101
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities-April 2020. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4565-4566. [PMID: 32323550 DOI: 10.1021/acs.langmuir.0c01135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
|
102
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. Biochemistry 2020; 59:1641-1642. [DOI: 10.1021/acs.biochem.0c00318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
103
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. Anal Chem 2020; 92:6187-6188. [DOI: 10.1021/acs.analchem.0c01669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
104
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. Mol Pharm 2020; 17:1445-1446. [DOI: 10.1021/acs.molpharmaceut.0c00420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
105
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. Inorg Chem 2020; 59:5796-5797. [DOI: 10.1021/acs.inorgchem.0c01141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
106
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. Org Lett 2020; 22:3307-3308. [DOI: 10.1021/acs.orglett.0c01355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
107
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. J Org Chem 2020; 85:5751-5752. [DOI: 10.1021/acs.joc.0c00960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
108
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. J Proteome Res 2020; 19:1883-1884. [DOI: 10.1021/acs.jproteome.0c00263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
109
|
Burrows CJ, Wang S, Kim HJ, Meyer GJ, Schanze K, Lee TR, Lutkenhaus JL, Kaplan D, Jones C, Bertozzi C, Kiessling L, Mulcahy MB, Lindsley CW, Finn MG, Blum JD, Kamat P, Aldrich CC, Rowan S, Bin Liu, Liotta D, Weiss PS, Zhang D, Ganesh KN, Sexton P, Atwater HA, Gooding JJ, Allen DT, Voigt CA, Sweedler J, Schepartz A, Rotello V, Lecommandoux S, Sturla SJ, Hammes-Schiffer S, Buriak J, Steed JW, Wu H, Zimmerman J, Brooks B, Savage P, Tolman W, Hofmann TF, Brennecke JF, Holme TA, Merz KM, Scuseria G, Jorgensen W, Georg GI, Wang S, Proteau P, Yates JR, Stang P, Walker GC, Hillmyer M, Taylor LS, Odom TW, Carreira E, Rossen K, Chirik P, Miller SJ, McCoy A, Shea JE, Zanni M, Murphy C, Scholes G, Loo JA. Update to Our Reader, Reviewer, and Author Communities—April 2020. ACS Macro Lett 2020. [DOI: 10.1021/acsmacrolett.0c00310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
110
|
Young C, Hammack A, Lee HJ, Jia H, Yu T, Marquez MD, Jamison AC, Gnade BE, Lee TR. Poly(1,4-phenylene vinylene) Derivatives with Ether Substituents to Improve Polymer Solubility for Use in Organic Light-Emitting Diode Devices. ACS OMEGA 2019; 4:22332-22344. [PMID: 31909316 PMCID: PMC6941186 DOI: 10.1021/acsomega.9b02396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 11/15/2019] [Indexed: 06/10/2023]
Abstract
New ether-substituted poly(1,4-phenylene vinylene) (PPV) derivatives were synthesized via Horner-Emmons coupling. The structures of the monomers and the resultant oligomers were confirmed by 1H and 13C NMR spectroscopies. The molecular weights of the oligomers were characterized by gel permeation chromatography, giving the number-average and weight-average molecular weights and the corresponding polydispersity indices. Measurements of UV-vis absorption and fluorescence were used to characterize the optical properties of the oligomers. Estimation of the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels and other electrochemical characteristics of the oligomers were investigated by cyclic voltammetry. Dialkyl and dialkoxy PPV oligomers were also prepared and characterized following the same instrumental methods used for the ether-substituted oligomers, providing a known reference system to judge the performance of the new conjugated oligomers. Devices were fabricated to analyze the electroluminescent characteristics of the oligomers in organic light-emitting diodes.
Collapse
|
111
|
Kim BS, Chen YT, Srinoi P, Marquez MD, Lee TR. Hydrogel-Encapsulated Mesoporous Silica-Coated Gold Nanoshells for Smart Drug Delivery. Int J Mol Sci 2019; 20:E3422. [PMID: 31336823 PMCID: PMC6678574 DOI: 10.3390/ijms20143422] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/06/2019] [Accepted: 07/10/2019] [Indexed: 11/16/2022] Open
Abstract
A "smart" core@shell composite nanoparticle (NP) having dual-response mechanisms (i.e., temperature and light) was synthesized, and its efficacy in the loading and release of small molecules was explored. These core@shell NPs are composed of an optically active gold nanoshell (GNS) core and a mesoporous (m-) silica layer (m-SiO2). The GNS@m-SiO2 nanoparticles are further encapsulated within a thermo-responsive poly(N-isopropylacrylamide-co-acrylic acid) hydrogel (PNIPAM-co-AA). The multi-responsive composite NPs were designed to create thermally and optically modulated drug-delivery vehicles with a m-SiO2 layer providing additional non-collapsible space for drug storage. The influence of the m-SiO2 layer on the efficacy of loading and release of methylene blue, which serves as a model for a small-molecule therapeutic drug, was evaluated. The "smart" core@shell composite NPs having a m-SiO2 layer demonstrated an improved capacity to load and release small molecules compared to the corresponding NPs with no m-SiO2 shell. Additionally, an efficient response by the composite NPs was successfully induced by the thermal energy generated from the gold nanoshell core upon exposure to near infrared (NIR) stimulation.
