ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Qian Zhao,Jiafang Piao,Weipan Peng,Yang Wang,Bo Zhang,Xiaoqun Gong,Jin Chang
Identifying the microRNA (miRNA) expression level can provide critical information for early diagnosis of cancers or monitoring the cancer therapeutic efficacy. This paper focused on a kind of gold-nanoparticle-coated polystyrene microbeads (PS@Au microspheres)-based DNA probe as miRNA capture and duplex-specific nuclease (DSN) signal amplification platform based on an RGB value readout for detection of miRNAs. In virtue of the outstanding selectivity and simple experimental operation, 5′-fluorochrome-labeled molecular beacons (MBs) were immobilized on PS@Au microspheres via their 3′-thiol, in the wake of the fluorescence quenching by nanoparticle surface energy transfer (NSET). Target miRNAs were captured by the PS@Au microspheres-based DNA probe through DNA/RNA hybridization. DSN enzyme subsequently selectively cleaved the DNA to recycle the target miRNA and release of fluorophores, thereby triggering the signal amplification with more free fluorophores. The RGB value measurement enabled a detection limit of 50 fM, almost 4 orders of magnitude lower than PS@Au microspheres-based DNA probe detection without DSN. Meanwhile, by different encoding of dyes, miRNA-21 and miRNA-10b were simultaneously detected in the same sample. Considering the ability for quantitation, high sensitivity, and convenient merits, the PS@Au microspheres-based DNA probe and DSN signal amplification platform supplied valuable information for early diagnosis of cancers.
研究领域:
生物化学
·
分子生物学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Li-Ping Wang,Yu-Chao Li,Li-Feng Chen,Chao-Lei Ban,Guang Li,Jun-Jie Ni
Poly(styrene)- b -poly(N-isopropylacrylamide) (PS- b -PNIPAM) amphiphilic diblock copolymers were synthesized via reverse iodine transfer polymerization (RITP) firstly. And then the honeycomb structured porous films were fabricated by drop the amphiphilic diblock copolymer solutions on glass substrates . The porous films were characterized using field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM), respectively. The results showed that the regular honeycomb patterned porous film was achieved successfully by employing the block copolymer with a significantly larger polystyrene block proportion into the solution and the pore diameter of the film decreases obviously with the polymer concentration increased. The effects of airflow speed and Ag particles on porous films are also discussed in this study.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 46
·17472-17480
·
IF 8.067
Xiaowei Zhu,Yijiang Li,Tianchen Wei,Yichen Li,Tieling Xing,Matthew D. Shawkey,Guoqiang Chen
Photonic structures constructed from colloidal nanospheres present an attractive prospect for structural coloration in an ecological manner. However, the application of structural color in the field of textile coloration is usually blocked by their uncorrelated scattered light and feeble mechanical properties. Here, a non-iridescent structural color coating with high color saturation and mechanical stability is developed by assembling PS@TA–Fe(III) core–shell nanospheres. The rough surface and low surface charge are favorable for forming amorphous colloid arrays (ACAs) by restricting the crystalline alignment during the assembly process, resulting in non-iridescent structural colors. In addition, the as-prepared structurally colored cotton fabric possesses high color saturation and mechanical stability thanks to the intense light absorption and interface adhesion of the TA–Fe(III) shell. The preparation approach of this structural color coating is facile, low-cost, and environment-friendly, showing promising applications in textile coloration and smart displays.
研究领域:
材料科学
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 4
·2174-2184
·
IF 0
Zhang Diansen,Xia Yuzheng,Gong Hongliang,Zhang Dong,Chen Xiaonong,Shi Shuxian,Lei Lei
Polylactide-b-poly(N-isopropylacrylamide)-b-polystyrene (PLA-b-PNIPAM-b-PS) triblock copolymers (tri-BCPs) with various chemical compositions (block ratio) were prepared from the combination of ring-opening polymerization and reversible addition-fragmentation
chain transfer polymerization. Subsequently, the self-assembling behaviors of these tri-BCP films obtained from spin-coating were investigated by annealing them under different solvent atmosphere. We found that these films could self-assemble into various morphologies due to the microphase
separation of incompatible copolymer blocks. Atomic force microscopy confirmed the perpendicular cylindrical morphology self-assembled from PLA4.5k-b-PNIPAM5.2k-b-PS22.4k tri-BCP film under mixed solvent atmosphere of toluene/acetone (7:3, v/v).
Self-assembled PLA cylinders are evenly distributed among the PS matrix and perpendicular to the film surface, with PNIPAM component taking place at the PLA/PS interphase. Furthermore, by etching the degradable PLA component, porous PS film decorated with PNIPAM “brushes” hoisting
channels were generated. This work provides a facile method and detailed protocol for fabricating stimuli-responsive porous films which are promising for thermoresponsive “smart” separation technologies.
