JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 15
·12002-12015
·
IF 2.779
Wang Wenwei,Hu Yongcai,Li Liangjie,Zeng Jinling,Yao Yingbang
In this study, the contents of ethyl cellulose (EC) as thickener in organic vehicle, which also acts as a binder, was examined using various control experiments; dibutyl phthalate (DBP) and dioctyl phthalate (DOP) were used as plasticizers, and acrylic resin (AR) was used as the thixotropic agent. In addition to thixotropic index, Bigham and Casson yield stress models were used for simulation, and the organic vehicle was dynamically simulated via the three interval thixotropy test; the viscosity recovery of the organic vehicle was investigated on the removal of shear stress. When the contents of the plasticizers, DBP and DOP, were 4 wt% and 6 wt%, respectively, the content of the thickener, EC, was 12 wt% and that of the thixotropic agent, AR, was 2 wt%, the comprehensive performance of the organic vehicle was greatly improved, especially in terms of thixotropy and recovery behavior. Our results demonstrate that the current organic vehicle is promising for the application of silver pastes used as inner electrodes in low-temperature co-fired ceramic (LTCC).
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
Soft Matter
·
2021
·Vol. 17
·期 30
·7158-7167
·
IF 3.679
Hanqi Xu,Jinbo Wu,Yaying Hong,Weijia Wen
The impact of two nonionic surfactants, namely Span 20 and Span 85, on the electrorheological response and colloidal stability of urea-coated barium titanyl oxalate (BTRU)/silicone oil suspensions is investigated. We quantitatively analyze the surfactant effect on modified ER performance through the measurements of yield stress and current density, as well as the tuned suspension stability through calculation of the Turbiscan stability index (TSI) and naked-eye observations of sedimentation phenomena. The surfactant effect on particle–oil interactions and agglomeration effects is examined by measuring the permeability of silicone oil when mixed with the Span surfactant and the cluster size of particles in dispersing medium, respectively. Our results indicate that with the presence of a Span surfactant, the yield stress of the suspension exhibits a local maximum at certain Span concentrations. We hypothesize that below the optimal Span concentration, the ER properties are enhanced by the increase of the electrostatic interaction between particles. Above the limiting concentration, the ER activity is weakened by the formation of a double-layer surfactant structure that generates a steric hindrance effect. We discover that the addition of the Span surfactant favors the improvement of the particle agglomeration phenomenon, thereby promoting colloidal stability of the suspension. Consequently, in the consideration of both ER properties and suspension stability, an optimal ER fluid with the addition of 0.4 wt% Span 85 is acquired with remarkable integrated ER properties.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Yuming Bo,Anru Guo,Heng Zhao,Dong Liu
Epoxy resin (ER) thermosets are widely applied in various fields due to their high mechanical strength, thermal stability and chemical corrosion resistance. However, the brittleness of ER thermosets and low thixotropic property of ER matrix largely limits their further development. Here, this article develops branched polyethyleneimine (PEI) functionalized carbon nanotube (PEI@CNT) as high-performance nanofiller for simultaneously strengthening and toughening ER thermosets. Benefiting from good dispersity and rich amine groups of PEI@CNT, effective interfacial bonding between PEI@CNT and ER is achieved. The ER thermoset with 0.5 wt% PEI@CNT shows increase in tensile strength by 24.8 % and fracture elongation by 30.0 % compared with pristine ER thermoset. The enhanced mechanical properties of PEI@CNT modified ER thermosets can be ascribed to the chemical interaction between PEI@CNT and ER matrix as well as the formed crack propagation, which can dissipate a lot of fracture energy, further improving the strength and toughness of the ER composites. More importantly, the thixotropic property of ER matrix is largely improved after adding the PEI@CNT filler. This work reports a high-performance nanofiller for enhancing mechanical properties of ER thermosets and processability of ER matrix.
