COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Lianxia Jing,Pengyu Zhang,Yanming Chen,Yunling Gao,Junxian Yun
A superhydrophobic PDMS/DTMS-SiO 2 @PLA membrane with a porous layered three-dimensional rough structure was obtained by a simple phase separation method for the preparation of polylactic acid (PLA) membrane with the addition of a layer of functionalized DTMS-SiO 2 nanoparticles. SEM, EDS, XPS, TGA, and FTIR were used to characterize the surface morphology and chemical composition of the PDMS/DTMS-SiO 2 @PLA membrane. The static water contact angle of the modified membrane could reach 160.7°. The high hydrophobicity remained after 50 abrasion experiments, and the WCA was still greater than 150° after 4 hours of immersion in different pH solutions. For petroleum ether, n-hexane, n-heptane, and isooctane mixtures with water, the modified membrane exhibited excellent oil-water separation capabilities in separation flux and efficiency. Meanwhile, the modified membrane also has good resistance to contamination and self-cleaning ability. Due to the advantages of simple preparation, degradable materials, mechanical stability, chemical resistance, excellent oil-water separation capability, good anti-pollution, and self-cleaning ability, superhydrophobic PDMS/DTMS-SiO 2 @PLA membrane can be applied to practical oil-water separation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Li-Hao Xu,Yan Li,Shen-Hui Li,Ming-Yu Lv,Zhi-Ping Zhao
Expanding the metal–organic frameworks (MOFs) category using room-temperature colloidal chemistry route with regular crystal structure is challenging, but important for reducing energy consumption and realizing an economically viable application in industry. Herein, we developed a novel advanced copper terephthalate MOF (CuBDC) between graphene oxide (GO) layers using a simple space-confined growth strategy at room temperature. The inclusion of CuBDC@GO can realize high filler loadings while maintaining uniform dispersion throughout PDMS matrix. The paralled arranged CuBDC sheets created 1D inner vertical channels, along with the enlarged GO interlayer space for rapid molecule permeselective transport. The resultant mixed matrix membranes (MMMs) with 30 wt% CuBDC@GO loading improved the separation factor from 190.6 to 576.3, and simultaneously increased the total flux from 575.2 to 1357.4 g m -2 h -1 for separating 0.5 wt% butyl acetate at 40 °C. The transport mechanism was explained by adjusting the CuBDC content in composites to examine the significant increase in membrane permeability (from 12.5 to 58.3) and selectivity (from 0.7 to 2.0). Compared to alcohol or ketone, the larger size strip-like butyl acetate molecules are ideal for rapid transport through the CuBDC-supported 1D continuous inner channels, and effectively inhibit the movement of water molecules, ultimately resulting in the largest pervaporation performance improvement in butyl acetate/water separation. This CuBDC@GO prepared by a simple, green and room-temperature synthesis route can be widely applied to prepare defect-free membranes with excellent performance for sustainable applications. We also anticipate that this advanced space-confined growth strategy can be extended to various other MOFs and applications.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
·
IF 3.299
Haiye Wang,Xinzhen Zhao,Chunju He
The polydimethylsiloxane modified silica (SiO 2 -g-PDMS) nanoparticles with hydrophilic core and hydrophobic shell are employed for the hybridization modification of PVDF ultrafiltration membrane to improve the separation and antifouling performances. The results suggest the modified SiO 2 -g-PDMS nanoparticles exhibit improved dispersion and significant amphiphilic characteristics, and the wetting properties of membrane surface and mimetic matrix of hybrid PVDF membranes are distinctly different with the contact angle values at 105° and 15°, respectively. In addition, the added SiO 2 -g-PDMS nanoparticles significantly improve the fouling repulsion and fouling release properties of hybrid PVDF membranes, the anti-adsorption ability and water flux recovery ratio (FRR-W) of hybrid PVDF membranes to the two typical pollutants of bovine serum albumin (BSA) and humic acid (HA) have been significantly improved. This article aims to provide a simple way to improve the antifouling performance of PVDF ultrafiltration membrane with dual-mode multi-functional modifier.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Like Li,Ya-nan Zhang,Mingyue Wang,Hongrui Zhang,Yong Zhao
Real-time and in-situ monitoring the gelation temperature information of the polyacrylamide hydrogel is of great significance for revealing its reaction kinetics information and regulating the performance and quality. In this paper, based on PDMS sensitized in-fiber Mach-Zehnder interferometer (MZI), a sensitive temperature sensor with a temperature sensitivity of 10.22 nm/℃ is proposed, which is used for in-situ thermal monitoring of the gelation process of polyacrylamide hydrogel. By establishing the gelation thermal curve, it is demonstrated that the gelation process mainly includes four stages: initial lag, rapid gelation, cooling stage and stabilization stage. Among them, the rapid gelation stage is the most critical, which shows the heat released in the gelation process and the gelation time. In addition, experimental results confirmed that with the increase of monomer and crosslinker concentration, the heat released during the gelation process gradually increases, but the gelation time is almost unaffected. Since the proposed PDMS sensitized MZI sensor has the advantages of miniaturization, high sensitivity, intrinsically safe, etc., it can be further extended to other dynamic reaction processes for real-time monitoring of temperature information.
