1
|
Hoang J, Patil SL, Srinoi P, Liu T, Marquez MD, Khantamat O, Tuntiwechapikul W, Gunaratne PH, Lee TR. Transfection of Unmodified MicroRNA Using Monolayer-Coated Au Nanoparticles as Gene-Delivery Vehicles. ACS APPLIED BIO MATERIALS 2024; 7:230-237. [PMID: 38133569 DOI: 10.1021/acsabm.3c00837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
This article describes a monolayer-coated gold nanoparticle-based transfection system for the delivery of microRNA (miRNA) into human osteosarcoma (HOS) cells. Two distinct ammonium-terminated adsorbates were used in this study, which provided a platform for ionic bonding of the miRNA onto gold nanoparticles (AuNPs). The custom-designed monolayer-coated gold nanoparticles were characterized by dynamic light scattering, gel mobility shift assay, transmission electron microscopy, ultraviolet-visible spectrometry, zeta potential, and X-ray photoelectron spectroscopy. The miRNA-loaded gold nanoparticles were transfected, and the level of intracellular miRNA delivered and taken up by cells was measured by Taqman qPCR. The overall analysis indicated a successful delivery of miRNA into the HOS cells at an ∼11,000-fold increase compared to nontreated cells.
Collapse
Affiliation(s)
- Johnson Hoang
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, United States
| | - Sagar L Patil
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, United States
- St. Jude Children's Research Hospital, Memphis, Tennessee 38105, United States
| | - Pannaree Srinoi
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
- Department of Chemistry and Centre of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Tingting Liu
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
| | - Maria D Marquez
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
| | - Orawan Khantamat
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wirote Tuntiwechapikul
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Preethi H Gunaratne
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, United States
| | - T Randall Lee
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
| |
Collapse
|
2
|
Faase RA, Keeling NM, Plaut JS, Leycam C, Munares GA, Hinds MT, Baio JE, Jurney PL. Temporal Changes in the Surface Chemistry and Topography of Reactive Ion Plasma-Treated Poly(vinyl alcohol) Alter Endothelialization Potential. ACS APPLIED MATERIALS & INTERFACES 2024; 16:389-400. [PMID: 38117934 PMCID: PMC10788828 DOI: 10.1021/acsami.3c16759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 11/30/2023] [Accepted: 12/01/2023] [Indexed: 12/22/2023]
Abstract
Synthetic small-diameter vascular grafts (<6 mm) are used in the treatment of cardiovascular diseases, including coronary artery disease, but fail much more readily than similar grafts made from autologous vascular tissue. A promising approach to improve the patency rates of synthetic vascular grafts is to promote the adhesion of endothelial cells to the luminal surface of the graft. In this study, we characterized the surface chemical and topographic changes imparted on poly(vinyl alcohol) (PVA), an emerging hydrogel vascular graft material, after exposure to various reactive ion plasma (RIP) surface treatments, how these changes dissipate after storage in a sealed environment at standard temperature and pressure, and the effect of these changes on the adhesion of endothelial colony-forming cells (ECFCs). We showed that RIP treatments including O2, N2, or Ar at two radiofrequency powers, 50 and 100 W, improved ECFC adhesion compared to untreated PVA and to different degrees for each RIP treatment, but that the topographic and chemical changes responsible for the increased cell affinity dissipate in samples treated and allowed to age for 230 days. We characterized the effect of aging on RIP-treated PVA using an assay to quantify ECFCs on RIP-treated PVA 48 h after seeding, atomic force microscopy to probe surface topography, scanning electron microscopy to visualize surface modifications, and X-ray photoelectron spectroscopy to investigate surface chemistry. Our results show that after treatment at higher RF powers, the surface exhibits increased roughness and greater levels of charged nitrogen species across all precursor gases and that these surface modifications are beneficial for the attachment of ECFCs. This study is important for our understanding of the stability of surface modifications used to promote the adhesion of vascular cells such as ECFCs.
Collapse
Affiliation(s)
- Ryan A. Faase
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, 103 Gleeson Hall, Corvallis, Oregon 97331, United States
| | - Novella M. Keeling
- Biomedical
Engineering Program, University of Colorado
Boulder, 1111 Engineering Drive 521 UCB, Boulder, Colorado 80309-0521, United States
- Department
of Biomedical Engineering, Oregon Health
and Science University, 3303 SW Bond Ave, Portland, Oregon 97239, United States
| | - Justin S. Plaut
- Cancer
Early Detection Advanced Research Center, Knight Cancer Institute, Oregon Health and Science University, 3303 SW Bond Ave, Portland, Oregon 97239, United States
| | - Christian Leycam
- Department
of Biomedical Engineering, San José
State University, One Washington Square, San Jose, California 95112-3613, United States
| | - Gabriela Acevedo Munares
- Department
of Biomedical Engineering, San José
State University, One Washington Square, San Jose, California 95112-3613, United States
| | - Monica T. Hinds
- Department
of Biomedical Engineering, Oregon Health
and Science University, 3303 SW Bond Ave, Portland, Oregon 97239, United States
| | - Joe E. Baio
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, 103 Gleeson Hall, Corvallis, Oregon 97331, United States
| | - Patrick L. Jurney
- Department
of Biomedical Engineering, San José
State University, One Washington Square, San Jose, California 95112-3613, United States
| |
Collapse
|
3
|
Akaike K, Shimoi Y, Miura T, Morita H, Akiyama H, Horiuchi S. Disentangling Origins of Adhesive Bonding at Interfaces between Epoxy/Amine Adhesive and Aluminum. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:10625-10637. [PMID: 37467444 DOI: 10.1021/acs.langmuir.3c01218] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
Joining metals by adhesive bonding is essential in widespread fields such as mobility, dentistry, and electronics. Although adhesive technology has grown since the 1920s, the roles of interfacial phenomena in adhesive bonding are still elusive, which hampers the on-demand selection of surface treatment and adhesive types. In the present study, we clarified how chemical interactions and mechanical interlocking governed adhesive bonding by evaluating adhesion properties at the interfaces between epoxy/amine adhesive and two kinds of Al adherends: a flat aluminum hydroxide (AlxOyHz) and technical Al plate with roughness. Spectroscopic and microscopical data demonstrate that the protonation of the amino groups in an amine hardener converts Al(OH)3 on the AlxOyHz surface to AlO(OH). The interfacial protonation results in an interfacial dipole layer with positive charges on the adhesive side, whose electrostatic interaction increases the interfacial fracture energy. The double cantilever beam tests for the flat AlxOyHz and technical Al substrates clarify that the mechanical interlocking originating from the surface roughness further increases the fracture energy. This study disentangles the roles of the chemical interactions and mechanical interlocking occurring at the epoxy adhesive/Al interface in the adhesion mechanism.
Collapse
Affiliation(s)
- Kouki Akaike
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yukihiro Shimoi
- Research Center for Computational Design of Advanced Functional Materials (CD-FMat), National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Toshiaki Miura
- Research Center for Computational Design of Advanced Functional Materials (CD-FMat), National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Hiroshi Morita
- Research Center for Computational Design of Advanced Functional Materials (CD-FMat), National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Haruhisa Akiyama
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Shin Horiuchi
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| |
Collapse
|
4
|
Kukk E, Püttner R, Simon M. Recoil lineshapes in hard X-ray photoelectron spectra of large molecules - free and anchored-on-surface 10-aminodecane-1-thiol. Phys Chem Chem Phys 2022; 24:10465-10474. [PMID: 35441614 DOI: 10.1039/d1cp05777d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core-level photoelectron spectroscopy of molecules presents unique opportunities but also challenges in the Hard X-ray Spectroscopy (HAXPES) realm. Here we focus on the manifestation of the photoelectron recoil effects in core-level photoemission spectra, using the independent normal-mode oscillators approach that allows to model and investigate the resulting recoil lineshapes for molecules of large sizes with only a slight computational effort. We model the recoil lineshape for N 1s and C 1s photoemission using the 10-aminodecane-1-thiol molecule as an example. It represents also a class of compounds commonly used in creating self-assembled monolayers (SAMs) on surfaces. Attachment of the -SH head group to the surface is modelled here in a simplified way by anchoring the sulfur atom of a single molecule. The effects of the orientation of photoemission in the molecular frame on the recoil lineshape of such anchored molecules are illustrated and discussed as a possible geometry probe. Time-evolution of the recoil excitations from the initial emission site across the entire molecule is also visualized.
Collapse
Affiliation(s)
- Edwin Kukk
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
| | - Ralph Püttner
- Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Marc Simon
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
| |
Collapse
|
5
|
Oliveira DA, Althawab S, McLamore ES, Gomes CL. One-Step Fabrication of Stimuli-Responsive Chitosan-Platinum Brushes for Listeria monocytogenes Detection. BIOSENSORS 2021; 11:bios11120511. [PMID: 34940268 PMCID: PMC8699315 DOI: 10.3390/bios11120511] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/07/2021] [Accepted: 12/09/2021] [Indexed: 06/14/2023]
Abstract
Bacterial contamination in food-processing facilities is a critical issue that leads to outbreaks compromising the integrity of the food supply and public health. We developed a label-free and rapid electrochemical biosensor for Listeria monocytogenes detection using a new one-step simultaneous sonoelectrodeposition of platinum and chitosan (CHI/Pt) to create a biomimetic nanostructure that actuates under pH changes. The XPS analysis shows the effective co-deposition of chitosan and platinum on the electrode surface. This deposition was optimized to enhance the electroactive surface area by 11 times compared with a bare platinum-iridium electrode (p < 0.05). Electrochemical behavior during chitosan actuation (pH-stimulated osmotic swelling) was characterized with three different redox probes (positive, neutral, and negative charge) above and below the isoelectric point of chitosan. These results showed that using a negatively charged redox probe led to the highest electroactive surface area, corroborating previous studies of stimulus-response polymers on metal electrodes. Following this material characterization, CHI/Pt brushes were functionalized with aptamers selective for L. monocytogenes capture. These aptasensors were functional at concentrations up to 106 CFU/mL with no preconcentration nor extraneous reagent addition. Selectivity was assessed in the presence of other Gram-positive bacteria (Staphylococcus aureus) and with a food product (chicken broth). Actuation led to improved L. monocytogenes detection with a low limit of detection (33 CFU/10 mL in chicken broth). The aptasensor developed herein offers a simple fabrication procedure with only one-step deposition followed by functionalization and rapid L. monocytogenes detection, with 15 min bacteria capture and 2 min sensing.
