APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Minghui Zan,Shuai An,Lei Cao,Yulu Liu,Li Li,Mingfeng Ge,Pai Liu,Zaihui Wu,Wen-Fei Dong,Qian Mei
Progesterone (P4) is an important steroid hormone that act as an indicator in the female reproductive processes; thus, following its concentration levels in human serum is important for diagnosis of early pregnancy. In this work, carbon dots (CDs) were designed via a dry-heating method, and the novel CDs exhibited good dispersion stability and excellent photostability. Under optimal conditions, the as-prepared CDs displayed high selectivity and sensitivity for P4 and exhibited a fast-responsive (within 1 min) fluorescence intensity enhancement signal in aqueous solution. For further application, the fluorescence sensing system was further extended to monitoring progesterone in real samples with acceptable recoveries. The methodology developed here offers a promising direction for the detection of clinical biomarkers that are closely related to human health.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
高影响因子
Soft Matter
·
2018
·Vol. 14
·期 28
·5888-5897
·
IF 3.709
Si Yu Zheng,Ye Tian,Xin Ning Zhang,Miao Du,Yihu Song,Zi Liang Wu,Qiang Zheng
Hydrogel films have promising applications in medical dressings, flexible electronics, etc. However, it is challenging to fabricate ultrathin hydrogel films with high toughness and controllable thickness. Here, we report a facile approach to prepare tough physical hydrogel films by spin-coating of a poly(acrylic acid-co-acrylamide) (P(AAc-co-AAm)) solution and subsequent gelation in FeCl3 solution to form carboxyl–Fe3+ coordination complexes. The thickness of the obtained gel films, ranging from several to hundreds of micrometers, was easily tunable by adjusting the spin conditions and polymer concentration. The thus obtained hydrogel films showed excellent mechanical properties, with tensile breaking strengths of 0.6–14.5 MPa, breaking strains of 140–840%, Young's moduli of 0.1–61.7 MPa, and tearing fracture energies of 300–1300 J m−2. Based on this approach, responsive tough hydrogel films can also be prepared by spin-coating of a poly(acrylic acid-co-N-isopropylacrylamide) (P(AAc-co-NIPAm)) solution. The obtained gel films showed a fast response (<60 s) and a large output force (∼0.2 MPa) triggered by a concentrated saline solution, making them an ideal material in the design of chemomechanical devices. Furthermore, a bilayer hydrogel film was fabricated by two-step spin-coating of P(AAc-co-NIPAm) and P(AAc-co-AAm) solutions, which showed reversible bending deformation under external stimuli. This simple yet effective approach should be applicable to other systems to prepare versatile hydrogel films with tunable thickness and promising applications in diverse areas.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 1
·390-395
·
IF 2.936
Xianwei Fu,Shilong Jiao,Ning Dong,Gang Lian,Tianyu Zhao,Song Lv,Qilong Wang,Deliang Cui
A room-temperature NO2 gas sensor with excellent performances is fabricated using an MAPbI3 (MA = CH3NH3+) thin film. It presents a high response even under extremely low NO2 concentrations. Its average response and recovery times are only ∼5 s and ∼25 s at room temperature, respectively, exhibiting its quick-responsive character. In addition, the MAPbI3-based NO2 sensor exhibits good selectivity. Interestingly, the sensitivity of the MAPbI3-based NO2 sensor is strikingly improved under high-pressure gas conditions. This phenomenon can be used for the online monitoring of chemical reaction processes and in situ detection of trace-level gas impurities under high-pressure conditions. Furthermore, based on theoretical calculations, a simple model is proposed to illustrate the corresponding gas-sensing mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2013
·Vol. 13
·期 3
·2136-2146
·
IF 1.149
Chen Yi,Xu Weijian,Xiong Yuanqin,Peng Chang,Liu Wenyong,Zeng Guangsheng,Peng Yue
The preparation of a novel fast response thremosensitive hydrogel was investigated by incorporating nanosized octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) particles into inorganic clay-crosslinked poly(N-isopropylacrylamide) (PNIPA) nanocomposites hydrogels (NC gels).
