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Rehman T, Khirallah J, Demirel E, Howell J, Vlaisavljevich E, Yuksel Durmaz Y. Development of Acoustically Active Nanocones Using the Host-Guest Interaction as a New Histotripsy Agent. ACS OMEGA 2019; 4:4176-4184. [PMID: 31459627 PMCID: PMC6649115 DOI: 10.1021/acsomega.8b02922] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 02/14/2019] [Indexed: 05/04/2023]
Abstract
Histotripsy is a noninvasive and nonthermal ultrasound ablation technique, which mechanically ablates the tissues using very short, focused, high-pressured ultrasound pulses to generate dense cavitating bubble cloud. Histotripsy requires large negative pressures (≥28 MPa) to generate cavitation in the target tissue, guided by real-time ultrasound imaging guidance. The high cavitation threshold and reliance on real-time image guidance are potential limitations of histotripsy, particularly for the treatment of multifocal or metastatic cancers. To address these potential limitations, we have recently developed nanoparticle-mediated histotripsy (NMH) where perfluorocarbon (PFC)-filled nanodroplets (NDs) with the size of ∼200 nm were used as cavitation nuclei for histotripsy, as they are able to significantly lower the cavitation threshold. However, although NDs were shown to be an effective histotripsy agent, they pose several issues. Their generation requires multistep synthesis, they lack long-term stability, and determination of PFC concentration in the treatment dose is not possible. In this study, PFC-filled nanocones (NCs) were developed as a new generation of histotripsy agents to address the mentioned limitations of NDs. The developed NCs represent an inclusion complex of methylated β-cyclodextrin as a water-soluble analog of β-cyclodextrin and perfluorohexane (PFH) as more effective PFC derivatives for histotripsy. Results showed that NCs are easy to produce, biocompatible, have a size <50 nm, and have a quantitative complexation that allows us to directly calculate the PFH amount in the used NC dose. Results further demonstrated that NCs embedded into tissue-mimicking phantoms generated histotripsy cavitation "bubble clouds" at a significantly lower transducer amplitude compared to control phantoms, demonstrating the ability of NCs to function as effective histotripsy agents for NMH.
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Affiliation(s)
- Tanzeel
Ur Rehman
- Department
of Biomedical Engineering, School of Engineering and Natural
Sciences, and Regenerative and Restorative Medicine Research Center (REMER), Istanbul Medipol University, Istanbul 34810, Turkey
| | - Jennifer Khirallah
- Department
of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg 24061, United States
| | - Erhan Demirel
- Department
of Biomedical Engineering, School of Engineering and Natural
Sciences, and Regenerative and Restorative Medicine Research Center (REMER), Istanbul Medipol University, Istanbul 34810, Turkey
| | - Justin Howell
- Department
of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg 24061, United States
| | - Eli Vlaisavljevich
- Department
of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg 24061, United States
- E-mail: (E.V.)
| | - Yasemin Yuksel Durmaz
- Department
of Biomedical Engineering, School of Engineering and Natural
Sciences, and Regenerative and Restorative Medicine Research Center (REMER), Istanbul Medipol University, Istanbul 34810, Turkey
- E-mail: (Y.Y.D.)
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Shou K, Hong JK, Wood ES, Hook JM, Nelson A, Yin Y, Andersson GG, Abate A, Steiner U, Neto C. Ultralow surface energy self-assembled monolayers of iodo-perfluorinated alkanes on silica driven by halogen bonding. NANOSCALE 2019; 11:2401-2411. [PMID: 30667012 DOI: 10.1039/c8nr08195f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Compact self-assembled monolayers (SAMs) of perfluorododecyl iodide (I-PFC12) of reproducible thickness (1.2 nm) are shown to form on silicon wafers. The SAMs have a high fluorine content (95%) and convey an extremely low surface energy to the silicon wafers (4.3 mN m-1), lower than previously reported in the literature for perfluorinated monolayers, and stable for over eight weeks. Shorter chain iodo-perfluorinated (I-PFC8) or bromo-perfluorinated molecules (Br-PFC10) led to less dense layers. The monolayers are stable to heating up to 60 °C, with some loss up to 150 °C. The I-PFC12 monolayer increases the work function of silicon wafers from 3.6 V to 4.4 eV, a factor that could be gainfully used in photovoltaic applications. The I-PFC12 monolayers can be transferred into patterns onto silica substrates by micro-contact printing. The NMR data and the reproducible thickness point to an upright halogen bonding interaction between the iodine in I-PFC12 and the surface oxygen on the native silica layer.
