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Cajiao Checchin V, Cacciari RD, Rubert AA, Lieblich M, Caregnato P, Fagali NS, Fernández Lorenzo de Mele M. Innovative Anodic Treatment to Obtain Stable Metallic Silver Micropatches on TiO 2 Nanotubes: Structural, Electrochemical, and Photochemical Properties. ACS OMEGA 2024; 9:9644-9654. [PMID: 38434842 PMCID: PMC10905698 DOI: 10.1021/acsomega.3c09687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/09/2024] [Accepted: 01/15/2024] [Indexed: 03/05/2024]
Abstract
Electrochemical modification of the Ti surface to obtain TiO2 nanotubes (NT-Ti) has been proposed to enhance osseointegration in medical applications. However, susceptibility to microbial adhesion, linked to biomaterial-associated infections, and the high TiO2 band gap energy, which allows light absorption almost exclusively in the ultraviolet (UV) region, limit its applications. Modifying the TiO2 semiconductor with metals such as Ag has been suggested both for antimicrobial purposes and for absorbing light in the visible region. The formation of NT-Ti with Ag micropatches (Ag-NT-Ti) is pursued with the objective of enhancing the stability of the deposits and preventing cytotoxic levels of Ag cellular uptake. The innovative process proposed here involves immersing NT-Ti in a AgNO3 solution as the initial step. Diverging from previously reported electrochemical methods, this process incorporates anodization within the TiO2 oxide formation region instead of cathodic reduction generally employed by other researchers. The final step encompasses an annealing treatment. The treatments result in the in situ Ag1+ reduction and formation of stable and active micropatches of metallic Ag on the NT-Ti surface. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman, diffuse reflectance spectroscopy (DRS), wettability assessment, and electrochemical characterizations were conducted to evaluate the modified surfaces. The well-known properties of NT-Ti surfaces were enhanced, leading to improved photocatalytic activity across both visible and UV regions, significant stability against detachment, and controlled release of Ag1+ for promising antimicrobial effects.
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Affiliation(s)
- Valentina
C. Cajiao Checchin
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas
(INIFTA), CCT La Plata, CONICET, Facultad de Ciencias Exactas, UNLP, C.C. 16 Suc. 4, 1900 La Plata, Argentina
| | - Rodolfo D. Cacciari
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas
(INIFTA), CCT La Plata, CONICET, Facultad de Ciencias Exactas, UNLP, C.C. 16 Suc. 4, 1900 La Plata, Argentina
| | - Aldo A. Rubert
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas
(INIFTA), CCT La Plata, CONICET, Facultad de Ciencias Exactas, UNLP, C.C. 16 Suc. 4, 1900 La Plata, Argentina
| | - Marcela Lieblich
- Centro
Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), 28040 Madrid, Spain
| | - Paula Caregnato
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas
(INIFTA), CCT La Plata, CONICET, Facultad de Ciencias Exactas, UNLP, C.C. 16 Suc. 4, 1900 La Plata, Argentina
| | - Natalia S. Fagali
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas
(INIFTA), CCT La Plata, CONICET, Facultad de Ciencias Exactas, UNLP, C.C. 16 Suc. 4, 1900 La Plata, Argentina
| | - Mónica Fernández Lorenzo de Mele
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas
(INIFTA), CCT La Plata, CONICET, Facultad de Ciencias Exactas, UNLP, C.C. 16 Suc. 4, 1900 La Plata, Argentina
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Tunioli F, Marforio TD, Favaretto L, Mantovani S, Pintus A, Bianchi A, Kovtun A, Agnes M, Palermo V, Calvaresi M, Navacchia ML, Melucci M. Chemical Tailoring of β-Cyclodextrin-Graphene Oxide for Enhanced Per- and Polyfluoroalkyl Substances (PFAS) Adsorption from Drinking Water. Chemistry 2023; 29:e202301854. [PMID: 37548167 DOI: 10.1002/chem.202301854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/05/2023] [Accepted: 08/07/2023] [Indexed: 08/08/2023]
Abstract
We report on the synthesis of β-cyclodextrin (βCD) modified graphene oxide (GO) nanosheets, having different sized alkyl linkers (GO-Cn -βCD) and their exploitation as sorbent of per- and polyfluoroalkyl substances (PFAS) from drinking water. βCD were functionalized with a pending amino group, and the resulting precursors grafted to GO nanosheets by epoxide ring opening reaction. Loading of βCD units in the range 12 %-36 % was estimated by combined XPS and elemental analysis. Adsorption tests on perfluorobutanoic acid (PFBA), a particularly persistent PFAS selected as case study, revealed a strong influence of the alkyl linker length on the adsorption efficiency, with the hexyl linker derivative GO-C6 -βCD outperforming both pristine GO and granular activated carbon (GAC), the standard sorbent benchmark. Molecular dynamic simulations ascribed this evidence to the favorable orientation of the βCD unit on the surface of GO which enables a strong contaminant molecules retention.
