INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Tianyun Lu,Xiaokun Han,Dongming Chen,Jianxing Li,Zuocai Zhang,Shaorong Lu,He Wang
Given their environment friendliness, light weight, and availability, bio-films have attracted wide interest for various applications in sensor materials. However, obtaining sensors with good environmental stability, excellent flame retardancy, and high wet strength remains a challenge. Herein, we prepared sensitive water, temperature and flame-responsive multi-function bio-films (named as PSCG bio-films) by combining peach gum polysaccharide , silk nanofibres, citric acid , and graphene. The PSCG bio-films demonstrated good flexibility, rapid and consistent water absorption, and stable wet strength at different temperatures. The bio-films showed excellent water sensitivity and rapid fire responsiveness within a short time frame (2 s); moreover, the response and recovery times of the bio-films in the temperature range of 50–150 °C were 0.1 and 0.3 s, respectively. In addition, the bio-films can be applied to micro-sized fire early warning devices and personalized breath monitoring. Our work presents a facile and green approach (without toxic solvent) to fabricate multi-function sensors with applications in various industries.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Qin Wang,Peiyu He,Cheng Wei,Fengrui Liu,Xianzhong Wang,Yiding Liu,Biao Kang
Despite the recent developments in hydrochromic materials, visual detection of water level in plastic materials without sacrificing mechanical properties remains a meaningful yet challenging topic. Currently, to optimize the sensitivity, hydrochromic agents are usually incorporated into hygroscopic matrixes to form bulk solids, which have restricted compatibility for the direct application inside other polymer materials. In this study, this challenge is tackled by nanoscale incorporation of hydrochromic agent into a hygroscopic polymer by miniemulsion polymerization. The obtained hydrochromic nanocapsule has an average diameter ≈110 nm, shows reversible hydrochromic property after 10 cycles, and can offer the first directly eye-readable signal about the real time in situ water level in plastic materials with a water level below 4 wt.%, while achieving a 214% enhancement of the toughness at the same time. Comprehensive researches by investigating the composition and viscoelastic transition of the nanocapsules has shed light on the mechanisms concerning hydrochromic sensitivity and toughening effect. This simple methodology not only offers a new route for the nanoscale incorporation and application of different hydrochromic materials, but also inspires the development of smart nanoparticles with other stimuli-responsive functionalities. All these aspects should render this work interesting for both scientific researches and engineering practices.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Jiamin Zhang,Lifeng Chen,Yongqing Bai,Minghao Xue,Weiwei Sheng,Baofeng Hou,Huiyong Zeng,Xiaoxia Shang
To address the technical challenges of poor temperature resistance and the tendency to cause reservoir pore throat blockage in traditional organic cationic polymer (OCP) clay stabilizers, this paper successfully prepared a high cationic density branched ternary network polymer (PATSA) through emulsion polymerization, using (3-acrylamidopropyl) trimethylammonium chloride (APTAC), styrene (St), and acrylonitrile (AN) as functional monomers, and 1,4-divinylbenzene (DVB) as a crosslinking agent. The successful synthesis of PATSA was confirmed by infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy ( 1 H NMR); gel permeation chromatography (GPC) and polyelectrolyte titration tests showed a number average molecular weight ( M n ) of 5.83 × 10 4 and a heavy average molecular weight ( M w ) of 8.72 × 10 4 (PDI = 1.50), and cationic charge densities up to 4.6 meq/g. Zeta potential as well as contact angle tests show that PATSA achieves charge reversal and promotes aggregation of clay particles to inhibit hydration swelling through electrostatic adsorption of quaternary ammonium groups to the clay surface, while not causing reservoir damage due to wetting reversal. Zeta potential and contact angle tests demonstrate that PATSA achieves charge reversal through electrostatic adsorption between quaternary ammonium groups and clay surfaces, promoting clay particle aggregation to inhibit hydration swelling, while avoiding wettability alteration that could cause formation damage. The results of core flow experiments show that under the harsh conditions of high temperature (120°C), high clay content (9%), and high flow rate (0.5 mL/min), PATSA exhibits excellent clay stabilization performance, scouring resistance, and reservoir protection ability, and is able to effectively inhibit clay particle transport and reduce water-sensitive reservoir damage, with a significantly better performance than the comparison reagents. The correlation pattern between water-sensitive injury and clay particle size was revealed by clay particle size analysis; XRD analysis showed that the montmorillonite layer spacing shrank to a relative minimum after PATSA treatment (d 001 = 1.559 nm); SEM observations confirm that PATSA effectively inhibits clay swelling and dispersion through electrostatic adsorption and hydrophobic interactions, while producing fewer aggregated flocculated clay particles compared to conventional OCP treatment, thereby avoiding secondary plugging issues. The mechanism study shows that PATSA achieves effective prevention and control of clay hydration expansion and migration and mitigation of water-sensitive reservoir damage through the synergistic mechanism of quaternary ammonium cation electrostatic adsorption, styrene hydrophobic barrier, and acrylonitrile cyano group. This study provides an innovative solution with both high efficiency and low risk for reservoir protection in water injection development of low permeability reservoirs.
研究领域:
石油工程
·
油田化学
·
高分子材料
·
储层保护
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胶体与界面科学
✓ 已验证
产品关联
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2024
·Vol. 50
·期 13
·10327-10344
·
IF 2.6
Xu Ruifeng,Wang Shuoshi,Guo Ping,Hukuang Haoxiang,Yuan Na
The CO 2 -WAG injection method proposed for unconventional tight oil reservoirs has been successfully applied in field. However, for water-sensitive tight oil reservoirs, there is a lack of research focusing on the displacement mechanisms and effects of WAG injection at the pore scale. And the gap between nuclear magnetic resonance (NMR) and computerized tomography (CT) scanning technologies is not well explored. This study integrated deuterium oxide-shielded NMR and contrast agent (n-butane iodide and lead iso-octanoate mixture) enhanced micro-CT to study the immiscible CO 2 -WAG mechanisms for water-sensitive tight oil. The aim is to investigate the microscopic distribution and displacement mechanisms of residual oil after CO 2 flooding and WAG injection in water-sensitive cores. Experimental results showed that NMR experiments and CT experiments identified the microscopic distribution of oil at different injection stages successfully. The contrast agent, despite its similar viscosity ratio, had poor representativeness in other properties, leading to significant differences in the microscopic fluid distribution results compared to NMR experiments. The primary WAG flood mechanism observed was that CO 2 dispersed oil droplets, with most being displaced out of the pores, while water played a mobility control role by blocking large pores. However, due to water sensitivity, medium and small pores also experienced blockage, making the effect of WAG injection after CO 2 flooding not significant. In the NMR experiment, the final recovery of core 6–1 after WAG injection was 64.71%. In the CT scan experiment, due to the smaller volume of the microcore, the water sensitivity effect was relatively weaker, and under the stronger influence of the capillary end effect, the final recovery reached 76.91%. In the five sets of long-core experiments, by controlling the gas–water ratio and slug size, the recovery ranged from 56.51 to 64.04%. The core flood experiments validated the representativeness of the microscopic experiments. And for water-sensitive tight oil reservoirs, controlling the volumes of water and CO 2 during the WAG injection process is crucial.
研究领域:
石油工程
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油气田开发
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渗流力学
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岩石物理
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提高采收率
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）