Collapse
Affiliation(s)
- Daniela A. Oliveira
- Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA; (D.A.O.); (S.A.)
| | - Suleiman Althawab
- Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA; (D.A.O.); (S.A.)
- Department of Nutrition and Food Science, Texas A&M University, College Station, TX 77843, USA
| | - Eric S. McLamore
- Department of Nutrition and Food Science, Texas A&M University, College Station, TX 77843, USA
| | - Carmen L. Gomes
- Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA; (D.A.O.); (S.A.)
- Department of Agricultural Sciences, Clemson University, Clemson, SC 26631, USA
| |
Collapse
|
6
|
Covalent attachment of three derivatives of pegylated RGD peptides on the NH2-terminated silicon surfaces: Impact on fibroblast cell behavior. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2021; 1863:183770. [PMID: 34517002 DOI: 10.1016/j.bbamem.2021.183770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 08/30/2021] [Accepted: 09/01/2021] [Indexed: 11/20/2022]
Abstract
This paper describes a simple strategy for covalent immobilization of the NHS-PEG-RGD peptide with the three different PEG lengths (8, 13, and 22) onto the amine-terminated monolayers with the subsequent investigation of fibroblast cellular response to the three derivatives of pegylated RGD peptides-modified substrates. First, acetamide-terminated monolayers were prepared on the hydride terminated silicon surface to protect NH2-terminated monolayers. This was followed by the removal of the protective groups, and the reaction of NHS-PEG8-RGD, NHS-PEG13-RGD and NHS-PEG22-RGD peptides with the NH2-terminated monolayers while reducing nonspecific protein adsorption. Analysis of X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared (ATR-FTIR) spectroscopy, and Ellipsometry measurements demonstrated that PEG13-RGD peptide forms relatively a more homogenous, thicker and stable structure compared with those of PEG8-RGD and PEG22-RGD peptide. The quantitative and qualitative assessment of cell adhesion, spreading, and proliferation indicated that relatively further elongated fibroblast cells attached on the PEG13-RGD peptide relative to those on the PEG8-RGD and PEG22-RGD peptide. The results presented here may offer a developed strategy based on the length of the spacer to regulate cellular behavior on the surface substrates.
Collapse
|
7
|
Electrochemical Development of an Immunosensor for Detection Polychlorinated biphenyls (PCBs) for Environmental Analysis. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9110307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Polychlorinated biphenyls (PCBs) are a highly toxic family of synthetic chemical compounds. PCBs are widely spread in the environment and their toxicity can cause serious ailments to living organisms such as cancer; therefore, developing a device for the detection of PCBs in the environment is significant. In this paper, polyclonal primary anti-PCB antibodies were immobilized onto a gold screen-printed electrode with the purpose of creating an electrochemical immunosensor for the detection of Aroclor 1254. It was modified with 11-mercaptoundecanoic acid (11-MUA) and the activation of the carboxylic acid terminal was performed by cross-linking 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hyrodsuccinmide (NHS) on the electrode surface. Cyclic voltammetry, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry, atomic force microscopy (AFM), scanning electron microscopy (SEM), and contact angle measurement were employed to characterize SAM development on the gold electrode. Using a competitive assay, a 0.09 ng/mL−1 limit of detection and a linear range of 0.101–220 ng/mL−1 were determined. The self-assembled monolayers (SAM) were successful in encapsulating the PCBs on the immunosensor. The electrochemical detection showed better resolution when compared to traditional methods such as the ELISA optical technique. The novel electrochemical immunosensor approach that is discussed in this paper has the potential to offer rapid sample screening in a portable, disposable format and could contribute to the effective control and prevention of PCBs in the environment.
Collapse
|
8
|
Sun Y, Gu Y, Jiang Y. Adsorption behavior of a tri-functionalized imprinted resin with high selectivity for 5-sulfosalicylic acid: Batch experiments and DFT calculation. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:125271. [PMID: 33548783 DOI: 10.1016/j.jhazmat.2021.125271] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/25/2021] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
The presence of aromatic compounds with multiple functional groups such as 5-sulfosalicylic acid (SSA) in water bodies is a threat to aquatic organisms and human health. Phenol (PH) with the -OH group, benzoic acid with -COOH and benzenesulfonic acid (BSA) with -SO3H can be considered as SSA structural unit. In this study, three functional monomers, namely, N-methylallylamine, diallylamine, and triallylamine, with strong affinity for PH, BA, and BSA, respectively, were selected from 16 monomers by using density functional theory (DFT). Molecularly imprinted resin (MIP-4) with tri-functional groups and excellent selectivity for SSA was synthesized using a macroporous polystyrene resin (NDA-1800) as the carrier. In binary systems, MIP-4 exhibited excellent imprinting effect and adsorption selectivity for SSA. X-ray spectroscopy data and DFT calculations illustrated that the adsorption of SSA on MIP-4 was mainly dependent on the strong electrostatic interaction between the protonated amine group on the resin and -SO3- of SSA, as well as, the hydrogen bond between the neutral amine group and -OH and -COOH of SSA; the order of the three functional groups in identification was -OH > -COOH > -SO3H. In addition, the adsorption performance of MIP-4 was retained after five adsorption-desorption cycles.
Collapse
Affiliation(s)
- Yue Sun
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
| | - Yingpeng Gu
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Yu Jiang
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
| |
Collapse
|
9
|
Buck E, Lee S, Stone LS, Cerruti M. Protein Adsorption on Surfaces Functionalized with COOH Groups Promotes Anti-inflammatory Macrophage Responses. ACS APPLIED MATERIALS & INTERFACES 2021; 13:7021-7036. [PMID: 33539069 DOI: 10.1021/acsami.0c16509] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Implants can induce a foreign body reaction that leads to chronic inflammation and fibrosis in the surrounding tissue. Macrophages help detect the foreign material, play a role in the inflammatory response, and may promote fibrosis instead of the desired tissue regeneration around implants. Implant surface properties impact macrophage responses by changing the nature of the adsorbed protein layer, but conflicting studies highlight the complexity of this relationship. In this study, the effect of surface chemistry on macrophage behavior was investigated with poly(styrene) surfaces containing common functional groups at similar surface densities. The protein layer was characterized to identify the proteins that adsorbed on the surfaces from the medium and the proteins secreted onto the surfaces by adherent macrophages. Of the surface chemistries studied, carboxylic acid (COOH) groups promoted anti-inflammatory responses from unstimulated macrophages and did not exacerbate inflammation upon stimulation. These surfaces also enhanced the adsorption of proteins involved in integrin signaling and promoted the secretion of proteins related to angiogenesis, integrin signaling, and cytokine signaling, which have been previously associated with improved biomaterial integration. Therefore, this study suggests that surface modification with COOH groups may help improve the integration of implants in the body by enhancing anti-inflammatory macrophage responses through altered protein adsorption.
Collapse
Affiliation(s)
- Emily Buck
- Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada
| | - Seunghwan Lee
- Faculty of Dentistry, McGill University, Montreal, QC H3A 1G1, Canada
- Alan Edwards Center for Research on Pain, McGill University, Montreal, QC H3A 0G1, Canada
| | - Laura S Stone
- Faculty of Dentistry, McGill University, Montreal, QC H3A 1G1, Canada
- Alan Edwards Center for Research on Pain, McGill University, Montreal, QC H3A 0G1, Canada
| | - Marta Cerruti
- Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada
| |
Collapse
|
10
|
Andersson MP, Hassenkam T, Matthiesen J, Nikolajsen LV, Okhrimenko DV, Dobberschütz S, Stipp SLS. First-Principles Prediction of Surface Wetting. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12451-12459. [PMID: 32975124 DOI: 10.1021/acs.langmuir.0c01241] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We have developed a method for predicting the solvation contribution to solid-liquid interfacial tension (IFT) based on density functional theory and the implicit solvent model COSMO-RS. Our method can be used to predict wetting behavior for a solid surface in contact with two liquids. We benchmarked our method against measurements of contact angle from water-in-oil on silica wafers and a range of self-assembled monolayers (SAMs) with different compositions, ranging from oil-wet to water-wet. We also compared our predictions to literature data for wetting of a polydimethylsilane surface. By explicitly including deprotonation for silica surfaces and carboxylic acid SAMs, very good agreement was obtained with experimental data for nearly all surfaces. Poor agreement was found for amine-terminated SAMs, which could be the result of both method and model insufficiencies and impurities known to be present for such surfaces. Solid-liquid IFT cannot be measured directly, making predictions such as from our method all the more important.
