg(OH) 2 ) synthesized from natural bischofite was firstly used as catalyst for ozonation of antibiotics including sulfathiazole (ST), ofloxacin (OFL), and tetracycline (TC). Rapid ozonation of ST, OFL, and TC was achieved using nano-Mg(OH) 2 as catalyst. The removal rate constant of OFL in the catalytic ozonation treatment (k OFL = 0.512 min −1 ) was nearly 2.1 times higher than the single ozonation (k OFL = 0.249 min −1 ). The removal rate constant of ST and TC increased by 23.5% and 32.8% from 0.298 min −1 and 0.384 min −1 to 0.368 min −1 and 0.510 min −1 , respectively, when the catalyst was added into the reaction system. The removal rate constant of ST sharply increased from 0.259 to 0.604 min −1 when the reaction temperature increased from 15 to 35 °C while those of OFL and TC changes slightly. The removal efficiency sharply decreased when the initial concentration of ST, OFL, and TC increased from 10 to 500 mg L −1 . Both anions and cations could inhibit the removal of ST, OFL, and TC at relatively higher concentrations. The prepared nano-Mg(OH) 2 catalyst could maintain its catalytic activity in the repeated use process. High removal efficiency of typical antibiotics and heavy metals free indicated that nano-Mg(OH) 2 from natural bischofite is a promising ozonation catalyst in terms of antibiotics removal.
研究领域:
环境科学
·
化学工程
·
材料科学
·
废水处理
✓ 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）