The resulting hydrogels named as P-NC gels involving both the strategies of NC gels and double network gels (DN gels) were successfully synthesized via a two-step technique. The second PNIPA network crosslinked by OvPOSS were polymerized in the presence of the first clay-PNIPA network. The
P-NC gels were characterized by FTIR, X-ray, DSC, UV/vis spectra, SEM, mechanical properties and swelling behaviors measurements. The key factor for preparing homogenous P-NC gels with good transparency was the low concentration of OvPOSS (c
OvPOSS) dispersed uniformly in
polymer as a cross-linker. On the contrary, the high c
OvPOSS led to the significant aggregation of the OvPOSS particles and thus resulted in the heterogeneity of gels. The SEM images of freezedried P-NC gels exhibited a highly interconnected microporous network structure,
which could be adjusted by varying the amount of OvPOSS. The special porous morphology brought about an attractive faster swelling/deswelling rate than that of normal NC gels. All properties of P-NC gels displayed an obvious dependence on the concentration of incorporated OvPOSS. The excellent
mechanical properties, tunable LCST, especially the fast deswelling rate make these hydrogels potential candidates for applications in drug release and other biological fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lin Guan,Yongqi Yang,Fei Jia,Guanghui Gao
Photochromic hydrogels have attracted considerable attention owing to their potential application in optical devices. However, the weak mechanical properties severely limited their applications. Here, a novel photochromic hydrogel with high transparency, high stretchability and rapid photochromic responsiveness has been successfully designed and prepared by introducing a redox photochromic material (Mo) into the hybrid hydrogel. The photochromic hydrogel with rapid photochromic response achieved discoloration process within only 3 s and the fading process could be easily performed under the air environment. Moreover, the ability to rewrite and erase optical information have been implemented on the photochromic hydrogels. Therefore, this strategy of photochromic hydrogel would contribute to design a new generation of optical display devices.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hui Shang,Xiaoxia Le,Muqing Si,Shuangshuang Wu,Yu Peng,Fuqing Shan,Si Wu,Tao Chen
Current hydrogel-based actuators have achieved rapid development due to their excellent performance such as shape-morphing and color-changing for application in fields such as camouflage, biomimetic soft-robotics and so on. However, it is still challenging to fabricate soft robots with the capability of simultaneous changes in shape and fluorescent color at a fast speed when triggered by one single stimulus. Herein, an anisotropic organohydogel actuator made up of rGO-doped hydrophilic poly(N-isopropylacrylamide) (PNIPAM) network and hydrophobic poly(lauryl methacrylate) (PLMA) network is prepared via a two-step interpenetrating method. Bearing fluorescent monomer N-(4-(1,2,2-triphenylvinyl)phenyl)acrylamide (ATPE) as well as fluorescent ligand 6-acrylamidopicolinic acid (6APA), the PLMA network shows fluorescent changes in color or brightness depending on the presence or absence of Eu 3+ ions in response to heat/NIR. In a word, the proposed organohydrogel actuator, which exhibits simultaneous fluorescence color variation and fast morphing in response to one stimulus, provides insights in designing and fabricating novel soft robots.
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
SENSORS
·
2022
·Vol. 23
·期 1
·148
·
IF 3.847
Ji Zhang,Xu Li,Qinhe Pan,Tong Liu,Qingji Wang
Hydrogen (H2) has gradually become a substitute for traditional energy, but its potential danger cannot be ignored. In this study, litchi-like g-C3N4/In2O3composites were synthesized by a hydrothermal method and used to develop H2sensors. The morphology characteristics and chemical composition of the samples were characterized to analyze the gas-sensing properties. Meanwhile, a series of sensors were tested to evaluate the gas-sensing performance. Among these sensors, the sensor based on the 3 wt% g-C3N4/In2O3(the mass ratio of g-C3N4to In2O3is 3:100) showeds good response properties to H2, exhibiting fast response/recovery time and excellent selectivity to H2. The improvement in the gas-sensing performance may be related to the special morphology, the oxygen state and the g-C3N4/In2O3heterojunction. To sum up, a sensor based on 3 wt% g-C3N4/In2O3exhibits preeminent performance for H2with high sensitivity, fast response, and excellent selectivity.Keywords:g-C3N4/In2O3;litchi-like;H2sensor;fast response;high selectivity
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuting Tian,Weining Liu,Jun Hu,Zhiwei Li,Xiaoying Xin,Guodong Fu
The persistent global high-temperature weather warns us that improving energy efficiency and reducing CO 2 emissions are urgent. Controlling the solar energy input in buildings using photochromic smart coating can effectively reduce the energy consumption required for cooling. However, it remains a challenge to achieve high transparency and fast photoresponse in organic–inorganic hybrid photochromic smart coating. Herein, we utilize space-limited domains to design a template polymer that facilitates the formation of amorphous WO 3 nanodots, thereby enhancing the polymer network structure through hydrogen bonding and dipole–dipole interactions, which endow the smart coating with excellent adhesion strength up to 13 MPa. Notably, the photochromic smart coating with amorphous WO 3 nanodots exhibits higher transparency (96.8 %) than conventional glass (91 %), and a wide visible light modulation range of 96.8 %-4.8 %. Based on this, the cooling efficacy of the smart photochromic coating was assessed within a model residence under actual environmental conditions. The inner temperature of the model house was reduced by up to 13 °C, which decreased indoor heat absorption by 25.8 %, significantly improving energy efficiency. This work provides an important and attractive strategy for achieving energy-efficient building materials and addressing global climate warming.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 16