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Affiliation(s)
- Keyun Shou
- School of Chemistry and University of Sydney Nano Institute, The University of Sydney, NSW 2006, Australia.
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Tan TTY, Ahsan A, Reithofer MR, Tay SW, Tan SY, Hor TSA, Chin JM, Chew BKJ, Wang X. Photoresponsive liquid marbles and dry water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3448-3454. [PMID: 24617527 DOI: 10.1021/la500646r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Stimuli-responsive liquid marbles for controlled release typically rely on organic moieties that require lengthy syntheses. We report herein a facile, one-step synthesis of hydrophobic and oleophobic TiO2 nanoparticles that display photoresponsive wettability. Water liquid marbles stabilized by these photoresponsive TiO2 particles were found to be stable when shielded from ultraviolet (UV) radiation; however, they quickly collapsed after being irradiated with 302 nm UV light. Oil- and organic-solvent-based liquid marbles could also be fabricated using oleophobic TiO2 nanoparticles and show similar UV-induced collapse. Finally, we demonstrated the formation of the micronized form of water liquid marbles, also known as dry water, by homogenization of the TiO2 nanoparticles with water. The TiO2 dry water displayed a similar photoresponse, whereby the micronized liquid marbles collapsed after irradiation and the dry water turned from a free-flowing powder to a paste. Hence, by exploiting the photoresponsive wettability of TiO2, we fabricated liquid marbles and dry water that display photoresponse and studied the conditions required for their collapse.
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Affiliation(s)
- Tristan Tsai Yuan Tan
- Institute of Materials Research and Engineering , 3 Research Link, Singapore 117602, Singapore
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Karoyo AH, Sidhu P, Wilson LD, Hazendonk P. Characterization and dynamic properties for the solid inclusion complexes of β-cyclodextrin and perfluorooctanoic acid. J Phys Chem B 2013; 117:8269-82. [PMID: 23713518 DOI: 10.1021/jp402559n] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The structural characterization and dynamic properties of solid-state inclusion complexes (ICs) formed between β-cyclodextrin (β-CD; host) and perfluorooctanoic acid (PFOA; guest) were investigated using (13)C NMR spectroscopy. The 1:1 and 2:1 host/guest solid-state complexes were prepared using a modified dissolution method to obtain complexes with high phase purity. These complexes were further characterized using differential scanning calorimetry (DSC), FT-IR spectroscopy, powder X-ray diffraction (PXRD), (19)F directpolarization (DP), and (13)C cross-polarization (CP) with magic-angle spinning (MAS) NMR spectroscopy. The (19)F → (13)C CP results provided unequivocal support for the formation of well-defined inclusion compounds. The phase purity of the complexes formed between β-CD and PFOA were assessed using the (19)F DP NMR technique at variable temperature (VT) and MAS at 20 kHz. The complexes were found to be of high phase purity when prepared in accordance with the modified dissolution method. The motional dynamics of the guest in the solid complexes were assessed using T1/T2/T1ρ relaxation NMR methods at ambient and VT conditions. The relaxation data revealed reliable and variable guest dynamics for the 1:1 versus 2:1 complexes at the VTs investigated. The motional dynamics of the guest molecules involve an ensemble of axial motions of the whole chain and 120° rotational jumps of the methyl (CF3) group at the termini of the perfluorocarbon chain. The axial and rotational dynamics of the guest in the 1:1 and 2:1 complexes differ in distribution and magnitude in accordance with the binding geometry of the guest within the host.
