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Magnetic nanoparticles with functional silanes: evolution of well-defined shells from anhydride containing silane. 具有功能硅烷的磁性纳米颗粒:从含有硅烷的酸酐演变成定义良好的壳。
Journal of Materials Chemistry Pub Date : 2009-01-01 DOI: 10.1039/b821917f
Xinlei Huang, Abrin Schmucker, Jason Dyke, Sara M Hall, John Retrum, Barry Stein, Nicholas Remmes, David V Baxter, Bogdan Dragnea, Lyudmila M Bronstein
{"title":"Magnetic nanoparticles with functional silanes: evolution of well-defined shells from anhydride containing silane.","authors":"Xinlei Huang,&nbsp;Abrin Schmucker,&nbsp;Jason Dyke,&nbsp;Sara M Hall,&nbsp;John Retrum,&nbsp;Barry Stein,&nbsp;Nicholas Remmes,&nbsp;David V Baxter,&nbsp;Bogdan Dragnea,&nbsp;Lyudmila M Bronstein","doi":"10.1039/b821917f","DOIUrl":"10.1039/b821917f","url":null,"abstract":"<p><p>Modification of iron oxide nanoparticles (NPs) synthesized by high temperature solvothermal routes is carried out using two silanes: (i) N-(6-aminohexyl)-aminopropyltrimethoxysilane (AHAPS) where only one end of the molecule reacts with the surface Fe-OH groups and (ii) 3-(triethoxysilyl)propylsuccinic anhydride (SSA) where both ends are reactive with Fe-OH. Depending on the NP synthesis protocol, the amount of surface OH groups on the NPs may differ, however, for all the cases presented here, the comparatively low OH group density prevents a high density of AHAPS coverage, yielding NP aggregates instead of single particles in aqueous solutions. Alternatively, use of SSA containing two terminal functionalities, anhydride and siloxy, which are both reactive towards the NP surface, results in the formation of discrete dense polymeric shells, providing stability of individual NPs in water. The mechanism of the SSA shell formation is discussed. The evolution of the chemical transformations leads to shells of different thickness and density, yet this evolution can be halted by hydrolysis, after which the NPs are water soluble, negatively charged and exhibit excellent stability in aqueous media.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"19 24","pages":"4231-4239"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1039/b821917f","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28408467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 53
Molecular packing and magnetic properties of lithium naphthalocyanine crystals: hollow channels enabling permeability and paramagnetic sensitivity to molecular oxygen. 萘酞菁锂晶体的分子填料和磁性能:空心通道对分子氧的渗透性和顺磁敏感性。
Journal of Materials Chemistry Pub Date : 2009-01-01 DOI: 10.1039/b901886g
Ramasamy P Pandian, Michelle Dolgos, Camelia Marginean, Patrick M Woodward, P Chris Hammel, Periakaruppan T Manoharan, Periannan Kuppusamy
{"title":"Molecular packing and magnetic properties of lithium naphthalocyanine crystals: hollow channels enabling permeability and paramagnetic sensitivity to molecular oxygen.","authors":"Ramasamy P Pandian, Michelle Dolgos, Camelia Marginean, Patrick M Woodward, P Chris Hammel, Periakaruppan T Manoharan, Periannan Kuppusamy","doi":"10.1039/b901886g","DOIUrl":"10.1039/b901886g","url":null,"abstract":"<p><p>The synthesis, structural framework, magnetic and oxygen-sensing properties of a lithium naphthalocyanine (LiNc) radical probe are presented. LiNc was synthesized in the form of a microcrystalline powder using a chemical method and characterized by electron paramagnetic resonance (EPR) spectroscopy, magnetic susceptibility, powder X-ray diffraction analysis, and mass spectrometry. X-Ray powder diffraction studies revealed a structural framework that possesses long, hollow channels running parallel to the packing direction. The channels measured approximately 5.0 × 5.4 Å(2) in the two-dimensional plane perpendicular to the length of the channel, enabling diffusion of oxygen molecules (2.9 × 3.9 Å(2)) through the channel. The powdered LiNc exhibited a single, sharp EPR line under anoxic conditions, with a peak-to-peak linewidth of 630 mG at room temperature. The linewidth was sensitive to surrounding molecular oxygen, showing a linear increase in pO(2) with an oxygen sensitivity of 31.2 mG per mmHg. The LiNc microcrystals can