研究领域:
材料科学
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生物医学工程
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光学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Kun Wang,Wenxuan Lai,Deren Yang,Xuegong Yu
Optical physical unclonable functions (PUFs) present an innovative solution for verifying the authenticity of clinical biochips. However, achieving biocompatibility and minimizing interference with biochip accuracy remain critical challenges. Here, we report optical PUFs based on nanostructured silica (SiO2)/polydimethylsiloxane (PDMS) composite films. Amorphous SiO2 nanoparticles, synthesized via the sol–gel method, are randomly dispersed within the PDMS matrix through ultrasonication and spin-coating processes. The interplay between the disordered PDMS structure and the nonuniform distribution of SiO2 nanoparticles enhances the complexity of the Raman signals generated by the optical PUFs while ensuring biocompatibility and minimal interference with biochip accuracy. Furthermore, the efficacy of these optical PUFs is assessed by examining key performance metrics, including randomness, uniqueness, reproducibility, and encoding capacity. Additionally, the conceptual application of these optical PUFs for securing biochip supply chains is showcased, providing a robust solution to enhance the security of these critical devices.
研究领域:
材料科学
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生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 11
·1491
·
IF 4.7
Hongyi Zhu,Shunxia Wu,Rui Tang,Yang Li,Gang Chen,Bingxue Huang,Biyou Peng
Electronic devices play an increasingly vital role in modern society, and heat accumulation is a major concern during device development, which causes strong market demand for thermal conductivity materials and components. In this paper, a novel thermal conductive material consisting of polydimethylsiloxane (PDMS) and a binary filler system of h-BN platelets and Al2O3nanoparticles was successfully fabricated using direct ink writing (DIW) 3D printing technology. The addictive manufacturing process not only endows the DIW-printed composites with various geometries but also promotes the construction of a 3D structural thermal conductive network through the shearing force during the printing process. Moreover, the integrity of the thermal conductive network can be optimized by filling the gaps between the BN platelets with Al2O3particles. Resultingly, the configuration of the binary fillers is arranged by the shearing force during the DIW process, fabricating the thermal conductive network of oriented fillers. The DIW-printed BN/Al2O3/PDMS with 45 wt% thermal conductive binary filler can reach a thermal conductivity of 0.98 W/(m·K), higher than the 0.62 W/(m·K) of the control sample. In this study, a novel strategy for the thermal conductive performance improvement of composites based on DIW technology is successfully verified, paving a new way for thermal management.
