JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shuo Lu,Qiliang Mei,Jiayi Chen,Zhe Wang,Wenhong Li,Chunyan Feng,Xuefeng Li,Jinfeng Dong
Hypothesis Shear-thickening micelles were mostly made of cationic surfactants , but shear-thickening was rarely reported in the zwitterionic/anionic surfactants. Since wormlike micelles were essential in shear-thickening systems, it should be common for the hybrid wormlike micelles formed by zwitterionic/anionic surfactants, and their fundamental features need to be clarified. Experiments The micellization of zwitterionic surfactant homologies alkyl dimethyl amidopropyl hydroxyl sulfobetaine (AHSB) and sodium dodecyl sulfate (SDS) in brine was studied, and various environmental factors were considered systematically. Light scattering, rheology, zeta potential , 1 H NMR and cryo-TEM techniques were employed to characterize the AHSB/SDS wormlike micelles. Findings AHSB/SDS hybrid wormlike micelles were formed in a wide x SDS region to endow them with apparent viscosities, in which the electrostatic and hydrophobic interactions between AHSB and SDS molecules were critical. AHSB with the longer tail, the higher c AHSB and c NaCl were advantageous to enhance the viscosity because of the longitudinal growth of wormlike micelles. The shear-thickening AHSB/SDS samples were commonly composed of unbranched wormlike micelles with various length, and the shear-induced alignment of wormlike micelles was the major cause as verified by cryo-TEM. Moreover, the quantitative relationships on the critical shear rate ɣ̇ c were established, and the activation energies were obtained from the temperature-dependent ɣ̇ c .
研究领域:
物理化学
·
材料科学
·
界面化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Xiang Zhou,Dingding Zhu,Yong Su,Feixiang Wu,Xiaolei Ren,Xuedong Zhang,Xiangze Ou,Yaling Rao,Long Xie,Liang Tang,Jianyu Huang,Qiao Huang
Metal fluorides (MFs) are regarded as high-capacity conversion cathode materials for next-generation lithium-ion batteries with high energy density. However, these cathodes suffer from poor electronic conductivity, sluggish reaction kinetics, and deleterious cathode solid electrolyte interface (CEI) formation, which may cause rapid cell degradation upon cycling. Herein, a low temperature chemical vapor deposition (CVD) carbon coating technology is successfully achieved to coat MFs-FeF 2 with a thin amorphous carbon layer, which promotes the formation of a stable CEI with improved electronic and ionic transport property. Consequently, a discharge capacity higher than 450 mAh g −1 of the CVD coated FeF 2 is achieved with a capacity retention at about 75% after 2500 cycles in a saturated electrolyte. Moreover, an unprecedented cycling performance with the discharge capacity of 350 mAh g −1 after 500 cycles in a super diluted electrolyte is also achieved. Advanced cryo-electron microscopy reveals that the carbon coating significantly suppresses the undesirable CEI formation and promotes the formation of a thin CEI with excellent chemo-mechanical property. This work provides a feasible technology to stabilize the important interface on MFs and offers a new strategy to accelerate the commercial adoption of such cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Huafei Cai,Yonggang Jiang,Qu Chen,Sizhao Zhang,Liangjun Li,Junzong Feng,Jian Feng
The direct in situ TEM imaging method is adopted to investigate the sintering behavior of SiO 2 aerogels during the rapid heating process. The structural evolution of SiO 2 aerogels and composites at different times during the heat treatment process are further investigated via SEM, FT-IR, BET and XRD . The results indicate that the shrinkage of the SiO 2 aerogels and composites primarily occurs during the initial stage of the heating process (within 20 min) with the shrinkage primarily linked to the fusion of small aerogel particles at high temperatures. The aerogel structure then stabilizes with no further shrinkage observed as the heating process continues. The heat treatment process only promotes the space rearrangement and fusion of small aerogel particles with no observed changes to the amorphous structure of the aerogels, and the small-sized particles fusion was the main causes for the structural evolution of SiO 2 aerogels and composites under rapid heating condition.