Collapse
Affiliation(s)
- M P Andersson
- Department of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - T Hassenkam
- Globe Institute, Section for Geobiology, University of Copenhagen, 2100 København Ø, Denmark
| | - J Matthiesen
- Nano-Science Center, Department of Chemistry, University of Copenhagen, 2100 København Ø, Denmark
| | - L V Nikolajsen
- Department of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - D V Okhrimenko
- ROCKWOOL International A/S, Hovedgaden 584, 2640 Hedehusene, Denmark
| | - S Dobberschütz
- Nano-Science Center, Department of Chemistry, University of Copenhagen, 2100 København Ø, Denmark
| | - S L S Stipp
- Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| |
Collapse
|
11
|
Li C, Chen Z, Yi H, Cao Y, Du L, Hu Y, Kong F, Kramer Campen R, Gao Y, Du C, Yin G, Zhang IY, Tong Y. Polyvinylpyrrolidone-Coordinated Single-Site Platinum Catalyst Exhibits High Activity for Hydrogen Evolution Reaction. Angew Chem Int Ed Engl 2020; 59:15902-15907. [PMID: 32436325 PMCID: PMC7539980 DOI: 10.1002/anie.202005282] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 05/19/2020] [Indexed: 11/17/2022]
Abstract
The essence of developing a Pt-based single-atom catalyst (SAC) for hydrogen evolution reaction (HER) is the preparation of well-defined and stable single Pt sites with desired electrocatalytic efficacy. Herein, we report a facile approach to generate uniformly dispersed Pt sites with outstanding HER performance via a photochemical reduction method using polyvinylpyrrolidone (PVP) molecules as the key additive to significantly simplify the synthesis and enhance the catalytic performance. The as-prepared catalyst displays remarkable kinetic activities (20 times higher current density than the commercially available Pt/C) with excellent stability (76.3 % of its initial activity after 5000 cycles) for HER. EXAFS measurements and DFT calculations demonstrate a synergetic effect, where the PVP ligands and the support together modulate the electronic structure of the Pt atoms, which optimize the hydrogen adsorption energy, resulting in a considerably improved HER activity.
Collapse
Affiliation(s)
- Can Li
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
- Fritz Haber Institute of the Max Planck SocietyFaradayweg 4–614195BerlinGermany
| | - Zheng Chen
- Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsCollaborative Innovation Center of Chemistry for Energy MaterialsMOE Laboratory for Computational Physical ScienceDepartment of ChemistryFudan University200433ShanghaiChina
| | - Hong Yi
- College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China
| | - Yi Cao
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
| | - Lei Du
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
| | - Yidong Hu
- Department of ChemistryHefei National Laboratory for Physical Sciences at the MicroscaleiChEM (Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei230026China
| | - Fanpeng Kong
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
| | - Richard Kramer Campen
- Fritz Haber Institute of the Max Planck SocietyFaradayweg 4–614195BerlinGermany
- Faculty of PhysicsUniversity of Duisburg-EssenLotharstraße 147057DuisburgGermany
| | - Yunzhi Gao
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
| | - Chunyu Du
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
| | - Geping Yin
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageHarbin Institute of TechnologyHarbin150001China
| | - Igor Ying Zhang
- Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsCollaborative Innovation Center of Chemistry for Energy MaterialsMOE Laboratory for Computational Physical ScienceDepartment of ChemistryFudan University200433ShanghaiChina
| | - Yujin Tong
- Fritz Haber Institute of the Max Planck SocietyFaradayweg 4–614195BerlinGermany
- Faculty of PhysicsUniversity of Duisburg-EssenLotharstraße 147057DuisburgGermany
| |
Collapse
|
12
|
Li C, Chen Z, Yi H, Cao Y, Du L, Hu Y, Kong F, Kramer Campen R, Gao Y, Du C, Yin G, Zhang IY, Tong Y. Polyvinylpyrrolidone‐Coordinated Single‐Site Platinum Catalyst Exhibits High Activity for Hydrogen Evolution Reaction. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005282] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Can Li
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
- Fritz Haber Institute of the Max Planck Society Faradayweg 4–6 14195 Berlin Germany
| | - Zheng Chen
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy Materials MOE Laboratory for Computational Physical Science Department of Chemistry Fudan University 200433 Shanghai China
| | - Hong Yi
- College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Yi Cao
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
| | - Lei Du
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
| | - Yidong Hu
- Department of Chemistry Hefei National Laboratory for Physical Sciences at the Microscale iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) University of Science and Technology of China Hefei 230026 China
| | - Fanpeng Kong
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
| | - Richard Kramer Campen
- Fritz Haber Institute of the Max Planck Society Faradayweg 4–6 14195 Berlin Germany
- Faculty of Physics University of Duisburg-Essen Lotharstraße 1 47057 Duisburg Germany
| | - Yunzhi Gao
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
| | - Chunyu Du
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
| | - Geping Yin
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of Technology Harbin 150001 China
| | - Igor Ying Zhang
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy Materials MOE Laboratory for Computational Physical Science Department of Chemistry Fudan University 200433 Shanghai China
| | - Yujin Tong
- Fritz Haber Institute of the Max Planck Society Faradayweg 4–6 14195 Berlin Germany
- Faculty of Physics University of Duisburg-Essen Lotharstraße 1 47057 Duisburg Germany
| |
Collapse
|
13
|
Engstrom AM, Faase RA, Marquart GW, Baio JE, Mackiewicz MR, Harper SL. Size-Dependent Interactions of Lipid-Coated Gold Nanoparticles: Developing a Better Mechanistic Understanding Through Model Cell Membranes and in vivo Toxicity. Int J Nanomedicine 2020; 15:4091-4104. [PMID: 32606666 PMCID: PMC7295544 DOI: 10.2147/ijn.s249622] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 05/13/2020] [Indexed: 01/13/2023] Open
Abstract
Introduction Humans are intentionally exposed to gold nanoparticles (AuNPs) where they are used in variety of biomedical applications as imaging and drug delivery agents as well as diagnostic and therapeutic agents currently in clinic and in a variety of upcoming clinical trials. Consequently, it is critical that we gain a better understanding of how physiochemical properties such as size, shape, and surface chemistry drive cellular uptake and AuNP toxicity in vivo. Understanding and being able to manipulate these physiochemical properties will allow for the production of safer and more efficacious use of AuNPs in biomedical applications. Methods and Materials Here, AuNPs of three sizes, 5 nm, 10 nm, and 20 nm, were coated with a lipid bilayer composed of sodium oleate, hydrogenated phosphatidylcholine, and hexanethiol. To understand how the physical features of AuNPs influence uptake through cellular membranes, sum frequency generation (SFG) was utilized to assess the interactions of the AuNPs with a biomimetic lipid monolayer composed of a deuterated phospholipid 1.2-dipalmitoyl-d62-sn-glycero-3-phosphocholine (dDPPC). Results and Discussion SFG measurements showed that 5 nm and 10 nm AuNPs are able to phase into the lipid monolayer with very little energetic cost, whereas, the 20 nm AuNPs warped the membrane conforming it to the curvature of hybrid lipid-coated AuNPs. Toxicity of the AuNPs were assessed in vivo to determine how AuNP curvature and uptake influence cell health. In contrast, in vivo toxicity tested in embryonic zebrafish showed rapid toxicity of the 5 nm AuNPs, with significant 24 hpf mortality occurring at concentrations ≥20 mg/L, whereas the 10 nm and 20 nm AuNPs showed no significant mortality throughout the five-day experiment. Conclusion By combining information from membrane models using SFG spectroscopy with in vivo toxicity studies, a better mechanistic understanding of how nanoparticles (NPs) interact with membranes is developed to understand how the physiochemical features of AuNPs drive nanoparticle-membrane interactions, cellular uptake, and toxicity.
Collapse
Affiliation(s)
- Arek M Engstrom
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, United States
| | - Ryan A Faase
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, United States
| | - Grant W Marquart
- Department of Chemistry, Portland State University, Portland, OR, United States
| | - Joe E Baio
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, United States
| | | | - Stacey L Harper
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, United States.,School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, United States.,Oregon Nanoscience and Microtechnologies Institute, Corvallis, OR, United States
| |
Collapse
|
14
|
Krounbi L, Enders A, Anderton CR, Engelhard MH, Hestrin R, Torres-Rojas D, Dynes JJ, Lehmann J. Sequential Ammonia and Carbon Dioxide Adsorption on Pyrolyzed Biomass to Recover Waste Stream Nutrients. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2020; 8:7121-7131. [PMID: 32421071 PMCID: PMC7218926 DOI: 10.1021/acssuschemeng.0c01427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/29/2020] [Indexed: 06/11/2023]
Abstract
The amine-rich surfaces of pyrolyzed human solid waste (py-HSW) can be "primed" or "regenerated" with carbon dioxide (CO2) to enhance their adsorption of ammonia (NH3) for use as a soil amendment. To better understand the mechanism by which CO2 exposure facilitates NH3 adsorption to py-HSW, we artificially enriched a model sorbent, pyrolyzed, oxidized wood (py-ox wood) with amine functional groups through exposure to NH3. We then exposed these N-enriched materials to CO2 and then resorbed NH3. The high heat of CO2 adsorption (Q st) on py-HSW, 49 kJ mol-1, at low surface coverage, 0.4 mmol CO2 g-1, showed that the naturally occurring N compounds in py-HSW have a high affinity for CO2. The Q st of CO2 on py-ox wood also increased after exposure to NH3, reaching 50 kJ mol-1 at 0.7 mmol CO2 g-1, demonstrating that the incorporation of N-rich functional groups by NH3 adsorption is favorable for CO2 uptake. Adsorption kinetics of py-ox wood revealed continued, albeit diminishing NH3 uptake after each CO2 treatment, averaging 5.9 mmol NH3 g-1 for the first NH3 exposure event and 3.5 and 2.9 mmol NH3 g-1 for the second and third; the electrophilic character of CO2 serves as a Lewis acid, enhancing surface affinity for NH3 uptake. Furthermore, penetration of 15NH3 and 13CO2 measured by NanoSIMS reached over 7 μm deep into both materials, explaining the large NH3 capture. We expected similar NH3 uptake in py-HSW sorbed with CO2 and py-ox wood because both materials, py-HSW and py-ox wood sorbed with NH3, had similar N contents and similarly high CO2 uptake. Yet NH3 sorption in py-HSW was unexpectedly low, apparently from potassium (K) bicarbonate precipitation, reducing interactions between NH3 and sorbed CO2; 2-fold greater surface K in py-HSW was detected after exposure to CO2 and NH3 than before gas exposure. We show that amine-rich pyrolyzed waste materials have high CO2 affinity, which facilitates NH3 uptake. However, high ash contents as found in py-HSW hinder this mechanism.
