Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Le Liu,Tuanwei Li,Zheng Ruan,Pan Yuan,Lifeng Yan
A heavy atoms modified reaction-active photosensitizer NHS-BODIPY-Br possessing efficient near infrared (NIR) fluorescence emission and singlet oxygen generation properties has been synthesized, which can be used for synchronous NIR imaging and photodynamic therapy (PDT). A reduction-sensitive PEGylated polypeptide nanogel was prepared by ring-opening polymerization (ROP) of l -cystine- N -carboxy anhydride. Poly (ethylene glycol) methyl ether was used as initiator and hydrophilic segment, the as-prepared nanogel was conjugated with the NHS-BODIPY-Br molecule by chemical linkage, and it can be directly used as a macrophotosentizer for NIR imaging-guided PDT. In addition, the nanogel also showed good encapsulating ability for doxorubicin (DOX). In the presence of glutathione (10 mM), the obtained NIR nanogel showed obvious reduction-induced drug release behavior. In vitro tests on internalization of the NIR nanogel by HepG2 cells indicated its efficiency in detecting cancer cells. Meanwhile, MTT assays performed on HepG2 cells confirmed that the cancer cells growth could be obviously suppressed (almost all cells) when exposed to an extremely low energy light (25 mW/cm 2 , 10–15 J/cm 2 ) and low dose of DOX (3–5 μg/ml), indicates an efficient NIR image-guided chem/photodynamic therapy.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Weiying Zhou,Fuwang Mo,Zishan Sun,Jiabao Luo,Jiaqi Fan,Hongni Zhu,Zhenpeng Zhu,Jinqing Huang,Xinguo Zhang
Carbon dots (CDs) with long-wavelength-emission and high quantum yield (QY) are the focus of current research, compared with widely-investigated blue-emitting CDs. Herein, bright red-emitting CDs were synthesized by hydrothermal reaction at 200 °C for 3 h. CDs prepared by p-Phenylenediamine (pPD) exhibits a weak red band at 635 nm under an excitation wavelength of 450 nm. Adding (NH 4 ) 2 HPO 4 and KBr as P and Br precursors, the red emission peak at 610 nm, which shows a peak blue-shift about 25 nm with a dramatic emission enhancement up to 20-folds by co-doping of P, Br atoms into CDs. The corresponding QY value of P, Br-doped CDs (P, Br-CDs) was greatly improved to 11.3% as compared to bare CDs’ (0.55%). Furthermore, P, Br-CDs show a remarkable luminescent turn-off response after adding copper ions (Cu 2+ ). In addition, the quenched luminescence of P, Br-CDs/Cu 2+ complex could be recovered by the chelation between Cu 2+ and L -cysteine ( L -Cys) after adding L -Cys. This fluorescence “ON-OFF-ON” protocol could be applied for sequent Cu 2+ and L -Cys detection, and offer a linear range of 0–150 μM and 0–100 μM with a limit of detection of 4.408 µM and 2.373 µM for Cu 2+ and L -Cys, respectively. All results indicate that P, Br-CDs are of great potential for further biological and environmental application.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wenjuan Zhang,Lei Shi,Dongfang Niu,Heng Xu,Xinsheng Zhang,Shuozhen Hu
The effect of methoxypolyethylene glycol (mPEG) on chromium electrodeposition from a mixture of 1- butyl-3-methylimidazolium-bromide ([BMIM]Br) ionic liquid and water is studied. The addition of mPEG does not affect the two-step reduction process of Cr(III). With the presence of mPEG in the electrolyte, the diffusion coefficient decreases dramatically, and the resistance of the electrolyte and charge transfer increase, resulting in a reduced deposition rate and a smooth and crack-free coating surface. The hydrogen evolution reaction is suppressed, and more metallic Cr is deposited in the coating layer. Considering both the surface morphology and corrosion resistance, 80 mmol L -1 mPEG is the optimum concentration for smooth and pinhole-free chromium electrodeposition in the mixture of [BMIM]Br ionic liquid and water.
