JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Chenwei Zou,Caili Dai,Yifei Liu,Qing You,Fei Ding,Yongping Huang,Ning Sun
In recent years, the liquid temporary plugging agent has drawn extensive attention, especially in the repeated fracturing operation for stimulating unconventional oil and gas reservoir production. This paper developed a novel self-degradable gel (SDG) as a liquid temporary plugging agent for high-temperature reservoirs. The gelation process, viscoelasticity, pressure-bearing capacity, self-degradation, and formation protection performance of the SDG were systematically investigated. Moreover, the gelation and self-degradation mechanism of the SDG were revealed by studying the viscosity variation and the microstructures. Considering the gelation time and gel strength, the composition of the SDG was optimized as 6.0–10.0 wt% monomer, 0.004–0.012 wt% initiator, and 0.2–0.4 wt% crosslinker. The SDG transformed from liquid to solid-like gel within 30 to 90 min at 90–130 °C. The rheological results showed that the duration of the low viscosity state exceeded 75 % of the total gelation process at high temperatures, which was conducive to the injection of the SDG. In addition, the viscosity of the SDG after gelation was more than 100 Pa·s, which ensured its effective plugging in fractures. The experimental results with fractured cores showed that the bearing pressure of the SDG remained above 30 MPa/m in fracture with a width of 2.05–5.04 mm, which could meet the requirements of the repeated fracturing operation. Moreover, the SDG could spontaneously degrade from solid-like gel to liquid with a viscosity of lower than 10 mPa·s in 10–105 h at 90–130 °C. The broken-gel liquid could be completely displaced out of the fractured core, and the core damage rate was less than 5.0 %, which ensured the restoration of conductivity of the previously existing fractures. Micrographs showed that the dense three-dimensional network structure with high viscosity was formed by polymerization and crosslinking. Then, the acrylic acids in the polymer chain were broken at high temperatures, resulting in the gradual destruction of the gel and the spontaneous degradation of SDG.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 6
·2415-2423
·
IF 5.3
Zhong Yunjin,Zhang Bingying,Zhu Zhexin,Wang Gangqiang,Mei Xueting,Fang Yu,Lu Wangyang
Plastic wastes threaten the environment security. Degradable materials were considered as the most promising way to solve the problem of plastic pollution. In this work, the cationic dyeable polyester modified with photocatalyst g-C 3 N 4 /TiO 2 was synthesized by centrifugal electrospinning, which had a photodegradable function under solar illumination. The result indicated that cationic dyeable polyester modified with 5% g-C 3 N 4 /TiO 2 composite had excellent self-degradation ability in water environment under solar illumination. After 400 h illumination, the polyester matrix could be almost completely degraded. In addition, degradation products and degradation pathway were analyzed by ultra-high-performance liquid chromatography-mass spectrometry. The chain scission of polyester macromolecule led to the generation of formic acid, sodium sulfate, and short chain substances, and then they were degraded into CO 2 and H 2 O. The degradation of the macromolecular chain was from large to small, from small to without. The design of the degradable polyester material was conducive to reducing the generation of polyester micro plastic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS OF FLUIDS
·
2023
·Vol. 35
·期 8
·
IF 4.6
Yang Hongbin,Lv Zhiqi,Li Zhe,Guo Bumin,Zhao Jian,Xu Yantao,Xu Wenjiang,Kang Wanli
In order to solve the uncontrollable swelling ratio and degradation time and insufficient strength of conventional self-degradable temporary plugging agent (CSD-TPA), a controllable self-degradable temporary plugging agent (SD-TPA) was proposed. A series of SD-TPA were prepared with free radical polymerization, and the SD-TPA was synthesized by different mass ratios of acrylamide, acrylic acid, hydrophobic monomer, and modified nanoparticles. The effects of modified nanoparticles content, hydrophobic monomers content, temperature, and salinity on its swelling performance, self-degradable performance, and rheological properties were researched systematically. The plugging and unblocking performance of SD-TPA were studied by a core displacement test. The experimental results showed that SD-TPA can be gelatinization after 4 h at 40 °C. Under the formation condition, SD-TPA had better viscoelasticity, shear resistance, and higher yield stress than CSD-TPA. The core plugging rate increased from 86.44% to 91.41%, and the formation damage rate decreased to 14.11%. This work provides a new temporary plugging material during hydraulic fracturing process and the swelling ratio, degradation time, and insufficient strength of SD-TPA can be adjusted according to the requirement of fracturing.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 10
·615
·
IF 5
Fan Yang,Fan Li,Renjing Ji,Xiaorong Yu,Huan Yang,Gaoshen Su
A self-degradable rubber plug (SDRP) was developed to address issues in existing crosslinked polymer temporary plugging technology, such as poor self-degradation properties. The synthesis formula was optimized using response surface analysis, resulting in an optimized composition of the SDRP: 13 wt% monomer, 0.02 wt% initiator, 0.7 wt% crosslinker, and 1.8 wt% degradation catalyst. Under the condition of 70–120 °C, the SDRP was transformed from a liquid to a solid gel in 30–110 min; the degradation time was 3–10 days, and the viscosity of the completely degraded solution was lower than 20 mPa·s. At an injection volume of 1 PV SDPR, a breakthrough pressure of 8.34 MPa was achieved. The hydrolysis of the unstable crosslinker was found to have caused the breakage of the SDRP. Over time, the functional groups within the unstable crosslinker underwent hydrolysis due to the combined effects of temperature and the degradation catalyst. This process led to the disruption of crosslinking points, resulting in a gradual deterioration of the network structure. As a consequence, some immobile water was converted into free water. The mobility of water molecules increased until the plug was completely degraded into a viscous liquid. This study enriches the temporary plugging gel system.