研究领域:
材料科学
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热管理技术
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增材制造
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2020
·
IF 5.918
Huitao Yu,Yiyu Feng,Long Gao,Can Chen,Zhixing Zhang,Wei Feng
Thermally conductive, robust, but self-healable polymer/carbon nanocomposites are the research focus in functional materials. However, the trade-off between molecular interaction and cross-linking makes it difficult to simultaneously achieve excellent self-healing, high strength, and thermal conduction. Herein, we fabricated boroxine poly(dimethylsiloxane) 2-ureido-4[1H]-pyrimidinone selectively cross-linked by molecular boron ester bonds and hydrogen bonds. By optimizing the reversible interaction, a maximum strength of 7.33 MPa and a high self-healing efficiency of 97.69 ± 0.33% were achieved at a boroxine-to-2-ureido-4[1H]-pyrimidinone molar ratio of 1:3 (BE-PDMS1:3-UPy). Highly robust composites of BE-PDMS1:3-UPy were obtained using a UPy-modified graphene aerogel. A transected sample recovered its mechanical properties (78.83 ± 2.40%) and thermal conductivity (98.27 ± 0.13%) after self-healing at 40 °C for 6 h. The outstanding reversible association/disassociation of hydrogen bonds at the polymer–graphene interface makes the composites to be used as structure–function integrated materials in interfacial thermal conductors.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 32
·期 1
·430-441
·
IF 2.22
Liu Yuping,Wu Peng,Kang Peng,Li Liuyang,Shi Jinchao,Zhou Zheng,Chen Guang-xin,Li Qifang
With the development of new mobile communication systems, the composite substrate used for the wideband antennas will show a suitable dielectric constant, low dielectric loss, and good dielectric stability in a wide frequency range. In this work, a kind of dielectric filler, Sr 2+ -doped CaCu 3 Ti 4 O 12 nanowires (Ca 1− x Sr x Cu 3 Ti 4 O 12 NWs, x SCCTO NWs), was synthesized via a two-step hydrothermal method for the first time. The composites were then prepared by adding the obtained filler to polydimethylsiloxane (PDMS). Results revealed that Sr 2+ doping can significantly reduce the dielectric loss of composites and stabilize both the dielectric constant and the dielectric loss in a wide frequency range compared with those of CCTO NWs–PDMS composites. Moreover, 0.4SCCTO NWs–PDMS composites exhibit high thermal stability, tensile strength, breakdown strength, and energy density. These properties effectively broaden the frequency range of the PDMS based composites, which are very suitable for the application in flexible wideband antenna substrate materials.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 25
·16131-16140
·
IF 4.036
Qiu-Ping He,Ying-Ying Wang,Peng-Fei Wang,Xiao-Ming Dou
Zeolite–polymer composite membranes have become promising and effective materials for the pervaporative separation of liquids, especially for isomeric mixtures. In this paper, silicalite-1/PDMS composite membranes have been used to investigate the separation of dichlorobenzene (DCB) isomers via pervaporation for the first time. Silicalite-1 zeolites modified by the silane coupling agent, NH3–C3H6–Si(OC2H5)3, have been incorporated into polydimethylsiloxane (PDMS). Then, the silicalite-1/PDMS composite membranes have been successfully prepared on porous polyvinylidene fluoride (PVDF) supports. The morphology and structure of the silicalite-1 zeolites and silicalite-1/PDMS composite membranes have been characterized by XRD, FTIR, SEM and BET techniques. The results show that the modified silicalite-1 zeolite particles have smaller pore sizes dispersed more uniformly in the active layers of the silicalite-1/PDMS composite membranes and present fewer aggregation and pinholes formed by the accumulation of zeolite particles. The silicalite-1/PDMS composite membranes are all dense and continuous with good homogeneity. To evaluate the pervaporative separation performance of the DCB isomers, the unmodified and modified silicalite-1/PDMS composite membranes have been further tested in single-isomer and binary-isomer systems at 60 °C. The modified silicalite-1/PDMS composite membranes present higher DCB isomer separation factors. The separation factors of the modified silicalite-1/PDMS composite membranes in the binary-isomer systems for p-/o-DCB and p-/m-DCB are 3.53 and 5.63, respectively. The permeate flux of p-DCB through the modified silicalite-1/PDMS composite membranes in the p-/o-DCB binary-isomer system is 116.7 g m−2 h−1 and in the p-/m-DCB binary-isomer system, it is 93.5 g m−2 h−1. The result provides a new approach towards the pervaporative separation of DCB isomers from their mixture for future industrialization applications.
