COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jiyao Xu,Lili Sun,Xiangjun Guo,Hongmei Zhang,Xihui Zhao
Green, blue and pink fluorescent carbon dots (o/m/p-CDs) were prepared by one-step hydrothermal method with three isomers (o/m/p) of phenylenediamine as nitrogen and carbon sources and ethanol as solvent. The obtained carbon dots exhibited different luminescence behaviors, and the luminescence behaviors were affected by solvent and pH. More interestingly, m-CDs exhibited obvious discoloration behavior under different pH conditions and had excellent linear relationship under acidic and basic conditions, respectively. Furthermore, we combined m-CDs with test paper, PVA film, and cotton fabric, respectively, to prepare composites for visual pH detection. The as-prepared composite material has excellent visual detection effect for a small amount of test sample (<5 μL) in the fine pH range (0.5 unit), and could be applied to trace pH detection.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Tianyi Zhang,Si Dong,Feifei Zhao,Mingxiao Deng,Yuqin Fu,Changli Lü
Recently, fluorescent pH test paper has been extensively explored for visual assays due to its easy preparation, low-cost, and portable feature. In addition, intracellular pH also plays important roles in different pathological and physiological processes for understanding cellular functions and providing critical assistance for early disease diagnosis. Herein, the tricolor emission [email protected] carbon dots (CDs) were synthesized via one-pot hydrothermal method using 5-amino-1,10-phenanthroline (Aphen) and citric acid (CA) as the carbon sources. The fluorescence emission of CDs showed an interesting pH dependence due to the special structure and properties, which can make the CDs to be used as the pH test paper to qualitatively and quantitatively detect pH value in a wide pH range. At the same time, because of good cell compatibility and low toxicity, CDs can be used as a new type of cell imaging marker to detect intracellular pH. The unique tricolor emission property of CDs can well avoid the fluorescent dyes and protein fluorescence interference.
研究领域:
材料科学
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分析化学
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生物医学工程
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细胞生物学
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产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Jianxin Zhang,Yao Gu,Jianzhong Jiang,Raojun Zheng
Herein, we report pH-responsive liquid marbles stabilized by 9,10-dihydroxystearic acid (DHSA). The particle morphology and the pH-responsive behavior of the liquid marbles were investigated. The rolling time during the preparation of liquid marbles has a great influence on the thickness of powder adsorption and the stability of the marbles. Compared with the liquid marbles stabilized by other fatty acids (e.g., stearic acid and docosoic acid), the liquid marbles prepared by DHSA have a much higher mechanical robustness. The increase in the number of hydroxyl groups on the carbon chain of fatty acids improves the mechanical robustness of the liquid marbles. Such liquid marbles immediately disintegrated on the surface of an alkaline solution or after exposure to NH3 gas, which extends their applications in the NH3 sensor and chemical reactions.
研究领域:
材料科学
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化学工程
·
传感技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jinhua Liu,Lan Guan,Zhe Li,Li Huang,Dan Li,Zhe Li,Xiaohui Wang,Yingqun Zhu,Yuanan Liu
Real-time blood gas analysis is of great significance in disease diagnosis and treatment. Here we have developed a pH, PO 2 and PCO 2 multifunctional fluorescent capillary sensing system. The pH, O 2 and CO 2 fluorescent indicators with same excitation wavelength are fixed into a single capillary tube. The sensing system possesses sensitive fluorescence response to pH, O 2 and CO 2 , and the changes of pH, O 2 and CO 2 in buffer, in vitro, and in vivo can be detected simultaneously by measuring the fluorescence signals of sensor probe. The PO 2 , PCO 2 and pH of rabbits in four disease models were assessed efficiently by the sensing system, exhibiting similar variation trend with the results by blood gas analyzer. Studies in living rabbit display the reasonable and favorable feasibility of capillary sensing system in real-time arterial blood gas analysis. Overall, the multifunctional fluorescent capillary sensing system exhibits significant potential in real-time arterial blood gas analysis and clinical application of disease diagnosis.
研究领域:
医学诊断
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生物传感技术
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Haiyong Chen,Jing Wang,Duoliang Shan,Jing Chen,Shouting Zhang,Xiaoquan Lu
pH plays an important role in understanding physiological/pathologic processes, and abnormal pH is a symbol of many common diseases such as cancer, stroke, and Alzheimer’s disease. In this work, an effective dual-emission fluorescent metal–organic framework nanocomposite probe (denoted as RB-PCN) has been constructed for sensitive and broad-range detection of pH. RB-PCN was prepared by encapsulating the DBI-PEG-NH2-functionalized Fe3O4 into Zr-MOFs and then further reacting it with rhodamine B isothiocyanates (RBITC). In RB-PCN, RBITC is capable of sensing changes in pH in acidic solutions. Zr-MOFs not only enrich the target analyte but also exhibit a fluorescence response to pH changes in alkaline solutions. Based on the above structural and compositional features, RB-PCN could detect a wide range of pH changes. Importantly, such a nanoprobe could “see” the intracellular pH changes by fluorescence confocal imaging as well as “measure” the wider range of pH in actual samples by fluorescence spectroscopy. To the best of our knowledge, this is the first time a MOF-based dual-emitting fluorescent nanoprobe has been used for a wide range of pH detection.