Collapse
Affiliation(s)
- Leilah Krounbi
- Soil
and Crop Sciences, College of Agriculture and Life Sciences, Cornell University, 306 Tower Road, Ithaca, New York 14853, United States
| | - Akio Enders
- Soil
and Crop Sciences, College of Agriculture and Life Sciences, Cornell University, 306 Tower Road, Ithaca, New York 14853, United States
| | - Christopher R. Anderton
- Environmental
Molecular Sciences Laboratory, Pacific Northwest
National Lab, 902 Battelle Boulevard, Richland, Washington 99354, United States
| | - Mark H. Engelhard
- Environmental
Molecular Sciences Laboratory, Pacific Northwest
National Lab, 902 Battelle Boulevard, Richland, Washington 99354, United States
| | - Rachel Hestrin
- Soil
and Crop Sciences, College of Agriculture and Life Sciences, Cornell University, 306 Tower Road, Ithaca, New York 14853, United States
| | - Dorisel Torres-Rojas
- Soil
and Crop Sciences, College of Agriculture and Life Sciences, Cornell University, 306 Tower Road, Ithaca, New York 14853, United States
| | - James J. Dynes
- Canadian
Light Source, 44 Innovation Blvd, Saskatoon, SK S7N 2V3, Canada
| | - Johannes Lehmann
- Soil
and Crop Sciences, College of Agriculture and Life Sciences, Cornell University, 306 Tower Road, Ithaca, New York 14853, United States
- Atkinson
Center for a Sustainable Future, Cornell
University, 200 Rice
Hall, Ithaca, New York 14853, United States
| |
Collapse
|
15
|
Cimino M, Parreira P, Bidarra SJ, Gonçalves RM, Barrias CC, Martins MCL. Effect of surface chemistry on hMSC growth under xeno-free conditions. Colloids Surf B Biointerfaces 2020; 189:110836. [DOI: 10.1016/j.colsurfb.2020.110836] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 01/17/2020] [Accepted: 01/29/2020] [Indexed: 01/05/2023]
|
16
|
A versatile approach to antimicrobial coatings via metal-phenolic networks. Colloids Surf B Biointerfaces 2020; 187:110771. [DOI: 10.1016/j.colsurfb.2020.110771] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 11/10/2019] [Accepted: 01/01/2020] [Indexed: 11/23/2022]
|
17
|
Otsuka Y, Nishijima S, Sakamoto L, Kajimoto K, Araki K, Misaka T, Ohoyama H, Matsumoto T. Chemical Control of Electronic Coupling between a Ruthenium Complex and Gold Electrode for Resonant Tunneling Conduction. ACS APPLIED MATERIALS & INTERFACES 2019; 11:24331-24338. [PMID: 31252449 DOI: 10.1021/acsami.9b05569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Current-voltage (I-V) nonlinearity is essential for information processing in molecular electronics. We used a nanoparticle bridge junction to investigate the effect of electronic coupling between a Ru complex and electrodes on nonlinear electrical properties. Two types of molecular layers, in which the Ru complex forms different chemical bondings to the electrode, were used for electrical measurements. The chemical bond and the surface potential of the Ru complex on Au electrodes were examined by X-ray photoelectron spectroscopy, infrared ray reflection absorbance spectroscopy and Kelvin probe force microscopy, respectively. The device, in which the Ru complex is directly bound to the Au electrode, indicated the nonlinear I-V characteristics with zero-bias conductance because of the direct tunneling conduction. Another device fabricated by inserting a spacer molecule between the Ru complex and the Au electrode realized nonlinear I-V characteristics with a clear threshold voltage and little zero-bias conductance. The I-V curves were well fitted by the resonant tunneling conduction model. The present results show the significance of controlling the electronic coupling for nonlinear I-V characteristics.
Collapse
Affiliation(s)
- Yoichi Otsuka
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Satoshi Nishijima
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Leo Sakamoto
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Kentaro Kajimoto
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Kento Araki
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Tomoki Misaka
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Hiroshi Ohoyama
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| | - Takuya Matsumoto
- Department of Chemistry, Graduate School of Science , Osaka University , 1-1 Machikaneyama-cho , Toyonaka , Osaka , Japan
| |
Collapse
|
18
|
Structure of von Willebrand factor A1 on polystyrene determined from experimental and calculated sum frequency generation spectra. Biointerphases 2018; 13:06E411. [PMID: 30551688 DOI: 10.1116/1.5056219] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The blood-clotting protein von Willebrand factor (vWF) can be activated by small molecules, high shear stress, and interactions with interfaces. It subsequently binds platelet receptor glycoprotein Ibα (GPIbα) at the surface of platelets, thereby playing a crucial role in blood clotting due to platelet activation, which is an important process to consider in the design of cardiovascular implants and biomaterials used in blood-contacting applications. The influence of surfaces on the activation and the molecular-level structure of surface-bound vWF is largely unknown. Recent studies have indicated that when bound to hydrophobic polystyrene (PS), the A1 domain of vWF remains accessible for GPIbα binding. However, the detailed secondary structure and exact orientation of vWF A1 at the PS surface is still unresolved. Here, the authors resolve these features by studying the system with sum-frequency generation (SFG) spectroscopy. The data are consistent with a scenario where vWF A1 maintains a native secondary structure when bound to PS. Comparison of experimental and calculated SFG spectra combined with previously reported time-of-flight secondary ion mass spectrometry data suggests that A1 assumes an orientation with the GPIbα binding domain oriented away from the solid surface and exposed to the solution phase. This structural information will benefit future in vitro experiments with surface-adsorbed A1 domain and may have relevance for the design of novel blood-contacting biomaterials and wound-healing applications.
Collapse
|
19
|
Kankate L, Hamann T, Li S, Moskaleva LV, Gölzhäuser A, Turchanin A, Swiderek P. Tracking down the origin of peculiar vibrational spectra of aromatic self-assembled thiolate monolayers. Phys Chem Chem Phys 2018; 20:29918-29930. [PMID: 30475374 DOI: 10.1039/c8cp03651a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several studies have previously observed surprisingly low frequencies for the C-H stretching modes of self-assembled monolayers (SAMs) prepared from aromatic thiols. The reason for this property has so far remained elusive. Therefore, we report a novel study of the vibrational spectra of SAMs prepared on Au from two different aromatic thiols, namely, 4'-nitro-1,1'-biphenyl-4-thiol (NBPT) and 4-aminothiophenol (ATP). The SAMs were prepared by vapor deposition (VD) in ultrahigh vacuum (UHV) as well as by the solution method (SM) and their quality was controlled by X-ray photoelectron spectroscopy (XPS). In addition, amino terminated SAMs were also obtained by electron irradiation and by chemical reduction of NBPT SAMs. Beside infrared reflection absorption spectroscopy (IRRAS), we have employed high resolution electron energy loss spectroscopy (HREELS), by which VD SAMs can be studied in situ, i.e. without exposing them to air. Hence, we can exclude possible contributions of solvent molecules to the vibrational spectra. Nonetheless, HREELS in fact reveals the same large red shift of the C-H stretching modes in the SAMs as also observed in ex situ IRRAS experiments. In contrast, HREELS for physisorbed ATP and ATP in a KBr pellet measured by transmission infrared spectroscopy exhibit the expected aromatic bands. Using a computational approach, we can exclude molecular packing effects as origin of this shift. Therefore, we propose chemical changes in the aromatic rings during SAM formation as an alternative explanation for the observed frequency shift. As another striking effect, the N-H stretching vibrational modes of the amino-terminated SAMs are extremely weak in both IRRAS and HREELS despite the fact that XPS confirms the presence of amino groups. A very weak signal is observed only in the case of an electron irradiated NBPT SAM. In contrast, an energy loss ascribed to the N-H stretching vibrations is clearly observed in HREELS of ATP physisorbed on an ATP SAM and on graphite as well as in the transmission infrared spectrum of ATP in KBr. The extremely low intensity of these vibrations in the SAM is traced back to the inherently low transition dipole moment for the excitation of N-H stretching modes in free N-H groups. Furthermore, the calculations suggest that the much stronger signals of N-H stretching modes involved in hydrogen-bonding with adjacent amino groups are suppressed because these vibrations are oriented parallel to the surface.
Collapse
Affiliation(s)
- Laxman Kankate
- University of Bremen, Faculty 2 (Chemistry/Biology), Institute of Applied and Physical Chemistry, Leobener Straße 5 (NW2), Postfach 330440, 28334 Bremen, Germany.
| | | | | | | | | | | | | |
Collapse
|
20
|
Hoang J, Park CS, Lee HJ, Marquez MD, Zenasni O, Gunaratne PH, Lee TR. Quaternary Ammonium-Terminated Films Formed from Mixed Bidentate Adsorbates Provide a High-Capacity Platform for Oligonucleotide Delivery. ACS APPLIED MATERIALS & INTERFACES 2018; 10:40890-40900. [PMID: 30335936 DOI: 10.1021/acsami.8b12244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The exposure of quaternary ammonium groups on surfaces allows self-assembled monolayers (SAMs) to serve as architectural platforms for immobilizing oligonucleotides. The current study describes the preparation of SAMs derived from four unique bidentate adsorbates containing two different ammonium termini (i.e., trimethyl- and triethyl-) and comparison to their monodentate analogs. Our studies found that SAMs derived from the bidentate adsorbates offered considerable enhancements in oligonucleotide binding when compared to SAMs derived from their monodentate analogs. The generated SAMs were analyzed using ellipsometry, X-ray photoelectron spectroscopy, contact angle goniometry, polarization modulation infrared reflection-absorption spectroscopy, and electrochemical quartz crystal microbalance. These analyses showed that the immobilization of oligonucleotides was affected by changes in the terminal functionalities and the relative packing densities of the monolayers. In efforts to enhance further the immobilization of oligonucleotides on these SAM surfaces, we explored the use of adsorbates having aliphatic linkers with systematically varying chain lengths to form binary SAMs on gold. Mixed monolayers with 50:50 ratios of adsorbates showed the greatest oligonucleotide binding. These studies lay the groundwork for oligonucleotide delivery using gold-based nanoparticles and nanoshells.