be further prepared as nano-sized crystals without the loss of its high oxygen-sensing properties. The thermal variation of the magnetic properties of LiNc, such as the EPR linewidth, EPR intensity and magnetic susceptibility revealed the existence of two different temperature regimes of magnetic coupling and hence differing columnar packing, both being one-dimensional antiferromagnetic chains but with differing magnitudes of exchange coupling constants. At a temperature of ∼50 K, LiNc crystals undergo a reversible phase transition. The high degree of oxygen-sensitivity of micro- and nano-sized crystals of LiNc, combined with excellent stability, should enable precise and accurate measurements of oxygen concentration in biological systems using EPR spectroscopy.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"19 24","pages":"4138-4147"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2756769/pdf/nihms-132942.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28043267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Imaging gold nanorods in excised human breast carcinoma by spectroscopic optical coherence tomography. 利用光谱光学相干断层成像技术对切除的人乳腺癌中的金纳米棒进行成像。
Journal of Materials Chemistry Pub Date : 2009-01-01 DOI: 10.1039/b823389f
Amy L Oldenburg, Matthew N Hansen, Tyler S Ralston, Alexander Wei, Stephen A Boppart
{"title":"Imaging gold nanorods in excised human breast carcinoma by spectroscopic optical coherence tomography.","authors":"Amy L Oldenburg,&nbsp;Matthew N Hansen,&nbsp;Tyler S Ralston,&nbsp;Alexander Wei,&nbsp;Stephen A Boppart","doi":"10.1039/b823389f","DOIUrl":"10.1039/b823389f","url":null,"abstract":"<p><p>Plasmon-resonant gold nanorods (GNRs) can serve as imaging agents for spectroscopic optical coherence tomography (SOCT). The aspect ratio of the GNRs are adjusted for maximum absorption in the far red to create a partial spectral overlap with the low-wavelength edge of the near-infrared SOCT imaging band. The spectroscopic absorption profile of the GNRs is incorporated into a depth-resolved algorithm for mapping the relative GNR density within OCT images. This technique enables us to image GNR distributions in excised human breast carcinomas, demonstrating their potential as OCT contrast agents in heteregeneous, highly scattering tissues.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"19 ","pages":"6407"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1039/b823389f","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28674368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 93
Conjugating Methotrexate to magnetite (Fe(3)O(4)) nanoparticles via trichloro-s-triazine. 三氯-s-三嗪偶联甲氨蝶呤与磁铁矿(Fe(3)O(4))纳米颗粒。
Journal of Materials Chemistry Pub Date : 2009-01-01 DOI: 10.1039/b902373a
Kaylie L Young, Chenjie Xu, Jin Xie, Shouheng Sun
{"title":"Conjugating Methotrexate to magnetite (Fe(3)O(4)) nanoparticles via trichloro-s-triazine.","authors":"Kaylie L Young,&nbsp;Chenjie Xu,&nbsp;Jin Xie,&nbsp;Shouheng Sun","doi":"10.1039/b902373a","DOIUrl":"https://doi.org/10.1039/b902373a","url":null,"abstract":"<p><p>Monodisperse Fe(3)O(4) nanoparticles (NPs) originally synthesized with a hydrophobic oleylamine capping ligand were made water soluble and conjugated to the anticancer drug Methotrexate (MTX) using a new chemistry based on the readily available linker trichloro-s-triazine (TsT). This new linker is much more versatile than those that currently exist for attaching biomolecules to magnetic NPs. The MTX-conjugated NPs were found to be stable under physiological conditions for over 72 hours and MTX was shown to maintain its anticancer activity after conjugation to the NP surface. Through cell viability studies and intracellular uptake studies, MTX-conjugated NPs were shown to have targeting specificity for a tumor cell line (9L rat glioma) over a healthy cell line (Cultured Pulmonary Artery Endothelial). Additionally the MTX-conjugated NPs were visualized inside 9L cells using fluorescence microscopy to help elucidate their path within a cell after internalization.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"19 35","pages":"6400-6406"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1039/b902373a","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28510157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 47
