COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xiaoguang Zhang,Lixia Xiong
Spray droplet size is an important factor affecting spray drift, which is directly related to the spray effect and efficiency by unmanned aerial vehicle . Effect of adjuvants on the droplet size of emamectin benzoate dilute emulsion was systematically investigated by measuring droplet size, dynamic surface tension , and rheology. The results showed that droplet size was independent of dynamic surface tension and viscosity, but was related to the viscoelastic property and strain. For the emulsions with N, N-dimethyldodecylamine-N-oxid (OA), polyalkoxylated butyl ether (LQ) and poly (vinyl alcohol) (PVA), the viscous modulus (G′′) were higher than elastic modulus (G′) under the crossover frequency, indicating that the emulsions were the viscous liquid. Furthermore, the diluted emulsions with OA and LQ had small drop, while that with PVA had big drop. These leaded to the breakup of the liquid sheet at lower deformation and the small spray droplet formation. While emulsions containing Guar gum 2-hydroxy-3-(trimethylammonio) propyl ether chloride (Gum Cl) and Sil800 (silicone adjuvant) exhibited a weak elastic behavior, and had the large droplet size. In addition, compared to the emulsions with OA, LQ and PVA, the dilute emulsions with Gum Cl and Sil800 had the large drop diameter, and G′ had a rapid decrease at bigger strain. This suggested the dilute emulsions with Gum Cl and Sil800 had a high stability during atomization . The study would provide a useful guide for selecting drift control adjuvants and raising pesticide efficiency.
研究领域:
农学
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农药科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2023
·Vol. 13
·期 4
·457
·
IF 2.5
Chenyu Fan,Liuyi Ren,Yimin Zhang,Shenxu Bao,Zhilu Yang
In this paper, different doses of sodium hexametaphosphate (SHMP) were added as grinding aids in the process of muscovite grinding, and the effect of SHMP on the grinding efficiency of muscovite was studied. The grinding experiment results show that the grinding efficiency increases significantly with the increase in SHMP dosage. The mechanism of SHMP improving the grinding efficiency of muscovite was analyzed by various test methods. Experimental results showed that when SHMP was used as a grinding aid, the ordered structure of muscovite crystals was destroyed, the surface of muscovite was roughened, and obvious cracks appeared. SHMP was physically adsorbed on the muscovite powder, which effectively improved the pulp environment of muscovite powder during grinding, resulting in more dispersed muscovite powder, and improved the grinding efficiency. This study provides theoretical guidance for the efficient preparation of fine-grained muscovite powder and the action mechanism of grinding aids.Keywords:grinding aids;muscovite;sodium hexametaphosphate;pulp dispersibility
研究领域:
矿物加工工程
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材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Lei Ding,Xuan Zhou,Xiaojie Liang,Yujin Dong,Cunbao Fang,Yueming Wu,Beixing Li,Wei Mu,Jin Lin,Yuekun Li
Pesticide residue has become the main technical barrier that restricts the export of Chinese wolfberry. Can we achieve high efficacy and low safety risk by balancing pesticide deposition on the leaves and fruits of Chinese wolfberry? In this research, the structural characteristics and wettability of leaves and fruits of Chinese wolfberry at different growth stages were studied. The adaxial and abaxial surfaces of leaves were hydrophobic, whereas the fruit surfaces were hydrophilic. Adding spray adjuvant could increase the retention of droplets on the leaf surfaces of Chinese wolfberry by 52.28–97.89% and reduce the retention on the fruit surfaces by 21.68–42.14%. A structural equation model analysis showed that the adhesion tension was the key factor affecting the retention of the solutions among various interface behaviors. When the concentrations of Silwet618, AEO-5, Gemini 31551, and 1227 were 2–5 times higher than their CMCs, the retention of pesticide solutions (pyraclostrobin and tylophorine) on Chinese wolfberry leaves significantly increased, and the control efficacies on aphids and powdery mildew also dramatically improved (65.90–105.15 and 41.18–133.06%, respectively). Meanwhile, the retention of pesticides on the fruit of Chinese wolfberry was reduced. This study provides new insights into increasing the utilization of pesticides in controlling pests and improving food safety.