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Affiliation(s)
- Francesca Tunioli
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Tainah D Marforio
- Department of Chemistry "G. Ciamician" Alma Mater Studiorum -, University of Bologna, Via Selmi 2, 40126, Bologna, BO, Italy
| | - Laura Favaretto
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Sebastiano Mantovani
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Angela Pintus
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Antonio Bianchi
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Alessandro Kovtun
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Marco Agnes
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Vincenzo Palermo
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
- Department of Industrial and Materials Science, Chalmers University of Technology, 41258, Göteborg, Sweden
| | - Matteo Calvaresi
- Department of Chemistry "G. Ciamician" Alma Mater Studiorum -, University of Bologna, Via Selmi 2, 40126, Bologna, BO, Italy
| | - Maria Luisa Navacchia
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
| | - Manuela Melucci
- Institute for Organic Synthesis and Photoreactivity (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129, Bologna, BO, Italy
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Chen R, Qian L, Xu S, Wan S, Ma M, Zhang L, Jiang R. In Situ Fabrication of CdS/Cd(OH) 2 for Effective Visible Light-Driven Photocatalysis. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2453. [PMID: 37686961 PMCID: PMC10490156 DOI: 10.3390/nano13172453] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 08/27/2023] [Accepted: 08/28/2023] [Indexed: 09/10/2023]
Abstract
Photocatalytic hydrogen production is a promising technology that can generate renewable energy. However, light absorption and fast electron transfer are two main challenges that restrict the practical application of photocatalysis. Moreover, most of the composite photocatalysts that possess better photocatalytic performance are fabricated by various methods, many of which are complicated and in which, the key conditions are hard to control. Herein, we developed a simple method to prepare CdS/Cd(OH)2 samples via an in situ synthesis approach during the photocatalytic reaction process. The optimal hydrogen generation rate of CdS/Cd(OH)2 that could be obtained was 15.2 mmol·h-1·g-1, greater than that of CdS, which generates 2.6 mmol·h-1·g-1 under visible light irradiation. Meanwhile, the CdS-3 sample shows superior HER performance during recycling tests and exhibits relatively steady photocatalytic performance in the 10 h experiment. Expanded absorption of visible light, decreased recombination possibility for photo-induced carriers and a more negative conduction band position are mainly responsible for the enhanced photocatalytic hydrogen evolution performance. Photo-induced electrons will be motivated to the conduction band of CdS under the irradiation of visible light and will further transfer to Cd(OH)2 to react with H+ to produce H2. The in situ-formed Cd(OH)2 could effectively facilitate the electron transfer and reduce the recombination possibility of photo-generated electron-hole pairs.
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Affiliation(s)
- Ran Chen
- Key Laboratory of Environmental Detection and Pollution Prevention, College of Life & Environmental Sciences, Huangshan University, Huangshan 245041, China; (R.C.); (L.Q.); (S.X.); (S.W.); (M.M.)
| | - Liping Qian
- Key Laboratory of Environmental Detection and Pollution Prevention, College of Life & Environmental Sciences, Huangshan University, Huangshan 245041, China; (R.C.); (L.Q.); (S.X.); (S.W.); (M.M.)
| | - Shengyou Xu
- Key Laboratory of Environmental Detection and Pollution Prevention, College of Life & Environmental Sciences, Huangshan University, Huangshan 245041, China; (R.C.); (L.Q.); (S.X.); (S.W.); (M.M.)
| | - Shunli Wan
- Key Laboratory of Environmental Detection and Pollution Prevention, College of Life & Environmental Sciences, Huangshan University, Huangshan 245041, China; (R.C.); (L.Q.); (S.X.); (S.W.); (M.M.)
| | - Minghai Ma
- Key Laboratory of Environmental Detection and Pollution Prevention, College of Life & Environmental Sciences, Huangshan University, Huangshan 245041, China; (R.C.); (L.Q.); (S.X.); (S.W.); (M.M.)
| | - Lei Zhang
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Runren Jiang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
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He PS, Tran DP, Kuo TY, Hsu WY, Lin HE, Shie KC, Chen C. High-Bonding-Strength Polyimide Films Achieved via Thermal Management and Surface Activation. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091575. [PMID: 37177120 PMCID: PMC10180403 DOI: 10.3390/nano13091575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 04/26/2023] [Accepted: 05/06/2023] [Indexed: 05/15/2023]
Abstract
In this study, thermal and argon (Ar) plasma/wetting treatments were combined to enhance the bonding strength of polyimide (PI) films. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) was used to analyze the changes in the PI imidization degrees. The contact angles of the PI films were also measured. The results show that the contact angles of the fully cured PI films markedly decreased from 78.54° to 26.05° after the Ar plasma treatments. X-ray photoelectron spectroscopy (XPS) analysis was also conducted on the PI surfaces. We found that the intensities of the C-OH and C-N-H bonds increased from 0% to 13% and 29% to 57%, respectively, after Ar plasma activation. Such increases in the C-OH and C-N-H intensities could be attributed to the generation of dangling bonds and the breakage of the imide ring or polymer long chains. Shear tests were also conducted to characterize the bonding strength of the PI films, which, after being treated with the appropriate parameters of temperature, plasma power, and wetting droplets, was found to be excellent at greater than 35.3 MPa.
