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Meng D, Xie H, Yan B, Zhao W, Fu Y, Hu W, Gao Y. Probing the Interaction Mechanism of Sodium Oleate and Dodecyl Amine with Quartz Surfaces in the Presence of Ca 2+ Ions by AFM Force Measurement. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38438319 DOI: 10.1021/acsami.3c17292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Quartz is a key raw material in high-tech fields (such as photovoltaics and semiconductor microelectronics), and the most efficient extraction method of quartz is mineral flotation. Quartz activation plays a crucial role in mineral flotation. However, the mechanism underlying the process remains unclear, and the role of additional metal ions is controversial. In this study, the interaction forces between the quartz surface, the dodecylamine (DDA) cation/sodium oleate (NaOL) anion mixed collectors, and Ca2+ were analyzed using atomic force microscopy in order to systematically explore the activation process of quartz flotation. The results confirmed that the activation process was initialized from NaOL, which was adsorbed on the surface of a calcium-covered quartz surface. The existence of DDA inhibited the binding of Ca2+ to NaOL so that more Ca2+ was adsorbed on the quartz surface to provide the adsorption site for NaOL. Moreover, the best adsorption condition of Ca2+ + NaOL + DDA mixed solution was analyzed by quartz crystal microbalance with dissipation, and it demonstrated that the most stable chemisorption environment on the quartz surface was at pH 11.0. In these circumstances, Ca2+ could first adsorb in a point-like manner on the quartz surface, which was then adsorbed with a mixture of NaOL and DDA. This result showed that, at a specific pH, Ca2+ could encourage the coadsorption of cationic/anionic mixed collectors on quartz. This work provides an important new understanding of the intermolecular interactions that take place during complex mineral flotation processes between chemical additives and mineral surfaces. The methodology used in this study can be easily adapted to different interfacial processes, including water treatment, membrane technology, bioengineering, and oil production.
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Affiliation(s)
- Di Meng
- School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
| | - Haipeng Xie
- Physical Science and Electronics, Central South University, Changsha 410083, PR China
| | - Bin Yan
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Weixuan Zhao
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China
| | - Yiming Fu
- Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, 999077 Hong Kong, China
| | - Wenjihao Hu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China
| | - Yongli Gao
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, United States
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Furikado I, Forsman J, Nylander T. Particle Adsorption Using a Quartz Crystal Microbalance with Dissipation by Applying a Kelvin-Voigt-Based Viscoelastic Model and the Gauss-Newton Method. Anal Chem 2023; 95:15286-15292. [PMID: 37782503 DOI: 10.1021/acs.analchem.3c02642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
The use of a quartz crystal microbalance with dissipation (QCM-D) to study the adsorption of particles larger than 100 nm, such as liposomes, viruses, and nano/micro-plastics, remains challenging owing to the lack of appropriate models for data evaluation. This study presents a method for quantifying the adsorption of negatively charged polystyrene latex (100 nm-1 μm) at the solid-liquid interface. The validity of a viscoelastic model based on Kelvin-Voigt theory was assessed, and the model was used to evaluate particle adsorption data obtained from QCM-D measurements. The Gauss-Newton method was used to fit the data; the values obtained were larger than results from atomic force microscopy, indicating that the viscoelastic model combined with the Gauss-Newton method can quantify the adsorption of large polystyrene particles and the surrounding water around them. We suggested that QCM-D, in combination with an appropriate viscoelastic model, is applicable to estimate adsorption at the solid-liquid interface even for soft particles larger than 1 μm, which are out of the range of applications to the hydrodynamics model. Furthermore, we successfully showed that the recorded dissipation reflects the viscoelastic properties of the layer. The viscoelastic model allowed quantification of the rheological properties of the layer. The ratio of the viscous and elastic contributions was characterized by using loss tangent (tan δ) values that were extracted from the experimental data by applying the viscoelastic model. These values were lower for the adsorption of the negatively charged polystyrene particles on a positive surface than on a negative surface. This suggests that tan δ reflects the strength of the contact between the particle and substrate.
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Affiliation(s)
- Ippei Furikado
- Analytical Science Research Laboratories, Kao Corporation,, Wakayama 640-8580, Japan
| | - Jan Forsman
- Computational Chemistry, Lund University, Lund SE-221 00, Sweden
| | - Tommy Nylander
- Physical Chemistry, Department of Chemistry, Lund University, Lund SE-221 00, Sweden
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György C, Kirkman PM, Neal TJ, Chan DHH, Williams M, Smith T, Growney DJ, Armes SP. Enhanced Adsorption of Epoxy-Functional Nanoparticles onto Stainless Steel Significantly Reduces Friction in Tribological Studies. Angew Chem Int Ed Engl 2023; 62:e202218397. [PMID: 36651475 PMCID: PMC10962596 DOI: 10.1002/anie.202218397] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/19/2023]
Abstract
Epoxy-functional sterically-stabilized diblock copolymer nanoparticles (ca. 27 nm) are prepared via RAFT dispersion polymerization in mineral oil. Nanoparticle adsorption onto stainless steel is examined using a quartz crystal microbalance. Incorporating epoxy groups within the steric stabilizer chains results in a two-fold increase in the adsorbed amount, Γ, at 20 °C (7.6 mg m-2 ) compared to epoxy-core functional nanoparticles (3.7 mg m-2 ) or non-functional nanoparticles (3.8 mg m-2 ). A larger difference in Γ is observed at 40 °C; this suggests chemical adsorption of the nanoparticles rather than merely physical adsorption. A remarkable near five-fold increase in Γ is observed for ca. 50 nm epoxy-functional nanoparticles compared to non-functional nanoparticles (31.3 vs. 6.4 mg m-2 , respectively). Tribological studies confirm that chemical adsorption of the latter epoxy-functional nanoparticles leads to a significant reduction in friction between 60 °C and 120 °C.
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Affiliation(s)
- Csilla György
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
| | | | - Thomas J. Neal
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
| | - Derek H. H. Chan
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
| | | | | | | | - Steven P. Armes
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
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Provisional Matrix Formation at Implant Surfaces—The Bridging Role of Calcium Ions. Cells 2022; 11:cells11193048. [PMID: 36231011 PMCID: PMC9563433 DOI: 10.3390/cells11193048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/19/2022] [Accepted: 09/26/2022] [Indexed: 11/17/2022] Open
Abstract
The success of dental implants lies in their strong and lasting integration into the patient’s receiving bone. The first biological interactions at the implant surface determine the subsequent evolution of the integration process. In this study we set our objective to analyze the mechanistic interaction of the early regenerative matrix at implant surfaces modified with calcium ions (Ca) as compared to standard implant surfaces (NoCa). We put the surfaces in a Quartz Crystal Microbalance with Dissipation (QCM-D) to monitor the frequency shift (f) and the viscoelastic properties of the adsorbed biofilms and used Scanning Electron Microscopy (SEM) to visualize the resulting interfaces. Upon the addition of human blood plasma, Ca surfaces formed an adsorbed three-dimensional film attached to the surface (∆f = −40 Hz), while with NoCa, the biofilm formed but was not attached to the surface (∆f = 0 Hz). After 20 min in blood, two representative commercial implants with Ca and NoCa surfaces showed also distinct interfaces: Ca implants formed a visible clot attached to the implant which was composed mainly of platelets (Surface Coverage: 40 ± 20%) and some red blood cells (SC: 9 ± 3%) entrapped within a fibrin network (SC: 93 ± 5%). The NoCa implants were largely populated by red blood cells (SC: 67 ± 12%) with scarce fibrin remnants (SC: 3 ± 2%), and the implants showed no clot on their surfaces macroscopically. The pre-clinical and clinical results discussed in this work encourage the modification of titanium implant surfaces with calcium ions to improve the bone regenerative process. Taken together, these results add more information about the roles of Ca ions in bridging the formation of the provisional matrix at implant surfaces and their effects on implant osseointegration.