Collapse
|
112
|
Kaewtunjai N, Summart R, Wongnoppavich A, Lojanapiwat B, Lee TR, Tuntiwechapikul W. Telomerase Inhibition, Telomere Shortening, and Cellular Uptake of the Perylene Derivatives PM2 and PIPER in Prostate Cancer Cells. Biol Pharm Bull 2019; 42:906-914. [DOI: 10.1248/bpb.b18-00860] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
113
|
Pikalov AA, Ngo D, Lee HJ, Lee TR, Baldelli S. Sum Frequency Generation Imaging Microscopy of Self-Assembled Monolayers on Metal Surfaces: Factor Analysis of Mixed Monolayers. Anal Chem 2019; 91:1269-1276. [PMID: 30605304 DOI: 10.1021/acs.analchem.8b01840] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sum frequency generation (SFG) images of microcontact patterned self-assembled alkanethiol monolayers on metal surfaces were analyzed by factor analysis (FA) to determine the spatial distribution of the patterned monolayers over the images. Additionally, each significant abstract factor produced by FA was assessed to determine the information contained within it. These results indicate that FA of the SFG spectra is a promising method to determine the composition and identities of mixed alkanethiol systems that show different vibrational spectra and image contrast. Factor analysis has successfully been applied to SFG images obtained with low signals, which reduces the time required for full spectral SFG imaging.
Collapse
|
114
|
Bryan WW, Medhi R, Marquez MD, Rittikulsittichai S, Tran M, Lee TR. Porous silver-coated pNIPAM- co-AAc hydrogel nanocapsules. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1973-1982. [PMID: 31667045 PMCID: PMC6808198 DOI: 10.3762/bjnano.10.194] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 09/09/2019] [Indexed: 05/22/2023]
Abstract
This paper describes the preparation and characterization of a new type of core-shell nanoparticle in which the structure consists of a hydrogel core encapsulated within a porous silver shell. The thermo-responsive hydrogel cores were prepared by surfactant-free emulsion polymerization of a selected mixture of N-isopropylacrylamide (NIPAM) and acrylic acid (AAc). The hydrogel cores were then encased within either a porous or complete silver shell for which the localized surface plasmon resonance (LSPR) extends from visible to near-infrared (NIR) wavelengths (i.e., λmax varies from 550 to 1050 nm, depending on the porosity), allowing for reversible contraction and swelling of the hydrogel via photothermal heating of the surrounding silver shell. Given that NIR light can pass through tissue, and the silver shell is porous, this system can serve as a platform for the smart delivery of payloads stored within the hydrogel core. The morphology and composition of the composite nanoparticles were characterized by SEM, TEM, and FTIR, respectively. UV-vis spectroscopy was used to characterize the optical properties.
Collapse
|
115
|
Kaewtunjai N, Wongpoomchai R, Imsumran A, Pompimon W, Athipornchai A, Suksamrarn A, Lee TR, Tuntiwechapikul W. Ginger Extract Promotes Telomere Shortening and Cellular Senescence in A549 Lung Cancer Cells. ACS OMEGA 2018; 3:18572-18581. [PMID: 32010796 PMCID: PMC6988994 DOI: 10.1021/acsomega.8b02853] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 12/10/2018] [Indexed: 05/07/2023]
Abstract
Replicative senescence, which is caused by telomere shortening from the end replication problem, is considered one of the tumor-suppressor mechanisms in eukaryotes. However, most cancers escape this replicative senescence by reactivating telomerase, an enzyme that extends the 3'-ends of the telomeres. Previously, we reported the telomerase inhibitory effect of a crude Zingiber officinale extract (ZOE), which suppressed hTERT expression, leading to a reduction in hTERT protein and telomerase activity in A549 lung cancer cells. In the present study, we found that ZOE-induced telomere shortening and cellular senescence during the period of 60 days when these A549 cells were treated with subcytotoxic doses of ZOE. Using assay-guided fractionation and gas chromatography/mass spectrometry analysis, we found that the major compounds in the active subfractions were paradols and shogaols of various chain lengths. The results from studies of pure 6-paradol and 6-shogaol confirmed that these two compounds could suppress hTERT expression as well as telomerase activity in A549 cells. These results suggest that these paradols and shogaols are likely the active compounds in ZOE that suppress hTERT expression and telomerase activity in these cells. Furthermore, ZOE was found to be nontoxic and had an anticlastogenic effect against diethylnitrosamine-induced liver micronucleus formation in rats. These findings suggest that ginger extract can potentially be useful in dietary cancer prevention.