研究领域:
材料科学
·
陶瓷
·
纳米材料
·
热加工
✓ 已验证
DOI
高影响因子
SCRIPTA MATERIALIA
·
2014
·
IF 2.968
Ben Ma,Bo Chi,Jian Pu,Jian Li
The morphology of domain structure in LaNbO 4 added to YSZ–NiO composite was examined using a focused ion beam prepared specimen in a transmission electron microscope with a straining stage. It is confirmed for the first time that the morphology is changed under load through domain boundary movement. The driving force for this domain switch is the difference in Gibbs free energy between domains with different crystallographic orientations. This domain switch improves toughness by dissipating stress build-up at the crack tips.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Le Fu,Bohan Wang,Wei Xia
We have previously observed that doping of Ca ions was beneficial to the formation of zircon (ZrSiO 4 ). It is well known that synthetic ZrSiO 4 is typically formed via a solid-state reaction between ZrO 2 and SiO 2 , in which the interfaces between the reactant and resultant play an important role. However, the interfaces are lacking detailed microstructural observation. This follow-up study aims at exploring the formation mechanism of ZrSiO 4 by inspecting the interfaces at the nano and atomic scales with TEM techniques. Results demonstrated that ZrSiO 4 was formed in the Ca-doped sample after sintering at 1200 °C, whereas, no ZrSiO 4 was formed in the undoped sample even after sintering at 1230 °C. The Ca-doped sample consisted of a continuous ZrSiO 4 matrix with dispersed ZrO 2 nanocrystallites . Doping of Ca ions promoted the formation of ZrSiO 4 by causing lattice distortion and oxygen vacancies in ZrO 2 lattices. Thin amorphous grain boundary complexions were found between ZrO 2 nanocrystallites and between ZrO 2 and ZrSiO 4 crystallites . These amorphous complexions acted as reaction sites and an intermediate metastable state for the solid-state reaction. A detailed formation mechanism of ZrSiO 4 at the nanometer scale and atomic scale has been proposed.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 7
·4015-4022
·
IF 1.134
Wang Baomin,Deng Shuang,Zhao Lu
Graphene nanoplates (GNPs) are carbon nanomaterials with two-dimensional structure which is easy to reunite and their dispersion is necessary before using. The existing methods for dispersion characterization mainly include UV spectrophotometry, scanning electron microscope (SEM), transmission
electron microscopy (TEM) and Atomic Force Microscopy (AFM). In this research study, sodium dodecyl benzene sulfonate (SDBS), polyoxyethylene (40) nonylphenyl ether, branched (CO890), polyvinyl pyrrolidone (PVP) and cetyltrimethyl ammonium bromide (CTAB) were used as dispersants, and ultrasonic
treatment was employed as dispersion method. Ultraviolet spectrum for GNPs showed that some errors were attained, resulting from dispersant at 274 nm characteristic wavelength of GNPs dispersions with deionized water as controlled sample. The errors could be eliminated if dispersant solution
was used as controlled sample. The microstructures of dispersed GNPs observed by SEM, TEM and AFM suggested that the GNPs were dispersed uniformly with 2.5 g/L SDBS, which showed the best dispersion effect. Raman spectrum indicated that more chaotic distribution and edge structures were achieved
after dispersion.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Huafei Cai,Yonggang Jiang,Jian Feng,Qu Chen,Sizhao Zhang,Liangjun Li,Junzong Feng
