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Charlton T, Guo EJ, Lavrik N, Fitzsimmons M. Liquid Helium as a reference may provide clarity for some neutron reflectometry experiments1. JOURNAL OF NEUTRON RESEARCH 2023. [DOI: 10.3233/jnr-220041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Neutron reflectometry experiments infer the variation of the scattering length density of a smooth planar film as a function of depth averaged over the lateral dimensions of the sample from the intensity of a neutron beam reflected by the sample. Because the phase information of the neutron wave function is not preserved by an intensity measurement, most analyses rely on comparisons of data to predictions from models. Such comparisons do not provide unique solutions and can yield erroneous conclusions. A real-world example is provided. We show that in some limited cases, measurements of a sample immersed in the vapor and liquid phases of Helium may improve model selection.
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Affiliation(s)
- T.C. Charlton
- Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, Tennessee, USA
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - N. Lavrik
- Center for Nanophase Materials Sciences, Oak Ridge National Lab, Oak Ridge, Tennessee, USA
| | - M.R. Fitzsimmons
- Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, Tennessee, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee, USA
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Wlodek M, Slastanova A, Fox LJ, Taylor N, Bikondoa O, Szuwarzynski M, Kolasinska-Sojka M, Warszynski P, Briscoe WH. Structural evolution of supported lipid bilayers intercalated with quantum dots. J Colloid Interface Sci 2020; 562:409-417. [PMID: 31806357 DOI: 10.1016/j.jcis.2019.11.102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/23/2019] [Accepted: 11/25/2019] [Indexed: 10/25/2022]
Abstract
HYPOTHESIS Supported lipid bilayers (SLBs) embedded with hydrophobic quantum dots (QDs) undergo temporal structural rearrangement. EXPERIMENTS Synchrotron X-ray reflectivity (XRR) was applied to monitor the temporal structural changes over a period of 24 h of mixed SLBs of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) / 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-ethanolamine (POPE) intercalated with 4.9 nm hydrophobic cadmium sulphide quantum dots (CdS QDs). The QD-embedded SLBs (QD-SLBs) were formed via rupture of the mixed liposomes on a positively charged polyethylene imine (PEI) monolayer. Atomic force microscopy (AFM) imaging provided complementary characterization of the bilayer morphology. FINDINGS Our results show time-dependent perturbations in the SLB structure due to the interaction upon QD incorporation. Compared to the SLB without QDs, at 3 h incubation time, there was a measurable decrease in the bilayer thickness and a concurrent increase in the scattering length density (SLD) of the QD-SLB. The QD-SLB then became progressively thicker with increasing incubation time, which - along with the fitted SLD profile - was attributed to the structural rearrangement due to the QDs being expelled from the inner leaflet to the outer leaflet of the bilayer. Our results give unprecedented mechanistic insights into the structural evolution of QD-SLBs on a polymer cushion, important to their potential biomedical and biosensing applications.
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Affiliation(s)
- Magdalena Wlodek
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland.
| | - Anna Slastanova
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Laura J Fox
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Nicholas Taylor
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Oier Bikondoa
- XMaS, The UK-CRG Beamline, The European Synchrotron (ESRF), 71 Avenue des Martyrs, 38043 Grenoble, France; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
| | - Michal Szuwarzynski
- AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, al. A. Mickiewicza 30, PL-30059 Krakow, Poland
| | - Marta Kolasinska-Sojka
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
| | - Piotr Warszynski
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
| | - Wuge H Briscoe
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom.