Collapse
|
116
|
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
|
117
|
Kulkarni SA, Kolhatkar AG, Lee TR, Garno JC. Vibrational response of clusters of Fe 3O 4 nanoparticles patterned on glass surfaces investigated with magnetic sample modulation AFM. NANOSCALE 2018; 10:20426-20434. [PMID: 30378633 DOI: 10.1039/c8nr06174b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The vibration of Fe3O4 nanoparticles in response to an alternating magnetic field can be sensitively detected using contact mode atomic force microscopy (AFM) combined with selective modulation of magnetic domains. While imaging patterned samples of magnetic nanoparticles with contact mode AFM, a magnetic field was applied to drive sample vibration. The field altered in polarity and strength according to parameters of an AC current applied to a solenoid located under the sample. The vibration of Fe3O4 nanoparticles was detected by a nonmagnetic AFM tip to map the changes in frequency and amplitude of the vibrating sample at the level of individual Fe3O4 nanoparticles and clusters. Colloidal lithography, was used to prepare patterns of Fe3O4 nanoparticles on a glass surface using the basic steps of mixing, drying and removing the surface template of latex spheres. Monodisperse latex spheres were used to guide the deposition of magnetic nanoparticles in the spaces between the close-packed spheres of the latex film. With a mixture approach of "two-particle" lithography, 2D arrays of patterned aggregates of metal nanoparticles were generated which formed a periodic, well-defined arrangement that was suitable for subsequent characterizations with magnetic sample modulation (MSM).
Collapse
|
118
|
Chinwangso P, St Hill LR, Marquez MD, Lee TR. Unsymmetrical Spiroalkanedithiols Having Mixed Fluorinated and Alkyl Tailgroups of Varying Length: Film Structure and Interfacial Properties. Molecules 2018; 23:E2632. [PMID: 30322175 PMCID: PMC6222720 DOI: 10.3390/molecules23102632] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 09/19/2018] [Accepted: 09/25/2018] [Indexed: 02/01/2023] Open
Abstract
A custom-designed series of unsymmetrical spiroalkanedithiols having tailgroups comprised of a terminally fluorinated chain and a hydrocarbon chain of varying lengths were synthesized and used to prepare self-assembled monolayers (SAMs) on gold substrates. The specific structure of the adsorbates was of the form [CH₃(CH₂)n][CF₃(CF₂)₇(CH₂)₈]C[CH₂SH]₂, where n = 7, 9, and 15 (designated as F8H10-C10, F8H10-C12, and F8H10-C18, respectively). The influence of the length of the hydrocarbon chain in the bidentate dithiol on the structure and interfacial properties of the monolayer was explored. A structurally analogous partially fluorinated monodentate alkanethiol and the corresponding normal alkanethiols were used to generate appropriate SAMs as reference systems. Measurements of ellipsometric thickness showed an unexpectedly low film thickness for the SAMs derived from the bidentate adsorbates, possibly due to disruptions in interchain packing caused by the fluorocarbon chains (i.e., phase-incompatible fluorocarbon-hydrocarbon interactions), ultimately giving rise to loosely packed and disordered films. Analysis by X-ray photoelectron spectroscopy (XPS) were also consistent with a model in which the films were loosely packed; additionally, the XPS spectra confirmed the attachment of the sulfur headgroups of the bidentate adsorbates onto the gold substrates. Studies of the SAMs by polarization modulation-infrared reflection-adsorption spectroscopy (PM-IRRAS) suggested that as the length of the hydrocarbon chain in the adsorbates was extended, a more ordered surface was achieved by reducing the tilt of the fluorocarbon segment. The wettability data indicated that the adsorbates with longer alkyl chains were less wettable than those with shorter alkyl chains, likely due to an increase in interchain van der Waals forces in the former.
