POWDER TECHNOLOGY
·
2024
·
IF 4.5
Mianyan Yang,Zhijun Zhang,Na Wu
The effect of turbulence on the detachment between an air bubble and a glass bead (soda-lime) with different hydrophobicity was comprehensively researched. An experimental apparatus was designed to simulate the turbulent environment during the actual flotation process, which was used to research the detachment of different hydrophobic glass beads from bubble surfaces. It is indicated that three different hydrophobic glass beads detached from the bubble surfaces in the same way but at different speeds. The three-phase contact line (TPCL) shrank rapidly when the centrifugal detachment force of glass beads reached a critical value. The deformation of bubbles increased, and the three-phase contact (TPC) area continuously decreased. When the critical value was exceeded, the sliding and contraction speed around the TPCL further increased until a clear necking phenomena appeared near the TPC. Furthermore, the centrifugal detachment force, capillary force and total pressure force increased with increasing hydrophobicity in the detachment process.
研究领域:
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Mianyan Yang,Zhijun Zhang
The effect of surface roughness on the detachment between the bubbles and the glass beads (soda-lime) was comprehensively investigated. Glass beads with dimensions of −1.20 + 1.12 mm were acid etched to achieve varying degrees of surface roughness, followed by silanation reactions conducted for different immersion times. The characterization of surface roughness was conducted using a ContourGT-K 3D optical microscope. Measurements of receding contact angle, induction time and detachment force were conducted to assess the influence of surface roughness on bubble and glass bead attachment/detachment. It is observed that the etching surface of glass beads with uniform protrusions and depressions, the hydrophobic glass beads exhibited shorter induction time, larger contact angle and higher critical detachment force. However, the stability of aggregates of bubbles and hydrophilic glass beads was reduced, making them prone to detachment. Moreover, larger protrusions and depressions on hydrophobic glass bead surfaces with increasing etching time, resulted in an increase in induction time, a decrease in receding contact angle and critical detachment force. The stability of bubbles and hydrophilic glass bead aggregates remained unchanged.
研究领域:
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ming-Long Wang,Yi-Fei Sun,Hong-Nan Chen,Jin-Rong Zhong,Dan Rao,Yu Liu,De-Jun Xuan,Bei Liu,Chang-Yu Sun,Guang-Jin Chen
The CO 2 -H 2 O emulsion has multiple advantages in forming hydrate, such as easily adjustable CO 2 -to-H 2 O ratio, large contact area, strong sweep efficiency, and ability to carry chemical agents, which holds great promise for large-scale solid CO 2 geological sequestration. This paper systematically investigates the kinetics of hydrate formation from CO 2 -H 2 O emulsion and the corresponding morphological features in glass beads under different pore sizes at 3.27–7.15 °C and 10–14 MPa. Quantitative results on CO 2 hydrate formation rates, quantities, conversion rates, and hydrate saturations are obtained. Overall, under multi-factors, the conversion rates of CO 2 hydrate range from 22.9 % to 56.3 %, and hydrate saturations range from 18.5 % to 45.4 %. Here, lower temperature and higher pressure can enhance hydrate formation and increase the final conversion rate. As the pore size decreases, CO 2 hydrate conversion ratio increases, but the formation rate shows a significant decline. Additionally, under flowing conditions, hydrate conversion rates are further increased to 44.4 %–76.5 %, and its enhancement mechanism has been observed and revealed. Even though CO 2 droplets remain spatially separated, hydrate formation still demonstrates remarkably rapid propagation. These results prove the potential of CO 2 emulsion as an excellent medium for CO 2 hydrate storage and provide a direction for more effective carbon storage.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
C. Shen,Y.J. Wang,J.H. Xu,G.S. Luo
This paper presents a novel immobilization method for the preparation of highly dispersed TiO 2 nanoparticles supported on porous glass beads. The method involves an in situ ion exchange process and a calcination process. Mono-dispersed TiO 2 nanoparticles exhibiting the anatase phase with different mean diameter and different loading amount have been successfully prepared through the controllable and green way. With the increase of loading amount of Ti from 0.08 wt.% to 4.55 wt.%, the mean diameter of the TiO 2 nanoparticles varied from 3.8 to 5.3 nm. And the band gaps of the TiO 2 nanoparticles with the highest and lowest loading amount are 3.25 and 3.00 eV, respectively. The prepared TiO 2 nanoparticles supported on porous glass beads showed excellent photocatalytic performance for the degradation of methyl orange (MO). For the catalyst with a Ti content of 0.08 wt.%, when the dosage was 1.93e−5 g/mL, 65% of the total MO decomposed after 30 min; for the catalyst with a Ti content of 2.56 wt.%, when the dosage reached 0.81e−3 g/mL, complete degradation was observed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Mianyan Yang,Zhijun Zhang
The critical flow velocity required to detach glass beads (soda-lime) of different hydrophobicity from bubbles was investigated. Using a home-made turbulence controlling system to observe the centrifugal motion of glass beads. The results indicated that different flow velocities were achieved by controlling the rotational speed. Different flow velocity indirectly affected the centrifugal acceleration when the centrifugal detachment of glass beads occurred. When the flow velocity exceeded the critical value, the different hydrophobic glass beads and bubble aggregates experienced centrifugal detachment force also reached the critical value. Due to the pinning effect, the more hydrophobic the glass beads attached to the bubbles, the more stable the aggregates formed. It was necessary to increase the flow velocity to enhance the centrifugal detachment force. The three-phase contact line (TPCL) between glass beads and bubbles rapidly slipped and contracted when attachment force was less than detachment force in centrifugal motion. Resulting in a noticeable necking phenomenon that completed the detachment. Meanwhile, the detachment behavior between glass beads and bubbles did not occur at specific locations, but rather randomly. It was depended on the size and strength of the vortex at that location, as well as the stability of attachment between bubbles and various glass beads.