Fine tuning the optical properties of Au-Ag nanocages by selectively etching Ag with oxygen and a water-soluble thiol. 用氧气和水溶性硫醇选择性地蚀刻银,微调金银纳米笼的光学特性。
Journal of Materials Chemistry Pub Date : 2009-01-01 DOI: 10.1039/b901817d
Eun Chul Cho, Claire M Cobley, Matthew Rycenga, Younan Xia
{"title":"Fine tuning the optical properties of Au-Ag nanocages by selectively etching Ag with oxygen and a water-soluble thiol.","authors":"Eun Chul Cho, Claire M Cobley, Matthew Rycenga, Younan Xia","doi":"10.1039/b901817d","DOIUrl":"10.1039/b901817d","url":null,"abstract":"","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"19 ","pages":"6317-6320"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2760974/pdf/nihms137284.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28437516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Self-assembly approaches to nanomaterial encapsulation in viral protein cages. 病毒蛋白笼中纳米材料封装的自组装方法。
Journal of Materials Chemistry Pub Date : 2008-01-01 DOI: 10.1039/b805874c
Stella E Aniagyei, Christopher Dufort, C Cheng Kao, Bogdan Dragnea
{"title":"Self-assembly approaches to nanomaterial encapsulation in viral protein cages.","authors":"Stella E Aniagyei,&nbsp;Christopher Dufort,&nbsp;C Cheng Kao,&nbsp;Bogdan Dragnea","doi":"10.1039/b805874c","DOIUrl":"https://doi.org/10.1039/b805874c","url":null,"abstract":"<p><p>A perspective on abiotic material encapsulation inside virus capsids is provided. The emphasis is on the physical principles of virus assembly relevant to packaging, strategies for encapsulation and capsid modification, and on emerging applications.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"18 32","pages":"3763-3774"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1039/b805874c","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28421101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 107
Self-Assembled Collagen-like Peptide Fibers as Templates for Metallic Nanowires. 作为金属纳米线模板的自组装胶原蛋白样肽纤维。
Journal of Materials Chemistry Pub Date : 2008-01-01 DOI: 10.1039/b807150k
Daniel Gottlieb, Stephen A Morin, Song Jin, Ronald T Raines
{"title":"Self-Assembled Collagen-like Peptide Fibers as Templates for Metallic Nanowires.","authors":"Daniel Gottlieb, Stephen A Morin, Song Jin, Ronald T Raines","doi":"10.1039/b807150k","DOIUrl":"10.1039/b807150k","url":null,"abstract":"<p><p>Inspired by nature's ability to fabricate supramolecular nanostructures from the bottom-up, materials scientist have become increasingly interested in the use of biomolecules like DNA, peptides, or proteins as templates for the creation of novel nanostructures and nanomaterials. Although the advantages of self-assembling biomolecular structures clearly lie in their chemical diversity, spatial control, and numerous geometric architectures, it is challenging to elaborate them into functional hybrid inorganic-bionanomaterials without rendering the biomolecular scaffold damaged or dysfunctional. In this study, attachment of gold nanoparticles to collagen-related self-assembling peptides at L-lysine residues incorportated within the peptides sequence and the N-terminus led to metal nanoparticle-decorated fibers. After electroless silver plating, these fibers were completely metalized, creating electrically conductive nanowires under mild conditions while leaving the peptide fiber core intact. This study demonstrates the bottom-up assembly of synthetic peptidic fibers under mild conditions and their potential as templates for other complex inorganic-organic hybrid nanostructures.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"18 ","pages":"3865"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2815334/pdf/nihms167412.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28694318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance. 单个金属纳米粒子的暗场显微镜研究:了解影响局部表面等离子体共振线宽的因素。
Journal of Materials Chemistry Pub Date : 2008-01-01 DOI: 10.1039/b714759g
Min Hu, Carolina Novo, Alison Funston, Haining Wang, Hristina Staleva, Shengli Zou, Paul Mulvaney, Younan Xia, Gregory V Hartland
