Polymers
·
2024
·Vol. 16
·期 12
·1614
·
IF 4.7
Daqi Li,Shuyang Gao,Zhichuan Tang,Huimei Wu,Yayun Zhang
The development of micro cracks in shale formations can easily lead to wellbore instability caused by liquid phase invasion. In order to effectively seal the shale micropores, the surface treatment of nano-SiO2particles was developed using the silicane coupling agent A-1891. Then, the temperature-sensitive polypenic acrylamide polymer was modified onto the surface of the nanoprocal particle through reaction to obtain the nanosomal blocking agent ASN. The infrared spectrum shows that there are chemical bonds between the generated polymer chains, rather than simple physical composites, indicating the successful synthesis of the temperature-responsive nanosealing agent ASN. The particle size analysis showed that the synthesized nanoparticles in ASN have a uniform particle size distribution and display no agglomeration phenomenon. Applying ASN as a sealing agent in drilling fluid effectively fills the nanoscale micropores and microcracks in shale, making shale denser and significantly improving the wellbore stability of shale formations. In addition, it has good temperature resistance, can adapt to reservoirs at different temperatures, is non-toxic and environmentally friendly, and has good prospects for stable applications in shale formation wellbore.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 13
·7165-7175
·
IF 3.049
Fan Li,Yuyou Yang,Mingjiang Tao,Xiangqian Li
Although hydrophobic surface coating of concrete is currently used to enhance waterproofing performance of underground structures, the chemical and mechanical incompatibility between an inorganic cement and organic coating makes it a challenge to ensure long-term waterproofing properties of underground facilities, especially for tunnel lining systems. This study explores the feasibility of using a silane coupling agent to improve compatibility between the cement and tail sealant interface, which aims to reduce the water leakage risk of lining systems. The enhanced waterproofing performance of the cement–tail sealant interface modified with the silane agent was confirmed by its hydrophobicity (i.e. reduced wetting ability) and reduced permeability, which was evaluated by static water-contact angle and impermeability pressure measurements. The processes underlying the enhanced waterproofing performance of the cement–tail sealant interface were revealed by chemical bonding, microstructure and porosity characterization. Fourier transform infrared spectroscopy (FTIR) results of the cement–tail sealant interface confirm the reactions between the silane agent and cement hydration products, while both microstructure and porosity results reveal that the cement–tail sealant interface is denser and less porous, relative to the control cement grout.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 42
·6488-6499
·
IF 5.047
Shaoquan Bian,Zhiqiang Zheng,Yuan Liu,Changshun Ruan,Haobo Pan,Xiaoli Zhao
Surgical sealants suitable for wounds with non-flat complex geometries are still a challenge to fulfill clinical requirements. Herein, a novel fit-to-shape sealant enhanced by photo-initiated crosslinking was developed utilizing maleic anhydride modified chitosan (MCS), benzaldehyde-terminated PEG (PEGDF) and polyethylene glycol diacrylate (PEGDA). Initially, the shear-thinning hydrogel prepared through the Schiff-base linkage between MCS and PEGDF could be injected into target sites, remolded to conform to a wound with non-flat complex geometry, and remain on the wound, avoiding adverse liquid leakage. Under illumination with ultra-violet (UV) light, the hydrogel was solidified in situ rapidly to adopt the wound contour and enhanced in adhesive strength to seal defects of the tissue. In addition, the hydrogel exhibits stability in extreme pH environments (pH = 1) and has potential to treat wounds inside the stomach with the existence of gastric acid. Moreover, the hydrogel can be applied as adhesive wound dressings through in situ 3D printing. Taken together, the fit-to-shape sealant enhanced by photo-initiated crosslinking can be considered as promising tissue adhesives for wound closure and other biomedical applications.