研究领域:
电化学
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材料科学
·
表面工程
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yimin Hu,Jing Sun,Zixian Cai,Meiling Lei,Yu Chen,Shaoan Lei,Huijiao Cao,Xia Guo
The formation of long cylindrical wormlike micelles at low temperatures (near 0 °C) is relatively rare. In this work, the effect of different salts on the viscoelasticity of the formed wormlike micelles by the ionic liquid surfactant (1-octadecyl-3-nonyl imidazolium bromide, [C18imC9]Br) and glycerol/1,2-propanediol mixture at low temperature was studied. The rheological measurements revealed that only sodium salicylate (NaSal) can increase the viscoelasticity of [C18imC9]Br wormlike micelles by up to 15 times and the existence of temperature range. When the [C18imC9]Br concentration is fixed, the viscoelasticity of the [C18imC9]Br/NaSal wormlike micelles increases and then decreases with the increase of NaSal concentration. Tribological results show that the [C18imC9]Br/NaSal wormlike micelles have excellent friction reduction and antiwear properties for steel/steel contact at 6.00 °C. The friction coefficient and wear volume of [C18imC9]Br/NaSal wormlike micelles first decrease and then increase with the increase of the NaSal concentration. In addition, their tribological properties are significantly better than those of pure [C18imC9]Br wormlike micelles under the same conditions. The lubrication effect of [C18imC9]Br/NaSal wormlike micelles at low temperatures is improved due to the adhesion of [C18imC9]Br/NaSal wormlike micelles and the protective film formed by the tribochemical reaction.
研究领域:
材料科学
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化学工程
·
摩擦学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yanmei Zhou,Shaoru Wu,Guobin Huang,Jingbin Zeng,Benjamin Edem Meteku,Xiaohong Tan,Heng Lu,Feiming Li,Zhixiong Cai,Xudong Wang,Maosheng Zhang
Intrinsic and surface defects are the crucial factors that affect the stability and luminescence efficiency of nanocrystals (NCs). Ion-doping and surface passivation are considered as the most effective strategies to suppress the intrinsic and surface defects of NCs, respectively. Herein, an efficient and facile double passivation process, simultaneously realizes ion-doping and surface passivation, for Cs 3 Cu 2 X 5 (X Cl, Br and I) NCs is developed by using potassium oleate (K-OA) as passivator. K ion is used as ion-doping passivation and OA ion is used as the organic ligand for surface passivation of NCs. Compared to the free passivated NCs, the Photoluminescence quantum yield (PLQYs) of dual-passivated Cs 3 Cu 2 X 5 (X Cl, Br and I) NCs increase significantly from 2.87%, 11.6% and 49.4–31%, 69.9%, and 97.2%, respectively. Moreover, the stability of proposed NCs is greatly improved (Cs 3 Cu 2 Cl 5 NCs maintain 63% of PL efficiency after 100 h, Cs 3 Cu 2 Br 5 and Cs 3 Cu 2 I 5 NCs maintain 65% and 97% of PL efficiency after 100 days, respectively) at 50–86% relative humidity and room temperature under ambient atmosphere.
研究领域:
材料科学
·
光学
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 6
·1006
·
IF 5.1
Yiting He,Xiayu Zhu,Ajun Li,Shuyuan Lin,Bo Li,Songbin Liu,Xinyu Ye
CsPbBr3perovskite quantum dots (QDs) have attracted significant attention for optoelectronic applications owing to their outstanding optical properties, yet achieving controlled synthesis with high stability under mild conditions remains a challenge. The room-temperature synthesis of CsPbBr3perovskite quantum dots using a coprecipitation method is systematically investigated in this work, with an emphasis on how the structural and optical properties of the QDs are influenced by the Br/Pb ratio and OA/OAm ratio. The findings show that controlling the Br/Pb and OA/OAm ratios can effectively influence the size, crystalline phase, and surface passivation properties of CsPbBr3quantum dots. The photoluminescence peak shifts blue and the bandgap widens when the Br/Pb ratio rises due to a decrease in quantum dot size. This is mainly explained by more effective surface covering by Br−ions and increased quantum confinement effects. The resultant quantum dots demonstrate ideal optical performance at a Br/Pb ratio of 75 and an OA/OAm ratio of 1.5, with dense ligand coverage, superior defect passivation, and markedly improved stability under UV irradiation and in aqueous environments. Variations in the Br/Pb and OA/OAm ratios affect the binding configuration and coverage of ligands on the quantum dot surface, thereby influencing the relationship between non-radiative recombination and the quantum confinement effect. The LED fabricated with the as-synthesized high-performance quantum dots demonstrates a wide color gamut, covering 129.45% of the NTSC standard, indicating strong potential for display applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Huanfeng He,Xin Li,Muhammad Fahim,Sai Liu,Irum Firdous,Tsz Chung Ho,Chi Yan Tso