研究领域:
植物保护
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 5
·2290-2298
·
IF 2.7
Xuewei Zhang,Jing Ye,Zhigang Ni,Xuerui Yang,Yuefei Ji,Jean-Marc Chovelon,Guangli Xiu,Lei Zhou
Kresoxim-methyl (KM), an extensively used strobilurin fungicide, displays broad-spectrum fungicidal activity. Despite its prevalent application in agriculture and frequent detection in the environment, specific studies on the photolytic fate of KM in natural surface waters are quite limited. To address this, the present study delves into the photochemical transformation of KM under light irradiation using a high-pressure mercury lamp. Photodegradation of KM followed pseudo-first-order kinetics, with a degradation rate constant of 0.067 ± 0.005 h−1, corresponding to a half-life of approximately 10.3 ± 0.7 h, and the quantum yield was estimated to be 6.95 × 10−3. Transient species identification experiments demonstrated the involvement of singlet oxygen (1O2) and singlet (1KM*) and triplet (3KM*) states. Four different photodegradation pathways, i.e., photoisomerization, hydrolysis, hydroxylation, and ether cleavage, were proposed. Toxicity assessments demonstrated that photodegradation effectively reduced the ecotoxicity of KM. Two typical pesticide adjuvants, namely, Tween 20 and sodium dodecylbenzenesulfonate (SDBS), were selected to evaluate their impacts on KM photolysis. While Tween 20 exhibited a remarkable increase in the photodegradation of KM, SDBS showed a concentration dependent behavior, with an inhibitory effect at low concentrations (<200 μM) and promotional effects at higher concentration levels. The present study elucidated the photolytic KM degradation mechanism, as well as its possible inhibition and enhancement, which is of significant importance for evaluating the environmental fate and ecotoxicological risks of KM in sunlit surface waters.
研究领域:
环境科学
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农药化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xuanzhi Chen,Yehua Li,Yujie Qi,Pengjin Huang,Haidong Wu,Xin Deng,Shanghua Wu
In this study, self-synthesized Gd 3 Si 2 C 2 and MgO were used as sintering aids to fabricate Si 3 N 4 ceramics via gas-pressure sintering. The results indicated that Gd 3 Si 2 C 2 reacted with inherent SiO 2 on the Si 3 N 4 surface to form Gd 2 O 3 and β-Si 3 N 4 in situ, thereby increasing the N/O ratio of the liquid phase. In addition, in situ β-Si 3 N 4 induced grain growth, enhancing the thermal conductivity of Si 3 N 4 ceramics while maintaining excellent mechanical properties. Compared to the samples with Gd 2 O 3 and MgO as sintering aids, those with Gd 3 Si 2 C 2 and MgO as sintering aids demonstrated superior overall performance with the thermal conductivity, bending strength, fracture toughness, and Vickers hardness of 101.96 W⋅m −1 ⋅K −1 , 848.26 ± 4.66 MPa, 6.23 ± 0.15 MPa⋅m 1/2 , and 16.56 ± 0.43 GPa, respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaole Yu,Xingkai Zhou,Bangze Wu,Bochang Shi,Yaowei Mi,Zhexiang Yu,Zhanheng Jin,Zenan Zhao,Bingyu He,Han Chen,Yifeng Zheng,Lin Ge
Various approaches have been developed to address the challenges of difficult densification in traditional BaZrO 3 -based and BaCeO 3 -based protonic ceramic fuel cells (PCFCs) electrolytes. The addition of sintering additives, the most widely used approach, has been found to potentially compromise electrical performance while improving sinterability in traditional sintering. Recently, SrSn 0.8 Sc 0.2 O 3- δ (SSS) has emerged as a promising proton-conductor material; however, there is still space for improvement in its electrical and sintering properties. In this study, a systematic investigation was conducted into the effect of sintering additives (NiO, ZnO, CuO) on the electrical performance of the new proton conductor SSS. Notably, SSS-1wt%NiO was found to decrease the sintering temperature from 1600 °C to 1400 °C (reaching 92 % relative density) and increase protonic conductivity from 2.61 × 10 −3 S cm −1 to 3.06 × 10 −3 S cm −1 at 600 °C, without any increase in electronic conductivity. This demonstrates a synergistic beneficial effect on both sinterability and electrical properties. Furthermore, the Ni-SSS|SSS-1wt%NiO|SSS-BCFZY single cell achieved the highest peak power density (528.5 mW cm −2 at 800 °C), surpassing all the other SSS-based single cells. Therefore, the addition of NiO to the SSS electrolyte demonstrates the significant sintering and electrical properties of SSS, proving evidence for the potential commercial application of SSS electrolytes for PCFCs.