研究领域:
生物材料学
·
医学工程
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Guangyu Wang,Zehua Zhou,Qinghan Hu,Xiangru Shi,Xin Zhang,Kaicheng Zhang,Lintao Wu
Sealing treatment is an effective method to prolong the service life of Fe-based amorphous coatings for steel substrates. Common sealants always have the disadvantages of releasing amounts of volatile organic compounds (VOC) and are expensive, prompting researchers to develop an eco-friendly, low cost and high-performance sealant. However, their simultaneous improvement is restricted by some inevitable contradictions among them. Herein, natural rosin was introduced as a sealing material and an eco-friendly natural rosin-based SiO 2 –NH 2 @GO hybrid sealant was successfully prepared by the sol-gel method. In addition, the functional nanocomposite SiO 2 –NH 2 @GO was added to the hybrid sealant system to achieve the purpose of extending the service life of the sealant. The filling efficiency, adhesion, thermal stability and long-term corrosion resistance of hybrid sealants were investigated. The study showed that the adhesion of the hybrid sealant to the Fe-based amorphous coating was improved by 10.59% after adding the nanocomposite. The hybrid sealant reaches maximum thermal decomposition at 414.3 °C. The corrosion current density ( i corr ) of the sample NSG-0.5‰ still decreased by about two orders of magnitude after immersion for 672 h (0#, i corr = 1.39 × 10 −4 A/cm 2 ; NSG-0.5‰, i corr = 1.51 × 10 −6 A/cm 2 ). Full immersion experiments explore the failure process of hybrid sealants, where corrosion always tends to propagate with unmelted particles. The hybrid sealant prepared has the advantages of being eco-friendly and low cost, and provides a specific preparation process, which provides a new direction for the development of the sealant.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lei Chen,Chun Li,Xiaoqing Si,Xiaoyang Wang,Zhiquan Wang,Jian Cao
Based on reactive air brazing (RAB), we designed a new type of sealant (Ag–xCuAlO 2 ) for joining 3 mol.% yttria-stabilized zirconia (YSZ) ceramics and AISI 310S stainless steel. The CuAlO 2 content affected the wettability of the sealant on the YSZ surface, and the joints had a high shear strength when Ag–2 wt.%CuAlO 2 , which had a small contact angle on the YSZ substrate, was used as the sealant. In addition, the thickness of the oxide layer was reduced compared to that for the Ag–CuO sealant. The effects of the processing parameters on the microstructure and shear strength of the joints were investigated, and the as-brazed joints reached their highest shear strength (93.7 MPa) when brazed at 1040 °C for 30 min. After high-temperature oxidation at 800 °C for 200 h, the shear strength of the joints remained at 50 MPa, and no apparent change in the microstructure was observed, proving that the joints possessed excellent oxidation resistance .
研究领域:
材料科学
·
焊接技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2021
·Vol. 31
·期 1
·269-281
·
IF 2.757
Van Nguyen Tuan,Nguyen Tuan Anh,Pham Ha Thi,Pham Ly Thi,Nguyen Phuong Thi,Dao Thuy Bich,Van Trinh Trung,Vu Duong,Le Quy Thu
A typical structure of thermal spray coatings consisted of molten particles, semi-molten particles, oxides, pores, and cracks. These factors caused the porosity of sprayed coatings, leading to a significant influence on the coating properties, especially their wear-corrosion resistance. In this study, a post-spray sealing treatment of Cr 3 C 2 -NiCr/Al 2 O 3 -TiO 2 plasma-sprayed coatings was carried out, and then, their corrosion properties were evaluated, before and after the treatment. For the sealing process, aluminum phosphate (APP) containing Al 2 O 3 nanoparticles (~10 nm) was used. The permeability of APP into the sprayed coating was analyzed by SEM-EDS. The treatment efficiency for porosity and corrosion resistance of sprayed coatings was evaluated by electrochemical measurements, such as the potentiodynamic polarization and electrochemical impedance spectroscopy. The wear-corrosion resistance of the coating was examined in 3.5 wt.% NaCl circulation solution containing 0.25% SiO 2 particles. The sealing efficiency was evaluated by the percentage of the treated open pores in the coating. The obtained results showed that APP penetrated deeply through the coating and the incorporation of Al 2 O 3 nanoparticles into APP sealant improved the sealing efficiency by 20% of open pores in comparison with the sealant without nano-Al 2 O 3 . The effect of the post-treatment on corrosion protection of the sprayed coating has been discussed.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Xiaoyong Tan,Jiupeng Zhang,Dong Guo,Guoqing Sun,Yingying Zhou,Wenwu Zhang,Yongsheng Guan
In order to improve the repeated repair ability of asphalt-based crack sealants, two types of microcapsules were prepared and added into asphalt-based crack sealant. The epoxy resin and curing agent were microencapsulated by using interfacial polymerization method, and named as A-type and B-type microcapsules respectively. The effects of emulsifier content and core-wall ratio on the preparation of two types of microcapsules were analyzed, and SEM, FT-IR, TG-DSC, and FOM analyses were performed to study the microscopic features of microcapsules, including the particle size and size distribution, chemical components, morphological features, thermal stability as well as the dispersion of microcapsules in the sealant. Then, DSR tests were conducted with two-stage loading mode to evaluate the repeated repair ability of asphalt-based crack sealants with different dosages of microencapsulated epoxy resin and curing agent. The results show that the optimal emulsifier contents are 0.5% and 0.7% for the A-type and B-type microcapsules respectively, and the corresponding core-wall ratios are 1.3:1 and 1.1:1 respectively. The two types of microcapsules were successfully prepared with well-distributed particle sizes and sufficient thermal stability, which are be well dispersed in asphalt-based sealants. The repeated repair ability indexes were proposed based on DSR complex shear modulus and the corresponding loadings cycles. It is found that the repeated repair ability of composited sealants is obviously improved. The optimal dosage of two types of microcapsules are 3%, and a sufficient healing time is required for repairing crack due to the indispensable curing process of epoxy.