{"title":"Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance.","authors":"Min Hu, Carolina Novo, Alison Funston, Haining Wang, Hristina Staleva, Shengli Zou, Paul Mulvaney, Younan Xia, Gregory V Hartland","doi":"10.1039/b714759g","DOIUrl":"10.1039/b714759g","url":null,"abstract":"<p><p>This article provides a review of our recent Rayleigh scattering measurements on single metal nanoparticles. Two different systems will be discussed in detail: gold nanorods with lengths between 30 and 80 nm, and widths between 8 and 30 nm; and hollow gold-silver nanocubes (termed nanoboxes or nanocages depending on their exact morphology) with edge lengths between 100 and 160 nm, and wall thicknesses of the order of 10 nm. The goal of this work is to understand how the linewidth of the localized surface plasmon resonance depends on the size, shape, and environment of the nanoparticles. Specifically, the relative contributions from bulk dephasing, electron-surface scattering, and radiation damping (energy loss via coupling to the radiation field) have been determined by examining particles with different dimensions. This separation is possible because the magnitude of the radiation damping effect is proportional to the particle volume, whereas, the electron-surface scattering contribution is inversely proportional to the dimensions. For the nanorods, radiation damping is the dominant effect for thick rods (widths greater than 20 nm), while electron-surface scattering is dominant for thin rods (widths less than 10 nm). Rods with widths in between these limits have narrow resonances-approaching the value determined by the bulk contribution. For nanoboxes and nanocages, both radiation damping and electron-surface scattering are significant at all sizes. This is because these materials have thin walls, but large edge lengths and, therefore, relatively large volumes. The effect of the environment on the localized surface plasmon resonance has also been studied for nanoboxes. Increasing the dielectric constant of the surroundings causes a red-shift and an increase in the linewidth of the plasmon band. The increase in linewidth is attributed to enhanced radiation damping.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"18 17","pages":"1949-1960"},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2563424/pdf/nihms54256.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27720856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Encapsulation and Functionalization of Nanoparticles in Crosslinked Resorcinarene Shells. 间苯二甲酸交联壳纳米颗粒的包封与功能化。
Journal of Materials Chemistry Pub Date : 2007-01-01 DOI: 10.1039/b614295h
Ramjee Balasubramanian, Young-Gil Kwon, Alexander Wei
{"title":"Encapsulation and Functionalization of Nanoparticles in Crosslinked Resorcinarene Shells.","authors":"Ramjee Balasubramanian,&nbsp;Young-Gil Kwon,&nbsp;Alexander Wei","doi":"10.1039/b614295h","DOIUrl":"https://doi.org/10.1039/b614295h","url":null,"abstract":"<p><p>Two resorcinarene-derived tetrathiols with terminal alkene sidechains (tetraarylthiol cavitand 3 and tetrabenzylthiol cavitand 4) were determined to be efficient at extracting colloidal gold nanoparticles from aqueous solutions and stabilizing their dispersion in organic solvents. Treatment of these nanoparticle dispersions with the Grubbs olefin metathesis catalyst resulted in crosslinked resorcinarene shells that were highly resistant to alkanethiol-induced desorption at high temperatures. Nanoparticles in crosslinked shells of tetrabenzylthiol cavitand 4 were particularly robust, and could be precipitated and redispersed many times with minimal attrition. These shells could also withstand oxidative conditions and were amenable to synthetic modifications involving epoxidation and dihydroxylation.</p>","PeriodicalId":16297,"journal":{"name":"Journal of Materials Chemistry","volume":"17 1","pages":"105-112"},"PeriodicalIF":0.0,"publicationDate":"2007-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1039/b614295h","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28091527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 24
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