Nano Energy
·
2020
·
IF 16.602
Ziyu Wang,Peng Bi,Yang Yang,Hongyu Ma,Yuchi Lan,Xiaolong Sun,Yue Hou,Hongyu Yu,Gengxi Lu,Laiming Jiang,Benpeng Zhu,Rui Xiong
Stretchable and twistable sensors attract much attention due to their excellent flexibility, stability, and sensitivity for most wearable devices . Star nasal moles in nature possess a flexible and highly sensitive nose that is composed of dozens of epidermal appendages or rays densely covered with small organs, which provides us inspiration for fabricating highly sensitive sensors. Herein, we present a strategy to build a star-nose-inspired sensor with stretchable and twistable structure, where the nose’s ray-like parallel polyimide films were fabricated by electrospinning and chemical silver coating. The sensor is finally encapsulated in PDMS and its sensitivity is significantly improved due to the design of bio-inspired parallel films. The bio-inspired sensor finally exhibits ultra-light, ultra-thin, and high sensitivity (Gauge Factor (GF) ~ 4000) characteristics, ensuring a perfect fit for human skin to achieve stretch, twist, and pressure detection functions. At last, an anisotropic sensor for omnidirectionally sensing human motions was built by crosswise assembling two of functional layers. This study highlights interesting possibilities for bioinspired sensors, with integrated light, thin, stretchable, twistable, and anisotropic features for wearable devices for monitoring human movement and personal health.
研究领域:
生物医学工程
·
材料科学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 6
·2993-3008
·
IF 2.014
Chen Yuying,Chen Juan,Li Jianping,Jiang Jingzhe,Fang Ziang,Lin Xing,Jiang Yan,Zhang Hongwen,Liu Hongbo
In this study, a macroinitiator of β-CD-ONa was prepared by a substitution reaction of β-cyclodextrin (β-CD) with sodium (Na). The macroinitiator was then used in the ring-opening polymerization of octamethylcyclotetrasiloxane (D 4 ) to obtain a star polymer, in which β-CD is the core and polysiloxane is the arm. FTIR, NMR, TGA, CA, etc., were used to characterize the structure and properties of star polymers. The results indicated that there were four polysiloxane arms attached to each β-CD core, and the star polymer had good thermal stability. With the increase in D 4 monomer dosage, the hydrophobicity of the star polymer slightly improved, but the reaction time had no significant effect on hydrophobicity. When the star polymer was coated onto polyethylene terephthalate membrane, the transmittance increased from 87.6% to 92.8%, and the haze did not change significantly. Furthermore, the surface of star polymer porous membranes was prepared by the static breath-figure method using n -hexane as solvent at 30 °C. The results showed uniform pore distribution and increased hydrophobicity.
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 POLYMER ENGINEERING
·
2011
·Vol. 31
·期 1
·37-44
·
IF 0.493
Liehui Zhang,Ming Duan,Shenwen Fang,Peng Zhang,Jian Zhang,Fuxiao Wang
Star copolymers of acrylamide and N , N -dimethyl- N -vinylnonadecan-1-aminium chloride (C 18 DMAAC) were synthesized by photopolymerization in water. Solution behaviors of these star hydrophobically modified acrylamide copolymers (SHMPAMs) with different C 18 DMAAC contents and the linear hydrophobically modified acrylamide copolymers (LHMPAMs) were characterized. The increase in C 18 DMAAC content resulted in decreased intrinsic viscosity and increased the Huggins constant for SHMPAMs. Similar results were observed for LHMPAMs. With similar intrinsic viscosity and C 18 DMAAC content, the Huggins constant of SHMPAMs was much higher than that of LHMPAMs, which could be due to the fact that SHMPAMs had much stronger intramolecular interaction in dilute polymer solutions. In semi-dilute solutions, the apparent viscosity of SHMPAMs was increased with increasing C 18 DMAAC content, which was similar to that of LHMPAMs. However, SHMPAMs exhibited higher apparent viscosity than LHMPAMs because it had more arms and thus had more chances to form three-dimensional networks in semi-dilute solutions. In the flow-induced scission experiment, SHMPAMs exhibited superior shear stability in comparison with LHMPAMs. When the strain rate was ≈40,000 s-1, the reduction ratios of the apparent viscosities of the four SHMPAMs after the scission were approximately 80%. By contrast, when the strain rate was ≈20,000 s-1, the reduction ratio of the apparent viscosity of LHMPAM-0.40 had already reached around 80%.