Silica aerogel is a typical nanoporous material exhibiting excellent thermal insulation property, and its nanostructure change at high temperature has attracted extensive attention. However, there is a lack of real-time research on the nanostructure evolution of silica aerogel under rapid heating. Here, silica aerogel was rapidly heated and imaged via an in-situ heating TEM to characterize the nanostructure evolution of from 600 °C to 1300 °C. After rapid heating at different temperatures, the silica aerogels were characterized by SEM, BET, TG-DSC, XRD and FT-IR. The nanostructure evolution of the aerogels can be divided into three temperature stages and experimental strategies for inhibiting aerogel shrinkage at high temperature can be provided. In stage Ⅰ (600 °C–1000 °C), the shrinkage of the silica aerogels occurred during the initial time of the heating process (within 2 h), and then the structure of silica aerogel became stable. The shrinkage of silica aerogels is primarily caused by the fusion of secondary particles, and increasing the secondary silica aerogel particle size may contribute to reducing the aerogel shrinkage. In stage Ⅱ (1100 °C), the aerogel shrinkage can be observed all the time with the heating process continues, and finally closed to the dense state. The shrinkage of silica aerogels is caused by the fusion of secondary particles and the macropore collapse, increasing the particle size and reducing the macropore content may slow down aerogel shrinkage. In stage Ⅲ (1200 °C–1300 °C), the aerogel will shrink rapidly and reach a dense state in a very short time (within 0.5 h). The shrinkage of silica aerogels is caused by the rapid pore collapse and the rapid fusion and shrinkage of the secondary particles of the aerogel, and pure silica aerogels cannot be used at this temperature.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Wujian Zhang,Weijian Ge,Yiping Jin,Mingming Dang,Panpan Zhang,Wenfeng Han,Ying Li,Zongjian Liu,Haodong Tang
Loaded noble metal redispersion is an important way to solve catalyst sintering. However, how to redisperse at low temperatures or carbon-based noble catalysts is a difficult problem. In this paper, we report this phenomenon occurring on PdCu alloy catalysts, where small-sized PdCu alloys can be realized from sintered large-sized PdCu alloys on carbon supports in a CO/O 2 atmosphere. The mechanism of redispersion is elucidated by XPS, TEM and DFT calculations. The main reason for the redispersion is the formation of the PdCuOx intermediate, which can easily migrate to the nearby catalyst surface and then be reduced to smaller PdCu alloy nanoparticles. This work provides a deeper understanding of the redispersion phenomenon and provides certain applications in industry.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Shuxuan Luo,Yapeng Jia,Qiangqiang Zhou,Linyuan Ma,Huijun Ma,Le Yu,Wenyan Zhang
Silver nanowires (AgNWs) are promising materials for energy-related applications. Specifically, it shows excellent application value in flexible conductive materials, sensors, transparent electrodes, and photovoltaic solar cells; there is limited report on the study of the deep mechanism of the failure behavior during sintering of AgNWs. In this study, we investigated the diffusion melting process and interface dynamics occurring around the AgNWs with a diameter of 15–25 nm in the in situ transmission electron microscope. Through the evolution of the microstructure of silver nanowires during the heating process, first-principles density functional theory (DFT) calculations, and molecular dynamics (MD) simulations, we reveal the melting mechanism of silver nanowires with different crystallographic facets, which involves atomic diffusion, crystal plane reconstruction, and crystal plane growth. The results reported herein will help to better understand the dynamic processes in silver nanowire structures and enable the design of nanoelectronics devices to customize their physical properties.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
·
2025
·
IF 2.7
Maobin Xie,Dingshan Zhang,Jiayu Liu,Yao Jiang,Jin Bai,Hai Qiao