Collapse
|
119
|
Rittikulsittichai S, Park CS, Marquez MD, Jamison AC, Frank T, Wu CH, Wu JI, Lee TR. Inhibiting Reductive Elimination as an Intramolecular Disulfide Dramatically Enhances the Thermal Stability of SAMs on Gold Derived from Bidentate Adsorbents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6645-6652. [PMID: 29739193 DOI: 10.1021/acs.langmuir.7b03973] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The bidentate aromatic adsorbate, 5-(octadecyloxy)-1,3-benzenedimethanethiol (R1ArmDT), with a specific design of extended S-S distance and a geometric constraint to resist cyclic disulfide formation was synthesized. The film formation and thermal stability of self-assembled monolayers (SAMs) derived from R1ArmDT were investigated and compared to those of SAMs derived from an analogous bidentate dithiol 2-(4-(octadecyloxy)-phenyl)propane-1,3-dithiol (R1ArDT), in which the two sulfur atoms can readily form a cyclic disulfide upon reductive elimination from the surface. Although the SAMs derived from R1ArmDT were less densely packed than those derived from R1ArDT, as judged by the data obtained by X-ray photoelectron spectroscopy and polarization modulation infrared reflection absorption spectroscopy, the SAMs derived from R1ArmDT were markedly more thermally stable than those derived from R1ArDT. The greater thermal stability of the R1ArmDT SAMs can be rationalized on the basis of the structure of the bidentate R1ArmDT headgroup, in which the two pendant sulfur atoms cannot access each other intramolecularly to form a cyclic disulfide upon reductive elimination from the surface.
Collapse
|
120
|
Chen YT, Medhi R, Nekrashevich I, Litvinov D, Xu S, Lee TR. Specific Detection of Proteins Using Exceptionally Responsive Magnetic Particles. Anal Chem 2018; 90:6749-6756. [DOI: 10.1021/acs.analchem.8b00593] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
121
|
Park HH, Srisombat LO, Jamison AC, Liu T, Marquez MD, Park H, Lee S, Lee TC, Lee TR. Temperature-Responsive Hydrogel-Coated Gold Nanoshells. Gels 2018; 4:E28. [PMID: 30674804 PMCID: PMC6209258 DOI: 10.3390/gels4020028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 03/16/2018] [Accepted: 03/16/2018] [Indexed: 11/22/2022] Open
Abstract
Gold nanoshells (~160 nm in diameter) were encapsulated within a shell of temperature-responsive poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAM-co-AA)) using a surface-bound rationally-designed free radical initiator in water for the development of a photothermally-induced drug-delivery system. The morphologies of the resultant hydrogel-coated nanoshells were analyzed by scanning electron microscopy (SEM), while the temperature-responsive behavior of the nanoparticles was characterized by dynamic light scattering (DLS). The diameter of the P(NIPAM-co-AA) encapsulated nanoshells decreased as the solution temperature was increased, indicating a collapse of the hydrogel layer with increasing temperatures. In addition, the optical properties of the composite nanoshells were studied by UV-visible spectroscopy. The surface plasmon resonance (SPR) peak of the hydrogel-coated nanoshells appeared at ~800 nm, which lies within the tissue-transparent range that is important for biomedical applications. Furthermore, the periphery of the particles was conjugated with the model protein avidin to modify the hydrogel-coated nanoshells with a fluorescent-tagged biotin, biotin-4-fluorescein (biotin-4-FITC), for colorimetric imaging/monitoring.