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Affiliation(s)
- Abdalla H Karoyo
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
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Li X, Zhang P, Jin L, Shao T, Li Z, Cao J. Efficient photocatalytic decomposition of perfluorooctanoic acid by indium oxide and its mechanism. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:5528-5534. [PMID: 22489882 DOI: 10.1021/es204279u] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Perfluorooctanoic acid (C(7)F(15)COOH, PFOA) has increasingly attracted worldwide concerns due to its global occurrence and resistance to most conventional treatment processes. Though TiO(2)-based photocatalysis is strong enough to decompose most organics, it is not effective for PFOA decomposition. We first find that indium oxide (In(2)O(3)) possesses significant activity for PFOA decomposition under UV irradiation, with the rate constant about 8.4 times higher than that by TiO(2). The major intermediates of PFOA were C(2)-C(7) shorter-chain perfluorocarboxylic acids, implying that the reaction proceeded in a stepwise manner. By using diffuse reflectance infrared Fourier transform spectroscopy, (19)F magic angle spinning nuclear magnetic resonance, and electron spin resonance, we demonstrate that the terminal carboxylate group of PFOA molecule tightly coordinates to the In(2)O(3) surface in a bidentate or bridging configuration, which is beneficial for PFOA to be directly decomposed by photogenerated holes of In(2)O(3) under UV irradiation, while PFOA coordinates to TiO(2) in a monodentate mode, and photogenerated holes of TiO(2) preferentially transform to hydroxyl radicals, which are inert to react with PFOA. PFOA decomposition in wastewater was inhibited by bicarbonate and other organic matters; however, their adverse impacts can be mostly avoided via pH adjustment and ozone addition.
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Affiliation(s)
- Xiaoyun Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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Park TJ, Choi SS, Kim JS, Kim YA. Variable Temperature High-Resolution 19F MAS Solid-State NMR Characterization of Fluorocarbon Rubbers. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.7.2345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Karoyo AH, Borisov AS, Wilson LD, Hazendonk P. Formation of Host-Guest Complexes of β-Cyclodextrin and Perfluorooctanoic Acid. J Phys Chem B 2011; 115:9511-27. [DOI: 10.1021/jp110806k] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abdalla H. Karoyo
- University of Saskatchewan, Department of Chemistry, Saskatoon, SK, S7N 5C9, Canada
| | - Alex S. Borisov
- University of Lethbridge, Department of Chemistry and Biochemistry, Lethbridge, AB, Canada
| | - Lee D. Wilson
- University of Saskatchewan, Department of Chemistry, Saskatoon, SK, S7N 5C9, Canada
| | - Paul Hazendonk
- University of Lethbridge, Department of Chemistry and Biochemistry, Lethbridge, AB, Canada
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Lee YJ, Clark CG, Graf R, Wagner M, Müllen K, Spiess HW. Solid-State Organization of Semifluorinated Alkanes Probed by 19F MAS NMR Spectroscopy. J Phys Chem B 2009; 113:1360-6. [DOI: 10.1021/jp808406e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Young Joo Lee
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Christopher G. Clark
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Robert Graf
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Manfred Wagner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Klaus Müllen
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Hans Wolfgang Spiess
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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O'Donnell A, Yach K, Reven L. Particle-particle interactions and chain dynamics of fluorocarbon and hydrocarbon functionalized ZrO2 nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:2465-2471. [PMID: 18269295 DOI: 10.1021/la702503m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The chain conformation and dynamics of hydrocarbon and perfluorocarbon fatty acids adsorbed on 4 nm ZrO2 particles were characterized by solid-state 13C chemical shift and 19F NMR relaxation measurements, respectively, and compared to those from previous studies on lower surface area fumed metal oxide powders. The interdigitation of chains between neighboring particles, which increases with chain length, can be detected from the splitting of the 13C NMR and 19F NMR signals of the CH3 and CF3 groups, respectively. Similar to the case of alkanethiol self-assembled monolayers (SAMs) on gold nanoparticles, this interdigitation allows for efficient chain packing despite the high surface curvature. The hydrocarbon chains on the ZrO2 nanoparticles are more ordered, and the reversible chain length dependent order-disorder transition temperatures are elevated relative to those of the same fatty acids adsorbed on fumed ZrO2 powder. Likewise, the 19F spin lattice relaxation times of the fluorocarbon chains approach those of the bulk acids with increasing chain length and interdigitation, indicating densely packed chains.