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Affiliation(s)
- Pin-Syuan He
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Dinh-Phuc Tran
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Ting-Yu Kuo
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Wei-You Hsu
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Huai-En Lin
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Kai-Cheng Shie
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Chih Chen
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
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Frías-Ureña PM, Bárcena-Soto M, Orozco-Guareño E, Gutiérrez-Becerra A, Mota-Morales JD, Chavez K, Soto V, Rivera-Mayorga JA, Escalante-Vazquez JI, Gómez-Salazar S. Porous Structural Properties of K or Na-Co Hexacyanoferrates as Efficient Materials for CO 2 Capture. MATERIALS (BASEL, SWITZERLAND) 2023; 16:608. [PMID: 36676342 PMCID: PMC9863694 DOI: 10.3390/ma16020608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 12/23/2022] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
The stoichiometry of the components of hexacyanoferrate materials affecting their final porosity properties and applications in CO2 capture is an issue that is rarely studied. In this work, the effect that stoichiometry of all element components and oxidation states of transition metals has on the structures of mesoporous K or Na-cobalt hexacyanoferrates (CoHCFs) and CO2 removal is reported. A series of CoHCFs model systems are synthesized using the co-precipitation method with varying amounts of Co ions. CoHCFs are characterized by N2 adsorption, TGA, FTIR-ATR, XRD, and XPS. N2 adsorption results reveal a more developed external surface area (72.69-172.18 m2/g) generated in samples containing mixtures of K+/Fe2+/Fe3+ ions (system III) compared to samples with Na+/Fe2+ ions (systems I, II). TGA results show that the porous structure of CoHCFs is affected by Fe and Co ions oxidation states, the number of water molecules, and alkali ions. The formation of two crystalline cells (FCC and triclinic) is confirmed by XRD results. Fe and Co oxidation states are authenticated by XPS and allow for the confirmation of charges involved in the stabilization of CoCHFs. CO2 removal capacities (3.04 mmol/g) are comparable with other materials reported. CO2 adsorption kinetics is fast (3-6 s), making CoHCFs attractive for continuous operations. Qst (24.3 kJ/mol) reveals a physical adsorption process. Regeneration effectiveness for adsorption/desorption cycles indicates ~1.6% loss and selectivity (~47) for gas mixtures (CO2:N2 = 15:85). The results of this study demonstrate that the CoHCFs have practical implications in the potential use of CO2 capture and flue gas separations.
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Affiliation(s)
- Paloma M. Frías-Ureña
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - Maximiliano Bárcena-Soto
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - Eulogio Orozco-Guareño
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - Alberto Gutiérrez-Becerra
- Departamento de Ciencias Básicas y Aplicadas, Universidad de Guadalajara (CUTonala), Avenue Nuevo Periférico 555, Tonalá 45425, Mexico
| | - Josué D. Mota-Morales
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de Mexico, Querétaro 76230, Mexico
| | - Karina Chavez
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - Víctor Soto
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
- Graduate Program in Materials Science, Departamento de Ingeniería de Proyectos, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - José A. Rivera-Mayorga
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - José I. Escalante-Vazquez
- Departamento de Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
| | - Sergio Gómez-Salazar
- Departamento de Ingeniería Química, Universidad de Guadalajara (CUCEI), Boulevard Marcelino García Barragán #1421, Esquina Calzada Olímpica, Guadalajara 44430, Mexico
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Covalent Modification of Iron Phthalocyanine into Skeleton of Graphitic Carbon Nitride and Its Visible-Light-Driven Photocatalytic Reduction of Nitroaromatic Compounds. Catalysts 2022. [DOI: 10.3390/catal12070752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
It is of great urgency to eliminate nitroaromatic compounds (NACs) in wastewater due to their high residue and toxicity. Photocatalysis reduction is considered to be an efficient technology for converting NACs to their corresponding aromatic amines. In this work, a visible-light-driven hybrid photocatalyst was synthesized by covalently doping Fe phthalocyanine (FePc) into graphitic carbon nitride skeleton. Compared to the pristine gCN, the optimized gCN-FePc-1 photocatalyst showed enhanced absorption in visible light region, which promoted photogenerated charge transfer and separation. Using p-nitrophenol (p-NP) as the model pollutant, the CN-FePc-1 effectively reduced it to p-aminophenol (p-AP), with the photocatalytic reaction rate being 18 and 3 times higher, respectively, than those of the pristine gCN and the mechanically mixed photocatalyst of gCN/FePc. Moreover, excellent photocatalytic universality for other NACs, high stability, and good reusability also were confirmed. Based on the band structure of the gCN-FePc-1 photocatalyst, a plausible mechanism was proposed to illustrate the photocatalytic reduction process of p-NP to p-AP. This study demonstrates that the covalent modification of FePc into gCN skeleton is an effective strategy to modulate the electronic structure, and the hybrid gCN-FePc is a potential visible-light-driven photocatalyst that potentially can be used for eliminating NAC contamination in wastewater.
