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Lee KK, Deng S, Fan HM, Mhaisalkar S, Tan HR, Tok ES, Loh KP, Chin WS, Sow CH. α-Fe2O3 nanotubes-reduced graphene oxide composites as synergistic electrochemical capacitor materials. Nanoscale 2012; 4:2958-61. [PMID: 22441701 DOI: 10.1039/c2nr11902a] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We present a facile approach for the fabrication of a nanocomposite comprising α-Fe(2)O(3) nanotubes (NTs) anchored on reduced graphene oxide (rGO) for electrochemical capacitors (ECs). The hollow tubular structure of the α-Fe(2)O(3) NTs presents a high surface area for reaction, while the incorporation of rGO provides an efficient two-dimensional conductive pathway to allow fast, reversible redox reaction. As a result, the nanocomposite materials exhibit a specific capacitance which is remarkably higher (~7 times) than α-Fe(2)O(3) NTs alone. In addition, the nanocomposites show excellent cycling life and large negative potential window. These findings suggest that such nanocomposites are a promising candidate as negative electrodes in asymmetrical capacitors with neutral electrolytes.
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Affiliation(s)
- K K Lee
- NUS Nanoscience and Nanotechnology Initiative, Block S13, 2 Science Drive 3, Singapore 117542
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Abstract
Dodecanethiol-protected copper/silver bimetallic nanoclusters were prepared by a liquid-phase method using different copper to silver feed ratios. The morphology and size of the prepared nanoclusters were analyzed with X-ray diffraction (XRD) and transmission electron microscopy (TEM), while their spectroscopic and surface properties were characterized by infrared (IR) and X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and 13C cross-polarization magic angle spinning NMR (13C CPMAS NMR). TEM analysis indicated that all the bimetallic clusters prepared are approximately 4-6 nm in size. On the other hand, the results of XRD, XPS, and Fourier transform infrared (FTIR) spectroscopy suggested that the surfaces of the alloy nanoclusters are mostly enriched with the less noble metal copper atoms. This surface enrichment of copper may be attributed to a galvanic exchange process during preparation, and the extent of enrichment is directly related to the copper feed ratio used. Interestingly, DSC studies showed two melting transitions in some of these alloy samples, suggesting different packing behavior of the dodecanethiol chains onto the heterogeneously intercalated silver- and copper-rich surfaces.
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Affiliation(s)
- T P Ang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Affiliation(s)
- Z. H. Zhang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 11753, Singapore
| | - W. S. Chin
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 11753, Singapore
| | - J. J. Vittal
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 11753, Singapore
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Affiliation(s)
- W. P. Lim
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, and Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
| | - H. Y. Low
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, and Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
| | - W. S. Chin
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, and Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
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Affiliation(s)
- T. P. Ang
- Department of Chemistry, National University of Singapore, 3, Science Drive 3, Singapore 117543, and Department of Physics, National University of Singapore, 2, Science Drive 3, Singapore 117542
| | - T. S. A. Wee
- Department of Chemistry, National University of Singapore, 3, Science Drive 3, Singapore 117543, and Department of Physics, National University of Singapore, 2, Science Drive 3, Singapore 117542
| | - W. S. Chin
- Department of Chemistry, National University of Singapore, 3, Science Drive 3, Singapore 117543, and Department of Physics, National University of Singapore, 2, Science Drive 3, Singapore 117542
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Lee YC, McGrath GB, Chin WS, Light RW. Contralateral tension pneumothorax following unilateral chest tube drainage of bilateral pneumothoraces in a heart-lung transplant patient. Chest 1999; 116:1131-3. [PMID: 10531187 DOI: 10.1378/chest.116.4.1131] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Bilateral pneumothoraces can result from unilateral air leak after heart-lung transplantation. The recommended initial management of such patients is insertion of a unilateral chest tube. We report a patient who developed bilateral pneumothoraces after undergoing transbronchial biopsies 2 years after a heart-lung transplant. The unilateral chest tube failed to drain the contralateral pneumothorax and a tension pneumothorax developed. The advocated approach should be used with caution.
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Affiliation(s)
- Y C Lee
- Department of Respiratory Medicine, Sir Charles Gairdner Hospital, Perth, Australia
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Affiliation(s)
- Y. Cao
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
| | - X. M. Wei
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
| | - W. S. Chin
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
| | - Y. H. Lai
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
| | - J. F. Deng
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
| | - S. L. Bernasek
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
| | - G. Q. Xu
- Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore 119260; Department of Chemistry, Fudan University, Shanghai, 200433, P.R.C.; and Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009
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Abstract
OBJECTIVE To report the first human case of autochthonous melioidosis in temperate Australia (latitude 31 degrees 10'S) and to describe the extent of the presence of the causative agent, Pseudomonas pseudomallei, in southwest Western Australia. CLINICAL FEATURES A 45-year-old man living on a hobby farm was admitted to hospital for investigation of lung lesions, weight loss and low grade fevers. P. pseudomallei was cultured from material from an aspiration biopsy of a mediastinal mass. INTERVENTION AND OUTCOME The patient was successfully treated with a regimen of ceftazidime and trimethoprim-sulfamethoxazole. A review of epidemiological data showed that, since 1967, P. pseudomallei has been cultured from animals and soil in a region 50-250 km north-west of Perth, Western Australia, and that pockets of endemicity are found in the districts of Toodyay (where our patient's farm was), Chittering, Ballidu, Gidgegannup, Badgingarra, and Wongan Hills. CONCLUSION The persistence of the bacterium in animals and soil in south-west Western Australia demonstrates abundantly that P. pseudomallei can exist opportunely beyond its traditional tropical habitat. It is likely that there will be further clinical cases of melioidosis originating in this region, and that the boundaries of endemicity in Australia will expand further.