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Naranda J, Bračič M, Vogrin M, Maver U, Trojner T. Practical Use of Quartz Crystal Microbalance Monitoring in Cartilage Tissue Engineering. J Funct Biomater 2022; 13:jfb13040159. [PMID: 36278628 PMCID: PMC9590066 DOI: 10.3390/jfb13040159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/14/2022] [Accepted: 09/17/2022] [Indexed: 11/29/2022] Open
Abstract
Quartz crystal microbalance (QCM) is a real-time, nanogram-accurate technique for analyzing various processes on biomaterial surfaces. QCM has proven to be an excellent tool in tissue engineering as it can monitor key parameters in developing cellular scaffolds. This review focuses on the use of QCM in the tissue engineering of cartilage. It begins with a brief discussion of biomaterials and the current state of the art in scaffold development for cartilage tissue engineering, followed by a summary of the potential uses of QCM in cartilage tissue engineering. This includes monitoring interactions with extracellular matrix components, adsorption of proteins onto biomaterials, and biomaterial–cell interactions. In the last part of the review, the material selection problem in tissue engineering is highlighted, emphasizing the importance of surface nanotopography, the role of nanofilms, and utilization of QCM as a “screening” tool to improve the material selection process. A step-by-step process for scaffold design is proposed, as well as the fabrication of thin nanofilms in a layer-by-layer manner using QCM. Finally, future trends of QCM application as a “screening” method for 3D printing of cellular scaffolds are envisioned.
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Affiliation(s)
- Jakob Naranda
- Department of Orthopaedics, University Medical Centre Maribor, SI-2000 Maribor, Slovenia
- Department of Orthopaedics, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia
- Correspondence: (J.N.); (M.B.); Tel.: +386-2-321-1541 (J.N.); +386-2-220-7929 (M.B.)
| | - Matej Bračič
- Laboratory for Characterisation and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, SI-2000 Maribor, Slovenia
- Correspondence: (J.N.); (M.B.); Tel.: +386-2-321-1541 (J.N.); +386-2-220-7929 (M.B.)
| | - Matjaž Vogrin
- Department of Orthopaedics, University Medical Centre Maribor, SI-2000 Maribor, Slovenia
- Department of Orthopaedics, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia
| | - Uroš Maver
- Institute of Biomedical Sciences, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia
- Department of Pharmacology, Faculty of Medicine, University of Maribor, SI-2000 Maribor, Slovenia
| | - Teodor Trojner
- Department of Orthopaedics, University Medical Centre Maribor, SI-2000 Maribor, Slovenia
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Li Z, Li H, Zhao L, Liu X, Wan C. Understanding the role of cations and hydrogen bonds on the stability of aerobic granules from the perspective of the aggregation and adhesion behavior of extracellular polymeric substances. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 795:148659. [PMID: 34237538 DOI: 10.1016/j.scitotenv.2021.148659] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/19/2021] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Extracellular polymeric substances (EPS) were essential for the granulation and stability of aerobic granular sludge (AGS). In this study, the effects of electrostatic interactions, bridging effect of divalent cations, and hydrogen bonds on the EPS-EPS and EPS-surface interaction were verified by enhancing or reducing the specific interaction with the addition of cations or urea. The size and the surface properties of EPS aggregates were investigated, the adhesion behavior and viscoelasticity of EPS were analyzed by quartz crystal microbalance with dissipation monitoring. The changes of EPS in response to the various condition were analyzed by infrared spectroscopy and fluorescence spectrum. The electrostatic repulsion between EPS could be significantly reduced by Ca2+ addition. With the bridging effect, 10 μM of Ca2+ could reduce the negative charge of EPS more effectively than 200 μM of Na+. As Ca2+ could form the complex with the protein and Ca2+ was more inclined to bind with COO-, the Ca2+ took advantage of boosting the EPS-EPS and EPS-surface interaction than Mg2+ at the same ionic strength, which resulted in the denser structure of calcium-treated EPS. The destruction of hydrogen bonds by urea addition reduced the EPS-EPS and EPS-surface interaction, which confirmed the potential existence of hydrogen bonds in the interaction of EPS-EPS and EPS-surface. The removal of hydrogen bonds of EPS destroyed the protein's secondary structure and caused the unfolded state of the protein, which led to the looser structure of the EPS layer.
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Affiliation(s)
- Zhengwen Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Huiqi Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Lianfa Zhao
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Xiang Liu
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Chunli Wan
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China.
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Zhang Z, Wang S, Liu G, Hu D, Yang B, Dai Q, Dou Q. Antifouling hydrogel film based on a sandwich array for salivary glucose monitoring. RSC Adv 2021; 11:27561-27569. [PMID: 35480666 PMCID: PMC9037900 DOI: 10.1039/d1ra03517g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 07/30/2021] [Indexed: 01/28/2023] Open
Abstract
A glucose biosensor prepared using interpenetrating polymer network (IPN) hydrogel as a sensing material is the subject of growing interest due to its fast response and high sensitivity. However, the IPN hydrogel circumvents the traditional antifouling strategy, which often requires thick antifouling coating that can result in poor glucose sensitivity owing to its energetic physical barrier (greater than 43 nm); thus a complex, time-consuming and high-cost salivary preprocessing is needed to remove protein contaminants before salivary glucose detection using the IPN hydrogel. This limits its practical application in trace salivary glucose-level monitoring. Herein, a new hydrogel film based on a sandwich array (HFSA) with a weak physical barrier, which exhibits superior antifouling and sensitivity in salivary glucose detection is reported. HFSA relies on the formation of the sandwich structure containing substrate-grafted, surface-grafted zwitterionic polymer brushes (pSBMA) and phenylboronic acid (PBA)-functionalized hydrogel. The synergistic effect originating from pSBMA brushes on the surface of HFSA and inside the HFSA matrix provides a suitable physical barrier (∼28 nm) and a robust hydration layer for HFSA, which can enhance its sensitivity and antifouling. The results show that HFSA reduce the adsorption of nonspecific protein in 10% saliva by nearly 90% and enhanced the glucose sensitivity by 130%, compared to the IPN hydrogel film. These results demonstrate that HFSA exhibits significant potential as an antifouling and sensitive glucose probe for QCM sensors in non-invasive salivary glucose monitoring.