研究领域:
材料科学
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高分子化学
·
纳米技术
✓ 已验证
DOI
PubMed
Journal of Environmental Sciences
·
2024
·
IF 5.9
Zheng Qi,Zaihui Huang,Chunguang Liu
Advanced oxidation processes (AOPs) exhibit significant potential for water disinfection due to their generation of large quantities of highly oxidizing free radicals. However, the neglect of viable but nonculturable (VBNC) cells obscures their true disinfection efficacy and potential environmental health risks. Therefore, the study evaluated the disinfection effectiveness and mechanisms of typical AOPs, including Fe/H 2 O 2 , Fe/persulfate (PS), and O 3 , from the perspective of the production of VBNC bacteria. The results indicate that Fe/PS exhibits the strongest bacterial inactivation rate (99.94%), and the cells lose their ability to reactivate. Fe/H 2 O 2 and O 3 induce more cells to enter the VBNC state compared to Fe/PS. Moreover, different AOPs result in varying levels of free radical production and utilization efficiency, with SO 4 •− and O 3 exhibiting greater selectivity in deactivating bacteria compared to HO • . The inhibition of VBNC bacteria production by Fe/PS treatment may be attributed to the combined action of HO • and SO 4 •− on microorganisms, leading to oxidative stress and metabolic disruption in bacteria through the inhibition of biofilm formation and aminoacyl-tRNA biosynthesis ( p < 0.05), thereby causing direct bacterial death rather than entry into the VBNC state. In contrast, Fe/H 2 O 2 and O 3 result in the upregulation of the metabolism of alanine, aspartate, and glutamate, as well as styrene degradation capacity by the bacteria, leading to the production of more VBNC bacteria. Overall, the study offers insights into mitigating potential biological risks in water disinfection and developing environmentally friendly and efficient disinfection technologies.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER TESTING
·
2018
·
IF 2.247
Wenqi Wang,Zhiwei Bai,Shiping Zhang,Jiahong Guo,Ting Wei,Jikui Wang
Styrene maleic anhydride (SMA)-g-APA6 copolymer was firstly synthesized by free radical polymerization of styrene and followed by anionic polymerization of ε-caprolactam. The polyamide 6 (APA6)/polystyrene (PS) blends were successfully prepared via anion polymerization. Among in, SMA was acted as both compatibilizer and macromolecular activator. A series of APA6/PS blends with different SMA addition amounts were synthesized to study the effect of SMA on crystallinity , morphology, water resistance, thermal stability and mechanical properties using X-ray diffraction analysis, differential scanning calorimetry , scanning electron microscopy analysis , contact angle measurement, water absorption measurement, molau test, thermogravimetric analysis , stretching and impact test. Correlational analysis proved that the obtained SMA-g-APA6 copolymer has good dispersion with PS. In addition, APA6/PS blends possess good mechanical properties, thermostability and hydrophobic property.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Songhan Hu,Mingyuan Ma,Wei Sun,Guowei Pan,Kai Wang,Qiang Wang
The impacts of nanoplastics on the environment and organisms are gradually increasing, using MRI to detect the metabolic pathways of nanoplastics has low sensitivity and requires magnetic particles for enhanced visualization. In this study, we used Mn 0.6 Zn 0.4 Fe 2 O 4 nanoparticles as magnetic particles and coated them with polystyrene to afford polystyrene composite microspheres (ZMF@PS) with enhanced contrast performance. The effects of the polymerization parameters on the morphology and loading rate of the magnetic ZMF@PS composite microspheres were investigated. In addition, the effect of the magnetic contrast agent (ZMF particles) on the magnetic properties of the ZMF@PS composite microspheres was examined. The results show that when MAA and KPS quantities are 1 mL and 0.02 g, respectively, ZMF was uniformly distributed in the ZMF@PS composite microspheres exhibiting a good coating effect, with an average microsphere size of only 151.09 nm. Regarding the contrast performance, an increase in the ZMF content increased the loading rate, saturation magnetization intensity, and relaxation rate of the ZMF@PS composite microspheres.
研究领域:
材料科学
·
医学影像
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Daihui Zhang,Chunqing Yang,Jun Wang,Yukun Liu,Jiahui Shao,Dongzhi Zhang
In recent years, flexible wearable pressure sensors have emerged as a pivotal technology in the realms of intelligent health monitoring and artificial intelligence, steadily gaining traction as a prominent research focus. However, the conventional production process for conductive fillers is often cumbersome and costly, which limits their widespread application and large-scale manufacturing. In this study, a flexible pressure sensor based on polypropylene fluted woven fabric MXene/PS was proposed. The flexible pressure sensor uses spin-coated PS surface encapsulation technology to make the fabric surface hydrophobic, in order to improve the stability of the sensor. The sensor exhibits a wide strain range (0–565 kPa), excellent repeatability and stability (over 15 000 s), and a fast response–recovery time (75/159 ms), which can be attributed to the superior mechanical properties of the polypropylene-potted woven fabric. The MXene/PS pressure sensor can detect subtle deformations of small and medium-sized joints, making it suitable for detecting human motion signals. Additionally, combined with the deep belief network (DBN) algorithm, it can efficiently and accurately recognize human yoga postures, which shows its great application potential in human motion posture monitoring and low-cost flexible electronic products.