Collapse
Affiliation(s)
- Johnson Hoang
- Department of Biology and Biochemistry , University of Houston , Houston , Texas 77204-5001 , United States
| | - Chul Soon Park
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity , University of Houston , Houston , Texas 77204-5003 , United States
| | - Han Ju Lee
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity , University of Houston , Houston , Texas 77204-5003 , United States
| | - Maria D Marquez
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity , University of Houston , Houston , Texas 77204-5003 , United States
| | - Oussama Zenasni
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity , University of Houston , Houston , Texas 77204-5003 , United States
| | - Preethi H Gunaratne
- Department of Biology and Biochemistry , University of Houston , Houston , Texas 77204-5001 , United States
| | - T Randall Lee
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity , University of Houston , Houston , Texas 77204-5003 , United States
| |
Collapse
|
21
|
XPS Analysis of 2- and 3-Aminothiophenol Grafted on Silicon (111) Hydride Surfaces. MOLECULES (BASEL, SWITZERLAND) 2018; 23:molecules23102712. [PMID: 30347868 PMCID: PMC6222732 DOI: 10.3390/molecules23102712] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 10/18/2018] [Accepted: 10/19/2018] [Indexed: 11/16/2022]
Abstract
Following on from our previous study on the resonance/inductive structures of ethynylaniline, this report examines similar effects arising from resonance structures with aromatic aminothiophenol with dual electron-donating substituents. In brief, 2- and 3-aminothiophenol were thermally grafted on silicon (111) hydride substrate at 130 °C under nonpolar aprotic mesitylene. From the examination of high resolution XPS Si2p, N1s, and S2p spectrum, it was noticed that there was a strong preference of NH₂ over SH to form Si⁻N linkage on the silicon hydride surface for 2-aminothiophenol. However, for 3-aminothiophenol, there was a switch in reactivity of the silicon hydride toward SH group. This was attributed to the antagonistic and cooperative resonance effects for 2- and 3-aminothiophenol, respectively. The data strongly suggested that the net resonance of the benzylic-based compound could have played an important role in the net distribution of negative charge along the benzylic framework and subsequently influenced the outcome of the surface reaction. To the best of the authors' knowledge, this correlation between dual electron-donating substituents and the outcome of the nucleophilic addition toward silicon hydride surfaces has not been described before in literature.
Collapse
|
22
|
Todea M, Muresan-Pop M, Simon S, Moisescu-Goia C, Simon V, Eniu D. XPS investigation of new solid forms of 5-fluorouracil with piperazine. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.122] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
23
|
Phenylamide-oxime and phenylamide nanolayer covalently grafted carbon via electroreduction of the corresponding diazonium salts for detection of nickel ions. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.03.045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
24
|
Cortez ML, Lorenzo A, Marmisollé WA, von Bilderling C, Maza E, Pietrasanta L, Battaglini F, Ceolín M, Azzaroni O. Highly-organized stacked multilayers via layer-by-layer assembly of lipid-like surfactants and polyelectrolytes. Stratified supramolecular structures for (bio)electrochemical nanoarchitectonics. SOFT MATTER 2018; 14:1939-1952. [PMID: 29479625 DOI: 10.1039/c8sm00052b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Supramolecular self-assembly is of paramount importance for the development of novel functional materials with molecular-level feature control. In particular, the interest in creating well-defined stratified multilayers through simple methods using readily available building blocks is motivated by a multitude of research activities in the field of "nanoarchitectonics" as well as evolving technological applications. Herein, we report on the facile preparation and application of highly organized stacked multilayers via layer-by-layer assembly of lipid-like surfactants and polyelectrolytes. Polyelectrolyte multilayers with high degree of stratification of the internal structure were constructed through consecutive assembly of polyallylamine and dodecyl phosphate, a lipid-like surfactant that act as a structure-directing agent. We show that multilayers form well-defined lamellar hydrophilic/hydrophobic domains oriented parallel to the substrate. More important, X-ray reflectivity characterization conclusively revealed the presence of Bragg peaks up to fourth order, evidencing the highly stratified structure of the multilayer. Additionally, hydrophobic lamellar domains were used as hosts for ferrocene in order to create an electrochemically active film displaying spatially-addressed redox units. Stacked multilayers were then assembled integrating redox-tagged polyallylamine and glucose oxidase into the stratified hydrophilic domains. Bioelectrocatalysis and "redox wiring" in the presence of glucose was demonstrated to occur inside the stratified multilayer.
Collapse
Affiliation(s)
- M Lorena Cortez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET, La Plata, Argentina.
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Thambiraj S, Hema S, Ravi Shankaran D. Functionalized gold nanoparticles for drug delivery applications. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.matpr.2018.06.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
26
|
Enhanced capture of bacteria and endotoxin by antimicrobial WLBU2 peptide tethered on polyethylene oxide spacers. Biointerphases 2017; 12:05G603. [DOI: 10.1116/1.4997049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
27
|
Balakrishnan D, Lamblin G, Thomann JS, Guillot J, Duday D, van den Berg A, Olthuis W, Pascual-García C. Influence of polymerisation on the reversibility of low-energy proton exchange reactions by Para-Aminothiolphenol. Sci Rep 2017; 7:15401. [PMID: 29133808 PMCID: PMC5684359 DOI: 10.1038/s41598-017-13589-5] [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: 07/24/2017] [Accepted: 09/25/2017] [Indexed: 01/28/2023] Open
Abstract
The reversibility of redox processes is an important function for sensing and molecular electronic devices such as pH reporters or molecular switches. Here we report the electrochemical behaviour and redox reversibility of para-aminothiolphenol (PATP) after different polymerisation methods. We used electrochemical and photo-polymerisation in neutral buffers and plasma polymerisation in air to induce reversible redox states. The chemical stoichiometry and surface coverage of PATP in the polymerized layers were characterized by X-ray photoelectron spectroscopy (XPS), while cyclic voltammetry (CV) was used to measure the charge transfer, double layer capacitance and electrochemical rate of the layers during successive potential cycles. Our results show that the surface coverage of the redox active species is higher on electro-polymerised samples, however, after consecutive cycles all the methods converge to the same charge transfer, while the plasma polymerised samples achieve higher efficiency per molecule and UV polymerised samples have a higher electron transfer rate.
Collapse
Affiliation(s)
- Divya Balakrishnan
- Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, L-4422, Belvaux, Luxembourg
- BIOS-Lab on a chip group, MESA+ Institute of Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Guillaume Lamblin
- Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, L-4422, Belvaux, Luxembourg
| | - Jean Sebastien Thomann
- Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, L-4422, Belvaux, Luxembourg
| | - Jerome Guillot
- Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, L-4422, Belvaux, Luxembourg
| | - David Duday
- Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, L-4422, Belvaux, Luxembourg
| | - Albert van den Berg
- BIOS-Lab on a chip group, MESA+ Institute of Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Wouter Olthuis
- BIOS-Lab on a chip group, MESA+ Institute of Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE, Enschede, The Netherlands
| | - César Pascual-García
- Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, L-4422, Belvaux, Luxembourg.
| |
Collapse
|
28
|
Winkler AL, Koenig M, Welle A, Trouillet V, Kratzer D, Hussal C, Lahann J, Lee-Thedieck C. Bioinstructive Coatings for Hematopoietic Stem Cell Expansion Based on Chemical Vapor Deposition Copolymerization. Biomacromolecules 2017; 18:3089-3098. [DOI: 10.1021/acs.biomac.7b00743] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | - Joerg Lahann
- Department
of Chemical Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | | |
Collapse
|
29
|
Tu Q, Kim HS, Oweida TJ, Parlak Z, Yingling YG, Zauscher S. Interfacial Mechanical Properties of Graphene on Self-Assembled Monolayers: Experiments and Simulations. ACS APPLIED MATERIALS & INTERFACES 2017; 9:10203-10213. [PMID: 28230343 DOI: 10.1021/acsami.6b16593] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Self-assembled monolayers (SAMs) have been widely used to engineer the electronic properties of substrate-supported graphene devices. However, little is known about how the surface chemistry of SAMs affects the interfacial mechanical properties of graphene supported on SAMs. Fluctuations and changes in these properties affect the stress transfer between substrate and the supported graphene and thus the performance of graphene-based devices. The changes in interfacial mechanical properties can be characterized by measuring the out-of-plane elastic properties. Combining contact resonance atomic force microcopy experiments with molecular dynamics simulations, we show that the head group chemistry of a SAM, which affects the interfacial interactions, can have a significant effect on the out-of-plane elastic modulus of the graphene-SAM heterostructure. Graphene supported on hydrophobic SAMs leads to heterostructures stiffer than those of graphene supported on hydrophilic SAMs, which is largely due to fewer water molecules present at the graphene-SAM interface. Our results provide an important, and often overlooked, insight into the mechanical properties of substrate-supported graphene electronics.