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Affiliation(s)
- Zifeng Zhang
- School of Materials Science and Engineering, Zhengzhou University Zhengzhou 450001 China
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
| | - Shiwen Wang
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
| | - Guanjiang Liu
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
| | - Debo Hu
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China
| | - Bei Yang
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China
| | - Qing Dai
- School of Materials Science and Engineering, Zhengzhou University Zhengzhou 450001 China
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China
| | - Qian Dou
- Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology Beijing 100190 China
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Saftics A, Kurunczi S, Peter B, Szekacs I, Ramsden JJ, Horvath R. Data evaluation for surface-sensitive label-free methods to obtain real-time kinetic and structural information of thin films: A practical review with related software packages. Adv Colloid Interface Sci 2021; 294:102431. [PMID: 34330074 DOI: 10.1016/j.cis.2021.102431] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 04/16/2021] [Accepted: 04/18/2021] [Indexed: 02/07/2023]
Abstract
Interfacial layers are important in a wide range of applications in biomedicine, biosensing, analytical chemistry and the maritime industries. Given the growing number of applications, analysis of such layers and understanding their behavior is becoming crucial. Label-free surface sensitive methods are excellent for monitoring the formation kinetics, structure and its evolution of thin layers, even at the nanoscale. In this paper, we review existing and commercially available label-free techniques and demonstrate how the experimentally obtained data can be utilized to extract kinetic and structural information during and after formation, and any subsequent adsorption/desorption processes. We outline techniques, some traditional and some novel, based on the principles of optical and mechanical transduction. Our special focus is the current possibilities of combining label-free methods, which is a powerful approach to extend the range of detected and deduced parameters. We summarize the most important theoretical considerations for obtaining reliable information from measurements taking place in liquid environments and, hence, with layers in a hydrated state. A thorough treamtmaent of the various kinetic and structural quantities obtained from evaluation of the raw label-free data are provided. Such quantities include layer thickness, refractive index, optical anisotropy (and molecular orientation derived therefrom), degree of hydration, viscoelasticity, as well as association and dissociation rate constants and occupied area of subsequently adsorbed species. To demonstrate the effect of variations in model conditions on the observed data, simulations of kinetic curves at various model settings are also included. Based on our own extensive experience with optical waveguide lightmode spectroscopy (OWLS) and the quartz crystal microbalance (QCM), we have developed dedicated software packages for data analysis, which are made available to the scientific community alongside this paper.
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Easley AD, Ma T, Eneh CI, Yun J, Thakur RM, Lutkenhaus JL. A practical guide to quartz crystal microbalance with dissipation monitoring of thin polymer films. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210324] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Alexandra D. Easley
- Department of Materials Science and Engineering Texas A&M University College Station Texas USA
| | - Ting Ma
- Artie McFerrin Department of Chemical Engineering Texas A&M University College Station Texas USA
| | - Chikaodinaka I. Eneh
- Artie McFerrin Department of Chemical Engineering Texas A&M University College Station Texas USA
| | - Junyeong Yun
- Artie McFerrin Department of Chemical Engineering Texas A&M University College Station Texas USA
| | - Ratul M. Thakur
- Artie McFerrin Department of Chemical Engineering Texas A&M University College Station Texas USA
| | - Jodie L. Lutkenhaus
- Department of Materials Science and Engineering Texas A&M University College Station Texas USA
- Artie McFerrin Department of Chemical Engineering Texas A&M University College Station Texas USA
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Zhang Z, Dou Q, Wang S, Hu D, Yang B, Zhao Z, Liu H, Dai Q. The development of an antifouling interpenetrating polymer network hydrogel film for salivary glucose monitoring. NANOSCALE 2020; 12:22787-22797. [PMID: 33174578 DOI: 10.1039/d0nr05854h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Owing to its rapid response and broad detection range, a phenylboronic acid (PBA)-functionalized hydrogel film-coated quartz crystal microbalance (QCM) sensor is used to non-invasively monitor salivary glucose in diabetic patients. However, nonspecific protein adsorption on the PBA-functionalized hydrogel film can cause dramatic loss of sensitivity and accuracy of the sensor. A traditional zwitterionic polymer surface with ultra-low protein fouling can hinder the interaction of PBA in the hydrogel matrix with glucose molecules owing to its steric hindrance, resulting in poor glucose sensitivity of the sensor. Herein, we developed a novel hydrogel film that enhanced the antifouling properties and sensitivity of the QCM sensor by infiltrating a glucose-sensitive monomer (i.e., PBA) into a zwitterionic polymer brush matrix to form an interpenetrating polymer network (IPN). The IPN hydrogel film could minimize the glucose sensitivity loss since the antifouling polymer distributed in its matrix. Moreover, a stable hydration layer was formed in this film that could prevent water from transporting out of the matrix, thus further improving its antifouling properties and glucose sensitivity. The experimental results confirmed that the IPN hydrogel film possessed excellent resistance to protein fouling by mucin from whole saliva with reductions in adsorption of nearly 88% and could also enhance the glucose sensitivity by nearly 2 fold, compared to the PBA-functionalized hydrogel film. Therefore, the IPN hydrogel film provides improved antifouling properties and sensitivity of the QCM sensor, which paves the way for non-invasive monitoring of low concentrations of glucose in saliva.
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Affiliation(s)
- Zifeng Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China
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11
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Taneja P, Manjuladevi V, Gupta RK, Kumar S, Gupta KK. Facile ultrathin film of silver nanoparticles for bacteria sensing. Colloids Surf B Biointerfaces 2020; 196:111335. [PMID: 32927339 DOI: 10.1016/j.colsurfb.2020.111335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 08/13/2020] [Accepted: 08/17/2020] [Indexed: 12/29/2022]
Abstract
Silver nanoparticles (AgNPs) exhibit excellent anti-microbial and bactericidal properties. Due to bacterial abhorrence for AgNPs, it is difficult to develop a label-free, sensitive and low-cost bacteria sensor using them. In the present article, we report that an ultrathin and uniform Langmuir-Schaefer (LS) film of AgNPs can be employed for bacteria sensing effectively as compared to that of non-uniform and randomly distributed AgNPs in spin coated film. The uniformly distributed AgNPs in the LS film offer a relatively larger contact surface for bacteria as compared to that of spin coated film. Due to higher contact surface, adsorption of the bacteria on LS film is strongly preferable as compared to that of spin coated film leading to an enhanced sensing performance of the LS film than that of spin coated film. Soil bacteria was grown by the standard protocol and were utilized as model system for bacteria sensing application. The soil bacteria sensing was done by monitoring the piezoresponse and dissipation parameters using a quartz crystal microbalance, simultaneously. Our study indicates that the LS film of AgNPs not only facilitates the adsorption of the soil bacteria but also kills them.
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Affiliation(s)
- Parul Taneja
- Department of Physics, Birla Institute of Technology and Science, Pilani (BITS Pilani), Rajasthan 333031, India
| | - V Manjuladevi
- Department of Physics, Birla Institute of Technology and Science, Pilani (BITS Pilani), Rajasthan 333031, India
| | - R K Gupta
- Department of Physics, Birla Institute of Technology and Science, Pilani (BITS Pilani), Rajasthan 333031, India.
| | - Sandeep Kumar
- Raman Research Institute, Sadashivanagar, Bangalore 560080, India; Department of Chemistry, Nitte Meenakshi Institute of Technology, Bangalore 560064, India
| | - K K Gupta
- Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science, Pilani (BITS Pilani), Rajasthan 333031, India
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Wang D, Liu J, Chen J, Liu Q, Zeng H. New insights into the interfacial behavior and swelling of polymer inclusion membrane (PIM) during Zn (II) extraction process. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2020.115620] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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13
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Gladisch J, Stavrinidou E, Ghosh S, Giovannitti A, Moser M, Zozoulenko I, McCulloch I, Berggren M. Reversible Electronic Solid-Gel Switching of a Conjugated Polymer. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1901144. [PMID: 31993279 PMCID: PMC6974956 DOI: 10.1002/advs.201901144] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 08/20/2019] [Indexed: 05/19/2023]
Abstract
Conjugated polymers exhibit electrically driven volume changes when included in electrochemical devices via the exchange of ions and solvent. So far, this volumetric change is limited to 40% and 100% for reversible and irreversible systems, respectively, thus restricting potential applications of this technology. A conjugated polymer that reversibly expands by about 300% upon addressing, relative to its previous contracted state, while the first irreversible actuation can achieve values ranging from 1000-10 000%, depending on the voltage applied is reported. From experimental and theoretical studies, it is found that this large and reversible volumetric switching is due to reorganization of the polymer during swelling as it transforms between a solid-state phase and a gel, while maintaining percolation for conductivity. The polymer is utilized as an electroactive cladding to reduce the void sizes of a porous carbon filter electrode by 85%.