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Chin WS, LiPuma JP. MRI looks at the kidney. Contemp Urol 1991; 3:63-8; 73; 76-8. [PMID: 10148068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- W S Chin
- University Hospitals of Cleveland
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Chin WS, Mok CY, Huang HH. THERMAL DECOMPOSITION OF 1-NITROPROPANE AND N-PROPYL NITRITE - ANALYSIS OF PRODUCT BY PHOTOELECTRON SPECTROSCOPY. Anal Chem 1990. [DOI: 10.1142/9789814434508_0020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Chin WS, Sng I. The Chiba needle for percutaneous lung biopsy. Singapore Med J 1988; 29:371-3. [PMID: 3249965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Chin WS, Rajendra Pillai SS. The Cardiovascular Laboratory at the Mount Elizabeth Hospital: the first 600 cases. Singapore Med J 1986; 27:413-5. [PMID: 2950594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Chin WS. The plain film diagnosis of combined right middle and lower lobe collapse. Singapore Med J 1984; 25:428-31. [PMID: 6531700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Chin WS. Computed tomography of hepatic cavernous hemangioma. Singapore Med J 1984; 25:168-72. [PMID: 6484586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Chin WS, Sng I. Percutaneous aspiration lung biopsy. Ann Acad Med Singap 1981; 10:376-82. [PMID: 7332306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Percutaneous needle aspiration lung biopsy is reviewed. Its method and place in the investigation of lung lesions is described and re-emphasized. It is a safe, cheap, quick and simple way to achieve a definitive diagnosis. The diagnostic accuracy is high and the complication rate low. The paper strongly advocates wider usage of this very useful investigative modality.
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Abstract
"The Japanese disease" or ossification of the posterior longitudinal ligament of the cervical spine was initially thought to affect only the Japanese people. Non-Japanese Asian and Caucasian cases have been reported but appear to be exceedingly rare. The reason is unknown. Although the disease appears to be generally benign, it can cause a myelopathy. We present here 16 non-Japanese patients in Singapore who were found to have ossification of the posterior longitudinal ligament in the cervical, thoracic and lumbar spine.
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Abstract
The chest radiographs of 25 patients with proven antiglomerular basement membrane antibody disease (Goodpasture's syndrome) were analysed. All except two of the patients had pulmonary haemorrhage at some stage of their disease. Altogether there were 39 episodes of pulmonary haemorrhage, 25 being relapses. During seven episodes the chest radiograph was normal. Relapses of pulmonary haemorrhage never occurred in isolation but were usually associated with infection (not necessarily a chest infection) or occasionally fluid overload. Conversely fluid overload or infection were always associated with pulmonary haemorrhage provided there were high or rising titres of circulating antibodies at the time. Therefore in a patient with antiglomerular basement membrane antibody disease, the presence of shadowing in the lung fields on the chest radiograph almost invariably means the patient has pulmonary haemorrhage whether or not pulmonary oedema or a chest infection are present. Limitation of shadowing by a fissure, loss of major portions of the diaphragmatic or cardiac silhouette, involvement of the lung apex or costophrenic angles suggest an underlying chest infection. Septal lines suggest fluid overload. Pleural effusions are seen with chest infections and fluid overload. The carbon monoxide uptake (KCO) was invariably high in the presence of pulmonary haemorrhage even if the chest radiograph was normal. A combined use of KCO and chest radiographs is the best method of monitoring lung disease in these patients.
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Abstract
The fine gauge Chiba needle was evaluated in percutaneous aspiration biopsy in 20 patients with suspected malignant lung neoplasm. Adequate aspirate can be obtained with one biopsy. A confident cytological diagnosis of malignancy was made in 19 out of 20 patients. Most of the patients were elderly. Nine patients developed pneumothoraces which were small and asymptomatic. The needle is easy to handle and very acceptable to patients. This needle therefore appears to be very suitable for percutaneous aspiration biopsy of lung neoplasms and possibly other non-neoplastic lesions too. It promises to supersede the larger aspiration needles currently in use.
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Chin WS. Interstitial gastric and duodenal emphysema. J Can Assoc Radiol 1978; 29:136-7. [PMID: 659484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A 31-year-old woman developed combined interstitial gastric and duodenal emphysema associated with acute dilatation of the stomach and duodenum following an asthmatic attack. The literature is reviewed.
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