研究领域:
材料科学
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燃料电池研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Feng Mao,Xiaoxin Zhang,Qingzhi Yan
The application scope of advanced ceramics is significantly limited due to their inherent brittleness, making the enhancement of fracture toughness a critical area of research. Although the incorporation of SiC whiskers (SiCw) has been shown to effectively improve fracture toughness, a high content of whiskers complicates the densification process. Herein, we discovered that the addition of SiCw can react in-situ with sintering additives, enabling SiC ceramics to achieve densification while incorporating a substantial quantity of whiskers. We systematically investigated the effects of stacking faults in SiC whiskers on the densification and microstructure of ceramics. SiCw with stacking faults reacted with sintering additives, leading to improved densification and refined grains. In contrast, whiskers without stacking faults maintained a rod-like structure within the ceramic matrix, resulting in whisker debonding and pull-out. When 40 vol.% SiCw was added, the optimized flexural strength and fracture toughness can reach 885 MPa and 8.94 MPa·m 0.5 , respectively.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 17
·14879-14885
·
IF 2.22
Niu Shuting,Jiang Juan,Wang Jinzhao,Gan Lin,Zhang Tianjin
0.67CaTiO 3 –0.33LaAlO 3 (CTLA) microwave dielectric ceramic materials with the additives of H 3 BO 3 , Li 2 CO 3 or H 3 BO 3 –Li 2 CO 3 were prepared by a conventional solid-state reaction method. The effects of the sintering additives on the densification behavior, phase compositions, microstructures, and microwave dielectric properties of the CTLA ceramic samples were investigated. It was found that the binary additive of H 3 BO 3 –Li 2 CO 3 effectively promoted the densification and lowered the sintering temperature of the CTLA ceramic samples without a significant decrease in their Q × f values. For example, with an addition of 0.2 wt% H 3 BO 3 –0.1 wt% Li 2 CO 3 , the optimal microwave dielectric properties of ε r = 45.5, Q × f = 31,771 GHz and a near-zero τ f of 2.43 ppm/℃ were obtained in the CTLA ceramic sample sintered at only 1175 ℃, which is significantly lower (~ 225 ℃) compared to the sintering temperatures of conventionally sintered CTLA ceramics.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 3
·512
·
IF 3.2
Zechi Ma,Zixuan Yuan,Zhonghua Yao,Jiangxue Chen,Hua Hao,Minghe Cao,Hanxing Liu
Piezoelectric materials (PZTs) enjoy extensive applications in the field of electromechanical sensors due to their sensitive response to external electric fields. The limited piezoelectric response for single-layer piezoceramic pellets drives the use of multilayered technology to increase the electric displacement of a single piezo device. As is well known, Ag is commonly used as a metal for electrodes in devices based on traditional PZTs, which always densify at a high temperature above 1100 °C, resulting in Ag migration. Here, a high-performance samarium-ion-doped Sm0.01Pb0.99(Zr0.54Ti0.46)O3ceramic was selected as parent materials to develop a new Ag-cofired ceramic matrix with a sintering temperature of 920 °C by glass flux. The ceramic composition with 2.0 wt% glass addition exhibits the excellent performance of piezoelectricd33~492 pC/N, planar electromechanical coupling coefficientkp~50.1%, mechanical quality factorQm~68.71, and Curie temperatureTc~356 °C, respectively. The cyclic stability ofd33was measured below 6.6% at 30 kV/cm, which indicates that the piezoceramic has good temperature stability and fatigue resistance. Therefore, this study provides a novel high-performance piezoelectric system to meet the cofired requirement for multilayered piezoelectric devices.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Zilu Li,Xingyu Zhang,Yue Wang,Zirui Zheng,Chenhui Zhang,Tianyue Wu,Yanling Wu,Yuxia Gao,Fengpei Du
