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Pan X, Liu T, Hou Q. Artificial Layer Construction via Cosolvent Enables Stable Ni-Rich Cathodes for Enhanced Lithium Storage. ACS Appl Mater Interfaces 2024. [PMID: 38470147 DOI: 10.1021/acsami.4c00686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
Ni-rich cathodes have recently gained significant attention as next-generation cathodes for lithium-ion batteries. However, their relatively high oxidative surface should be reduced to control the high surface reactivity because the capacity retention decreases rapidly in the batteries. Herein, a simple and effective method to pretreat LiNi0.8Mn0.1Co0.1O2 (NMC811) particles using a cosolvent for improving the battery performance is reported. Imitating the interfacial reaction in practical cells, an artificial layer is created via a spontaneous redox reaction between the cathode and the organic solvent. The artificial layer comprises metal-organic compounds with reduced transition-metal cations. Benefiting from the artificial layer, the cells deliver high capacity retention at a high current density and better rate capability, which might result from the low and stable interfacial resistance of the modified NMC811 cathode. Our approach can effectively reduce the high oxidative surface of most oxide cathode materials and induce a long cyclic lifespan and high capacity retention in most battery systems.
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Affiliation(s)
- Xiaona Pan
- Department of Basic Sciences, Shanxi Agricultural University, Taigu, Shanxi 030801, China
| | - Tianyi Liu
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Qingjie Hou
- College of Resource and Environment, Shanxi Agricultural University, Jinzhong 030801, China
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2
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Caviedes-Rubio DI, Ortiz CP, Martinez F, Delgado DR. Thermodynamic Assessment of Triclocarban Dissolution Process in N-Methyl-2-pyrrolidone + Water Cosolvent Mixtures. Molecules 2023; 28:7216. [PMID: 37894697 PMCID: PMC10609577 DOI: 10.3390/molecules28207216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 10/12/2023] [Accepted: 10/17/2023] [Indexed: 10/29/2023] Open
Abstract
Solubility is one of the most important physicochemical properties due to its involvement in physiological (bioavailability), industrial (design) and environmental (biotoxicity) processes, and in this regard, cosolvency is one of the best strategies to increase the solubility of poorly soluble drugs in aqueous systems. Thus, the aim of this research is to thermodynamically evaluate the dissolution process of triclocarban (TCC) in cosolvent mixtures of {N-methyl-2-pyrrolidone (NMP) + water (W)} at seven temperatures (288.15, 293.15, 298.15, 303.15, 308.15, 313.15 and 318.15 K). Solubility is determined by UV/vis spectrophotometry using the flask-shaking method. The dissolution process of the TCC is endothermic and strongly dependent on the cosolvent composition, achieving the minimum solubility in pure water and the maximum solubility in NMP. The activity coefficient decreases from pure water to NMP, reaching values less than one, demonstrating the excellent positive cosolvent effect of NMP, which is corroborated by the negative values of the Gibbs energy of transfer. In general terms, the dissolution process is endothermic, and the increase in TCC solubility may be due to the affinity of TCC with NMP, in addition to the water de-structuring capacity of NMP generating a higher number of free water molecules.
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Affiliation(s)
- Diego Ivan Caviedes-Rubio
- Programa de Ingeniería Civil, Grupo de Investigación de Ingenierías UCC-Neiva, Facultad de Ingeniería, Universidad Cooperativa de Colombia, Sede Neiva, Calle 11 No. 1-51, Neiva 410001, Colombia;
| | - Claudia Patricia Ortiz
- Programa de Administración en Seguridad y Salud en el Trabajo, Grupo de Investigación en Seguridad y Salud en el Trabajo, Corporación Universitaria Minuto de Dios-UNIMINUTO, Neiva 410001, Colombia;
| | - Fleming Martinez
- Grupo de Investigaciones Farmacéutico-Fisicoquímicas, Departamento de Farmacia, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Carrera 30 No. 45-03, Bogotá 110321, Colombia;
| | - Daniel Ricardo Delgado
- Programa de Ingeniería Civil, Grupo de Investigación de Ingenierías UCC-Neiva, Facultad de Ingeniería, Universidad Cooperativa de Colombia, Sede Neiva, Calle 11 No. 1-51, Neiva 410001, Colombia;
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3
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Kang M, Kim J, Lim H, Ko J, Kim HS, Joo Y, Moon SY, Jang SG, Lee E, Ahn S. Eco-Friendly Dispersant-Free Purification Method of Boron Nitride Nanotubes through Controlling Surface Tension and Steric Repulsion with Solvents. Nanomaterials (Basel) 2023; 13:2593. [PMID: 37764622 PMCID: PMC10537017 DOI: 10.3390/nano13182593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 09/15/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
Boron nitride nanotubes (BNNTs) were purified without the use of a dispersant by controlling the surface tension and steric repulsion of solvent molecules. This method effectively enhanced the difference in solubilities of impurities and BNNTs. The purification process involved optimizing the alkyl-chains of alcohol solvents and adjusting the concentration of alcohol solvent in water to regulate surface tension and steric repulsion. Among the solvents tested, a 70 wt% t-butylalcohol in water mixture exhibited the highest selective isolation of BNNTs from impurities based on differences in solubilities. This favorable outcome was attributed to the surface tension matching with BNNTs, steric repulsion from bulky alkyl chain structures, and differences in interfacial energy between BNNT-liquid and impurity-liquid interfaces. Through this optimized purification process, impurities were removed to an extent of up to 93.3%. Additionally, the purified BNNTs exhibited a distinct liquid crystal phase, which was not observed in the unpurified BNNTs.