Systematic Br/Cl doping in 2D perovskite TMPI establishes a detailed composition-property database. • Optimal Cl doping (I: Cl = 4:1) enhances solar modulation ability ( Δτsol ) to 27.7%. • Br doping effectively reduces the transition temperature of 2D perovskite to near 40 °C for practical use. • First-principles calculations reveal that water adsorption energy governs transition properties. Buildings account for a large portion of global energy consumption, driving the need for smart windows that can dynamically regulate solar heat. Two-dimensional (2D) thermochromic perovskites offer promising stability, but their practical application is limited by high transition temperatures and modest solar modulation ability. Here, we employ halide engineering via systematic Br/Cl doping in the 2D perovskite Tha 2 MAPbI 4 (TMPI) to optimize these key properties. A systematic Br/Cl doping was conducted in TMPI and established a detailed composition-property database. It is found that optimal Cl doping (I: Cl = 4:1) enhances the solar modulation ability ( Δτ sol ) to 27.7%, while Br doping effectively lowers the transition temperature to near 40 °C. Most importantly, a High-Resolution Transmission Electron Microscope (HRTEM) was employed to characterize the crystallization of 2D perovskites with different halogen dopants, providing the first atomic-scale observation of lattice fringes and SAED patterns in thermochromic metal halide perovskites and revealing the doping-dependent crystallinity evolution. Moreover, first-principles calculations reveal that enhanced water adsorption energy on doped perovskite surfaces governs the reduced transition temperature and faster response kinetics. A real-world model house demonstration confirms the superior cooling performance of the optimized smart window. This work provides not only high-performance material candidates but also a fundamental mechanistic framework for developing energy-efficient, responsive smart windows.
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高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xiu-Ni Hua,Zhuoer Cai,Xian Shi,Yuna Duan,Xiang Zhang,Jian Chen,Hai-Bao Duan
Significant attention has been dovoted to the organic–inorganic hybrid perovskites in the realm of scientific research arising from their distinctive optical and dielectric properties along with structural tunability, rendering them highly versatile and adaptable materials. Herein, two novel one-dimensional organic–inorganic hybrid perovskites of (4-MPD)MnX3 (4-MPD = 4-methylpiperidinium, X = Cl (1), X = Br (2)) were synthesized and demonstrated to, respectively, undergo reversible phase transitions at 376 and 368 K, characterized by differential scanning calorimetry and dielectric measurements. It is instresting to note that the replacement of Br by the Cl halogen atom has maintained the crsytal structures but devoted a slight increase in phase transition temperature. Variable-temperature structural analyses signify that the order–disorder change of 4-MPD cations acts as the driving force for such phase transitions from the Pnma to P1̅ space group. In addition, compounds 1 and 2 both emit strong red photoluminescence under UV excitation. The two compounds with high-temperature dielectric switching and photoluminescent properties will offer fresh insights for the design and investigation of novel multifunctional organic–inorganic hybrid perovskites.
研究领域:
材料科学
·
无机化学
·
光电子学
·
介电材料
·
钙钛矿研究
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高影响因子
Carbon Energy
·
2026
·
IF 21.4
Pubao Peng,Yang Geng,Jiajun Nan,Song Li,Dewei Zhang,Qing Lin,Yaru Gong,Guodong Tang
Polycrystalline SnSe has attracted significant attention due to its facile processing, machinability, and scale-up application. However, n-type polycrystalline SnSe consistently exhibits inferior thermoelectric performance compared to p-type polycrystalline, because SnSe is an intrinsic p-type semiconductor. Here, we promoted the thermoelectric performance of n-type polycrystalline SnSe through manipulating the band structure and dislocations. The band convergence and enhanced density of states in the electronic structure of SnSe promoted by Pb/Ge/Br codoping, lead to significant enhanced Seebeck coefficient. The carrier concentration was simultaneously enhanced through Ge/Pb/Br codoping. The combination of a large Seebeck coefficient and the enhanced electrical conductivity gives rise to a high power factor as high as 7.47 μW cm −1 K −2 at 873 K. Furthermore, we found that dopants induce strong atomic strain disturbance in the SnSe matrix because of large differences in atom radius with host elements, leading to the formation of high-density dislocations. The presence of dislocations and nanoprecipitates forms strong phonon scattering centers, effectively scattering phonons and suppressing lattice thermal conductivity. As a result, a high peak ZT of 1.6 has been obtained in n-type Sn 1.04 Ge 0.02 Pb 0.02 Se 0.97 Br 0.03 .