Collapse
Affiliation(s)
- Qing Tu
- Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States
- NSF Research Triangle, Materials Research Science and Engineering Center , Durham, North Carolina 27708, United States
| | - Ho Shin Kim
- NSF Research Triangle, Materials Research Science and Engineering Center , Durham, North Carolina 27708, United States
- Department of Materials Science and Engineering, North Carolina State University , Raleigh, North Carolina 27695, United States
| | - Thomas J Oweida
- Department of Materials Science and Engineering, North Carolina State University , Raleigh, North Carolina 27695, United States
| | - Zehra Parlak
- Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States
| | - Yaroslava G Yingling
- NSF Research Triangle, Materials Research Science and Engineering Center , Durham, North Carolina 27708, United States
- Department of Materials Science and Engineering, North Carolina State University , Raleigh, North Carolina 27695, United States
| | - Stefan Zauscher
- Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States
- NSF Research Triangle, Materials Research Science and Engineering Center , Durham, North Carolina 27708, United States
| |
Collapse
|
30
|
Koenig M, Kumar R, Hussal C, Trouillet V, Barner L, Lahann J. pH‐Responsive Aminomethyl Functionalized Poly(
p
‐xylylene) Coatings by Chemical Vapor Deposition Polymerization. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201600521] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Meike Koenig
- Institute of Functional Interfaces (IFG) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany
| | - Ramya Kumar
- Biointerfaces Institute University of Michigan (UM) Ann Arbor MI 48109 USA
| | - Christoph Hussal
- Institute of Functional Interfaces (IFG) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany
| | - Vanessa Trouillet
- Institute for Applied Materials (IAM) and Karlsruhe Nano Micro Facility (KNMF) Karlsruhe Institute of Technology (KIT) 76344 Eggenstein‐Leopoldshafen Germany
| | - Leonie Barner
- Institute of Functional Interfaces (IFG) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany
- Institute of Biological Interfaces (IBG) Karlsruhe Institute of Technology (KIT) 76344 Eggenstein‐Leopoldshafen Germany
| | - Joerg Lahann
- Institute of Functional Interfaces (IFG) Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany
- Biointerfaces Institute University of Michigan (UM) Ann Arbor MI 48109 USA
| |
Collapse
|
31
|
Meroni D, Lo Presti L, Di Liberto G, Ceotto M, Acres RG, Prince KC, Bellani R, Soliveri G, Ardizzone S. A Close Look at the Structure of the TiO 2-APTES Interface in Hybrid Nanomaterials and Its Degradation Pathway: An Experimental and Theoretical Study. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:430-440. [PMID: 28191270 PMCID: PMC5295244 DOI: 10.1021/acs.jpcc.6b10720] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/09/2016] [Indexed: 05/11/2023]
Abstract
The surface functionalization of TiO2-based materials with alkylsilanes is attractive in several cutting-edge applications, such as photovoltaics, sensors, and nanocarriers for the controlled release of bioactive molecules. (3-Aminopropyl)triethoxysilane (APTES) is able to self-assemble to form monolayers on TiO2 surfaces, but its adsorption geometry and solar-induced photodegradation pathways are not well understood. We here employ advanced experimental (XPS, NEXAFS, AFM, HR-TEM, and FT-IR) and theoretical (plane-wave DFT) tools to investigate the preferential interaction mode of APTES on anatase TiO2. We demonstrate that monomeric APTES chemisorption should proceed through covalent Si-O-Ti bonds. Although dimerization of the silane through Si-O-Si bonds is possible, further polymerization on the surface is scarcely probable. Terminal amino groups are expected to be partially involved in strong charge-assisted hydrogen bonds with surface hydroxyl groups of TiO2, resulting in a reduced propensity to react with other species. Solar-induced mineralization proceeds through preferential cleavage of the alkyl groups, leading to the rapid loss of the terminal NH2 moieties, whereas the Si-bearing head of APTES undergoes slower oxidation and remains bound to the surface. The suitability of employing the silane as a linker with other chemical species is discussed in the context of controlled degradation of APTES monolayers for drug release and surface patterning.
Collapse
Affiliation(s)
- Daniela Meroni
- Department
of Chemistry, Università degli Studi
di Milano, Via Golgi
19, 20133 Milano, Italy
- Consorzio INSTM, Via
Giusti 9, 50121 Firenze, Italy
- E-mail:
| | - Leonardo Lo Presti
- Department
of Chemistry, Università degli Studi
di Milano, Via Golgi
19, 20133 Milano, Italy
- Center for Materials
Crystallography, Aarhus University, Langelandsgade 140, DK-8000 Aarhus, Denmark
- E-mail:
| | - Giovanni Di Liberto
- Department
of Chemistry, Università degli Studi
di Milano, Via Golgi
19, 20133 Milano, Italy
| | - Michele Ceotto
- Department
of Chemistry, Università degli Studi
di Milano, Via Golgi
19, 20133 Milano, Italy
- Consorzio INSTM, Via
Giusti 9, 50121 Firenze, Italy
- E-mail:
| | - Robert G. Acres
- Imaging
and Medical
Beamline, Australian Synchrotron, Clayton, Victoria, Australia 3168
| | - Kevin C. Prince
- Elettra-Sincrotrone
Trieste, 34149 Basovizza, Trieste, Italy
- Molecular
Model Discovery Laboratory, Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne 3122, Australia
- Istituto Officina
dei Materiali, Consiglio Nazionale delle Ricerche, 34149 Basovizza, Italy
| | - Roberto Bellani
- Department
of Chemistry, Università degli Studi
di Milano, Via Golgi
19, 20133 Milano, Italy
| | - Guido Soliveri
- Department
of Engineering Physics, Polytechnique Montréal, H3T 1J4 Montreal, Canada
| | - Silvia Ardizzone
- Department
of Chemistry, Università degli Studi
di Milano, Via Golgi
19, 20133 Milano, Italy
- Consorzio INSTM, Via
Giusti 9, 50121 Firenze, Italy
| |
Collapse
|
32
|
Wang J, Zhao L, Wei D, Wu W, Zhang J, Cheng X. Effects of Intercalated Molecules in Graphene Oxide on the Interlayer Channels for Anhydrous Proton Conduction. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b02677] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Jingtao Wang
- School
of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Liping Zhao
- School
of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Donghui Wei
- College
of Chemistry and Molecular Engineering, Centre of Computational Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Wenjia Wu
- School
of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Jie Zhang
- School
of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Xian Cheng
- School
of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| |
Collapse
|
33
|
Evidence of the Disassembly of α-Cyclodextrin-octylamine Inclusion Compounds Conjugated to Gold Nanoparticles via Thermal and Photothermal Effects. Molecules 2016; 21:molecules21111444. [PMID: 27801880 PMCID: PMC6273894 DOI: 10.3390/molecules21111444] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 10/14/2016] [Accepted: 10/19/2016] [Indexed: 12/05/2022] Open
Abstract
Cyclodextrin (CD) molecules form inclusion compounds (ICs), generating dimers that are capable of encapsulating molecules derived from long-chain hydrocarbons. The aim of this study is to evaluate the structural changes experienced by ICs in solution with increasing temperatures. For this, a nuclear magnetic resonance (1H-NMR) titration was performed to determinate the stoichiometric α-cyclodextrin (α-CD):octylamine (OA) 2:1 and binding constant (k = 2.16 M−2) of ICs. Solution samples of α-CD-OA ICs conjugated with gold nanoparticles (AuNPs) were prepared, and 1H-NMR spectra at different temperatures were recorded. Comparatively, 1H-NMR spectra of the sample irradiated with a laser with tunable wavelengths, with plasmons of conjugated AuNPs, were recorded. In this work, we present evidence of the disassembly of ICs conjugated with AuNPs. Thermal studies demonstrated that, at 114 °C, there are reversible rearrangements of the host and guests in the ICs in a solid state. Migration movements of the guest molecules from the CD cavity were monitored via temperature-dependent 1H-NMR, and were verified comparing the chemical shifts of octylamine dissolved in deuterated dimethylsulfoxide (DMSO-d6) with the OA molecule included in α-CD dissolved in the same solvent. It was observed that, at 117 °C, OA exited the α-CD cavity. CD IC dimer disassembly was also observed when the sample was irradiated with green laser light.
Collapse
|
34
|
Lobo Maza F, Grumelli D, Carro P, Vericat C, Kern K, Salvarezza RC. The role of the crystalline face in the ordering of 6-mercaptopurine self-assembled monolayers on gold. NANOSCALE 2016; 8:17231-17240. [PMID: 27714158 DOI: 10.1039/c6nr06148f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Well-ordered molecular films play an important role in nanotechnology, from device fabrication to surface patterning. Self-assembled monolayers (SAMs) of 6-mercaptopurine (6MP) on the Au(100)-(1 × 1) and Au(111)-(1 × 1) have been used to understand the interplay of molecule-substrate interactions for heterocyclic thiols capable of binding to the surface by two anchors, which spontaneously form a highly disordered film on Au(111). Our results reveal that for the same surface coverage the simple change of the substrate from Au(111)-(1 × 1) to Au(100)-(1 × 1) eliminates molecular disorder and yields well-ordered SAMs. We discuss these findings in terms of differences in the surface mobility of 6MP species on these surfaces, the energetics of the adsorption sites, and the number of degrees of freedom of these substrates for a molecule with reduced surface mobility resulting from its two surface anchors. These results reveal the presence of subtle molecule-substrate interactions involving the heteroatom that drastically alter SAM properties and therefore strongly impact on our ability to control physical properties and to build devices at the nanoscale.