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Affiliation(s)
- Minsung Kang
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Jungmo Kim
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon-si 51543, Republic of Korea
| | - Hongjin Lim
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
| | - Jaehyoung Ko
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
| | - Hong-Sik Kim
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
| | - Yongho Joo
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
| | - Se Youn Moon
- Department of Quantum System Engineering, Jeonbuk National University, Jeonju-si 54896, Republic of Korea
| | - Se Gyu Jang
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
| | - Eunji Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Seokhoon Ahn
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Republic of Korea; (M.K.)
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4
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Luo Z, Shu Z, Jiang Y, Wang B. Effect of Cosolvent on the Vesicle Formation Pathways under Solvent Exchange Process: A Dissipative Particle Dynamics Simulation. Molecules 2023; 28:5113. [PMID: 37446777 DOI: 10.3390/molecules28135113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 06/21/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023] Open
Abstract
The effective control over the vesicle formation pathways is vital for tuning its function. Recently, a liquid-liquid phase-separated intermediate (LLPS) is observed before a vesicular structure during the solvent exchange self-assembly of block copolymers. Though the understanding of polymer structures and chemical compositions on the competition between LLPS and micellization has made some progress, little is known about the role of cosolvent on it. In this study, the influence of cosolvent on the vesicle formation pathways is investigated by using dissipative particle dynamics. The results show that the range of water fraction within which the LLPS is favored will be highly dependent on the affinity difference of cosolvent to water and to polymer repeat units. The change of the cosolvent-water interaction and the water fraction impact the distribution of cosolvent in the polymer domain, the miscibility between the components in the system as well as the chain conformations, which finally induce different self-assembly behaviors. Our findings would be helpful for understanding the LLPS and controlling the morphologies of diblock polymers in solutions for further applications.
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Affiliation(s)
- Zhonglin Luo
- Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Zhou Shu
- Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Yi Jiang
- Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Biaobing Wang
- Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
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He M, Zheng W, Wang N, Gao H, Ouyang D, Huang Z. Molecular Dynamics Simulation of Drug Solubilization Behavior in Surfactant and Cosolvent Injections. Pharmaceutics 2022; 14:2366. [PMID: 36365184 PMCID: PMC9692798 DOI: 10.3390/pharmaceutics14112366] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 10/21/2022] [Accepted: 10/27/2022] [Indexed: 10/03/2023] Open
Abstract
Surfactants and cosolvents are often combined to solubilize insoluble drugs in commercially available intravenous formulations to achieve better solubilization. In this study, six marketed parenteral formulations with surfactants and cosolvents were investigated on the aggregation processes of micelles, the structural characterization of micelles, and the properties of solvent using molecular dynamics simulations. The addition of cosolvents resulted in better hydration of the core and palisade regions of micelles and an increase in both radius of gyration (Rg) and the solvent accessible surface area (SASA), causing a rise in critical micelle concentration (CMC), which hindered the phase separation of micelles. At the same time, the presence of cosolvents disrupted the hydrogen bonding structure of water in solution, increasing the solubility of insoluble medicines. Therefore, the solubilization mechanism of the cosolvent and surfactant mixtures was successfully analyzed by molecular dynamics simulation, which will benefit future formulation development for drug delivery.
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Affiliation(s)
- Meiqi He
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523710, China
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences (ICMS), University of Macau, Macau 999078, China
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan 523808, China
| | - Wenwen Zheng
- Department of Clinical Laboratory, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou 510655, China
| | - Nannan Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences (ICMS), University of Macau, Macau 999078, China
| | - Hanlu Gao
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences (ICMS), University of Macau, Macau 999078, China
| | - Defang Ouyang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences (ICMS), University of Macau, Macau 999078, China
| | - Zunnan Huang
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523710, China
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan 523808, China
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Baracaldo-Santamaría D, Calderon-Ospina CA, Ortiz CP, Cardenas-Torres RE, Martinez F, Delgado DR. Thermodynamic Analysis of the Solubility of Isoniazid in (PEG 200 + Water) Cosolvent Mixtures from 278.15 K to 318.15 K. Int J Mol Sci 2022; 23:ijms231710190. [PMID: 36077585 PMCID: PMC9456571 DOI: 10.3390/ijms231710190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/01/2022] [Accepted: 09/01/2022] [Indexed: 11/16/2022] Open
Abstract
The solubility of drugs in cosolvent systems of pharmaceutical interest is of great importance for understanding and optimizing a large number of processes. Here, we report the solubility of isoniazid in nine (PEG 200 + water) cosolvent mixtures at nine temperatures (278.15, 283.15, 288.15, 293.15, 298.15, 303.15, 308.15, and 318.15 K) determined by UV-vis spectrophotometry. From the solubility data, the thermodynamic solution, mixing, and transfer functions were calculated in addition to performing the enthalpy-entropy compensation analysis. The solubility of isoniazid depends on the concentration of PEG 200 (positive cosolvent effect) and temperature (endothermic process) reaching its maximum solubility in pure PEG 200 at 318.15 K and the lowest solubility in pure water at 278.15 K. The solution process is favored by the solution entropy and according to the enthalpy-entropy compensation analysis it is driven by entropy in mixtures rich in water and by enthalpy in mixtures rich in PEG 200.