研究领域:
高分子化学
·
物理化学
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产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2018
·
IF 4.432
Mingqi Wang,Xiaolong Zhang,Han Peng,Mingkui Zhang,Xianshuo Zhang,Zhe Liu,Liwei Ma,Hua Wei
The preparation of various types of miktoarm star polymers with precisely controlled structures (A2B, ABC, AB2C2, etc.) has made significant progress due to the considerable advances in the synthetic strategies, including multistep protections/deprotections, orthogonality, and integration of different polymerization techniques. However, compared to the well-developed synthesis methodologies, the investigations on miktoarm star copolymers as drug delivery vehicles remain relatively unexplored, especially for the relationship of their branched structures and properties as drug delivery systems. To elucidate this structure–property relationship of amphiphilic miktoarm star polymers, we prepared four different amphiphilic miktoarm star copolymers with the respectively identical molecular weights (MWs) of hydrophilic and hydrophobic moieties but different star structures using heteroinitiators that were synthesized by protection/deprotection strategies for integrated ring-opening polymerization of hydrophobic ε-caprolactone and atom transfer radical polymerization of hydrophilic oligo (ethylene glycol) monomethyl ether methacrylate (OEGMA). Further screening of an optimal formulation for anticancer drug delivery by the stability of micelles, in vitro drug loading capacity, drug release properties, cellular uptake efficacy, and cytotoxicity of doxorubicin (DOX)-loaded micelles showed that PCL3POEGMA1 micelles possessed the lowest critical micelle concentration, the highest drug loading content, and enhanced therapeutic efficiency for DOX release of all the synthesized four star copolymer constructs. This study thus provides preliminary guidelines and rationalities for the construction of amphiphilic miktoarm star polymers toward enhanced anticancer drug delivery.
研究领域:
高分子化学
·
药剂学
·
肿瘤治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2019
·
IF 3.078
Xiaodong Wang,Lu Bai,Shengwen Kong,Ying Song,Fanbao Meng
Series of novel star-shaped liquid crystals containing [1,1ʹ-biphenyl]-4,4ʹ-diyl diisonicotinate mesogens with various counterions (Br−, B-SO3−,C-SO3−,H2PO4−, BF4−) have been synthesized and characterized, which display a nematic phase. The molecular structures of the liquid crystals, thereof consisting of rod-like mesogens linked together by different long alkyl spacers to a small disc-like core of central benzene-1,3,5-triyl triisonicotinate, have been fully characterized by 1H NMR. Their thermal and supramolecular organization behaviours have been studied by combining polarized optical microscopy, differential scanning calorimetry and small-angle X-ray scattering. These investigations showed that the mesophase temperature range increased with increasing alkyl chain length and the clearing point decreased with increase of anion size. These star-shaped liquid crystals have a long and ordered molecular structure, the electron delocalization of the π-π stacking conjugation effect and the electrostatic attraction of ionic make them have good ferroelectric properties and ionic conductivity properties. The interest in preparing ionic liquid crystal with a nematic phase lies in the technological applications as it is well known that the nematic phase has the highest fluidity of all liquid crystalline phases and hence the possibility to align it by applying an external electric/magnetic field, commonly used in electro-optical devices.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Xue-Guo Liu,Xiao-Jing Xing,Zhi-Nong Gao
Efficient synthesis of four star-like triethanolamine based cationic trimeric surfactants T n (where n is the tail chain length, n = 10, 12, 14, and 16) with ester groups in spacers has been successfully achieved, where mild reaction conditions were employed by substituting triethylamine (TEA) with potassium carbonate as the acid binding agent. The physicochemical properties of these surfactants were investigated by means of surface tension, electrical conductivity, and steady-state fluorescence measurements. The trimeric surfactants have been found to be capable of adsorbing to the air/water interface and orienting themselves through the interactions among the hydrocarbon chains. The conductivity measurement revealed the formation of premicellar aggregations in the T 16 solution. It is noteworthy that the micropolarity of the surfactant aggregations decreased with the elongation of the hydrophobic chain length. Typically, dynamic light scattering and transmission electron microscopy studies showed that the aggregations of the four surfactants changed from larger ellipsoidal vesicles to smaller globule micelles with the increase of the surfactant concentration. It is assumed that this unusual aggregation behavior is related to the transformation of molecular conformation from stretched configuration to a pyramid-like shape.