研究领域:
流体力学
·
界面科学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2019
·
IF 3.031
Suqi Zhang,Jie Zhang,Jian Sun,Zhiyong Tang
A novel capillary microphotoreactor (MPR) packed with TiO 2 -coated glass beads was developed in this work and its photocatalytic performance was evaluated using degradation of methylene blue (MB) as a model reaction. As compared to conventional wall-coated MPR, the use of glass beads as packing material not only provides a larger surface area for catalyst immobilization and shortens the mass transfer route, but also introduces flow perturbation. An appropriate size of glass beads should be chosen for packing because there is a tradeoff between increased catalysts coating area and decreased light penetration. It was found out that nearly 100 % degradation efficiency could be achieved in 80# glass beads packed MPR within short residence time (20 s), which was more than 2 orders of magnitude larger than value obtained in wall-coated MPR under the same operational conditions. Moreover, the packed MPR showed good durability, which declined by about 17 % after 6 h of operation and then remained stable for next 19.5 h.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 5
·1219-1229
·
IF 5.2
Li Sun,Feiyang Ma,Yuejin Shan,Yuan Zhi,Mengying Sun,Binlin Dou
A tandem reactor module using Au nanoparticle (NP)-coated glass beads as packing materials is designed and fabricated for the catalytic reduction of 4-NP. Au NP-coated glass beads are first prepared by means of airpotato yam rhizome extract. Here, Au NPs are uniformly distributed on the glass bead surface and show good purity, high crystallinity, and small size. Furthermore, the tandem reactor module is assembled by connecting eight packed reactors in series. Based on the tandem reactor module, the 4-NP removal rate can reach up to 72.9 μmol h−1 and the rate constant is determined as 1.5 × 10−2 s−1. Meanwhile, the tandem reactor module can continuously and stably perform for 24 h and displays satisfactory reusability over 6 months. In addition, the number of packed reactors in the module can also be preset according to the practical 4-NP removal. Considering its superior performance, the tandem reactor module can have considerable potential in the field of environmental governance.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Liang Zhao,Yunlong Yang,Jiangtao Yuan,Jifu Feng
Surface roughness plays a pivotal role in bubble-particle interactions and flotation characteristics. In this study, the effect of surface roughness on the flotation performance of coarse particles has been fundamentally investigated. Surface roughness of coarse glass beads (with a median diameter of 429.91 μm) with varying etching times was characterized by a 3D optical microscope. The micro-flotation results showed that surface roughness can improve the flotation recovery of coarse particles. The fundamentals of surface roughness in assisting coarse particle flotation were investigated in terms of contact angle, bubble-particle attachment and detachment. It was found that surface roughness increases the particle hydrophobicity due to the Cassie-Baxter state on rough surfaces. The induction time decreased with increasing surface roughness, indicating that less time is required for the attachment between a bubble and a rough particle. Surface roughness facilitates the bubble-particle attachment. The measurements of attachment tenacity and detachment probability indicated that the stability of bubble-particle aggregates improves as surface roughness increases. Surface roughness helps prevent the bubble-particle detachment. Ultimately, the combination of increased bubble-particle attachment and reduced bubble-particle detachment improves the flotation recovery of coarse particles.
研究领域:
矿物加工
·
表面化学
·
颗粒技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Sustainable Systems
·
2025
·
IF 6.1
Zhuhan Xu,Long Li,Mengting Ye,Zhaojun Dong,Luyao Huang,Zhan Liu,Jun Li
Flame retardant properties are critical for the use of foams in packaging and transportation applications. However, the process of preparing conventional flame retardant foams is complex and adversely affects their thermal insulation and mechanicl properties. Here, a convenient and scalable synergistic strategy is reported to prepare synergistic flame-retardant, heat-insulating cellulose-based foams with stabilized laminar structures through a one-step physical blending of ammonium polyphosphate (APP) and vacuum glass microspheres (HGMs), which exhibit lightweight (72.18 mg cm −3 ), enhanced flame retardant properties (pHHR reduced from 109.6 to 67.3 kW m −2 ), excellent barrier effect (E Barrier increased by 45.82%), excellent thermal conductivity (with a thermal conductivity of 59.9 mW mK −1 ) and good mechanical properties (stress of 57.53 kPa at 80% strain). In addition, the foam can be recycled by easy methods. Therefore, the present work provides a feasible approach for flame retardant and heat-insulating bio-based foams and has a wide range of applications in packaging and construction materials.
✓ 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）