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Affiliation(s)
- Daniela Baracaldo-Santamaría
- Pharmacology Unit, Department of Biomedical Sciences, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá 111221, Colombia
| | - Carlos Alberto Calderon-Ospina
- Pharmacology Unit, Department of Biomedical Sciences, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá 111221, Colombia
- GENIUROS Research Group, Center for Research in Genetics and Genomics (CIGGUR), School of Medicine and Health Sciences, Universidad del Rosario, Bogotá 111221, Colombia
| | - Claudia Patricia Ortiz
- Programa de Administración en Seguridad y Salud en el Trabajo, Grupo de Investigación en Seguridad y Salud en el Trabajo, Corporación Universitaria Minuto de Dios-UNIMINUTO, Neiva 410001, Colombia
| | - Rossember Edén Cardenas-Torres
- Grupo de Fisicoquímica y Análisis Matemático, Facultad de Ciencias y Humanidades, Fundación Universidad de América, Bogotá 111221, Colombia
| | - Fleming Martinez
- Grupo de Investigaciones Farmacéutico-Fisicoquímicas, Departamento de Farmacia, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Carrera 30 No. 45-03, Bogotá 111221, Colombia
| | - Daniel Ricardo Delgado
- Programa de Ingeniería Civil, Grupo de Investigación de Ingenierías UCC-Neiva, Facultad de Ingeniería, Universidad Cooperativa de Colombia, Sede Neiva, Neiva 410001, Colombia
- Correspondence: ; Tel.: +57-321-910-4471
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Aziz D, Mohamed SA, Tayel S, Makhlouf A. Enhanced Ocular Anti-Aspergillus Activity of Tolnaftate Employing Novel Cosolvent-Modified Spanlastics: Formulation, Statistical Optimization, Kill Kinetics, Ex Vivo Trans-Corneal Permeation, In Vivo Histopathological and Susceptibility Study. Pharmaceutics 2022; 14:pharmaceutics14081746. [PMID: 36015372 PMCID: PMC9415006 DOI: 10.3390/pharmaceutics14081746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/09/2022] [Accepted: 08/16/2022] [Indexed: 11/24/2022] Open
Abstract
Tolnaftate (TOL) is a thiocarbamate fungicidal drug used topically in the form of creams and ointments. No ocular formulations of TOL are available for fungal keratitis (FK) treatment due to its poor water solubility and unique ocular barriers. Therefore, this study aimed at developing novel modified spanlastics by modulating spanlastics composition using different glycols for enhancing TOL ocular delivery. To achieve this goal, TOL basic spanlastics were prepared by ethanol injection method using a full 32 factorial design. By applying the desirability function, the optimal formula (BS6) was selected and used as a nucleus for preparing and optimizing TOL-cosolvent spanlastics according to the full 31.21 factorial design. The optimal formula (MS6) was prepared using 30% propylene glycol and showed entrapment efficiency percent (EE%) of 66.10 ± 0.57%, particle size (PS) of 231.20 ± 0.141 nm, and zeta potential (ZP) of -32.15 ± 0.07 mV. MS6 was compared to BS6 and both nanovesicles significantly increased the corneal permeation potential of TOL than drug suspension. Additionally, in vivo histopathological experiment was accomplished and confirmed the tolerability of MS6 for ocular use. The fungal susceptibility testing using Aspergillus niger confirmed that MS6 displayed more durable growth inhibition than drug suspension. Therefore, MS6 can be a promising option for enhanced TOL ocular delivery.
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Affiliation(s)
- Diana Aziz
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
| | - Sally A. Mohamed
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo 12613, Egypt
| | - Saadia Tayel
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
| | - Amal Makhlouf
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
- Correspondence:
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Ou X, Lao Y, Xu J, Wutthinitikornkit Y, Shi R, Chen X, Li J. ATP Can Efficiently Stabilize Protein through a Unique Mechanism. JACS Au 2021; 1:1766-1777. [PMID: 34723279 PMCID: PMC8549052 DOI: 10.1021/jacsau.1c00316] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Recent experiments suggested that ATP can effectively stabilize protein structure and inhibit protein aggregation when its concentration is less than 10 mM, which is significantly lower than cosolvent concentrations required in conventional mechanisms. The ultrahigh efficiency of ATP suggests a unique mechanism that is fundamentally different from previous models of cosolvents. In this work, we used molecular dynamics simulation and experiments to study the interactions of ATPs with three proteins: lysozyme, ubiquitin, and malate dehydrogenase. ATP tends to bind to the surface regions with high flexibility and high degree of hydration. These regions are also vulnerable to thermal perturbations. The bound ATPs further assemble into ATP clusters mediated by Mg2+ and Na+ ions. More interestingly, in Mg2+-free ATP solution, Na+ at higher concentration (150 mM under physiological conditions) can similarly mediate the formation of the ATP cluster on protein. The ATP cluster can effectively reduce the fluctuations of the vulnerable region and thus stabilize the protein against thermal perturbations. Both ATP binding and the considerable improvement of thermal stability of ATP-bound protein were verified by experiments.