研究领域:
材料科学
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化学
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纳米技术
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 5
·540-546
·
IF 1.067
Hong Jian,Zhou De-xia,Hao Hong-xing,Zhao Min,Bian Hong-tao
Hydrogels show versatile properties and are of great interest in the fields of
bioelectronics and tissue engineering. Understanding the dynamics of the water
molecules trapped in the three-dimensional polymeric networks of the hydrogels
is crucial to elucidate their mechanical and swelling properties at the
molecular level. In this report, the poly(DMAEMA-co-AA) hydrogels were
synthesized and characterized by the macroscopic swelling measurements under
different pH conditions. Furthermore, the microscopic structural dynamics of pH
stimulus-responsive hydrogels were studied using FTIR and ultrafast IR
spectroscopies from the viewpoint of the SCN − anionic solute as the
local vibrational reporter. Ultrafast IR spectroscopic measurements showed the
time constants of the vibrational population decay of SCN − were
increased from 14±1 ps to 20±1 ps when the pH of the hydrogels varied from 2.0
to 12.0. Rotational anisotropy measurements further revealed that the rotation
of SCN − anionic probe was restricted by the three-dimensional network
formed in the hydrogels and the rotation of SCN − anionic probe cannot
decay to zero especially at the pH of 7.0. These results are expected to provide
a molecular-level understanding of the microscopic structure of the cross-linked
polymeric network in the pH stimulus-responsive hydrogels.
研究领域:
生物材料学
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分子动力学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Xiheng Kang,Yun-Yan Wang,Shuangfei Wang,Xueping Song
One of the key issues in the development of biofuels using lignocellulosic feedstocks is to increase the yield of fermented sugar, and simultaneously decrease the generation of fermentation inhibitors. Therefore, it is essential to understand the degradation mechanism of xylan during hot-water pretreatment. We analyzed the hydrothermal degradation products of xylan and xylose under different conditions. Results showed that furfural and formic acid formed from xylose reached a maximum value of 32.56 % and 35.14 %, respectively. By increasing the initial pH of the xylan solution, the furfural concentration can be reduced effectively to 2% and the formation of formic acid was preferred under alkaline conditions. On this basis, we proposed a new hydrothermal degradation pathway of xylan in alkaline solution. The in-depth understanding of xlyan degradation during hot water pre-treatment will be beneficial for improving the efficiency of biofuel production.
研究领域:
生物能源
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化学工程
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Jianjun Lian,Heli Wang,Hongping He,Weilin Huang,Mei Yang,Yin Zhong,Ping’an Peng
Iron sulfide (FeS) is an important scavenger for hexavalent molybdate (Mo(VI)) in an anoxic environment; it plays a crucial role in the mobilization and transformation of Mo(VI), although the underlying reaction mechanisms between Mo(VI) and FeS remain unclear. This study investigates the Mo(VI) reaction kinetics with the amorphous FeS over a pH range 5.0–9.0 and Mo’s chemical form on the FeS surface. It is found that the Mo(VI) reaction kinetics with FeS follow a pseudo first-order model, and the reaction rate constant ( k obs ) increases with a decrease in the pH value. The k obs at pH 5.0 is 0.027 min −1 , which is about 38 times higher than that at pH 9.0. The rapid Mo(VI) removal under acidic conditions is due to quick Mo(VI) transformation into stable MoS 2 and thiomolybdate (Mo V O x S y ). The amount of MoS 2 formed on the surface of FeS increases with a decrease in the pH value. Under neutral and alkaline conditions, Mo(VI) is not transformed into MoS 2 by FeS because the precipitation of iron oxy-hydroxide passivates the active sites of FeS. The study also investigates the effect of the initial dosage of FeS (20–200 mg L −1 ) and Mo(VI) (10–50 mg L −1 ) on the reaction kinetics of Mo(VI) with FeS. The results provides important information on the environmental fate of Mo(VI) in the anoxic environment containing amorphous FeS.