Glyphosate, one of the most widely used herbicides, plays an important role in controlling weeds and ensuring crop production. While using glyphosate, adjuvants are commonly added to improve its deposition on weeds and control efficacy. However, changes in weed leaf surface characteristics may reduce glyphosate penetration and contribute to evolved glyphosate resistance. Therefore, it is significant to introduce an improved method for regularizing leaf surface characterization and guide adjuvant selection to improve glyphosate efficacy. In this work, surface characteristics of typical weed leaves have been systematically investigated by 3D surface analysis and scanning electron microscopy, finally quantified by apparent surface free energy (ASFE) due to its comprehensive and quantitative evaluation of leaf surfaces. Moreover, the relationship between the weed leaf surface characteristics and the retention of glyphosate on weeds was established, further related to the control efficacy against weeds. To maximize the utilization rate of glyphosate, the types and concentrations of adjuvants should be regulated according to the ASFE of weeds. Our findings not only regularize the surface properties of weed leaves but also reveal their influencing mechanism on the deposition and biological activity of glyphosate, which provide effective guidance for the use of glyphosate.
研究领域:
植物学
·
农学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiangxing Xu,Xianzhou Ning,Faqin Dong,Xiaoyong Yang,Wei Zhang,Bin Ye,Zhiguo Yang,Guoqiang Zhao,Chuan Zeng,Yushan Yang
In this paper, we present a productive low-temperature fabrication of Cs-hollandite ceramics by adding Bi 2 O 3 as a sintering aid to achieve high cesium retention. The effects of Bi 2 O 3 addition on the phase composition, crystal structure and aqueous stability of the stoichiometric Ba 0.9 Cs 0.3 Cr 2.1 Ti 5.9 O 16 ceramic waste form were investigated. It was found that adding Bi 2 O 3 can effectively reduce the sintering temperature and promote densification of Cs-containing hollandite products. The Cs-hollandite ceramic with 2 wt% Bi 2 O 3 sintered at 1000 °C showed a single phase with > 98 % cesium retention, which was ∼ 200 °C lower and ∼ 11 % retention rate higher than those of reported Cs-bearing hollandite. Moreover, the leached sample remained stable tetragonal structure, the LR Cs was in the order of 10 -3 g·m - 2 ·d -1 after 28 days and the leaching indexes > 8, exhibiting good aqueous stability. This route can be considered as a promising solution to prevent cesium loss for incorporating the cesium waste in ceramic hosts.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Xiaoye Liu,Xiangkun Kong,Wenyi Xiang,Yining Jiang,Bingqinq Xiong,Weiwei Ping,Changrong Xia,Daoming Huan,Chengwei Wang
Garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) has high ionic conductivity and good compatibility with lithium metal. High-temperature processing has been proven an effective method to decrease the interface resistance of cathode|LLZO. However, its application is still hindered by the interlayer co-diffusion with the cathode and high sintering temperature (>1200 °C). In this work, a new garnet-type composite solid-state electrolyte (SSE) Li 6.54 La 2.96 Ba 0.04 Zr 1.5 Nb 0.5 O 12 -LiCoO 2 (LLBZNO-LCO) is firstly proposed to improve the chemical stability and electrochemical properties of garnet with high-temperature processing. Small doses of LCO (3%) can significantly decrease the LCO|SSE interface resistance from 121.2 to 10.1 Ω cm 2 , while the sintering temperature of garnet-type LLBZNO decreases from 1230 to 1000 °C. The all-solid-state battery based on the sintered LLBZNO-LCO SSE exhibits excellent cycling stability. Our approach achieves an enhanced LCO|SSE interface and an improved sintering activity of garnet SSE, which provides a new strategy for optimizing the comprehensive performance of garnet SSE.
研究领域:
材料科学
·
电化学
✓ 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）