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Affiliation(s)
- Xinwen Ou
- Zhejiang
Province Key Laboratory of Quantum Technology and Device, Department
of Physics, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
| | - Yichong Lao
- Zhejiang
Province Key Laboratory of Quantum Technology and Device, Department
of Physics, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
| | - Jingjie Xu
- Eye
Center of the Second Affiliated Hospital, Institute of Translational
Medicine, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Yanee Wutthinitikornkit
- Zhejiang
Province Key Laboratory of Quantum Technology and Device, Department
of Physics, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
| | - Rui Shi
- Zhejiang
Province Key Laboratory of Quantum Technology and Device, Department
of Physics, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
| | - Xiangjun Chen
- Eye
Center of the Second Affiliated Hospital, Institute of Translational
Medicine, School of Medicine, Zhejiang University, Hangzhou 310009, China
| | - Jingyuan Li
- Zhejiang
Province Key Laboratory of Quantum Technology and Device, Department
of Physics, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
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Hussain A, Altamimi MA, Alshehri S, Imam SS, Alnemer UA, Haque MW. Experimental Solubility of Ketoconazole, Validation Models, and In vivo Prediction in Human Based on GastroPlus. AAPS PharmSciTech 2021; 22:194. [PMID: 34184161 DOI: 10.1208/s12249-021-02075-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 06/14/2021] [Indexed: 11/30/2022] Open
Abstract
The study aimed to identify a suitable cosolvent + water mixture for subcutaneous (sub-Q) delivery of ketoconazole (KETO). The solubility was assessed for several dimethyl acetamide (DMA) + water mixtures at T = 293.2 to 318.2 K and pressure P = 0.1 MPa. The experimental solubility (xe) was validated using the Van 't Hoff and Yalkowsky models and functional thermodynamic parameters (enthalpy ΔsolH°, entropy ΔsolS°, and Gibbs free energy ΔsolG°). The in vitro drug release study was performed at physiological pH, and the data served as the input to GastroPlus, which predicted the in vivo performance of KETO dissolved in a DMA + water cosolvent mixture for sub-Q delivery in human. The maximum solubility (mole fraction) of KETO (9.81 × 10-1) was obtained for neat DMA at 318.2 K whereas the lowest value (1.7 × 10-5) was for pure water at 293.2 K. An apparent thermodynamic analysis based on xe gave positive values for the functional parameters. KETO dissolution requires energy, as evidenced by the high positive values of ΔsolH° and ΔsolG°. Interestingly, ΔsolG° progressively decreased with increasing concentration of DMA in the DMA + water mixture, suggesting that the DMA-based molecular interaction improved the solubilization. Positive values of ΔsolG° and ΔsolS° for each DMA + water cosolvent mixture corroborated the endothermic and entropy-driven dissolution. GastroPlus predicted better absorption of KETO through sub-Q delivery than oral delivery. Hence, the DMA + water mixture may be a promising system for sub-Q delivery of KETO to control topical and systemic fungal infections.
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Kaspar F, Neubauer P, Kurreck A. The Peculiar Case of the Hyper-thermostable Pyrimidine Nucleoside Phosphorylase from Thermus thermophilus*. Chembiochem 2021; 22:1385-1390. [PMID: 33258231 PMCID: PMC8247850 DOI: 10.1002/cbic.202000679] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/22/2020] [Indexed: 12/16/2022]
Abstract
The poor solubility of many nucleosides and nucleobases in aqueous solution demands harsh reaction conditions (base, heat, cosolvent) in nucleoside phosphorylase-catalyzed processes to facilitate substrate loading beyond the low millimolar range. This, in turn, requires enzymes that can withstand these conditions. Herein, we report that the pyrimidine nucleoside phosphorylase from Thermus thermophilus is active over an exceptionally broad pH (4-10), temperature (up to 100 °C) and cosolvent space (up to 80 % (v/v) nonaqueous medium), and displays tremendous stability under harsh reaction conditions with predicted total turnover numbers of more than 106 for various pyrimidine nucleosides. However, its use as a biocatalyst for preparative applications is critically limited due to its inhibition by nucleobases at low concentrations, which is unprecedented among nonspecific pyrimidine nucleoside phosphorylases.
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Affiliation(s)
- Felix Kaspar
- Department of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität BerlinStraße des 17. Juni 13510623BerlinGermany
- BioNukleo GmbHAckerstraße 7613355BerlinGermany
| | - Peter Neubauer
- Department of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität BerlinStraße des 17. Juni 13510623BerlinGermany
| | - Anke Kurreck
- Department of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität BerlinStraße des 17. Juni 13510623BerlinGermany
- BioNukleo GmbHAckerstraße 7613355BerlinGermany
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11
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Panraksa P, Tipduangta P, Jantanasakulwong K, Jantrawut P. Formulation of Orally Disintegrating Films as an Amorphous Solid Solution of a Poorly Water-Soluble Drug. Membranes (Basel) 2020; 10:membranes10120376. [PMID: 33261025 PMCID: PMC7759778 DOI: 10.3390/membranes10120376] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 11/18/2020] [Accepted: 11/25/2020] [Indexed: 12/28/2022]
Abstract
The objective of the present study was to develop an orally disintegrating film (ODF) for a poorly water-soluble drug, phenytoin (PHT), using the cosolvent solubilization technique to achieve the amorphization of the drug, followed by the preparation of ODFs. Eleven formulations were prepared with different polymers, such as polyvinyl alcohol (PVA) and high methoxyl pectin (HMP) by the solvent casting method. The prepared films were subjected to characterization for weight variations, thickness, surface pH, disintegration time and mechanical strength properties. Then, differential scanning calorimetry, X-ray diffraction analysis and the drug release patterns of the selected films were evaluated. Among the prepared formulations, the formulation composed of 1% w/w of PVA, 0.04% w/w of sodium starch glycolate with polyethylene glycol 400, glycerin and water as cosolvents (PVA-S4) showed promising results. The physical appearance and mechanical strength properties were found to be good. The PVA-S4 film was clear and colorless with a smooth surface. The surface pH was found to be around 7.47 and the in vitro disintegration time was around 1.44 min. The drug content of the PVA-S4 film was 100.27%. X-ray diffractometry and thermal analysis confirmed the transition of phenytoin in the PVA-S4 film into a partially amorphous state during film preparation using the cosolvent solubilization approach. The resulting PVA-S4 film showed a higher dissolution rate in comparison to the film without a cosolvent. Overall, this study indicated the influence of cosolvents on enhancing the solubility of a poorly water-soluble drug and its film dissolution.