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Xu H, Wang Y, Zhao D, Chen N, Tan L, Feng H. Based on TRIZ Methodology Design and Preparation of a Robust Skeletal Superhydrophobic Perfluoropolysiloxane and Polyaniline/Epoxy Resin Composite Coating with Outstanding Anti-Corrosion Performance. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Haidong Xu
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Youliang Wang
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Dan Zhao
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Nali Chen
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Lin Tan
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Huixia Feng
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
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Xu H, Zhang L, Wang L, Lu Y, Feng H. A Robust Superhydrophobic/Conductive Composite Coating with Excellent Anticorrosive Performance. ChemistrySelect 2021. [DOI: 10.1002/slct.202101043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Haidong Xu
- College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China
| | - Liang Zhang
- College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China
| | - Luyao Wang
- College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China
| | - Yong Lu
- College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China
| | - Huixia Feng
- College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China
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Xu H, Miao C, Wang L, Zhang L, Feng H, Qiu J. A Robust Superhydrophobic Perfluoropolysiloxane and Self-doped Polyaniline/Epoxy Resin Composite Coating with Excellent Performance. CHEM LETT 2021. [DOI: 10.1246/cl.210343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Haidong Xu
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Congcong Miao
- School of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Luyao Wang
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Liang Zhang
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Huixia Feng
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
| | - Jianhui Qiu
- Faculty of Systems Science and Technology, Akita Prefectural University, Yurihonjo, Akita 015-0055, Japan
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Qi JL, Xu QQ, Zhou D, Yin JZ, Jiang QK. Preparation of Cu single atoms on N-doped carbon materials with supercritical CO2 deposition. J Supercrit Fluids 2021. [DOI: 10.1016/j.supflu.2021.105202] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Tarnawska D, Balin K, Jastrzębska M, Talik A, Wrzalik R. Physicochemical Analysis of Sediments Formed on the Surface of Hydrophilic Intraocular Lens after Descemet's Stripping Endothelial Keratoplasty. MATERIALS 2020; 13:ma13184145. [PMID: 32957729 PMCID: PMC7560278 DOI: 10.3390/ma13184145] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 09/12/2020] [Accepted: 09/14/2020] [Indexed: 11/29/2022]
Abstract
An intraocular lens (IOL) is a synthetic, artificial lens placed inside the eye that replaces a natural lens that is surgically removed, usually as part of cataract surgery. The opacification of the artificial lens can be related to the formation of the sediments on its surface and could seriously impair vision. The physicochemical analysis was performed on an explanted hydrophilic IOL and compared to the unused one, considered as a reference IOL. The studies were carried out using surface sensitive techniques, which can contribute to a better understanding of the sedimentation process on hydrophilic IOLs’ surfaces. The microscopic studies allowed us to determine the morphology of sediments observed on explanted IOL. The photoelectron spectroscopy measurements revealed the presence of organic and inorganic compounds at the lens surface. Mass spectroscopy measurements confirmed the chemical composition of deposits and allowed for chemical imaging of the IOL surface. Applied techniques allowed to obtain a new set of information approximating the origin of the sediments’ formation on the surface of the hydrophilic IOLs after Descemet’s stripping endothelial keratoplasty.
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Affiliation(s)
- Dorota Tarnawska
- Institute of Biomedical Engineering, Faculty of Science and Technology, University of Silesia, 41-200 Sosnowiec, Poland;
- Department of Ophthalmology, District Railway Hospital, Panewnicka 65, 40-760 Katowice, Poland
| | - Katarzyna Balin
- August Chełkowski Institute of Physics, Faculty of Science and Technology, University of Silesia, 41-500 Chorzów, Poland; (M.J.); (A.T.); (R.W.)
- Correspondence:
| | - Maria Jastrzębska
- August Chełkowski Institute of Physics, Faculty of Science and Technology, University of Silesia, 41-500 Chorzów, Poland; (M.J.); (A.T.); (R.W.)
| | - Agnieszka Talik
- August Chełkowski Institute of Physics, Faculty of Science and Technology, University of Silesia, 41-500 Chorzów, Poland; (M.J.); (A.T.); (R.W.)
| | - Roman Wrzalik
- August Chełkowski Institute of Physics, Faculty of Science and Technology, University of Silesia, 41-500 Chorzów, Poland; (M.J.); (A.T.); (R.W.)