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
ACS Omega
·
2023
·
IF 4.1
Huimei Wu,Yishan Lou,Xiaopeng Zhai,Zhonghui Li,Bin Liu
In this study, we present an innovative intelligent polymer sealant designed to mitigate CO2 leakage during underground geological storage (CCUS). This sealant is formulated by cross-linking CO2-responsive polymers, specifically acrylamide (AM) and N-[3-(dimethylamino) propyl] methacrylamide (DMAPMA), with polyethylenimine (PEI) serving as the cross-linking agent. The polymer sealant’s characteristics were systematically investigated, varying the CO2-responsive polymer content (1.5 wt %) and PEI content (0.1–0.6 wt %). A comprehensive analysis encompassing the rheological properties, thermal behavior, conductivity, and microstructures was conducted. Experimental results indicate that the polymer sealant exhibits excellent injectability, rapid response kinetics, thermal stability, and robust mechanical strength. Upon encountering CO2, the polymer system undergoes a transition from sol to gel state, forming a surface-smooth, uniformly porous three-dimensional (3D) network skeleton structure. Remarkably, the gel’s modulus remains relatively unaffected by the shear frequency. Core fluid displacement experiments demonstrated a substantial sealing efficiency of 73.6% for CO2 and an impressive subsequent injection water sealing rate of 96.2%, underscoring its superior sealing and migration performance. In conclusion, the proposed CO2-responsive gel sealant exhibits an exceptional potential for successful utilization in CCUS operations. This advancement introduces a novel avenue to enhance the effectiveness of CO2-responsive gel sealants, thereby contributing to the advancement of CO2 leakage mitigation strategies in geological storage scenarios.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 14
·2007457
·
IF 18.808
Lei Zhou,Cong Dai,Lei Fan,Yuhe Jiang,Can Liu,Zhengnan Zhou,Pengfei Guan,Yu Tian,Jun Xing,Xiaojun Li,Yian Luo,Peng Yu,Chengyun Ning,Guoxin Tan
Biocompatible hydrogel adhesives with multifunctional properties, including injectability, fast self-healing, and suitable on-demand detachment, are highly desired for minimally invasive procedures, but such materials are still lacking. Herein, an injectable self-healing biocompatible hydrogel adhesive with thermoresponsive reversible adhesion based on two extracellular matrix-derived biopolymers, gelatin and chondroitin sulfate, is developed to be used as a surgical adhesive for sealing or reconnecting ruptured tissues. The resulting hydrogels present good self-healing and can be conveniently injected through needles. The strong tissue adhesion at physiological temperatures originates from the Schiff base and hydrogen bonding interactions between the hydrogel and tissue that can be weakened at low temperatures, thereby easily detaching the hydrogel from the tissue in the gelation state. In vivo and ex vivo rat model show that the adhesives can effectively seal bleeding wounds and fluid leakages in the absence of sutures or staples. Specifically, a proof of concept experiment in a damaged rat liver model demonstrates the ability of the adhesives to act as a suitable laparoscopic sealant for laparoscopic surgery. Overall, the adhesive has several advantages, including low cost and ease of production and application that make it an exceptional multifunctional tissue adhesive/sealant, effective in minimally invasive surgical applications.