·5934-5940
·
IF 5.7
Tianyu Wang,Shuwen Xin,Yaoyu Liu,Zongshuai Ji,Guanfeng Liu,Shuai Zhang,Tianhua Wang,Fengyun Wang,Bing Teng,Shaohua Ji
Metal halide perovskites are extensively utilized in photoluminescence and photoelectric detection, owing to their modifiable band gap, elevated quantum yield, high absorption coefficient, superior charge transport properties, versatile chemical synthesis, and cost-effective manufacturing. Among the perovskite variants, bismuth–halide perovskites have emerged as a promising lead–halide alternative, garnering increasing interest for crafting non-toxic perovskites in optoelectronic applications. Nonetheless, the rapid and straightforward production of high-quality single crystals remains a challenge. This paper introduces an enhanced antisolvent crystallization method for fabricating high-quality Cs3Bi2Br9 single crystals measuring 3 × 3 mm. These crystals exhibit a remarkably low half-peak width of the X-ray diffraction swing curve at just 0.048°, maintaining stability without phase decomposition for 180 days at room temperature under air exposure. The photodetector constructed involves an aluminum electrode deposited onto the crystal surface. Utilizing 375 nm ultraviolet light as the excitation source, the device demonstrates a swift electrical response (sensitivity: 8.41 × 102), achieving the rise and decay times of the Cs3Bi2Br9 single crystal detector of 96 and 80 milliseconds, respectively. This research holds significant promise for advancing perovskite crystal preparation and photodetection techniques, particularly in the realm of bismuth-based perovskites.
研究领域:
材料科学
·
光电技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 28
·7619-7625
·
IF 5.976
Yongqi Yang,Lin Guan,Haicheng Jiang,Lijie Duan,Guanghui Gao
Ink-free printing based on photochromism has attracted great attention as a new generation of printing technology. However, the current photochromic materials are limited due to slow response and high cost. In this investigation, a rapidly responsive photochromic hydrogel with high mechanical strength was explored through the introduction of cheap ammonium molybdate into gelatin and hydrophobic associative polyacrylamide. The photochromic hydrogel exhibited excellent mechanical strength of 750 kPa and a rapidly responsive photochromic process of 5 seconds with UV light irradiation. Moreover, the hydrogel could withstand long elongation and high compressive stress with shape recovery ability. The rapid photochromic properties gave hydrogels with fast and easy “printing” performance. More importantly, the “printed” text or pattern in hydrogels could be erased at 70 °C in an oxygen environment. In addition, the hydrogel could be written on in characters by using reducing reagents. Photochromic hydrogels with ink-free printing ability would demonstrate a new design strategy for soft materials with low-cost, rapid response and high mechanical properties.
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 COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yiqun Zhang,Jihao Bai,Linsheng Zhou,Deye Liu,Fengmin Liu,Xishuang Liang,Yuan Gao,Fangmeng Liu,Xu Yan,Geyu Lu
Hedgehog-like titanium dioxide (TiO 2 ) architectures composed of hundreds of one-dimensional (1D) nanorods and silver (Ag) loaded TiO 2 with different amounts (0.2 at%, 0.5 at% and 1 at%) were successfully prepared by facile hydrothermal process and simple isometric impregnation route. The high electron mobility of 1D nanorods on the surface of TiO 2 and the high porosity of Ag loaded hedgehog-like TiO 2 architectures enable the sensor with fast responsive and recovered properties. TiO 2 loaded with 0.5 at% Ag exhibited the highest response to xylene with low response/recovery time at the operating temperature of 375 °C. In addition, the sensitivity and selectivity of the TiO 2 sensor were enhanced markedly with Ag loading.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Feng Zhang,Dazhao Wang,Guanxin Du,Hongwei Li,Dianhao Hou,Yankun Qi,Shichao Lv,Shifeng Zhou
The scintillating photonic glass has the great potential for medicine imaging, nuclear physics, high-energy physics, and national defense. However, the development of the candidate with the high density remains a significant challenge. Herein, the superdense scintillating glasses derived from the Ce 3+ -activated Lu 2 O 3 -SiO 2 binary system were successfully fabricated by the strategy of contactless aerodynamic levitation heating under the N 2 atmosphere. These glasses are colorless, optical homogeneous, and exhibit superdense density from 6.59 to 7.15 g/cm 3 , representing the highest density among the fast decay glass systems. The materials present excellent radiation-blocking ability, suitable emission wavelength, and fast response, indicating the promise for fast-event X-ray detection. The micro radiation probe was fabricated by connecting the scintillating glass and the optical fiber. The practical application in remote radiation detection is demonstrated and it exhibits excellent linear response and high signal-to-noise ratio. The results confirm that the fabricated superdense scintillating glass is promising for application in the field of high-energy radiation detection.
研究领域:
材料科学
·
核物理学
·
医学成像
·
光学工程
✓ 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）