Collapse
Affiliation(s)
- Flavia Lobo Maza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET- Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina.
| | - Doris Grumelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET- Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina.
| | - Pilar Carro
- Área de Química Física, Departamento de Química, Facultad de Ciencias, Universidad de La Laguna, Instituto de Materiales y Nanotecnología, Avda. Francisco Sánchez, s/n 38071-La Laguna, Tenerife, Spain
| | - Carolina Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET- Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina.
| | - Klaus Kern
- Max Planck Institute FKF, Stuttgart, Germany and EPFL, Lausanne, Switzerland
| | - Roberto C Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET- Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina.
| |
Collapse
|
35
|
Wigzell J, Racovita R, Stentiford B, Wilson M, Harris M, Fletcher I, Mosquin D, Justice D, Beaumont S, Jetter R, Badyal J. Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.06.058] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
36
|
Böke F, Giner I, Keller A, Grundmeier G, Fischer H. Plasma-Enhanced Chemical Vapor Deposition (PE-CVD) yields better Hydrolytical Stability of Biocompatible SiOx Thin Films on Implant Alumina Ceramics compared to Rapid Thermal Evaporation Physical Vapor Deposition (PVD). ACS APPLIED MATERIALS & INTERFACES 2016; 8:17805-17816. [PMID: 27299181 DOI: 10.1021/acsami.6b04421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Densely sintered aluminum oxide (α-Al2O3) is chemically and biologically inert. To improve the interaction with biomolecules and cells, its surface has to be modified prior to use in biomedical applications. In this study, we compared two deposition techniques for adhesion promoting SiOx films to facilitate the coupling of stable organosilane monolayers on monolithic α-alumina; physical vapor deposition (PVD) by thermal evaporation and plasma enhanced chemical vapor deposition (PE-CVD). We also investigated the influence of etching on the formation of silanol surface groups using hydrogen peroxide and sulfuric acid solutions. The film characteristics, that is, surface morphology and surface chemistry, as well as the film stability and its adhesion properties under accelerated aging conditions were characterized by means of X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), inductively coupled plasma-optical emission spectroscopy (ICP-OES), and tensile strength tests. Differences in surface functionalization were investigated via two model organosilanes as well as the cell-cytotoxicity and viability on murine fibroblasts and human mesenchymal stromal cells (hMSC). We found that both SiOx interfaces did not affect the cell viability of both cell types. No significant differences between both films with regard to their interfacial tensile strength were detected, although failure mode analyses revealed a higher interfacial stability of the PE-CVD films compared to the PVD films. Twenty-eight day exposure to simulated body fluid (SBF) at 37 °C revealed a partial delamination of the thermally deposited PVD films whereas the PE-CVD films stayed largely intact. SiOx layers deposited by both PVD and PE-CVD may thus serve as viable adhesion-promoters for subsequent organosilane coupling agent binding to α-alumina. However, PE-CVD appears to be favorable for long-term direct film exposure to aqueous solutions.
Collapse
Affiliation(s)
- Frederik Böke
- Department of Dental Materials and Biomaterials Research, RWTH Aachen University Hospital , Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Ignacio Giner
- Technical and Macromolecular Chemistry, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Adrian Keller
- Technical and Macromolecular Chemistry, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Guido Grundmeier
- Technical and Macromolecular Chemistry, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Horst Fischer
- Department of Dental Materials and Biomaterials Research, RWTH Aachen University Hospital , Pauwelsstrasse 30, 52074 Aachen, Germany
| |
Collapse
|
37
|
Mescola A, Canale C, Prato M, Diaspro A, Berdondini L, Maccione A, Dante S. Specific Neuron Placement on Gold and Silicon Nitride-Patterned Substrates through a Two-Step Functionalization Method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6319-6327. [PMID: 27268249 DOI: 10.1021/acs.langmuir.6b01352] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The control of neuron-substrate adhesion has been always a challenge for fabricating neuron-based cell chips and in particular for multielectrode array (MEA) devices, which warrants the investigation of the electrophysiological activity of neuronal networks. The recent introduction of high-density chips based on the complementary metal oxide semiconductor (CMOS) technology, integrating thousands of electrodes, improved the possibility to sense large networks and raised the challenge to develop newly adapted functionalization techniques to further increase neuron electrode localization to avoid the positioning of cells out of the recording area. Here, we present a simple and straightforward chemical functionalization method that leads to the precise and exclusive positioning of the neural cell bodies onto modified electrodes and inhibits, at the same time, cellular adhesion in the surrounding insulator areas. Different from other approaches, this technique does not require any adhesion molecule as well as complex patterning technique such as μ-contact printing. The functionalization was first optimized on gold (Au) and silicon nitride (Si3N4)-patterned surfaces. The procedure consisted of the introduction of a passivating layer of hydrophobic silane molecules (propyltriethoxysilane [PTES]) followed by a treatment of the Au surface using 11-amino-1-undecanethiol hydrochloride (AT). On model substrates, well-ordered neural networks and an optimal coupling between a single neuron and single micrometric functionalized Au surface were achieved. In addition, we presented the preliminary results of this functionalization method directly applied on a CMOS-MEA: the electrical spontaneous spiking and bursting activities of the network recorded for up to 4 weeks demonstrate an excellent and stable neural adhesion and functional behavior comparable with what expected using a standard adhesion factor, such as polylysine or laminin, thus demonstrating that this procedure can be considered a good starting point to develop alternatives to the traditional chip coatings to provide selective and specific neuron-substrate adhesion.
Collapse
Affiliation(s)
- Andrea Mescola
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Claudio Canale
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Mirko Prato
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Alberto Diaspro
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Luca Berdondini
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Alessandro Maccione
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Silvia Dante
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| |
Collapse
|
38
|
Mosebach B, Bayer FM, Fels CC, Voigt M, Oezkaya B, Pomorska A, Torun B, Keller A, Grundmeier G. Adsorption and adhesion studies of PdSn-nanoparticles on protonated amine and carboxylic acid-terminated surfaces. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.6016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bastian Mosebach
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| | | | | | - Markus Voigt
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| | - Berkem Oezkaya
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| | - Agata Pomorska
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| | - Boray Torun
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| | - Adrian Keller
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| | - Guido Grundmeier
- University of Paderborn; Warburger str. 100 Paderborn 33098 Germany
| |
Collapse
|
39
|
Dolinska J, Chidambaram A, Taleat Z, Adamkiewicz W, Lisowski W, Palys B, Holdynski M, Andryszewski T, Sashuk V, Rassaei L, Opallo M. Decoration of MoS2 Nanopetal Stacks with Positively Charged Gold Nanoparticles for Synergistic Electrocatalytic Oxidation of Biologically Relevant Compounds. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.09.139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
40
|
Varol HS, Sánchez MA, Lu H, Baio JE, Malm C, Encinas N, Mermet-Guyennet MRB, Martzel N, Bonn D, Bonn M, Weidner T, Backus EHG, Parekh SH. Multiscale Effects of Interfacial Polymer Confinement in Silica Nanocomposites. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01111] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | | | | | - Joe E. Baio
- School of
Chemical,
Biological and Environmental Engineering, Oregon State University, Corvalis, Oregon 97333, United States
| | | | | | | | - Nicolas Martzel
- Manufacture française
des pneumatiques MICHELIN, Site de Ladoux, 23 place Carmes Déchaux, 63040 Clermont-Ferrand, France
| | - Daniel Bonn
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | | | | | | | | |
Collapse
|
41
|
Cheng F, Li MY, Wang HQ, Lin DQ, Qu JP. Antibody-ligand interactions for hydrophobic charge-induction chromatography: a surface plasmon resonance study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3422-3430. [PMID: 25734470 DOI: 10.1021/la5044987] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This article describes the use of surface plasmon resonance (SPR) spectroscopy to study antibody-ligand interactions for hydrophobic charge-induction chromatography (HCIC) and its versatility in investigating the surface and solution factors affecting the interactions. Two density model surfaces presenting the HCIC ligand (mercapto-ethyl-pyridine, MEP) were prepared on Au using a self-assembly technique. The surface chemistry and structure, ionization, and protein binding of such model surfaces were characterized by X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS), contact-angle titration, and SPR, respectively. The influences of the surface and solution factors, e.g., ligand density, salt concentration, and solution pH, on protein adsorption were determined by SPR. Our results showed that ligand density affects both equilibrium and dynamic aspects of the interactions. Specifically, a dense ligand leads to an increase in binding strength, rapid adsorption, slow desorption, and low specificity. In addition, both hydrophobic interactions and hydrogen bonding contribute significantly to the protein adsorption at neutral pH, while the electrostatic repulsion is overwhelmed under acidic conditions. The hydrophobic interaction at a high concentration of lyotropic salt would cause drastic conformational changes in the adsorbed protein. Combined with the self-assembly technique, SPR proves to be a powerful tool for studying the interactions between an antibody and a chromatographic ligand.
Collapse
Affiliation(s)
| | - Ming-Yang Li
- §School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116023, China
| | | | - Dong-Qiang Lin
- ∥Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | | |
Collapse
|
42
|
Meyerbroeker N, Waske P, Zharnikov M. Amino-terminated biphenylthiol self-assembled monolayers as highly reactive molecular templates. J Chem Phys 2015; 142:101919. [DOI: 10.1063/1.4907942] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- N. Meyerbroeker
- Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - P. Waske
- Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - M. Zharnikov
- Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| |
Collapse
|
43
|
Lee HJ, Jamison AC, Lee TR. Boc-protected ω-amino alkanedithiols provide chemically and thermally stable amine-terminated monolayers on gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2136-2146. [PMID: 25631104 DOI: 10.1021/la5044359] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Four custom-designed bidentate adsorbates having either ammonium or Boc-protected amino termini and either methanethiol or ethanethioate headgroups were prepared for the purpose of generating amine-terminated self-assembled monolayers (SAMs) on evaporated gold surfaces. These adsorbates utilize a phenyl-based framework to connect the headgroups to a single hexadecyloxy chain, extending the amino functionality away from the surface of gold, providing two regions within the adsorbate structure where intermolecular interactions contribute to the stability of the fully formed thin film. The structural features of the resulting SAMs were characterized by ellipsometry, X-ray photoelectron spectroscopy, and polarization modulation infrared reflection-absorption spectroscopy. The collected data were compared to those of eight additional SAMs formed from analogous monodentate alkanethiols and alkanethioacetates having either a similar aromatic framework or a simple alkyl chain connecting the headgroup to the tailgroup. The analysis of the data obtained for the full set of SAMs revealed that both the tailgroup and headgroup influenced the formation of a well-packed monolayer, with the Boc-protected amine-terminated alkanethiols producing films with superior surface bonding and adsorbate packing as compared to those formed with ammonium tailgroups or alkanethioacetate headgroups. A comparison of the structural differences before and after deprotection of the Boc-protected amine-terminated thiolate SAMs revealed that the bidentate adsorbate was the most resistant to desorption during the Boc-deprotection procedure. Furthermore, solution-phase thermal desorption tests performed to evaluate the thermal stability of the Boc-deprotected amine-terminated alkanethiolate films provided further evidence of the enhanced stability associated with SAMs formed from these bidentate adsorbates.