研究领域:
材料科学
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石油工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Bioengineering-Basel
·
2022
·Vol. 9
·期 7
·307
·
IF 5.046
Zhixian Huang,Fan Zhang,Yanbo Tang,Yongdi Wen,Zhenqiang Wu,Zhen Fang,Xiaofei Tian
Hypocrellins (HYPs) are natural perylene quinone derivatives from Ascomycota fungi. Based on the excellent photosensitization properties of HYPs, this work proposed a photocatalytic advanced oxidation process (PAOP) that uses HYPs to degrade rhodamine B (RhB) as a model organic pollutant. A synergistic activity of HYPs and H2O2(0.18 mM of HYPs, 0.33%w/vof H2O2) was suggested, resulting in a yield of 82.4% for RhB degradation after 60 min under visible light irradiation at 470–475 nm. The principle of pseudo-first-order kinetics was used to describe the decomposition reaction with a calculated constant (k) of 0.02899 min−1(R2= 0.983). Light-induced self-degradation of HYPs could be activated under alkaline (pH > 7) conditions, promising HYPs as an advanced property to alleviate the current dilemma of secondary pollution by synthetic photocatalysts in the remediation of emerging organic pollutants.Keywords:photocatalytic advanced oxidation;organic pollutants;photosensitizer;ring-opening reaction;self-degradation
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Dong Xu,Ao Chen,Quankang Sheng,Guang Hu,Long Chen,Yu Zhang,Shaoyun Chen,Chenglong Hu
It is found that methyl orange can be effectively self-assembled into the aggregation of rigid rod to form rectangular template for the growth of PANI and then an uncomplicated one-step self-degraded template method has been used to prepare uniform crystalline tetragonal hollow polyaniline (PANI) nanotubes. The inner and outer surfaces of PANI nanotubes are completely exposed to the electrolytes due to the large inner diameter of PANI nanotubes, which can enhance the utilization efficiency of the electrode materials, resulting in a high specific capacitance up to 590 ± 36 F/g at a scan rate of 5 mV/s. Furthermore, the enhanced specific capacitance and rate capability can be explained by the nearest neighbor regular folded-chain model. The symmetric all-solid-state flexible supercapacitor device is also assembled by PANI nanotubes electrodes to form the sandwich structure, and the maximum energy density is 14.56 Wh/kg at a power density of 250 W/kg. Considering the low cost and convenient preparation of PANI, the tetragonal hollow PANI nanotubes are expected to play an important role in the application of supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Haiwang Wang,Li Chao,Xinfang Wei,Jinlong Li,Cheng Ji,Bingzhu Wang,Xiwei Qi,Pengcheng Hu,Yifan Ying,Mengping Tian
Nowadays, the polymer flocculation technology has been widely used in the treatment of oil sand tailings pollutants. However, the most commonly used polyacrylamide flocculant has encountered some problems, such as low flocculation efficiency and severe secondary pollution. In this paper, an organic-inorganic composite high-efficiency flocculant with self-degradation was designed and prepared. Furthermore, in order to analyze the synthesis mechanism of the composite material, the functional groups of the material were investigated by Fourier transform infrared spectroscopy (FTIR). At the same time, the morphology and structure were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Meanwhile, the crystal structure was recorded by XRD . In addition, the flocculation efficiency of the composite flocculant was determined by measuring the turbidity removal of the kaolin suspension. Apart from this, the flocculation parameters were optimized by central composite design (CCD) experimental design and response surface methodology (RSM). Finally, the self-degrading property of the flocculant was tested under light conditions. The characterization data of the