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Affiliation(s)
- Johannes Gladisch
- Laboratory of Organic ElectronicsDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
- Wallenberg Wood Science CenterDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
| | - Eleni Stavrinidou
- Laboratory of Organic ElectronicsDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
- Wallenberg Wood Science CenterDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
| | - Sarbani Ghosh
- Laboratory of Organic ElectronicsDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
| | - Alexander Giovannitti
- Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonLondonSW7 2AZUK
| | - Maximilian Moser
- Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonLondonSW7 2AZUK
| | - Igor Zozoulenko
- Laboratory of Organic ElectronicsDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
| | - Iain McCulloch
- Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonLondonSW7 2AZUK
- Physical Sciences and Engineering DivisionKAUST Solar Center (KSC)King Abdullah University of Science and Technology (KAUST)KSCThuwal23955–6900Saudi Arabia
| | - Magnus Berggren
- Laboratory of Organic ElectronicsDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
- Wallenberg Wood Science CenterDepartment of Science and TechnologyLinköping UniversitySE‐60174NorrköpingSweden
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Parveen N, Jana PK, Schönhoff M. Viscoelastic Properties of Polyelectrolyte Multilayers Swollen with Ionic Liquid Solutions. Polymers (Basel) 2019; 11:E1285. [PMID: 31374899 PMCID: PMC6722675 DOI: 10.3390/polym11081285] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 11/16/2022] Open
Abstract
Polyelectrolyte multilayers (PEM) obtained by layer-by-layer assembly can be doped with ionic liquid (IL) via the swelling of the films with IL solutions. In order to examine the mechanical properties of IL-containing PEM, we implement a Kelvin-Voigt model to obtain thickness, viscosity and elastic modulus from the frequency and dissipation shifts determined by a dissipative quartz crystal microbalance (QCM-D). We analyze the changes in the modeled thickness and viscoelasticity of PEI(PSS/PADMAC)4PSS and PEI(PSS/PAH)4PSS multilayers upon swelling by increasing the concentration of either 1-Ethyl-3-methylimidazolium chloride or 1-Hexyl-3-methylimidazolium chloride, which are water soluble ILs. The results show that the thickness of the multilayers changes monotonically up to a certain IL concentration, whereas the viscosity and elasticity change in a non-monotonic fashion with an increasing IL concentration. The changes in the modeled parameters can be divided into three concentration regimes of IL, a behavior specific to ILs (organic salts), which does not occur with swelling by simple inorganic salts such as NaCl. The existence of the regimes is attributed to a competition of the hydrophobic interactions of large hydrophobic ions, which enhance the layer stability at a low salt content, with the electrostatic screening, which dominates at a higher salt content and causes a film softening.
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Affiliation(s)
- Nagma Parveen
- Institute of Physical Chemistry, University of Muenster, 48149 Münster, Germany.
- NRW Graduate School of Chemistry, University of Muenster, 48149 Münster, Germany.
| | - Pritam Kumar Jana
- Interdisciplinary Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Monika Schönhoff
- Institute of Physical Chemistry, University of Muenster, 48149 Münster, Germany.
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15
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Gicquel E, Martin C, Gauthier Q, Engström J, Abbattista C, Carlmark A, Cranston ED, Jean B, Bras J. Tailoring Rheological Properties of Thermoresponsive Hydrogels through Block Copolymer Adsorption to Cellulose Nanocrystals. Biomacromolecules 2019; 20:2545-2556. [DOI: 10.1021/acs.biomac.9b00327] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erwan Gicquel
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Céline Martin
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Quentin Gauthier
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Joakim Engström
- Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden
| | - Clara Abbattista
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Anna Carlmark
- Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden
| | - Emily D. Cranston
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada
- Department of Wood Science, University of British Columbia, 2424 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Bruno Jean
- Univ. Grenoble Alpes, CNRS, CERMAV, 38000 Grenoble, France
| | - Julien Bras
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
- Institut Universitaire de France, F-75000 Paris, France
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16
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Hall AR, Geoghegan M. Polymers and biopolymers at interfaces. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:036601. [PMID: 29368695 DOI: 10.1088/1361-6633/aa9e9c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This review updates recent progress in the understanding of the behaviour of polymers at surfaces and interfaces, highlighting examples in the areas of wetting, dewetting, crystallization, and 'smart' materials. Recent developments in analysis tools have yielded a large increase in the study of biological systems, and some of these will also be discussed, focussing on areas where surfaces are important. These areas include molecular binding events and protein adsorption as well as the mapping of the surfaces of cells. Important techniques commonly used for the analysis of surfaces and interfaces are discussed separately to aid the understanding of their application.
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Affiliation(s)
- A R Hall
- Department of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, United Kingdom. Fraunhofer Project Centre for Embedded Bioanalytical Systems, Dublin City University, Glasnevin, Dublin 9, Ireland
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17
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Effects of hydraulic retention time on adsorption behaviours of EPS in an A/O-MBR: biofouling study with QCM-D. Sci Rep 2017; 7:2895. [PMID: 28588277 PMCID: PMC5460173 DOI: 10.1038/s41598-017-03190-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 04/27/2017] [Indexed: 11/18/2022] Open
Abstract
Extra-cellular polymeric substances (EPS) are a major cause of membrane fouling in membrane bioreactors (MBRs). In this study, an anoxic–oxic membrane bioreactor (A/O-MBR) was run continuously for 98 days. The runs were divided into three stages according to hydraulic retention time (HRT) (11.8, 12.5 and 14.3 h, respectively). EPS were extracted from the reactor under the different HRTs. A quartz crystal microbalance with dissipation monitoring (QCM-D) and Fourier transform infrared (FT–IR) were used to study the adherence layer structures and the adsorption behaviours of EPS on the membrane surface. The results indicated that the removal rate of TN was more susceptible to HRT than NH3-N. The observations in the QCM-D suggested that at the lowest HRT (11.8 h), the structure of the adsorption layer is loose and soft and the fluidity was better than for HRTs of 12.5 or 14.3 h. It is likely one of the major reasons for the rapidly blocking of the membrane pores. Furthermore, the higher EPS adherence as analyzed in the QCM-D and EPS concentration could induce a higher osmotic pressure effect, leading to a rapid membrane-fouling rate.
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18
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Kumar Pramanik S, Losada-Pérez P, Reekmans G, Carleer R, D’Olieslaeger M, Vanderzande D, Adriaensens P, Ethirajan A. Physicochemical characterizations of functional hybrid liposomal nanocarriers formed using photo-sensitive lipids. Sci Rep 2017; 7:46257. [PMID: 28406235 PMCID: PMC5390264 DOI: 10.1038/srep46257] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 03/13/2017] [Indexed: 12/24/2022] Open
Abstract
With recent advances in the field of diagnostics and theranostics, liposomal technology has secured a fortified position as a potential nanocarrier. Specifically, radiation/photo-sensitive liposomes containing photo-polymerizable cross-linking lipids are intriguing as they can impart the vesicles with highly interesting properties such as response to stimulus and improved shell stability. In this work, 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphoethanolamine (DTPE) is used as a photo-polymerizable lipid to form functional hybrid-liposomes as it can form intermolecular cross-linking through the diacetylenic groups. Hybrid-liposomes were formulated using mixtures of DTPE and saturated lipids of different chain lengths (dipalmitoylphosphatidylcholine (DPPC) and dimirystoilphosphatidylcholine (DMPC)) at different molar ratios. The physico-chemical characteristics of the liposomes has been studied before and after UV irradiation using a combination of techniques: DSC, QCM-D and solid-state NMR. The results signify the importance of a subtle modification in alkyl chain length on the phase behavior of the hybrid-liposomes and on the degree of crosslinking in the shell.