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
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yuankun Wang,Wenyuan Xie,Defeng Wu
Two kinds of anisotropic cellulosic nanoparticles, cellulose nanocrystal (CNC) and nanofiber (CNF), were used as additives for the aqueous carbonyl iron particles (CIPs) based magnetorheological (MR) fluids, aiming at disclosing effect of nanocelluloses on the magneto-responsive behavior and stability of MR fluids. Both CNC and CNF can stabilize MR fluids, and improve their sensitivity to alterations of magnetic field strengths. Relative to electrostatic repulsion, physical hindrance is more important to the stability improvement. Thus, CNF is the better option because it has higher aspect ratio and surface charge. Moreover, the presence of cellulosic nanoparticles hinders coalescence of CIP chains to stronger columns, and hence the nanoparticles stabilized MR fluids show thixotropy evidently. At the comparative concentration (0.3 wt%), the presence of CNF even enhances the magneto-responsive levels because the percolated CNF network acts as stress amplifier. This work opens up a new door for applications of nanocelluloses in MR fluids.
研究领域:
材料科学
·
胶体化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Gels
·
2022
·Vol. 8
·期 3
·193
·
IF 4.432
Shipeng Chen,Li Feng,Xiaoji Wang,Yange Fan,Yubin Ke,Lin Hua,Zheng Li,Yimin Hou,Baoyu Xue
Owing to the potential of sodium as an alternative to lithium as charge carrier, increasing attention has been focused on the development of high-performance electrolytes for Na batteries in recent years. In this regard, gel-type electrolytes, which combine the outstanding ionic conductivity of liquid electrolytes and the safety of solid electrolytes, demonstrate immense application prospects. However, most gel electrolytes not only need a number of specific techniques for molding, but also typically suffer from breakage, leading to a short service life and severe safety issues. In this study, a supramolecular thixotropic ionogel electrolyte is proposed to address these problems. This thixotropic electrolyte is formed by the supramolecular self-assembly of D-gluconic acetal-based gelator (B8) in an ionic liquid solution of a Na salt, which exhibits moldability, a high ionic conductivity, and a rapid self-healing property. The ionogel electrolyte is chemically stable to Na and exhibits a good Na+transference number. In addition, the self-assembly mechanism of B8 and thixotropic mechanism of ionogel are investigated. The safe, low-cost and multifunctional ionogel electrolyte developed herein supports the development of future high-performance Na batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Feiyang Huang,Lifeng Chen,Weiwei Sheng,Xiaoxia Shang,Zhaonian Zhang
High thixotropic polymer fluids are less prone to gravity collapse and leakage after injected into large-scale space, facilitating complete three-dimensional filling in the annulus of horizontal wells. Therefore, thixotropy is crucial for effective water plugging. To address the limitations of weakened stacking interactions among polymer chains and reduced hydrogen bonding of nanoparticles at high temperatures, a high-temperature thixotropic polymer nanofluid was developed using a composite of nano laponite and thermosensitive polymer poly(acrylamide-acrylamidomorpholine-2-acrylamide-2-methylpropanesulfonic acid) (P(AM-ACMO-AMPS)). The study focused on the structure-activity relationship and gelation properties of the gel at 120℃. The gel exhibited good thixotropy at 120℃, increasing with higher concentrations of polymer and nano laponite. At 1 wt% polymer concentration, the thixotropy value reached 1.445. The scanning electron microscopy (SEM) images indicated that the gel formed a dense three-dimensional network structure of interlaced interpenetration after shearing, enabling smooth and complete annulus filling without gravity collapse. The gel showed a shear thinning coefficient inversely related to solvent dispersion forces and a shear recovery time proportional to solvent polar forces. Gelation time was controllable from 1 to 12 hours, with an elastic modulus reaching 93.9 Pa after gelation. It showed good temperature and salt resistance stability with high quality retention rates. The radial and axial slip pressure gradients at 120℃ were 4.38 MPa/m and 7.34 MPa/m, maintaining 3.96 MPa/m and 6.16 MPa/m after two months, demonstrating excellent compressive strength. The breakthrough pressure gradient reached 18.5 MPa/m, sustaining a plugging rate over 95 %, indicating excellent plugging performance and erosion resistance.