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Noh SH, Kim EH, Han GD, Kim JW, Ito Y, Lee JG, Son TI. Development of phosphonated alginate derivatives as coating material on titanium surface for medical application. Macromol Res 2018. [DOI: 10.1007/s13233-017-5165-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Evaluating the osseointegration of nanostructured titanium implants in animal models: Current experimental methods and perspectives (Review). Biointerphases 2016; 11:030801. [PMID: 27421518 DOI: 10.1116/1.4958793] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of this paper is to review the experimental methods currently being used to evaluate the osseointegration of nanostructured titanium implants using animal models. The material modifications are linked to the biocompatibility of various types of oral implants, such as laser-treated, acid-etched, plasma-coated, and sand-blasted surface modifications. The types of implants are reviewed according to their implantation site (endoosseous, subperiosteal, and transosseous implants). The animal species and target bones used in experimental implantology are carefully compared in terms of the ratio of compact to spongy bone. The surgical technique in animal experiments is briefly described, and all phases of the histological evaluation of osseointegration are described in detail, including harvesting tissue samples, processing undemineralized ground sections, and qualitative and quantitative histological assessment of the bone-implant interface. The results of histological staining methods used in implantology are illustrated and compared. A standardized and reproducible technique for stereological quantification of bone-implant contact is proposed and demonstrated. In conclusion, histological evaluation of the experimental osseointegration of dental implants requires careful selection of the experimental animals, bones, and implantation sites. It is also advisable to use larger animal models and older animals with a slower growth rate rather than small or growing experimental animals. Bones with a similar ratio of compact to spongy bone, such as the human maxilla and mandible, are preferred. A number of practical recommendations for the experimental procedures, harvesting of samples, tissue processing, and quantitative histological evaluations are provided.
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Comparison of the Influence of Phospholipid-Coated Porous Ti-6Al-4V Material on the Osteosarcoma Cell Line Saos-2 and Primary Human Bone Derived Cells. METALS 2016. [DOI: 10.3390/met6030066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Neutron study of phospholipids 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-ethanolamine spray coating on titanium implants. Biointerphases 2016; 11:011002. [DOI: 10.1116/1.4938556] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Enhancement effect of cell adhesion on titanium surface using phosphonated low-molecular-weight chitosan derivative. Macromol Res 2015. [DOI: 10.1007/s13233-015-3135-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Zhou X, Park SH, Mao H, Isoshima T, Wang Y, Ito Y. Nanolayer formation on titanium by phosphonated gelatin for cell adhesion and growth enhancement. Int J Nanomedicine 2015; 10:5597-607. [PMID: 26366080 PMCID: PMC4562736 DOI: 10.2147/ijn.s82166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Phosphonated gelatin was prepared for surface modification of titanium to stimulate cell functions. The modified gelatin was synthesized by coupling with 3-aminopropylphosphonic acid using water-soluble carbodiimide and characterized by (31)P nuclear magnetic resonance and gel permeation chromatography. Circular dichroism revealed no differences in the conformations of unmodified and phosphonated gelatin. However, the gelation temperature was changed by the modification. Even a high concentration of modified gelatin did not form a gel at room temperature. Time-of-flight secondary ion mass spectrometry showed direct bonding between the phosphonated gelatin and the titanium surface after binding. The binding behavior of phosphonated gelatin on the titanium surface was quantitatively analyzed by a quartz crystal microbalance. Ellipsometry showed the formation of a several nanometer layer of gelatin on the surface. Contact angle measurement indicated that the modified titanium surface was hydrophobic. Enhancement of the attachment and spreading of MC-3T3L1 osteoblastic cells was observed on the phosphonated gelatin-modified titanium. These effects on cell adhesion also led to growth enhancement. Phosphonation of gelatin was effective for preparation of a cell-stimulating titanium surface.