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Affiliation(s)
- Sumit Kumar Pramanik
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Patricia Losada-Pérez
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Gunter Reekmans
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Robert Carleer
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Marc D’Olieslaeger
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Dirk Vanderzande
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Peter Adriaensens
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Anitha Ethirajan
- Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1 and Agoralaan D, 3590 Diepenbeek, Belgium
- IMEC, associated lab IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
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19
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Chen Q, Xu S, Liu Q, Masliyah J, Xu Z. QCM-D study of nanoparticle interactions. Adv Colloid Interface Sci 2016; 233:94-114. [PMID: 26546115 DOI: 10.1016/j.cis.2015.10.004] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 10/04/2015] [Accepted: 10/05/2015] [Indexed: 12/25/2022]
Abstract
Quartz crystal microbalance with dissipation monitoring (QCM-D) has been proven to be a powerful research tool to investigate in situ interactions between nanoparticles and different functionalized surfaces in liquids. QCM-D can also be used to quantitatively determine adsorption kinetics of polymers, DNA and proteins from solutions on various substrate surfaces while providing insights into conformations of adsorbed molecules. This review aims to provide a comprehensive overview on various important applications of QCM-D, focusing on deposition of nanoparticles and attachment-detachment of nanoparticles on model membranes in complex fluid systems. We will first describe the working principle of QCM-D and DLVO theory pertinent to understanding nanoparticle deposition phenomena. The interactions between different nanoparticles and functionalized surfaces for different application areas are then critically reviewed. Finally, the potential applications of QCM-D in other important fields are proposed and knowledge gaps are identified.
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20
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Kou J, Xu S. In situ kinetics and conformation studies of dodecylamine adsorption onto zinc sulfide using a quartz crystal microbalance with dissipation (QCM-D). Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.11.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Fukada K, Shiratori S. Viscosity sensing by adjusting the interface of a small liquid droplet/silica composite layer on quartz crystal microbalance. RSC Adv 2016. [DOI: 10.1039/c6ra02597h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the different attenuated shear vibrations of hydrophilic quartz crystal microbalance by attached small viscous liquids and this enabled us to measure the viscosity of various 5 μL solutions.
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Affiliation(s)
- Kenta Fukada
- School of Integrated Design Engineering
- Center for Science and Technology for Designing Functions
- Graduate School of Science and Technology
- Keio University
- Yokohama
| | - Seimei Shiratori
- School of Integrated Design Engineering
- Center for Science and Technology for Designing Functions
- Graduate School of Science and Technology
- Keio University
- Yokohama
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22
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Rodenhausen KB, Davis RS, Sekora D, Liang D, Mock A, Neupane R, Schmidt D, Hofmann T, Schubert E, Schubert M. The retention of liquid by columnar nanostructured surfaces during quartz crystal microbalance measurements and the effects of adsorption thereon. J Colloid Interface Sci 2015; 455:226-35. [DOI: 10.1016/j.jcis.2015.05.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 05/19/2015] [Accepted: 05/20/2015] [Indexed: 12/31/2022]
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23
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Zhang R, Ma S, Wei Q, Ye Q, Yu B, van der Gucht J, Zhou F. The Weak Interaction of Surfactants with Polymer Brushes and Its Impact on Lubricating Behavior. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01267] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Ran Zhang
- State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
- University
of Chinese Academy of Sciences, 100049 Beijing, China
| | - Shuanhong Ma
- State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
- University
of Chinese Academy of Sciences, 100049 Beijing, China
| | - Qiangbing Wei
- State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
| | - Qian Ye
- State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
| | - Bo Yu
- State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
| | - Jasper van der Gucht
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, NL-6703
HB Wageningen, The Netherlands
| | - Feng Zhou
- State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
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24
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Graphene-polyelectrolyte multilayer film formation driven by hydrogen bonding. J Colloid Interface Sci 2015; 456:32-41. [PMID: 26092114 DOI: 10.1016/j.jcis.2015.05.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 05/19/2015] [Accepted: 05/19/2015] [Indexed: 11/24/2022]
Abstract
A method for preparing hydrogen bonded multilayer thin films comprised of layer pairs of surfactant stabilized graphene and an anionic polyelectrolyte is described. The films were constructed at low pH using the Layer-By-Layer (LbL) technique, where the adsorption of the cationic polyelectrolyte, polyethyleneimine (PEI) is followed by the sequential alternating adsorption of the anionic polyelectrolyte, polyacrylic acid (PAA) and anionic graphene sheets modified with Pluronic® F108, a polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) surfactant. Quartz Crystal Microbalance (QCM) measurements indicate that film formation was driven by hydrogen bonding between the carboxylic acid group of the PAA and ethylene oxide unit present in the surfactant. QCM measurements and Raman spectra showed evidence of non-linear and linear growth at low and high numbers of adsorbed layers respectively, suggesting overall superlinear film growth. Atomic Force Microscopy (AFM) Quantitative Nanomechanical Mapping (QNM) measurements of the films indicated that the reduced Young's Modulus of the films decreased with increasing numbers of adsorbed layers, reaching a bulk value of 6.07-32.3 MPa for samples with greater than 300 layers of surfactant stabilized graphene and PAA. The films were also shown to deteriorate partially with aqueous solutions at neutral and basic pH. The thin films exhibited features advantageous for use in coatings, such as pH responsiveness in addition to different mechanical properties, surface roughness, and internal structures based on the number of layers adsorbed.
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25
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Chandrasekaran N, Dimartino S, Janmale T, Gieseg SP, Fee CJ. Adsorption of chemically synthesized mussel adhesive peptide sequences containing DOPA on stainless steel. J Pept Sci 2015; 21:630-5. [DOI: 10.1002/psc.2776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 01/21/2015] [Accepted: 03/04/2015] [Indexed: 01/09/2023]
Affiliation(s)
- Neha Chandrasekaran
- Department of Chemical and Process Engineering; University of Canterbury; Christchurch New Zealand
| | - Simone Dimartino
- Department of Chemical and Process Engineering; University of Canterbury; Christchurch New Zealand
- Biomolecular Interaction Centre; University of Canterbury; Christchurch New Zealand
| | - Tejraj Janmale
- Free Radical Biochemistry, School of Biological Sciences; University of Canterbury; Christchurch New Zealand
| | - Steven P. Gieseg
- Free Radical Biochemistry, School of Biological Sciences; University of Canterbury; Christchurch New Zealand
- Department of Radiology; University of Otago Christchurch; New Zealand
| | - Conan J. Fee
- Department of Chemical and Process Engineering; University of Canterbury; Christchurch New Zealand
- Biomolecular Interaction Centre; University of Canterbury; Christchurch New Zealand
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26
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Alejo T, Merchán MD, Velázquez MM. Adsorption of quantum dots onto polymer and Gemini surfactant films: a quartz crystal microbalance study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9977-9984. [PMID: 25093530 DOI: 10.1021/la5024955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We used quartz crystal microbalance with dissipation to study the mechanical properties, the kinetics of adsorption, and the amount of CdSe quantum dots (QDs) adsorbed onto a SiO2 sensor, referred as bare sensor, onto the sensor modified with a film of the polymer poly(maleic anhydride-alt-1-octadecene), PMAO, or with a film of the Gemini surfactant ethyl-bis(dimethyl octadecyl ammonium bromide), abbreviated as 18-2-18. Results showed that when the sensor is coated with polymer or surfactant molecules, the coverage increases compared with that obtained for the bare sensor. On the other hand, rheological properties and kinetics of adsorption of QDs are driven by QD nanoparticles. Thus, the QD films present elastic behavior, and the elasticity values are independent of the molecule used as coating and similar to the elasticity value obtained for QDs films on the bare sensor. The QD adsorption is a two-step mechanism in which the fastest process is attributed to the QD adsorption onto the solid substrate and the slowest one is ascribed to rearrangement movements of the nanoparticles adsorbed at the surface.