Collapse
|
122
|
Khantamat O, Li CH, Liu SP, Liu T, Lee HJ, Zenasni O, Lee TC, Cai C, Lee TR. Broadening the photoresponsive activity of anatase titanium dioxide particles via decoration with partial gold shells. J Colloid Interface Sci 2018; 513:715-725. [DOI: 10.1016/j.jcis.2017.10.053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/13/2017] [Accepted: 10/13/2017] [Indexed: 12/20/2022]
|
123
|
Kolhatkar A, Chen YT, Chinwangso P, Nekrashevich I, Dannangoda GC, Singh A, Jamison AC, Zenasni O, Rusakova IA, Martirosyan KS, Litvinov D, Xu S, Willson RC, Lee TR. Magnetic Sensing Potential of Fe 3O 4 Nanocubes Exceeds That of Fe 3O 4 Nanospheres. ACS OMEGA 2017; 2:8010-8019. [PMID: 29214234 PMCID: PMC5709776 DOI: 10.1021/acsomega.7b01312] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 10/19/2017] [Indexed: 05/11/2023]
Abstract
This paper highlights the relation between the shape of iron oxide (Fe3O4) particles and their magnetic sensing ability. We synthesized Fe3O4 nanocubes and nanospheres having tunable sizes via solvothermal and thermal decomposition synthesis reactions, respectively, to obtain samples in which the volumes and body diagonals/diameters were equivalent. Vibrating sample magnetometry (VSM) data showed that the saturation magnetization (Ms) and coercivity of 100-225 nm cubic magnetic nanoparticles (MNPs) were, respectively, 1.4-3.0 and 1.1-8.4 times those of spherical MNPs on a same-volume and same-body diagonal/diameter basis. The Curie temperature for the cubic Fe3O4 MNPs for each size was also higher than that of the corresponding spherical MNPs; furthermore, the cubic Fe3O4 MNPs were more crystalline than the corresponding spherical MNPs. For applications relying on both higher contact area and enhanced magnetic properties, higher-Ms Fe3O4 nanocubes offer distinct advantages over Fe3O4 nanospheres of the same-volume or same-body diagonal/diameter. We evaluated the sensing potential of our synthesized MNPs using giant magnetoresistive (GMR) sensing and force-induced remnant magnetization spectroscopy (FIRMS). Preliminary data obtained by GMR sensing confirmed that the nanocubes exhibited a distinct sensitivity advantage over the nanospheres. Similarly, FIRMS data showed that when subjected to the same force at the same initial concentration, a greater number of nanocubes remained bound to the sensor surface because of higher surface contact area. Because greater binding and higher Ms translate to stronger signal and better analytical sensitivity, nanocubes are an attractive alternative to nanospheres in sensing applications.
Collapse
|
124
|
Chen YT, Kolhatkar AG, Zenasni O, Xu S, Lee TR. Biosensing Using Magnetic Particle Detection Techniques. SENSORS (BASEL, SWITZERLAND) 2017; 17:E2300. [PMID: 28994727 PMCID: PMC5676660 DOI: 10.3390/s17102300] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Revised: 08/26/2017] [Accepted: 08/30/2017] [Indexed: 02/03/2023]
Abstract
Magnetic particles are widely used as signal labels in a variety of biological sensing applications, such as molecular detection and related strategies that rely on ligand-receptor binding. In this review, we explore the fundamental concepts involved in designing magnetic particles for biosensing applications and the techniques used to detect them. First, we briefly describe the magnetic properties that are important for bio-sensing applications and highlight the associated key parameters (such as the starting materials, size, functionalization methods, and bio-conjugation strategies). Subsequently, we focus on magnetic sensing applications that utilize several types of magnetic detection techniques: spintronic sensors, nuclear magnetic resonance (NMR) sensors, superconducting quantum interference devices (SQUIDs), sensors based on the atomic magnetometer (AM), and others. From the studies reported, we note that the size of the MPs is one of the most important factors in choosing a sensing technique.
Collapse
|
125
|
Marquez MD, Zenasni O, Jamison AC, Lee TR. Homogeneously Mixed Monolayers: Emergence of Compositionally Conflicted Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8839-8855. [PMID: 28562051 DOI: 10.1021/acs.langmuir.7b00755] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The ability to manipulate interfaces at the nanoscale via a variety of thin-film technologies offers a plethora of avenues for advancing surface applications. These include surfaces with remarkable antibiofouling properties as well as those with tunable physical and electronic properties. Molecular self-assembly is one notably attractive method used to decorate and modify surfaces. Of particular interest to surface scientists has been the thiolate-gold system, which serves as a reliable method for generating model thin-film monolayers that transform the interfacial properties of gold surfaces. Despite widespread interest, efforts to tune the interfacial properties using mixed adsorbate systems have frequently led to phase-separated domains of molecules on the surface with random sizes and shapes depending on the structure and chemical composition of the adsorbates. This feature article highlights newly emerging methods for generating mixed thin-film interfaces, not only to enhance the aforementioned properties of organic thin films, but also to give rise to interfacial compositions never before observed in nature. An example would be the development of monolayers formed from bidentate adsorbates and other unique headgroup architectures that provide the surface bonding stability necessary to allow the assembly of interfaces that expose mixtures of chains that are fundamentally different in character (i.e., either phase-incompatible or structurally dissimilar), producing compositionally "conflicted" interfaces. By also exploring the prior efforts to produce such homogeneously blended interfaces, this feature article seeks to convey the relationships between the methods of film formation and the overall properties of the resulting interfaces.
Collapse
|