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Affiliation(s)
- Xiaoyue Zhou
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
- Department of Regenerative Medicine, School of Pharmaceutical Sciences, Jilin University, Changchun, Jilin, People’s Republic of China
| | - Shin-Hye Park
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
| | - Hongli Mao
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan
| | - Takashi Isoshima
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
| | - Yi Wang
- Department of Regenerative Medicine, School of Pharmaceutical Sciences, Jilin University, Changchun, Jilin, People’s Republic of China
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory, RIKEN, Wako, Saitama, Japan
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan
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Kreuzer M, Simão C, Diaz A, Sotomayor Torres CM. Formation of Titanium Nanostructures on Block Copolymer Templates with Varying Molecular Weights. Macromolecules 2014. [DOI: 10.1021/ma501605s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Martin Kreuzer
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), Edifici ICN2, Campus UAB, 08193 Bellaterra, Spain
| | - Claudia Simão
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), Edifici ICN2, Campus UAB, 08193 Bellaterra, Spain
| | - Ana Diaz
- Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Clivia M. Sotomayor Torres
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), Edifici ICN2, Campus UAB, 08193 Bellaterra, Spain
- Catalan Institute of Research and Advanced Studies (ICREA), 08010 Barcelona, Spain
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Luthringer BJC, Katha UMR, Willumeit R. Phosphatidylethanolamine biomimetic coating increases mesenchymal stem cell osteoblastogenesis. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:2561-2571. [PMID: 24980874 DOI: 10.1007/s10856-014-5263-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 06/19/2014] [Indexed: 06/03/2023]
Abstract
Previous observations (e.g., decreased bacterial adhesion) have shed the light on the auspicious possibility to use phosphatidylethanolamine as biomimetic coating for metal implants. Additionally, it was experimentally shown that phosphatidylethanolamine induces bone formation, however, up to now no study was performed to understand this observation or to find an explanation. In an attempt to unveil how and why phosphatidylethanolamine can improve cell metabolism and osteogenic differentiation, primary cells (human umbilical cord perivascular cells) were cultured on native or phosphatidylethanolamine coated surfaces. Several parameters were followed on gene (real time polymerase chain reaction) and protein (e.g., dot-blot and ELISA tests) levels. It was determined that phosphatidylethanolamine potentiates cell metabolism, osteogenic differentiation, and mineralisation early processes. By preventing biofilm formation while promoting new bone formation, phosphatidylethanolamine could be easily implemented as implant bio-mimicking coating.
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Affiliation(s)
- Bérengère J C Luthringer
- Institute of Materials Research, Department for Structural Research on Macromolecules, Helmholtz-Zentrum Geesthacht (HZG), Geesthacht, Germany,
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Tada S, Timucin E, Kitajima T, Sezerman OU, Ito Y. Direct in vitro selection of titanium-binding epidermal growth factor. Biomaterials 2014; 35:3497-503. [DOI: 10.1016/j.biomaterials.2014.01.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Accepted: 01/07/2014] [Indexed: 02/01/2023]
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Park SH, Zhu L, Tada S, Obuse S, Yoshida Y, Nakamura M, Son TI, Tsuneda S, Ito Y. Phosphorylated gelatin to enhance cell adhesion to titanium. POLYM INT 2013. [DOI: 10.1002/pi.4647] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shin-Hye Park
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Life Science and Medical Bio-Science, Waseda University; 2-2 Wakamatsu-cho; Shinjuku-ku Tokyo 162-8480 Japan
| | - Liping Zhu
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Seiichi Tada
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Sei Obuse
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Yasuhiro Yoshida
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Biomaterials, Okayama University Graduate School of Medicine; Dentistry and Pharmaceutical Sciences; 2-5-1 Shikata-Cho Kikta-Ku, Okayama 700-8558 Japan
| | - Mariko Nakamura
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Dental Hygiene Program; Kibi International College; 8 Iga-cho, Takahashi Okayama 716-8508 Japan
| | - Tae Il Son
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Bioscience and Biotechnology; Chung-Ang University; 40-1 San, Nae-Ri, Daeduck-myun Ansung-si Kyungki-do 456-756 Korea
| | - Satoshi Tsuneda
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Department of Life Science and Medical Bio-Science, Waseda University; 2-2 Wakamatsu-cho; Shinjuku-ku Tokyo 162-8480 Japan
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
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