material indicated that the synthesis mechanism is that under the ultraviolet light condition, the acrylamide monomer undergoes free radical polymerization under the action of active free radicals on the surface of the core-shell structure SiO 2 -TiO 2 to form an organic-inorganic composite flocculant. In addition, the optimized experimental results showed that the optimal turbidity removal conditions were followed: V TBOT /m SiO2 of 6.66 mL/g, flocculant dosage of 50 ppm and kaolin suspension concentration of 1.5 wt%. Ultimately, the degradation experiment showed that the prepared organic-inorganic composite flocculant has nice self-degradation performance, and the self-degradation efficiency reaches over 90% within two hours. In summary, this work has greatly enriched the knowledge of oil sand tailings treatment.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2023
·
IF 15.1
Ximin Yuan,Zhou Zhu,Pengcheng Xia,Zhenjia Wang,Xiao Zhao,Xiao Jiang,Tianming Wang,Qing Gao,Jie Xu,Debin Shan,Bin Guo,Qingqiang Yao,Yong He
Tough hydrogel has attracted considerable interest in various fields, however, due to poor biocompatibility, nondegradation, and pronounced compositional differences from natural tissues, it is difficult to be used for tissue regeneration. Here, a gelatin-based tough hydrogel (GBTH) is proposed to fill this gap. Inspired by human exercise to improve muscle strength, the synergistic effect is utilized to generate highly functional crystalline domains for resisting crack propagation. The GBTH exhibits excellent tensile strength of 6.67 MPa (145-fold that after untreated gelation). Furthermore, it is directly sutured to a ruptured tendon of adult rabbits due to its pronounced toughness and biocompatibility, self-degradability in vivo, and similarity to natural tissue components. Ruptured tendons can compensate for mechanotransduction by GBTH and stimulate tendon differentiation to quickly return to the initial state, that is, within eight weeks. This strategy provides a new avenue for preparation of highly biocompatible tough hydrogel for tissue regeneration.
研究领域:
生物材料
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组织工程
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Yang Kuan,Wei Wei,Gao Li Ting,Zhao Xin Yi,Liu Zhenqi,Li Jianhui,Li Haopeng,Miyatake Hideyuki,Ito Yoshihiro,Chen Yong Mei
The proper microenvironment is critical for the storage and transportation of embryonic stem cells (ESCs). To mimic a dynamic 3D microenvironment as it exists in vivo and consider “off-the-shelf” availability reaching the destination, we proposed an alternative approach that allows for facile storage and transportation of stem cells in the form of ESCs-dynamic hydrogel construct (CDHC) under ambient conditions. To form CDHC, mouse embryonic stem cells (mESCs) were in-situ encapsulated within a polysaccharide-based dynamic and self-biodegradable hydrogel. After storing CDHC in a sterile and hermetic environment for 3 days and then transferring to a sealed vessel with fresh medium for another 3 days, the large and compact colonies retained a 90% survival rate and pluripotency. Furthermore, after transporting and arriving at the destination, the encapsulated stem cell could be automatically released from the self-biodegradable hydrogel. After continuous cultivation of 15 generations of retrieved cells, automatically released from the CDHC, the mESCs underwent 3D encapsulation, storage, transportation, release, and continuous long-term subculture; resumed colony forming capacity and pluripotency were revealed by stem cell markers both in protein and mRNA levels. We believe that the dynamic and self-biodegradable hydrogel provides a simple, cost-effective, and valuable tool for storing and transporting “ready-to-use” CDHC under ambient conditions, facilitating “off-the-shelf” availability and widespread applications.