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Affiliation(s)
- Pattaraporn Panraksa
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand; (P.P.); (P.T.)
| | - Pratchaya Tipduangta
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand; (P.P.); (P.T.)
| | - Kittisak Jantanasakulwong
- Division of Packaging Technology, School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai 50100, Thailand;
- Cluster of Agro Bio-Circular-Green Industry (Agro BCG), Chiang Mai University, Chiang Mai 50100, Thailand
| | - Pensak Jantrawut
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand; (P.P.); (P.T.)
- Cluster of Agro Bio-Circular-Green Industry (Agro BCG), Chiang Mai University, Chiang Mai 50100, Thailand
- Correspondence: or ; Tel.: +66-5394-4309
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Shakeel F, Haq N, Alsarra IA, Alshehri S. Solubility, Hansen Solubility Parameters and Thermodynamic Behavior of Emtricitabine in Various (Polyethylene Glycol-400 + Water) Mixtures: Computational Modeling and Thermodynamics. Molecules 2020; 25:molecules25071559. [PMID: 32231154 PMCID: PMC7181241 DOI: 10.3390/molecules25071559] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 03/25/2020] [Accepted: 03/28/2020] [Indexed: 02/07/2023] Open
Abstract
This study was aimed to find out the solubility, thermodynamic behavior, Hansen solubility parameters and molecular interactions of an antiviral drug emtricitabine (ECT) in various “[polyethylene glycol-400 (PEG-400) + water]” mixtures. The solubility of ECT in mole fraction was determined at “T = 298.2 to 318.2 K” and “p = 0.1 MPa” using an isothermal method. The experimental solubilities of ECT in mole fraction were validated and correlated using various computational models which includes “Van’t Hoff, Apelblat, Yalkowsky-Roseman, Jouyban-Acree and Jouyban-Acree-Van’t Hoff models”. All the models performed well in terms of model correlation. The solubility of ECT was increased with the raise in temperature in all “PEG-400 + water” mixtures studied. The highest and lowest solubility values of ECT were found in pure PEG-400 (1.45 × 10−1) at “T = 318.2 K” and pure water (7.95 × 10−3) at “T = 298.2 K”, respectively. The quantitative values of activity coefficients indicated higher interactions at molecular level in ECT and PEG-400 combination compared with ECT and water combination. “Apparent thermodynamic analysis” showed an “endothermic and entropy-driven dissolution” of ECT in all “PEG-400 + water” combinations studied. The solvation nature of ECT was found an “enthalpy-driven” in each “PEG-400 + water” mixture studied.
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Li Z, Guo D, Xiao P, Chen J, Ning H, Wang Y, Zhang X, Fu X, Yao R, Peng J. Silver Nanorings Fabricated by Glycerol-Based Cosolvent Polyol Method. Micromachines (Basel) 2020; 11:mi11030236. [PMID: 32106449 PMCID: PMC7143913 DOI: 10.3390/mi11030236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/22/2020] [Accepted: 02/22/2020] [Indexed: 11/16/2022]
Abstract
The urgent demand for transparent flexible electrodes applied in wide bandgap devices has promoted the development of new materials. Silver nanoring (AgNR), known as a special structure of silver nanowire (AgNW), exhibits attractive potential in the field of wearable electronics. In this work, an environmentally friendly glycerol-based cosolvent polyol method was investigated. The Taguchi design was utilized to ascertain the factors that affect the yield and ring diameter of AgNRs. Structural characterization showed that AgNR seeds grew at a certain angle during the early nucleation period. The results indicated that the yield and ring diameter of AgNRs were significantly affected by the ratio of cosolvent. Besides, the ring diameter of AgNRs was also tightly related to the concentration of polyvinylpyrrolidone (PVP). The difference of reducibility between glycerol, water, and ethylene glycol leads to the selective growth of (111) plane and is probably the main reason AgNRs are formed. As a result, AgNRs with a ring diameter range from 7.17 to 42.94 μm were synthesized, and the quantity was increased significantly under the optimal level of factors.
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Affiliation(s)
- Zhihang Li
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
| | - Dong Guo
- School of Medical Instrument & Food Engineering, University of Shanghai for Science and Technology, No.516 Jungong Road, Shanghai 200093, China;
| | - Peng Xiao
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China;
| | - Junlong Chen
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
| | - Honglong Ning
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
- Correspondence: (H.N.); (R.Y.); Tel.: +86-20-8711-4525 (H.N.)
| | - Yiping Wang
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
| | - Xu Zhang
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
| | - Xiao Fu
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
| | - Rihui Yao
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
- Guangdong Province Key Lab of Display Material and Technology, Sun Yat-sen University, Guangzhou 510275, China
- Correspondence: (H.N.); (R.Y.); Tel.: +86-20-8711-4525 (H.N.)
| | - Junbiao Peng
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; (Z.L.); (J.C.); (X.Z.); (X.F.); (J.P.)