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Gericke SM, Mulhearn WD, Goodacre DE, Raso J, Miller DJ, Carver L, Nemšák S, Karslıoğlu O, Trotochaud L, Bluhm H, Stafford CM, Buechner C. Water-polyamide chemical interplay in desalination membranes explored by ambient pressure X-ray photoelectron spectroscopy. Phys Chem Chem Phys 2020; 22:15658-15663. [PMID: 32618298 PMCID: PMC7671007 DOI: 10.1039/d0cp01842b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reverse osmosis using aromatic polyamide membranes is currently the most important technology for seawater desalination. The performance of reverse osmosis membranes is highly dependent on the interplay of their surface chemical groups with water and water contaminants. In order to better understand the underlying mechanisms of these membranes, we study ultrathin polyamide films that chemically resemble reverse osmosis membranes, using ambient pressure X-ray photoelectron spectroscopy. This technique can identify the functional groups at the membrane-water interface and allows monitoring of small shifts in the electron binding energy that indicate interaction with water. We observe deprotonation of free acid groups and formation of a 'water complex' with nitrogen groups in the polymer upon exposure of the membrane to water vapour. The chemical changes are reversed when water is removed from the membrane. While the correlation between functional groups and water uptake is an established one, this experiment serves to understand the nature of their chemical interaction, and opens up possibilities for tailoring future materials to specific requirements.
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Affiliation(s)
- Sabrina M Gericke
- Chemical Sciences Division and Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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Xu B, Maimaiti H, Wang S, Zhai P, Zhang H. Direct photocatalytic synthesis of N2/H2O to ammonia by plasmonic metal Pt supported on coal based graphene oxide/silica dioxide. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01802-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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14
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Buechner C, Gericke SM, Trotochaud L, Karslıoǧlu O, Raso J, Bluhm H. Quantitative Characterization of a Desalination Membrane Model System by X-ray Photoelectron Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11315-11321. [PMID: 31398039 DOI: 10.1021/acs.langmuir.9b01838] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Aromatic polyamide films form the active layer in reverse osmosis desalination membranes. Despite widespread use of this technology, it suffers from low rejection rates for certain water contaminants and from membrane fouling. Through a better understanding of the fundamental surface chemical processes during reverse osmosis desalination, advances in membrane and material design are expected. The recent invention of a molecular layer-by-layer (mLbL) preparation technique [ Johnson , P. M. ; Molecular Layer-by-Layer Deposition of Highly Crosslinked Polyamide Films . J. Polym. Sci., Part B: Polym. Phys. 2012 , 50 ( 3 ), 168 - 173 ] yields films that are sufficiently smooth to warrant investigation with high-resolution microscopy and spectroscopy methods. We present high-resolution, quantitative X-ray photoelectron spectroscopy (XPS) data on the surface chemistry of ultrathin polyamide films that can serve as a model system for desalination membranes. We show that a quantitative analysis of the XPS spectra gives information about the functional groups of the film as well as other compounds present due to the synthesis under ambient conditions. Unpolymerized functional groups are identified and aid in understanding the degree of cross-linking. Investigation of polymers with synchrotron-based XPS requires taking beam-induced changes into account. We quantify X-ray beam damage and show that beam damage to the polyamide is limited, allowing long-term investigation of thin polyamide films. Characterizing mLbL-grown films via high-resolution XPS is the basis for a better understanding of the chemical interplay of polyamide surface functional groups with the major components of desalination systems.
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Karakhanov E, Maximov A, Zolotukhina A. Selective semi-hydrogenation of phenyl acetylene by Pd nanocatalysts encapsulated into dendrimer networks. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.03.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Alessio Verni G, Long B, Gity F, Lanius M, Schüffelgen P, Mussler G, Grützmacher D, Greer J, Holmes JD. Oxide removal and stabilization of bismuth thin films through chemically bound thiol layers. RSC Adv 2018; 8:33368-33373. [PMID: 35548121 PMCID: PMC9086459 DOI: 10.1039/c8ra06840b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 09/10/2018] [Indexed: 12/03/2022] Open
Abstract
Bismuth has been identified as a material of interest for electronic applications due to its extremely high electron mobility and quantum confinement effects observed at nanoscale dimensions. However, it is also the case that Bi nanostructures are readily oxidised in ambient air, necessitating additional capping steps to prevent surface re-oxidation, thus limiting the processing potential of this material. This article describes an oxide removal and surface stabilization method performed on molecular beam epitaxy (MBE) grown bismuth thin-films using ambient air wet-chemistry. Alkanethiol molecules were used to dissolve the readily formed bismuth oxides through a catalytic reaction; the bare surface was then reacted with the free thiols to form an organic layer which showed resistance to complete reoxidation for up to 10 days.