研究领域:
石油工程
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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
·
2023
·
IF 9.5
Lin Xu,Ying Pan,Xuanqi Wang,Zhijun Xu,Huasheng Tian,Yue Liu,Xiaodan Bu,Houchao Jing,Tianyu Wang,Yaqing Liu,Minghua Liu
Touch panels based on ionic conductive hydrogels perform excellent flexibility and biocompatibility, becoming promising candidates for the next-generation human–machine interface. However, these ionic hydrogels are usually composed of cross-linked polymeric networks that are difficult to be recycled or reconfigured, resulting in environmental issues. Herein, we designed a lithium ion-triggered gelation strategy to provide a conductive molecular hydrogel with thixotropy, which can be mechanically recycled or reconfigured at room temperature. In this hydrogel, lithium ions function as ionic bridges to construct supramolecular nanoassemblies and charge carriers to impart ionic conductivity. With polymer additives, the mechanical accommodability of the hydrogel was improved to meet the requirements of the daily use of touch panels. When this molecular hydrogel was fabricated into a surface capacitive touch panel, real-time sensing and reliable touch locating abilities were achieved. Remarkably, this touch panel can be reconfigured into 1D, 2D, and 3D device structures by a simple stirring–remolding method under ambient conditions. This work brings new insight into enriching the functionalities of hydrogel-based ionotronics with a supramolecular approach.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2015
·
IF 4.891
Min Xue,Yanchao Lü,Qingqing Sun,Kaiqiang Liu,Zhen Liu,Ping Sun
Three Schiff base ligands containing two pyridine rings, S1, S2, and S3, show strong gelation abilities with AgNO3 in several pure or mixed solvents at room temperature. 1H NMR and Fourier transform infrared spectroscopy measurements not only demonstrated the coordination interaction between silver ion and nitrogen atom of the pyridine ring of the S2 ligand in S2-Ag metallogel, but also showed that hydrogen bonding contributes to the formation of the metallogels. In particular, S2-Ag metallogel shows a super smart and fully reversible thixotropic property, which has been rarely reported before in metallogels. X-ray diffraction (XRD) analysis revealed that S2-Ag metallogel in DMF takes a mixture of hexagonal and tetragonal packing modes. On the basis of the results of XRD and mass spectrometry analysis, a possible structure evolution process for the gel was proposed. And this model was further demonstrated by the results of polarizing microscopy and thermogravimetric analysis of S2-Ag metallogel.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Quan Zhang,Jincheng Mao,Xinghua Qu,Yuemin Liao,Anqi Du,Heng Zhang,Baiyan Liu,Yachen Xiao,Yongqi Zhang,Chong Lin,Xiaojiang Yang,Yang Zhang
Fumed silica is combined with highly mineralized water to configure polymeric fracturing fluids for fracture and oil-repellent applications. The properties of fracturing fluids have been systematically studied with regard to thixotropy , shear viscosity, viscoelasticity, and viscosity–temperature relationships. Molecular dynamics simulations are commonly used to discover how fumed silica works in highly mineralized fracturing fluid. Results show that fumed silica can effectively enhance the thixotropy of highly mineralized fracturing fluid. Fumed silica enhances the temperature resistance of highly mineralized fracturing fluid (variation of the Arrhenius constant). Based on SEM analysis, fumed silica can help polymers bond together. In highly mineralized fracturing fluid, fumed silica generates a supramolecular weak gel, which strengthens the weak gel. In addition, molecular dynamics simulations indicate that fumed silica strengthens polymer–nanoparticle–water interactions.
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 7
·916-925
·
IF 4.1
Zhang Bin,Dou Zheng-Li,Zhang Yong-Zheng,Fu Qiang,Wu Kai
Effective thermal transport across solid-solid interfaces, essential in thermal interface materials (TIMs), necessitates both optimal thixotropy and high thermal conductivity. The role of filler surface modification, a fundamental aspect of TIM fabrication, in influencing these properties is not fully understood. This study employs the use of a silane coupling agent (SCA) to modify alumina, integrating experimental approaches with molecular dynamics simulations, to elucidate the interface effects on thixotropy and thermal conductivity in polydimethylsiloxane (PDMS)-based TIMs. Our findings reveal that varying SCAs modify both interface binding energy and transition layer thickness. The interface binding energy restricts macromolecular segmental relaxation near the interface, hindering desirable thixotropy and bond line thickness. Conversely, the transition layer thickness at the interface positively influences thermal conductivity, facilitating phonon transport between the polymer and filler. Consequently, selecting an optimal SCA enables a balance between traditionally conflicting goals of high thermal conductivity and minimal bond line thickness, achieving an impressively low interface thermal resistance of just 2.45–4.29 K·mm 2 ·W −1 at 40 psi.