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
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 40
·10829-10837
·
IF 5.976
Guifang Liu,Yi Chen,Minjie Gong,Xiaoyun Liu,Zhong-Kai Cui,Qibing Pei,Jinlou Gu,Chen Huang,Qixin Zhuang
Three-phase composite films CCTO@MWCNT/PDMS with enhanced dielectric constant (ε) and low dielectric loss are prepared by embedding covalently bonded calcium copper titanate (CaCu3Ti4O12, CCTO) with multi-walled carbon nanotubes (MWCNTs) composite nanoparticles (CCTO@MWCNT), forming a chain-ball structure, into the polydimethylsiloxane (PDMS) matrix. To impede the natural stacking of MWCNTs, CCTO particles are functionalized first with a silane coupling agent containing amino groups, and then react with carboxyl-functionalized MWCNTs (MWCNT-COOH) to achieve the strong linkage between CCTO and MWCNTs, confirmed by the FTIR spectrum and SEM images, etc. The chain-ball CCTO@MWCNT nanoparticles have effectively improved the dielectric permittivity of PDMS. The dielectric constant of the CCTO@MWCNT/PDMS composite film, agreeing well with the percolation theory, is up to 2133 at 1 kHz, higher than that of pure PDMS by a factor of 700, when the volume fraction of MWCNTs approaches the percolative threshold. Meanwhile, the dielectric loss is only 0.19. For comparison, CCTO/PDMS and MWCNT/PDMS films are prepared and investigated as well. The Yamada model can effectively predict the dielectric constant of CCTO/PDMS composite films. The dielectric constants of CCTO/PDMS and MWCNT/PDMS films are 1/180 and 1/6, respectively, in comparison with that of CCTO@MWCNT/PDMS. The tensile strength of CCTO@MWCNT/PDMS approaches 1.12 MPa, 3 times higher than that of pure PDMS.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2016
·Vol. 54
·期 16
·1612-1623
·
IF 3.318
Yunjiao Gu,Shuxue Zhou,Huali Luo,Limin Wu,Wei Gao,Jinlong Yang
Controllable phase segregation adjustment for immiscible polymer blends has always been tough, which hinders the development of amphiphilic antifouling coatings from more accessible blends. Herein, methacrylated poly(dimethylsiloxane) (PDMS-MA) was synthesized and mixed with poly(ethylene glycol)methylether methacrylate (PEG-MA). It was interestingly discovered that these PDMS-MA/PEG-MA blends displayed upper critical solution temperatures (UCST) due to thermo-induced conformational change of PEG-MA and the UCST changed with PDMS-MA/PEG-MA mass ratios. Micro-/nano-phase segregation, nanophase segregation, or homogenous morphology were therefore achieved. These PDMS-MA/PEG-MA blends with different mass ratios were UV-cured under varying temperatures to fabricate coatings. Their surface morphology and wettability are readily adjusted by phase segregation. For the first time, highly hydrophilic surface was achieved for coatings with microphase segregation because of the exposure of PEG-rich domains, which exhibited an enhanced protein resistance against bovine serum albumin (BSA). Anti-bacterial performance ( Shewanella loihica ) was also observed for these PDMS/PEG coatings. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54 , 1612–1623
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Manquan Fang,Chilung Wu,Zhengjin Yang,Tao Wang,Yang Xia,Jiding Li
In this contribution, zeolitic imidazolate framework (ZIF-8)/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared for hydrocarbon recovery using propane/nitrogen mixture as a model feed gas pair. All MMMs obtained a homogeneous particle dispersion and intimate interface interaction, which were confirmed by high resolution scanning electric microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) mapping. Gas permeation test shows that ZIF-8/PDMS MMMs demonstrate an enhanced separation performance with improved separation selectivity (38% higher than that of pure PDMS membranes) and propane permeance over 100 GPU. However, it is worth noting that the enhanced selectivity and decreased permeance of MMMs contradict the prediction by Maxwell model, which suggests the existence of pore blockage and inhibited chain mobility at polymer-particle interface. The inhibited chain mobility is further confirmed by differential scanning calorimetry (DSC) analysis. Based on these observations, a new modified Maxwell model is proposed taking non-ideal interface morphology and particle agglomeration into consideration. Both the selectivity and gas permeance predicted by the proposed model are in good agreement with experimental data, which thereby extends the application scope of original Maxwell model.
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）