The aggregation of suspended particles caused by the coffee-ring effect (CRE) disrupts uniform distribution and limits accurate transmission electron microscopy (TEM) observation. Here, we show that glutaraldehyde (GA) suppresses CRE in aqueous polystyrene microsphere droplets and enables more uniform outer membrane vesicles (OMVs) deposition for TEM. Specifically, the addition of GA (0%–15% v/v) to 1% w/v, 1 µm red polystyrene microsphere suspensions progressively reduced ring formation: The ratio of maximum-to-minimum gray values decreased from 2.40 ± 0.22 (0% GA) to 1.11 ± 0.06 (15% GA), and mean CRE width dropped from ∼97 to ∼3.2 µm. Microsphere radial velocity decreased from 4.25 ± 0.37 (0% GA) to 0.89 ± 0.08 µm/s (15% GA), whereas bulk solution viscosity increased concomitantly (from ∼4 to ∼232 mPa s at 15% GA), indicating viscosity-mediated suppression of radial capillary flow. Addition of sodium dodecyl sulfate (SDS) partly restored CRE, consistent with reduction of surface-tension gradients that drive Marangoni reflux. Applying GA (6% v/v) to OMVs TEM preparation produced homogeneous OMVs counts across center, middle, and edge regions, without observable morphological alteration. We conclude that GA suppresses CRE primarily by (i) increasing viscosity to inhibit radial capillary flow and (ii) establishing surface-tension-driven Marangoni backflow that redistributes particles away from the contact line. GA thus provides a practical, fixation-compatible approach to improve TEM sample uniformity for biological nanoassemblies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Jian Dai,Gaohong He,Xuehua Ruan,Wenji Zheng,Yu Pan,Xiaoming Yan
A series of novel bis-imidazolium crosslinked polysulfone membranes (CL-PSf-ImOHs) membranes were prepared through simultaneous quaternization and crosslinking reactions of 4,4′-bis(2-methylimidazole-1-ylmethyl)diphenyl (bis-Im-diPh) and chloromethyl groups on the polymer during the membrane formation. The novel bis-Im-diPh crosslinker possesses a rigid bis-phenyl structure, which creates large free volume and leads to the formation of continuous hydroxide conducting channels in the membrane as demonstrated by TEM . The properties of the crosslinked membrane were controlled by varying the molar ratio ( R d/c ) of bis-Im-diPh and chloromethyl groups from 0.18 to 0.33. With increasing R d/c , the swelling ratio decreases, and the hydroxide conductivity increases. The CL-PSf-ImOH membrane with R d/c of 0.33 exhibits the conductivity of 112 mS cm −1 at 60 °C, much higher than that of non-crosslinked membrane (83 mS cm −1 , losing its morphology at 60 °C) and those of other crosslinked membranes (17–68 mS cm −1 ) prepared with the similar methods. In addition, the CL-PSf-ImOH membranes show good dimensional stability at elevated temperatures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Jun Cao,Qi Sun,Peng Wang,Jie Shen,Xue Dai
In order to solve the problem that separating zeolite 4A from solutions, we have synthesized Fe3O4/zeolite 4A magnetic nanocomposite by hydrothermal method. It is characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Vibrating Sample Magnetometer (VSM), scanning electron microscope (SEM) and Brunner-Emmet-teller (BET). The XRD result shows that Fe3O4/zeolite 4A magnetic nanocomposite has a good crystal structure. It also shows that Fe3O4/zeolite 4A magnetic nanocomposite contains two phases of zeolite 4A and Fe3O4 MNP. The optimal sample (Z-2) was judged by the calculation of crystallinity. The successful combination of zeolite 4A and Fe3O4 MNP was visually observed through SEM technology. The functional groups of Fe3O4/zeolite 4A magnetic nanocomposite were characterized by FTIR technology. The TEM result shows that some Fe3O4 MNPs enter zeolite 4A, which further clarifies the microstructure of Fe3O4/zeolite 4A magnetic nanocomposite. N2 adsorption-desorption technique confirms that Fe3O4/zeolite 4A magnetic nanocomposite SBET is 55.3374 m2/g and Dave is 9.7128 nm. VSM result shows that Fe3O4/zeolite 4A magnetic nanocomposite magnetization is 18.4534 emu/g. Simulation experiment shows that Fe3O4/zeolite 4A magnetic nanocomposite exhibit a fast response to an external magnetic field.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
磁性材料
✓ 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）