研究领域:
生物医学工程
·
材料科学
·
外科技术
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2022
·Vol. 11
·期 23
·2201798
·
IF 11.092
Xiaowei Liu,Ying Yang,Haojie Yu,Li Wang,Yan Sheng,Zhikun Huang,Jian Yang,Zhipeng Ni,Di Shen
Hydrogel adhesives are hot spots due to their ubiquity and practical relevance. However, achieving a robust wet adhesion is still a challenge due to the preferential formation of hydrogen bonds between interfacial fluids and bulk hydrogel, as well as targeted substrates. Herein, a half-dry adhesive consisting of a silk fibroin (SF) semi-interpenetrating network and poly(acrylic acid) covalent network, which can allow a rapid liquid adsorption and repulsion process encountering a wet tissue, is reported. The remaining water enables excellent hydrogel flexibility to a dynamic surface, while the β -sheet fold endows its tough bulk strength under the peeling-off process. Notably, the wet adhesion energy versus porcine skin is 1440 J m −2 due to the combination of hydrogen bonds, electrostatic interactions, and chain entanglement derived from SF. In particular, both in vitro and in vivo outcomes indicate excellent hemostatic effects and result in incision closure of skin, artery, gastric perforation, and lung. After the first-stage closure, polyacrylic-silk fibroin adhesive (PSA) sealants can detach from the lung surface, fitting well to the healing period. By virtue of the reliable adhesion and good noncytotoxicity, PSA may be a prospective candidate for tissue sealant and drug carrier applications.
研究领域:
材料科学
·
生物医学工程
·
组织工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 13
·7043-7056
·
IF 3.049
Jian Wang,Quanjing Mei,Lili Lin,Fuhua Sun,Jidong Li,Qin Zou,Yi Zuo,Yubao Li
An obturation biomaterial that possess inherent antibacterial activity has been developed to create a tight seal for the root canal space in treatment. Novel castor oil-based polyurethane sealers composited with different proportions of silver phosphate or zinc oxide nanoparticles were synthesized to investigate the physicochemical properties, antibacterial effect on Enterococcus faecalis, and cytotoxicity on murine fibroblasts compared with commercially available products. The results showed that the physical properties of all of the polyurethane sealers could meet with the standards expected. The microdilatancy character of the polyurethane sealers was particularly preferable for the three dimensional obturation of root canal space. Compared with the silver-loaded polyurethane series, the zinc-loaded polyurethane series showed better antibacterial properties based on the contact mode. Analysis of the kinetics indicated that the setting process of the polyurethane sealers supported a first-order reaction and the setting process was highly effective, with more than 90% of the isocyanate groups participating in the setting reaction within 12 h. This is beneficial for the rapid consumption of monomers, efficiently avoiding inflammation. The in vitro results showed that the polyurethane sealers loaded with zinc oxide nanoparticles or 1 wt% silver phosphate were desirable for cell attachment and proliferation compared with the commercial sealers. In conclusion, the castor oil-based polyurethane-zinc sealers, especially PU-Zn5, present good physicochemical and antibacterial properties and cytocompatibility, and could be a promising candidate for application in the field of root canal treatment.
研究领域:
牙科材料
·
生物材料
·
纳米技术
·
抗菌性能
·
细胞毒性
·
根管治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Pei-Fang Cai,Bing-De Zheng,Ya-Ling Xu,Bao-Xia Li,Zhi-Yu Liu,Ya-Yan Huang,Jing Ye,Mei-Tian Xiao
Collagen (COL) is the most widespread functional protein. Designing and developing dual-dynamic-bond cross-linked COL adhesive hydrogel sealants with multifunctional is highly advantageous for achieving a superior wound closure effect and hemostasis. In this study, we developed hybrid hydrogels consisting of fish-skin COL, oxidized sodium alginate (OSA), borax and polyvinyl alcohol (PVA) to enhance full-thickness wound healing. The hydrogels were furnished with first-rate self-healing capabilities through the dual-dynamic-bond cross-linking of dynamic Schiff base bonds (COL-OSA) and diol boric acid bonds (OSA-borax) with reversible breakage and re-formation. Moreover, the incorporation of PVA stimulated the formation of hydrogen bonds in the system, bolstering the stability of the hydrogel framework. The prepared hydrogel manifests self-healing, injectability, multifunctional adhesiveness and biodegradability. In vivo assessment of the hemostatic capacity of COSP 20 hydrogel was superior to gauze both in the mice liver injury model and mice tail amputation model. In addition, a full-thickness skin wound model in mice revealed that the COSP 20 hydrogel facilitated faster wound closure by accelerating reepithelialization, COL deposition and angiogenesis. These findings illustrate the potential of hybrid fish-skin COL-based hydrogels to enhance wound healing and promote rapid tissue repair, and provide new possibilities for the effective utilization of marine fishery resources.
研究领域:
生物材料
·
伤口愈合
·
止血
·
生物医学工程
·
组织工程
✓ 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）