研究领域:
材料科学
·
人工智能
·
健康监测
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Yan Wang,Jie Zhang,Jianlei Lu,Nan Hai,Jiawei Zhang
In this study, we developed a poly(styrene- b - N -isopropyl acrylamide) (PS- b -PNIPAm) block copolymer-incorporated hydrogel with cooling/water dual-responsive shape recovery performance. Three kinds of PS- b -PNIPAm block copolymers with different chain lengths of PNIPAm were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization, and the block copolymers could self-assemble into micelles with PNIPAm as the outer layer in water. Hydrogels were then prepared by introducing the micelles formed by the block copolymers into the polyacrylamide (PAM) network. The collapse of PNIPAm chains could be promoted by both temperature and salt, which acted as temporary crosslinks to stabilize temporary shapes, enabling cooling- and water-stimulated shape recovery. Moreover, fluorescent information could be encoded on the surface of the hydrogel and encrypted by the shape changes of the hydrogel during the shape fixing process, with the information revealed under UV irradiation after the shape recovery process, achieving information security. This approach could accelerate the evolution of shape memory hydrogels and broaden their applications across diverse fields.
研究领域:
材料科学
·
高分子化学
·
智能材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaobo Hu,Yanqiao Xu,Jiancheng Wang,Jiaxin Ma,Lianjun Wang,Wan Jiang
CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are emerging as promising candidates for fluorescence sensors due to their superior optoelectronic properties. However, the poor stability restricts their practical applications in aqueous fluorescent detection. Herein, we report in-situ encapsulation of CsPbX 3 NCs into uniform PVDF-HFP/PS polymer nanofibers with fine diameter of only 49.9 ± 2.2 nm by one-step electrospinning process. The as-fabricated CsPbX 3 @PVDF-HFP/PS nanofibers exhibit high photoluminescence quantum yield (PLQY) of 90%, tunable emission wavelength covering the whole visible range of 451.5–650.8 nm. Most importantly, the water stability of nanofiber membranes can be significantly improved by introducing the 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTMS) as hydrophobic additives, in which their PL intensity can retain 88% initial value after water immersion for up to 100 days. The universality of this fabrication strategy for the stable nanofibers is demonstrated by utilizing different types of polymers and perfluorosilanes (PFSs). Taking advantage of excellent optical properties, fine diameter and high hydrophobicity of PFDTMS-modified CsPbBr 3 @PVDF-HFP/PS nanofibers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) in aqueous solution with maximum fluorescence resonance energy transfer (FRET) efficiency up to 80.9% and 69.7% are realized, respectively. Notably, these electrospun nanofiber membranes possess outstanding durability and recyclability, indicating their great potential in multifunctional photoelectric applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 117
·96911-96917
·
IF 3.84
Zhenliang Feng,Wenrui Wei,Litong Wang,Ruoyu Hong
Cross-linked PS-DVB/Fe3O4 microspheres (PFM-3) have been successfully synthesized by a new magnetic colloid swelling polymerization method and further functioned by alternatively using methylamine and 1,4-butanediol diglycidyl as monomers to build a branching polymer with quaternary ammonium groups. The characterization of PFM has been performed by XRD, FT-IR, SEM, TEM and BET surface area analyses. The results showed that PFM-3 possessed a high ion adsorption capacity (149.25 mg g−1) and could adsorb nitrate ions from water efficiently. The material also showed excellent reusability (after washing with sodium chloride, the absorption capacity was little reduced). More importantly, the magnetic microspheres could be removed from waste water easily via introducing an external magnetic field, which made the discoveries in this study provide an effective and environmentally friendly approach for fast removal of nitrate from waste water.
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
RUBBER CHEMISTRY AND TECHNOLOGY
·
2016
·Vol. 89
·期 4
·700-711
·
IF 0.878
Hong Kan,Ni Xufeng,Shen Zhiquan
Organic supporter poly(styrene-co-divinylbenzene) (PS-DVB) was synthesized, and gas-phase polymerization of 1,3-butadiene was performed with PS-DVB–supported Nd(vers) 3 /Al 2 Et 3 Cl 3 /Al(i-Bu) 3 catalysts. Millimeter-sized granules of high cis -1,4 content (>98%) polybutadiene with an M n of 5.3–5.5 × 10 5 were obtained. Dispersants used in gas-phase polymerization of 1,3-butadiene have a significant influence on apparent activities of catalysts and appearance of products. The morphology of polybutadiene granules was also investigated by scanning electron microscopy.
研究领域:
高分子化学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）