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Affiliation(s)
- Andrew O'Donnell
- Centre for Self-Assembled Chemical Structures (CSACS), Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6
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Cho CP, Tao YT. Tuning of metal work function with organic carboxylates and its application in top-emitting electroluminescent devices. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7090-5. [PMID: 17521210 DOI: 10.1021/la700648z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
By fine-tuning of work functions and thus the hole-injection properties of Ag and Al anodes, an electroluminescent device was achieved by using various self-assembled monolayers of organic carboxylate on the electrode surfaces. The IR spectra evidenced different binding behaviors of the carboxylates on Ag and Al. A correlation between the change in work function with the effective dipole moment along the surface normal and the currents in the hole-only devices was observed. These self-assembled-monolayer-modified metals were used as anodes in the fabrication of top-emitting organic light-emitting diodes (TOLEDs). The TOLED with the Ag anode modified by the perfluoroalkanoate exhibited a luminous efficiency as high as 18 cdA(-1), superior to that of the Ag2O-based device. With Al as the anode, the highest luminous efficiency was merely 6 cdA(-1) and decayed rapidly. The poorer EL property and performance of Al-based TOLEDs could be attributed to the weaker ionic bindings of carboxylates on Al and the weaker microcavity effect resulting from the inferior reflectivity of Al as compared to Ag.
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Affiliation(s)
- Chun-Pei Cho
- Institute of Chemistry, Academia Sinica, Taipei, 11529 Taiwan, Republic of China
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11
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Quiñones R, Raman A, Gawalt ES. An approach to differentiating between multi- and monolayers using MALDI-TOF MS. SURF INTERFACE ANAL 2007. [DOI: 10.1002/sia.2561] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Nordstierna L, Furó I, Stilbs P. Mixed adsorption of fluorinated and hydrogenated surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7969-74. [PMID: 16952229 DOI: 10.1021/la060757p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The adsorption isotherms of sodium perfluorooctanoate and sodium decyl sulfate and their 1:1 mixture on gamma-alumina are recorded by depletion-type experiments with (1)H and (19)F NMR spectroscopy as the detection tool. The isotherms of the different surfactant species, obtained with and without added salt, closely resemble each other. Salt addition changes the isotherms from stepwise to the familiar S-shaped. After having reached saturation, a further increase of surfactant concentration in the mixed system leads to decyl sulfate desorption and increased perfluorooctanoate adsorption. The (19)F chemical shift of adsorbed perfluorooctanoate suggests that, for saturated surfaces, the two sorts of adsorbed surfactants form molecularly mixed surface aggregates.
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Affiliation(s)
- Lars Nordstierna
- Division of Physical Chemistry and Industrial NMR Center, Department of Chemistry, Royal Institute of Technology, SE-10044 Stockholm, Sweden
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Cameron NS, Ott A, Roberge H, Veres T. Chemical force microscopy for hot-embossing lithography release layer characterization. SOFT MATTER 2006; 2:553-557. [PMID: 32680233 DOI: 10.1039/b600936k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We employed variable temperature chemical force microscopy (VT-CFM) using tips silanized with four different hydro- and hydrofluoroalkyl self-assembling monolayers (SAMs) interacting with a thin-film of poly(cyclic olefin), (PCO) to model the hot-embossing stamp-polymer interaction over a temperature range spanning the glass transition of the PCO.
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Affiliation(s)
- Neil S Cameron
- Industrial Materials Institute: National Research Council Canada, 75 Blvd. de Mortagne, Boucherville, Québec, J4B 6Y4, Canada.
| | - Arnaud Ott
- Industrial Materials Institute: National Research Council Canada, 75 Blvd. de Mortagne, Boucherville, Québec, J4B 6Y4, Canada.
| | - Hélène Roberge
- Industrial Materials Institute: National Research Council Canada, 75 Blvd. de Mortagne, Boucherville, Québec, J4B 6Y4, Canada.
| | - Teodor Veres
- Industrial Materials Institute: National Research Council Canada, 75 Blvd. de Mortagne, Boucherville, Québec, J4B 6Y4, Canada.
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