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14
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Qin Y, Ren Z, Wang Q, Li Y, Liu J, Liu Y, Guo B, Wang D. Simplifying the Electrolyte Systems with the Functional Cosolvent. ACS Appl Mater Interfaces 2019; 11:27854-27861. [PMID: 31309824 DOI: 10.1021/acsami.9b07827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The state-of-the-art electrolytes utilized in lithium-ion batteries are based on liquid carbonates combining a number of additives to fulfill the practical requirements including safety and low temperature. The plenty of components result in the quadruple times of probable radical groups involved into the interfacial reactions, rendering it too difficult to control the surface layer. This work tends to simplify the system with the fluorine-substituted ether as the functional cosolvent to expand the functions of basic electrolytes. The incorporation of this solvent enables the electrolyte to self-extinguish, reduces its freezing point to ∼75 °C lower, and assists in the formation of LiF-rich protective interlayers, resulting in the improvement of the rate capability, cryogenic performance, and cyclic stability for the LiNi1/3Co1/3Mn1/3O2 cathode. This novel design could significantly diminish the amount of necessary additives and possess the acceptable cost, which provides a probability to revitalize the development of liquid electrolytes.
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Affiliation(s)
- Yinping Qin
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Zhongmin Ren
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Qian Wang
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Yanyan Li
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Jian Liu
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Yang Liu
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Bingkun Guo
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
| | - Deyu Wang
- Materials Genome Institute , Shanghai University , Shanghai 200444 , China
- Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Zhejiang 315201 , China
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15
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Wangler A, Held C, Sadowski G. Thermodynamic Activity-Based Solvent Design for Bioreactions. Trends Biotechnol 2019; 37:1038-1041. [PMID: 31160055 DOI: 10.1016/j.tibtech.2019.04.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 04/28/2019] [Accepted: 04/29/2019] [Indexed: 11/25/2022]
Abstract
To improve the kinetics of enzyme-catalyzed reactions, cosolvents are commonly added to reaction mixtures. The search for a good cosolvent is still empirical and experimentally based. We discuss a thermodynamic activity-based approach that improves biocatalytic processes by predicting cosolvent influences on Michaelis constants, ultimately reducing time and cost.
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Affiliation(s)
- Anton Wangler
- Laboratory of Thermodynamics, Department of Biochemical and Chemical Engineering, Technische Universität (TU) Dortmund, Emil-Figge-Strasse 70, 44227 Dortmund, Germany
| | - Christoph Held
- Laboratory of Thermodynamics, Department of Biochemical and Chemical Engineering, Technische Universität (TU) Dortmund, Emil-Figge-Strasse 70, 44227 Dortmund, Germany.
| | - Gabriele Sadowski
- Laboratory of Thermodynamics, Department of Biochemical and Chemical Engineering, Technische Universität (TU) Dortmund, Emil-Figge-Strasse 70, 44227 Dortmund, Germany
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16
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Kang J, Wells SA, Sangwan VK, Lam D, Liu X, Luxa J, Sofer Z, Hersam MC. Solution-Based Processing of Optoelectronically Active Indium Selenide. Adv Mater 2018; 30:e1802990. [PMID: 30095182 DOI: 10.1002/adma.201802990] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 07/23/2018] [Indexed: 05/24/2023]
Abstract
Layered indium selenide (InSe) presents unique properties for high-performance electronic and optoelectronic device applications. However, efforts to process InSe using traditional liquid phase exfoliation methods based on surfactant-assisted aqueous dispersions or organic solvents with high boiling points compromise electronic properties due to residual surface contamination and chemical degradation. Here, these limitations are overcome by utilizing a surfactant-free, low boiling point, deoxygenated cosolvent system. The resulting InSe flakes and thin films possess minimal processing residues and are structurally and chemically pristine. When employed in photodetectors, individual InSe nanosheets exhibit a maximum photoresponsivity of ≈5 × 107 A W-1 , which is the highest value of any solution-processed monolithic semiconductor to date. Furthermore, the surfactant-free cosolvent system not only stabilizes InSe dispersions but is also amenable to the assembly of electronically percolating InSe flake arrays without posttreatment, which enables the realization of ultrahigh performance thin-film photodetectors. This surfactant-free, deoxygenated cosolvent approach can be generalized to other layered materials, thereby presenting additional opportunities for solution-processed thin-film electronic and optoelectronic technologies.