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Affiliation(s)
- Giuseppe Alessio Verni
- School of Chemistry, University College Cork Cork T12 P2FY Ireland
- Tyndall National Institute, University College Cork Cork T12 PX46 Ireland
- AMBER@CRANN, Trinity College Dublin Dublin 2 Ireland
| | - Brenda Long
- School of Chemistry, University College Cork Cork T12 P2FY Ireland
- Tyndall National Institute, University College Cork Cork T12 PX46 Ireland
- AMBER@CRANN, Trinity College Dublin Dublin 2 Ireland
| | - Farzan Gity
- Tyndall National Institute, University College Cork Cork T12 PX46 Ireland
| | - Martin Lanius
- Peter Grünberg Institute 9, Jülich Aachen Research Alliance (JARA-FIT), Research Center Jülich Germany
| | - Peter Schüffelgen
- Peter Grünberg Institute 9, Jülich Aachen Research Alliance (JARA-FIT), Research Center Jülich Germany
| | - Gregor Mussler
- Peter Grünberg Institute 9, Jülich Aachen Research Alliance (JARA-FIT), Research Center Jülich Germany
| | - Detlev Grützmacher
- Peter Grünberg Institute 9, Jülich Aachen Research Alliance (JARA-FIT), Research Center Jülich Germany
| | - Jim Greer
- Tyndall National Institute, University College Cork Cork T12 PX46 Ireland
- Faculty of Science and Engineering, University of Nottingham Ningbo China Ningbo China
| | - Justin D Holmes
- School of Chemistry, University College Cork Cork T12 P2FY Ireland
- Tyndall National Institute, University College Cork Cork T12 PX46 Ireland
- AMBER@CRANN, Trinity College Dublin Dublin 2 Ireland
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Azo compounds as a family of organic electrode materials for alkali-ion batteries. Proc Natl Acad Sci U S A 2018; 115:2004-2009. [PMID: 29440381 DOI: 10.1073/pnas.1717892115] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Organic compounds are desirable for sustainable Li-ion batteries (LIBs), but the poor cycle stability and low power density limit their large-scale application. Here we report a family of organic compounds containing azo group (N=N) for reversible lithiation/delithiation. Azobenzene-4,4'-dicarboxylic acid lithium salt (ADALS) with an azo group in the center of the conjugated structure is used as a model azo compound to investigate the electrochemical behaviors and reaction mechanism of azo compounds. In LIBs, ADALS can provide a capacity of 190 mAh g-1 at 0.5 C (corresponding to current density of 95 mA g-1) and still retain 90%, 71%, and 56% of the capacity when the current density is increased to 2 C, 10 C, and 20 C, respectively. Moreover, ADALS retains 89% of initial capacity after 5,000 cycles at 20 C with a slow capacity decay rate of 0.0023% per cycle, representing one of the best performances in all organic compounds. Superior electrochemical behavior of ADALS is also observed in Na-ion batteries, demonstrating that azo compounds are universal electrode materials for alkali-ion batteries. The highly reversible redox chemistry of azo compounds to alkali ions was confirmed by density-functional theory (DFT) calculations. It provides opportunities for developing sustainable batteries.
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Liu H, Lv H, Kan K, Liu Y, Zhang W, Wang Y, Ikram M, Du L, Shi K, Yu HT. Biocarbon-templated synthesis of porous Ni–Co-O nanocomposites for room-temperature NH3 sensors. NEW J CHEM 2018. [DOI: 10.1039/c8nj03832e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Mesoporous nickel–cobalt oxide (Ni–Co-O) nanocomposites were fabricated using a mesoporous biocarbon material (BCM), resulting from hemp stem, as a template.
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Affiliation(s)
- Huan Liu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
| | - He Lv
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
| | - Kan Kan
- Daqing Branch
- Heilongjiang Academy of Sciences
- Daqing 163319
- China
- Institute of Advanced Technology
| | - Yang Liu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
| | - Weijun Zhang
- Institute of Advanced Technology
- Heilongjiang Academy of Science
- Harbin, 150080
- China
| | - Yang Wang
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
| | - Muhammad Ikram
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
| | - Lijuan Du
- Harbin Normal University
- Harbin 150025
- China
| | - Keying Shi
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
| | - Hai-tao Yu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Material Science
- Heilongjiang University
- Harbin
- China
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Jalil WBF, Pentón-Madrigal A, Mello A, Carneiro FA, Soares RM, Baptista LS, Sinnecker JP, de Oliveira LAS. Low toxicity superparamagnetic magnetite nanoparticles: One-pot facile green synthesis for biological applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 78:457-466. [PMID: 28576009 DOI: 10.1016/j.msec.2017.04.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 04/07/2017] [Accepted: 04/12/2017] [Indexed: 10/19/2022]
Abstract
Superparamagnetic magnetite nanoparticles have been synthesized by a highly reproducible polyvinyl alcohol (PVA)-based modified sol-gel process using water as the only solvent. The synthesis method has proven to be effective, time and cost saving and environmental friendly, resulting in PVA-coated magnetite nanoparticles as direct product from the synthesis, without any special atmosphere or further thermal treatment. X-ray diffraction and transmission electron microscopy revealed that the biocompatible PVA-coating prevents the nanoparticle agglomeration, giving rise to spherical crystals with sizes of 6.8nm (as-cast) and 9.5nm (heat treated) with great control over size and shape with narrow size distribution. Complementary compositional and magnetic characterizations were employed in order to study the surface chemistry and magnetic behavior of the samples, respectively. Cytotoxicity endpoints including no observed adverse effect concentration (NOAEC), 50% lethal concentration (LC50) and total lethal concentration (TLC) of the tested materials on cell viability were determined after 3, 24 and 48h of exposure. The PVA coating improved the biocompatibility of the synthesized magnetite nanoparticles showing good cell viability and low cytotoxicity effects on the MTT assay performed on BHK cells. Preliminary assessment of nanoparticles in vivo effects, performed after 48h on Balb/c mice, exposed to a range of different sub-lethal doses, showed their capacity to penetrate in liver and kidneys with no significant morphological alterations in both organs.