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Affiliation(s)
- T Alejo
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Salamanca . 37008 Salamanca, Spain
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27
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Liu Y, Zhang B, Javvaji V, Kim E, Lee ME, Raghavan SR, Wang Q, Payne GF. Tyrosinase-mediated grafting and crosslinking of natural phenols confers functional properties to chitosan. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2013.11.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Zhao AS, Wang Z, Zhu XH, Maitz MF, Huang N. Real-Time Characterization of Fibrinogen Interaction with Modified Titanium Dioxide Film by Quartz Crystal Microbalance with Dissipation. CHINESE J CHEM PHYS 2014. [DOI: 10.1063/1674-0068/27/03/355-360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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29
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Sham AYW, Notley SM. Layer-by-layer assembly of thin films containing exfoliated pristine graphene nanosheets and polyethyleneimine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2410-2418. [PMID: 24528297 DOI: 10.1021/la404745b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A method for the modification of surface properties through the deposition of stabilized graphene nanosheets is described. Here, the thickness of the film is controlled through the use of the layer-by-layer technique, where the sequential adsorption of the cationic polyethyleneimine (PEI) is followed by the adsorption of anionic graphene sheets modified with layers of polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) surfactants. The graphene particles were prepared using the surfactant-assisted liquid-phase exfoliation technique, with the low residual negative charge arising from edge defects. The buildup of the multilayer assembly through electrostatic interactions was strongly influenced by the solution conditions, including pH, ionic strength, and ionic species. Thereby, not only could the thickness of the film be tailored through the choice of the number of bilayers deposited but the viscoelastic properties of the film could also be modified by changing solution conditions at which the different species were deposited. The quartz crystal microbalance was used to measure the mass of graphene and polyelectrolyte immobilized at the interface as well as to probe the energy dissipated in the adsorbed layer.
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Affiliation(s)
- Alison Y W Sham
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra, Australian Capital Territory 0200, Australia
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30
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Benedetti TM, Torresi RM. Rheological changes and kinetics of water uptake by poly(ionic liquid)-based thin films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:15589-15595. [PMID: 24289223 DOI: 10.1021/la4038809] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Water uptake by thin films composed of the poly(ionic liquid) poly[diallyldimethylammonium bis(trifluoromethanesulfonyl)imide] (PDDATf2N) and the ionic liquid N,N-butylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr1.4Tf2N) was studied with a quartz crystal microbalance with dissipation. The data obtained for films with different compositions during the passage of dry and wet N2 flow through the films were simulated with the Kevin-Voigt viscoelastic model for assessment of the mass of uptake water as well as the viscoelastic parameters. Our results show that the ionic liquid acts as a plasticizer, reducing the rigidity of the film and decreasing the capacity of water uptake. Introduction to a Li salt (LiTf2N) increases the water uptake capacity and also affects both elastic and viscous parameters due to aggregation among the ions from the ionic liquid and Li(+). However, due to the preferable interaction of Li(+) ions with water molecules, these aggregates are broken when the film is hydrated. In short, the presence of water in such films affects their mechanical properties, which can reflect in their performances as solid state electrolytes and ion-conducting membranes for electrochemical applications.
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Affiliation(s)
- Tânia M Benedetti
- Instituto de Química, Universidade de São Paulo (USP) , CP 26077, 05513-970, São Paulo-SP, Brazil
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Wang C, Kittle JD, Qian C, Roman M, Esker AR. Chitinase Activity on Amorphous Chitin Thin Films: A Quartz Crystal Microbalance with Dissipation Monitoring and Atomic Force Microscopy Study. Biomacromolecules 2013; 14:2622-8. [DOI: 10.1021/bm4004833] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chao Wang
- Department
of Chemistry and ‡Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Joshua D. Kittle
- Department
of Chemistry and ‡Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Chen Qian
- Department
of Chemistry and ‡Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Maren Roman
- Department
of Chemistry and ‡Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Alan R. Esker
- Department
of Chemistry and ‡Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States
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33
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Jang Y, Seo J, Akgun B, Satija S, Char K. Molecular Weight Dependence on the Disintegration of Spin-Assisted Weak Polyelectrolyte Multilayer Films. Macromolecules 2013. [DOI: 10.1021/ma4007736] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yeongseon Jang
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, School of Chemical & Biological Engineering, Seoul National University, Seoul 151-744, Korea
| | - Jooyeon Seo
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, School of Chemical & Biological Engineering, Seoul National University, Seoul 151-744, Korea
| | - Bulent Akgun
- NIST
Center for Neutron Research, NIST, Gaithersburg,
Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Sushil Satija
- NIST
Center for Neutron Research, NIST, Gaithersburg,
Maryland 20899-6102, United States
| | - Kookheon Char
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, School of Chemical & Biological Engineering, Seoul National University, Seoul 151-744, Korea
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Kao WL, Chang HY, Yen GJ, Kuo DY, You YW, Huang CC, Kuo YT, Lin JH, Shyue JJ. Adsorption behavior of plasmid DNA on binary self-assembled monolayers modified gold substrates. J Colloid Interface Sci 2012; 382:97-104. [DOI: 10.1016/j.jcis.2012.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 05/31/2012] [Accepted: 06/01/2012] [Indexed: 11/25/2022]
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Doliška A, Ribitsch V, Stana Kleinschek K, Strnad S. Viscoelastic properties of fibrinogen adsorbed onto poly(ethylene terephthalate) surfaces by QCM-D. Carbohydr Polym 2012; 93:246-55. [PMID: 23465926 DOI: 10.1016/j.carbpol.2012.02.075] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 02/17/2012] [Accepted: 02/21/2012] [Indexed: 11/27/2022]
Abstract
In presented study a new approach using QCM-D for biocompatibility determination was introduced. The adsorption of fibrinogen on PET and modified PET surfaces was monitored in situ using QCM-D. Protein layer thicknesses were estimated on the basis of a Voight based viscoelastic model. The hydrophilicities and morphologies of the surfaces were investigated using a goniometer and AFM. The results showed that PET surfaces coated with sulphated polysaccharides are more hydrophilic and more fibrinogen-repulsive than non-modified PET surfaces. QCM-D equipped with QTools modelling software is well-applicable to the characterisation of surface properties and can be optimised for biocompatibility determination.
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Affiliation(s)
- Aleš Doliška
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia.
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Schlichtiger A, Luppa PB, Neumeier D, Thaler M. Biosensor approaches for the detection of autoantibodies in human serum. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s12566-012-0028-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Mateescu A, Wang Y, Dostalek J, Jonas U. Thin hydrogel films for optical biosensor applications. MEMBRANES 2012; 2:40-69. [PMID: 24957962 PMCID: PMC4021880 DOI: 10.3390/membranes2010040] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2011] [Revised: 01/18/2012] [Accepted: 01/29/2012] [Indexed: 12/21/2022]
Abstract
Hydrogel materials consisting of water-swollen polymer networks exhibit a large number of specific properties highly attractive for a variety of optical biosensor applications. This properties profile embraces the aqueous swelling medium as the basis of biocompatibility, non-fouling behavior, and being not cell toxic, while providing high optical quality and transparency. The present review focuses on some of the most interesting aspects of surface-attached hydrogel films as active binding matrices in optical biosensors based on surface plasmon resonance and optical waveguide mode spectroscopy. In particular, the chemical nature, specific properties, and applications of such hydrogel surface architectures for highly sensitive affinity biosensors based on evanescent wave optics are discussed. The specific class of responsive hydrogel systems, which can change their physical state in response to externally applied stimuli, have found large interest as sophisticated materials that provide a complex behavior to hydrogel-based sensing devices.