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Affiliation(s)
- Joohoon Kang
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Spencer A Wells
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Vinod K Sangwan
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - David Lam
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Xiaolong Liu
- Applied Physics Graduate Program, Northwestern University, Evanston, IL, 60208, USA
| | - Jan Luxa
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
| | - Zdeněk Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
| | - Mark C Hersam
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
- Applied Physics Graduate Program, Northwestern University, Evanston, IL, 60208, USA
- Department of Chemistry, Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA
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17
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Wang H, Xing S, Zheng Y, Kong J, Yu J, Taylor AD. Three-Phase Morphology Evolution in Sequentially Solution-Processed Polymer Photodetector: Toward Low Dark Current and High Photodetectivity. ACS Appl Mater Interfaces 2018; 10:3856-3864. [PMID: 29338189 DOI: 10.1021/acsami.7b15730] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Sequentially solution-processed polymer photodetectors (SSP PPDs) based on poly(3-hexylthiophene-2,5-diyl) (P3HT)/[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) are fabricated by depositing the top layers of PC71BM from an appropriate cosolvent of 2-chlorophenol (2-CP)/o-dichlorobenzene (ODCB) onto the predeposited bottom layers of P3HT. By adjusting the ratio of 2-CP/ODCB in the top PC71BM layers, the resulting SSP PPD shows a decreased dark current and an increased photocurrent, leading to a maximum detectivity of 1.23 × 1012 Jones at a wavelength of 550 nm. This value is 5.3-fold higher than that of the conventional bulk heterojunction PPD. Morphology studies reveal that the PC71BM partially penetrates the predeposited P3HT layer during the spin-coating process, resulting in an optimal three-phase morphology with one well-mixed interdiffusion P3HT/PC71BM phase in the middle of the bulk and two pure phases of P3HT and PC71BM at the two electrode sides. We show that the pure phases form high Schottky barriers (>2.0 eV) at the active layer/electrodes interface and efficiently block unfavorable reverse charge carrier injection by significantly decreasing the dark current. The interdiffussion phase enlarges the donor-acceptor interfacial area leading to a large photocurrent. We also reveal that the improved performance of SSP PPDs is also due to the enhanced optical absorption, improved P3HT crystallinity, increased charge carrier mobilities, and suppressed bimolecular recombination.
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Affiliation(s)
- Hanyu Wang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, P. R. China
- Department of Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States
| | - Shen Xing
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, P. R. China
| | - Yifan Zheng
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, P. R. China
- Department of Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States
| | - Jaemin Kong
- Department of Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University , New York, New York 11201, United States
| | - Junsheng Yu
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC) , Chengdu 610054, P. R. China
| | - André D Taylor
- Department of Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University , New York, New York 11201, United States
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18
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Wang H, Wen X, Zhang X, Liu C. Acetylation of Microcrystalline Cellulose by Transesterification in AmimCl/DMSO Cosolvent System. Molecules 2017; 22:molecules22091419. [PMID: 28846619 PMCID: PMC6151486 DOI: 10.3390/molecules22091419] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 08/21/2017] [Accepted: 08/24/2017] [Indexed: 11/16/2022] Open
Abstract
Recently, IL/cosolvent systems have generated a lot of interest as cellulose-dissolving solvents and reaction media for various kinds of cellulose modification. In the present study, both 1-allyl-3-methylimidazolium chloride (AmimCl)/dimethyl sulfoxide (DMSO) and AmimCl/N,N-dimethylformamide (DMF) systems were employed to synthesize cellulose acetate by transesterification. Microcrystalline cellulose, 1,8-diazabicyclo[5.4.0]undec-7-ene and isopropenyl acetate were chosen as the raw material, catalyst and acetylation reagent, respectively. The results revealed that DMSO was a suitable cosolvent for the transesterification in the homogeneous solution. Moreover, DMSO had a positive effect on the reaction as the cosolvent under the given conditions and the degree of the substitution of cellulose acetate could be significantly enhanced through increasing the molar ratio of DMSO. The synthesized products were characterized by Fourier transform infrared (FT-IR) spectroscopy, 1H and 13C nuclear magnetic resonance spectroscopy (1H-NMR and 13C-NMR), correlation spectroscopy (COSY), heteronuclear single quantum correlation (HSQC) spectroscopy, and X-ray diffraction (XRD) to confirm the chemical and physical structure of the cellulose acetate generated. The thermal properties were also evaluated using thermogravimetric analysis (TGA)/derivative thermogravimetry (DTG).
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Affiliation(s)
- Huihui Wang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Xiaoxiang Wen
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Xueqin Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Chuanfu Liu
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
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19
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Wang M, Xu X, Ge Y, Dong P, Baines R, Ajayan PM, Ye M, Shen J. Surface Tension Components Ratio: An Efficient Parameter for Direct Liquid Phase Exfoliation. ACS Appl Mater Interfaces 2017; 9:9168-9175. [PMID: 28240533 DOI: 10.1021/acsami.6b16578] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Direct liquid phase exfoliation (LPE) is generally regarded as an effective and efficient methodology for preparing single- to few-layered nanosheets on a large scale. Based on a previous finding that the polar and dispersive components of surface tension can be used as critical parameters for screening suitable solvents for LPE, in this study, we conducted in-depth research on direct LPE of two-dimensional (2D) materials by the extensive LPE of a series of 2D materials and the thorough comparison of their surfaces properties and LPE efficiencies. We rationally developed the surface tension component matching (STCM) theory, and in nature, its key point lies in the close ratio of polar to dispersive components (P/D) between the solvents and the aimed 2D materials. To this end, the surface tension components ratio is demonstrated to be an effective parameter for screening LPE solvents. In addition to the optimization of the LPE process for these 2D materials, this work has further greatly enlarged the comprehensive library for the solvent and 2D material matching pairs based on the improved STCM theory.
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Affiliation(s)
- Man Wang
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Xiaowei Xu
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Yuancai Ge
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Pei Dong
- Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States
| | - Robert Baines
- Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States
| | - Pulickel M Ajayan
- Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States
| | - Mingxin Ye
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Jianfeng Shen
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
- Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States
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20
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Boley JW, Hyun SH, White EL, Thompson DH, Kramer RK. Hybrid Self-Assembly during Evaporation Enables Drop-on-Demand Thin Film Devices. ACS Appl Mater Interfaces 2016; 8:34171-34178. [PMID: 27008567 DOI: 10.1021/acsami.5b12687] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We propose and demonstrate a hybrid self-assembly process as the mechanism for producing strikingly uniform deposits from evaporating drops composed of cosolvents. This assembly process leverages both particle-fluid interactions to carry the particles to the drop surface and particle-interface interactions to assemble the particles into a uniform film. We anchor our results in a cosolvent evaporation model that agrees with our experimental observations. We further employ the process to produce thin film devices such as flexible broadband neutral density filters and semitransparent mirrors. Our observations suggest that this assembly process is free of particle-substrate interactions, which indicates that the results should be transferable across a multitude of material/substrate systems.