研究领域:
环境科学
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地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·490
·
IF 3.9
Wenrui Zhang,Meilu Hao,Yonghui Wang,Pengfei Sun,Dongjuan Zeng,Xinya Wang,Peng Liang
Layered δ-MnO2catalysts were prepared using the one-step redox method in precursor solutions with five different pH values (pH = 7, 9, 11, 13, and 14). The effects of pH on the physical properties and catalytic activity of the catalyst were investigated through XRD, SEM, TEM, BET, XPS, H2-TPR, and HCHO degradation tests at room temperature. The results showed that the layer spacing, manganese vacancy content, Mn4+/Mn3+ratio, and surface-reactive oxygen species content of MnO2increased with the increase in pH value in the alkaline range. When the catalyst was prepared at pH = 13, the above characteristics of the catalyst reached the optimal value which contributed to the high catalytic activity. Combined with the related characterization results, it was proved that changing the pH can affect the degree of oxidation in the catalyst synthesis process, increase the number of active oxygen and the oxygen mobility of the catalyst, and effectively improve the catalytic activity of the manganese dioxide catalyst for HCHO. This work represents a giant step toward the preparation of an effective catalyst for practical applications of HCHO removal at room temperature at a low concentration and high velocity.Keywords:δ-MnO2;pH;formaldehyde;manganese vacancy;surface-reactive oxygen species
研究领域:
催化
·
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Polymeric Materials and Polymeric Biomaterials
·
2018
·
IF 2.127
Qian Wang,Xiao Qi Jin,Ji Hong Sun,Shi Yang Bai,Xia Wu,Hamida Panezai
The pH-responsive hollow poly(acrylic acid) (HPAA) microspheres with regulated cavity structure and various shell thicknesses were synthesized. Their structural parameters and textural properties were characterized by various techniques. The ibuprofen loading results indicate the good drug loading capabilities of HPAA microspheres from 13.81 to 17.18%. Their ibuprofen release properties demonstrated their good pH sensitivity and distance-controlled drug diffusion process. Specially, the small-angle X-ray scattering technique was used to suggest the surface roughness and structural irregularities of HPAA before and after drug loading and releasing. These findings clearly indicate the potential of HPAA microspheres to be used as promising candidates in drug delivery.
研究领域:
材料科学
·
药学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Zhilang Xu,Die Yang,Tao Long,Lun Yuan,Shi Qiu,Defu Li,Changdao Mu,Liming Ge
pH-Responsive nanoparticles (NPs) have emerged as an effective antitumor drug delivery system, promoting the drugs accumulation in the tumor and selectively releasing drugs in tumoral acidic microenvironment. Herein, we developed a new amphiphilic modified hydroxyethyl starch (HES) based pH-sensitive nanocarrier of antitumor drug delivery. HES was first modified by hydrophilic imidazole and hydrophobic cholesterol to obtain an amphiphilic polymer (IHC). Then IHC can self-assemble to encapsulate doxorubicin (DOX) and form doxorubicin-loaded nanoparticles (DOX/IHC NPs), which displayed good stability for one week storage and acidic sensitive long-term sustained release of DOX. As a result, cancer cell endocytosed DOX/IHC NPs could continuously release doxorubicin into cytoplasm and nucleus to effectively kill cancer cells. Additionally, DOX/IHC NPs could be effectively enriched in the tumor tissue, showing enhanced tumor growth inhibition effect compared to free doxorubicin. Overall, our amphiphilic modified HES-based NPs possess a great potential as drug delivery system for cancer chemotherapy.
研究领域:
药理学
·
纳米技术
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Gaihuan Ren,MaoXin Wang,Lei Wang,Zengzi Wang,Qianqian Chen,Zhenghe Xu,Dejun Sun
Dynamic covalent surfactants have been recently reported for preparation of pH-switchable emulsions [Sun, D. Langmuir, 2017, 33, 3040]. In this study, dynamic covalent silica (SiO2-B) nanoparticles of switchable wettability were fabricated by a pH-responsive dynamic (covalent) imine bond between hydrophilic amino silica (SiO2-NH2) nanoparticles and hydrophobic benzaldehyde molecules. The properties of SiO2-B were characterized by Fourier transform infrared spectroscopy, elemental analysis, contact angle measurement, and ζ potential measurement. The hydrophilicity and hydrophobicity of SiO2-B were shown to be readily switchable by adjusting pH between 7.8 and 3.5. At pH 7.8, SiO2-B was partially hydrophobic and adsorbed at oil–water interface to stabilize O/W Pickering emulsions, which were characterized by electrical conductivity, optical microscopy, and confocal laser scanning microscopy. Upon lowering the pH to 3.5, the dynamic covalent bond is dissociated to convert partially hydrophobic SiO2-B into highly hydrophilic SiO2-NH2 and surface-inactive benzaldehyde. Both of them desorb from oil–water interface, resulting in a rapid oil–water separation of the Pickering emulsions. Alternating stabilization and phase separation of the Pickering emulsions over 3 cycles were demonstrated by adjusting the pH. The pH-switchable Pickering emulsions show great potential in application to effective oil–water separation of emulsions.
研究领域:
材料科学
·
界面化学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）