COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xiaoyu Zang,Zhengsong Qiu,Pengfei Guo,Hanyi Zhong,Xin Zhao,Tingbo Mu
Lost circulation is a critical technical challenge in the drilling and production process of underground oil and gas energy. In this study, a mechanically triggered release microcapsule for lost circulation control was designed and prepared with an in-situ polymerization using melamine, urea, formaldehyde, and diglycidyl ether of bisphenol A (healing agent) as raw materials. The structure and properties of the microcapsule were characterized by different techniques. The results show that the healing agent was successfully encapsulated by the resin shell, the median particle size (D50) of the microcapsules is 120.3 μm, and the thermal stability is excellent. The compatibility experiments show that the surface wettability and shear stability of the microcapsules are good in water-based drilling fluid. The compressive strength test reveals that the healing agent in the microcapsule is released and filled in the gap of the plugging zone under the contact pressure. The concentration of microcapsules and the size distribution of rigid particles are critical for the in-situ reinforcement effect. In addition, the fracture plugging performance of the microcapsule was studied. The results show that the pressure-bearing capacity of the plugging zone increases as the irregularity of the fracture surface increases. These findings indicate the microencapsulated healing agent is an effective lost circulation material (LCM), and provide a new technical idea for lost circulation control.
研究领域:
石油工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
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2025
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IF 16
Xuewen Jian,Yanhou Zhao,Beixing Li,Qiliang Huang,Muhammad Umair Sial,Zhe Sun,Da-xia Zhang,Nan Zou,Feng Liu
Existing polyurea membranes are continuous and dense. They are used to encapsulate pesticides to prevent the premature release of active ingredients. However, this also results in the inability of the active ingredients to be released on demand. We report a strategy in which amphiphilic molecules take turns “on duty”. First, micelles are used to transport water to form a microparticle layer, and then a thin dense coating is formed on its surface. Eventually, a bionic interfacial membrane with a structure similar to that of the leaf epidermis or animal skin is obtained. Experiments in conjunction with molecular simulations verified the underlying membrane formation mechanism. As a microcapsule shell for encapsulating pesticides, this bionic membrane can accurately respond to the digestive and crawling behaviors of pests, thus enabling the on-demand release of insecticides. Additionally, this membrane has the potential to be used in the preparation of flat membranes for sewage treatment.
研究领域:
农药化学
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胶体与界面科学
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药物递送系统
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仿生材料
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环境功能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Yue Wang,Weimin Tan,Xinliang Luo,Xingxing Rao,Yaxin Wang,Jinke Wang,W. Suphamitmongkol,Thee Chowwanonthapunya,Lingwei Ma,Dawei Zhang
Smart coatings with self-reporting and self-healing functions are essential to prolong their service life. In this work, a novel strategy was proposed to fabricate a dual-function coating with both mechanically triggered self-reporting ability and shape memory effect activated self-healing function. Polyurethane/poly-(urea-formaldehyde) microcapsules containing 2′,7′-dichlorofluorescein (DCF) were incorporated into the shape memory epoxy polymer (SMEP) coatings, and the molar ratios of curing agent and epoxy monomer were adjusted to modify the residual amino groups in the coating so as to strengthen both the self-reporting and self-healing performances. Once the coating was mechanically damaged, DCF would release from the ruptured DCF@PU/UF microcapsules and react with the residual amino groups in the coating to illustrate prominent red color. Even with a topcoat of polyurethane varnish or black paint, yellow fluorescence signals of DCF could be facilely observed upon ultraviolet light irradiation. For the self-healing performance, the high mobility of polymer networks endowed the coating with shape memory effect to recover the original shape and the barrier property. This strategy exhibits excellent potential to prolong the service lifetime of smart coatings.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Mi Xiao,Mengran Wu,Xiqing Xie,Huajun Feng,Yuxin Yang,Yingfeng Xu
The sun is regarded as an endless source of clean energy. However, the intermittent supply and dynamically changeable demand of solar energy, as well as its uneven regional distribution, have been continually motivating the technological research of practical strategies to realize the spatiotemporally separated solar energy harvest and utilization. Accordingly, we here developed an integrated system for efficient solar energy capture, stable storage, and on-demand release, which corresponds to the intricate design of three distinct modules, namely, a photothermal conversion module, a latent heat storage module, and a mechanical trigger module. Moreover, efficient heat transfer and long-term supercooled stability necessitate interfacial passivation to coordinate the physical coupling of different modules. In addition to providing an integrated prototype that demonstrates a closed energy cycle in practice, this study may further inspire a new paradigm for advanced solar utilization in both theory and methodology.
研究领域:
可再生能源
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能源存储
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热能工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT & CONCRETE COMPOSITES
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2021
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IF 7.586
Wenting Li,Qi Wei,Qing Chen,Zhengwu Jiang
Capsule-based self-healing of cementitious materials is a promising solution to improve the serviceability and to prolong the longevity of concrete structures. The successful use of mechanical triggering microcapsules to achieve cracks healing is still challenging and is closely dependent on the breakage of capsules upon crack formation . In this study, self-healing microcapsules were synthesized via complex coacervation using a styrene maleic anhydride (SMA) shell and an epoxy resin adhesive . The SMA/gelatin bi-layer wall formed with gelatin as the out layer for better trigger sensitivity under crack formation. The effects of various preparation parameters, referring to stirring rate, temperature, core-shell ratio and pH, have been investigated by characterizing the microcapsule morphology, shell thickness, size distribution, and chemical nature. The morphology demonstrates the encapsulation ability of SMA/gelatin and the spherical shape facilitates the rupture under crack formation. The elastic modulus and hardness of the microcapsules were determined using nano-indentation to assess the interfacial bonding and likelihood of mechanical triggering. Self-healing functionality of the developed microcapsules were validated in paste according to the in situ Acoustic Emission measurement.
研究领域:
材料科学
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土木工程
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化学工程
✓ 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）