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Affiliation(s)
- Anca Mateescu
- Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure & Laser (IESL), Bio-Organic Materials Chemistry Laboratory (BOMCLab), Nikolaou Plastira 100, Vassilika Vouton, Heraklion 71110, Crete, Greece.
| | - Yi Wang
- AIT Austrian Institute of Technology GmbH, Muthgasse 11, Vienna 1190, Austria.
| | - Jakub Dostalek
- AIT Austrian Institute of Technology GmbH, Muthgasse 11, Vienna 1190, Austria.
| | - Ulrich Jonas
- Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure & Laser (IESL), Bio-Organic Materials Chemistry Laboratory (BOMCLab), Nikolaou Plastira 100, Vassilika Vouton, Heraklion 71110, Crete, Greece.
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Yan M, Liu C, Wang D, Ni J, Cheng J. Characterization of adsorption of humic acid onto alumina using quartz crystal microbalance with dissipation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9860-9865. [PMID: 21774560 DOI: 10.1021/la1042102] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, a quartz crystal microbalance with dissipation monitoring (QCM-D) is used to investigate humic acid (HA) adsorption onto alumina (Al(2)O(3)). The amount of adsorption and layer structures of HA were determined by the real-time monitoring of resonance frequency and energy dissipation changes (Δf and ΔD). The effect of HA concentration, HA molecular characteristics (molecular weight and polarity), and pH on HA adsorption onto Al(2)O(3) were investigated. The mass of HA adsorption increases as the concentration of HA increases. The masses are about 24, 60, and 87 ng cm(-2) as the concentration of DOC is 1.0, 4.85, and 92.0 mg L(-1), respectively. The adsorbed layer of HA is more nonrigid, and the mass of HA adsorption is higher at weakly acidic pH values. It was 20, 80, 65, and 45 ng cm(-2) at pH values of 4.5, 5.5, 6.5, and 8.0, respectively. This reveals that efficient HA removal by coagulation at weakly acidic pH values is not just due to the hydrolysis of Al ions as previously presumed. The adsorbed layer of hydrophobic HA is more nonrigid than hydrophobic HA (fractionated by Amberlite XAD-8 resin), and the mass adsorption for the hydrophobic fraction is about four times higher than the hydrophilic fraction (120 ng cm(-2) and 30 ng cm(-2)). The method is of value in the research to establish a quantified calculation model for the coagulation process.
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Affiliation(s)
- Mingquan Yan
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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Kepplinger C, Lisdat F, Wollenberger U. Cytochrome c/polyelectrolyte multilayers investigated by E-QCM-D: effect of temperature on the assembly structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8309-8315. [PMID: 21634413 DOI: 10.1021/la200860p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Protein multilayers, consisting of cytochrome c (cyt c) and poly(aniline sulfonic acid) (PASA), are investigated by electrochemical quartz crystal microbalance with dissipation monitoring (E-QCM-D). This technique reveals that a four-bilayer assembly has rather rigid properties. A thickness of 16.3 ± 0.8 nm is calculated with the Sauerbrey equation and is found to be in good agreement with a viscoelastic model. The electroactive amount of cyt c is estimated by the deposited mass under the assumption of 50% coupled water. Temperature-induced stabilization of the multilayer assembly has been investigated in the temperature range between 30 and 45 °C. The treatment results in a loss of material and a contraction of the film. The electroactive amount of cyt c also decreases during heating and remains constant after the cooling period. The contraction of the film is accompanied by the enhanced stability of the assembly. In addition, it is found that cyt c and PASA can be assembled at higher temperatures, resulting in the formation of multilayer systems with less dissipation.
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Affiliation(s)
- Christian Kepplinger
- Biosystems Technology, Wildau University of Applied Science, Bahnhofstrasse 1, 15745 Wildau, Germany
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Oguchi T, Sakai K, Sakai H, Abe M. DSPC/DLPC Mixed Films Supported on Silica: A QCM-D and Friction Force Study. J Oleo Sci 2011; 60:177-83. [DOI: 10.5650/jos.60.177] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Sedeva IG, Fornasiero D, Ralston J, Beattie DA. Reduction of surface hydrophobicity using a stimulus-responsive polysaccharide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:15865-15874. [PMID: 20853820 DOI: 10.1021/la101695w] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The adsorption of carboxymethyl cellulose (CMC) onto a hydrophobic self-assembled monolayer has been characterized using the quartz crystal microbalance (with dissipation monitoring, QCM-D). Adsorption was studied as a function of initial solution conditions. CMC adsorbs to a greater extent at high ionic strength (10(-1) M KCl as opposed to 10(-2) M KCl) or low pH (3 as opposed to 9). The solution conditions that yielded the lowest initial adsorbed amount (10(-2) M KCl, pH 9) were used as a reference to investigate the response of the adsorbed layer to a switch in solution conditions after adsorption (i.e., to higher ionic strength (10(-1) M KCl) or lower pH (pH 3)). The adsorbed layer released significant amounts of hydration water after each solution switch, as determined by the QCM-D measurements. This expulsion of hydration water was fully reversible. For the two solution switches, reducing the solution pH resulted in a more pronounced change in the amount of hydration water within the adsorbed CMC, accompanied by a distinct conformational change, as determined from a QCM D-f plot. In addition to studying adsorption using QCM-D, the effect of adsorbed CMC on surface hydrophobicity has been investigated using captive bubble contact angle measurements. The effect of the polymer on the contact angle of the surface was seen to be greatest when adsorbed at low pH or at higher ionic strength. CMC was also seen to have a significantly enhanced ability to reduce the surface hydrophobicity after both the ionic strength and pH switches, lowering the advancing water contact angle by 6 and 23° and the receding water contact angle by 10 and 40° for the ionic strength and pH switches, respectively. As with the change in hydration water content, the change in the contact angle of the polymer-coated surface following the solution switches was reversible.
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Affiliation(s)
- Iliana G Sedeva
- Ian Wark Research Institute, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia
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Characterization of Matrigel interfaces during defined human embryonic stem cell culture. Biointerphases 2010; 4:69-79. [PMID: 20408727 DOI: 10.1116/1.3274061] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Differences in attachment, proliferation, and differentiation were measured for human embryonic stem (hES) cells cultured on various substrata coated with Matrigel, a blend of extracellular matrix proteins derived from murine tumor cells. The authors observed that hES cells attach and grow poorly on Matrigel adsorbed onto polystyrene, while they proliferate when exposed to Matrigel adsorbed onto glass or oxygen plasma treated polystyrene (e.g., "tissue culture" treated polystyrene). Furthermore, hES cells grown on the Matrigel-coated tissue culture polystyrene are less likely to differentiate than those grown on the Matrigel-coated glass. To assess the mechanism for these observations, they replicated the cell culture interface in a quartz crystal microbalance with dissipation monitoring. In addition, they used ellipsometry and scanning electron microscopy to determine the thickness and topography of Matrigel on the varying surfaces. Matrigel formed a viscoelastic multilayer with similar thickness on all three surfaces; however, the network structure was different, where the adsorbed proteins formed a globular network on polystyrene, and fibrillar networks on the hydrophilic substrates. Matrigel networks on glass were denser than on oxygen plasma treated polystyrene, suggesting that the density and structure of the Matrigel network affects stem cell differentiation, where a denser network promoted uncontrolled hES cell differentiation and did not maintain the self-renewal phenotype.