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Affiliation(s)
- W B F Jalil
- Núcleo Multidisciplinar de Pesquisas em Nanotecnologia - NUMPEX-NANO, Polo Xerém, Universidade Federal do Rio de Janeiro, Est. de Xerém 27, 25245-390 Duque de Caxias, RJ, Brazil
| | - A Pentón-Madrigal
- Facultad de Física, IMRE, Universidad de La Habana, San Lazaro y L, C. Habana CP 10400, Cuba
| | - A Mello
- Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, Brazil
| | - F A Carneiro
- Núcleo Multidisciplinar de Pesquisas em Biologia - NUMPEX-BIO, Polo Xerém, Universidade Federal do Rio de Janeiro, Est. de Xerém 27, 25245-390 Duque de Caxias, RJ, Brazil
| | - R M Soares
- Núcleo Multidisciplinar de Pesquisas em Biologia - NUMPEX-BIO, Polo Xerém, Universidade Federal do Rio de Janeiro, Est. de Xerém 27, 25245-390 Duque de Caxias, RJ, Brazil
| | - L S Baptista
- Núcleo Multidisciplinar de Pesquisas em Biologia - NUMPEX-BIO, Polo Xerém, Universidade Federal do Rio de Janeiro, Est. de Xerém 27, 25245-390 Duque de Caxias, RJ, Brazil
| | - J P Sinnecker
- Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, Brazil
| | - L A S de Oliveira
- Núcleo Multidisciplinar de Pesquisas em Nanotecnologia - NUMPEX-NANO, Polo Xerém, Universidade Federal do Rio de Janeiro, Est. de Xerém 27, 25245-390 Duque de Caxias, RJ, Brazil.
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Gao W, Li J, Yan X, Zhu B, Jia J, Huang A, Xie K, Bai Y. Accordion-like graphene by a facile and green synthesis method reinforcing polyolefin nanocomposites. RSC Adv 2017. [DOI: 10.1039/c7ra04139j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Scalable synthesis of accordion-like graphene via low temperature (below 170 °C) thermal expansion exfoliation of alkylated graphite oxide without any auxiliary equipment.
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Affiliation(s)
- Wensheng Gao
- MOE Key Laboratory for Magnetism and Magnetic Materials
- Institute of Material Science and Engineering
- Lanzhou University
- Lanzhou 730000
- PR China
| | - Jiangong Li
- MOE Key Laboratory for Magnetism and Magnetic Materials
- Institute of Material Science and Engineering
- Lanzhou University
- Lanzhou 730000
- PR China
| | - Xiaojie Yan
- MOE Key Laboratory for Magnetism and Magnetic Materials
- Institute of Material Science and Engineering
- Lanzhou University
- Lanzhou 730000
- PR China
| | - Bochao Zhu
- Lanzhou Petrochemical Research Center
- Petro China
- Lanzhou 730000
- PR China
| | - Junji Jia
- Lanzhou Petrochemical Research Center
- Petro China
- Lanzhou 730000
- PR China
| | - Anping Huang
- Lanzhou Petrochemical Research Center
- Petro China
- Lanzhou 730000
- PR China
| | - Kefeng Xie
- Lanzhou Petrochemical Research Center
- Petro China
- Lanzhou 730000
- PR China
| | - Yongxiao Bai
- MOE Key Laboratory for Magnetism and Magnetic Materials
- Institute of Material Science and Engineering
- Lanzhou University
- Lanzhou 730000
- PR China
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21
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Zhang H, Li C, Chen D, Zhao J, Jiao X, Xia Y. Facile preparation of Prussian blue analogue Co3[Co(CN)6]2with fine-tuning color transition temperature as thermochromic material. CrystEngComm 2017. [DOI: 10.1039/c7ce00384f] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yoonessi M, Shi Y, Scheiman DA, Lebron-Colon M, Tigelaar DM, Weiss RA, Meador MA. Graphene polyimide nanocomposites; thermal, mechanical, and high-temperature shape memory effects. ACS NANO 2012; 6:7644-7655. [PMID: 22931435 DOI: 10.1021/nn302871y] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Flexible graphene polyimide nanocomposites (0.1-4 wt %) with superior mechanical properties over those of neat polyimide resin have been prepared by solution blending. Imide moieties were grafted to amine-functionalized graphene using a step-by-step condensation and thermal imidization method. The imide-functionalized graphene exhibited excellent compatibility with N-methyl-2-pyrrolidone. The dynamic storage moduli of the graphene polyimide nanocomposites increased linearly with increasing graphene content for both unmodified graphene and imidized graphene. Moduli of the imidized graphene nanocomposites were 25-30% higher than those of unmodified graphene nanocomposites. Both neat polyimide and polyimide nanocomposites exhibited shape memory effects with a triggering temperature of 230 °C. where addition of graphene improved the recovery rate. Addition of graphene improved thermal stability of the polyimide nanocomposites for both graphene and modified graphene.