研究领域:
化学
·
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2014
·Vol. 21
·期 4
·917-925
·
IF 1.836
Zheng Tao,Xing Qian,Ren Shitong,Zhang Liaoyun,Li Huayi
Hyperbranched poly(glycidol) containing hydroxyl groups was firstly synthesized via anionic polymerization and then reacted with 2-bromoisobutyl bromide to form macroinitiator HPG-Br. Finally, a hyperbranched star polymer (HPG-PPEGMA) was successfully prepared by atom transfer radical polymerization (ATRP) of poly(ethylene glycol) methyl ether methacrylate using HPG-Br as macroinitiator. The structures and properties of the obtained polymers were characterized by 1 H NMR, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The ionic conductivity of the polymer electrolytes composed of HPG-PPEGMA and lithium bis(trifluoromethanesulfonimide) (LiTFSI) was investigated via electrochemical impedance spectroscopy. The results showed that the room temperature ionic conductivity of the prepared hyperbranched star polymer electrolytes had a higher ionic conductivity. When [EO]/[Li] was 20, the ionic conductivity of the hyperbranched star polymer electrolyte was up to 1 × 10 −4 Scm −1 at 30 °C. The onset decomposition temperature of the hyperbranched star polyether could reach 374 °C, indicating that the hyperbranched star polymer had a good thermal stability. The XRD results showed that the structure of the hyperbranched star polymer was beneficial to improve the ionic conductivity due to possessing a low degree of crystallinity.
研究领域:
材料科学
·
电化学
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2010
·
IF 3.573
Jianbo Li,Jie Ren,Yang Cao,Weizhong Yuan
Biodegradable star-shaped poly( ɛ -caprolactone) and poly( ɛ -caprolactone- b - l -lactide) (5sPCL- b -PLLA) with five arms were synthesized by ring-opening polymerization (ROP) from an asymmetric BIS-TRIS core via “core-first” strategy. Subsequently, a series of amphiphilic and double responsive star-block copolymers were synthesized by Z -RAFT star polymerization of N , N -dimethylamino-2-ethyl methacrylate (DMAEMA) from the star-shaped macro-RAFT agent, which was prepared by attaching 3-benzylsulfanylthiocarbonylthiocarbonylsufanylpropionic acid (BSPA) to 5sPCL- b -PLLA using a simple two-step reaction sequence. GPC and 1 H NMR data demonstrated the polymerization courses are under control. The molecular weight of 5sPCL- b -PLLA- b -DMAEMA increased with the monomer conversion, and the molecular weight distribution was in the range of 1.19–1.37. The spherical micelles with degradable core and pH/thermo-double sensitive shell had been prepared from the aqueous medium of the amphiphilic star-shaped copolymers by dialysis method. Both pH and thermal-responsive behaviours of copolymer micelles obtained in this study were investigated. The micelle size and morphology were measured by DLS, AFM and TEM .
研究领域:
高分子化学
·
材料科学
·
纳米医学
✓ 已验证
DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2014
·Vol. 10
·期 8
·1627-1634
·
IF 7.578
Zhao Jing,Wang Yajing,Luan Libiao
The purpose of this work was to develop a novel picropodophyllin-loaded micelle-like nanoparticle with a biodegradable amphiphilic star-shaped polycaprolactone-polyethyleneglycol copolymer (S-PCL-PEG). S-PCL-PEG was synthesized using star-shaped polycaprolactone (S-PCL) as a hydrophobic
block and monomethoxy polyethyleneglycol (PEG) as a hydrophilic block and characterized by 1H-NMR. It was confirmed by the pyrene fluorescence probe method that the obtained S-PCL-PEG could form micelles through self-assembly in aqueous media. In addition, picropodophyllin (PPP),
a hydrophobic anticancer drug, could be entrapped in the hydrophobic inner core of the micelles using the thin film hydration method, forming PPP-loaded micelle-like nanoparticles (PPP-NPs). PPP-NPs had a high encapsulation efficiency of greater than 90%, an average size of 90–110 nm
with a symmetrical monodisperse distribution and a zeta potential of –18 mV. Additionally, in vitro release tests showed that approximately 70% of the drug was released from PPP-NPs into PBS (pH 7.4) containing 0.2% Tween 80 at 37 °C for 96 h, and the drug release data fit
well to the Higuchi equation. Furthermore, an in vitro tumor cell growth inhibition assay showed that the IC50 values of the PPP solution and PPP-NPs against SMMC7721 liver cancer cell lines were 0.4 μg/ml and 0.2 μg/ml respectively, which indicated that
the cytotoxicity of PPP-NPs against tumor cells was greater than that of the PPP solution. In conclusion, S-PCL-PEG micelle-like nanoparticles loaded with PPP have a promising future for administration by injection.