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Affiliation(s)
- J William Boley
- School of Mechanical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Seok-Hee Hyun
- Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States
| | - Edward L White
- School of Mechanical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - David H Thompson
- Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States
| | - Rebecca K Kramer
- School of Mechanical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
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21
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Wei T, Yang K, Bai B, Zang J, Yu X, Mao D. Enzymatic Hydrolytic Resolution of Racemic Ibuprofen Ethyl Ester Using an Ionic Liquid as Cosolvent. Molecules 2016; 21:E905. [PMID: 27420042 DOI: 10.3390/molecules21070905] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Revised: 06/27/2016] [Accepted: 07/07/2016] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to develop an ionic liquid (IL) system for the enzymatic resolution of racemic ibuprofen ethyl ester to produce (S)-ibuprofen. Nineteen ILs were selected for use in buffer systems to investigate the effects of ILs as cosolvents for the production of (S)-ibuprofen using thermostable esterase (EST10) from Thermotoga maritima. Analysis of the catalytic efficiency and conformation of EST10 showed that [OmPy][BF₄] was the best medium for the EST10-catalyzed production of (S)-ibuprofen. The maximum degree of conversion degree (47.4%), enantiomeric excess of (S)-ibuprofen (96.6%) and enantiomeric ratio of EST10 (177.0) were achieved with an EST10 concentration of 15 mg/mL, racemic ibuprofen ethyl ester concentration of 150 mM, at 75 °C , with a reaction time of 10 h. The reaction time needed to achieve the highest yield of (S)-ibuprofen was decreased from 24 h to 10 h. These results are relevant to the proposed application of ILs as solvents for the EST10-catalyzed production of (S)-ibuprofen.
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Abstract
PEG-400, polysorbate 80, and 2 CDs (Trappsol HPB and Captisol) were used in an attempt to improve the aqueous solubility of a model hydrophobic drug, progesterone. The aqueous solubility of progesterone improved significantly from 0.007 mg/mL by the addition of PEG-400, CDs, and polysorbate 80. In systems containing various amounts of PEG-400 and 3% Trappsol HPB in water (% wt/wt), the theoretical solubility was calculated by adding the solubilities in the individual systems. The observed solubility values were up to 96% higher than the theoretical values. The effect of synergism was significant in 5% to 50% PEG-400/water systems containing Trappsol HPB. Systems containing Captisol did not show such synergistic effects. In general, the addition of polysorbate 80 to the PEG-400/water systems containing CDs affected synergism negatively.
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Affiliation(s)
- Indranil Nandi
- Geneva Pharmaceutical Technology Corp, 2400 Route 130 North, 08810 Dayton, NJ
| | | | - Mohammad Bari
- Forest Laboratories Inc, 330 Prospect Street, 11096 Inwood, NY
| | - Hemant N. Joshi
- Barr Laboratories, Pharmaceutical Research & Development, 2 Quaker Road, 10970 Pomona, NY
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Abstract
Organic co-solvent-induced secondary conformation of alpha(17-40) of human hemoglobin facilitates the splicing of E30-R31 in a mixture of its complementary segments by V8 protease. The amino acid sequence of alpha(17-40) has been conceptualized by the general structure FR(I)-EALER-FR(II) and the pentapeptide sequence EALER playing a major role in inducing the alpha-helical conformation. The primary structure of alpha(17-40) has been engineered in multiple ways to perturb one, two, or all three regions and the influence of the organic co-solvent-induced conformation and the concomitant resistance of E30-R31 peptide bond to V8 protease digestion has been investigated. The central pentapeptide (EALER), referred to here as splicedon,(3) appears to dictate a primary role in facilitating the splicing reaction. When the same flanking regions are used, (1) splicedons that carry amino acid residues of low alpha-helical potential, for example G at position 2 or 3 of the splicedon, generate a conformational trap of very low thermodynamic stability, giving an equilibrium yield of only 3%-5%; (2) splicedons with amino acid residues of good alpha-helical potential generate a conformational trap of medium thermodynamic stability and give an equilibrium yield of 20%-25%; (3) the splicedons with amino residues of good alpha-helical potential and also an amino acid that can generate an i, i + 4 side-chain carboxylate-guanidino (amino) interaction, a conformational trap of maximum thermodynamic stability is generated, giving an equilibrium yield of 45%-50%; and (4) the thermodynamic stability of the conformational trap of the spliced peptide is also influenced by the amino acid composition of the flanking regions. The V8 protease resistance of the spliced peptide bond is not a direct correlate of the amount of alpha-helical conformation induced into the product. The results of this study reflect the unique role of the splicedon in translating the organic co-solvent-induced product conformation as a site-specific stabilization of the spliced peptide bond. It is speculated that the splicedon with higher alpha-helical potential as compared to either one of the flanking regions achieves this by integrating its potential with that of the flanking region(s). Exchange of flanking regions with the products of other V8 protease-catalyzed splicing reactions will help to establish the general primary structural requirements of this class of splicing reactions and facilitate their application in modular construction of proteins.
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Affiliation(s)
- Sonati Srinivasulu
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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