研究领域:
生物材料
·
干细胞生物学
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组织工程
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Chen Liang,Ang Chu,Zhe Lu,Shiwei Feng,Fukang Liu,Jingjing Cui,Yunlong Guo,Weizi Gao,Biao Zhang
Photocuring-based three-dimensional (3D) printed hydrogels have versatile applications in various fields. However, the heterogeneous network with nanogel cross-linking points during free radical polymerization (FRP) often results in hydrogels that are unable to degrade or be reprocessed, significantly limiting their applications. Herein, a UV-curable reversible addition–fragmentation chain transfer (RAFT)-mediated hydrogel system compatible with digital light processing (DLP) 3D printing is reported, enabling the fabrication of complex hydrogel structures with rapid, controlled degradation and self-degradation capabilities at ambient temperature. The enhanced degradability stems from the synergistic combination of the hydrolyzable bonds and RAFT chemistry. The hydrogel precursors exhibit optimal rheological properties, while the mechanical properties of the resulting hydrogels are precisely tunable by adjusting the cross-linker content and water content. Degradation kinetics can be systematically controlled by adjusting the cross-linker content, water content, and the treatment temperature. Hydrogels containing 50 wt % water content demonstrate complete degradation into molecular chain segments and/or molecules within 6 h at 37 °C. Furthermore, the 3D printed RAFT-mediated hydrogels can self-degrade at ambient temperature. After self-degradation, the resulting solution exhibits the unsaturated acrylic functional molecules with the characteristic of high viscosity, which can be directly used for UV-assisted direct ink writing (DIW) to refabricate new 3D hydrogel structures.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
·
增材制造
·
大分子化学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 8
·2453
·
IF 2.8
Bo Wang,Zhanqi He,Jin Lin,Kang Ren,Zhengyang Zhao,Kaihe Lv,Yiting Liu,Jiafeng Jin
Deep coalbed methane (CBM) reservoirs are characterized by high hydrocarbon content and are considered an important strategic resource. Due to their inherently low permeability and porosity, horizontal well drilling is commonly employed to enhance production, with the length of the horizontal section playing a critical role in determining CBM output. However, during extended horizontal drilling, wellbore instability frequently occurs as a result of drilling fluid invasion into the coal formation, posing significant safety challenges. This instability is primarily caused by the physical intrusion of drilling fluids and their interactions with the coal seam, which alter the mechanical integrity of the formation. To address these challenges, interpenetrating and semi-interpenetrating network (IPN/s-IPN) hydrogels have gained attention due to their superior physicochemical properties. This material offers enhanced sealing and support performance across fracture widths ranging from micrometers to millimeters, making it especially suited for plugging applications in deep CBM reservoirs. A self-degradable interpenetrating double-network hydrogel particle plugging agent (SSG) was developed in this study, using polyacrylamide (PAM) as the primary network and an ionic polymer as the secondary network. The SSG demonstrated excellent thermal stability, remaining intact for at least 40 h in simulated formation water at 120 °C with a degradation rate as high as 90.8%, thereby minimizing potential damage to the reservoir. After thermal aging at 120 °C, the SSG maintained strong plugging performance and favorable viscoelastic properties. A drilling fluid containing 2% SSG achieved an invasion depth of only 2.85 cm in an 80–100 mesh sand bed. The linear viscoelastic region (LVR) ranged from 0.1% to 0.98%, and the elastic modulus reached 2100 Pa, indicating robust mechanical support and deformation resistance.
研究领域:
石油工程
·
高分子科学
·
能源资源
·
钻井技术
·
储层保护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2022
·
IF 11.467
Hong Liu,Zhitao Hu,Haolin Chen,Yanzi Yan,Zhicheng Le,Cong Wei,Wenqiang Cao,Tianfeng Chen,Yongming Chen,Lixin Liu
Vaccination with subunit nanovaccines is a promising strategy to combat virus infection and tumor development. However, immunogenicity of present nanovaccines is still unsatisfied for clinical translation. Here, we developed a nanovaccine loading a STING agonist, 2′3′-cGAMP and, a model subunit antigen, OVA , by using a well-defined self-degradable poly(β-amino ester)s to treat B16F10-OVA melanoma tumors. The polymer underwent slow hydrolysis at pH 5.5 but self-degraded induced by the amino groups along the polyester chain at pH > 6.5. It is shown that the self-degradation products facilitated the release of 2′3′-cGAMP and OVA from early endolysome to the cytosol, where the two components strongly activated CD8 + T lymphocytes (CTLs) and significantly enhanced Ifn1, TNF , Cxcl9, and Cxcl10 expression. In turn, the tumor microenvironment was remolded from cold to hot. Moreover, the nanovaccine could be quickly drained to sentinel lymph nodes after intratumoral injection. The nanovaccine with strong immunogenicity also could reduce the side effects of systemic inflammatory reaction caused by molecular 2′3′-cGAMP. The tumor progression of animals was inhibited, and their survival rates increased significantly. Thus, the multifunctional biodegradable material provided a new delivery system for a cancer vaccine to translate to clinics.
研究领域:
癌症研究
·
免疫学
·
生物医学工程
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）