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yanchun Yang,Song Wei,Xiaojiao Kang,O. Tegus,Daocheng Pan
Employing the short-chain C 4 H 9 NH 3 X (X = Cl, Br, I) compound as the unique capping agent, highly quality CH 3 NH 3 PbX 3 (X = Cl, Br, I) perovskite quantum dots can be synthesized at room temperature in the open air, which possess high photoluminescence quantum yields and tunable emission in the range of 440–660 nm. Besides, C 4 H 9 NH 3 Br can also improve the morphology of CH 3 NH 3 PbBr 3 thin films by spin-coating the N, N -dimerthylformamide solution of CH 3 NH 3 Br, C 4 H 9 NH 3 Br and PbBr 2 , making the thin film dense and compact, and improving its optical properties .
研究领域:
材料科学
·
纳米科技
·
光电功能材料
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半导体物理
·
凝聚态物理
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jingxuan Yang,Dongxu Qu,Jue Wang,Yangtao Wu,Lingjun Bu,Yuanxi Huang,Shiqing Zhou
The N-Br bond in monobromoamine (NH 2 Br) can be cleaved by UV irradiation to generate Br • and subsequently HO • , resulting in an advanced oxidation condition (i.e., UV/NH 2 Br). This study investigated the degradation of six contaminants of emerging concern (CECs) in the UV/NH 2 Br process, including the phenolic hydrocarbons phenol and bisphenol A (BPA), the amines aniline and sulfadiazine (SDZ), and the persistent organic pollutants ibuprofen (IBP) and carbamazepine (CBZ). The results showed that UV/NH 2 Br process significantly improved the degradation of CECs following pseudo-first order kinetics, and the degradation of CECs was enhanced with the increase of NH 2 Br dosage. UV/NH 2 Br was more efficient in degrading CECs containing phenolic hydroxyl groups (100 %), followed by those containing amine groups (> 95 %). The degradation efficiency was influenced by the pH value and was highest at pH 7. It was found that low concentrations of Cl − (< 0.5 mM ) and HCO 3 − (< 0.5 mM) promoted the degradation of SDZ and IBP, but further increases in Cl − and HCO 3 − (0.5 ∼ 5.0 mM) resulted in inhibition. SDZ and IBP degradation was inhibited by photo absorption competition and free radical depletion in natural organic matter and actual water. Probe experiments showed that reactive bromine species (RBS), reactive nitrogen species (RNS), and hydroxyl radical (HO • ) played a dominant role in CEC degradation. During the degradation of IBP by UV/NH 2 Br, hydroxylation, bromination , and quinylation were proposed as the primary reaction mechanisms. As compared to HOCl disinfection, NH 2 Cl disinfection after the UV/NH 2 Br process produced lower concentrations of disinfection by-products (DBPs).
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高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Qian Wu,Le Tong,Zhiru Zou,Yingqiao Li,Jinyu An,Wenwen Shen,Yu Gao,Ying Liu,Chao Wu
The objective of this study was to prepare Herceptin-functionalized SK-BR-3 cell membrane-wrapped paclitaxel nanocrystals (HCNCs) as a targeted delivery module for HER2-positive breast cancer. According to transmission electron microscopy (TEM) images, HCNCs presented a membrane-coated cubic shape with a particle size of approximately 220 nm. In vitro release test suggested that HCNCs had a certain sustained release effect of paclitaxel (PTX). Cell uptake experiments, in vivo imaging, and tissue distribution experiments demonstrated that HCNCs had excellent targeting ability to homologous tumor cells (SK-BR-3). The results of MTT, flow cytometry, Western blot, cell immunofluorescence staining, and in vivo antitumor experiments proved that HCNCs had a more significant ability to promote HER2-positive breast cancer cell apoptosis and inhibit its proliferation. These results clearly concluded that HCNCs were a promising nano-targeted preparation in anti-HER2-positive breast cancer.
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