研究领域:
药剂学
·
生物材料
·
肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
Biomimetics
·
2025
·Vol. 10
·期 6
·368
·
IF 3.9
Lei Feng,Liugen Xu,Junhao Wen,Minghai Zhao,Amjad Ali,Naushad Ahmad,Jianwei Lu,Li Guo
Developing safe and efficient cryoprotectants is critical for effective cryopreservation in biomedical applications. Inspired by natural antifreeze proteins (AFPs), a series of linear and star-shaped peptoids featuring isopropanol side chains to mimic the amphiphilic characteristics of threonine were prepared. The effects of chain length and molecular topology on antifreeze properties were systematically investigated. Both ice recrystallization inhibition (IRI) and ice crystal growth suppression improved with increasing chain length, and star-shaped peptoids exhibited superior performance. Notably, the star-shaped peptoid S-(A6)3demonstrated excellent antifreeze activity and low cytotoxicity, highlighting its promise as a novel, non-toxic alternative to conventional cryoprotectants like DMSO. These findings provide valuable insight into the structure-property relationship of peptoids for cryopreservation applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2024
·
IF 6.1
Bingyao Jiang,Jia Yang,Xingyu Zhong,Shuo Yan,Meizhen Yin,Jie Shen,Bin Lei,Zhaohu Li,Yuyi Zhou,Liusheng Duan
Plant Growth Regulators (PGRs) are functional compounds known for enhancing plant growth and development. However, their environmental impact is a concern due to poor water solubility and the need for substantial organic solvents. Recently, nano-delivery systems have emerged as a solution, offering a broad range of applications for small molecule compounds. This study introduces a nano-delivery system for Triacontanol (TA), utilizing a star polymer (SPc), aimed at promoting maize growth and improving physiological indicators. The system forms nearly spherical nanoparticles through TA's hydroxyl group and SPc's tertiary amine group. The TA/SPc nano-complex notably outperforms separate TA or SPc treatments in maize, increasing biomass, chlorophyll content, and nutrient absorption. It elevates chlorophyll content by 16.4%, 10.0%, and 6.2% over water, TA, and SPc treatments, respectively, and boosts potassium and nitrate ion uptake by up to 2 and 1.6 times compared to TA alone, leading to enhanced plant height and leaf growth. qRT-PCR analysis further demonstrated that the nano-complex enhanced cellular uptake through the endocytosis pathway by up-regulating endocytosis-related gene expression. The employment of TEM to observe vesicle formation during the internalization of maize leaves furnishes corroborative evidence for the participation of the endocytosis pathway in this process. This research confirms that SPc is an effective carrier for TA, significantly enhancing biological activity and reducing TA dosage requirements.
研究领域:
农业科学
·
纳米技术
·
植物生理学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Qi Lun,Tu Dan,Shi Yu,Liu Jingjing,Zhao Xinyuan,Xu Jianhua,Yang Yajie,Yang Wenyao
Zeolitic imidazolate frameworks (ZIFs) have greatly attracted attention in supercapacitors research due to their porosity and structural controllability. In this paper, a series of Co–nitrogen carbon (Co–NCs) were obtained via a facile one-step calcination process using 3D star-shaped Co–ZIF as a precursor. The energy storage mechanism is analyzed and it is concluded that Co–NCs show excellent capacitance and cycling stability, attributed to its star-shaped porous morphology and high pseudocapacitance contribution. The optimized Co–NCs/550 exhibits a specific capacity of 825 F g −1 at a current density of 0.1 A g −1 , and a highly stable cycling performance over 5000 cycles at a current density of 2 A g −1 . This work provides a practical strategy for designing stable electrode for high-performance supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 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）