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Affiliation(s)
- Mitra Yoonessi
- Ohio Aerospace Institute, Cleveland, Ohio 44142, United States.
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Kotsokechagia T, Zaki NM, Syres K, de Leonardis P, Thomas A, Cellesi F, Tirelli N. PEGylation of nanosubstrates (titania) with multifunctional reagents: at the crossroads between nanoparticles and nanocomposites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11490-11501. [PMID: 22746328 DOI: 10.1021/la3012958] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Titania (anatase) nanoparticles were successfully PEGylated through the use of catechol (dopamine)-terminated PEG derivatives. The resulting materials were characterized by excellent stability at neutral pH and extremely low toxicity (phagocytic and nonphagocytic cell lines). In particular, we focused on the comparison between mono- and bis-catechol PEGs. Due to the double terminal anchorage on the titania surface, bis-catechol ligands can produce chains differing from classical monoanchored PEG in conformation (horseshoe-shaped vs brush) and thus the possibility of interactions with biomolecules. At the same time, less than quantitative catechol binding may lead to the presence of dangling chains with unbound catechols which can polymerize and eventually produce PEG/titania nanocomposite colloids. Our results on double-functional PEG2000 show the latter to be the case. Pluronic F127 was also used as a bifunctional ligand, leading to nanocomposite aggregates with an even larger organic content.
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Affiliation(s)
- Tania Kotsokechagia
- School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester, United Kingdom
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Shakov AA, Mikhailova SS, Konygin GN. Study of the surface composition of mechanically activated of calcium gluconate by X-ray photoelectron spectroscopy using selective chemical reactions. JOURNAL OF ANALYTICAL CHEMISTRY 2011. [DOI: 10.1134/s1061934811080120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lourenço JMC, Ribeiro PA, Botelho do Rego AM, Raposo M. Counterions in layer-by-layer films--influence of the drying process. J Colloid Interface Sci 2007; 313:26-33. [PMID: 17509599 DOI: 10.1016/j.jcis.2007.04.040] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2007] [Revised: 03/26/2007] [Accepted: 04/18/2007] [Indexed: 10/23/2022]
Abstract
The amount of counterions, measured by means of X-ray photoelectron spectroscopy (XPS), in layer-by-layer (LbL) films of poly(allylamine hydrochloride) (PAH) and poly(styrene sulfonate) (PSS), prepared from solutions with various NaCl concentrations, is shown to be greatly influenced by the film drying process: a smaller amount of counterions is observed in films dried after adsorption of each layer, when compared with films that were never dried during the film preparation. This is attributed to the formation of NaCl nanocrystals during the drying process which dissolve when the film is again immersed in the next polyelectrolyte solution. The presence of bonded water molecules was confirmed in wet films indicating that the counterions near the ionic groups are immersed in a water network. The number of counterions is dependent on the amount of salt in polyelectrolyte solutions in such a way that for a concentration of 0.2 M the relative amount of counterions attains saturation for both dried and wet samples, indicating that the process which leads the aggregation of counterions near of the ionic groups is not influenced by the drying process. Moreover, it is proven for wet samples that the increase in salt concentration leads to a decrease in the number of PAH ionized groups as predicted by the Muthukumar theory [J. Chem. Phys. 120 (2004) 9343] accounting for the counterion condensation on flexible polyelectrolytes.
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Affiliation(s)
- João M C Lourenço
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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Peng G, Hao W, Yang D, He S. Degradation of polyimide film under vacuum ultraviolet irradiation. J Appl Polym Sci 2004. [DOI: 10.1002/app.20920] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Young JT, Boerio FJ. Non-destructive characterization of polymide/copper and polyimide/gold interphases using surface-enhanced Raman scattering and reflection-absorption infrared spectroscopy. SURF INTERFACE ANAL 1993. [DOI: 10.1002/sia.740200504] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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