研究领域:
材料科学
·
分子动力学模拟
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界面化学
✓ 已验证
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 17
·2397
·
IF 4.9
Zhilei Zhang,Yuan Geng,Ren Wang,Zhiyuan Yan,Minghao Sun,Sicong Meng,Yan Zhang,Hong Yang,Yaoxuan Li,Yuecheng Zhu
To address the issues of traditional gels in high-temperature reservoir leakage plugging, such as injection–retention imbalance, poor high-temperature stability, and insufficient thixotropy, this study developed a thixotropic polymer gel system via molecular design and component optimization, aiming to achieve excellent thixotropy, high strength, and wide temperature adaptability (80–140 °C) while clarifying its gelation mechanism. First, the optimal polymer was selected by comparing the high-temperature stability and crosslinking activity of AM/AMPS copolymer (J-2), low-molecular-weight acrylamide polymers (J-3, J-4), and AM/AMPS/NVP terpolymer (J-1). Then, the phenolic crosslinking system was optimized: hexamethylenetetramine (HMTA) was chosen for controlled aldehyde release (avoiding poor stability/dehydration) and catechol for high crosslinking efficiency (enhancing strength via dense crosslinking sites). Urea–formaldehyde resin (UF) was introduced to form a “polymer-resin double network,” improving high-temperature compression resistance and long-term stability. Cyclic shear rheological tests showed the gel system had a larger hysteresis area than the polymer solution, indicating excellent thixotropy before gelation. It gelled completely at 80–140 °C (gelation time shortened with temperature). At 120 °C, its viscosity was 7500 mPa·s, storage modulus (G′) 51 Pa, and loss modulus (G″) 6 Pa, demonstrating good shear thixotropy. The final system (1% J-1, 0.3% catechol, 0.6% HMTA, 15% UF) is suitable for high-temperature reservoir leakage plugging.
研究领域:
高分子科学
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石油工程
·
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Qiang Liu,Yang Lei,Qing Zeng,Chenxi Li,Gang Sun,Bo You,Weidong Ren
To obtain eco-friendly high solid and excellent anti-corrosive polyaspartic (PAS) coating, a novel self-thixotropic nanofiller, hydrogenated castor oil modifying graphene oxide (HMGO) nanosheet , was fabricated and blended into the PAS coating to enhance its corrosion resistance . The self-thixotropic HMGO nanosheets were synthesized from 3-aminopropyltriethoxysilane (APTES) modified graphene oxide sheets by grafting the hydrogenated castor oil (HCO) with long alkyl chain molecular structure. HMGO could form a three-dimensional hydrogen network, separating and stabilizing the nanosheets in the polyaspartic coating matrix homogeneously, so that the HMGO/polyaspartic nanocomposite coating did not contain free low molecules or free inorganic nanofillers. Electrochemical impedance spectroscopy (EIS) and salt spray testing of HMGO/polyaspartic nanocomposite coatings with 86 wt% high solids have shown that corrosion protection properties have been significantly improved with the addition of self-thixotropic HMGO nanofiller. Compared with other nanofillers, including graphene oxide and APTES modified graphene oxide, HMGO nanosheets presented an impressive improvement in corrosion resistance of polyaspartic coatings. The superiority of HMGO/polyaspartic nanocomposite coating is owing to the self-thixotropic effect of HMGO promoted homogeneous distribution and high compatibility of HMGO nanosheets in polyaspartic polymer matrix .
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
危险品化学品经营许可证（带存储）