Collapse
Affiliation(s)
- Han Ju Lee
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | | | | |
Collapse
|
44
|
Baio JE, Weidner T, Ramey D, Pruzinsky L, Castner DG. Probing the orientation of electrostatically immobilized cytochrome C by time of flight secondary ion mass spectrometry and sum frequency generation spectroscopy. Biointerphases 2013; 8:18. [PMID: 24706131 PMCID: PMC4000547 DOI: 10.1186/1559-4106-8-18] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 07/10/2013] [Indexed: 11/27/2022] Open
Abstract
By taking advantage of the electron pathway through the heme group in cytochrome c (CytoC) electrochemists have built sensors based upon CytoC immobilized onto metal electrodes. Previous studies have shown that the electron transfer rate through the protein is a function of the position of this heme group with respect to the electrode surface. In this study a detailed examination of CytoC orientation when electrostatically immobilized onto both amine (NH3+) and carboxyl (COO-) functionalized gold is presented. Protein coverage, on both surfaces, was monitored by the change in the atomic % N, as determined by x-ray photoelectron spectroscopy. Spectral features within the in situ sum frequency generation vibrational spectra, acquired for the protein interacting with positively and negatively charged surfaces, indicates that these electrostatic interactions do induce the protein into a well ordered film. Time of flight secondary ion mass spectrometry data demonstrated a clear separation between the two samples based on the intensity differences of secondary ions stemming from amino acids located asymmetrically within CytoC (cysteine: C2H6NS+; glutamic acid: C4H6NO+ and C4H8NO2+; leucine: C5H12N+). For a more quantitative examination of orientation, we developed a ratio comparing the sum of the intensities of secondary-ions stemming from the amino acid residues at either end of the protein. The 50 % increase in this ratio, observed between the protein covered NH3+ and COO- substrates, indicates opposite orientations of the CytoC on the two different surfaces.
Collapse
Affiliation(s)
- Joe E Baio
- National ESCA and Surface Analysis Center for Biomedical Problems, Department of Chemical Engineering, University of Washington, Seattle, USA,
| | | | | | | | | |
Collapse
|
45
|
Zhao Z, He Y, Yang H, Qu X, Lu X, Luo J. Aminosilanization nanoadhesive layer for nanoelectric circuits with porous ultralow dielectric film. ACS APPLIED MATERIALS & INTERFACES 2013; 5:6097-6107. [PMID: 23749192 DOI: 10.1021/am4009192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An ultrathin layer is investigated for its potential application of replacing conventional diffusion barriers and promoting interface adhesion for nanoelectric circuits with porous ultralow dielectrics. The porous ultralow dielectric (k ≈ 2.5) substrate is silanized by 3-aminopropyltrimethoxysilane (APTMS) to form the nanoadhesive layer by performing oxygen plasma modification and tailoring the silanization conditions appropriately. The high primary amine content is obtained in favor of strong interaction between amino groups and copper. And the results of leakage current measurements of metal-oxide-semiconductor capacitor structure demonstrate that the aminosilanization nanoadhesive layer can block copper diffusion effectively and guarantee the performance of devices. Furthermore, the results of four-point bending tests indicate that the nanoadhesive layer with monolayer structure can provide the satisfactory interface toughness up to 6.7 ± 0.5 J/m(2) for Cu/ultralow-k interface. Additionally, an annealing-enhanced interface toughness effect occurs because of the formation of Cu-N bonding and siloxane bridges below 500 °C. However, the interface is weakened on account of the oxidization of amines and copper as well as the breaking of Cu-N bonding above 500 °C. It is also found that APTMS nanoadhesive layer with multilayer structure provides relatively low interface toughness compared with monolayer structure, which is mainly correlated to the breaking of interlayer hydrogen bonding.
Collapse
Affiliation(s)
- Zhongkai Zhao
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | | | | | | | | | | |
Collapse
|
46
|
Flavel BS, Jasieniak M, Velleman L, Ciampi S, Luais E, Peterson JR, Griesser HJ, Shapter JG, Gooding JJ. Grafting of poly(ethylene glycol) on click chemistry modified Si(100) surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8355-8362. [PMID: 23790067 DOI: 10.1021/la400721c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Poly(ethylene glycol) (PEG) is one of the most extensively studied antifouling coatings due to its ability to reduce protein adsorption and improve biocompatibility. Although the use of PEG for antifouling coatings is well established, the stability and density of PEG layers are often inadequate to provide optimum antifouling properties. To improve on these shortcomings, we employed the stepwise construction of PEG layers onto a silicon surface. Acetylene-terminated alkyl monolayers were attached to nonoxidized crystalline silicon surfaces via a one-step hydrosilylation procedure with 1,8-nonadiyne. The acetylene-terminated surfaces were functionalized via a copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction of the surface-bound alkynes with an azide to produce an amine terminated layer. The amine terminated layer was then further conjugated with PEG to produce an antifouling surface. The antifouling surface properties were investigated by testing adsorption of human serum albumin (HSA) and lysozyme (Lys) onto PEG layers from phosphate buffer solutions. Detailed characterization of protein fouling was carried out with X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) combined with principal component analysis (PCA). The results revealed no fouling of albumin onto PEG coatings whereas the smaller protein lysozyme adsorbed to a very low extent.
Collapse
|
47
|
Marmisollé WA, Capdevila DA, de la Llave E, Williams FJ, Murgida DH. Self-assembled monolayers of NH2-terminated thiolates: order, pKa, and specific adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5351-5359. [PMID: 23560885 DOI: 10.1021/la304730q] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Self-assembled monolayers (SAMs) of amino-terminated alkanethiols on Au were characterized by a combination of electrochemical (LSV, CV, and EIS) and spectroscopic (XPS and SER) techniques. Clear correlations were obtained between the apparent surface pKa values determined by impedimetric titrations and order parameters such as the content of trans conformers in the SAMs. These results contrast with previous studies that exhibit dispersions of up to 6 pH units in the reported pKa values. In addition, we determined that inorganic and organic phosphate species bind specifically to these SAMs mediating adsorption and heterogeneous electron transfer of positively charged macromolecules such as cytochrome c.
Collapse
Affiliation(s)
- Waldemar A Marmisollé
- Departamento de Química Inorgánica, Analítica y Química Física and INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and CONICET, Ciudad Universitaria, pab. 2, piso 3, C1428EHA-Buenos Aires, Argentina
| | | | | | | | | |
Collapse
|
48
|
Baio JE, Jaye C, Fischer DA, Weidner T. Multiplexed orientation and structure analysis by imaging near-edge X-ray absorption fine structure (MOSAIX) for combinatorial surface science. Anal Chem 2013; 85:4307-10. [PMID: 23544501 DOI: 10.1021/ac4003479] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, as a technique, offers detailed information about the bonding environment of molecules at a surface. However, because it is a synchrotron based method, beam-time is limited and users must typically prioritize and narrowly define the scopes of experiments. In this study, we demonstrate a novel method that opens up the possibility of the use of large area NEXAFS imaging to pursue combinatorial studies. To explore the capabilities of the NIST full field NEXAFS microscope available at the National Synchrotron Light Source as a high throughput imaging instrument, we collected NEXAFS images from a sample array consisting of 144 different elements with a periodic sequence of different surface modifications. NEXAFS images collected from this model system illustrate how hyperspectral NEXAFS data can be used for parallel analysis of large numbers of samples either directly from the overall image or by extracting spectra from regions of interest.
Collapse
Affiliation(s)
- Joe E Baio
- Max Planck Institute for Polymer Research, Mainz, Germany
| | | | | | | |
Collapse
|
49
|
Glebe U, Baio JE, Árnadóttir L, Siemeling U, Weidner T. Molecular suction pads: self-assembled monolayers of subphthalocyaninatoboron complexes on gold. Chemphyschem 2013; 14:1155-60. [PMID: 23526805 DOI: 10.1002/cphc.201300074] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Indexed: 11/06/2022]
Abstract
Subphthalocyaninatoboron complexes with six long-chain alkylthio substituents in their periphery are applicable for the formation of self-assembled monolayers (SAMs) on gold. Such films are prepared from solution with the axially chlorido-substituted derivatives and characterised by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The results are in accord with the formation of SAMs assembled by the chemisorption of both covalently bound thiolate-type as well as coordinatively bound thioether units. The adsorbate molecules adopt an essentially flat adsorption geometry on the substrate, resembling a suction pad on a surface.
Collapse
Affiliation(s)
- Ulrich Glebe
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | | | | | | | | |
Collapse
|
50
|
Delafosse G, Merlen A, Clair S, Patrone L. A surface enhanced Raman spectroscopy study of aminothiophenol and aminothiophenol-C60 self-assembled monolayers: Evolution of Raman modes with experimental parameters. J Chem Phys 2012; 136:194704. [DOI: 10.1063/1.4717720] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|