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Al-Hashmi A, Luckham P. Characterization of the adsorption of high molecular weight non-ionic and cationic polyacrylamide on glass from aqueous solutions using modified atomic force microscopy. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.01.049] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ohlsson G, Langhammer C, Zorić I, Kasemo B. A nanocell for quartz crystal microbalance and quartz crystal microbalance with dissipation-monitoring sensing. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:083905. [PMID: 19725665 DOI: 10.1063/1.3202207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel device for nanometer-confinement of soft matter in one dimension (1D) is presented. This nanocell, with very large (up to 10(6):1) cell-radius to cell-height ratio, is tailored as an accessory for quartz crystal microbalance (QCM) and QCM with dissipation-monitoring (QCM-D) sensing to study internal and interfacial energy dissipation phenomena in highly confined (in 1D) soft matter and fluid films (patent pending). The cell consists of two macroscopic plates (diameter of 9 mm), a top (the "lid") and a bottom (the QCM-D sensor), separated by appropriate spacers with heights ranging from below 100 nm up to 10 microm. The surfaces of both the lid and the bottom plate can be mechanically or/and chemically modified, prior to cell assembly, in order to tailor desired interfacial properties for the experiment. The cell is mounted on a standard QCM-D sensor, an AT-cut quartz crystal (the quartz crystal is cut at an angle of 35 degrees from its ZX-plane), forming the bottom plate. We illustrate theoretically and experimentally, as application examples, the use of this device for studies of dynamic mass loading and internal energy dissipation processes in thin films of ethylene glycol respective thin liquid crystal films around the nematic-isotropic phase transition.
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Affiliation(s)
- Gabriel Ohlsson
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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Irwin EF, Saha K, Rosenbluth M, Gamble LJ, Castner DG, Healy KE. Modulus-dependent macrophage adhesion and behavior. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2009; 19:1363-82. [PMID: 18854128 DOI: 10.1163/156856208786052407] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Macrophage attachment and activation to implanted materials is crucial in determining the extent of acute and chronic inflammation, and biomaterials degradation. In an effort to improve implant performance, considerable attention has centered on altering material surface chemistry to modulate macrophage behavior. In this work, the influence of the modulus of a material on the behavior of model macrophages (i.e., human promonocytic THP-1 cells) was investigated. We synthesized interpenetrating polymer network (IPN) coatings with varying moduli to test the hypothesis that lower moduli surfaces attenuate THP-1 cell attachment and activation. The surface chemistry and moduli of the IPN coatings were characterized using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM), respectively. THP-1 cells preferentially attached to stiffer coatings of identical surface chemistry, confirming that fewer macrophages attach to lower moduli surfaces. The secretion of human TNF-alpha, IL-10, IL-8 and IL-1beta from THP-1 cells attached to the IPNs was measured to assess the concentration of both pro- and anti-inflammatory cytokines. The global amount of TNF-alpha released did not vary for IPN surfaces of different moduli; however, the amount of the pro-inflammatory cytokine IL-8 released demonstrated a biphasic response, where lower (approx. 1.4 kPa) and very high (approx. 348 kPa) moduli IPN surfaces attenuated IL-8 secretion. The different trends for TNF-alpha and IL-8 secretion highlight the complexity of the wound healing response, suggesting that there may not be a unique surface chemistry and substratum modulus combination that minimizes the pro-inflammatory cytokines produced by activated macrophages.
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Affiliation(s)
- E F Irwin
- Department of Bioengineering, University of California-Berkeley, Berkeley, CA 94720, USA
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Beauregard A, Curcio MJ, Belfort M. The take and give between retrotransposable elements and their hosts. Annu Rev Genet 2009; 42:587-617. [PMID: 18680436 DOI: 10.1146/annurev.genet.42.110807.091549] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Retrotransposons mobilize via RNA intermediates and usually carry with them the agent of their mobility, reverse transcriptase. Retrotransposons are streamlined, and therefore rely on host factors to proliferate. However, retrotransposons are exposed to cellular forces that block their paths. For this review, we have selected for our focus elements from among target-primed (TP) retrotransposons, also called non-LTR retrotransposons, and extrachromosomally-primed (EP) retrotransposons, also called LTR retrotransposons. The TP retrotransposons considered here are group II introns, LINEs and SINEs, whereas the EP elements considered are the Ty and Tf retrotransposons, with a brief comparison to retroviruses. Recurring themes for these elements, in hosts ranging from bacteria to humans, are tie-ins of the retrotransposons to RNA metabolism, DNA replication and repair, and cellular stress. Likewise, there are parallels among host-cell defenses to combat rampant retrotransposon spread. The interactions between the retrotransposon and the host, and their coevolution to balance the tension between retrotransposon proliferation and host survival, form the basis of this review.
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Affiliation(s)
- Arthur Beauregard
- New York State Department of Health, Center for Medical Sciences, Albany, New York 12208, 12201-2002, USA.
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Jung H, Tae G, Kim YH, Johannsmann D. Change of viscoelastic property and morphology of fibrin affected by antithrombin III and heparin: QCM-Z and AFM study. Colloids Surf B Biointerfaces 2009; 68:111-9. [DOI: 10.1016/j.colsurfb.2008.09.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 09/25/2008] [Accepted: 09/25/2008] [Indexed: 10/21/2022]
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Palmqvist L, Holmberg K. Dispersant adsorption and viscoelasticity of alumina suspensions measured by quartz crystal microbalance with dissipation monitoring and in situ dynamic rheology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:9989-9996. [PMID: 18707142 DOI: 10.1021/la800719u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Adsorption behavior and water content of adsorbed layers of four dispersants for aqueous ceramic processing were studied by quartz crystal microbalance with dissipation monitoring (QCM-D) on alumina surfaces. The dispersants were a poly(acrylic acid), a lignosulfonate, and two hydrophilic comb copolymers with nonionic polyoxyethylene chains of different molecular weights. A Voigt model was applied to analyze the viscoelastic behavior of the adsorbed dispersant layers. The results from QCM-D were compared with viscoelastic properties determined by in situ dynamic rheology measurements of highly concentrated alumina suspensions during slip casting. The QCM-D results showed that both the poly(acrylic acid) and the lignosulfonate adsorbed in low amounts and in a flat conformation, which generated thin, highly rigid layers less than 1 nm thick. The water content of these layers was found to be around 30% for the lignosulfonate and 35% for the poly(acrylic acid). High casting rate and strength in terms of storage modulus were observed in the final consolidate of the suspensions with the two polyelectrolytes. In contrast, the high molecular weight comb copolymer adsorbed in a less elastic layer with a thickness of about 6 nm, which is enough to provide steric stabilization. The viscous behavior of this layer was attributed to high water content, which was calculated to be around 90%. Such a water-rich layer gives a lubrication effect, which allows for reorientation of particles during the consolidation process, resulting in a high final strength of the ceramic material. During consolidation, the suspension showed a slow casting rate, most likely due to rearrangement facilitated by the lubricating layer. The short-chain comb copolymer adsorbed in a 1.5 nm thick, rigid layer and gave low final strength to the consolidated suspension. It is likely that the poor consolidation behavior is caused by flocculation due to insufficient stabilization of the dispersion.
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